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Installation and Maintenance Manual
OM 1149-2
Group: WSHP
Document PN: 910154675
Date: July 2014
MicroTech® IIISmartSource™ Unit Controller with I/O
Expansion Module for Single and Two Stage Water
Source Heat Pumps
Models GS
Models GT
I/O Expansion Module
MicroTech III SmartSource Unit Controller
People and ideas you can trust.™
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Fan Speed Selector Switch . . . . . . . . . . . . . . . . . . . . 20
MicroTech III Unit Controller . . . . . . . . . . . . . . . . . . . . 4
Fan Performance – Constant CFM Type ECM Motor 21
Control Boards Terminals and Connectors
Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
I/O Expansion Module Faults and Fan Operating
Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
I/O Expansion Module . . . . . . . . . . . . . . . . . . . . . . . . 5
Unit Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
BACnet Communication Module . . . . . . . . . . . . . . . . 5
Waterside Economizer . . . . . . . . . . . . . . . . . . . . . . . 23
LonWorks Communication Module . . . . . . . . . . . . . 5
SmartSource Dehumidification . . . . . . . . . . . . . . . . . 23
MicroTech III Unit Controller & I/O Expansion Module
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hot Gas Reheat Smart Dehumidification . . . . . . . . . 23
Replacing a MicroTech III Circuit Board: . . . . . . . . . . 7
Humidistat Controlled Dehumidification . . . . . . . . . . 25
Simplified Dehumidification . . . . . . . . . . . . . . . . . . . 24
Initial Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pre start check list: . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Use and Information . . . . . . . . . . . . . . . . . . . 8
Dehumidification Only . . . . . . . . . . . . . . . . . . . . . . . 26
Appendix B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
MicroTech III Unit Controller with LonWorks®
Communication Module . . . . . . . . . . . . . . . . . . . . . . 27
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Control Inputs (HP, LP, SLTS, COF, U, E, O) . . . . . . 10
Control Outputs {A and IV/PR (H8)} . . . . . . . . . . . . . 10
Unoccupied Operation – Stand Alone Thermostat
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
MicroTech III Controller with an Optional BACnet®
Communication Module . . . . . . . . . . . . . . . . . . . . . . 28
Typical Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . 29
115V, 1Ph – Model WGS, MicroTech III SmartSource
Unit Controller with BACnet Communication Module
(Hot Gas Reheat) (See page 30 for Service &
Disconnect Wiring) . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Thermostat Inputs (G, Y1, Y2, W1, and W2) . . . . . . . 11
Additional Fault Modes . . . . . . . . . . . . . . . . . . . . . . . 12
Brownout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
265V, 1Ph – Model WGS-WGT, MicroTech
III SmartSource Unit Controller with BACnet
Communication Module (Hot Gas Reheat) (See page
32 for Service & Disconnect Wiring) . . . . . . . . . . . . 31
Remote Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . 12
High / Low Pressure Faults (HP/LP) . . . . . . . . . . . . 13
Low Suction Temperature Fault Heating . . . . . . . . . 13
208-230V, 1Ph – Model WGS-WGT, MicroTech
III SmartSource Unit Controller with BACnet
Communication Module (Waterside Economizer,
Desuperheater, 115V Loop Pumps & 20kW Electric
Heat) (See page 34 for Service & Disconnect Wiring) . 33
Low Suction Temperature Fault Cooling . . . . . . . . . 13
Condensate Overflow . . . . . . . . . . . . . . . . . . . . . . . . 14
Fan Operation During Most Modes, Faults and
Shutdowns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Faults and Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
208-230V, 3Ph – Model WGS-WGT, MicroTech
III SmartSource Unit Controller with BACnet
Communication Module (Waterside Economizer, 230V
Loop Pumps & 5kW Electric Heat) (See page 36 for
Service & Disconnect Wiring) . . . . . . . . . . . . . . . . . . 35
Troubleshooting the Water Source Heat Pump Unit 17
Microtech® III Unit Controller Interface to External
Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
460V, 3Ph – Model WGS-WGT, MicroTech
III SmartSource Unit Controller with BACnet
Communication Module (Waterside Economizer, 230V
Loop Pumps & 20kW Electric Heat) (See page 38 for
Service & Disconnect Wiring) . . . . . . . . . . . . . . . . . . 37
Operation and Maintenance of I/O Expansion
Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Initial Power up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Thermostat Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Appendix C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Controller Comparison . . . . . . . . . . . . . . . . . . . . . . . 39
Electric Heat Controls . . . . . . . . . . . . . . . . . . . . . . . . 19
Supplemental Electric Heat Control . . . . . . . . . . . . . 19
Boilerless Heat Control . . . . . . . . . . . . . . . . . . . . . . 20
Compressor Heating Source Selection . . . . . . . . . . 20
Hydronic Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
OM 1149-2
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Introduction
This installation and operation manual covers the
MicroTech® III unit controller for Daikin G-Series Water
Source Heat Pumps. For information on LonWorks® or
BACnet® communication modules and other ancillary
components, see:
■■ IM 952 - Multiple Unit Control Panel (MUCP) for use
with MicroTech III Unit Controller and Mark IV Unit
Controller.
■■ IM 955 - MicroTech III Water Source Heat Pump
Wall-Mounted Room Temperature Sensors.
■■ IM 956 - Temperature Sensors for Units with
MicroTech III Unit Controller and LonWorks
Communication Module.
■■ IM 927 - MicroTech III Water Source Heat Pump
LonWorks Communication Module.
■■ IM 928 - MicroTech III Water Source Heat Pump Unit
Controller BACnet MS/TP Communication Module.
■■ IM 933 - LonWorks Plug-In Software for use
with MicroTech III Unit Controller - LonWorks
Communication Module.
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OM 1149-2
MicroTech III Unit Controller
Control Boards Terminals and
Connectors Descriptions
Table 1: MicroTech III Unit Controller Terminals &
Descriptions
H1 – 1
24
24 VAC Power Input
H7 – 2
No Connection
H1 – 2
C
24 VAC common
H7 – 3
Red LED Output
H2 – 1
SL1
Fan Main Required Output – Switched L1
H7 – 4
Green LED Output
Blank Terminal
H7 – 5
Yellow LED Output
Fan Main Required Output – Neutral
H7 – 6
H2 – 2
H2 – 3
N
H3 – 1
HP1-1
Comp High Pressure Switch (HP1) Input Terminal 1
H8 – 1
H3 – 2
HP1-2
Comp High Pressure Switch (HP1) Input Terminal 2
H8 – 2
Isolation Valve/Pump Request Relay N/C
H4 – 1
1
Discharge Air Temp Sensor – Common
H8 – 3
24 VAC Common
H4 – 2
Discharge Air Temp Sensor – Signal
H9 – 1
H4 – 3
Leaving Water Temp Sensor – Common
H9 – 2
H4 – 4
Leaving Water Temp Sensor – Signal
TB1 – 1
1
Room Sensor – Status LED Output
TB1 – 2
2
Room Sensor – Fan Mode & Unit Mode Switches
H5 – 2
TB1 – 3
3
Room Sensor – Setpoint Adjust Potentiometer
H5 – 3
TB1 – 4
4
Room Sensor – Room Temp Sensor & Tenant Override
H5 – 4
TB1 – 5
5
Room Sensor – DC Signal Common
H5 – 5
TB2 – 1
R
24 VAC
H5 – 6
TB2 – 2
A
Thermostat – Alarm Output
TB2 – 3
W2
Thermostat – Heat Stage #2 (W2) Input
H5 – 8
TB2 – 4
W1
Thermostat – Heat Stage #1 (W1) Input
H5 – 9
TB2 – 5
Y2
Thermostat – Cool Stage #2 (Y2) Input
H5 – 10
TB2 – 6
Y1
Thermostat – Cool Stage #1 (Y1) Input
H5 – 11
TB2 – 7
G
Thermostat – Fan Input
H5 – 1
1
Connections to I/O Expansion Board
H5 – 7
H5 – 12
Red-Green-Yellow LED Common
1
1
Isolation Valve/Pump Request Relay N/O
Room Temp Sensor & Tenant Override – Signal
Room Temp Sensor & Tenant Override – Common
TB2 – 8
O
Thermostat – Heat Stage #3 (W3) Input
Condensate Overflow Signal Input
TB2 – 9
C
24 VAC Common
H6 – 2
Compressor Suction Temp Sensor (LT1) – Common
TB3 – 1
E
Emergency Shutdown Input
H6 – 3
Compressor Suction Temp Sensor (LT1) – Signal
TB3 – 2
U
Unoccupied Input
H6 – 4
Compressor Low Pressure Switch (LP1) – Source Voltage
L1 – 1
L1 - 1
Line Voltage Terminal 1
H6 – 5
Compressor Low Pressure Switch (LP1) – Signal
L1 – 2
L1 - 2
Line Voltage Terminal 2
H6 – 6
Reversing Valve – Common
L1 – 3
L1 - 3
Line Voltage Terminal 3
H6 – 7
Reversing Valve – Output
N1
N1
Neutral Terminal 1
No Connection
N2
N2
Neutral Terminal 2
N3
N3
Neutral Terminal 3
H6 – 1
H7 – 1
1
1
OM 1149-2
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MicroTech III Unit Controller
I/O Expansion Module
BACnet Communication Module
Table 2: I/O Expansion Module Connectors/Terminals
Table 3: BACnet Communication Module Connectors/
Terminals
H1 – 1
1
H1 – 2
P4 – 1
H1 – 3
P4 – 2
+ 5 VDC
H1 – 4
P4 – 3
SPI SELECT (SPI Select To Communications Board)
H1 – 5
P4 – 4
SPI CLK (Master Clock)
H1 – 6
P4 – 5
SPI RCV (MOSI)
P4 – 6
SPI XMIT (MISO)
H1 – 8
P4 – 7
SRDY OUT (SPI Ready To Baseboard)
H1 – 9
P4 – 8
H1 – 10
P3 – 1
H1 – 11
P3 – 2
Network Signal –
H1 – 12
P3 – 3
REF
P3 – 4
Shield
Connections to Main Board
H1 – 7
H2 – 1
1
H2 – 2
24 VAC Common
1
Ext. 24 VAC Common In
H3 – 3
HGR / Waterside Economizer Output – N/O
H3 – 4
Ext. 24 VAC Common
H3 – 5
ECM Fan Motor Variable Speed Signal Output
H3 – 6
ECM Fan Motor Variable Speed Signal – Common
1
H4 – 2
H5 – 1
Network Signal +
Table 4: LON Communication Module Connectors/
Terminals
CN_SPI – 1
Entering Water Temp Sensor – Signal
Entering Water Temp Sensor – Common
1
No Connection
H5 – 2
No Connection
H5 – 3
Red LED Output
H5 – 4
Green LED Output
H5 – 5
Yellow LED Output
H5 – 6
Red-Green-Yellow LED Common
Fan Speed Table Row Select – Signal
H7 – 2
Fan Speed Table Row Select – Common
H7 – 3
Thermostat – Heat Stage #4 (W4) Input – Signal
H7 – 4
+ 5 VDC
CN_SPI – 3
SPI_SELECT1_0 (SPI Select To CommunicationsBoard)
CN_SPI – 4
SPI_CLK_0 (Master Clock)
CN_SPI – 5
SPI_RX_0 (MOSI)
CN_SPI – 6
SPI_TX_0 (MISO)
CN_SPI – 7
SREADY_0 (SPI Ready To Baseboard)
TB1 – 1
H6 – 2 HP2-2 Comp High Capacity High Press Sw (HP2) Input Terminal 2
H7 – 1
CN_SPI GND
CN_SPI – 2
CN_SPI – 8
H6 – 1 HP2-1 Comp High Capacity High Press Sw (HP2) Input Terminal 1
H8 – 1
No Connection
P3
LonWorks Communication Module
Ext. 24 VAC In
H3 – 2
H4 – 1
GND
No Connection
H2 – 3
H3 – 1
Auxiliary Heat Stage #2 Output – N/O
P4
No Connection
TB1
Network Signal A
TB1 – 2
Network Signal B
TB1 – 3
REF
Auxiliary 24 VAC Out
1
Compressor – High Capacity Output – N/O
H8 – 2
24 VAC Common
H8 – 3
No Connection
H8 – 4
Auxiliary Heat Stage #1 / Hydronic Heat Output N/O (24 VAC)
H8 – 5
24 VAC Common
TB1 – 1
1
Humidistat Signal Input
TB1 – 2
2
Thermostat - Heat Stage #4 (W4) Input – Signal
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5
OM 1149-2
MicroTech III Unit Controller
MicroTech III Unit Controller & I/O Expansion Module Connections
Figure 1: MicroTech III Unit Controller & I/O Expansion Module Connectors Descriptions
OM 1149-2
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MicroTech III Unit Controller
Initial Power-Up
CAUTION
Pre start check list:
The MicroTech III circuit board incorporates static sensitive
devices. A static charge from touching the device can damage the
electronic components. To help prevent damage during service,
use static discharge wrist straps.Static discharge wrist straps are
grounded to the heat pump chassis through a 1 Mohm resistor.
A random start delay time between 300 and 360 seconds
is generated at power up.
Figure 2: Location of Configuration Jumpers on the Base
Board Controller
Replacing a MicroTech III
Circuit Board:
1. Connect wrist strap to unit.
2. Remove faulty board and place on static protected
surface.
3. Remove replacement board from static protected
bag.
Note: Do not touch circuit board; hold by edges.
4. Holding board in grounded hand, install board in
unit.
5. Insert faulty board in empty static bag for return.
Table 5: I/O expansion module jumper settings
Jumper
Description
JP1
Mode
JP2
Fan operation
JP3
(See Warning)
Options
Open for normal operation mode
Shorted for service/test operation mode
Freeze Protection
JP4
Freeze Fault Protection
JP5
Set point adjustment range only applies to network controls with a room temperature sensor
JP6
Room control type
JP7
Compressor heating source
JP8
I/O expansion module
Open for continuous fan operation, when not in unoccupied mode.
Shorted for cycling fan operation
Open for water freeze protection
Shorted for systems with anti-freeze protection (15°F (9°C)
Open for none
Shorted to enable freeze fault protection based on Leaving Water Temperature (LWT)
Open for adjustment range of -5.0° to +5.0° F
Shorted for 55° to 95° F adjustment range
Open for thermostatic room control
Shorted for room temperature sensor control, MicroTech III only.
Open to enable compressor heating
Shorted to disable compressor heating
Open when I/O expansion module is not needed
Shorted when I/O expansion module is required
WARNING
Proper antifreeze/water solution is required to minimize the
potential of fluid freeze-up. Jumper JP3 is factory set for water
freeze protection with the jumper open. Operation at fluid
temperatures below 32°F with anti-freeze protection requires
JP3 to be field configured for the jumper closed. If unit is
employing a fresh water system (no anti-freeze protection), it is
extremely important that JP3 jumper setting remains in the open
position (factory default setting) in order to shut down the unit
at the appropriate water temperature to protect your heat pump
from freezing. Failure to do so can result in unit damage and
fluid leaks.”
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7
OM 1149-2
MicroTech III Unit Controller
General Use and Information
The Microtech III SmartSource unit controller is a water
source heat pump control platform used to control the
heat pump in all modes of operation, including variable
speed fans, two stage compressors, loop pumps,
economizers, reversing valves, and all components used
to control conditioned space temperature and humidity.
By adding communications cards, (LonWorks or BACnet)
network integration is possible. The controller can be used
with thermostat control or wall sensor control.
All MicroTech III unit controller inputs must be operated
by dry contacts powered by the control board’s power
terminals. No solid state devices (Triacs) may be used
to operate MicroTech III unit controller inputs. No outside
power sources may be used to operate MicroTech III.
All units must be properly grounded per local code
requirements. See the Installation and Maintenance
bulletin specific to your Water Source Heat Pump.
Occupied Operation
The board will be in occupied mode if the unoccupied
terminal (U) is not shorted to ground.
Board LED Status – Occupied
Yellow
Green
Red
Off
On
Off
Operating Modes
■■ Start-up – The unit will not operate until all the
inputs and safety controls are checked for normal
conditions.
■■ Cooling mode – On an initial call for cooling, the fan
will energize at its “fan only” setting, the pump request
will engergize, the 45 second proof of flow timer will
start, compressor minimum off, and random startup
timers are expired, the compressor and fan will
start at the stage 1 cooling settings. If room setpoint
conditions are not satisfied, the fan will operate at
the stage 2 cooling settings. When the room setpoint
conditions are satisfied, the compressor will shut off
and the fan will operate according to its “fan only”
setting when enabled for continuous fan operation. If
fan cycling is enabled, the fan will turn off once room
setpoint conditions are satisfied.
■■ Dehumidification modes – There are four
dehumidification modes of operation;
1. Smart Dehumidification with Hot Gas Reheat
2. Simplified Dehumidification
3. Humidistat Controlled Dehumidification
4. Dehumidification Only
See "SmartSource Dehumidification" on page 23 for
details.
OM 1149-2
■■ Smart Dehumidification – Uses hot gas reheat,
a humidistat, a 2-stage thermostat and air flow
management for precise humidity control. When the
cooling and heating temperature setpoint is satisfied
and there is a call for dehumidification, maximum
dehumidification is initiated by energizing the fan at
its “fan only” setting, energizing the pump request,
starting the 45 second proof-of-flow timer, energizing
the hot gas reheat solenoid valve, energizing the
compressor at maximum cooling, and energizing the
fan at the dehumidification setting. When the room
humidity conditions are satisfied, the compressor
will shut off and the fan will operate according to its
“fan only” setting when enabled for continuous fan
operation. If fan cycling is enabled, the fan will turn
off, once room humidity conditions are satisfied.
■■ Simplified Dehumidification – Uses a 3-stage
thermostat and air flow management to optimize unit
capacity and fan speed for maximum latent capacity
while decreasing room humidity levels. On a call for
cooling, the fan will energize at its “fan only” setting,
the pump request will energize, the 45 second flow
timer will start, after the flow, compressor minimum
off, and random startup timers are expired, the
compressor will start at stage 1 cooling and the fan
will energize at its dehumidification setting. If the
room setpoint temperature is still not satisfied, the
fan will be energized at the stage 1 cooling settings.
If the room setpoint temperature is still not satisfied,
the compressor and fan will operate at the stage
2 cooling settings. When the room temperature
conditions are satisfied, the compressor will shut off
and the fan will operate according to its “fan only”
setting when enabled for continuous fan operation. If
fan cycling is enabled, the fan will turn off, once room
setpoint conditions are satisfied.
■■ Humidistat Controlled Dehumidification – Uses a
humidistat and 2-stage thermostat to control room
humidity levels. On a call for dehumidification, the
fan will energize at its “fan only” setting, the pump
request will energize, the 45 second flow timer will
start, after the flow, compressor minimum off, and
random startup timers are expired, the compressor
will start at stage 1 cooling and the fan will energize
at its dehumidification setting. If the room setpoint
temperature is not satisfied, the fan will be energized
at the stage 1 cooling settings. If the room setpoint
temperature is still not satisfied, the compressor and
fan will operate at the stage 2 cooling settings. When
the room temperature and humidity conditions are
satisfied, the compressor will shut off and the fan
will operate according to its “fan only” setting when
enabled for continuous fan operation. If fan cycling
is enabled, the fan will turn off once room setpoint
conditions are satisfied.
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MicroTech III Unit Controller
■■ Dehumidification Only – Uses a humidistat in the
cooling only mode. On a call for dehumidification, the
fan will energize at its “fan only” setting, the pump
request will energize, the 45 second flow timer will
start, after the flow, compressor minimum off, and
random startup timers are expired, the compressor
will start at stage 1 cooling and the fan will energize
at its dehumidification setting. Room temperature
conditions are not monitored or maintained. The unit
only responds to a call for dehumidification. When the
room humidity conditions are satisfied, the compressor
will shut off and the fan will operate according to its
“fan only” setting when enabled for continuous fan
operation. If fan cycling is enabled, the fan will turn off
once room setpoint conditions are satisfied.
and the fan will operate at its electric heat setting. For
units equipped with 2 stages of electric heat, if room
setpoint conditions are still not satisfied, the second
stage of electric heat will be energized and the fan will
continue to operate at its electric heat setting. When
the room setpoint conditions are satisfied, electric
heat will be de-energized allowing the compressor
to remain on if necessary to maintain room setpoint
conditions. The fan will operate according to its
“fan only” setting when enabled, for continuous fan
operation. If fan cycling is enabled, the fan will turn off
once room setpoint conditions are satisfied.
■■ Primary Electric Heat mode – On an initial call for
heating, stage 1 electric heat will be energized and
the fan will start at its electric heat setting. For units
equipped with 2 stages of electric heat, if room
setpoint conditions are not satisfied, the second
stage of electric heat will be energized and the fan
will continue to operate at its electric heat setting.
When the room setpoint conditions are satisfied,
electric heat will be de-energized and the fan will
continue to operate at its “fan only” setting when
enabled, for continuous fan operation. If fan cycling
is enabled, the fan will turn off after 30 seconds once
room setpoint conditions are satisfied.
■■ Heating mode – On an initial call for heating, the
fan will energize at its "fan only" setting, the pump
request will energize, the 45 second flow timer will
start, after the flow, compressor minimum off, and
random startup timers are expired, the compressor
and fan will start at stage 1 heating settings; the
reversing valve shall energize 5 seconds after the
compressor turns on. If room setpoint conditions are
not satisfied, the fan will operate at stage 2 heating
settings. When the room setpoint conditions are
satisfied, the compressor will shut off and the fan
will operate according to its “fan only” setting when
enabled for continuous fan operation. If fan cycling
is enabled, the fan will turn off, once room setpoint
conditions are satisfied.
■■ Emergency Electric Heat mode – A 24v control signal
from the thermostat will initiate a call for stage 1 or
stage 2 electric heat. The compressor will not operate
and the fan will start at its electric heat setting.
■■ Hydronic Heat Mode – The hydronic heating option
provides control of a two position valve connected
to a hot water coil when loop water temperature
is warm enough for hydronic heating. Loop water
temperature is sensed by a factory installed entering
water temperature sensor located on the inlet water
line. Hydronic heat circuit shall be independent
and substitute the use of the compressor driven
refrigeration circuit. Hydronic heating set point allowed
range is 70°F to 158°F, with a 70°F default value.
■■ Boilerless Electric Heat mode – When the entering
water temperature is below setpoint, the compressor
will not be allowed to operate. On an initial call for
heating, stage 1 electric heat will be energized and
the fan will start at its electric heat setting. For units
equipped with 2 stages of electric heat, if room
setpoint conditions are not satisfied, the second
stage of electric heat will be energized and the fan
will continue to operate at its electric heat setting.
When the room setpoint conditions are satisfied,
electric heat will be de-energized and the fan will
continue to operate at its “fan only” setting when
enabled, for continuous fan operation. If fan cycling
is enabled, the fan will turn off after 30 seconds once
room setpoint conditions are satisfied.
■■ Occupied Mode – The MicroTech III SmartSource
unit controller will manage occupied and unoccupied
modes of operation. The occupancy mode
can be established by a BACnet or LonWorks
communication signal, from a room sensor equipped
with “Occupied/Unoccupied” mode functions, or a
thermostat equipped with an “Occupied/Unoccupied”
mode switch. When in the occupied mode, the unit
will be controlled to its occupied setpoint conditions.
The occupancy state will be displayed on sensors
equipped with “Occupied/Unoccupied” mode
functions and annunciation capabilities.
■■ Supplemental Electric Heat mode – On an initial
call for heating, the fan will energize at its “fan only”
setting, the pump request will energize, the 45
second flow timer will start. After the flow, compressor
minimum off, and random startup timers are expired,
the compressor and fan will start at stage 1 heating
settings; the reversing valve shall energize 5 seconds
after the compressor turns on. If room setpoint
conditions are not satisfied, the fan will operate at
stage 2 heating settings. If room setpoint conditions
are still not satisfied, the compressor will continue to
operate and stage 1 electric heat will be energized
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■■ Unoccupied Mode – When operating in the
unoccupied mode, the unit will be controlled to its
unoccupied setpoint conditions and the fan will cycle
according to a call for cooling, dehumidification or
heating. A simple “grounded” signal between
9
OM 1149-2
MicroTech III Unit Controller
■■ terminals U and C on the MicroTech III SmartSource
unit controller will place the unit into the unoccupied
mode for night setback operation. The occupancy
state will be displayed on sensors equipped with
“Occupied/Unoccupied” mode functions and
annunciation capabilities.
■■ Override Mode – A momentary (4 to 9 seconds)
press of the “Override” button on the thermostat
or room sensor during the unoccupied mode will
cause the unit to operate in the occupied mode
for two hours, for after-hours heating, cooling or
dehumidification. “OVERRIDE” will be displayed
on sensors equipped with override button and
annunciation capabilities.
■■ “Energy Save” Bypass Mode – BACnet or LonWorks
units can receive a signal from the Building
Automation System (BAS) to initiate the energy
savings mode. This mode is typically initiated by the
BAS with smart grid technologies to save energy.
The savings is driven by reducing peak electrical
demand for the building. Once initiated, the MicroTech
III SmartSource unit controller will reset its effective
setpoint to minimize the stage of compressor
operation. “E-SAVE” will be displayed on sensors
equipped with bypass mode annunciation capabilities.
■■ Motorized Water Valve or Pump Start – When there
is a call for cooling, dehumidification or heating, the
MicroTech III SmartSource unit controller will energize
its IV/PR (H8) terminal to open the motorized water
valve or start the loop pump 45 seconds prior to
starting the compressor. The IV/ PR (H8) terminal may
be “daisy chained” between 200 units.
Control Inputs (HP, LP, SLTS, COF,
U, E, O)
The control inputs are High Pressure (HP), Low
Pressure (LP), Suction Line Temperature Sensor (SLTS),
Condensate Overflow (COF), Unoccupied (U), and
Remote Shutdown (E). The control inputs are in normal
states during occupied mode. The state of each control
in occupied mode during normal operation is as follows:
■■ High Pressure (HP): Normally closed switch that opens
on a high refrigerant pressure condition. Control
will generate a high pressure fault and disables the
compressor output when the switch is open.
■■ Low Pressure (LP): Normally closed switch that
opens on a low refrigerant pressure condition.
Control will generate a low pressure fault when the
switch is open. Suction Line Temperature Sensor
(SLTS): temperature sensor on the suction line.
■■ Condensate Overflow (COF): senses condensate
level in condensate pan. Control will generate a fault
when condensate level is too high.
■■ Remote Shutdown (E): Grounding this terminal
forces the control to shutdown the unit.
Control Outputs {A and IV/PR (H8)}
The control outputs are Alarm Fault (A) and Isolation
Valve / Pump Request {IV/PR (H8)}. The operation of the
control outputs during occupied mode is as follows:
■■ The thermostat alarm output will be energized when there
are fault conditions presently active. Without any fault
conditions active, the alarm output shall be de-energized.
■■ Isolation Valve / Pump Request {IV/PR (H8)}: is
selectable to be energized when the compressor
is off (normally closed), or when the compressor is
on (normally open), by moving the wire lead to the
appropriate terminal.
Figure 3: H8 Terminals on MicroTech III Board
■■ Reversing Valve: 24V signal that is energized upon a
call for heat mode.
■■ Compressor Relay: Line or low voltage output used
to control compressor. (On/Off)
Fan Operation
The G terminal controls continuous fan operation. The
fan runs continuously when the G terminal is energized.
When the G terminal is de-energized, the fan cycles with
the compressor.
Cooling Mode
The Y1 terminal controls the Cooling Mode of operation. When
the Y1 terminal is energized (24VAC), the following occurs:
1. The fan energizes.
2. The IV/PR (H8) control output de-energizes or
energizes depending on the H8 terminal wiring
(refer to "MicroTech III Unit Controller Terminals &
Descriptions" on page 4 & "MicroTech III Unit
Controller & I/O Expansion Module Connectors
Descriptions" on page 6).
3. The compressor energizes after 45 seconds.
4. The reversing valve de-energizes 5 seconds after
the compressor turns on.
When the Y1 terminal is de-energized, the following occurs:
1. The compressor de-energizes.
■■ Unoccupied (U): Grounding this terminal puts the
control into unoccupied mode.
OM 1149-2
10www.DaikinApplied.com
MicroTech III Unit Controller
2. The IV/PR (H8) control output energizes or deenergizes depending on the H8 terminal wiring
(refer to "MicroTech III Unit Controller Terminals &
Descriptions" on page 4 & "MicroTech III Unit
Controller & I/O Expansion Module Connectors
Descriptions" on page 6).
3. The fan de-energizes, unless the G terminal is
energized (24VAC).
Note: To prevent compressor cycling and all compressors from starting up together after loss of power,
the required minimum on/off time default is 300
seconds. This may cause the compressor time
delay to be longer than indicated above.
Heating Mode
The W1 terminal controls the occupied Heating Mode
of operation. When the W1 terminal is energized, the
following occurs:
1. The fan energizes.
2. The IV/PR (H8) control output de-energizes or
energizes depending on the H8 terminal wiring
(refer to "MicroTech III Unit Controller Terminals &
Descriptions" on page 4 & "MicroTech III Unit
Controller & I/O Expansion Module Connectors
Descriptions" on page 6).
Note: To prevent compressor cycling, the required minimum on/off time default is 300 seconds. This may
cause the compressor time delay to be longer
than indicated above.
Unoccupied Operation – Stand
Alone Thermostat Control
The board will be in unoccupied mode if the unoccupied
terminal (U) is grounded.
Board LED Status – Unoccupied
Yellow
Green
Red
On
On
Off
Thermostat Inputs (G, Y1, Y2, W1,
and W2)
The only thermostat inputs used during unoccupied
operation are Y2 and W2, which when energized will
activate Cooling Mode or Heating Mode respectively.
Inputs G, Y1 and W1 have no effect during unoccupied
mode.
Figure 4: Terminal "U" - Grounded for Unoccupied
3. The compressor energizes after 45 seconds.
4. The reversing valve energizes 5 seconds after the
compressor turns on.
When the W1 terminal is de-energized, the following occurs:
1. The compressor de-energizes.
2. The IV/PR (H8) control output energizes or deenergizes depending on H8 terminal wiring (refer
to "MicroTech III Unit Controller Terminals &
Descriptions" on page 4 & "MicroTech III Unit
Controller & I/O Expansion Module Connectors
Descriptions" on page 6).
3. The fan de-energizes, unless the G terminal is
energized.
www.DaikinApplied.com11
OM 1149-2
MicroTech III Unit Controller
Additional Fault Modes
Figure 5: Terminal "E" - Grounded for Remote Shutdown
Brownout
Board LED Status – Brownout
Yellow
Green
Red
Off
Flash
Off
Brownout condition is provided to protect the water
source heat pump’s motor electrical damage due to low
voltage conditions.
The MicroTech III unit controller is designed to monitor
the 24VAC power supply to the board. If the line voltage
supplied to the water source heat pump drops, the 24VAC
supply to the control board will also drop. When the line
voltage supplied to the unit drops below approximately
80% of the unit nameplate rated value, the controller
goes into brownout condition. The controller remains
in brownout condition until line voltage returns to
approximately 90% of the unit nameplate value.
When in brownout condition, thermostat and control inputs
have no affect upon unit operation. Remote shutdown and
brownout conditions have the same level of priority. See
Table 8 on page 16.
When the unit is in brownout condition the following
occurs:
1. The compressor de-energizes.
2. The fan de-energizes.
3. Fault terminal (A) energizes (fault). A to R will be
used to indicate an alarm signal.
When in remote shutdown (E terminal grounded),
thermostat and control inputs have no affect upon unit
operation. No faults or modes have higher priority than
remote shutdown. Remote shutdown and brownout
condition have the same level of priority. See Table 8 on
page 16.
When the unit is in remote shutdown mode, the following
occurs:
1. The compressor de-energizes (if enabled).
2. The fan de-energizes (if enabled).
3. Fault terminal (A) will remain de-energizes because
emergency shutdown is a "mode". A to C will be
used to indicate normal operation.
When the E terminal is no longer grounded the unit will
automatically return to normal operation.
Note: The remote shutdown input (E) will suspend unit
operation. Disconnect power when servicing the
unit/controller.
When the line voltage supplied to the unit returns to
acceptable levels (~90% of nameplate) the controller
returns to the current mode.
Remote Shutdown
Board LED Status – Remote Shutdown
Yellow
Green
Red
Off
Flash
Off
When the E terminal is grounded, the MicroTech III
unit controller enters remote shutdown mode. Remote
shutdown is provided so that when properly connected
to a building automation system, remote switch, etc., the
E terminal can be used to shut down the water source
heat pump.
OM 1149-2
12www.DaikinApplied.com
MicroTech III Unit Controller
High / Low Pressure Faults (HP/LP)
Normally closed high and low refrigerant pressure
switches help protect the water source heat pump
from excessively high or low refrigerant pressures. The
MicroTech III unit controller monitors these switches
individually. If the compressor is running and the HP
circuit is open, the controller enters a pressure fault
mode. If the LP circuit is open after a time delay (default
of 30 seconds, adjustable if a communication module is
present) the controller enters a low pressure fault mode.
Board LED Status – High/Low Pressure Faults
Pressure
Yellow
Green
Red
HP
Off
Off
Flash
LP
Off
Off
Solid
See Table 8 on page 16.
When the unit is in high or low pressure fault modes the
following occurs:
1. The compressor de-energizes.
2. The IV/PR(H8) output will change state. (On to Off /
Off to On).
3. The fan de-energizes.
4. The fault terminal (A) energizes (fault). A to R will be
used to indicate an alarm signal.
High Pressure/Low Pressure Reset
After the HP circuit is closed, the unit does not return to
normal operation until the alarm is manually reset. The
unit is locked out in this manner until the unit can be
serviced.
The alarm is reset by a short interruption of unit power,
by holding down the tenant override button for more
than 10 seconds, or via the Building Automation System
(BAS).
Low Suction Temperature Fault
Heating
1. The control will attempt to recover from a low
suction temperature condition by defrosting water
heat exchanger (coaxial coil).
2. See the Defrost Process below for details.
Low Suction Temperature Fault
Cooling
1. When the suction line temperature falls below 28° F
disable the compressor output only.
2. The fan will continue to run drawing warmer air over
the air heat exchanger.
3. When the suction line temperature increases by
Low Temp Protect Diff (the default is 8° F) degrees.
4. The compressor is available for cooling if the
Compressor Minimum Off timer has expired.
5. Mark the occurrence of the fault.
Board LED Status – Low Suction Line Temperature Fault
Yellow
Green
Red
Flash
Off
Off
Defrost Sequence of Operation:
1. Immediately turn off the compressor if operating in
the cooling or dehumidification modes.
2. The reversing valve output is de-activated, placing
the reversing valve in the cooling mode and moving
warm refrigerant to the coax coil.
3. Fan speed is not changed, however “Heat Stage #1”
speed is used if the fan is presently off.
4. If the compressor was on at the beginning of the
defrost process, then start the 60 second fixed
defrost timer.
5. Wait for the defrost timer to expire.
6. If the alarm condition has cleared:
• Return to normal operation.
7. If the alarm condition remains active:
• Compressor High Capacity is turned off
• Compressor is immediately turned off, ignoring
the Compressor Minimum ON timer
• Compressor is disabled for heating and cooling
• Electric heating can be used if it is available
• Fan and pump remain available for operation
www.DaikinApplied.com13
OM 1149-2
MicroTech III Unit Controller
Heating Mode
When the suction line temperature falls below 28°F
on standard equipment (6.5°F on Geothermal) the low
temperature fault generates the following:
• The reversing valve de-energizes. The compressor
and fan continue to operate in cooling mode for
60 seconds, which results in a defrost mode. This
defrosts any ice that may have accumulated in
the water-to-refrigerant coil, because of a lack of
condenser water flow in heat mode.
• In heat mode the low temperature fault is subject to
Intelligent Reset.
• The fault terminal (A) energizes while the unit is
in defrost mode. It will stay energized until the
temperature recovers to 36°F for standard equipment
(14.5°F for geothermal). A to R will be used to
indicate an alarm signal. The previous operation of
heating or cooling determines how the low suction
temp alarm must be reset.
• The fan and pump remain available for operation.
Cooling Mode
When the suction line temperature falls below 28°F
standard equipment (28°F geothermal) in cool mode the:
• Compressor de-energizes.
• The fan and pump remain available for operation.
• Alarm output energizes.
• When the suction line temperature recovers to 36°F
standard equipment (14.5°F on geothermal) the low
temperature fault continues and the compressor will
be locked out.
Fan Only Mode
When the suction line temperature falls below 28°F
standard equipment (28°F geothermal) in cool mode the:
• The fan and pump remain available for operation.
• Alarm output energizes.
The previous operation of heating or cooling determines
how the low suction temp alarm must be reset.
OM 1149-2
Condensate Overflow
Board LED Status – Condensate Overflow
Yellow
Green
Red
On
Off
Off
The MicroTech III unit controller's condensate sensor is
designed to detect excessively high condensate water
levels in the drain pan. When high condensate water
levels are detected during cooling or dehumidification
modes, the controller enters into condensate fault
mode. The fan operates at fan only speed during the
condensate overflow fault mode.
Some faults and modes have higher priority than
condensate overflow mode. See Table 8 on page 16.
When the unit senses a condensate overflow fault while
in cooling mode the following occurs:
1. The compressor de-energizes.
2. The fault terminal (A) energizes (fault). A to R will be
used to indicate an alarm signal.
When condensate levels return to normal, the controller
will automatically return to normal operation.
Remote Reset of Automatic Lockouts
The Remote Reset feature provides the means to
remotely reset some lockouts generated by highpressure and/or low-temperature faults. When the
MicroTech III unit controller is locked out due to one of
these faults, and the cause of the fault condition has
been cleared, energizing the O-terminal for 11 seconds
or more forces the MicroTech III unit controller to clear
the lockout. Cycling unit power also clears a lockout if
the conditions causing the fault have been alleviated.
Intelligent Reset (See "Fault Recovery
and Reset" on page 15)
The Intelligent Reset feature helps to minimize nuisance
trips of automatic lockouts caused by low-temperature
faults. This feature clears faults the first two times they
occur within a 24-hour period and triggers an automatic
lockout on the 3rd fault. The retry count is reset to zero
every 24 hours.
14www.DaikinApplied.com
MicroTech III Unit Controller
Table 6: Fault Recovery and Reset
Auto Recovery
Tenant Override
Button Reset
Network Reset
IO Expansion Communication Fail
Yes
No
No
Invalid Jumper Configuration
No
No
No
Low Voltage Brownout
Yes
No
Yes
All Sensor Failures
No
No
Yes
Compressor High Pressure
No
Yes
Yes
Compressor Low Pressure
No
Yes
Yes
Compressor Low Suction Temp or Freeze Fault Detect (Heat & Cool)
Yes1
Yes
Yes
Compressor Low Suction Temp or Freeze Fault Detect (Dehumidification)
Yes
Yes
Yes
Condensate Overflow
Yes
No
Yes
Low Entering Water Temp.
Yes
No
No
EEPROM Corrupted
No
No
No
Waterside Economizer Low Temp. Cutout
Yes
No
No
Fault Description
Note:
1
Indicates auto recover is subject to intelligent alarm reset. Alarm auto recovers on first two occurrences,
locked out on third within 24 hour period. See “Intelligent Alarm Resetting” section on the previous page
for further details.
Tenant Override
Note: It is recommended that the "All MicroTech III unit
controller inputs must be operated by dry contacts powered by the control board’s power terminals. No solid state devices (Triacs) may be used
to operate MicroTech III unit controller inputs. No
outside power sources may be used to operate
MicroTech III. All units must be properly grounded
per local code requirements. See the Installation
and Maintenance bulletin specific to your Water
Source Heat Pump." and "Unoccupied Operation
– Stand Alone Thermostat Control" on page 11
section should be reviewed prior to this section.
www.DaikinApplied.com15
The MicroTech III unit controller enters tenant override
mode when the Tenant Override (TO) terminal is
grounded for 4-10 seconds during a period when the
Water Source Heat Pump is in unoccupied mode.
Tenant override allows a tenant, returning to the
controlled space after the unit has been placed in
unoccupied mode, to activate the tenant override input
and place the unit into occupied mode.
Any remote button or switch with momentary dry
contacts can be used for this purpose. During the 2-hour
tenant override period all the thermostat inputs will be
used, (see "Occupied Operation" on page 8) for
unit operation. If the U terminal is still grounded after
the 2-hour time limit, the unit will return to unoccupied
mode. Refer to "Unoccupied Operation – Stand Alone
Thermostat Control" on page 11.
OM 1149-2
MicroTech III Unit Controller
Fan Operation During
Most Modes, Faults and
Shutdowns
The MicroTech III unit controller allows fan operation
during most modes, faults and shutdowns to facilitate
maximum space comfort and control. However, the
fan does not operate during brownout or emergency
shutdown condition. During most modes, faults, or
shutdowns the fan will operate normally:
Operation with the High Speed Jumper
• The MicroTech III unit controller includes a highspeed jumper terminal labeled JP1 to speed system
check out and trouble-shooting. See Figure 2 on
page 7 for JP1 location.
Table 7: Room Sensor Status LED
LED On
Time (Sec)
LED Off
Time (Sec)
Operating Mode
0.5
0.5
Alarm Condition or Network “Wink”
Operation Active
0.0
Continually
Bypass Mode is Active
0.5
5.5
Unoccupied Mode
5.5
0.5
Standby Mode
Continually
0.0
Occupied Mode
Faults and Modes
Table 8: Priority Level of Faults and Modes
Priority Level
Mode or Fault
1
I/O Expansion Communication Fail
2
Invalid Configuration
3
Low Voltage Brownout
Note: This jumper is intended for factory unit testing
and should only be used by trained service technicians as several timing functions are reduced to
speed system check out.
• Disconnect power to the unit when installing or
removing the high-speed jumper.
4
Emergency Shutdown Mode
5
Compressor High Pressure
• The high speed jumper should only be used for a
short period of time for testing of the unit’s operation
by a trained service technician. The jumper must be
removed for normal unit operation.
10
Room Temp Sensor Fail
11
Entering Water Temp Sensor Fail
12
Leaving Water Temp Sensor Fail
13
Condensate Overflow
• If the jumper is left on after system check out, the
unit may be damaged.
14
Low Entering Water Temp
15
Serial EEPROM Corrupted
16
Waterside Economizer Low Temp Cutout
17
Service Test Mode
6
Compressor Low Pressure
7
Compressor Suction Temp Sensor Fail
8
Freeze Fault
9
Compressor Low Suction Temp
Table 9: MicroTech III Unit Controller Status LED's
Description
Type
Yellow
Green
Red
IO Expansion Communication Fail
Invalid Jumper Configuration
Fault
ON
Flash
Flash
Fault
Flash
Flash
OFF
Low Voltage Brownout
Fault
OFF
Flash
OFF
Emergency Shutdown
Mode
OFF
Flash
OFF
Compressor High Pressure
Fault
OFF
OFF
Flash
Compressor Low Pressure
Fault
OFF
OFF
ON
Compressor Suction Temp Sensor Fail
Fault
Flash
Flash
ON
Freeze Fault Detect
Fault
Flash
OFF
Flash
Compressor Low Suction Temp
Fault
Flash
OFF
OFF
Room Temp Sensor Fail (Room Sensor Control Only)
Fault
Flash
Flash
ON
Leaving Water Temp Sensor Fail (Freeze Fault Protect)
Fault
Flash
Flash
ON
Condensate Overflow (Cooling & Dehumidification Modes)
Fault
ON
OFF
OFF
Serial EEPROM Corrupted
Fault
ON
ON
ON
Waterside Economizer Low Temp Cutout
(WSE Control & Call for Cooling)
Mode
Flash
ON
Flash
Service Test Mode Enabled
Mode
Flash
Flash
Flash
Unoccupied Mode
Mode
ON
ON
OFF
Occupied, Bypass, Standby, or Tenant Override Modes
Mode
OFF
ON
OFF
OM 1149-2
16www.DaikinApplied.com
MicroTech III Unit Controller
Troubleshooting the Water Source Heat Pump Unit
Figure 6: Troubleshooting Guide - Unit Operation
Low voltage, check
power supply voltage
Fuse may be blown,
circuit breaker is open
Wire may be loose or broken.
Replace or tighten wires
Check wiring - loose or
broken and check for faulty
connection
Check relays and contacts,
also capacitor and wiring
Check high pressure switch,
low pressure switch and low
temperature switch to see if
unit is cycling on the safety
Unit control, check thermostat
for correct wiring or faulty
thermostat
Check capacitor
Neither fan, nor compressor
runs and all LED lights
are off
Compressor runs
in short cycle
Fan operates,
compressor does not
Unit
Check wiring - loose or broken
and check for bad connection
High or Low pressure lockout
A. Cool mode, check water flow
B. Heating mode, check air flow
C. Check reversing valve for
proper valve position
Check compressor overload make sure it is closed
Check to see if the reversing
valve is not hung up and is
operating correctly
Check compressor to ground, or
for internal short to ground
Check condensate overflow
switch in cool mode of
operation
Compressor winding may be
open. Check continuity with
ohm meter
Check thermostat for
proper location
Compressor attempts to
start but does not
Insufficient cooling or
heating
Check compressor wiring
for defective wiring or loose
connection
Check for defective
compressor internal windings
with ohm meter
Check thermostat for
improper location
Check for faulty compressor
capacitor
Check blower assembly for
dirt or faulty fan motor
capacity
Check for lock rotor amp
draw
Check for low refrigerant
charge
Check for proper air flow filter could be dirty
Check amp draw on blower
assembly
Check for proper water flow
and delta T (°F)
www.DaikinApplied.com17
OM 1149-2
MicroTech III Unit Controller
Microtech® III Unit Controller
Interface to External Equipment
•
•
•
•
The MicroTech III unit controller’s thermostat input
terminals may be directly interfaced with any standard
or night setback thermostat that uses mechanical dry
contacts. Power cannot be supplied from the water
source heat pump for electronic thermostats that require
a separate power supply for their internal operation
except those provided by Daikin. Only thermostats
offered by Daikin are proven to operate properly with the
MicroTech III unit controller. Daikin makes no guarantees
about any other thermostat or control device interfaced
by the end user with the MicroTech III unit controller.
Appendix A
Operation and Maintenance of I/O
Expansion Module
Introduction
Care must be used to isolate all external power sources
from the MicroTech III unit controller to prevent ground
loops and other unpredictable electrical problems. Only
dry mechanical contacts should be used to operate
or interface with the MicroTech III unit controller’s
thermostat and or control inputs. Use mechanical relays
to isolate two power systems when external equipment
with its own power supply is used to interface with or
control the MicroTech III unit controller’s thermostat and
or control inputs. For example, if you have a Building
Automation System (BAS), controller, etc., and you
wish to use a digital output from the building automation
system or controller that is internally powered, then you
must use an additional mechanical relay (not supplied by
Daikin) to isolate the MicroTech III unit controller.
The I/O Communication Module is an expansion of
the main board and provides extra functionality to the
MicroTech III control system.
• The MicroTech III unit controller in combination with
the I/O Expansion Module will be the standard control
system for SmartSource Water Source Heat Pumps.
Due to the nature of triacs and other solid state devices,
triacs cannot be directly used to operate the MicroTech
III’s unit controller’s thermostat or control inputs. To
interface triacs or other solid state switching devices to
the MicroTech III unit controller inputs, separate them
from the board using mechanical relays. To do this,
use the triac or solid state device to drive a mechanical
relay (not supplied by Daikin), then use the mechanical
relay’s dry contacts to drive the desired MicroTech III unit
controller input.
• Boilerless & Supplemental Auxiliary Heating Options
The MicroTech III unit controller’s valve or pump request
terminal {IV/PR (H8)} is an output signal to external
devices to allow water flow as required by the heat
pump. The IV/PR (H8) terminal follows compressor
operation inversely if connected to the normally open
terminal and simultaneously when connected to the
normally closed terminal. The IV/PR (H8) terminal can be
used as a signal to an external pump or valve to enable
flow to the unit. The compressor start is delayed for 30
seconds after the IV/PR (H8) output is energized.
Adding an I/O Expansion Module (with an interconnect
cable) to the main controller allows:
• Compressor High Capacity On/Off Control
• Variable Speed Fan Control
• Water Side Economizer Control
• Active Hot Gas/Reheat (HGR), or Low Capacity
Dehumidification Options
• The fourth thermostat Heating Stage (W4) Input
• Hydronic Heating Control
The I/O Expansion Module has an independent LED
annunciator to identify operational fault conditions.
Initial Power up
Figure 7: I/O Expansion Board Configuration Jumper Terminals
I/O expansion module
configuration jumper terminals
Table 10: IV/PR(H8) Terminal and Compressor Operation
IV/PR(H8)
Compressor On
Normally Open
24 VAC
0 VAC
Normally Closed
0 VAC
24 VAC
OM 1149-2
Compressor Off
18www.DaikinApplied.com
MicroTech III Unit Controller
Table 11: I/O Expansion Module Jumper Settings
I/O Expansion Description
Jumper(s)
Setting
Not Used
JP1
JP1 = Open
Not Used
JP2
JP2 = Open
JP3 = Open
JP4 = Open
Secondary Heating Options
JP3 & JP4
JP5 & JP6
None
JP3 = Shorted
JP4 = Open
Supplemental Electric Heat
JP3 = Open
JP4 = Shorted
Boilerless Electric Heat
JP3 = Shorted
JP4 = Shorted
Hydronic Heat
JP5 = Open
JP6 = Open
Dehumidification Options / Waterside Economizer
Model
None
JP5 = Shorted
JP6 = Open
Hot Gas/Water Reheat (HGR)
JP5 = Open
JP6 = Shorted
Waterside Economizer
Not Used
JP7
JP7 = Open
Compressor Capacity Option
JP8
JP8 = Open
JP8 = Shorted
Single-Stage Capacity
Dual-Stage Capacity
Operation
Thermostat Inputs
Waterside Economizer/ Dehumidification
• The Waterside Economizer/Dehumidification input
(TB1-1), when energized from the thermostat,
enables Waterside Economizer or Dehumidificaiton
operation depending on jumper configuration.
W4
• The W4 (TB1-2) terminal enables the second stage
of electric heat.
Electric Heat Controls
Supplemental Electric Heat Control
The supplemental electric heating option provides
additional stages of heating that can be used in
conjunction with compressor heating, or exclusively if the
compressor is not available for heating.
General Rules:
• Supplemental electric heater and the compressor
may operate simultaneously.
• Minimum Compressor ON and OFF timers do not
apply to electric heat control.
www.DaikinApplied.com19
Operation:
Fan Main Output: will turn ON and the Fan PWM signal
will be at “Auxiliary Heat” duty cycle when:
• Any auxiliary heat output is energized.
• For 30 fixed seconds after all auxiliary heat outputs
have been de-activated.
Electric Heat Outputs: are allowed to energize when
either condition exists:
• Inter-Stage ON timer must be expired.
• Compressor is not available for heating.
When Compressor is Available:
• Auxiliary Heat Stage #1 output energizes upon
activation of Heating – Stage #3.
• Auxiliary Heat Stage #2 output energizes upon
activation of Heating – Stage #4.
When Compressor is Unavailable:
• Auxiliary Heat Stage #1 output energizes upon
activation of “Heating – Stage #1.
• Auxiliary Heat Stage #2 output energizes upon
activation of Heating – Stage #4.
OM 1149-2
MicroTech III Unit Controller
Boilerless Heat Control
Operation:
• For geothermal applications the heater turns on
when the entering water temperature is less than
setpoint (default 28°F).
• When Entering Water Temperature (EWT) rises
above the hydronic heating on setpoint:
• Turns on the heater when the entering water
temperature is less than setpoint (default is 55°F), the
temperature set point is adjustable through the network.
The Auxiliary Heat Stage #1 (H8-4) output on the I/O
expansion board is used to open the hydronic heating valve.
• Hydronic heating setpoint allowed range is 70°F to
158°F, with a 70°F default value.
Note: In both cases the compressor is shut down.
• Compressor will be locked out of heating
Compressor Heating Source
Selection
• (compressor minimum on timer applies).
Compressor heating source selection provides a method to
disable the compressor operation when in the heating mode.
Baseboard JP7 configuration jumper
operation:
• Open: Enables compressor operation in the heating
mode.
• Shorted: Disables compressor operation in the
heating mode.
When compressor operation is disabled in the heating
mode and electric heat is available:
• Auxiliary Heat Stage #1: output energizes upon
activation of the “Heating – Stage #1”.
• Auxiliary Heat Stage #2: output energizes upon
activation of the “Heating – Stage #4”.
When compressor operation is disabled in the heating
mode and electric heat is unavailable:
• The unit will not provide any form of heating.
• If hydronic heating is required: the pump request
output is activated; the “wait for flow” timer is
canceled because the EWT is adequate for hydronic
heating; the hydronic heating output shall energize;
and the fan will turn on 30 seconds after the hydronic
heating output has been energized.
• The fan speed signal is based on the highest active
heating stage (#1 or #2)
Fan Speed Selector Switch
A 4-position fan speed selector switch located in the
control box allows CFM settings to be field adjustable.
Fan speed control optimizes unit fan speed based on
thermostat/room sensor inputs. The fan speed switch
allows for manually setting an optimal fan speed specific
to the application requirements. Each position on the fan
speed switch represents settings 1-4. See Table 12 and
Table 13 on page 21 for a list of fan speed selector
switch settngs.
Figure 8: 4-position fan speed selector switch
Hydronic Heat
General:
The hydronic heating option provides control of a two
position valve connected to a hot water coil when loop
water temperature is warm enough for hydronic heating.
• Loop water temperature is sensed by a factory
installed entering water temperature sensor located
on the inlet water line.
•
Hydronic heat circuit shall be independent and substitute
the use of the compressor driven refrigeration circuit.
OM 1149-2
20www.DaikinApplied.com
MicroTech III Unit Controller
Table 12: Fan speed selector switch settings (2-ton unit example)
CFM Setting
Stage 1 Heat
Stage 2 Heat
Stage 1 Cool
Stage 2 Cool
Fan Only
Dehumidification
Electric Heat
Setting 4 (High)
800
900
800
900
600
600
900
Setting 3 (Standard)
700
800
700
800
600
600
900
Setting 2 (Medium)
600
700
600
700
4560
600
900
Setting 1 (Low)
6 00
600
600
600
450
600
900
Fan Performance – Constant CFM Type ECM Motor
Table 13: Single stage units with constant CFM type ECM motor
Unit
Size
015
019
024
030
036
042
048
060
070
Setting
Maximum
ESP
(in. wg.)2
1Low CFM
Heat
1High CFM
Heat
1Low CFM
Cool
1High CFM
Cool
Fan
Only
Dehumidification
Electric
Heat
Setting 4 (High)
.70
500
560
500
560
375
375
560
Setting 3 (Standard)
.70
440
500
440
500
375
375
560
Setting 2 (Medium)
.70
375
440
375
440
280
375
560
Setting 1 (Low)
.70
375
375
375
375
280
375
560
Setting 4 (High)
.70
600
675
600
675
450
450
675
Setting 3 (Standard)
.70
525
600
525
600
450
450
675
Setting 2 (Medium)
.70
450
525
450
525
340
450
675
Setting 1 (Low)
.70
450
450
450
450
340
450
675
Setting 4 (High)
.70
800
900
800
900
600
600
900
Setting 3 (Standard)
.70
700
800
700
800
600
600
900
Setting 2 (Medium)
.70
600
700
600
700
450
600
900
Setting 1 (Low)
.70
600
600
600
600
450
600
900
Setting 4 (High)
.70
1000
1125
1000
1125
750
750
1125
Setting 3 (Standard)
.70
875
1000
875
1000
750
750
1125
Setting 2 (Medium)
.70
750
875
750
875
560
750
1125
Setting 1 (Low)
.70
750
750
750
750
560
750
1125
Setting 4 (High)
.70
1250
1400
1250
1400
940
938
1400
Setting 3 (Standard)
.70
1090
1250
1090
1250
940
938
1400
Setting 2 (Medium)
.70
940
1090
940
1090
700
938
1400
Setting 1 (Low)
.70
940
940
940
940
700
938
1400
Setting 4 (High)
.70
1400
1575
1400
1575
1050
1050
1575
Setting 3 (Standard)
.70
1225
1400
1225
1400
1050
1050
1575
Setting 2 (Medium)
.70
1050
1225
1050
1225
785
1050
1575
Setting 1 (Low)
.70
1050
1050
1050
1050
785
1050
1575
Setting 4 (High)
.70
1600
1800
1600
1800
1200
1200
1800
Setting 3 (Standard)
.70
1400
1600
1400
1600
1200
1200
1800
Setting 2 (Medium)
.70
1200
1400
1200
1400
900
1200
1800
Setting 1 (Low)
.70
1200
1200
1200
1200
900
1200
1800
Setting 4 (High)
.70
2000
2250
2000
2250
1500
1500
2250
Setting 3 (Standard)
.70
1750
2000
1750
2000
1500
1500
2250
Setting 2 (Medium)
.70
1500
1750
1500
1750
1120
1500
2250
Setting 1 (Low)
.70
1500
1500
1500
1500
1120
1500
2250
Setting 4 (High)
.70
2160
2400
2160
2400
1710
1710
2400
Setting 3 (Standard)
.70
1920
2160
1920
2160
1710
1710
2400
Setting 2 (Medium)
.70
1710
1920
1710
1920
1330
1710
2400
Setting 1 (Low)
.70
1710
1710
1710
1710
1330
1710
2400
Notes: 1 The unit is capable of high-low fan performance through the use of a 2-stage thermostat wired to specific
terminals for High-Low CFM fan performance. Standard operation with a 1-stage thermostat is indicated
as High CFM fan performance.
2 Applications up to 1.0" ESP (in. wg.) are possible. However, increased fan noise should be anticipated and appropriate noise attenuation should be considered.
www.DaikinApplied.com21
OM 1149-2
MicroTech III Unit Controller
I/O Expansion Module Faults and Fan Operating Modes
Table 14: I/O Expansion Module LED & Fault Outputs
Type
Yellow
Green
Red
Baseboard Communication Fail
Description
Fault
Flash
OFF
Flash
Entering Water Temp Sensor Fail
(Boilerless Electric Heat or Waterside Economizer Only or Hydronic Heat)
Fault
ON
OFF
Flash
Low Entering Water Temperature
(No Display On Boilerless Electric Heat)
Fault
OFF
ON
Flash
Fan is OFF
Mode
OFF
ON
OFF
Fan Running at Low Speed (0 to 33%) Duty Cycle
Mode
OFF
Flash
OFF
Fan Running at Medium Speed (34 to 66%) Duty Cycle
Mode
ON
Flash
OFF
Fan Running at High Speed (67 to 100%) Duty Cycle
Mode
Flash
Flash
OFF
Note: Mode / Faults are listed in order of priority.
Table 15: I/O Expansion Module Connectors and
Descriptions
H1 – 1
1
H4 – 1
1
Entering Water Temp Sensor – Signal
H1 – 2
H4 – 2
H1 – 3
H5 – 1
H1 – 4
H5 – 2
No Connection
H1 – 5
H5 – 3
Red LED Output
H1 – 6
H5 – 4
Green LED Output
H5 – 5
Yellow LED Output
H1 – 8
H5 – 6
Red-Green-Yellow LED Common
H1 – 9
H6 – 1 HP2-1 Comp High Capacity High Press Sw (HP2) Input Terminal 1
H1 – 10
H6 – 2 HP2-2 Comp High Capacity High Press Sw (HP2) Input Terminal 2
H1 – 11
H7 – 1
Fan Speed Table Row Select – Signal
H1 – 12
H7 – 2
Fan Speed Table Row Select – Common
Auxiliary Heat Stage #2 Output – N/O
H7 – 3
Thermostat – Heat Stage #4 (W4) Input – Signal
H2 – 2
No Connection
H7 – 4
Auxiliary 24 VAC Out
H2 – 3
24 VAC Common
H8 – 1
Ext. 24 VAC In
H8 – 2
24 VAC Common
H3 – 2
Ext. 24 VAC Common In
H8 – 3
No Connection
H3 – 3
HGR / Waterside Economizer Output – N/O
H8 – 4
Auxiliary Heat Stage #1 / Hydronic Heat Output N/O (24 VAC)
H3 – 4
Ext. 24 VAC Common
H8 – 5
H3 – 5
ECM Fan Motor Variable Speed Signal Output
TB1 – 1
1
Humidistat Signal Input
H3 – 6
ECM Fan Motor Variable Speed Signal – Common
TB1 – 2
2
Thermostat - Heat Stage #4 (W4) Input – Signal
Connections to Main Board
H1 – 7
H2 – 1
H3 – 1
1
1
OM 1149-2
Entering Water Temp Sensor – Common
1
1
No Connection
Compressor – High Capacity Output – N/O
24 VAC Common
22www.DaikinApplied.com
MicroTech III Unit Controller
Unit Options
■■ Wiring:
Waterside Economizer Control
• Digitally adjustable room temperature sensor (Part
No. 910121754)
• Thermostat (Part No. 910121746 or 910121748)/
Sensor (Part No. 667720401) Combination:
Waterside Economizer
• The Microtech III controls the waterside economizer.
Upon a call for economizer operation via TB1-1,
the output to the 3-way diverting valve and the fan
motor are energized, allowing water flow through the
economizer coil and fan operation.
Figure 9: Model GT thermostat and sensor combination
hot gas reheat smart dehumidification wiring diagram
Model GT
Unit
Thermostat
R
R24VAC
C
CCommon
G
GFan
Y1
Y1 Cool Stage 1
Y2
Y2 Cool Stage 2
Humidistat
TB-1
R 24VAC
DHDehumid
SmartSource Dehumidification
■■ Hot Gas Reheat Smart Dehumidification
■■ Simplified Dehumidification
■■ Humidistat Controlled Dehumidification
■■ Dehumidification Only
Hot Gas Reheat Smart
Dehumidification
Figure 10: Model GS thermostat and sensor combination
hot gas reheat smart dehumidification wiring diagram
■■ Application:
By utilizing the factory installed hot gas reheat and smart
air flow management; dehumidifiation can be achieved in
applications where precise humidity control is required.
■■ Items Required:
Model GS
Unit
Thermostat
R
R24VAC
C
CCommon
G
GFan
Y1
Y1 Cool Stage 1
Humidistat
TB-1
R 24VAC
DHDehumid
• Unit with Hot Gas Reheat option
• Humidistat and a Thermostat OR Digitally
Adjustable Wall Sensor
■■ Unit Control Settings:
• I/O Expansion Module Jumper Settings:
• JP5 = Shorted
• JP6 = Open
Figure 11: SmartSource MicroTech III board to digital room temperature sensor wiring
MicroTech III Board
SmartSource Board
I/O Expansion Module
Base Board
Terminal Block
Label
TB2-1
TB1-1
TB1-2
TB1-3
TB1-4
TB1-5
TB3-1
TB3-2
TB1-1
Description
24VAC
Unit Status
Output
Fan & Unit
Mode
Setpoint Adjust
Room Temp
Sensor & Tenant Override
DC Signal
Common
Emergency
Shutdown Input
Unoccupied
Input
Dehumidification Input
Terminal Label
R
1
2
3
4
5
E
U
1
Typical Wiring
R (24VAC)
1 (ST)
2 (FM)
3 (SP)
4 (UTS)
5 (GND)
6 (FC)
E
U
Description
24VAC
Unit Status
Output
Fan & Unit
Mode
Setpoint Adjust
Room Temp
Sensor & Tenant Override
DC Signal
Common
Fan Speed Select - Fan Coil
Version Only
Emergency
Shutdown
Unoccupied
Sensor
DH
Dehumidification
Terminal Label
Digitally Adjustable Room Temperature Sensor (Part No. 910121754)
www.DaikinApplied.com23
OM 1149-2
MicroTech III Unit Controller
■■ Operation:
■■ Wiring:
A call for heating or cooling has a higher priority
than a call for dehumidification. Dehumidification is
allowed only if the room temperature is satisfied. If the
controller detects the need for heating or cooling, or if
the Humidistat is no longer calling for dehumidification,
dehumidification mode will be suspended.
Dehumidification mode will enable the 3-way hot gas
bypass valve, sending hot superheated refrigerant to the
hot gas reheat coil while running the compressor at full
load and the fan at dehumidification speed.
Note: See Fan Performance section in catalog for unit
size specific fan speeds.
Figure 12: Model GT unit and thermostat simplified
dehumidification wiring diagram
Model GT
Unit
R
C
G
TB-1
Y1
Y2
Thermostat
R24VAC
CCommon
GFan
Y1 Cool Stage 1
Y2 Cool Stage 2
Y3 Cool Stage 3
Simplified Dehumidification
Figure 13: Model GS unit and thermostat simplified
dehumidification wiring diagram
By utilizing a basic thermostat and configuring the
Microtech III unit controller for this mode of operation,
the WSHP will provide maximum latent capacity by
optimizing blower fan speeds resulting in decreased
humidity levels in the conditioned space.
■■ Items Required:
Model GS
Unit
R
C
G
TB-1
Y1
■■ Application:
• Model GT = 3 stage thermostat
• Model GS = 2 stage thermostat
Note: This feature is not available if unit is controlled by
wall sensor
■■ Unit Control Settings:
• I/O Expansion Module Jumper Settings:
• JP5 = Shorted
• JP6 = Open
Thermostat
R24VAC
CCommon
GFan
Y1 Cool Stage 1
Y2 Cool Stage 2
■■ Operation:
Unit will run at maximum compressor capacity with low
CFM to maximize latent capacity.
Example: A 2-stage model GT, unit size 026, wired for
Simplified Dehumidifcation:
• Upon a call for Y1, TB1-1 on the unit control board will
be energized, allowing the compressor to operate at
full load and the fan to operate at 600 CFM.
• Upon a call for Y2, Y1 on the unit control board
will be energized, allowing the compressor to
operate at part load and the fan to operate at 700
CFM. (Factory default fan speed setting #3)
• Upon a call for Y3, Y2 on the unit control board
will be energized, allowing the compressor to
operate at full load and the fan to operate at 800
CFM. (Factory default fan speed setting #3)
OM 1149-2
24www.DaikinApplied.com
MicroTech III Unit Controller
Humidistat Controlled
Dehumidification
Figure 14: Model GT thermostat and humidistat
combination - humidistat controlled dehumidification
wiring diagram
■■ Application:
Model GT
Unit
Thermostat
R
R24VAC
C
CCommon
G
GFan
Y1
Y1 Cool Stage 1
Y2
Y2 Cool Stage 2
Humidistat
TB-1
R 24VAC
DHDehumid
Similar to the simplified dehumidification option,
this option also maximizes latent capacity by using
a humidistat and thermostat. This option allows the
room thermostat to control sensible cooling, while the
independent humidistat controls room humidity levels
■■ Items Required:
• Humidistat combined with a...
• Model GT = 3 stage thermostat
• Model GS = 2 stage thermostat
OR
• I/O Expansion Module Jumper Setting:
• JP5=Shorted
• JP6=Open
Note: This feature is not available if unit is controlled by
wall sensor
■■ Unit Control Settings:
• I/O Expansion Module Jumper Settings:
• JP5=Shorted
• JP6=Open
Figure 15: Model GS thermostat and humidistat
combination - humidistat controlled dehumidification
wiring diagram
Model GS
Unit
Thermostat
R
R24VAC
C
CCommon
G
GFan
Y1
Y1 Cool Stage 1
Humidistat
TB-1
R 24VAC
DHDehumid
■■ Wiring:
• Thermostat/Sensor combination:
• Field supplied sensor
Figure 16: SmartSource MicroTech III board & I/O expansion module to field supplied room temperature sensor wiring
MicroTech III Board
SmartSource Board
I/O Expansion Module
Base Board
TB1-1
TB1-2
Description
24VAC
Unit Status Output
Fan & Unit Mode
Humidistat Source
Voltage (24VAC)
Terminal Label
R
1
2
3
4
5
E
U
1
Terminal Label
X
X
X
Description
Dehumidification Output
TB3-2
Dehumidification
Input
TB3-1
Unoccupied Input
TB1-5
Emergency Shutdown Input
TB1-4
DC Signal Common
TB1-3
DC Signal Common
TB1-2
Room Temp Sensor,
10K Ohm ATP Curve Z
or equivalent
TB1-1
Room Temp Sensor
& Tenant Override
TB2-1
Setpoint Adjust
Terminal Block
Label
Typical Wiring
www.DaikinApplied.com25
Dehumidification
Source Voltage
Sensor
X
Field Supplied Room Temperature Sensor
OM 1149-2
MicroTech III Unit Controller
■■ Operation:
■■ Wiring:
Unit will run at maximum compressor capacity with low
CFM to maximize latent capacity.
Example: A 2-stage model GT, unit size 026, wired for
Humidistat Controlled Dehumidification:
• Upon a call for dehumidificaion, TB1-1 on the
unit control board will be energized by the
humidistat, allowing the compressor to operate at
full load and the fan to operate at 600 CFM.
• Upon a call for stage 1 cooling, Y1 on the unit
control board will be energized from Y1 on the
thermostat, allowing the compressor to operate
at part load and the fan to operate at 700 CFM.
(Factory default fan speed setting #3)
• Upon a call for stage 2 cooling, Y2 on the unit
control board will be energized from Y2 on the
themostat, allowing the compressor to operate
at full load and the fan to operate at 800 CFM.
(Factory default fan speed setting #3)
Note: See Fan Performance section in catalog for unit
size specific fan speeds.
Figure 17: Model GS & GT unit and humidistatdehumidification only wiring diagram
Dehumidification Only
■■ Application:
Model GS & GT
Unit
Humidistat
R
R24VAC
C
DHDehumid
G
TB1-1
■■ Operation:
Upon a call for dehumidification, the unit will run in
cool stage 1 compressor capacity and cool stage 1 fan
speed.
Example: A 2-stage model GT, unit size 026, wired for
Dehumidification Only:
• Upon a call for dehumidification from the
humidistat, TB1-1 on the unit control board
will be energized, allowing the compressor to
operate at full load and the fan to operate at 600
CFM.
Note: See Fan Performance section in catalog for unit
size specific fan speeds.
In applications where only dehumidification is needed,
the humidistat can be wired to TB1-1 on the Microtech
III unit controller, allowing the WSHP unit to operate in
dehumidification mode only. The unit will only respond to
a call for dehumidification.
■■ Items Required:
• Humidistat
■■ Unit Control Settings:
• I/O Expansion Module Jumper Settings:
• JP5=Shorted
• JP6=Open
OM 1149-2
26www.DaikinApplied.com
MicroTech III Unit Controller
Appendix B
MicroTech III Unit Controller with
LonWorks® Communication Module
For installation and operation information on LonWorks
Communication Module and other ancillary control
components, see:
• IM 927 - MicroTech III Water Source Heat Pump
LonWorks Communication Module.
• IM 933 - LonMaker Integration Plug-in Tool: For use
with the MicroTech III Unit Controller.
MicroTech III Unit Controller with LonWorks
Communication Module orchestrates the following unit
operations:
• Enable heating and cooling to maintain setpoint
based on a room sensor
• IM 955 - MicroTech III Wall Sensor for use with
Microtech III Unit Controller
• Enable fan and compressor operation
Each Daikin water source heat pump can be equipped
with a LonWorks communication module that is
LonMark 3.4 certified to meet the LonMark Space
Comfort Control (SCC) profile for heat pumps. The
controller is microprocessor-based and is designed
to communicate over a LonWorks network. With the
optional factory or field-installed communication module.
The unit controller is programmed and tested with all the
logic required to monitor and control the unit. An optional
wall sensor may be used with the communication
module to provide limited local control of the Water
Source Heat Pump. The unit controller monitors water
and air temperatures and passes information to the
communication module. The module communicates with
the BAS to provide network control of the Water Source
Heat Pump.
• Monitors room and discharge air temperatures
Figure 18: LonWorks Communication Module
• Monitors all equipment protection controls
• Monitors leaving water temperature
• Relays status of all vital unit functions
The MicroTech III unit controller with
an optional communication module
includes:
• Return Air Temperature sensor (RAT)(field-installed)
• Discharge Air Temperature sensor (DAT)(fieldinstalled)
• Leaving Water Temperature sensor (LWT)
Note: Refer to IM 956-X for details to install (RAT) &
(DAT) sensors.
CAUTION
When an optional wall-mounted room temperature sensor is
connected to the unit controller, the Return Air Temperature (RAT)
sensor must not be installed. A wall-mounted room temperature
sensor and the return air temperature sensor must not be
connected simultaneously or the unit will not operate properly.
The MicroTech III unit controller with communication
module includes a unit-mounted return air, discharge air
and leaving water temperature sensor. Wall mounted
temperature sensors include setpoint adjustment
and tenant override. The user has the capability of
substituting the wall sensor with a duct-mounted return
air sensor.
www.DaikinApplied.com27
The communication module provides access to setpoints
for operational control
Available wall sensors include:
• Room sensor with LED status and tenant override
button
• Room sensor with LED status, tenant override
button, and ±5°F setpoint adjustment
• Room sensor with LED status, tenant override
button, 55° to 95°F setpoint adjustment
OM 1149-2
MicroTech III Unit Controller
MicroTech III Controller with an
Optional BACnet® Communication
Module
MicroTech III Unit Controller with
BACnet MS/TP Communication
Module orchestrates the following unit
operations:
• Enable heating and cooling to maintain setpoint
based on a room sensor
• Enable fan and compressor operation
For installation and operation information on MicroTech
III unit controller and other ancillary components, see:
• IM 928 - MicroTech III Water Source Heat Pump
BACnet Communication Module
• IM 955 - MicroTech III Wall Sensor For use with
Microtech III Unit Controller
Daikin water source heat pumps are available with
an optional BACnet MS/TP communication module
that is designed to communicate over a BACnet MS/
TP communications network to a building automation
system (BAS). It can be factory or field-installed.
The unit controller is programmed and tested with all the
logic required to monitor and control the unit. An optional
wall sensor may be used with the communication
module to provide limited local control of the water
source heat pump. The unit controller monitors water
and air temperatures and passes information to the
communication module. The module communicates with
the BAS, to provide network control of the water source
heat pump.
The module makes operational data and commands
available on a communications network using BACnet
objects and properties:
• The network cable is a shielded twisted-pair cable
• Network communications run up to 76.8 Kbps
• DIP switches on the controller enable the MS/TP
MAC address to be set in the range 0-127
• Four green status LEDs on the communication
module indicate communication activity on the
MS/TP communication network and with the unit
controller
Figure 19: MicroTech III BACnet MS/TP Snap-in
Communication Module
OM 1149-2
• Monitors all equipment protection controls
• Monitors room and discharge air temperatures
• Monitors leaving water temperature
• Relays status of all vital unit functions
The MicroTech III unit controller with
an optional communication module
includes:
• Return Air Temperature sensor (RAT)(field-installed)
• Discharge Air Temperature sensor (DAT)(fieldinstalled)
• Leaving Water Temperature sensor (LWT)
Note: Refer to IM 956-X for details to install (RAT) &
(DAT) sensors.
CAUTION
When an optional wall-mounted room temperature sensor is
connected to the unit controller, the Return Air Temperature (RAT)
sensor must not be installed. A wall-mounted room temperature
sensor and the return air temperature sensor must not be
connected simultaneously or the unit will not operate properly.
The communication module provides access to setpoints
for operational control
Available wall sensors include:
• Room sensor with LED status and tenant override
button
• Room sensor with LED status, tenant override
button, and ±5°F setpoint adjustment
• Room sensor with LED status, tenant override
button, 55° to 95°F setpoint adjustment
28www.DaikinApplied.com
Typical Wiring Diagrams
115V, 1Ph – Model WGS, MicroTech III SmartSource Unit Controller with
BACnet Communication Module (Hot Gas Reheat) (See page 30 for
Service & Disconnect Wiring)
www.DaikinApplied.com29
OM 1149-2
Typical Wiring Diagrams
Service & Disconnect Wiring - 115V, 1Ph – Model WGS, MicroTech III SmartSource
Unit Controller with BACnet Communication Module (Hot Gas Reheat)
OM 1149-2
30www.DaikinApplied.com
Typical Wiring Diagrams
265V, 1Ph – Model WGS-WGT, MicroTech III SmartSource Unit Controller
with BACnet Communication Module (Hot Gas Reheat) (See page 32
for Service & Disconnect Wiring)
www.DaikinApplied.com31
OM 1149-2
Typical Wiring Diagrams
Service & Disconnect Wiring - 265V, 1Ph – Model WGS-WGT, MicroTech III
SmartSource Unit Controller with BACnet Communication Module (Hot Gas Reheat)
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Typical Wiring Diagrams
208-230V, 1Ph – Model WGS-WGT, MicroTech III SmartSource Unit
Controller with BACnet Communication Module (Waterside Economizer,
Desuperheater, 115V Loop Pumps & 20kW Electric Heat) (See page 34
for Service & Disconnect Wiring)
www.DaikinApplied.com33
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Typical Wiring Diagrams
Service & Disconnect Wiring - 208-230V, 1Ph – Model WGS-WGT, MicroTech III
SmartSource Unit Controller with BACnet Communication Module (Waterside
Economizer, Desuperheater, 115V Loop Pumps & 20kW Electric Heat)
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34www.DaikinApplied.com
Typical Wiring Diagrams
208-230V, 3Ph – Model WGS-WGT, MicroTech III SmartSource Unit
Controller with BACnet Communication Module (Waterside Economizer,
230V Loop Pumps & 5kW Electric Heat) (See page 36 for Service &
Disconnect Wiring)
www.DaikinApplied.com35
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Typical Wiring Diagrams
Service & Disconnect Wiring - 208-230V, 3Ph – Model WGS-WGT, MicroTech III
SmartSource Unit Controller with BACnet Communication Module (Waterside
Economizer, 230V Loop Pumps & 5kW Electric Heat)
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36www.DaikinApplied.com
Typical Wiring Diagrams
460V, 3Ph – Model WGS-WGT, MicroTech III SmartSource Unit Controller
with BACnet Communication Module (Waterside Economizer, 230V Loop
Pumps & 20kW Electric Heat) (See page 38 for Service & Disconnect
Wiring)
www.DaikinApplied.com37
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Typical Wiring Diagrams
Service & Disconnect Wiring - 460V, 3Ph – Model WGS-WGT, MicroTech III
SmartSource Unit Controller with BACnet Communication Module (Waterside
Economizer, 230V Loop Pumps & 20kW Electric Heat)
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Appendix C
Controller Comparison
Note: The Mark IV, MicroTech 2000, Alerton and MicroTech III boards are NOT interchangeable.
Table 16: Control Boards and Features
● = Applies
Mark IV
MicroTech 2000 – = Does not apply
Alerton
MicroTech III
DC Power
●
–
–
–
AC Power
●
●
● ●
Terminal Connection 1/4″ Push-on ●
–
–
–
Features
IDC Connection
–
●
●
●
Fault Indicators
●
●
–
●
Thermostatic Controls
●
–
–
●
Room Sensor
–
●
●
●
LONmark Capable
–
●
–
●
LonWorks Capable
–
●
–
–
BACnet
Capable(1)
Motorized Valve Capability
–
–
●
●
–
●
●
●
Short Cycle Protection & Random Start
●
●
●
●
Unoccupied Mode
●
●
●
●
Override Mode
●
●
●
●
Pump Restart
●
●
●
●
Loadshed
●
●
●
–
Brownout Protection
●
●
●
●
Unit Shutdown
●
●
●
●
Condensate Overflow Protection
●
●
●
●
Remote Reset(1)
●
–
–
●
Intelligent Reset(1)
–
–
–
●
Dual Circuit Capability
●
●
●
●
Adjustable Set Points Through Software
–
●
●
●
Adjustable Fan Speed
–
–
–
●
Electric Heat Availability
–
–
–
●
Service Tools Needed at Start up
–
●
●
●
Dipswitch Settings
–
–
●
–
Programmable Front-end Settings
–
●
–
●
Switching Line Voltage
●
–
–
●
Note:
(1) Alerton BACnet requires Alerton service tools for commissioning
(1) Alerton dipswitch settings must be configured during commissioning
(1) See Remote Reset and Intelligent Reset information under section: Additional Operating Modes
www.DaikinApplied.com39
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Daikin Applied Training and Development
Now that you have made an investment in modern, efficient Daikin equipment, its care should be a high
priority. For training information on all Daikin HVAC products, please visit us at www.DaikinApplied.com
and click on Training, or call 540-248-9646 and ask for the Training Department.
Warranty
All Daikin equipment is sold pursuant to its standard terms and conditions of sale, including Limited
Product Warranty. Consult your local Daikin Applied representative for warranty details. Refer to Form
933-430285Y. To find your local Daikin Applied representative, go to www.DaikinApplied.com.
Aftermarket Services
To find your local parts office, visit www.DaikinApplied.com or call 800-37PARTS (800-377-2787).
To find your local service office, visit www.DaikinApplied.com or call 800-432-1342.
This document contains the most current product information as of this printing. For the most up-to-date
product information, please go to www.DaikinApplied.com.
Products manufactured in an ISO Certified Facility.
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©2014 Daikin Applied (7/14) | (800) 432–1342 | www.DaikinApplied.com