1. business and industrial
2. energy
3. oil

Installation Manual
Uniflair™ LE Cooling Units
Direct Expansion, Twin-Cool, Energy Saver
60 Hz
990-4482B-001
Publication Date: June 2014
Schneider Electric IT Corporation Legal Disclaimer
The information presented in this manual is not warranted by the Schneider Electric IT Corporation to be authoritative,
error free, or complete. This publication is not meant to be a substitute for a detailed operational and site specific
development plan. Therefore, Schneider Electric IT Corporation assumes no liability for damages, violations of codes,
improper installation, system failures, or any other problems that could arise based on the use of this Publication.
The information contained in this Publication is provided as is and has been prepared solely for the purpose of evaluating
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accuracy of the information this Publication contains.
IN NO EVENT SHALL SCHNEIDER ELECTRIC IT CORPORATION, OR ANY PARENT, AFFILIATE OR
SUBSIDIARY COMPANY OF SCHNEIDER ELECTRIC IT CORPORATION OR THEIR RESPECTIVE
OFFICERS, DIRECTORS, OR EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT,
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Table of Contents
General Information ................................................................... 1
Important Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Warnings for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Work requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warning for Lifting and Transportation . . . . . . . . . . . . . . . . . . . 2
Electrical safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Equipment Guidelines............................................................... 3
Warnings for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Anti-freeze mixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Environmental Limits for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Hot water reheat circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Cold water circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Lifting and Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
General Information ................................................................... 5
Document Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Cross-reference symbol used in this manual . . . . . . . . . . . . . . 5
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Unit Overview .............................................................................. 6
Types of Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Airflow Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Upflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Downflow/Underfloor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Name Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Uniflair LE Direct Expansion Installation Manual
i
Component Identification....................................................... 10
External Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Display interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Cover panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Internal Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Downflow units (TDAV1121 shown) . . . . . . . . . . . . . . . . . . . .
Upflow units (TUAV1121 shown) . . . . . . . . . . . . . . . . . . . . . .
Cooling circuit (TDAV1121 shown) . . . . . . . . . . . . . . . . . . . . .
Electrical panel door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brazed plate heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . .
12
13
14
14
15
16
Installation .................................................................................. 17
Site Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Access and clearance requirements . . . . . . . . . . . . . . . . . . . . 17
Power supply requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Humidifier and drain requirements . . . . . . . . . . . . . . . . . . . . . 18
Installation Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Installation on non-raised flooring . . . . . . . . . . . . . . . . . . . . . . 18
Installation on raised access flooring . . . . . . . . . . . . . . . . . . . 18
Floor stand installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Opening the Door and Removing the Front Panels . . . . . . . . . . . . . . . 20
Main disconnect switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Opening the door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Internal Protection and Rear Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Unit Connections...................................................................... 23
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Connecting power to the unit . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Setting the unit power supply voltage . . . . . . . . . . . . . . . . . . . 24
Network Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Drain Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Connecting to building drains (without humidifier) . . . . . . . . . . 26
Pressure Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
ii
Uniflair LE Direct Expansion Installation Manual
Refrigerant Piping Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
General guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equivalent line length of fittings . . . . . . . . . . . . . . . . . . . . . . . .
Discharge line sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calculating total discharge line size . . . . . . . . . . . . . . . . . .
Discharge line size—vertical . . . . . . . . . . . . . . . . . . . . . . . .
Discharge line size—horizontal . . . . . . . . . . . . . . . . . . . . . .
Liquid line sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigeration circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gross pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28
28
29
30
30
30
31
31
31
31
32
Water Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Filling the Chilled Water Circuit . . . . . . . . . . . . . . . . . . . . . . . . 34
Energy Saver Units ..................................................................35
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Accessories ...............................................................................37
Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Humidifier connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the drainage and water supply lines . . . . . . . .
Supply water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37
38
38
39
Temperature and Humidity Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Uniflair LE Direct Expansion Installation Manual
iii
General Information
Important Safety Information
Read the instructions carefully to become familiar with the equipment before trying to install, operate,
service, or maintain it. The following special messages may appear throughout this manual or on the
equipment to warn of potential hazards or to call attention to information that clarifies or simplifies a
procedure.
The addition of this symbol to a Danger or Warning safety label indicates that an electrical
hazard exists which will result in personal injury if the instructions are not followed.
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
DANGER
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death
or serious injury.
WARNING
WARNING indicates a potentially hazardous situation which, if not avoided, can result in death
or serious injury.
CAUTION
CAUTION indicates a potentially hazardous situation which, if not avoided, can result in minor
or moderate injury.
NOTICE
NOTICE addresses practices not related to physical injury including certain environmental
hazards, potential damage or loss of data.
Uniflair LE Direct Expansion Installation Manual
1
Warnings for Installation
Work requirements
• All work on the electrical installation must be carried out by licensed technicians only.
• All installation work must be carried out by technicians that have been qualified and trained on
Schneider Electric cooling products.
• Technical personnel must use appropriate equipment when checking the grounding of devices.
• Adopt all of the cautions provided by the relevant safety standards in order to prevent any
possible damage to people or objects.
• Installation locations should be secure and limited to site authorized personnel and/or trained
service technicians.
Warning for Lifting and Transportation
Lifting and transporting the units must be carried out by specialized personnel as described in this
manual.
WARNING
DAMAGE TO EQUIPMENT OR PERSONNEL
• The equipment is heavy and can easily be tipped. For safety purposes, adequate
personnel must be present when moving this equipment.
• The load must always be solidly anchored to the bearing element of the lifting equipment
and means of transport.
• No one should be near the suspended load, nor in the working area of the crane, forklift
truck or any other lifting equipment or means of transport.
Failure to follow these instructions can result in moderate injury or equipment
damage.
Electrical safety
Read and adhere to the following important safety considerations when working with this cooling unit.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Turn off all power supplying this equipment before working on the equipment.
• Practice Lockout/Tagout procedures.
• All electrical work must be performed by licensed electricians.
• All electrical wiring must comply with local and national codes and regulations.
• Do not wear jewelry when working with electrical equipment.
• Ensure the equipment is connected to a grounded outlet.
Failure to follow these instructions will result in death or serious injury.
2
Uniflair LE Direct Expansion Installation Manual
Equipment Guidelines
Warnings for Use
The air conditioning units have been designed and produced to provide air conditioning within the limits and
methods described in this manual. The air conditioners must be used exclusively indoors.
No modifications may be made to the units or their parts without explicit written consent from Schneider
Electric. Only use the machinery for the purpose for which it was designed and manufactured. Any mechanical
or electrical modification will void any factory warranty.
Anti-freeze mixtures
The units are designed to operate both with pure water and with anti-freeze mixtures. If used with anti-freeze
mixtures, the units can only operate with water mixed with ethylene glycol or propylene glycol with a maximum
concentration weight of 40%.
NOTE: Please contact Schneider Electric for applications outside of the documented specifications.
Environmental Limits for Use
In order to achieve rated performance, the environmental conditions must be within the following values:
Hot water reheat circuit
• Maximum inlet hot water temperature: 82°C (180°F) (test based)
• Minimum inlet hot water temperature: 45°C (113°F)
• Maximum operating pressure hot water circuit: 2068 kPa (300 psi)
Cold water circuit
• Maximum inlet cold water temperature:
– T*TV: 25°C (77°F)
– T*DV:
• 25°C (77°F) for chilled water circuit
• 43.3°C (110°F) for condensing water circuit
– T*EV:
• 25°C (77°F) for Energy Saving mode
• 43.3°C (110°F) for DX mode
– T*WV: 40.5°C (105°F)
• Minimum inlet cold water temperature:
– T*TV: 6°C (42°F)
– T*DV:
• 6°C (42°F) for chilled water circuit
• 18.3°C (65°F) for condensing water circuit
– T*EV:
• 6°C (42°F) for Energy Saving mode
• 18.3°C (65°F) for DX mode
– T*WV: 18.3°C (65°F)
• Maximum glycol percentage: 50%
• Maximum operating pressure cold water circuit: 2068 kPa (300 psi)
Uniflair LE Direct Expansion Installation Manual
3
Air
• Maximum inlet air temperature: 35°C (95°F)
• Minimum inlet air temperature: 17.8°C (64°F)
• Maximum inlet relative humidity: 70%
• Minimum inlet relative humidity: 20%
Lifting and Rigging
na5171a
The following graphic provides an example of equipment used to move the unit safely.
Storage
If the cooling unit will not be installed immediately, store it in a safe place and adhere to the following
requirements:
• Packaging must be intact
• Storage area must be dry (<85% R.H.) and protected against extreme temperatures 50°C (122°F) or
sustained temperatures below 0°C (32°F).
4
Uniflair LE Direct Expansion Installation Manual
General Information
Document Overview
This manual describes the cooling units with 208–230V/3-phase/60Hz, 460V/3-phase/60Hz, and 575V/3phase/60Hz power supply. It supplies general information, safety instructions, unit transportation, installation
information, and necessary information about how to use the units.
The descriptions and illustrations in this manual are owned by Schneider Electric. Schneider Electric reserves
the right to make any alterations it sees fit in order to improve the product without having to update this
document.
The illustrations in this manual are examples only. Component locations depend on model type and
configuration.
Cross-reference symbol used in this manual
See another section of this document or another document for more information on this subject.
NOTE: Indicates important information.
Abbreviations
T*AV—Air-Cooled
T*TV—Twin-Cool Air-Cooled
T*WV—Water-Cooled
T*DV—Twin-Cool Water-Cooled
T*EV—Energy Saving
*Upflow (U)/Downflow (D)
Uniflair LE Direct Expansion Installation Manual
5
Unit Overview
Types of Cooling
A precision air conditioner is designed to control environments for telecom rooms, Internet hubs, and data
processing centers. The Uniflair DX series is available in the following types of cooling configurations:
• Air-cooled Direct Expansion—Air cooled DX units extract heat from the room and transfer it to the
outside using air cooled refrigerant heat exchangers (condensers). The room unit and external
condenser form an autonomous sealed circuit once installed. Each refrigeration circuit must be
connected to its remote air-cooled condenser with copper pipe.
• Water-cooled Direct Expansion—In DX water-cooled units, the heat extracted from the room is
transferred to water via a stainless steel brazed plate heat exchanger within the unit. The cooling water
may be supplied from the mains supply, a cooling tower or a well (open circuit), or recycled in a closed
loop cooled by external coolers. In a closed-loop system, an anti-freeze mixture of water and ethylene
glycol is normally used. The water cooled units have refrigerant circuits that are charged and sealed in
the factory and do not require site-installed refrigerant piping.
• Twin Cool with chilled water cooling and air-cooled or water-cooled Direct Expansion—Twin-Cool DX
units are typically deployed in installation sites where the chilled water source cannot be relied on for
continuous service. In this application, function priority is given to the chilled water circuit. If the chilled
water supply is insufficient, or if the water is not cold enough to dissipate the entire heat load, the
microprocessor controller automatically starts direct expansion operation. Alternately, the unit can be
configured to prioritize direct expansion operation and to activate chilled water operation in the event of a
compressor shut-down.
• Energy Saving with economizer cooling and water cooled Direct Expansion—Energy-Saving units
provide an energy-efficient solution in cool or temperate climates. They are designed to provide
significant reductions in operating costs and payback periods.The operating principle exploits the freecooling effect available when the outside temperature is lower than the inside temperature: the lower the
outside temperature, the greater the energy saving. The microprocessor controller manages the
operation of the unit automatically in three different situations:
– Typical operation—In summer, the unit operates as a typical closed circuit, glycol-cooled system.
– Partial Economization—As the external temperature decreases, the coolant can be used directly for
the free-cooling of the air. In this application, the coolant is circulated in the coil inside the unit, and
both the refrigerant circuit and the glycol circuit contribute to cooling, thus reducing the energy used
by the compressor.
– Total Economization—If the outside temperature increases further to where the coolant can dissipate
the entire heat load from the room, then the refrigerant circuit is shut down completely, and the unit
functions as a traditional chilled water unit with a modulating valve.
6
Uniflair LE Direct Expansion Installation Manual
Airflow Configurations
Upflow
na4934a
Upflow units are designed to distribute air through a supply plenum, pre-engineered duct system, or drop
ceiling. Return air can enter the unit via the front, rear, or bottom of the unit based on configuration. A sub-base
is required to allow access for power, water, and refrigerant connections on non-raised floor installations.
FRONT RETURN
WITH TOP SUPPLY
BOTTOM RETURN
WITH TOP SUPPLY
FRONT RETURN WITH
FRONT SUPPLY
(PLENUM AND GRILLE)
REAR RETURN
WITH TOP SUPPLY
Downflow/Underfloor
na4933a
Downflow units are designed to distribute air through a void under a raised access floor or a front supply subbase plenum when a raised floor is not available. Return air enters the top of the unit directly from the
environment or through a duct system.
TOP RETURN WITH
BOTTOM SUPPLY
(PLENUM AND GRILLE
Uniflair LE Direct Expansion Installation Manual
TOP RETURN WITH
BOTTOM SUPPLY
(FLOORSTAND)
7
Model Number Nomenclature
T D A V 33 4
2
G
IDENTIFYING PREFIX
AIRFLOW PATTERN
U = UPFLOW
D = DOWNFLOW
HEAT OF REJECTION TYPE
A = AIR-COOLED DIRECT EXPANSION UNITS
W = WATER-COOLED DIRECT EXPANSION UNITS
T = TWIN-COOL (AIR-COOLED) UNITS
D = TWIN-COOL (WATER-COOLED) UNITS
E = ENERGY SAVING UNITS
FAN TYPE
V = CENTIFUGAL (EC) FANS WITH BACKWARD-CURVED
NOMINAL COOLING CAPACITY
05 = 17kW; 06 = 19 kW; 09 = 25 kW; 11 = 35kW; 14 = 46 kW; 16 = 51 kW;
18 = 53 kW; 22 = 70 kW; 25 = 72 kW; 28 = 76 kW; 33 = 78 kW
NUMBER OF COMPRESSORS INSTALLED
POWER SUPPLY VOLTAGE
D = 208 – 230 V/3 Ph/60 Hz
G = 460 V/3 Ph/60 Hz
L = 575 V/3 Ph/60 Hz
8
na4117a
NUMBER OF REFRIGERATION CIRCUITS
Uniflair LE Direct Expansion Installation Manual
Name Plate
Units can be identified by the name plate in the electrical panel of the unit. The model and any additionally
installed accessories are indicated by an X in the corresponding box.
The plate provides the following data:
• Model and serial number
• Type of power supply
• Overall electrical rating
• Individual load electrical ratings
• Full load amps (FLA)
• Minimum circuit ampacity (MCA)
• Maximum overcurrent protection (MOP)
• Maximum inlet hot water temperature (if present)
• Maximum fan static pressure at max fan speed (ESP MAX)
• Efficiency rating of the unit (SCOP)
TDAV3342G(C)
TENS.
SERIA L No .
460V/3Ph/60Hz
COMPRESSOR
FAN
UNIT
MCA
MOP
AUX.
24-230V
NO.
TENS. (V)
FLA (A ) [/1]
RLA (A ) [/1]
LRA (A ) [/1]
P (kW/HP ) [/1]
4
3
460/3
380-480/3
14.5
4.9
14.5
0
100
0
9.17/12.3
3.08/4.13
72.7
45.92/61.58
76 A
90 A
Short-circuit current: 5 kA rms symmetrical, 600 V maximum
AP1-2
STOP :
VAC
ESP TD.A-W (Max)
SAFETY VALVE
CHARGE:
PRECHARGE:
Uniflair LE Direct Expansion Installation Manual
OP EN:
40.5/587.4 bar/psi
(Manual reset)
77/170.6 °C/°F
(Max inlet hot w ater temperature)
505/2.03 Pa/in.w .g. (Max fan speed)
45/652.7 bar/psi
R410A
kg/circ.
0.0 oz/circ.
DRY NITROGEN N2
9
Component Identification
External Components
Item




Description
Cover panels
Display interface
Electric panel door
Main disconnect
Display interface
Display
Reset
10/100
USB
Console
10
na4820a
Micro
SD
Service
Port
Item
Description
Function

LCD display
7-inch touch-screen color display.

Power LED
The cooling unit is powered when the LED is illuminated.

Check Log LED
When this LED is illuminated, a new entry has been made
to the event log.

Alarm LED
Displays current alarm condition of unit.

Status LED
Displays current network management card status.

Link-RX/TX (10/100) LED
Displays current network link status.

Display Reset button
Resets the display microprocessor. This has no effect on
the air conditioner controller.

Micro SD card slot
Memory card expansion slot.
Uniflair LE Direct Expansion Installation Manual
Item
Description
Function

Service port
USB-B port used only by service personnel.

USB-A port
Supports firmware upgrades.

Serial Configuration port
Connects the display to a local computer to configure initial
network settings or access the command line interface
(CLI).
Cover panels
Cover panels allow access to the internal components of the unit.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
To avoid possible personal injury or death, the access door locking mechanism must be
re-engaged after access to a compartment for inspection or service requirements.
Failure to follow these instructions will result in death or serious injury.
Uniflair LE Direct Expansion Installation Manual
11
Internal Components
Downflow units (TDAV1121 shown)
na4702a
NOTE: The following figure is shown as an example and may not represent the customer model.
Item











12
Description
Electrical panel
Fan
Brazed plate heat exchanger
Filter drier
Liquid receiver
Compressor
Junction box
Humidifier
Electric reheat
Filter
Coil
Uniflair LE Direct Expansion Installation Manual
Upflow units (TUAV1121 shown)
na4828a
NOTE: The following figure is shown as an example and may not represent the customer model.
Item













Description
Fan
Electrical panel
Brazed plate heat exchanger
Filter drier
Relief valve
Liquid receiver
Junction box
Humidifier
Actuator
Compressor
Filter
Coil
Electric reheat
Uniflair LE Direct Expansion Installation Manual
13
Cooling circuit (TDAV1121 shown)
na4715a
NOTE: The following figure is shown as an example and may not represent the customer model.
Item












Description
High pressure switch
Electronic expansion valve
Service valve
Refrigerant level sight glass
Isolation valve
Liquid line solenoid valve
Pressure relief valve
Refrigerant liquid line connection
Refrigerant hot gas discharge connection
Liquid line filter
Receiver
Compressor
Electrical panel door
DANGER
HAZARD OF ELECTRIC SHOCK.
To avoid possible personal injury or death, the access door locking mechanism must be
re-engaged after access to a compartment for inspection or service requirements.
Failure to follow these instructions will result in death or serious injury.
14
Uniflair LE Direct Expansion Installation Manual
na4734a
Electrical panel
Item













Description
Main disconnect switch
Clogged filter switch
Air flow switch
Circuit protectors (overload cutouts, fans, and compressors)
Circuit relays (fan, compressor, humidifier, and heater)
Voltage setting switch
Terminal block
Compressor contactor
Transformer
Display Interface module
Terminal block
Humidifier controller module
Microprocessor controller
NOTE: The location of components in the electrical panel depends on the unit type and configuration.
Uniflair LE Direct Expansion Installation Manual
15
Brazed plate heat exchanger


na3916a

Item Number Item



16
Brazed plate heat exchanger (water-cooled units only)
Input water circuit
Output water circuit
Uniflair LE Direct Expansion Installation Manual
Installation
Site Preparation
NOTICE
EQUIPMENT DAMAGE RISK
Install the unit in an area that is protected from adverse conditions.
Failure to follow these instructions can result in equipment damage.
NOTICE
RISK OF SPILLAGE
Installing the unit on an uneven surface may result in overflow spilling from the
condensate tray.
Failure to follow these instructions can result in equipment damage.
Access and clearance requirements
The area of installation must follow these requirements:
• Minimum floor stand height requirement is 203.2 mm (8 in.) for downflow units.
• Front of unit must have a minimum of 700 mm (28 in.) service clearance.
• Air intake and discharge connections must not be blocked.
• Unit must be installed on a flat, level surface.
na4685a
700 mm (28 in.)
Uniflair LE Direct Expansion Installation Manual
17
Power supply requirements
Review the electrical rating label on the equipment to determine the maximum current draw of the equipment.
WARNING
ALL EQUIPMENT MUST BE GROUNDED
• Verify all equipment is grounded.
• Electrical service must conform to national and local electrical codes and regulations.
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
Humidifier and drain requirements
If a humidifier is installed, the unit requires a potable cold water supply. Condensate must be removed by a
gravity drain using proper P-traps, or by an optional condensate pump.
For inlet water requirements for proper operation, see “Humidifier connections” on page 38.
Installation Types
Downflow units are designed for installation on raised access flooring using appropriate floor stands—or in nonraised floor environments on a provided sub-base discharge plenum supplied by Schneider Electric.
NOTE: Upflow units with air intake through the rear or front can also be installed on floors that are not raised
(these systems require a sub-base or floor-stand).
Installation on non-raised flooring
Installation on non-raised flooring without using floorstands is only allowable on upflow models with rear or front
air return. For installations without raised floors, a sub-base is required for routing piping and electrical wiring to
unit.
Installation on raised access flooring
Installation on raised access flooring requires the support of a floor stand beneath the unit. The floor stand
allows installation of the unit before the raised floor is installed, increases absorption of noise and vibrations,
and facilitates connection of pipes and cables. Use a vibration pad under each leg to reduce vibration.
Floor stand installation
Using the floor stand, position the unit on the mounting frame and secure it using the M8 screw inserts found on
the base of the unit.
For details about floor stand installation, see Uniflair LE Accessories Manual.
NOTE: Install a flexible seal (field supplied) at least 5 mm (0.2 in.) thick between the raised floor panels and
the mounting frame, which should also be isolated from the metallic floor structure.
18
Uniflair LE Direct Expansion Installation Manual
na4720a
NOTE: The minimum raised floor height is 203.2 mm (8 in.).
Item
Description




Cooling unit
Flexible seal
Raised floor
Floor stand
Uniflair LE Direct Expansion Installation Manual
19
Opening the Door and Removing the Front Panels
WARNING
ELECTRCIAL HAZARD
Before servicing, disconnect the power supply.
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
WARNING
HEAVY EQUIPMENT
The panels are heavy. Use extreme caution when moving.
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
Main disconnect switch
na4686a
Each unit is provided with an external pistol handle main switch with an interlocking door. The main switch is
positioned below the touch screen display.
20
Uniflair LE Direct Expansion Installation Manual
Opening the door
1. Turn the unit disconnect handle to the OFF position before opening the front panel.
2. Push the button and pull the handle gently outwards.
na4717a
3. Turn the handle downwards until the door opens.
Removal
1. Firmly hold the panel at the top and pull straight out.
2. Lift and incline the panel outwards until it is completely removed.
na4725a
PANEL
MOUNTING
NOTE: After removing the side panels, a protective internal panel blocks access to the inside of the unit.
Uniflair LE Direct Expansion Installation Manual
21
Internal Protection and Rear Panels
The mechanical compartment, the electric heaters (if present), and the humidifier (if present) are protected by
internal protection panels for safety reasons and to allow the opening of the external panels without triggering
the safety alarms.
WARNING
ELECTRICAL HAZARD
Do not remove rear panels if the equipment is operating.
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
NOTE: Both the internal and the rear panels are fastened to the unit by screws.
NOTE: For rear return units, the rear panels are removed like the front panels.
Removal
1. Loosen the screws securing the panel.
2. Firmly hold the panel.
na4724a
3. Incline the panel outwards until it is completely removed.
22
Uniflair LE Direct Expansion Installation Manual
Unit Connections
Electrical Connections
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Turn off all power supplying this equipment before working on the equipment. All electrical
work must be performed by licensed electricians. Practice Lockout/Tagout procedures.
Do not wear jewelry when working with electrical equipment.
Failure to follow these instructions will result in death or serious injury.
WARNING
QUALIFIED PERSONNEL ONLY
• Electrical connections from the unit to the power supply must ONLY be made by a
licensed electrician.
• Electrical lines must be installed in compliance with all local and national codes.
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
NOTE: Air-cooled units are pressure activated. Low voltage connections between indoor unit and condenser
are not required.
Connecting power to the unit
1. Use suitable equipment to check the grounding system efficiency.
2. Ensure that the facility voltage and frequency correspond to those of the unit name plate.
3. Ensure the main disconnect switch is in the OFF position. See “Main disconnect switch” on page 20
4. If locked, press the button on the door latch and rotate the handle downward to open the door.
Uniflair LE Direct Expansion Installation Manual
23
5. Remove the cover from the main field wiring junction box.
NOTE: Some units are ordered with Short Circuit Current Rating (SCCR) junction boxes.
L1 L2 L3
JUNCTION
BOX
GND
na4832a
STANDARD WIRING CONNECTIONS
GND
CUSTOMER POWER SOURCE
FACTORY-WIRED
L1 L2 L3
SCCR WIRING CONNECTIONS
6. See the wiring diagram attached to the equipment and connect the building power supply line to the
terminal block inside the junction box.
Setting the unit power supply voltage
1. Verify that the appropriate voltage is set according to the nominal line voltage of the main input power
supply.
230V
460V
480V
575V
600V
na4764a
208V
24
Uniflair LE Direct Expansion Installation Manual
2. If necessary, modify the voltage on the selector.
WARNING
MOVING PARTS
Do not operate unit with panels removed.
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
Network Connections
The microprocessor controller connects through the interface module to the Network Management Card
(NMC), which is embedded in the touch display. The following connections are established at installation.
TOP VIEW
A-LINK
(NOT USED)
SIGNAL
(FACTORY WIRED)
POWER
(FACTORY WIRED)
na4843a
INTERFACE MODULE
LOCATION
HDMI PORT
FOR DISPLAY CABLE
(FACTORY WIRED)
24VAC
A-Link
Com D1+D0Modbus
Display Interface
Network
Display
na4831a
RJ-45 PORT
FOR CUSTOMER NETWORK CABLE
BOTTOM VIEW
NOTE: Location of the interface module depends on type and model.
Uniflair LE Direct Expansion Installation Manual
25
Drain Connections
The condensate water drains from the tray through a 32 mm (1 1/4 in.) flexible tube fitted in the unit.
If the unit is equipped with a humidifier, ensure the humidifier connection is connected to the building drain.
See “Humidifier connections” on page 38 for information about connecting to building drains on units
with a humidifier.
Connecting to building drains (without humidifier)
na4737a
2.5 cm PER 2.1 m
(1 in. PER 10 ft)
Item



Description
Drain
Trap
Minimum slope
NOTICE
COMPLIANCE REQUIREMENT
The installation must comply with local plumbing codes.
Failure to follow these instructions can result in equipment damage.
1. Connect the unit drainage tube to the building drains using a rubber or plastic tube with a 1 in. (25.4 cm)
internal diameter.
2. Use a trap on the external drainage tube in order to avoid unpleasant odors and to allow the condensate
pan to drain properly. Consult local building codes for drain requirements.
3. Once the connections have been made, pour water into the condensate drain until the trap inside the
unit is full.
26
Uniflair LE Direct Expansion Installation Manual
Pressure Relief Valve
All DX units have a factory-installed pressure relief valve on the receiver. The pressure relief valve allows
refrigerant to discharge during a fire or any situation that would result in the refrigerant system pressure
exceeding the pressure rating of the relief valve. The pressure relief valve must be piped to the outside ambient
air. When piping the valve, use Type L grade copper tubing (not supplied) and leave the exterior end open to
the atmosphere and pointed away from any people or equipment. For details, consult local and national codes.
na5013a
OUTLET
PRESSURE
RELIEF VALVE
UNIT FLOOR
CUT-OUTS
FOR ROUTING
PIPE
LIQUID
RECEIVER
Uniflair LE Direct Expansion Installation Manual
27
Refrigerant Piping Connections
Air-cooled DX units must be connected to a remote outdoor condenser. Systems with remote outdoor
condensers must have discharge and liquid lines from the equipment to the condenser.
NOTE: Install all refrigerant lines in accordance with applicable industry guidelines as well as local and
national codes and regulations.
General guidelines
• All refrigerant piping is type L ACR hard drawn copper pipes (soft copper is unacceptable).
• All refrigerant lines/chilled water piping are free from debris.
• All refrigerant lines should be as short and direct as possible.
• All refrigerant piping joints must be made by brazing only; do not solder.
NOTE: The recommended brazing alloy is AWS A5.8 BCuP-5.
• All refrigerant pipes are installed with proper supports and approved refrigerant line clamps.
NOTICE
QUALIFIED PERSONNEL ONLY
• The laying the lines and the refrigerant connections must be performed by a qualified
technician.
• All lines must be properly supported, insulated and isolated to avoid premature joint
failures due to system vibrations.
Failure to follow these instructions can result in equipment damage.
NOTE: Isolate piping from structural surfaces using proper refrigeration/AC vibration clamps.
NOTE: When brazing field-installed copper refrigeration lines, use a nitrogen purge to minimize contamination
of the refrigeration system during the brazing process.
Equivalent line length of fittings
Use the following table for reference when determining the total equivalent length of a pipe route.
Type of Fitting/Valve—Equivalent Length of Pipe – m (ft)
28
ACR Tubing Size – mm (in.)
Standard
Elbow 45°
Standard
Elbow 90°
Long Radius
Elbow 90°
Reduced
Coupling
Side Outlet
T
15.88 (5/8)
0.24 (0.8)
0.49 (1.6)
0.30 (1.0)
0.49 (1.6)
0.91 (3.0)
19.06 (3/4)
0.26 (0.9)
0.55 (1.8)
0.36 (1.2)
0.55 (1.8)
1.07 (3.5)
22.23 (7/8)
0.27 (0.9)
0.61 (2.0)
0.42 (1.4)
0.61 (2.0)
1.22 (4.0)
28.58 (1 1/8)
0.39 (1.3)
0.79 (2.6)
0.51 (1.7)
0.79 (2.6)
1.52 (5.0)
Uniflair LE Direct Expansion Installation Manual
Discharge line sizing
WARNING
HIGH TEMPERATURE RISK
Discharge lines must be insulated where contact could be made to avoid a contact burn.
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
Discharge lines must be sized such that refrigerant velocity in vertical lines is between 5 m/s (1000 ft/min) and
15 m/s (3000 ft/min). Refrigerant velocity in horizontal lines should be a minimum of 2.5 m/s (500 ft/min).
Refrigerant velocity must be high enough to keep oil entrained to ensure the proper flow of oil throughout the
system, in particular when operating at a partial load. If refrigerant velocity is too low, oil will not return to the
compressor. If the refrigerant velocity is too high, both the noise level and pressure drop will increase. The
acceptable pressure drops in discharge lines are up to 68.9 kPa (10 psi).
NOTE: Give consideration to the full and half load (or tandem) of the compressor to ensure that the operational
range stays within these limits.
Horizontal discharge lines must be pitched downward at a minimum of 25.4 mm per 3048 m (1 in. per 10 ft) to
ensure proper oil return.Trap the discharge line at the base of the vertical riser to prevent oil from returning back
to the compressor during shutdown periods.
25.4 mm
PER 3048 m
(1 in. PER 10 ft)
25.4 mm PER 3048 m
(1 in. PER 10 ft)
5 m (16 ft)
MAXIMUM
25.4 mm PER 3048 m
(1 in. PER 10 ft)
15 m (50 ft)
MAXIMUM
na3925a
5 m (16 ft)
MAXIMUM
Uniflair LE Direct Expansion Installation Manual
29
Calculating total discharge line size
Use the following guidelines to determine the diameter of pipe:
• Use the formula:
Total equivalent length = Vertical line length + Horizontal line length + Equivalent length of fittings
NOTICE
MAXIMUM DISTANCE REQUIREMENT
• Total equivalent length should not exceed 40 m (130 ft).
• For line lengths greater than 40 m (130 ft), contact Schneider Electric.
Failure to follow these instructions can result in equipment damage.
• For pipes running in a downward vertical direction, select pipe size from the
horizontal sizing table.
Discharge line size—vertical
• Calculate equivalent discharge line length in vertical direction.
• Use the table below to determine pipe diameter for vertical pipes.
Model
Equivalent length–m (ft)
0511
0611
0921
1121
1422
1622
1822
2242
2542
2842
3342
8 (25)
5/8 in.
5/8 in.
5/8 in.
5/8 in.
5/8 in.
5/8 in.
3/4 in.
15 (50)
5/8 in.
5/8 in.
3/4 in.
5/8 in.
5/8 in.
3/4 in.
3/4 in.
NOTE: Equivalent length in vertical direction cannot exceed 15 m (50 ft).
Discharge line size—horizontal
• Calculate equivalent discharge line length in horizontal direction.
• Use the table below to determine pipe diameter for horizontal pipes.
Model
Equivalent length–m (ft)
0511
0611
0921
1121
1422
1622
1822
2242
2542
2842
3342
15 (50)
7/8 in.
5/8 in.
7/8 in.
7/8 in.
7/8 in.
7/8 in.
7/8 in.
30 (100)
7/8 in.
3/4 in.
7/8 in.
7/8 in.
7/8 in.
7/8 in.
7/8 in.
40 (130)
7/8 in.
3/4 in.
7/8 in.
7/8 in.
7/8 in.
7/8 in.
1 1/8 in.
NOTE: Equivalent length in horizontal direction cannot exceed 40 m (130 ft).
30
Uniflair LE Direct Expansion Installation Manual
Liquid line sizing
Liquid lines must be sized to ensure sufficient refrigerant flow to the expansion device and to minimize pressure
drop.
NOTE: Excessively long liquid lines should be insulated from high ambient temperatures.
Model
Equivalent Length–m (ft)
0511
0611
0921
1121
1422
1622
1822
2242
2542
2842
3342
15 (50)
5/8 in.
5/8 in.
5/8 in.
5/8 in.
5/8 in.
5/8 in.
5/8 in.
30 (100)
5/8 in.
5/8 in.
5/8 in.
5/8 in.
5/8 in.
7/8 in.
7/8 in.
40 (130)
5/8 in.
5/8 in.
7/8 in.
5/8 in.
5/8 in.
7/8 in.
7/8 in.
Refrigeration circuits
WARNING
QUALIFIED PERSONNEL ONLY
Charging and maintaining the refrigeration circuit must only be performed by qualified
personnel.
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
The refrigeration circuit from the factory is pre-charged with nitrogen. Prior to evacuation, a gross pressure test
should be performed to identify any leaks.
Gross pressure test
1. Open any shut-off valves present in the system to ensure that all of the components will be tested.
2. Pressurize the system to 17.2 bar (250 psi) with nitrogen.
3. Leave the system pressurized for 24 hours.
4. After 24 hours, verify that no drop in pressure has occurred.
After verifying the absence of leaks from the system, perform the system evacuation.
System evacuation
1. Open any shut-off valves present in the system to ensure that all of the components will be evacuated.
2. Connect a vacuum pump to the service ports on the system piping. Using a core removal tool may
reduce the time of the evacuation.
3. Pull the first vacuum down to 750 microns, then isolate the system from the vacuum pump.
4. Wait for an hour and check vacuum level. The vacuum should not rise above 1500 microns; if vacuum
level exceeds this level, check system for leaks.
5. Break the vacuum with nitrogen.
6. Pull a final vacuum to below 500 microns. With the system isolated from the vacuum pump the system
should not rise above 500 micron for a minimum of 2 hours.
NOTE: Install a ball valve before the micron gauge to prevent damage to the micron gauge during
charging.
7. After completing the vacuum seal, charge the system with refrigerant.
Uniflair LE Direct Expansion Installation Manual
31
Refrigerant charging
1. Calculate the total charge needed, using the reference table and formula:
Indoor Unit Charge + Liquid Line Charge + Condenser Charge = Total Charge
Air-Cooled DX Indoor Unit Charge per Circuit – kg (lb)
Twin-Cool with Air Cooled DX Indoor Unit Charge per Circuit – kg (lb)
DX
Model
Circuit 1
(No Hot Gas Reheat),
Circuit 2
Circuit 1
(with Hot Gas Reheat),
Circuit 2
Circuit 1
(No Hot Gas Reheat)
Circuit 2
Circuit 1
(No Hot Gas Reheat),
Circuit 2
0511
3 (6.6)
3.1 (6.8)
2.9 (6.4)
3.0 (6.6)
3.0 (6.6)
0611
2.9 (6.4)
3.1 (6.8)
2.9 (6.4)
0921
3.1 (6.8)
3.2 (7.0)
3 (6.6)
3.2 (7.0)
1121
3.3 (7.3)
3.5 (7.7)
3.2 (7.0)
3.4 (7.5)
1422
3.1 (6.8)
3.3 (7.3)
3.1 (6.8)
3.3 (7.3)
1622
3.1 (6.8)
3.3 (7.3)
3.1 (6.8)
3.3 (7.3)
1822
3.1 (6.8)
3.3 (7.3)
3.1 (6.8)
3.3 (7.3)
2242
6.4 (14.1)
6.7 (14.7)
6.1 (13.4
6.5 (14.3)
2542
6.3 (13.9)
6.7 (14.7)
6.1 (13.4)
6.5 (14.3)
2842
N/A
N/A
6.5 (14.3)
6.9 (15.2)
3342
6.6 (14.5)
7 (15.4)
N/A
N/A
Liquid Line Refrigerant Charge
Size – in.
Amount – kg/m (lb/ft)
5/8
0.16 (0.11)
7/8
0.33 (0.22)
Condenser Charge = Summer Charge + Additional Flooded Charge (if Low Ambient Kit is installed)
SchneiderElectric
Condenser
Model
Luvata
Condenser
Model
Summer
Charge per
Circuit
kg (lb)
Additional Flooded Charge per Circuit – kg (lb)
Different Minimum Ambient Temperatures if Low Ambient Kit is Installed
4°C (40°F)
-7°C (20°F)
-18°C (0°F)
-29°C (-20°F)
-40°C (-40°F)
ACCD76050
ACCD76061
ACCD76072
LCS5011-024-2C
LCS5011-024-4C
LCS5011-024-4C-575
1.24 (3.1)
0.8 (1.7)
0.8 (1.7)
1.0 (2.1)
1.0 (2.2)
1.1 (2.4)
ACCD76051
ACCD76062
ACCD76073
LCS5011-032-2C
LCS5011-032-4C
LCS5011-032-4C-575
2.0 (4.5)
1.3 (2.8)
1.3 (2.8)
1.5 (3.2)
1.5 (3.3)
1.6 (3.6)
ACCD76052
ACCD76063
ACCD76074
LCS5011-039-2C
LCS5011-039-4C
LCS5011-039-4C-575
2.8 (6.1)
0.9 (1.9)
0.9 (1.9)
1.0 (2.1)
1.0 (2.2)
1.1 (2.4)
ACCD76053
ACCD76064
ACCD76075
LCS5012-051-2C
LCS5012-051-4C
LCS5012-051-4C-575
3.0 (6.6)
1.0 (2.2)
1.0 (2.2)
1.2 (2.6)
1.2 (2.6)
1.3 (2.8)
ACCD76054
ACCD76065
ACCD76076
LCS5212-067-2C
LCS5212-067-4C
LCS5012-051-4C-575
2.1 (4.7)
1.3 (2.9)
1.3 (2.9)
1.6 (3.4)
1.6 (3.4)
1.7 (3.7)
ACCD76055
ACCD76066
ACCD76077
LCS5012-079-2C
LCS5012-079-4C
LCS5012-051-4C-575
2.9 (6.3)
1.7 (3.8)
1.7 (3.8)
2.0 (4.4)
2.0 (4.5)
2.2 (4.9)
ACCD76056
ACCD76067
ACCD76078
LCS5213-099-2C
LCS5213-099-4C
LCS5012-051-4C-575
3.0 (6.7)
1.9 (4.1)
1.9 (4.1)
2.1 (4.7)
2.1 (4.7)
2.4 (5.3)
ACCD76057
ACCD76068
ACCD76079
LCS5213-113-2C
LCS5213-113-4C
LCS5012-051-4C-575
4.1 (9.0)
2.4 (5.4)
2.4 (5.4)
2.9 (6.3)
2.9 (6.4)
3.2 (7.0)
ACCD76058
ACCD76069
ACCD76080
LCS8212-015-2C
LCS8212-015-4C
LCS5012-051-4C-575
4.2 (9.3)
2.6 (5.7)
2.6 (5.7)
3.0 (6.7)
3.0 (6.7)
3.3 (7.2)
ACCD76059
ACCD76070
ACCD76081
LCS8012-018-2C
LCS8012-018-4C
LCS5012-051-4C-575
5.4 (11.8)
3.7 (8.2)
3.7 (8.2)
4.2 (9.3)
4.2 (9.3)
4.7 (10.3)
ACCD76060
ACCD76071
ACCD76082
LCS8013-022-2C
LCS8013-022-4C
LCS5012-051-4C-575
7.4 (16.4)
8.2 (18.0)
8.2 (18.0)
9.1 (20.0)
9.6 (21.1)
10.5 (23.1)
2. Connect the refrigerant cylinder to the service ports.
3. Break the vacuum by charging with liquid R410A.
NOTE: Charge R410A as a liquid only.
32
Uniflair LE Direct Expansion Installation Manual
4. Charge to 80% of the calculated total.
NOTE: If the system is not ready for commissioning, then apply only a holding charge and record the
amount charged.
5. Start the compressor, and complete the charging process.
NOTE: Perform a slow charge to avoid compressor damage.
Water Piping Connections
For all water connections (except for the condensate drain):
1. Use shutoff valves (not supplied) to isolate the unit from the water circuit. If possible, use full port ball
valves to minimize the pressure drop.
2. Check that the water pipe sizes and the circulating pump quality are adequate; insufficient water flow
affects unit performance.
3. Check that the water flow directions are verified and connected properly between the unit and building.
NOTE: Assure that all pipes are free of debris and assure all system strainers are in place and oriented in
the correct direction.
4. Insulate all water pipes with closed cell insulating material avoiding air gaps (for example: Armaflex™ or
equivalent) to avoid condensation. The insulation must allow accessibility to the valves and three-piece
joints.
5. Check that the water circuits are supplied with a maximum water pressure of 2068 kPa (300 psi). Install
a safety valve with a setpoint of no more than 2068 kPa (300 psi).
NOTICE
DRAINAGE REQUIREMENT
Draining the unit is recommended after prolonged inactivity.
na4761a
Failure to follow these instructions can result in equipment damage.
IN
Uniflair LE Direct Expansion Installation Manual
OUT
33
Filling the Chilled Water Circuit
NOTE: The water used to fill the chilled water circuit must be filtered with a minimum 20 mesh stainless steel
screen.
NOTICE
CHILLED WATER CIRCUIT REQUIREMENT
Filling the chilled water circuit must be done by a qualified mechanical contractor.
Failure to follow these instructions can result in equipment damage.
1. Before use, disconnect the power supply.
2. Clean the primary circuits before filling the units (a particulate strainer should be installed in the supply
water piping within close proximity to the unit).
3. Check that all unit bleed valves are closed.
na4984a
BLEED
VALVES
NOTE: The location of bleed valves depends on the unit type and frame size.
4. Open the isolation valves (field installed).
5. Open the bleed valve and wait for the water to come out.
6. Close the valve once all air is removed.
7. Repeat step 5 and step 6, if necessary, to remove all air.
34
Uniflair LE Direct Expansion Installation Manual
Energy Saver Units
Setup
Energy Saver units are connected to an outside fluid cooler and a pump. If the ambient temperature reaches
the established setpoint, energy saving mode is activated. Whenever the difference between the room
temperature and the ambient temperature is at least a 9°C (16°F), the fluid cooler will operate in winter mode
with a 7.2°C (45°F) setpoint.
na4750a
FACTORY SUPPLIED WIRING
Item




Description
Pump package
Fluid cooler
Ambient temperature sensor
Electrical panel
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Turn off all power supplying this equipment before working on the equipment. All electrical
work must be performed by licensed electricians. Practice Lockout/Tagout procedures.
Do not wear jewelry when working with electrical equipment.
Failure to follow these instructions will result in death or serious injury.
NOTE: Use only fluid-coolers and pump packages supported by Schneider-Electric.
NOTE: Use only #18 AWG for electrical connections from the unit to the fluid cooler and pump package.
NOTE: Maximum recommended distance to electrical connections from the unit to the fluid cooler and pump
package is 152.4 m (500 ft).
NOTE: For cooling applications with multiple units and fluid coolers in a common loop, contact Technical
Support for the appropriate interconnection wiring diagram.
Uniflair LE Direct Expansion Installation Manual
35
Installation
1. Install the outside ambient temperature sensor (stored inside the electrical panel) to an appropriate
location, carefully routing the shielded cable.
NOTE: Maximum distance between the unit and the outdoor sensor is 30.5 m (100 ft).
2. Install water piping to the cooler and pump.
3. Connect the wires from the fluid cooler the terminal block on the unit.
INSIDE
INDOOR
UNIT
970
960
LEAVING
WATER
TEMPERATURE
SENSOR
C450RCN-1C
Sn2
960
24V
C
R2
Sn3
Sn1
LC2
LNC2
LNO2
LC1
LNO1
LNC1
na4751a
MASTER
SENSOR
5V
C
R1
970
C
4. Secure the leaving water temperature sensor to the pipe with clamps, and wrap the sensor with ultra
violet resistant insulation.
INSIDE
INDOOR
UNIT
53
63
5. Connect the wires from the pump package to the terminal block on the unit.
TO TERMINAL
BLOCK 53
INDOOR UNIT
TO TERMINAL
BLOCK 63
INDOOR UNIT
20
36
na4756a
21
CR5
Uniflair LE Direct Expansion Installation Manual
Accessories
Humidifier
na4736a
Components
Item




Description
Steam outlet
Supply water fill cup
Humidifier cylinder
Water supply solenoid valve
Uniflair LE Direct Expansion Installation Manual
Item




Description
Water supply connections
Water drain connection
Cylinder drain solenoid valve
Condensate drain pan hose
37
Humidifier connections
The humidifier installation requires connection to the water supply and drain lines.
NOTE: A factory-supplied threaded adapter and rubber hose are used to connect the humidifier to the piping on
site.
na4749a
5°
MINIMUM
Item




Description
Drain line
Trap
Replaceable water cartridge filter (recommended)
Isolation valve
Connecting to the drainage and water supply lines
WARNING
HOT WATER HAZARD
• Use caution when servicing the humidifier. The water discharged from the humidifier is at
a very high temperature.
• Use a drainage tube designed to withstand temperatures of at least 100°C (212°F).
• Keep the drainage tube away from all electrical cables and refrigerant lines.
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
1. Route the humidifier drainage line to the building drains using a rubber or plastic tube with a 1 1/4 in.
internal diameter.
2. Use a trap on the external drainage tube to avoid unpleasant odors and water overflow from the
humidifier tray. Consult local building codes for drain requirements.
3. Connect humidifier 3/4 in. hose bib connection to water supply line.
4. Once the connections have been made, pour water into the unit condensate collection tray and in the
humidifier condensate collection tray until the trap is full.
38
Uniflair LE Direct Expansion Installation Manual
Supply water
Use the values in the following table to determine the conductibility of the humidifier supply water.
NOTE: The recommended supply water pressure should be between 30–90 psig.
Limits
Description
Units
Hydrogen ion activity
Specific conductibility at 20°C (68°F)
pH
Minimum
Maximum
7
8.5
σ R, 20°C (68°F)
μS/cm
300
1250
Total dissolved solids
TDS
mg/l
( 1)
(1 )
Residual fixed at 180°C (356°F)
R180
mg/l
( 1)
(1 )
TH
mg/l
100(2)
400
mg/l
60(3)
300
mg/l Fe + Mn
0
0.2
ppm Cl
0
30
Silica
mg/l
0
20
Residual chloride
mg/l
0
.2
Calcium sulphate
mg/l
0
100
Metallic impurities
mg/l
0
0
Solvents, diluents, soaps, lubricants
mg/l
0
0
Total hardness
Temporary hardness
Iron + manganese
Chlorides
(1) Values dependent on the specific conductibility; in general: TDS @ 0.93 * s20; R180 @ 0.65 * s20
(2) Not lower than 200% of the Chloride content in mg/l di Cl(3) Not lower than 300% of the Chloride content in mg/l di Cl-
Uniflair LE Direct Expansion Installation Manual
39
Temperature and Humidity Sensor
Installation
1. Insert a screwdriver in the slot and release the front cover of the sensor.
2. Remove the lid and fasten the screws inside the sensor to the mounting location on the unit.
na4730a
3. Connect the shielded cable to the appropriate terminals on the sensor, using the electrical diagram in
the unit as reference.
NOTE: Some cooling applications may require the sensor be mounted in the room apart from the unit. The
recommended maximum distance between the sensor and the unit is 3 m (10 ft). Use only #18 AWG.
NOTICE
ELECTRIC STATIC DISCHARGE (ESD)
Apply ESD protection when handling the installed sensor.
Failure to follow these instructions can result in equipment damage.
40
Uniflair LE Direct Expansion Installation Manual
Worldwide Customer Support
Customer support for this or any other product is available at no charge in any of the following ways:
• Visit the Schneider Electric Web site to access documents in the Schneider Electric Knowledge Base
and to submit customer support requests.
– www.schneiderelectric.com (Corporate Headquarters)
Connect to localized Schneider Electric Web sites for specific countries, each of which provides
customer support information.
– www.schneiderelectric.com/support/
Global support searching Schneider Electric Knowledge Base and using e-support.
• Contact the Schneider Electric Customer Support Center by telephone or e-mail.
– Local, country-specific centers: go to www.schneiderelectric.com > Support > Operations
around the world for contact information.
For information on how to obtain local customer support, contact the representative or other distributors
from whom you purchased your product.
As standards, specifications, and designs change from time to time, please ask for confirmation of the information given in this publication.
© 2014 Schneider Electric. All Rights Reserved.
Uniflair and the Schneider Electic logo are trademarks owned by Schneider Electric Industries SAS S.A.S., or its affiliated companies. All other
trademarks are the property of their respective owners.
990-4482B-001
6/16/14