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T7771A
Remote Temperature Sensor
PRODUCT DATA
FEATURES
• Pushbutton setpoint adjustment with LED indicators.
• Occupied/unoccupied override (bypass) with LED.
• LONWORKS® bus jack.
• Operating range 45 to 99°F (7 to 37°C).
GENERAL
The T7771A Remote Temperature Sensors are direct wired
wall modules for use with the Honeywell T7350 Commercial
Programmable Thermostat. The T7771A has a space
temperature sensor, LED pushbutton setpoint adjustment, and
override with LED.
IMPORTANT
• The T7771 compatibility with the T7350 only applies
to T7350 models with date code 0423 or later.
• To ensure the purchase of a compatible T7350, order
either:
— Y7355B1002 (consisting of: T7350B Thermostat,
T7771A and C7041B Sensors).
— Y7355D1008 (consisting of: T7350D Thermostat,
T7771A, C7041B Sensors).
SPECIFICATIONS
Construction: Two-piece construction, cover and internally
wired subbase. Field wiring 14 to 22 AWG (2.0 to 0.34
sq. mm) connects to a terminal block in the subbase. Wall
module is activated by plugging into prewired subbase.
Relative Humidity: 5% to 95% noncondensing.
Mounting Options:
The T7771 can be mounted on a standard two by four inch
junction box or on a 60 mm diameter junction box.
Temperature Sensor Accuracy
Dimensions (H/W/D):
5-1/16 x 3-1/8 x 1 in. (128 x 80 x 25 mm).
Setpoint Adjustment:
The setpoint offset allows for ±3°F from the programmed
T7350 setpoint.
Environmental Ratings:
Operating Temperature: 45° to 99°F (7° to 37°C).
Shipping Temperature: -40° to 150°F (-40° to 65°C).
® U.S. Registered Trademark
© 2004 Honeywell International Inc.
All Rights Reserved
Temperature Sensor Operating Range:
45 to 99°F (10 to 37°C).
T7771A 20K Ohm Nonlinearized Sensor:
All T7771 models are furnished with a 20K Ohm nonlinear
NTC temperature sensor that follows a specific
temperature-resistance curve. See Fig. 1.
Sensor accuracy at 77°F is ±0.36°F (±0.2°C)
See form 63-7074 for detailed nominal temperature resistance
output in table form.
NOTE: In addition, a jumper allows for 10K Ohm output to
accommodate using multiple sensors for temperature
averaging applications with the T7350 Commercial
Thermostat. See the Wiring section for details.
63-2617
T7771A REMOTE TEMPERATURE SENSOR
80K
RESISTANCE (OHMS)
70K
T7771A
60K
STEP 1
50K
Te
m
40K
Co
pe
ole
ratu
re
No
rm
r
Co
ntr
al
W
arm
30K
20K OHM AT
77oF (25oC)
20K
ol
er
O
n/O
ff
10K
30
0
40
50
10
60
70
20
80
90
30
TEMPERATURE (DEGREES)
100
110 oF
o
40
C
M22172
M5874A
STEP 2
Fig. 2. Cover disassembly.
Fig. 1. Temperature vs. resistance for nonlinear sensor.
Communications:
Includes a LONMARK® bus communications port. If needed,
the jack plug must be removed in the field, and terminals 1
and 2 wired according to the installation instructions to minimize installation errors due to miswiring.
The recommended wire size for the LONMARK® bus is
Level IV, 22 AWG (0.34 sq.mm) plenum or non-plenum
rated, nonshielded, twisted pair, solid conductor wire.
Wall Module Bypass Override/LED Operation
When the T7771 override button is pushed, the T7350 setting
changes to Temporary Occupied. If pressed again, the T7350
setting changes back to Occupied. The override button has no
effect when the T7350 programmed setting is already
Occupied.
CAUTION
Erratic System Operation Hazard.
Failure to follow proper wiring practices can
introduce disruptive electrical interference (noise).
Keep wiring at least one foot away from large inductive
loads such as motors line starters, lighting ballasts,
and large power distribution panels.
Shielded cable is required in installations where these
guidelines cannot be met.
Ground shield only to grounded controller case.
IMPORTANT
All wiring must comply with local electrical codes
and ordinances or as specified on installation
wiring diagrams.
— Wall module wiring can be sized from 14 to 22 AWG
(2.0 to 0.34 sq mm) depending on the application.
— The maximum length of wire from a device to a wall
module is 1000 ft (305m).
— Twisted pair wire is recommended for wire runs longer than
100 ft (30.5m).
— The cover for the wall module is packed separately from
the subbase for ease of installation.
BEFORE INSTALLATION
Cover Disassembly
One locking mechanism is used on the wall module cover.
After installation, to disassemble the cover and the subbase
see Fig. 2.
See Fig. 3 to release/replace the subbase terminal block.
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).
2. Honeywell Customer Care
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
63-2617
2
T7771A REMOTE TEMPERATURE SENSOR
STANDARD UTILITY
CONDUIT BOX
PRESS SHADED AREA
OF TAB WITH THUMB TO
RELEASE TERMINAL BLOCK
FOR EASIER WIRING
SUBBASE
NO. 6 SCREW
FRONT COVER
Te
m
M17988
Co
pe
ole
ratu
No
re
rm
r
Co
ntr
ol
al
W
arm
er
Fig. 3. Releasing/replacing terminal block.
O
n/O
ff
INSTALLATION
Te
m
CAUTION
Co
n/O
SUBBASE
ff
M22173
Fig. 5. Mounting wall modules on standard utility
conduit box or 60 mm wall outlet box.
Wiring
Attach the wires from the device sensor terminals to the
appropriate wall module terminals. See Fig. 6.
CAUTION
Improper Electrical Contact Hazard.
Screw type terminal blocks are designed to accept
no more than one 14 AWG (2.5 sq mm) conductor.
Connect multiple wires that are 14 AWG (2.5 sq mm)
with a wire nut. Include a pigtail with this wire group
and attach the pigtail to the individual terminal block.
Wire the terminal blocks as follows:
1. For single wires, strip 3/16 in. (5 mm); for multiple wires
going into one terminal, strip 1/2 in. (13 mm) insulation
from the conductor.
2. If two or more wires are being inserted into one
terminal, twist the wires together before inserting.
5-1/16
(128)
2-3/8
(60)
NOTE: When two or more wires are being inserted
into one terminal, be sure to twist them
together. Deviation from this rule can result
in improper electrical contact. See Fig. 9.
STANDARD
UTILITY
CONDUIT
BOX (2 X 4)
MOUNTING
HOLES
3.
On/Off
4.
2-3/8 (60)
al
ol
FRONT COVER
KNOCKOUTS FOR
EUROPEAN APPLICATIONS
3-3/16 (80)
ntr
3.5 mm SCREW
NOTE: See Fig. 4 for subbase mounting dimensions.
Warmer
rm
60 mm WALL
OUTLET BOX
Co
er
The wall module can be mounted on a wall, on a standard
utility conduit box using No. 6 (3.5 mm) screws or on a 60 mm
wall outlet box (see Fig. 5). When mounting directly on a wall,
use the type of screws appropriate for the wall material.
Cooler
re
r
O
Mount the T7771A Wall Module on an inside wall
approximately 54 in. (1372 mm) from the floor (or in the
specified location) to allow exposure to the average zone
temperature. Do not mount the wall module on an outside
wall, on a wall containing waterpipes or near air ducts. Avoid
locations that are exposed to discharge air from registers or
radiation from lights, appliances, or the sun.
Normal
ole
ratu
No
W
arm
Equipment Damage Hazard.
Electrostatic discharge can short equipment
circuitry.
Ensure that you are properly grounded before
handling the unit.
Touch only the plastic cover, casing, and buttons.
Temperature Control
pe
Insert the wire in the required terminal location and
tighten the screw to complete the termination.
Verify wall module wiring with Fig. 6.
NOTE: Wire the E-Bus using Level IV 22 AWG (0.34 sq mm)
plenum or non-plenum rated, unshielded, twisted
pair, solid conductor wire.
15/16
(23)
M22174
Fig. 4. T7771A Subbase dimensions in in. (mm).
3
63-2617
T7771A REMOTE TEMPERATURE SENSOR
Averaging Multiple Sensors
The default position for the J2 jumper is 20K ohms. When
using a single sensor, leave the jumper in this position.
T7350 SUBBASE
T4
For temperature averaging using a T7350 Commercial
Thermostat and multiple sensors, use the following
guidelines:
— Only one T7771 can be used.
— For the second sensor, use a T7770A3002 (which has a
10K ohm output).
— Wire the two sensors in series.
1
T7771A
T7770A1006
T4
T3
T3
T3
T4
20K OHM
OUTPUT
J2
20K OHM OUTPUT
T7770A1006
T4
J2
T7770A1006
T3
T4
T3
GND
E-BUS
E-BUS
6
SETPT
7
SENSOR
8
STATUS
9
BYPASS
J2
5
4
3
2
1
10K OHM OUTPUT
1 APPROPRIATE T7771A JUMPER POSITION
FOR FOUR SENSOR TEMPERATURE AVERAGING.
M22281
Fig. 8. Temperature averaging with four sensors.
J2
M22175
Fig. 6. Wiring diagram for T7771A Wall Modules.
1/2
(13)
T7350 SUBBASE
T4
(13 MM) FROM
WIRES TO BE
ATTACHED AT
ONE TERMINAL.
CONTROLLER OR
WALL MODULE
E-BUS CONNECTOR
TERMINALS
10K OHM
OUTPUT
T7771A
T7770A3002
T4
1
T3
1. STRIP 1/2 IN.
T3
T3
T4
2. TWIST WIRES
J2
J2
TOGETHER
WITH PLIERS
(A MINIMUM OF
THREE TURNS).
3. CUT TWISTED END OF WIRES TO
3/16 IN. (5 MM) BEFORE INSERTING
INTO TERMINAL AND TIGHTENING
SCREW. THEN PULL ON EACH WIRE
IN ALL TERMINALS TO CHECK FOR
GOOD MECHANICAL CONNECTION.
M11413
1 APPROPRIATE T7771A JUMPER POSITION
FOR TWO SENSOR TEMPERATURE AVERAGING.
M22280
Fig. 7. Temperature averaging with two sensors.
Fig. 9. Attaching two wires at wall module terminals.
When all wiring is complete, attach the cover of the T7771A
Wall Module by reversing step 2 of Fig. 2.
By using this Honeywell literature, you agree that Honeywell will have no liability for any damages arising out of
your use or modification to, the literature. You will defend and indemnify Honeywell, its affiliates and subsidiaries,
from and against any liability, cost, or damages, including attorneys’ fees, arising out of, or resulting from, any
modification to the literature by you.
Automation and Control Solutions
ACS Control Products
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell AG
Böblinger Straße 17
D-71101 Schönaich
Phone (49-7041) 637-01
Fax (49-7041) 637-493
63-2617
B.B. 6-04
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9
www.honeywell.com