Honeywell T775J User Manual
T775J
63-2248-4
Electronic Remote Temperature Controller
PRODUCT DATA
FEATURES
• T775 model provides reset control with two
GENERAL
The T775J family of electronic remote temperature controllers
provides reset control for chillers, heating and cooling
systems, and other applications where electronic accuracy in
addition to remote sensing is desired.
temperature inputs and one of either 4 to 20 mA, 0 to
18 Vdc, or Electronic Series 90
modulating output with 0 or 1 relay output stages, or 1
or 2 relay output stages with no modulation.
• -40°F to +220°F (-40°C to +105°C) setpoint temperature
range.
• -45°F to +225°F (-43°C to +107°C) sensor display
range.
• -30°F to + 140°F (-34°C to +60°C) ambient temperature
range.
• Linear platinum temperature sensor.
• Adjustable temperature range and differential.
• Adjustable throttling range of 2° to 30° F or C.
• Adjustable reset ratio.
• Liquid crystal display (LCD) indication for mode and
output status.
• Keypad provides ease of programming and
operation.
• Accuracy is within +/- 1°F/C at nominal input voltage,
nominal sensor ambient temperature (77°F (25°C)
operating ambient). Accuracy can vary as parameters
deviate from nominal.
• Stages independently programmed for heating or
cooling.
• 24/120/240 Vac voltage inputs.
• Spdt relay outputs.
IMPORTANT
a
The T775 is an operating control, not a limit or safety
control. When used in applications requiring safety
or limit controls, use a separate safety or limit control
device in conjunction with the T775.
The Electronic Series 90 output provided with T775J
models will not drive electromechanical Series 90 slidewire
devices.
a
Proportional + Integral
Copyright © 1995 Honeywell Inc. • All Rights Reserved
Contents
General ............................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 3
Description/Operation ......................................................... 13
Checkout ............................................................................. 18
T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER
SPECIFICATIONS
IMPORTANT
Models (See Table 1):
The T775J family of electronic remote temperature controls
provides reset control for chillers, heating and cooling
systems, and other applications where electronic accuracy in
addition to remote sensing is desired.
T775J provides reset control with
one of either 4 to 20 mA, Electronic Series 90, or 0 to 18 Vdc
Proportional + Integral modulating output with 0 or 1 relay
output stages, or 1 to 2 relay output stages with no
modulation. Includes two part number 193987GA
Sensors.
The specifications given in this publication do not
include normal manufacturing tolerances. Therefore,
an individual unit may not exactly match the listed
specifications. Also, this product is tested and
calibrated under closely controlled conditions and
some minor differences in performance can be
expected if those conditions are changed.
two
temperature inputs and
Table 1. T775J Model Numbers and Outputs.
Outputs
Model
Number
T775J1001 None 1
T775J1019 Series 90 0
T775J1027 4-20 mA 0
T775J1035 0-18 Vdc 0
T775J1043 Series 90 1
T775J1050 4-20 mA 1
T775J1068 0-18 Vdc 1
T775J1076 None 2
Modulation
Type
Number of Relay
Outputs
Electrical Ratings:
Voltage Input: 24/120/240 Vac, 50/60 Hz (+10/-15%).
Power Consumption:
50 Hz: 10 VA maximum.
60 Hz: 8 VA maximum.
Contact Ratings:
1/2 HP: 9.8 FLA, 58.8 LRA at 120 Vac.
1/2 HP: 4.9 FLA; 29;4 LRA at 240 Vac.
125 VA pilot duty at 120/240 Vac.
10A at 24 Vac (resistive).
Temperature Accuracy:
±1° F (0.6° C) (at nominal input voltage, 77°F (25°C)
operating ambient, nominal sensor ambient).
Setpoint Adjustment Range:
-40° F to +220° F
(-40° C to +105° C).
Operating Ambient Temperature:
Controller: -30°F to + 140°F (-34°C to 60°C).
Sensor: -45°F to + 225°F (-43°C to 107°C).
Throttling Range for Modulating Output:
Adjustable 2° to 30° F or C.
Differential Range for Staged Output:
Adjustable 1° to 30° F.
Reset Ratio:
Adjustable between 1 to 30 and 30 to 1.
Operating Humidity:
5 to 95 percent relative humidity, noncondensing.
Sensor:
Positive coefficient platinum type, 4.8 ohms/°F, 1000 feet
maximum distance between sensor and solid state controller
(requires calibration over 400 feet).
Approvals:
Underwriters Laboratories Inc. Listed: File No. E4436.
Guide XAPX.
Canadian Standards Association Certified: File No.
LR47125.
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 .
1. Model Number
2. Accessory
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 Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Logistics
Honeywell Inc., 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.
63-2248—4
2
T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER
Mounting:
Mounts on any suitable horizontal or vertical surface. (See
Fig. 5 for mounting hole locations.)
Dimensions:
See Fig. 1.
Display Resolution:
Sensed temperature and other operating parameters are
displayed via a liquid crystal display (LCD) with a resolution of
1°F or 1°C.
Accessories:
C7100C1003 Duct Mount Averaging Sensor*.
T7047C1090 Wall Mount Sensor Case.
107324A Bulb Holder, duct insertion.
121371A Copper Immersion Well.
121371E Stainless Steel Immersion Well.
107408 Heat Conduction Compound, 4 ounce.
C7043A1098 Case and Immersion Well.
203401B Waterproof Sensor.
203531A Panel Mounting Kit.
A775A1003 Sensor Simulator.
*Use of C7100C1003 decreases accuracy of T775 to ±2°F
(±1°C).
CAUTION
Disconnect power before installation to prevent
electrical shock or equipment damage.
Location and Mounting
Mount the controller in any convenient interior location using
the two mounting holes provided. Mounting screws are not
included. Use controller dimensions in Fig. 1 as a guide.
Sensor Location
The 193987GA Sensor can be used up to 1000 ft (304m)
from the T775 using standard AWG 18/2 unshielded wire. If
longer than 25 feet in an electrically noisy environment, use
shielded cable. Locate the sensor on pipes, in immersion
wells, in wall-mounted cases or on a bulb holder.
Multiple sensors can be parallel-series wired to sense
average temperature in large spaces. In order to maintain
control accuracy, be sure the number of sensors parallelseries wired is of the n2 power (i.e., 1, 4, 9, 16, etc). See
Fig. 2.
SET
SELECT
3-13/16 (97)
4-3/4 (121)
ENTER
5-7/32
(134)
7/8 (22) DIAMETER
8-1/2
(216)
2-3/8 (60)
1-1/4
(32)
1-1/4
(32)
M344C
Fig. 1. Approximate T775J dimensions in in. (mm).
INSTALLATION
When Installing this Product...
쐃 Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
쐇 Check the ratings given in these instructions and on the
product to make sure the product is suitable for your
application.
쐋 Installer must be a trained, experienced service
technician.
쐏 After installation is complete, check out the product
operation as provided in these instructions.
SENSORS
TO T775 CONNECTIONS 1 AND 2 (SENSOR A)
OR 7 AND 8 (SENSOR B).
M7431
Fig. 2. Parallel-series wiring of sensors.
Sensor Mounting
Mount the sensor on a wall or panel for sensing space
temperature (Fig. 3); strap it to a pipe, or insert it into a well
(Fig. 4) for hot/cold water sensing; or tape it to a standard
cap or bulb holder for duct air sensing. To prevent moisture or
condensation entering the sensor through the leadwire holes,
mount the sensor with leadwires exiting the bottom of the
sensor.
NOTE: Use heat conductive compound in immersion wells.
See Accessories.
3
63-2248—4
T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER
Mounting Sensor in T7047C1090 Case
쐃 Run wires from T775J through wall.
쐇 Mount case to wall with screws provided.
쐋 Connect wires from the T775J to two T terminals on the
T7047C Case.
Cut and strip 193987GA Sensor leads to 3 to 4 inch (76
to 102 mm) length and connect to T terminals in the
case.
Position sensor as shown in Fig. 3; assemble cover and
tighten cover screws.
CAUTION
1. Make sure that metal tube of sensor does not short
against T terminals in wall-mounted case.
2. Do not run sensor wiring (even if using shielded
cable) with building power wiring.
T7047C1090
WALLMOUNT SENSOR
CASE (OPTIONAL)
LEADWIRES
TO T775
SCREW
TERMINAL
SCREW
TERMINAL
193987GA
SENSOR
Wiring
CAUTION
Disconnect external power before wiring to prevent
electrical shock or equipment damage.
IMPORTANT
The T775J is not intended for safety limit
applications. It is an operating control, not a safety
control.
Disconnect external power before wiring to prevent electrical
shock or equipment damage. All wiring must comply with
applicable local codes and ordinances.
Refer to Fig. 4 for locating the appropriate power inputs,
remote sensor inputs, relay, modulating output terminals,
contact closure input, and sensor selection switch. Access the
terminals through standard conduit knockouts (A-C) located
around the enclosure perimeter.
NOTE: Hole A should only be used for remote sensor
wiring, low voltage wiring, and access to modulating
output.
When wiring the input power, only one source of power can
be applied to the T775J (e.g., 24 or 120 or 240 Vac).
Knockouts B and C can be used to gain access to 120 or 240
Vac input terminals and the load relay output terminals.
CAUTION: POSITION SENSOR AWAY
FROM SCREW TERMINALS.
Fig. 3. Sensor mounted on wall.
COVER SENSOR
LEADS WITH
HEAT CONDUCTIVE
COMPOUND
SENSOR PLACED
IN WELL
1/2 NPT
Fig. 4. Sensor inserted in immersion well.
M8109C
IMMERSION
WELL
M5249
The T775J can be used to provide reset control of damper
and valve actuators that accept 4 to 20 mA, 0 to 18 Vdc or
Electronic Series 90 modulating inputs, and to control one onoff load. Depending on the application and the motor or
actuator used, the T775J can control up to three Modutrol
motors by using resistor kits that are available as accessories
for existing motors. Use specified resistor kits to control an
Electronic Series 90 (Modutrol®) Motor with a 4 to 20 mA
controller. Obtain information on these kits from either the
TRADELINE® catalog, motor specification or your local
distributors. See Fig. 7 through 15 for typical T775J wiring and
applications.
63-2248—4
4
LCD
TEMPERATURE
DISPLAY
PROGRAMMING
KEYS
SENSOR INPUT,
TOD, AND
24V TERMINALS
KNOCKOUT "A"
MODULATING OUTPUT
ELECTRONIC
SERIES 90, 4-20 mA
OR 0-18 VDC
DEPENDING ON MODEL
T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER
C/F
O
C / OF SELECTION
RESET DIP
SWITCHES
MOUNTING
HOLE
LOCATION
LINE
VOLTAGE
INPUTS
SELECT
23
1
SA TOD 24V SB
1
2
3
SET
45678
ENTER
SA SB
COM
240V
120V
12
3
4
IMPORTANT
Erratic temperature readings from the 193987GA
Sensor can be caused by poor wiring practices that
must be avoided to assure proper operation:
a. Do not route temperature sensor wiring with
b. Do not locate temperature sensor wiring next to
c. Do not locate temperature sensor wiring near
d. Do not locate temperature sensor wiring near
e. Make sure good mechanical connections are
f. Do not mount sensor with leadwire end (wire end)
g. Use shielded wiring to connect the sensor to the
OUTPUT 1
KNOCKOUT "B"
RELAY OUTPUT
STAGES
NO COM NC
Fig. 5. Feature locations.
building power wiring.
control contactors.
electric motors.
welding equipment.
made to both the sensor and the controller.
pointing up in an area where condensation can
occur.
T775 when an electrically noisy environment
exists. See Fig. 6.
OUTPUT 2
NO COM NC
GROUND
SHIELD
TO T775
CASE OR TO
GROUNDING
SCREW
SHIELDED
CABLE
SELECT
23
1
SA TOD 24V SB
1
2
3
KNOCKOUT "C"
M8118
T775
SET
45678
ENTER
C/F
SA SB
COM
240V
120V
12
3
4
OUTPUT 1
SHIELDED
CABLE
NOTE: DO NOT GROUND
SHIELDED CABLE AT
SENSOR END.
NOTE: TO MINIMIZE NOISE PICKUP, MAKE CONNECTION
FROM SHIELDED CABLE AS CLOSE AS POSSIBLE
TO SENSOR BODY.
NO COM NC
Fig. 6. Using shielded cable for cable
runs longer than 25 feet.
5
OUTPUT 2
NO COM NC
GROUNDING SCREW
SENSOR
M4718
63-2248—4
T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER
C/F
1
2
3
SA SB
COM
240V
4
SENSOR A
SENSOR B
120V
M8111
SENSOR A
24 VAC
SENSOR B
LOAD 1 LOAD 2
SELECT
23
1
SA TOD 24V SB
1
2
3
OUTPUT 1
NO COM NC
SET
45678
ENTER
OUTPUT 2
NO COMNC
LOAD 1
SELECT
23
1
SA TOD 24V SB
1
2
3
OUTPUT 1
NO COM NC
SET
45678
LOAD 2
ENTER
OUTPUT 2
NO COMNC
C/F
SA SB
COM
240V
120V
1
2
3
4
BLK
240 VAC
RED
M8113
Fig. 7. Reset control with 24 Vac input,
24 Vac loads.
SET
ENTER
OUTPUT 2
NO COMNC
LOAD 2
SENSOR A
SENSOR B
LOAD 1
SELECT
23
1
SA TOD 24V SB
1
2
3
OUTPUT 1
NO COM NC
45678
C/F
SA SB
COM
240V
120V
1
2
3
4
BLK
120 VAC
WHT
M8112
Fig. 9. Reset control with 240 Vac input, 240 Vac loads.
C/F
12
3
SA SB
COM
240V
4
120V
BLK
120 VAC
WHT
24 VAC
M8114
SENSOR A
SENSOR B
SELECT
23
1
SA TOD 24V SB
1
2
3
OUTPUT 1
NO COM NC
LOAD 1
SET
45678
LOAD 2
ENTER
OUTPUT 2
NO COMNC
Fig 8. Reset control with 120 Vac input, 120 Vac loads.
63-2248—4
Fig. 10. Reset control with 120 Vac input, 24 Vac loads.
6
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