Honeywell T775abm Manual

INSTALLATION INSTRUCTIONS
62-0254-13
T775A/B/M Series 2000 
Electronic Stand-Alone 
Controllers
PRODUCT DESCRIPTION
The T775 electronic stand-alone controllers are the next 
generation of commercial and agricultural controls 
capable of remote sensing of temperature and providing 
switched and/or proportional outputs to various types of 
loads.
Five models have analog (modulating) outputs for 
actuator and motor control, and NEMA-4 weatherproof 
enclosures are available for wet environments.
IMPORTANT...

T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
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Temperature Sensorsa
The controller accepts 1,097 Ohms PTC at 77°F (25°C):
• 50021579-001 – Standard sensor (included with all 
models except NEMA 4X models)
• T775-SENS-STRAP– Strap on sensor with wiring box
• T775-SENS-WR – Water resistant with 5 foot leads 
(included with NEMA 4X models)
• T775-SENS-WT – Watertight with 6 foot lead
• T775-SENS-OAT – Outdoor air temperature sensor
• C7031B2005 – 6 inch duct mount with wiring box
•...

T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
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BEFORE INSTALLATION
Review the “SPECIFICATIONS” on page 35 before 
installing the controller.
When Installing This Product
1.Read these instructions carefully. Failure to follow 
them could damage the product or cause a 
hazardous condition.
2.Check ratings given in instructions and on the 
product to ensure the product is suitable for your 
application.
3.Installer must be a trained, experienced service 
technician.
4.After...

T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
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Wiring Connections Access
To access the wiring connections, remove the two screws 
on the left side of the enclosure and gently swing open the 
top. Be careful to not stress the ribbon cables that connect 
the keypad and LCD display to the controller circuit board.
Temperature Sensor Wiring
CAUTIONElectrical Shock Hazard.
Can short equipment circuitry.
Make sure that metal tube of sensor does not 
short against T terminals in...

T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
562-0254—13
Controller Wiring
WARNINGElectrical Shock Hazard.
Can cause severe injury, death or property 
damage.
Disconnect power supply before beginning wiring, 
or making wiring connections, to prevent electrical 
shock or equipment damage.
CAUTIONDo not use 24 Vac power to power any external 
loads if 120 Vac or 240 Vac is used to power 
the T775A/B/M controller.
CAUTIONA separate earth ground is required.
Equipment damage can result if the...

T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
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Controller Wiring Details
The wiring connection terminals are shown in Fig. 7 and 
are described in Table 2.
See Fig. 8 – 22 beginning on page 6 for typical T775A/B/
M wiring applications.
Fig. 7. T775A/B/M Terminal and Feature Locations.
NOTE: Refer to Table 1 on page 1 for the specific 
configuration of sensors and outputs 
supported by the model you are installing.
NOTE: For NEMA 4 enclosures, use waterproof fit-
tings for...

T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
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Fig. 9. Wiring for Four-Stage Control – 24 Vac Input
and 24 Vac Load.
Fig. 10. Wiring for Two-Stage Control with 120 Vac 
(120 Vac Input and 120 Vac Load Shown).Fig. 11. Wiring for Two-Stage Control with 240 Vac.
Fig. 12. Wiring for Four-Stage Control with 120 Vac 
(120 Vac Input and 120 Vac Load Shown).
L1
(HOT)
L224 VAC
M24476A
SENSOR A
C NONCC NONC C NC
NOC NCNO
T  
T 
COM LOAD
4
NO
LOAD
3 LOAD
2
LOAD
1
C+
COMNO
COM
NO
COM
NO
SENSOR...

T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
62-0254—138
Fig. 13. Wiring for Four-Stage Control with 240 Vac.
Fig. 14. Wiring for Floating Output (Relay 1 and Relay 
2 Pair Shown).
Fig. 15. Wiring for ML7984 Valve Actuator 
(Using 4 to 20 mA Signal)
.
Fig. 16. Wiring for Digital Input (Dry Contact).
Fig. 17. Wiring for Mod Motor or Direct Coupled 
Actuator with 4 to 20 mA Control Input
SENSOR A
C NONCC NONC
C NCNOC NCNO
T  
T 
COM 240V
M33849
LOAD 1
LOAD
3
LOAD
2 COM
NO
LOAD 4
C+
120
COM
240...

T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
962-0254—13
.
Fig. 18. Wiring for Mod Motor or Direct Coupled 
Actuator with 0 to 10 Vdc Control Input
Fig. 19. Wiring for Series 90 Modutrol Motor Control.
Fig. 20. Wiring for Changeover Relay and 
Minimum Position Potentiometer Used
with Series 90 Modutrol Motors.
T1 T2 C R
POWER
USE SEPARATE TRANSFORMER FOR T775R WHEN USING 24 VAC.1 HONEYWELL MODUTROL MOTOR WITH
VOLTAGE CONTROL INPUT
1
F
M24483A
MODULATING OUTPUT
TERMINAL (MOD 1)
B
R
W
+ –
B
R...

T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
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Fig. 21. Wiring for Three Series 90 Modutrol Motors
.
Fig. 22. Wiring for Unison Control of M9184 or M9185 Modutrol IV Motor Using One Minimum Position 
Potentiometer for All Motors.
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
USE A 1300 OHM RESISTOR FOR T WO MOTORS, 910 OHM RESISTOR FOR THREE MOTORS. 
THE 407EAU RESISTOR KIT, WHICH IS SHIPPED WITH THE M9184 AND M9185 MOTORS, 
INCLUDES BOTH RESISTORS....