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Honeywell T7351 Product Data Download Page 20

T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT

Automation and Control Solutions

Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN  55422

Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario  M1V 4Z9
customer.honeywell.com

® U.S. Registered Trademark
© 2010 Honeywell International Inc.
63-2666—02    M.S.  Rev. 09-10 
Printed in U.S.A.

Fig. 16. Typical hookup of T7351F2010 in two-stage heat and two-stage cool heat pump system with two transformers.

POWER SUPPLY.  PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER.

USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.

WHEN USING THE TR23-H FOR HUMIDITY SENSING, THERE IS NO NEED TO WIRE THE HC TERMINAL 

BECAUSE THE T3 TERMINAL IS INTERNALLY TIED TO HC, WHICH IS ALSO TIED TO TERMINAL 1 

COMMON AT THE SENSOR.  

1

M29323

2

2 

3

4

4

 

RC 

X 

SUBBASE 

O/B

G 

Y1 

 

W1

W2

Y2 

AUX 

RH 

T5 T6 T7 T4 T3 

DISCHARGE

AIR SENSOR

OUTDOOR 

AIR 

SENSOR 

OS 

OS AS 

AS 

1 

3

L1 

(HOT) 

L2 

1

L1

(HOT)

L2

COMPRESSOR

CONTACTOR 1

COMPRESSOR 

CONTACTOR 2 

HEATING 

TRANSFORMER

COOLING

TRANSFORMER

CHANGE-

OVER

FAN

RELAY

ECONOMIZER 

AUX HEAT 

STAGE 1

MOTION

SENSOR

HUMIDITY

SENSOR

M

M

HC

HP

HS

TR23-H REMOTE SENSOR

9

8

7

6

5

4

3

2

1

10 11 12

GND

SENSOR

SET

 PT

LED

BYP

ASS

Summary of Contents for T7351

Page 1: ...lled water systems 365 day programming Two Occupied and two Not Occupied periods per day Individual heat and cool setpoints available for Occupied and Not Occupied periods P I D control minimizes temperature fluctuations Recovery ramp control automatically optimizes equipment start times based on building load Convenient overrides allow temporary setpoint changes Keypad multi level lockout availab...

Page 2: ...ximum of two heat stages and two cool stages Mounting Means Mounts on subbase Subbase Mounts On Wall Using two 5 8 in long 6 32 screws included Outlet Box Using sheet metal screws Clock Accuracy at 77 F 25 C 1 min month 30 days Minimum Stage Operation Time fixed Minimum On Heat 1 minutes Cool 3 minutes Minimum Off Cool and Heat Pump 1 minute Electrical Ratings Power 24 Vac 50 60 Hz 20 to 30 Vac 50...

Page 3: ...y Disconnect power supply before installation IMPORTANT All wiring must agree with applicable codes ordinances and regulations MERCURY NOTICE If this control is replacing a control that contains mercury in a sealed tube do not place your old control in the trash Dispose of properly Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old ...

Page 4: ...s thermostat mounting orientation does not matter Wall mounting using standard drywall screws is standard Mounting to a 2 in 50 8 mm by 4 in 101 6 mm wiring box can be accomplished for a horizontal box no extra hardware is required for a vertical box part 209651A is required Mount to European standard wall box 2 4 in having 61 mm between mounting screws in a horizontal line with or without adaptiv...

Page 5: ...OLES MOUNTING SCREWS Table 3 T7351 Subbase for Three stage Heat Three stage Cool Systems Terminal Description Conventional Heat Pump RCa RCa 24 VAC Cooling transformer RHa RHa 24 VAC Heating transformer X X Common aux aux Auxiliary relay W1 O B Conventional Stage 1 heating relay Heat Pump Changeover relay for heating B or cooling O b W2 W1 Conventional Stage 2 heating relay Heat Pump 1st Stage aux...

Page 6: ...ature Refer to Table 2 for the default temperature setpoints See Programming section for complete instructions on changing the setpoints Setting System and Fan System default setting is Auto Fan default setting is On NOTE Use System and Fan keys to change settings System Settings Auto Thermostat automatically changes between heating and cooling based on indoor temperature Cool Thermostat controls ...

Page 7: ...T7351 firmware version number 3 To return to a Setup item cycle through the options 4 To change a setting use the up or down key 5 To exit the Installer Setup press Run Schedule 6 Display prompts SAV CFG save configuration Table 4 T7351 Intelligent Fan ON control logic Occupancy Call for Heat Cool Notes Scheduled Period Motion Sensor Signal Effective Occupancy Yes No Occupied No Sensor Wired Occup...

Page 8: ...Heat Pump Heating Energize O B on call for heat COOLSTG 1 0 4 Number of Cooling Stages 0 0 Stages of Cooling 1 1 Stages of Cooling 2 2 Stages of Cooling 3 3 Stages of Cooling Not available if Heat Pump is selected 4 4 Stages of Cooling W3 will be used as 4th stage relay Not available if Heat Pump is selected HEATSTG 1 0 3 Number of Conventional Heating Stages Not available if Heat Pump is selected...

Page 9: ... Deg F 1 1 Deg F 2 2 Deg F 3 3 Deg F 4 4 Deg F 5 5 Deg F TMP OCC 3 1 8 Temporary Occupied Duration 1 to 8 hours TMP CAL 0 4 3 Temporary Display Adjustment 0 3 0 to 3 DDF 4 7 4 to 1 DDF MINCOOL 45 F 7 C 45 99 F 7 37 C Min Cool Setpoint MAXHEAT 90 F 32 C 40 90 F 4 32 C Max Heat Setpoint HEATLCK NO YES or NO Heating Lockout Only displayed if Outdoor Air Sensor is selected NO None YES Enabled HTLCKSP ...

Page 10: ...t 5 Reheat w Min On DEH MIN 5 5 15 Dehumidify Minutes On DEH TMP 2 1 5 Dehumidify Temp Reset MINHTRT 5 0 20 DDF HR Minimum Heat Recovery Ramp Rate MAXHTRT 8 0 20 DDF HR Maximum Heat Recovery Ramp Rate Only Displayed if Outdoor Sensor is Selected MINHTOA 0 F 18 C 20 120 F 29 49 C Minimum Heat Outdoor Air Temperature Only Displayed if Outdoor Sensor is Selected MAXHTOA 40 F 4 C 20 120 F 29 49 C Maxi...

Page 11: ...es hold key down to continuously decrease value Also can make temporary change in temperature setpoint Information Obtains information where humidity high limit can be set cycles through setup options Up Arrow Raises setpoint day or time When setting times or temperatures hold key down to continuously increase value Also can make temporary change in temperature setpoint Temperature Occupied Heat S...

Page 12: ... if the compressor is cycled too quickly Use the Test Mode to check the thermostat configurations and operation To start the system test 1 Press Schedule Day Occupied and Not Occupied simultaneously 2 The display gives the option to TEST a To enter test mode press up or down until the display indicates IN TEST b To cancel this option ensure display indicates NO TEST 3 Press Run Schedule NOTES To v...

Page 13: ...ature and excessive overdriving of modulating outputs All adjustments to Loop Tuning parameters should be gradual After each change allow the system to stabilize to accurately observe the effects of the change Then as needed make further refinements until the system operates as desired If adjustment of PID parameters is required use the following NOTE In the items that follow the term error refers...

Page 14: ...he heat mode in Fig 10 except the slope of the line reverses for cooling Fig 12 Setpoint Ramping Parameters with Ramp Rate Calculation Advantages Comfort setting is achieved at the programmed time and maintained regardless of weather conditions occupants are comfortable Drafts from low temperature discharge air are minimized during Occupied periods Use of the more economical first stage of heat is...

Page 15: ...he auxiliary relay are hot water heaters lighting or baseboard heat The additional loads are connected to the auxiliary relay contacts on the subbase The contacts are rated for 1 5A at 30 Vac but can be adapted to higher current applications using an external relay See Fig 13 Fig 13 Using T7351 Models with an External Relay with loads greater than 1 5A Default Auxiliary Relay Operations Unless con...

Page 16: ...is normal NOTES The heat stage never energizes during Reheat if more than one cool stage is on Reheat mode cannot occur during heating RESET TEMP SETPT The room temperature set point resets to a specified number of degrees below the actual set point when room relative humidity RH rises above humidity high limit The default value is 2 degrees Though this may not technically reduce RH it reduces the...

Page 17: ... blown if so replace fuse Check if the HVAC equipment power switch is in the Off position if so set to the On position Check wiring between thermostat and HVAC equipment Replace broken wires and tighten loose connections If 24 Vac is present proceed with troubleshooting Temperature display is incorrect Thermostat is configured for F or C display Press both Run Schedule and Copy then reconfigure th...

Page 18: ...ipped if so reset circuit breaker Check if system fuse is blown if so replace fuse Check if the HVAC equipment power switch is in the Off position if so set to the On position Check wiring between thermostat and HVAC equipment Replace broken wires and tighten loose connections If 24 Vac is present proceed with troubleshooting Thermostat minimum off time is activated Wait up to five minutes for the...

Page 19: ...S OS AS AS M HC HP HS 1 L1 HOT L2 COMPRESSOR CONTACTOR 1 COMPRESSOR CONTACTOR 2 HEAT RELAY 1 FAN RELAY HEAT RELAY 2 COMPRESSOR CONTACTOR 3 HEAT RELAY 3 TR23 H REMOTE SENSOR 9 8 7 6 5 4 3 2 1 10 11 12 GND SENSOR SET PT LED BYPASS 5 5 4 ECONOMIZER POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD HEAT COOL SYSTEMS WITH ONE TRANSF...

Page 20: ...D WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS REMOVE THE FACTORY INSTALLED JUMPER USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS WHEN USING THE TR23 H FOR HUMIDITY SENSING THERE IS NO NEED TO WIRE THE HC TERMINAL BECAUSE THE T3 TERMINAL IS INTERNALLY TIED TO HC WHICH IS ALSO TIED TO TERMINAL 1 COMMON AT THE SENSOR 1 M29323 2 2 3 4 4 RC X SUBBASE O B G Y1 W1 W2 Y2 AUX RH T5 T6 T7 T4 T...

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