Honeywell T7351 Thermostat User Manual

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T7351 Commercial Programmable  
Thermostat  
FOR SINGLE- OR MULTI-STAGE CONVENTIONAL/HEAT PUMP  
SYSTEMS  
INSTALLATION INSTRUCTIONS  
APPLICATION  
Location  
Do not install the thermostat where it can be affected by:  
— drafts, or dead spots behind doors and in corners.  
— hot or cold air from ducts.  
— radiant heat from sun or appliances.  
— concealed pipes and chimneys.  
— unheated (uncooled) areas such as an outside wall  
behind the thermostat.  
The T7351 Commercial Programmable Thermostat  
controls 24 Vac commercial single zone heating,  
ventilating and air conditioning (HVAC) equipment. The  
T7351 consists of a thermostat and subbase. The  
thermostat includes the display and keypad for 7-day  
programming. The subbase includes equipment control  
connections. The subbase mounts on the wall and the  
thermostat mounts to the subbase.  
IMPORTANT  
To avoid electrical interference, which can  
cause erratic performances, keep wiring runs as  
short as possible and do not run thermostat  
wires adjacent to the line voltage electrical dis-  
tribution systems. Use shielded cable. The  
cable shield must be grounded only at the con-  
trolled equipment case.  
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 control. If you have  
questions, call Honeywell Customer Care Center  
at 1-800-468-1502.  
Subbase  
WHEN USED TO SENSE ROOM TEMPERATURE  
Install the thermostat about 5 ft. (1.5m) above the floor in  
an area with good air circulation at average temperature.  
(See Fig. 1.)  
INSTALLATION  
WHEN NOT USED TO SENSE ROOM TEMPERATURE  
When using the remote-mounted temperature (and  
humidity) sensor(s) to sense ambient conditions, install  
the thermostat in an area that is accessible for setting  
and adjusting the temperature and settings.  
When Installing this Product...  
1
.
.
Read these instructions carefully. Failure to follow  
them could damage the product or cause a hazard-  
ous condition.  
Check ratings given in instructions and on the  
product to ensure the product is suitable for your  
application.  
Install the remote-mounted sensor(s) about 5 ft. (1.5m)  
above the floor in an area with good air circulation at  
average temperature (See Fig. 1).  
2
3
.
.
Installer must be a trained, experienced service  
technician.  
After installation is complete, check out product  
operation as provided in these instructions.  
If multiple remote sensors are required, they must be  
arranged in a temperature averaging network consisting  
of four sensors (See Fig. 2).  
4
NOTE: Only T7770 models with no setpoint adjustment  
can be used for temperature averaging.  
CAUTION  
Electrical Shock or Equipment Damage  
Hazard. Can shock individuals or short  
equipment circuitry.  
Disconnect power supply before installation.  
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT  
SUBBASE  
T3  
T4  
YES  
NO  
T7770A  
T
T7770A  
T
T
T
NO  
NO  
5 FEET  
1.5 METERS)  
(
T7770A  
T
T7770A  
T
T
T
M4823A  
Fig. 1. Typical location of thermostat or  
remote-mounted sensor.  
M19606A  
Mounting Subbase  
Fig. 2. Four T7770A Sensors providing temperature  
averaging network for T7351 Thermostat.  
The subbase mounts horizontally.  
IMPORTANT  
When using the internal temperature or humidity  
sensor, the device must be mounted horizontally  
(
with the LCD facing upwards). Precise leveling  
is not needed.  
WIRES THROUGH WALL  
When using remote room temperature and  
humidity sensors, thermostat mounting  
orientation does not matter.  
MOUNTING  
HOLES  
Wall mounting (using standard drywall screws) is  
standard. Mounting to a 2 in. by 4 in. (50.8 mm by 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 (having 2.4 in.  
WALL  
ANCHORS  
(
2)  
(60.3 mm) between mounting screws in a horizontal  
line) with or without adaptive hardware.  
1.  
Position and level the subbase.  
MOUNTING  
SCREWS  
NOTE: A level wallplate is only for appearance.  
The thermostat functions properly when  
not level.  
M19608  
Fig. 3. Mounting the subbase.  
2
.
.
Use a pencil to mark the mounting holes. (See  
Fig. 3).  
Remove the subbase from the wall and drill two 3/  
3
Mounting Thermostat on Subbase (Fig. 4)  
1
6 in. (4.8 mm) holes in the wall (if drywall) as  
With the subbase installed, mount the thermostat:  
marked. For firmer material such as plaster or  
wood, drill two 7/32 in. (5.6 mm) holes.  
Gently tap anchors (provided) into the drilled holes  
until flush with the wall.  
1
2
3
.
.
.
Engage top subbase tabs into the thermostat top.  
Swing the thermostat down.  
Press the lower edge of the case to latch.  
4
.
.
5
Position the subbase over the holes, pulling wires  
through the wiring opening.  
Loosely insert the mounting screws into the holes.  
Tighten mounting screws.  
NOTE: To remove the thermostat from the wall, first pull  
out at the bottom of the thermostat; then remove  
the top.  
6
7
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SETTINGS  
A. ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE.  
Using Thermostat Keys  
The thermostat keys are used to:  
set current time and day,  
program times and setpoints for heating and cooling,  
override the program temperatures,  
display present setting,  
set system and fan operation.  
NOTE: See Fig. 5 for keypad information.  
Setting Temperature  
Refer to Table 2 for the default temperature setpoints. To  
set the Occupied and Not Occupied Heat and Cool  
setpoints, simply press the Heat and Cool button under  
the Occupied or Not Occupied area of the keypad. To set  
the Standby Heat setpoint, press both the Occupied and  
Not Occupied Heat buttons simultaneous. To set the  
Standby Cool setpoint, press the Occupied Cool and Not  
Occupied Heat buttons simultaneously.  
B. PRESS LOWER EDGE OF CASE TO LATCH.  
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  
M19609  
Auto: Thermostat automatically changes between  
heating and cooling based on indoor temperature.  
Cool: Thermostat controls cooling.  
Fig. 4. Mounting thermostat on subbase.  
Off: Heating, cooling, and fan are all off.  
Heat: Thermostat controls heating.  
Em Heat: Auxiliary heat serves as first stage.  
Compressor stages are locked off.  
Wiring  
Follow equipment manufacturer wiring instructions when  
available. Refer to the Wiring Diagram section for typical  
hookups. A letter code is located near each terminal for  
identification.  
Fan Settings  
On: See Table 1.  
IMPORTANT  
— Auto: Fan always cycles with call for heat or cool.  
All wiring must comply with local electrical codes  
and ordinances.  
Conventional: The equipment (i.e. plenum switch)  
controls fan operation in heat mode. Thermostat  
controls fan operation in cool mode.  
Electric Heat: Thermostat controls fan operation in  
both heat and cool modes.  
NOTE: Maximum (and recommended) wire size is 18-  
gauge. Do not use wire smaller than 22-gauge.  
1.  
Loosen subbase terminal screws and connect sys-  
tem wires.  
NOTES: Fan operation can extend (delay Off) after the  
heating/cooling turns off:  
2.  
3.  
4.  
Securely tighten each terminal screw.  
Push excess wire back into the hole in the wall.  
Plug the hole with nonflammable insulation to pre-  
vent drafts from affecting the thermostat.  
Heating choices are 0 or 90 seconds.  
Cooling choices are 0 or 40 seconds.  
Table 1. Fan On Control Logic.  
Occupancy  
Call for Heat/Cool  
Yes No  
Scheduled  
Occupied  
Sensor Signal  
Occupied  
On  
On  
On  
Occupied  
Standby  
Off a  
Standby  
On  
On  
On  
Not Occupied  
Off a  
a
In heat mode, when set for conventional heat, the equip-  
ment (i.e. plenum switch) could power the fan despite  
the T7351.  
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Temperature  
Set Day/Time  
Override  
Temporary Temporary  
Occupied Not Occupied  
Occupied  
HEAT  
Not Occupied  
HEAT  
Day  
Time  
COOL  
COOL  
Schedule  
System  
Fan  
Run  
Clear  
Day  
Occupied Not Occupied Start Time  
Copy  
HEAT COOL  
ON AUTO  
Schedule  
M19610  
Fig. 5. Thermostat key locations.  
INSTALLER SETUP  
Setup Using Keypad  
The installer uses the Installer Setup to customize the  
thermostat to specific systems  
For most applications, the thermostat factory settings do  
not need to be changed. Review the factory settings in  
Table 2.  
A combination of key presses are required to use the  
Installer Setup feature:  
NOTE: When power is first applied to the thermostat, the  
display will show all segments (see Fig. 6).  
1. To enter the Installer Setup, press and hold both the  
Run Schedule and the Copy keys until DEGREES  
0
0 (or DEGREES 01) displays.  
Table 2. Default Setpoints.  
NOTE: Installer Setup will display WAIT and is  
unavailable for 30 seconds after power up.  
Control  
Occupied  
Not Occupied  
Standby  
Heating 70° F (21° C) 55° F (13° C)  
Cooling 75° F (24° C) 85° F (29° C)  
67° F (19° C)  
78° F (26° C)  
2
.
To advance to the next Installer Setup number,  
press  
.
NOTE: Pressing Run/Copy again while in this  
mode displays the T7351 firmware version  
number.  
TemporaryStandby Set Set Schedule Room  
Not Occupied12 StartTime  
AM  
PM  
%
MonTueWedThuFriSatSunHol MinsDays  
Fan  
OnAuto  
3
4
5
6
.
.
.
.
To return to a Setup item, cycle through the options.  
To change a setting, use the up ! or down " key.  
To exit the Installer Setup, press Run Schedule.  
Display prompts SAV CFG (save configuration).  
a. If you want to save the new configuration, use  
the up ! or down " key to change NO to YES  
before pressing Run Schedule.  
System  
EmHeat  
OffCoolAuto Dehumid  
M19611  
Fig. 6. LCD display of all segments.  
b. If you want the configuration to remain as it was  
before starting this change, ensure the  
CAUTION  
Possible Equipment Damage.  
Fan must be running when system is  
operating.  
display indicates SAV CFG NO and press Run  
Schedule.  
Heat pump and electric heat systems must be  
configured correctly to prevent equipment damage  
caused by the system running without the fan.  
NOTE: Installer Setup is automatically exited after five  
minutes with no key pressed. Upon this auto-  
matic exit, all changes are lost.  
Configuration  
Configuration can be done with the keypad using the  
Installer Setup (ISU).  
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Table 3. Installer Setup.  
Text  
Default  
Choices  
0 -1  
Notes  
DEGREES  
0
Degree Temperature Format  
0
1
: Degrees F  
: Degrees C  
CLOCK  
0
0
0 - 1  
0 - 3  
Clock Display Format  
0
1
: 12 hour  
: 24 hour  
KEYLOCK  
Keypad Lockout Level  
0
1
: None  
: Lockout all keys except Set Day, Set Time, Set Date, Set Holidays,  
Temporary Occupied, Temporary Not Occupied, System, Fan, Up, Down and  
Information  
2
: Lockout all keys except Set Day, Set Time. Set Date, Set Holidays,  
Temporary Occupied, Temporary Not Occupied, Up, Down and Information  
: Lockout all keys except Information  
3
HEATPMP  
COOLSTG  
0
1
0 - 2  
0 - 4  
Application Type Selection  
0
1
2
: Conventional  
: Heat Pump - Cooling (Energize O/B on call for cool)  
: Heat Pump - Heating (Energize O/B on call for heat)  
Number of Cooling Stages  
0
1
2
3
4
: 0 Stages of Cooling  
: 1 Stages of Cooling  
: 2 Stages of Cooling  
: 3 Stages of Cooling  
: 4 Stages of Cooling (W3 will be used as 4th stage relay)  
HEATSTG  
1
0 - 3  
Number of Heating Stages  
0
1
2
3
: 0 Stages of Heating  
: 1 Stages of Heating  
: 2 Stages of Heating (This is the max if 4 cooling stages is selected)  
: 3 Stages of Heating  
AUX STG  
AUX CON  
0
0
0 - 2  
0 - 3  
Only shown when Heat Pump is selected  
0
1
2
: 0 Aux Stages  
: 1 Aux Stages  
: 2 Aux Stages  
Aux Contact Functionality  
0
1
2
3
: Time of Day  
: Economizer  
: Dehumid - Hot Gas Bypass  
: Simple Dehumid  
WALLMOD 0  
0 - 3  
Remote Room Sensor Selection  
0
1
2
3
: Local sensor only  
: T7770A/D (Remote Sensor, No Remote Setpoint, Bypass 0)  
: T7770B/C (Remote Sensor, Remote Setpoint, Bypass 0)  
: T7771 (Remote sensor, Remote Setpoint, Bypass 1)  
(
(
Display only if sub-base 2, 3, 4+)  
This item is not displayed when  
OATSENS  
DATSENS  
0
0
0 - 1  
0 - 1  
0 - 2  
Outdoor Air Sensor Selection  
0
1
: None  
: Remote Outdoor Air Sensor  
Discharge Air Sensor Selection  
0
1
: None  
: Remote Discharge Air Sensor  
HUMSENS 0  
Room Humidity Sensor selection  
0
1
2
: None  
: On Board Sensor  
: Remote Sensor  
OCCSENS  
FAN HT  
0
0
0 - 1  
0 - 1  
Occupancy Sensor Selection  
0
1
: None  
: Remote Occ Sensor  
Fan Operation on Heat  
0
1
: Conventional (Equipment controls Fan)  
: Electric (Thermostat turns on Fan with call for Heat)  
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Table 3. Installer Setup. (Continued)  
Notes  
Text  
Default  
Choices  
XFAN HT YES  
YES or NO  
Extended Fan on Heat  
NO: None  
YES: 90 seconds  
XFAN CL NO  
YES or NO  
Extended Fan on Cool  
NO: None  
YES: 40 seconds  
STRTDEL  
0
0 - 15  
Sequential Start Delay  
0
to 150 seconds in 10 second increments  
ADVANCE NO  
YES or NO  
Advanced Settings  
NO: Hide  
YES: Show  
TMP LIM  
3
0 - 5  
Temporary Setpoint Adjustment  
0
1
2
3
4
5
: 0 Deg. F  
: 1 Deg. F  
: 2 Deg. F  
: 3 Deg. F  
: 4 Deg. F  
: 5 Deg. F  
TMP OCC  
TMP CAL  
3
0
1 - 8  
Temporary Occupied Duration  
to 8 hours  
1
-4 - 3  
Temporary Display Adjustment  
0
4
- 3 = 0 to 3 DDF  
- 7 = -4 to -1 DDF  
MINCOOL 45° F  
7° C)  
45° - 99° F  
(7° - 37° C)  
Min Cool Setpoint  
(
MAXHEAT 90° F  
40° - 90° F  
32° C) (4° - 32°)  
YES or NO  
Max Heat Setpoint  
(
HEATLCK NO  
Heating Lockout (Only displayed if Outdoor Air Sensor is selected)  
NO: None  
YES: Enabled  
HTLCKSP 70° F  
-40° - 120 ° F  
Heating Lockout Temperature  
(Display only if Remote Outdoor Air Sensor is configured)  
(
21° C) (-40° - 49° F)  
COOLLCK NO  
YES or NO  
Cooling Lockout (Only displayed if Outdoor Air Sensor is Selected)  
NO: None  
YES: Enabled  
CLLCKSP 35° F  
-40° - 120° F  
(-40° - 49° C)  
Cooling Lockout Temperature  
(Display only if Remote Outdoor Air Sensor is configured)  
(
2° C)  
DAT LL  
NO  
YES or NO  
Discharge Low Limit (Only displayed if Discharge Air Sensor is Selected)  
NO: None  
YES: Enabled  
DATLLSP 45° F  
7° C)  
35° - 60° F  
(2° - 16° C)  
Discharge Low Temp Limit  
(Display only if Discharge Sensor is configured)  
(
DAT HL  
NO  
YES or NO  
Discharge High Limit (Only displayed if Discharge Air Sensor is Selected)  
NO: None  
YES: Enabled  
DATHLSP 110° F 65° - 140° F  
43° C) (18° - 60° C)  
Discharge High Temperature Limit  
(Display only if Discharge Sensor is configured)  
(
DEHUMID  
0
0 - 5  
Dehumidification  
0
1
2
3
4
5
: None  
: MinOn Time  
: Reset Temp Setpoint  
: Reset w/ MinOn  
: Reheat  
: Reheat w/ Min On  
DEH MIN  
DEH TMP  
MINHTRT  
MAXHTRT  
5
2
5
8
5 - 15  
1 - 5  
Dehumidify Minutes On  
Dehumidify Temp Reset  
0 - 20 DDF/HR Minimum Heat Recovery Ramp Rate  
0 - 20 DDF/HR Maximum Heat Recovery Ramp Rate (Only Displayed if Outdoor Sensor is  
Selected)  
MINHTOA 0° F  
-20° - 120° F  
Minimum Heat Outdoor Air Temperature (Only Displayed if Outdoor Sensor is  
Selected)  
(
-18° C) (-29° - 49° C)  
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Table 3. Installer Setup. (Continued)  
Text  
MAXHTOA 40° F  
4° C)  
Default  
Choices  
Notes  
-20° - 120° F  
(-29° - 49° C)  
Maximum Heat Outdoor Air Temperature (Only Displayed if Outdoor Sensor is  
Selected)  
(
MINCLRT  
MAXCLRT  
3
6
0 - 20 DDF/HR Minimum Cool Recovery Ramp Rate  
0 - 20 DDF/HR Maximum Cool Recovery Ramp Rate (Only Displayed if Outdoor Sensor is  
Selected)  
MINCLOA 90° F  
-20° - 120° F  
Minimum Cool Outdoor Air Temperature (Only Displayed if Outdoor Sensor is  
Selected)  
(
32° C) (-29° - 49° C)  
MAXCLOA 70° F -20° - 120° F  
21° C) (-29° - 49° C)  
Maximum Cool Outdoor Air Temperature (Only Displayed if Outdoor Sensor is  
Selected)  
(
(
DayLight Savings options only display when Date is valid)  
0 - 12 DLS Spring Month  
0 - 31, 32 - 74 DLS Spring Day  
DSTMON1  
3
DSTDAY1 40  
0
3
3
- 31 = Day of Month  
2 = Last Day of Month  
3 = First Sunday  
etc…  
DSTMON2 11  
DSTDAY2 33  
0 - 12  
DLS Fall Month  
0 - 31, 32 - 74 DLS Fall Day  
0
3
3
- 31 = Day of Month  
2 = Last Day of Month  
3 = First Sunday  
etc…  
HT RESP  
CL RESP  
1
0
0 - 3  
0 - 1  
0: Standard - 3 cph  
1
2
3
: Medium - 6 cph  
: Fast - 9 cph  
: Super Fast - 20 cph  
0: Standard - 3 cph  
: Fast - 4 cph  
1
Holidays and 365 - Day Clock  
The T7351can be configured to schedule up to 10  
separate holidays, each with a duration of up to 99 days.  
To enable this function, the user must set the date:  
Holidays can be set in the following manner:  
1. Press the “Temporary Occupied” and Temporary  
Not Occupied” keys simultaneously.  
2
.
The month (MON) of the first holiday is then dis-  
played (00 means the holiday is ignored).  
1
2
.
.
Press Set Day and Set Time keys simultaneously.  
Use the Up/Down keys to set the date to YES, then  
3. Use the Up/Down keys to set the month, then press  
the key.  
4. Use the Up/Down keys to set the day, then press  
the key (see Table 4 for valid day choices).  
5. Use the Up/Down keys to set the duration.  
The first holiday is now set and pressing the  
press the  
Use the Up/Down keys to set the month, then press  
the key.  
Use the Up/Down keys to set the day, then press  
the key (See Table 4 for valid day choices).  
Use the Up/Down keys to set the year, then press  
key.  
3.  
4.  
5.  
key will  
take you to programming the second holiday (denoted by  
the number 2 on the screen).  
the  
key.  
Table 4. Valid Day Values.  
Value  
Description  
Value  
Description  
Value  
Description  
Third Saturday  
Fourth Sunday  
Fourth Monday  
Fourth Tuesday  
Value  
64  
Description  
Fifth Wednesday  
Fifth Thursday  
Fifth Friday  
1
3
3
3
3
3
3
3
3
4
4
to 31 Day of month  
42  
Second Tuesday  
53  
2
Last Day of Month 43  
Second Wednesday 54  
65  
3
4
5
6
7
8
9
0
1
First Sunday  
44  
45  
46  
47  
48  
49  
50  
51  
52  
Second Thursday  
Second Friday  
Second Saturday  
Third Sunday  
55  
56  
57  
58  
59  
60  
61  
62  
63  
66  
First Monday  
First Tuesday  
First Wednesday  
First Thursday  
First Friday  
67  
Fifth Saturday  
Last Sunday  
Fourth Wednesday 68  
Fourth Thursday  
Fourth Friday  
Fourth Saturday  
Fifth Sunday  
69  
70  
71  
72  
73  
74  
Last Monday  
Last Tuesday  
Last Wednesday  
Last Thursday  
Last Friday  
Third Monday  
Third Tuesday  
Third Wednesday  
Third Thursday  
Third Friday  
First Saturday  
Second Sunday  
Second Monday  
Fifth Monday  
Fifth Tuesday  
Last Saturday  
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Table 5. T7351 Key Function Summary.  
Definition  
Grouping  
Button  
Down Arrow  
Information  
Lowers setpoint, day, or time. When setting times or temperatures, hold key  
down to continuously decrease value. Also can make temporary change in  
temperature setpoint.  
"
Information  
Up Arrow  
Obtains information (where humidity “high-limit” can be set), cycles through  
setup options.  
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  
Sets Occupied Heat setpoint.  
Sets Occupied Cool setpoint.  
Sets Not Occupied Heat setpoint.  
Occupied  
Cool  
Not  
Occupied  
Heat  
Not  
Sets Not Occupied Cool setpoint.  
Occupied  
Cool  
Set  
Day  
Sets day of week. Tapping key with 'Set Value' segment on increases current  
day (same effect as Up Arrow key).  
Time  
Sets time. Tapping key with “Set Value” segment on increases time in one  
hour increments.  
Override  
Schedule  
Temporary  
Occupied  
Temporary occupied setting for length of time defined by installer. User can  
modify setpoints.  
Temporary Not  
Occupied  
Sets holiday length. User selects number of days (“0”-”99”), or “---” for  
continuous override.  
Day  
Selects day schedule to modify. (Used also with copy key.)  
Occupied  
Selects occupied event start times for specified day. Repeatedly press this  
key to toggle between two occupied events.  
Not Occupied  
Clear Start Time  
Copy  
Selects not occupied event start times for specified day. Repeatedly press  
this key to toggle between two not occupied events.  
Clears start time for specified period and day.  
Copies schedule from one day to another.  
System  
Fan  
Selects System Mode. Toggles through Em Heat, Heat, Off, Cool, and Auto.  
Selects fan operation mode. Toggles between On and Auto.a  
Run Schedule  
Resumes running schedule (cancels Temporary Occupied action, Holiday,  
and/or Temporary setpoint changes.)  
a
On: Continuous fan operation (occupied and standby). During not occupied periods, fan cycles with call for heat or cool.  
Auto: Fan cycles with call for heat or cool during all periods. (See Product Data Sheet, form 63-2605, for more details).  
NOTES: The display returns to default screen after pressing Run Schedule (or after a period of time without keypress):  
ten seconds: when returning from temporary setpoint changes, info screen, temp occ, and temp not occ.  
one minute: when returning from setting clock/day.  
ten minutes: when returning from System Checkout.  
five minutes: when returning from all other modes.  
Special Functions  
Restore Factory Configuration (Run/Clear)  
1. Press both Run Schedule and Clear Start Time.  
2
.
The display gives the option to revert to FAC CFG.  
a. To restore the factory defaults, press up ! or  
down " until the display indicates YES.  
b. To cancel this option, ensure the display  
indicates NO.  
IMPORTANT  
This operation erases current configuration and  
restores factory defaults for all configuration,  
parameters, setpoints and schedules. To regain  
the old requires device reconfiguration.  
3
.
Press Run Schedule.  
62-0258  
8
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT  
Get Factory Schedule (Info/Clear)  
DEHUMIDIFICATION  
Performing this operation reverts the schedules to the  
factory defaults:  
There are five methods through which the T7351 can  
control for dehumidification. Three of them modify the  
control algorithm, thus providing limited dehumidification  
through cooling. The other two use the auxiliary output to  
control another device.  
1
2
.
.
Press both Info and Clear Start Time.  
The display gives the option to revert to FAC SCH.  
a. To restore the factory schedule, press up ! or  
down " until the display indicates YES.  
b. To cancel this option, ensure display indicates  
NO.  
NOTE: The dehumidification high limit can be set within  
the range of 10 to 90 percent relative humidity.  
3.  
Press Run Schedule.  
Test Mode (Occupied/Not Occupied/Schedule  
Day)  
Control Through Cooling  
Configure using some combination of the following:  
Minimum On.  
Reheat.  
Reset.  
CAUTION  
Possible Equipment Damage.  
Equipment damage can result if compressor is  
cycled too quickly.  
The minimum off time for compressors is  
bypassed during Test Mode. Equipment damage  
can occur if the compressor is cycled too quickly.  
NOTES:  
These methods operate only during cooling.  
Selecting both Reheat and Reset options can  
cause frequent setpoint adjustments. This  
selection is not recommended.  
Use the Test Mode to check the thermostat configurations  
and operation. To start the system test:  
Min. ON Time  
1.  
Press Schedule Day, Occupied and Not Occupied  
simultaneously.  
Dehumidifies by increasing the compressor minimum on  
time (normally 3 minutes) by a programmable amount.  
This is useful with oversized systems in that it forces the  
coils to cool to a point where dehumidification can occur.  
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.  
Press Run Schedule.  
NOTES:  
Can force wider temperature swings by cool-  
ing when setpoint control does not require it.  
The minimum on time can be set within the  
range of 5 to 15 minutes.  
Hysteresis and a minimum timer are used to  
ensure this behavior does not change with  
every equipment cycle.  
3.  
NOTES:  
To verify whether or not the system test is still  
active, repeat the above process.  
The system test times out after ten minutes  
with no key pressed.  
Reheat  
Save User Schedule (Info/Copy)  
Performing this operation saves the current schedule  
Dehumidifies by operating cooling during typical off time.  
The T7351 maintains the proper setpoint by running the  
heat at the same time.  
(including holidays) to memory, overwriting the old saved  
IMPORTANT  
At times during Reheat dehumidification, the  
T7351 operates heating and the cooling simulta-  
neously. This is normal.  
NOTES:  
The heat stage never energizes during  
Reheat if more than one cool stage is on.  
Reheat mode cannot occur during heating.  
Getting the user schedule restores the schedule  
Reset Temp SetPt  
(including holidays) from saved memory, overwriting the  
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 set  
point.  
Though this may not technically reduce relative humidity  
in the room, it reduces the dew point to provide the  
customer with a sense of comfort due to a lower  
temperature setting in the room.  
As long as RH stays above humidity high limit set point,  
this set point is maintained.  
NOTE: Hysteresis and a minimum timer prevent the set  
point from short interval alternation (between  
standard and reset set points).  
9
62-0258  
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT  
Options Utilizing Auxiliary Output  
Dehumid Hot Gas BP  
There are two dehumidification options that utilize the  
auxiliary output. They are:  
The auxiliary output operates as shown in Table 6.  
Simple Dehumidification.  
Hot Gas Bypass Dehumidification.  
Table 6. Hot Gas Bypass Dehumidification Logic.  
Humidity Cooling Stages Active Auxiliary Output  
Simple Dehumid(ification)  
High  
High  
Low  
Low  
more than one  
one or less  
De-energized  
Energized  
The auxiliary output:  
Energizes when RH rises above humidity high limit.  
De-energizes when RH drops below humidity high  
limit.  
more than one  
one or less  
De-energized  
De-energized  
Auxiliary output during call for multiple cooling stages for  
two reasons:  
NOTES:  
Hysteresis and a minimum timer prevent  
short cycling of this output.  
Unlike Dehumid Hot Gas BP the relay  
remains energized during calls for multiple  
cooling stages.  
1
2
3
.
.
.
This method assumes that the cooling provides  
dehumidification.  
Multiple cooling stages probably provide necessary  
dehumidification.  
Hysteresis and a minimum timer prevent short  
cycling of this output.  
WIRING DIAGRAMS  
OUTDOOR  
AIR  
SENSOR  
T7770 REMOTE SENSOR  
COMPRESSOR  
CONTACTOR 2  
DISCHARGE  
9
8
7
6
5
4
3
2
1
AIR  
HEAT  
RELAY 2  
SENSOR  
SUBBASE  
T5  
T6  
T7  
T4  
T3  
OS  
M
OS  
M
AS  
X
AS  
W2  
Y1  
Y2  
G
HS  
HC  
HP  
RH RC AUX W1  
2
HUMIDITY  
SENSOR  
MOTION  
SENSOR  
HEAT  
RELAY 1  
FAN  
RELAY  
COMPRESSOR  
CONTACTOR 1  
3
ECONOMIZER  
L2  
L2  
L1  
1
1
L1  
HOT)  
(
(HOT)  
HEATING  
TRANSFORMER  
COOLING  
TRANSFORMER  
1
2
3
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.  
M25324  
Fig. 7. Typical hookup of T7351F2010 in two-stage heat and two-stage cool heat pump system with two  
transformers.  
OUTDOOR  
AIR  
SENSOR  
HEAT  
RELAY 2  
T7770 REMOTE SENSOR  
DISCHARGE  
AIR  
SENSOR  
9
8
7
6
5
4
3
2
1
COMPRESSOR  
CONTACTOR 4  
COMPRESSOR  
CONTACTOR 2  
SUBBASE  
T5  
T6  
T7  
T4  
T3  
OS  
M
OS  
M
AS  
X
AS  
W3/Y4 Y3  
W2  
Y1  
Y2  
G
HS  
HC  
HP  
RH RC AUX W1  
COMPRESSOR  
CONTACTOR 3  
FAN  
RELAY  
HUMIDITY  
SENSOR  
MOTION  
SENSOR  
3
HEAT  
RELAY 1  
COMPRESSOR  
CONTACTOR 1  
4
L2  
L1  
1
2
ECONOMIZER  
(
HOT)  
1
2
3
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD.  
HEAT/COOL SYSTEMS WITH ONE TRANSFORMER REQUIRE THE FACTORY-INSTALLED JUMPER.  
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.  
M19768A  
Fig. 8. Typical hookup of T7351F201U in two-stage heat and four-stage cool conventional system.  
2-0258 10  
6
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT  
OUTDOOR  
AIR  
SENSOR  
4
COMPRESSOR  
T7770 REMOTE SENSOR  
ECONOMIZER  
CONTACTOR 2  
DISCHARGE  
AIR  
SENSOR  
9
8
7
6
5
4
3
2
1
HEAT  
RELAY 3  
HEAT  
RELAY 2  
SUBBASE  
T5  
T6  
T7  
T4  
T3  
OS  
M
OS  
M
AS  
X
AS AUX W3/Y4 Y3  
RH RC AUX W1  
W2  
Y1  
Y2  
G
HS  
HC  
HP  
COMPRESSOR  
CONTACTOR 3  
HUMIDITY  
SENSOR  
MOTION  
SENSOR  
3
HEAT  
RELAY 1  
FAN  
RELAY  
COMPRESSOR  
CONTACTOR 1  
L2  
L1  
1
2
(
HOT)  
1
2
3
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD.  
HEAT/COOL SYSTEMS WITH ONE TRANSFORMER REQUIRE THE FACTORY-INSTALLED JUMPER.  
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.  
M25319  
Fig. 9. Typical hookup of T7350F2010 in three-stage heat and three-stage cool conventional system  
with one transformer.  
TROUBLESHOOTING GUIDE (TABLE 7)  
Table 7. Troubleshooting Information.  
Symptom  
Possible Cause  
Action  
Display will not  
come on.  
Thermostat is not being powered. Check that X terminal is connected to the system transformer.  
Check for 24 Vac between X and RH terminals.  
If missing 24 Vac:  
Check if circuit breaker is tripped; 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.  
Temperature  
display is  
Thermostat is configured for °F or Press both Run Schedule and Copy, then reconfigure the  
°C display.  
display.  
incorrect.  
Bad thermostat location.  
Relocate the thermostat.  
Display shows three dashes and a T7351 is set for remote sensing and sensor is missing or circuit  
degree sign (all systems shut  
down).  
is either open or shorted.  
Temperature  
settings will not were reached.  
change.  
Upper or lower temperature limits Check the temperature setpoints:  
Heating limits are 40 to 90°F (7 to 31°C)  
Cooling limits are 45 to 99°F (9 to 37°C)  
(
Example:  
Occupied setpoint temperature  
range stops were configured.  
Check setpoint stops. If necessary, reconfigure the stop(s).  
Cannot set  
heating higher or  
cooling lower.)  
Keypad is locked. When a locked Press both Run Schedule and Copy, then change keypad lock  
key is pressed, LOCKED appears level.  
momentarily on the LCD.  
Room  
temperature is  
out of control.  
Remote temperature sensing is not Check all remote sensors.  
working.  
11  
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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT  
Table 7. Troubleshooting Information. (Continued)  
Symptom  
Possible Cause  
Action  
Heat will not  
come on.  
No power to the thermostat.  
Check that X terminal is connected to the system transformer.  
Check for 24 Vac between X and RH terminals.  
If missing 24 Vac:  
Check if circuit breaker is tripped; 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 system to respond.  
Configure heating response.  
System selection is set to Off or  
Cool.  
Set system selection to Heat or Auto.  
Cooling will not No power to the thermostat.  
come on.  
Check that X terminal is connected to the system transformer.  
Check for 24 Vac between X and RH terminals.  
If missing 24 Vac:  
Check if circuit breaker is tripped; 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 system to respond.  
Configure cooling response.  
System selection is set to Off or  
Heat.  
Set system selection to Cool or Auto.  
System indicator The call for heat or cool is not yet Check if any stage indicators (dots next to the system  
(
flame: heat,  
given.  
indicator) are displayed. With no display of stage indicators, no  
call for cool/heat is yet given.  
snowflake: cool)  
is displayed, but  
no warm or cool  
air is coming  
from the  
Conventional heating equipment  
turns the fan on only after the  
furnace has warmed to a setpoint.  
Wait one minute after seeing the on indicator and then check  
the registers.  
registers.  
Heating or cooling equipment is  
not operating.  
Verify operation of heating or cooling equipment in self-test.  
Automation and Control Solutions  
Honeywell International Inc.  
Honeywell Limited-Honeywell Limitée  
1985 Douglas Drive North  
35 Dynamic Drive  
Golden Valley, MN 55422  
customer.honeywell.com  
Toronto, Ontario M1V 4Z9  
®
©
U.S. Registered Trademark  
2007 Honeywell International Inc.  
62-0258  
J.I.  
01-07  

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