Honeywell T7351 Owner's Manual

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T7351 Commercial Programmable Thermostat

FOR SINGLE- OR MULTI-STAGE CONVENTIONAL/HEAT PUMP SYSTEMS

INSTALLATION INSTRUCTIONS

APPLICATION

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.

— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall

behind the thermostat.

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 dis­tribution systems. Use shielded cable. The
cable shield must be grounded only at the con­trolled 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.

INSTALLATION

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 installation is complete, check out product
operation as provided in these instructions.

CAUTION

Electrical Shock or Equipment Damage
Hazard. Can shock individuals or short
equipment circuitry.

Disconnect power supply before installation.

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.

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.)

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.

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).

If multiple remote sensors are required, they must be
arranged in a temperature averaging network consisting
of four sensors (See Fig. 2).

NOTE: Only TR21 models with no setpoint adjustment

can be used for temperature averaging.

YES

NO

NO

Fig. 1. Typical location of thermostat or

NO

5 FEET

(1.5 METERS)

remote-mounted sensor.

M4823A

62-0258-05

T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT

Mounting Subbase

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.

• When using remote room temperature and

humidity sensors, thermostat mounting orienta­tion does not matter.

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.

(60.3 mm) between mounting screws in a horizontal
line) with or without adaptive hardware.

1. Position and level the subbase.

NOTE: A level wallplate is only for appearance.

The thermostat functions properly when
not level.

2. Use a pencil to mark the mounting holes. (See
Fig. 3).

3. Remove the subbase from the wall and drill two 3/
16 in. (4.8 mm) holes in the wall (if drywall) as
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

4.

until flush with the wall.

5. Position the subbase over the holes, pulling wires
through the wiring opening.

6. Loosely insert the mounting screws into the holes.

7. Tighten mounting screws.

SUBBASE

T4 T3

TR21

TT

TR21

TT

WIRES THROUGH WALL

MOUNTING
HOLES

WALL
ANCHORS
(2)

MOUNTING
SCREWS

M19608

Fig. 3. Mounting the subbase.

Mounting Thermostat on Subbase (Fig.

4)

With the subbase installed, mount the thermostat:

1. Engage top subbase tabs into the thermostat top.

2. Swing the thermostat down.

3. Press the lower edge of the case to latch.

NOTE: To remove the thermostat from the wall, first pull

out at the bottom of the thermostat; then remove
the top.

A.

ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE.

TR21

TT

Fig. 2. Four TR21 Sensors providing temperature

averaging network for T7351 Thermostat.

62-0258—05 2

TR21

TT

M29184

B.

PRESS LOWER EDGE OF CASE TO LATCH.

M19609

Fig. 4. Mounting thermostat on subbase.

T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT

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.

IMPORTANT

All wiring must comply with local electrical codes
and ordinances.

NOTE: Maximum (and recommended) wire size is 18-

gauge. Do not use wire smaller than 22-gauge.

1. Loosen subbase terminal screws and connect sys­tem wires.

2. Securely tighten each terminal screw.

3. Push excess wire back into the hole in the wall.

4. Plug the hole with nonflammable insulation to pre-

vent drafts from affecting the thermostat.

SETTINGS

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.

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 cooling.
— 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.

Fan Settings

— On: See Table 1.
— Auto: Fan always cycles with call for heat or cool.

— 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.

NOTES: Fan operation can extend (delay Off) after the

heating/cooling turns off:
— Heating choices are 0 or 90 seconds.
— Cooling choices are 0 or 40 seconds.

Table 1. T7351 Intelligent™ Fan ON control logic

Occupancy

Scheduled

Period

Occupied No Sensor Wired Occupied Fan On Fan On

Occupied Motion Sensed Occupied Fan On Fan On

Occupied No Motion Sensed Standby Fan On

Not Occupied No Sensor Wired Not Occupied Fan On

Not Occupied Motion Sensed Not Occupied Fan On

Not Occupied No Motion Sensed Not Occupied Fan On

a

In heat mode, when set for conventional heat, the equipment (i.e. plenum switch) could power the fan despite the
T7350

Motion Sensor

Signal

Effective

Occupancy Yes No

Call for

Heat/Cool

Notes

Effective Occupancy is Standby. Standby
setpoints are used and it assumes that the

a

Fan Off

space is unoccupied. Fan is on only when there
is a call for heating or cooling.

a

Fan Off

Occupancy sensor will only be active during
scheduled Occupied periods. During scheduled

a

Fan Off

Not Occupied periods, the effective occupancy

a

will always be Not Occupied.

Fan Off

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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT

Temperature

Occupied

HEAT HEATCOOL COOL

Not Occupied

Schedule

Clear

Start Time

Fig. 5. Thermostat key locations.

INSTALLER SETUP

For most applications, the thermostat factory settings do
not need to be changed. Review the factory settings in
Table 2.

NOTE: When power is first applied to the thermostat, the

display will show all segments (see Fig. 6).

Table 2. Default Setpoints.

Control Occupied Not Occupied Standby

Heating 70° F (21° C) 55° F (13° C) 67° F (19° C)

Cooling 75° F (24° C) 85° F (29° C) 78° F (26° C)

TemporaryStandby
Not Occupied12

System

EmHeat Off CoolAuto

StartTime

MonTue WedTh uFri

Set ScheduleSet

SatSunHol

Dehumid OnAuto

Room

AM

PM

MinsDays

Fan

%

M19611

Fig. 6. LCD display of all segments.

CAUTION

Possible Equipment Damage.
Fan must be running when system is
operating.

Heat pump and electric heat systems must be
configured correctly to prevent equipment damage
caused by the system running without the fan.

Setup Using Keypad

The installer uses the Installer Setup to customize the
thermostat to specific systems

Set Day/Time

Day Time

System Fan

HEAT COOL

CopyNot OccupiedOccupiedDay

A combination of key presses are required to use the
Installer Setup feature:

1. To enter the Installer Setup, press and hold both the
Run Schedule and the Copy keys until DEGREES
00 (or DEGREES 01) displays.

NOTE: Installer Setup will display WAIT and is

2. To advance to the next Installer Setup number,
press .

NOTE: Pressing Run/Copy again while in this

3. To return to a Setup item, cycle through the options.

4. To change a setting, use the up

5. To exit the Installer Setup, press Run Schedule.

6. Display prompts SAV CFG (save configuration).

a. If you want to save the new configuration, use

b. If you want the configuration to remain as it was

NOTE: Installer Setup is automatically exited after five

minutes with no key pressed. Upon this auto­matic exit, all changes are lost.

Override

Temporary

Temp or ar y

Occupied

Not Occupied

Run

Schedule

ON AUTO

M19610

unavailable for 30 seconds after power up.

mode displays the T7351 firmware version
number.

or down key.

 or down  key to change NO to

the up
YES before pressing Run Schedule.

before starting this change, ensure the
display indicates SAV CFG NO and press Run
Schedule.

Configuration

Configuration can be done with the keypad using the
Installer Setup (ISU).

Table 3. Installer Setup.

Text Default Choices Notes

DEGREES 0 0 -1 Degree Temperature Format

CLOCK 0 0 - 1 Clock Display Format

KEYLOCK 0 0 - 3 Keypad Lockout Level

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0: Degrees F
1: Degrees C

0: 12 hour
1: 24 hour

0: None
1: 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
3: Lockout all keys except Information

T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT

Table 3. Installer Setup. (Continued)

Text Default Choices Notes

HEATPMP 0 0 - 2 Application Type Selection

COOLSTG 1 0 - 4 Number of Cooling Stages

HEATSTG 1 0 - 3 Number of Heating Stages (Not available if Heat Pump is selected)

AUX STG 0 0 - 2 Number of Heat Pump Heating Stages (Only shown when Heat Pump is

AUX CON 0 0 - 3 Aux Contact Functionality

WALLMOD 0 0 - 3 Remote Room Sensor Selection

OATSENS 0 0 - 1 Outdoor Air Sensor Selection

DATSENS 0 0 - 1 Discharge Air Sensor Selection

HUMSENS 0 0 - 2 Room Humidity Sensor selection

OCCSENS 0 0 - 1 Occupancy Sensor Selection

FAN HT 0 0 - 1 Fan Operation on Heat

XFAN HT YES YES or NO Extended Fan on Heat

XFAN CL NO YES or NO Extended Fan on Cool

STRTDEL 0 0 - 15 Sequential Start Delay

ADVANCE NO YES or NO Advanced Settings

0: Conventional
1: Heat Pump - Cooling (Energize O/B on call for cool)
2: Heat Pump - Heating (Energize O/B on call for heat)

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)

0: 0 Stages of Heating
1: 1 Stages of Heating
2: 2 Stages of Heating (This is the max if 4 cooling stages is selected)
3: 3 Stages of Heating

selected)
0: 0 Aux Stages
1: 1 Aux Stages
2: 2 Aux Stages

0: Time of Day
1: Economizer
2: Dehumid - Hot Gas Bypass
3: Simple Dehumid

0: Local sensor only
1: TR21/TR24 and T7770A/D (Remote Sensor, No Remote Setpoint, Bypass 0)
2: TR22/TR23 and T7770B/C (Remote Sensor, Remote Setpoint, Bypass 0)
3: T7771 (Remote sensor, Remote Setpoint, Bypass 1)
(Bypass 0 means that by pressing the override button the thermostat goes from
unoccupied to occupied and the LED will light up and the temporary occupied
timer will begin. If the button is pressed again, the timer will restart.)
(Bypass 1 means that by pressing the override button a second time the
thermostat can return to the unoccupied period.)

0: None
1: Remote Outdoor Air Sensor

0: None
1: Remote Discharge Air Sensor

0: None
1: On Board Sensor
2: Remote Sensor

0: None
1: Remote Occ Sensor

0: Conventional (Equipment controls Fan)
1: Electric (Thermostat turns on Fan with call for Heat)

NO: None
YES: 90 seconds

NO: None
YES: 40 seconds

0 to 150 seconds in 10 second increments

NO: Hide
YES: Show

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