Honeywell T7351 User Manual 2
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.
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.
— 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.
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 T7770 models with no setpoint adjustment
can be used for temperature averaging.
62-0258
T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT
YES
NO
NO
NO
5 FEET
(1.5 METERS)
T4 T3
T7770A
TT
SUBBASE
T7770A
T
T
Fig. 1. Typical location of thermostat or
remote-mounted sensor.
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.
4. Gently tap anchors (provided) into the drilled holes
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.
T
MOUNTING
HOLES
T7770A
T
T
M19606A
T7770A
M4823A
Fig. 2. Four T7770A Sensors providing temperature
averaging network for T7351 Thermostat.
WALL
ANCHORS
(2)
T
WIRES THROUGH WALL
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.
MOUNTING
SCREWS
M19608
62-0258 2
T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT
A.
ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE.
B.
PRESS LOWER EDGE OF CASE TO LATCH.
M19609
Fig. 4. Mounting thermostat on subbase.
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. Fan On Control Logic.
Occupancy Call for Heat/Cool
Scheduled Sensor Signal Yes No
Occupied Occupied On On
Occupied Standby On
Standby — On On
Not Occupied — On
a
In heat mode, when set for conventional heat, the equipment (i.e. plenum switch) could power the fan despite
the T7351.
Off
Off
a
a
3 62-0258
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)
Temporary Standby
Not Occupied12
System
EmHeat Off CoolAuto
StartTime
MonTue WedTh uFri
Set ScheduleSet
SatSunHol
Dehumid OnAuto
AM
PM
Room
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.
Set Day/Time
Day Time
HEAT COOL
CopyNot OccupiedOccupiedDay
System Fan
Override
Temporary
Occupied
ON AUTO
Temp or ar y
Not Occupied
Run
Schedule
M19610
Setup Using Keypad
The installer uses the Installer Setup to customize the
thermostat to specific systems
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
unavailable for 30 seconds after power up.
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.
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).
a. If you want to save the new configuration, use
the up ! or down " key to change NO to YES
before pressing Run Schedule.
b. If you want the configuration to remain as it was
before starting this change, ensure the
display indicates SAV CFG NO and press Run
Schedule.
NOTE: Installer Setup is automatically exited after five
minutes with no key pressed. Upon this automatic exit, all changes are lost.
62-0258 4
Configuration
Configuration can be done with the keypad using the
Installer Setup (ISU).
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