62-0195—08 - T7350 Commercial Programmable Thermostat

T7350 Commercial Programmable
Thermostat
FOR SINGLE- OR MULTI-STAGE CONVENTIONAL/
HEAT PUMP SYSTEMS
INSTALLATION INSTRUCTIONS
APPLICATION
The T7350 Commercial Programmable Thermostat
controls 24 Vac commercial single zone heating,
ventilating and air conditioning (HVAC) equipment. The
T7350 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.
2.
3.
4.
Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
Check ratings given in instructions and on the
product to ensure the product is suitable for your
application.
Installer must be a trained, experienced service
technician.
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.
CAUTION
Equipment Damage Hazard.
Can damage the TIM connection beyond
repair.
Disconnect the TIM cable prior to opening or
closing the thermostat cover.
NOTE: Allow sufficient clearance below the thermostat
to plug in the TIM cable.
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.)
Place Bar Code Here
62-0195-08
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
NOTE: Only TR21 models with no setpoint adjustment
can be used for temperature averaging.
YES
NO
NO
NO
5 FEET
(1.5 METERS)
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.
WIRES THROUGH WALL
M4823A
MOUNTING
HOLES
Fig. 1. Typical location of thermostat
or remote-mounted sensor.
SUBBASE
T4
TR21
T
T
TR21
T
T3
TR21
T
T
WALL
ANCHORS
(2)
MOUNTING
SCREWS
TR21
T
T
M19608
T
Fig. 3. Mounting the subbase.
M29184
Fig. 2. Four TR21 sensors providing temperature
averaging network for T7350 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 even
when not level.
62-0195—08
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.
Wiring
Follow equipment manufacturer wiring instructions when
available. Refer to the Wiring Diagram section starting on
page 8 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 18gauge. 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
prevent drafts from affecting the thermostat.
2
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
A. ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE.
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.
B. PRESS LOWER EDGE OF CASE TO LATCH.
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. Intelligent™ Fan ON control logic
Occupancy
Call for Heat/Cool
Motion
Sensor
Effective
Signal Occupancy
Yes
No
No Sensor Occupied
Fan On Fan On
Wired
Motion
Occupied
Fan On Fan On
Sensed
No Motion
Standby
Fan On Fan Offa
Sensed
No Sensor
Standby
Fan On Fan Offa
Wired
Motion
Standby
Fan On Fan Offa
Sensed
No Motion
Standby
Fan On Fan Offa
Sensed
No Sensor
Not
Fan On Fan Offa
Wired
Occupied
Motion
Not
Fan On Fan Offa
Sensed
Occupied
No Motion
Not
Fan On Fan Offa
Sensed
Occupied
Scheduled
Period
Occupied
M19609
Occupied
Fig. 4. Mounting thermostat on subbase.
Occupied
SETTINGS
Standby
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,
• perform simple configuration.
NOTE: See Fig. 5 for keypad information.
Setting Temperature
Refer to Table 2 for the default temperature setpoints. See
the Product Data (form 63-2605) for complete instructions
on changing the setpoints.
Standby
Standby
Not
Occupied
Not
Occupied
Not
Occupied
a In
heat mode, when set for conventional heat, the equipment (i.e. plenum switch) could power the fan despite
the T7350.
Set Day/Time
Temperature
Occupied
HEAT
Not Occupied
COOL
HEAT
COOL
Day
Time
System
Fan
Run
Copy
HEAT COOL
ON AUTO
Schedule
Schedule
Day
Clear
Occupied Not Occupied Start Time
Override
Temporary Temporary
Occupied Not Occupied
M19610
Fig. 5. Thermostat key locations.
3
62-0195—08
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
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 Set Set Schedule Room
Not Occupied12 StartTime
AM
PM
System
Em Heat
%
MonTueWedThuFri SatSunHol MinsDays
Fan
OnAuto
Off Cool Auto Dehumid
M19611
Fig. 6. LCD display of all segments.
NOTE: Installer Setup is automatically exited after five
minutes with no key pressed. Upon this automatic exit, all changes are lost.
Configuration
Limited configuration can be done with the keypad using
the Configuration ID. In order to determine the proper
codes to use for the Configuration Variables (CnfgID),
spreadsheets of the CnfgID values are available online at
http://customer.honeywell.com/t7350.
A PDA or Honeywell's TStatSpecTM software can be
used, as well. Follow these instructions for identifying the
CnfgID values using TStatSpec.
1. Open the TStatSpecTM software on your PC.
2. Create a new configuration or open an existing configuration.
3. Select the “Configuration Screen” button and configure the settings as desired.
4. Click on the “Configuration ID” button on the bottom
left of the configuration screen.
5. Make note of the values.
6. Press both Copy and Run Schedule on the thermostat.
7. Tap
until C1 appears on the right end of the display.
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. For basic setup functions,
the thermostat can be configured using the keypad.
NOTE: The T7350 has serial communications to
facilitate use of an installer configuration tool.
More advanced features are available using this
tool. (Refer to form 63-2605 for details.)
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 DEG F (or
DEG C) displays.
2. To advance to the next Installer Setup number,
press
.
NOTE: Pressing Run/Copy again while in this
mode displays the T7350 firmware version
number.
3.
4.
5.
6.
4.
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.
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: While stepping toward C1, check other
items to ensure they are set properly. See
Setup Using Keypad section.
8. To adjust each variable to match PDA indication:
a. Hold down the up or down key to adjust
the value quickly.
b. Tap the up or down key for fine control.
9. Tap
to switch to another variable.
10. Return to step 8 and repeat the process until all
configuration values are set properly.
11. To exit the Installer Setup, press Run Schedule.
12. 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.
Setting Keypad Lockout
Proper keypad sequences activate the lockout features.
To change the keypad lockout state:
1. Enter the Installer Setup: press and hold both the
Run Schedule and the Copy keys until DEG F (or
DEG C) displays.
2. Press
until KYLCK displays.
3. Use the up or down key to change the setting. Options are:
• 0: No lockout.
• 1: Lockout all keys except Temporary Occupied,
Temporary Not Occupied, up or down and
.
• 2: Lockout all keys except
.
NOTES:
—
—
Once the proper option is chosen, exit Installer
62-0195—08
Options 1 and 2 do not allow adjustments on
dehumidification high limit.
No options lockout special keypress functions. See the Special Functions section for
details.
Setup by pressing Run Schedule.
4
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
5.
Display prompts SAV CFG. If you want to save it,
use the up or down key to change NO to
YES before pressing Run Schedule again.
Table 3. T7350 Key Function Summary.
Grouping
Information
Button
Down Arrow
Definition
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.
setpoint, day, or time. When setting times or temperatures, hold key
Raises
down to continuously increase value. Also can make temporary change in
temperature setpoint.
Temperature Occupied
Heat
Sets Occupied Heat setpoint.
Occupied
Cool
Sets Occupied Cool setpoint.
Not Occupied
Heat
Sets Not Occupied Heat setpoint.
Not Occupied
Cool
Sets Not Occupied Cool setpoint.
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.
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
Selects not occupied event start times for specified day. Repeatedly press this
key to toggle between two not occupied events.
Clear Start Time
Clears start time for specified period and day.
Copy
Copies schedule from one day to another.
System
Selects System Mode. Toggles through Em Heat, Heat, Off, Cool, and Auto.
Fan
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.)
Set
Override
Schedule
a On: Continuous fan operation during occupied periods. During not occupied periods and standby, 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.
5
62-0195—08
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
Special Functions
Restore Factory Configuration (Run/Clear)
IMPORTANT
This operation erases current configuration and
restores factory defaults for all configuration,
parameters, setpoints and schedules. To regain
the old configuration requires device
reconfiguration.
1.
2.
3.
Press both Run Schedule and Clear Start Time.
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.
Press Run Schedule.
Get Factory Schedule (Info/Clear)
Performing this operation reverts the schedules to the
factory defaults:
1. Press both Info and Clear Start Time.
2. 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.
3. Press Run Schedule.
Test Mode (Occupied/Not Occupied/Schedule Day)
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.
Use 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 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.
Save User Schedule (Info/Copy)
Performing this operation saves the current schedule
(including holidays) to memory, overwriting the old saved
schedule:
1. Press both Info and Copy.
2. The display gives the option to revert to SAV SHD.
a. To save the current schedule, press up or
down until the display indicates YES.
b. To cancel this option, ensure display indicates
NO.
3. Press Run Schedule.
Get User Schedule (Info/Run)
Getting the user schedule restores the schedule
(including holidays) from saved memory, overwriting the
schedule currently in use:
1. Press both Run Schedule and Info.
2. The display gives the option to GET SHD.
a. To retrieve the saved schedule, press up or
down until the display indicates YES.
b. To cancel this option, ensure display indicates
NO.
3. Press Run Schedule.
TROUBLESHOOTING GUIDE (TABLE 4)
Table 4. 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
incorrect.
Room temperature display has been
recalibrated.
Use PDA configuration software to recalibrate as
desired.
Thermostat is configured for °F or °C
display.
Press both Run Schedule and Copy, then reconfigure
the display.
Bad thermostat location.
Relocate the thermostat.
Display shows three dashes and a degree T7350 is set for remote sensing and sensor is missing
sign (all systems shut down).
or circuit is either open or shorted.
62-0195—08
6
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
Table 4. Troubleshooting Information. (Continued)
Symptom
Possible Cause
Action
Temperature
settings will not
change.
(Example:
Cannot set
heating higher or
cooling lower.)
Upper or lower temperature limits were
reached.
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)
Occupied setpoint temperature range
stops were configured.
Using a PDA, check setpoint stops. If necessary,
reconfigure the stop(s).
Keypad is locked. When a locked key is
pressed, LOCKED appears momentarily
on the LCD.
• Use PDA (Set, Display) to unlock keypad.
• Press both Run Schedule and Copy, then change
keypad lock level.
Room
temperature is
out of control.
Remote temperature sensing is not
working.
Check all remote sensors.
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.
Use PDA to configure heating response.
Cooling will not
come on.
System selection is set to Off or Cool.
Set system selection to Heat or Auto.
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.
Use PDA to configure cooling response.
System selection is set to Off or Heat.
System indicator The call for heat or cool is not yet given.
(flame: heat,
snowflake: cool)
is displayed, but
no warm or cool
air is coming from
the registers.
Conventional heating equipment turns the
fan on only after the furnace has warmed
to a setpoint.
Heating or cooling equipment is not
operating.
Set system selection to Cool or Auto.
Check if any stage indicators (dots next to the system
indicator) are displayed. With no display of stage
indicators, no call for cool/heat is yet given.
For T7350M models only: Check the information
screens. A MODHEAT or MODCOOL percentage of
zero indicates a signal of 4 mA from the given terminal.
Wait one minute after seeing the on indicator and then
check the registers.
Verify operation of heating or cooling equipment in selftest.
7
62-0195—08
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
WIRING DIAGRAMS (FIG. 7-14)
SUBBASE
2
X
RH
RC
AUX
W1
Y1
FAN
RELAY
HEAT
RELAY 1
HEAT
RELAY 2
G
COMPRESSOR
CONTACTOR 1
L2
1
L2
1
L1
(HOT)
L1
(HOT)
HEATING
TRANSFORMER
COOLING
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER.
M19764A
Fig. 7. Typical hookup of T7350A in two-stage heat and one-stage cool conventional system
with two transformers.
3
4
5
6
OUTDOOR
AIR
SENSOR
BYPASS
2
SET PT
SENSOR
1
LED
GND
TR23 REMOTE SENSOR
7 8 9 10 11 12
COMPRESSOR
CONTACTOR 2
DISCHARGE
AIR
SENSOR
HEAT
RELAY 2
SUBBASE
T5
T6
T7
T4
T3
OS
OS
AS
AS
X
RH
RC
AUX
W1
W2
Y2
Y1
G
2
HEAT
RELAY 1
3
1
L2
FAN
RELAY
COMPRESSOR
CONTACTOR 1
L2
1
L1
(HOT)
ECONOMIZER
L1
(HOT)
HEATING
TRANSFORMER
COOLING
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER.
3
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.
M32140
Fig. 8. Typical hookup of T7350B in two-stage heat and two-stage cool heat pump system
with two transformers.
62-0195—08
8
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
4
3
5
LED
2
6
OUTDOOR
AIR
SENSOR
BYPASS
SENSOR
1
SET PT
GND
TR23 REMOTE SENSOR
7 8 9 10 11 12
HEAT
RELAY 2
DISCHARGE
AIR
SENSOR
COMPRESSOR
CONTACTOR 2
SUBBASE
T5
T6
T7
T4
T3
OS
OS
AS
AS
W2
Y2
Y1
G
2
X
RH
RC
W1
AUX
FAN
RELAY
HEAT
RELAY 1
COMPRESSOR
CONTACTOR 1
HEAT
RELAY 3
1
L2
L2
1
L1
(HOT)
L1
(HOT)
HEATING
TRANSFORMER
COOLING
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER.
M32141
Fig. 9. Typical hookup of T7350B in three-stage heat and two-stage cool conventional system
with two transformers.
OUTDOOR
AIR
SENSOR
4
3
5
LED
2
6
BYPASS
SENSOR
1
SET PT
GND
TR23 REMOTE SENSOR
AUX HEAT
STAGE 1
DISCHARGE
AIR
SENSOR
7 8 9 10 11 12
COMPRESSOR
CONTACTOR 2
SUBBASE
T5
T6
T7
T4
T3
OS
OS
AS
AS
X
RH
RC
AUX
O/B
W2
Y2
Y1
G
2
CHANGE
OVER
3
1
L2
FAN
RELAY
COMPRESSOR
CONTACTOR 1
L2
1
L1
(HOT)
ECONOMIZER
L1
(HOT)
HEATING
TRANSFORMER
COOLING
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER.
3
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.
M32142
Fig. 10. Typical hookup of T7350B in three-stage heat and two-stage cool heat pump system
with two transformers.
9
62-0195—08
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
4
3
5
OUTDOOR
AIR
SENSOR
BYPASS
2
SET PT
SENSOR
1
LED
GND
TR23-H REMOTE SENSOR
7 8 9 10 11 12
6
HEAT
RELAY 2
DISCHARGE
AIR
SENSOR
COMPRESSOR
CONTACTOR 4
COMPRESSOR
CONTACTOR 2
SUBBASE
T5
T6
T7
T4
HS
HC
T3
OS
OS
AS
AS
HP
M
M
X
RH
W3/Y4 Y3
RC
AUX
W1
W2
Y2
Y1
G
COMPRESSOR
CONTACTOR 3
5
HUMIDITY
SENSOR
3
MOTION
SENSOR
HEAT
RELAY 1
COMPRESSOR
CONTACTOR 1
4
1
L2
2
FAN
RELAY
ECONOMIZER
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD.
3
HEAT/COOL SYSTEMS WITH ONE TRANSFORMER REQUIRE THE FACTORY-INSTALLED JUMPER.
4
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.
5
WHEN USING THE TR23-H FOR HUMIDITY SENSING THERE IS NO NEED TO WIRE HC TERMINAL
BECAUSE THE T3 TERMINAL IS INTERNALLY TIED TO HC, WHICH IS ALSO TIED TO TERMINAL 1
COMMON AT THE SENSOR.
M29254
Fig. 11. Typical hookup of T7350D in two-stage heat and four-stage cool conventional system.
4
3
5
6
MODULATING R
COOL
–
+ (4-20 mA) X
OUTDOOR
AIR
SENSOR
BYPASS
2
LED
SENSOR
1
SET PT
GND
TR23-H REMOTE SENSOR
7 8 9 10 11 12
MODULATING
HEAT
–
+ (4-20 mA)
DISCHARGE
AIR
SENSOR
R
X
SUBBASE
T5
T6
T7
T4
HS
HC
T3
OS
OS
AS
AS
HP
M
M
X
RH
MH
MC
RC
AUX
W1
HEAT
RELAY 1
MOTION
SENSOR
3
1
L2
L1
(HOT)
Y1
G
2
4
HUMIDITY
SENSOR
MX
FAN
RELAY
COMPRESSOR
CONTACTOR 1
L2
1
L1
(HOT)
ECONOMIZER
HEATING
TRANSFORMER
COOLING
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER.
3
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.
4
WHEN USING THE TR23-H FOR HUMIDITY SENSING THERE IS NO NEED TO WIRE HC TERMINAL
BECAUSE THE T3 TERMINAL IS INTERNALLY TIED TO HC, WHICH IS ALSO TIED TO TERMINAL 1
COMMON AT THE SENSOR.
M32143
Fig. 12. Typical hookup of T7350M in two-stage heat (one modulating) and two-stage cool (one modulating)
conventional system with two transformers.
62-0195—08
10
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
3
4
5
LED
2
7 8 9 10 11 12
6
MODULATING R
COOL
–
+ (4-20 mA) X
OUTDOOR
AIR
SENSOR
BYPASS
SENSOR
1
SET PT
GND
TR23-H REMOTE SENSOR
MODULATING
HEAT
–
+ (4-20 mA)
DISCHARGE
AIR
SENSOR
R
X
SUBBASE
T5
T6
T7
T4
EB
EB
HS
HC
T3
OS
OS
AS
AS
HP
M
M
X
RH
MH
MC
RC
AUX
W1
AUX
Y1
HUMIDITY
SENSOR
FAN
RELAY
HEAT
RELAY 1
MOTION
SENSOR
COMPRESSOR
CONTACTOR 1
3
1
G
2
4
LONWORKS®
BUS
LONWORKS®
BUS
MX
L2
L2
1
L1
(HOT)
ECONOMIZER
L1
(HOT)
HEATING
TRANSFORMER
COOLING
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER.
3
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.
4
WHEN USING THE TR23-H FOR HUMIDITY SENSING THERE IS NO NEED TO WIRE HC TERMINAL
BECAUSE THE T3 TERMINAL IS INTERNALLY TIED TO HC, WHICH IS ALSO TIED TO TERMINAL 1
COMMON AT THE SENSOR.
M32144
Fig. 13. Typical hookup of T7350H1017 for system with two independent heat stages (one modulating),
two independent cool stages (one modulating), and two transformers.
3
4
5
6
4
OUTDOOR
AIR
SENSOR
BYPASS
2
LED
SENSOR
1
SET PT
GND
TR23-H REMOTE SENSOR
7 8 9 10 11 12
COMPRESSOR
CONTACTOR 2
ECONOMIZER
DISCHARGE
AIR
SENSOR
HEAT
RELAY 3
HEAT
RELAY 2
SUBBASE
T5
T6
T7
T4
EB
EB
HS
HC
T3
OS
OS
AS
AS
HP
M
M
X
RH
AUX W3/Y4 Y3
RC
AUX
W1
W2
Y2
Y1
G
COMPRESSOR
CONTACTOR 3
5
LONWORKS®
BUS
HUMIDITY
SENSOR
3
MOTION
SENSOR
HEAT
RELAY 1
LONWORKS®
BUS
1
2
FAN
RELAY
COMPRESSOR
CONTACTOR 1
L2
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD.
3
HEAT/COOL SYSTEMS WITH ONE TRANSFORMER REQUIRE THE FACTORY-INSTALLED JUMPER.
4
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.
5
WHEN USING THE TR23-H FOR HUMIDITY SENSING THERE IS NO NEED TO WIRE HC TERMINAL
BECAUSE THE T3 TERMINAL IS INTERNALLY TIED TO HC, WHICH IS ALSO TIED TO TERMINAL 1
COMMON AT THE SENSOR
M32145
Fig. 14. Typical hookup of T7350H1009 in three-stage heat and three-stage cool conventional system
with one transformer.
11
62-0195—08
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
DEHUMIDIFICATION (T7350D,H,M)
There are five methods through which the T7350 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.
Reset Temp SetPt
The room temperature setpoint resets to a specified
number of degrees below the actual setpoint when room
relative humidity (RH) rises above humidity high limit
setpoint.
IMPORTANT
Configurable only with a PDA.
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.
NOTE: The dehumidification high limit can be set within
the range of 10 to 90 percent relative humidity.
Control Through Cooling
NOTE: Hysteresis and a minimum timer prevent the
setpoint from short interval alternation (between
standard and reset setpoints).
Configure using some combination of the following:
— Minimum On.
— Reheat.
— Reset.
NOTES:
—
—
Options Utilizing Auxiliary Output
These methods operate only during cooling.
Selecting both Reheat and Reset options
can cause frequent setpoint adjustments.
This selection is not recommended.
Min. ON Time
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.
NOTES:
—
—
—
Can force wider temperature swings by
cooling 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.
Reheat
Dehumidifies by operating cooling during typical off time.
The T7350 maintains the proper setpoint by running the
heat at the same time.
IMPORTANT
At times during Reheat dehumidification, the
T7350 operates heating and the cooling
simultaneously. This is normal.
NOTES:
—
—
—
As long as RH stays above humidity high limit setpoint,
this setpoint is maintained.
The heat stage never energizes during
Reheat if more than one cool stage is on.
Reheat mode cannot occur during heating.
The T7350M does not support the Reheat
method.
There are two dehumidification options that utilize the
auxiliary output. They are:
— Simple Dehumidification.
— Hot Gas Bypass Dehumidification.
Simple Dehumid(ification)
The auxiliary output:
— Energizes when RH rises above humidity high limit.
— De-energizes when RH drops below humidity high limit.
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.
Dehumid Hot Gas BP
The auxiliary output operates as shown in Table 5.
Table 5. Hot Gas Bypass Dehumidification Logic.
Humidity
Cooling Stages Active Auxiliary Output
High
more than one
De-energized
High
one or less
Energized
Low
more than one
De-energized
Low
one or less
De-energized
Auxiliary output during call for multiple cooling stages for
two reasons:
1. This method assumes that the cooling provides
dehumidification.
2. Multiple cooling stages probably provide necessary
dehumidification.
NOTE: Hysteresis and a minimum timer prevent short
cycling of this output.
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.
62-0195—08 M.S. Rev. 09-10
Printed in U.S.A.