Carrier Thermometer TP NRH A User Manual
TP-PRH-A, TP-NRH-A  
PerformancetSeries  
Edger Thermidistatt Control  
Installation Instructions  
A07049  
A07048  
Programmable Control  
Non−Programmable Control  
Designed and Assembled  
in the USA.  
NOTE: Read the entire instruction manual before starting the installation.  
US patents: US7287709 B2, US20080147242 A1, USD582800 SI, US20060165149 A1, US6956463 B2.  
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INTRODUCTION  
Carrier’s 7−day, 5/2−day, 1−day programmable and non−programmable  
Performance Series Thermidistat Control is a wall−mounted, low−voltage  
control which combines temperature and humidity control in either a single unit  
or a two−piece unit. In two−piece configuration, the relays are located near the  
equipment and a two−wire connection is used between the Display Module and  
the Equipment Control Module. Single−piece installation requires more wiring  
and results in a higher profile. The Edger Thermidistat has no need for batteries  
to store user−configured settings in memory. During power loss its internal  
memory saves settings for unlimited time, and the clock continues to run for at  
least 24 hours. An extension of Carrier’s proven line of thermostats; it provides  
separate setpoints for heating and cooling in addition to humidification and  
dehumidification.  
In the Edge Thermidistat Control programmable configuration, different heating  
and cooling setpoints and times are programmable for 4 periods per day or 2  
periods per day. Programming can be done for 7 days per week, 5/2 days per  
week, or 1 day. The programmable Thermidistat Control can also be user  
configured as a non−programmable Thermidistat Control. When operating as  
non−programmable, the Edge Thermidistat Control will still have both  
temperatureand humidity control.  
The non−programmable Thermidistat Control features Touch ’N’ Got settings  
for quick and easy temperature change without complicated programming  
schedules. The non−programmable Edge Thermidistat Control will still have  
both temperature and humidity control. And, its Touch ’N’ Go technology  
enables the user to switch between three different user−configurable settings  
through intuitive buttons located just below the display.  
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INSTALLATION CONSIDERATIONS  
Power  
This control is powered by 24VAC only. It requires 24VAC (Rh and/or Rc and C  
terminals) of the low−voltage transformer to be connected to it for proper  
operation. It will not operate without these 2 connections. Rh and Rc are  
connected via PCB breakout jumper. See Fig. 1. For applications using two  
24VAC transformers, one in the indoor unit and one in the outdoor unit, connect  
the common from each to the C terminal. Connect R from the indoor unit to the  
Rh terminal. Connect R from the outdoor unit to the Rc terminal. Then, break  
jumper on the circuit board. The W and HUM signals are taken from the Rh  
power and the G signal is taken from the Rc power. If Thermidistat Control has  
been installed in a two−transformer application that is later changed to a  
single−transformer installation, installer must install a field supplied jumper  
between Rc and Rh. Depending on the installation, up to 14 wires may be  
required. Installation as two−piece unit is recommended. Only 2 wires are  
required for connection between Display Module and Equipment Control  
Module. These two wires (V+ and Vg) do not provide ordinary 24VAC. They  
carry a combination of power and communications data that is unique to these  
products.  
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A07052  
Fig. 1 − PCB Breakout Jumper  
Models  
There are programmable and non−programmable models for all applications.  
They can be configured for AC or HP, 1−or 2−speed compressor, and for Hybrid  
Heatt installations, allowing it to be used in place of all Carrier thermostats.  
Programmable Thermidistat Controls may be configured as non−programmable  
if user desires.  
Humidify Equipment and Connections  
The humidify output connects directly to 24VAC operated humidifiers. An  
isolation relay may be required when using powered humidifiers. No other  
connection or interlock is required. Any of several installer−selectable operating  
modes are available.  
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!
WARNING  
ELECTRICAL OPERATION HAZARD  
Failure to follow this warning could result in personal injury  
or death.  
DO NOT connect furnace HUM terminal directly to  
Thermidistat Control HUM terminal. This will bypass furnace  
safety controls. See Low Voltage Wiring Diagrams and notes  
for proper connection.  
Dehumidify Equipment and Connections  
The dry contact output connects to the dehumidify input on variable−speed  
furnaces and fan coils. Additional dehumidification is done by controlling the  
compressor. A variety of operating modes are available. The dry contact must be  
configured for dehumidification in setup Option 19. See Wiring Diagrams for  
more information.  
Outdoor Temperature Sensor (TSTATCCSEN01−B)  
Outdoor air temperature sensor is included in the box with the Thermidistat  
Control. Optimum performance is obtained when an outdoor temperature sensor  
is used with the Thermidistat Control. Plan installation so that 2 wires can be run  
from Equipment Control Module to an outdoor location, preferably on the north  
side of the house or refer to Installation Instructions included with the outdoor  
temperaturesensor for simplified connection. Sensor can be mounted to outdoor  
unit and existing control wires may be used for its connection. Details are  
provided in sensor instructions.  
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Remote Indoor Temperature Sensor  
A remote temperature sensor may be used with the programmable model, where  
it is desirable to install the Thermidistat Control in a limited access location while  
measuring the temperature in the living space. The remote room sensor may be  
used as a stand alone or average with local sensor.  
Two−Piece Thermidistat Control Configuration  
The Performance Series Thermidistat Control can be installed in one of two  
configurations. The control may be installed as a single−piece Thermidistat  
Control or it may be split into two pieces and mounted in separate locations. As  
a single−piece unit, all required wiring must be brought to the Equipment  
Control Module for connection to the terminal strip. In two−piece configuration,  
the Display Module can be mounted in the living space while the Equipment  
Control Module may be mounted near the indoor furnace or fan coil. Connection  
from the Display Module to the Equipment Control Module requires only two  
wires. All other control wires are connected to the Equipment Control Module  
from the HVAC equipment. This configuration results in a slimmer display and  
locates the Equipment Control Module containing the switching relays away  
from the main living space where relay clicking will not be heard.  
The model numbers on the Display Module and the Equipment Control Module  
(ECM) must match or unpredictable results may occur.  
Two−wire pigtail replacement part number is TX−2WR05.  
Wiring  
Wire length should be no more than 250 ft (76 m). Use 22 AWG or larger for  
normal wiring applications. Continuous wire lengths over 100 ft (30.5 m) should  
use 20 AWG or larger.  
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INSTALLATION  
Carton contains the following components. See Fig. 2 for TP−PRH−A or Fig. 3  
for TP−NRH−A.  
A07685  
Fig. 2 − TP−PRH−ACarton Contents  
1. Display Module  
2. Stand−off for Equipment Control Module  
3. Outside Air Temperature Sensor, screws and pigtail  
4. Equipment Control Module  
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A07686  
Fig. 3 − TP−NRH−ACarton Contents  
1. Display Module  
2. Stand−off for Equipment Control Module  
3. Outside Air Temperature Sensor, screws and pigtail  
4. Equipment Control Module  
Thermidistat Control Location  
Thermidistat Control should be mounted:  
S
Approximately 5 ft (1.5m) from floor.  
S
Close to or in a frequently used room, preferably on an inside  
partitioning wall.  
S
On a section of wall without pipes or duct work.  
Thermidistat Control should NOT be mounted:  
S
Close to a window, on an outside wall, or next to a door leading to the  
outside.  
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S
S
S
Exposed to direct light or heat from a lamp, sun, fireplace, or other  
temperature−radiating objects which could cause a false reading.  
Close to or in direct airflow from supply registers and return−air  
registers.  
In areas with poor air circulation, such as behind a door or in an  
alcove.  
Installer should determine whether control will be installed as single−piece or  
two−piece. In single−piece configuration, as many as 14 wires may need to run  
to wall mounting location for connection to the control. In two−piece  
configuration, the Display Module and Equipment Control Module are  
connected by two wires.  
Install Thermidistat Control  
!
WARNING  
ELECTRICAL OPERATION HAZARD  
Failure to follow this warning could result in personal injury  
or death.  
Before installing Thermidistat Control, turn off all power to  
equipment. There may be more than 1 power disconnect.  
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CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment damage  
or improper operation.  
Improper wiring or installation may damage Thermidistat  
Control. Check to make sure wiring is correct before  
proceeding with installation or turning on power.  
1. Turn off all power to equipment.  
2. If an existing Thermidistat Control or thermostat is being replaced:  
a. Remove existing control from wall.  
b. Disconnect wires from existing thermostat, 1 at a time.  
c. As each wire is disconnected, record wire color and terminal marking.  
d. New or additional wires may be needed to accommodate added  
humidity outputs.  
e. Discard or recycle old control.  
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!
CAUTION  
ENVIRONMENTAL HAZARD  
Failure to follow this caution may result in environmental  
damage.  
Mercury is a hazardous waste. Federal regulations require that  
Mercury be disposed of properly.  
Two−Piece Installation  
The following steps should be followed for the installation of the two−piece  
configuration.  
NOTE: The 2−wire pigtail is not intended to support the weight of the Display  
Module. Do not hang the Display Module from the Equipment Control Module  
screw terminals.  
1. Remove mounting plate from back of Display Module by pressing the  
two tabs on the bottom edge and pulling away. See Fig. 4 and 5.  
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A07225  
Fig. 4 − Press Tabs to Remove Backplate  
A07226  
Fig. 5 − Take Apart  
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2. Route wires through large hole in mounting base. Level mounting base  
against wall (for aesthetic value only—Display Module need not be  
leveled for proper operation) and mark wall through 4 mounting holes.  
To avoid unintended bending of wall plate plastic, use all 4 screws and  
anchors. See Fig. 6.  
A07165  
Fig. 6 − Backplate Mounting  
3. Drill four 3/16−in. mounting holes in wall where marked. Thermidistat  
Control may be mounted to a standard junction box, if desired. Hole  
pattern on Thermidistat Control mounting base matches junction box  
mounting holes.  
4. Secure rear plastic mounting base to wall with 4 screws and anchors  
provided. To avoid unintended bending of wall plate plastic, use all 4  
screws and anchors. Make sure all wires extend through hole in mounting  
base.  
5. Adjust length and routing of each wire to reach proper connector block  
and terminal on mounting base with 1/4−in. (6 mm) extra wire.  
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6. Match and connect equipment wires to proper terminals of each connector  
block, being careful not to over tighten the screws. Correct polarity must  
be observed when connecting the two wires from the Equipment Control  
Module to the Thermidistat Control mounting base. If wires are  
connected incorrectly, the Display Module will not operate. See Fig. 7, 8  
and 9.  
A08072  
Fig. 7 − Control Module Wiring Guide  
S
S
Red is V+  
Black is Vg  
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A07166  
Fig. 8 − Secure Wires to Terminal Strip  
A07167  
Fig. 9 − Connect Pigtail Wires to Display Module  
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NOTE: The 2−wire pigtail is not intended to support the weight of the Display  
Module. Do not hang the Display Module from the Equipment Control Module  
screw terminals.  
S
Red of the pigtail is V+  
Black of the pigtail is Vg  
S
7. Push any excess wire into wall and against mounting base. Seal hole in  
wall to prevent air leaks. Leaks can affect operation and cause incorrect  
temperatureand/or humidity measurement.  
8. Make sure to attach 2−wire pigtail to Display Module mounting base. It is  
packed loose in the box from the factory. Then attach 2−wire pigtail to the  
back of the Display Module via 2 pin, keyed connector.  
9. Reattach Display Module body to mounting base by first setting on at top  
of mounting base and then push bottom corners of Display Module to  
snap into place. See Fig. 10.  
A07168  
Fig. 10 − Attach Display to Backplate  
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10. Find suitable indoor mounting location for Equipment Control Module,  
either near or on equipment. See Fig. 11.  
IMPORTANT NOTE: Equipment Control Module should not be mounted  
to duct work or below any other controls or equipment (i.e. humidistat,  
humidifier, etc.).  
A07217  
Fig. 11 − Equipment Control Module on Equipment  
11. Route wires through rear of Equipment Control Module using either a  
clearancehole or supplied standoff. See Fig. 12.  
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A07227  
Fig. 12 − Standoff  
NOTE: Standoffs are provided as an aid when installing Equipment Control  
Module on inside equipment or a solid wall.  
12. Match and connect equipment wires to proper terminals of each connector  
block being careful not to over tighten the screws. Correct polarity must  
be observed when connecting the two wires from the Equipment Control  
Module to the Thermidistat Control mounting base. If wires are  
connected incorrectly, the Display Module will not operate. See Fig. 7, 8  
and 9.  
13. Snap cover over top of Equipment Control Module. See Fig. 13.  
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A07218  
Fig. 13 − Cover on Equipment Control Module  
14. Turn on power to equipment. On power up, all display segments will  
light for 5 sec. For the next 5 sec a 2−digit code appears on large display  
which identifies Thermidistat Control configuration. Refer to Option 33.  
a. AC — 1−stage air conditioner with furnace or fan coil  
b. HP — 1−stage heat pump with fan coil  
c. A2 — 2−stage air conditioner with furnace or fan coil  
d. H2 — 2−stage heat pump with fan coil  
e. hh — Hybrid Heat system with 1−stage heat pump  
f. h2 — Hybrid Heat system with 2−stage heat pump  
g. H — heating only system  
h. C — cooling only system  
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Single−Piece Installation  
The following steps should be followed for the installation of the single−piece  
configuration.  
1. Remove cover from Equipment Control Module by pressing the two tabs  
on the bottom edge and pulling away. Route wires through large hole in  
Equipment Control Module. Level Equipment Control Module against  
wall (for aesthetic value only − Equipment Control Module need not be  
leveled for proper operation) and mark wall through 4 mounting holes.  
2. Drill two 3/16−in. mounting holes in wall where marked. Thermidistat  
Control may be mounted to a standard junction box if desired. Hole  
pattern on Equipment Control Module matches junction box mounting  
holes.  
3. Secure rear plastic Equipment Control Module to wall with 4 screws and  
anchors provided. To avoid unintended bending of wall plate plastic, use  
all 4 screws and anchors. Make sure all wires extend through hole in  
Equipment Control Module.  
4. Adjust length and routing of each wire to reach proper connector block  
and terminal on Equipment Control Module with 1/4−in. (6 mm) extra  
length. See Fig. 14.  
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A07219  
Fig. 14 − Equipment Control Module  
5. Match and connect equipment wires to proper terminals of each connector  
block.  
6. Push any excess wire into wall and against Equipment Control Module.  
Seal hole in wall to prevent air leaks. Leaks can affect operation and cause  
incorrect temperature and/or humidity measurement.  
7. Attach 2−wire pigtail to Equipment Control Module terminal block  
(terminals V+ and Vg). Attach 2−wire pigtail to the back of the Display  
Module via 2 pin, keyed connector.  
8. Reattach Display Module body to Equipment Control Module by first  
setting on at top and then push bottom corners to snap into place. See Fig.  
15.  
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A07220  
Fig. 15 − Reattach Display Module  
9. Turn on power to equipment. On power up, all display segments will  
light for 5 sec. For the next 5 sec a 2−digit code appears on large display  
which identifies Thermidistat Control configuration. Refer to Option 33.  
a. AC — 1−stage air conditioner with furnace or fan coil  
b. HP — 1−stage heat pump with fan coil  
c. A2 — 2−stage air conditioner with furnace or fan coil  
d. H2 — 2−stage heat pump with fan coil  
e. hh — Hybrid Heat system with 1−stage heat pump  
f. h2 — Hybrid Heat system with 2−stage heat pump  
g. H — heating only system  
h. C — cooling only system  
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Set Thermidistat Control Configuration  
Configuration options enable the installer to configure the Thermidistat Control  
for a particular installation. Most are not presented to the homeowner and  
therefore must be properly set by the installer. (Only those marked with an  
asterisk * below are available to the homeowner.) The homeowner  
configurations are described in the owner’s manual. A special procedure allows  
entry into the configuration mode. Selections can be made while in configuration  
mode. Description of each selection and how to use the configuration mode  
follows.  
CONFIGURATION OPTIONS − SUMMARY  
Option 01 — Equipment Type  
Option 02 — Clean Filter Timer Adjustment  
Option 03* — Fahrenheit/Centigrade Selection  
Option 04 — Fan (G) on with W/W1 Selection  
Option 05 — Room Air Temperature Sensing (programmable  
models only)  
Option 06 — Cooling Lockout Below 55_F/13_C Selection (only  
available if outdoor air sensor is present)  
Option 07 — Zoning  
Option 08 — Auxiliary Heat Lockout Temperature Setting (only  
available when heat pump is used and when  
outdoor air temperature sensor is present)  
Option 09 — Heat Pump Lockout Temperature Balance Point (only available  
when outdoor air temperature sensor is present)  
Option 10 — Reversing Valve  
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Option 11 — Adjustable Setpoint Deadband (not available on  
heat only and cool only systems)  
Option 12 — Smart Recovery (programmable models only)  
Option 13 — Room Temperature Offset Adjustment  
Option 14 — Humidity Offset Adjustment  
Option 15 — Enable Auto Mode  
Option 16 — Cycles Per Hour  
Option 17 — Time Between Stages  
Option 18* — Backlight Configuration  
Option 19 — Dry Contact  
Option 20 — Outdoor Air Temperature Offset Adjustment  
Option 21* — Keypad Lockout  
Option 22 — High Cool Latch Temperature  
Option 23 — High Heat Latch Temperature  
Option 24* — Programmable/Non−Programmable  
(programmable models only)  
Option 25* — Number of Programmable Periods per Day  
(programmable models only)  
Option 26 — Minimum Cooling Setpoint  
Option 27 — Maximum heating Setpoint  
Option 28 — UV Light Reminder  
Option 29 — Humidifier Pad Reminder  
Option 30* — Programmable Fan (programmable models only)  
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Option 31* — Daylight Savings Time Configuration  
(programmable models only)  
Option 32 — Furnace Heat Staging  
Option 33 — Single or Two−Piece Installation  
Option 34 — Hybrid Heat Furnace Latch  
Option 40 — Fan Humidify  
Option 41 — Variable Speed Blower  
Option 42 — Variable Speed Super Dehumidification  
Option 43 — Intelligent Heat Staging  
Option 44 — Super Comfort Heat  
Option 99 — Reset to Factory Defaults  
TO ENTER CONFIGURATION MODE  
Press and hold FAN button for approximately 10 sec. The Display Module is  
now in configuration mode. It will automatically exit this mode if no button is  
pressed for 3 minutes. Pressing the DONE button will exit configuration mode  
immediately.  
WHILE IN CONFIGURATION MODE  
The option number is displayed in the heat setpoint location and the  
configuration setting is displayed in the cool setpoint location. On the  
TP−PRH−A(programmable) model, a box will surround the option number. The  
mode button is used to move the box between the two displayed values. The soft  
keys below the listed values may also be used to move the box between selected  
values. The value inside the box is changed by using the UP/DOWN buttons. On  
the TP−NRH−A (non−programmable) model, one of the values will be flashing.  
The mode button is used to change which value is flashing or the Home and  
Sleep buttons may also be used to select which value to flash. The value that is  
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flashing is changed by using the UP/DOWN buttons. All changes made are  
saved at the time of selection and will be saved in the event of the 3 minute  
time−out or when installer exits from configuration menu.  
Configuration Options —Selection  
Option 01 — Equipment Type  
Range: H2, A2, HP, AC, hh, h2, H, C  
H2 — operates a two−speed heat pump with a fan coil  
HP — operates a single−speed heat pump with a fan coil  
A2 — operates a two−speed AC with a fan coil or furnace  
AC — operates a single−speed AC with a fan coil or furnace  
hh — operates a single−speed heat pump with a furnace  
h2 — operates a two−speed heat pump with a furnace  
H
— operates a heat−only system. Furnace or fan coil only;  
no outdoor unit.  
C
— operates a cool only−system. Outdoor AC unit with an  
indoor fan coil with no strip heaters.  
Default is H2.  
Option 02 — Clean Filter Timer  
Select hours of blower operation (heating, cooling, or fan) before CHECK  
FILTER icon is displayed. With OF selected, icon will never come on, disabling  
this feature. Time selection can range from 800 to 7200 hr by selecting numbers  
1 through 9. (Time is 800 X number selected.) Default is 4 (3200 hr).  
Recommended selections are disposable filter−800 to 2400 hr, media filter−2400  
to 3200 hr, or electronic air cleaner−1600 to 2400 hr of blower operation. For  
higher efficiency filter, please consult filter’s Installation Instruction for details.  
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Option 03 — Fahrenheit/Centigrade  
Select between Fahrenheit (F) and Centigrade (C) operation. Factory default is  
Fahrenheit (F).  
Option 04 — Fan (G) On With W/W1  
This selection determines whether fan (G) output is to be On or OFF when any  
W/W1 (furnace or strip heat) output is On. Most furnaces and fan coils manage  
their own blowers and do not require separate G signal. For these applications,  
select OFF. Some auxiliary heaters require separate G signal to turn on blower. In  
this case, select On.  
Default is OF (off).  
Option 05 — Room Air Temperature Sensing (programmable models only)  
The remote room sensor may be installed as a single sensor or multiple sensors  
may be installed for further averaging functionality. See Fig. 16  
RRS  
SRTN  
Sensor 1  
Sensor 2  
Sensor 3  
Sensor 4  
A09130  
Fig. 16 − Remote Room Sensor − Parallel Wiring  
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This selection determines which sensor the control will use for measuring room  
air temperature. Room air temperature can be sensed in one of three ways; the  
local sensor (L) located on the Display Module, the remote room air sensor (r),  
or the average of local and remote sensors (Lr). Settings are L, r, Lr.  
Default is L.  
Option 06 — Cooling Lockout Below 55_F/13_C  
This selection disables cooling when outdoor temperature is below 55_F/13_C.  
It requires an outdoor temperature sensor. Setting is not available if valid outdoor  
sensor is not connected. Set to OF (off) to allow cooling below 55_F/13_C. Set  
to On to prevent cooling below 55_F/13_C.  
Factory default is OF (off).  
Option 07 — Zoning  
This selection should be set to On when the Thermidistat Control is to be used as  
part of a zoning system. It is assumed that the zoning equipment will take care of  
time guard and cycle timers. The minimum On time is still controlled by the  
Thermidistat Control.  
Default is OF (off).  
Option 08 — Auxiliary Heat Lockout Temperature  
This selection is available on heat pump systems with a valid outdoor  
temperature sensor connected. Available settings are: Off, 5, 10, 15, 20, 25, 30,  
35, 40, 45, 50, 55.  
OF (off) − function is disabled. Auxiliary heat is allowed to operate whenever  
sufficient demand for heat is available.  
5 to 55_F (−15 to 13_C) − Outdoor temperature above which the auxiliary heat  
is not allowed to operate (unless MODE is set to Emergency Heat). If room  
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temperaturefalls below 45_F (7_C), the auxiliary heat will be allowed to turn on  
and will continue to run until demand is satisfied.  
Default is OF (off).  
Option 09 — Heat Pump Lockout Temperature Balance Point (only  
available when heat pump is used and when outdoor air temperature sensor  
is present)  
This selection is only available on Hybrid Heat systems. A Hybrid Heat system  
is selected via the Option 1 Equipment Type configuration. Configurations  
settings are: OF (off), 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55.  
OF (off) — the heating cycle will always start with heat pump heating.  
5 to 55_F (−15 to 13_C) — the outdoor temperature below which heat pump  
operation is not allowed.  
When emergency heat mode is selected, only auxiliary heat will operate.  
Default is OF (off).  
Option 10 — Reversing Valve  
This selection is only available on heat pump systems. “O” terminal can be  
configured to be energized in either heating mode or in cooling mode, depending  
on heat pump operation. “O” is used to describe a heat pump system that  
energizes its reversing valve in cooling. “B” is used to describe a heat pump  
system that energized its reversing valve in heating.  
H — Reversing valve output (O/W2/B) is energized when HEAT mode is  
selected.  
C — Reversing valve output (O/W2/B) is energized when COOL mode is  
selected.  
Default is C.  
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Option 11 — Deadband Setting Between Heat & Cool  
This option is not available on Heat Only and Cool Only systems. The selection  
allows the installer to choose how much differential exists between the heating  
and cooling setpoints. Allowable selections are 1 thru 6.  
Default is 2.  
Option 12 — Smart Recovery  
Smart Recovery OF (off) means setpoints change precisely at setback recovery  
time. Thirty, 60, or 90 selects the number of minutes recovery starts before  
programmed recovery time. Recovery takes place smoothly during the selected  
recovery time, ending at the recovery time and temperature which is  
programmed. Not available with non−programmable Thermidistat Controls or  
when Thermidistat Control is configured as non−programmable.  
Default is 90.  
Option 13 — Room Air Temperature Offset Adjust  
The number of degrees to be added to the displayed temperature to calibrate or  
deliberatelymiscalibrate the measured room temperature ( −5 to +5_).  
Default is 0.  
Option 14 — Humidity Display Offset Adjust  
The percentage to be added to the displayed humidity to calibrate or deliberately  
miscalibrate the measured room humidity (−9% to +9% RH).  
Default is 0.  
Option 15 — Enable Auto Mode  
This selection is not available if the Thermidistat Control is configured as Heat  
Only or Cool Only in Option 1. This allows the homeowner to select auto  
changeover mode in addition to heat and cool. This allows the Thermidistat  
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Control to automatically change between heating mode and cooling mode when  
sufficient demand for heating or cooling exists.  
On — Auto mode is available.  
OF — Auto mode is not available.  
Default is On.  
Option 16 — Maximum Cycles Per Hour  
This selection limits the number of cycles per hour that the Thermidistat Control  
allows the system to operate. Selections are 2, 4, 6.  
2 — The heating and cooling outputs will be energized no more than 2 times per  
hour. When an output is energized, it will not be energized again for 30 minutes.  
4 — The heating and cooling outputs will be energized no more than 4 times per  
hour. When an output is energized, it will not be energized again for 15 minutes.  
6 — The heating and cooling outputs will be energized no more than 6 times per  
hour. When an output is energized, it will not be energized again for 10 minutes.  
Default is 4.  
Option 17 — Time Between Equipment Stages  
This selection is only available for heat pump systems. This determines the  
minimum number of minutes of equipment operation on the highest compressor  
stage before allowing the transition to auxiliary heat. Available selections are 10,  
15, 20, and 25. The time between stages of any individual piece of equipment,  
such as low speed and high speed compressor or fan coil stages, will be fixed at  
10 minutes.  
Default is 15.  
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Option 18 — Backlight Configuration  
When OF (off), the backlight will be lit for 10 seconds after a button is pressed.  
After 10 seconds of no button presses, the backlight turns off. When On, the  
backlight will normally be on and dim in appearance. The backlight brightness  
becomes brighter when a button is pressed. After 10 seconds of no button  
presses, the backlight will return to the dimmer level until another button press  
occurs. The range of brightness is 1 through 5 with 5 being full brightness.  
Default is 3.  
Option 19 — Dry Contact Configuration (programmable models only)  
There are 3 available selections, OF, 1 and 2.  
OF — The dry contact is always de−energized.  
1 — The dry contact will be energized for the specified number of minutes per  
hour. This selection is programmable by period. When this selection is changed  
from OF to 1, the period icons are shown and the minute segments of the clock  
display are shown. The triangle icon next to the WAKE period will be on and a  
value between 0 and 60 will be shown in the minutes display. See Operational  
Information and Wiring Diagrams for further explanation of dry contact  
configuration and use. To change the period or minutes, press the soft key below  
the period or minutes and then use the UP/DOWN buttons to change to the  
desired value.  
2 — The dry contact will operate as a DH relay. This relay is reverse logic. When  
the humidity level is above the dehumidify setpoint, the dry contact D1−D2 will  
be opened. When the humidity level is below the dehumidify setpoint, D1−D2  
will be closed. There is a +/− 2% hysteresis around the dehumidify setpoint to  
prevent rapid on/off cycling of the DH output. When configured for  
dehumidification, the Rc terminal must be connected to one of the dry contact  
terminals. This provides power to energize the dehumidify terminal on the  
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cooling equipment when the dry contact is closed. See Wiring Diagrams for  
more information.  
Default is OF (off).  
Option 19 — Dry Contact Configuration (non−programmable models only)  
OF — The dry contact is always de−energized.  
ON — The dry contact will operate as a DH relay. This relay is reverse logic.  
When the humidity level is above the dehumidify setpoint, the dry contact  
D1−D2 will be opened. When the humidity level is below the dehumidify  
setpoint, D1−D2 will be closed. There is a +/− 2% hysteresis around the  
dehumidify setpoint to prevent rapid on/off cycling of the DH output. When  
configured for dehumidification, the Rc terminal must be connected to one of the  
dry contact terminals. This provides power to energize the dehumidify terminal  
on the cooling equipment when the dry contact is closed. See Wiring Diagrams  
for more information.  
Default is OF (off).  
Option 20 — Outdoor Air Temperature Offset Adjustment  
This selection allows the calibration, or deliberate miscalibration of the outdoor  
air temperature sensor reading. The selection ranges from −5 to +5_.  
Default is 0.  
Option 21 — Keypad Lockout (programmable models only)  
This selection allows the installer to limit access to the keypad. Selections are OF  
(off), 1, 2, 3. These options are independent of Option 24, which allows the  
programmable model to be configured as a non−programmable thermostat.  
OF (off) — The user has full access to the keypad.  
1 — The user has access to change the setpoints, time of day and calendar.  
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2 — The user has access to change the setpoints only.  
3 — The entire keypad is locked. When a button is pressed, the backlight will  
turn on but none of the operating parameters will be changed.  
When the keypad lock selection is turned on, the padlock icon will be displayed.  
To unlock the keypad, press and hold the UP/DOWN buttons simultaneously for  
five seconds. When the keypad is unlocked, the padlock icon will turn off. The  
keypad will remain unlocked for two minutes after the last button press. After  
two minutes with no button presses, the keypad will lock again. The keypad will  
not lock in the software configuration mode or in the installer test mode.  
Default is OF (off).  
Option 21 — Keypad Lockout (non−programmable models only)  
This selection allows the installer to limit access to the keypad. Selections are OF  
(off), 1, 2.  
OF (off) — The user has full access to the keypad.  
1 — The user has access to modify Home, Sleep, Away, and UP/DOWN  
setpoints.  
2 — The entire keypad is locked. When a button is pressed, the backlight will  
turn on but none of the operating parameters will be changed.  
When the keypad lock selection is turned on, the padlock icon will be displayed.  
To unlock the keypad, press and hold the UP/DOWN buttons simultaneously for  
five seconds. When the keypad is unlocked, the padlock icon will turn off. The  
keypad will remain unlocked for two minutes after the last button press. After  
two minutes with no button presses, the keypad will lock again. The keypad will  
not lock in the software configuration mode or in the installer test mode.  
Default is OF (off).  
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Option 22 — High Cool Latch Temperature (only available if outdoor  
sensor is present)  
An outdoor sensor is required for high cool latch feature.  
This selection is only available when Option 1 is set to H2, A2, or h2 and when  
Option 7 (zoning) is set to OF (off). Configuration settings are OF (off), 80, 85,  
90, 95, 100, 105, 110, On.  
OF (off) — Cooling always starts in low stage (Y1) and stages up to high stage  
(Y1 and Y/Y2) when demand is sufficient and staging timer constraints have  
been satisfied.  
80 to 110_F (27 to 43_C) — Outdoor temperature above which both first and  
second stages of the compressor are energized to satisfy all cooling demands.  
When a cycle starts under a high cool latch, it will finish the cooling cycle on  
high stage. If the cooling equipment is energized to satisfy a dehumidify demand  
only (no cooling demand), the latch will not be applied.  
On — The Y1 and Y/Y2 outputs are simultaneously energized to satisfy all  
cooling demands.  
Default is OF (off).  
Option 23 — High Heat Latch Temperature (only available if outdoor  
sensor is present)  
This selection is only available when Option 1 is set to H2, or h2 and Option 7  
(zoning) is set to OF (off). Configuration settings are OF (off), 20, 25, 30, 35, 40,  
45, 50, On.  
OF (off) —Heating always starts in low stage (Y1) and stages up to high stage  
(Y1 and Y/Y2) when demand is sufficient and staging timer constraints have  
been satisfied.  
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20 to 50_F (−7 to 10_C) — Outdoor temperature below which both first and  
second stages of the compressor are energized to satisfy all heating demands.  
When a cycle starts under a high heat latch, it will finish the heating cycle on  
high stage.  
On — The Y1 and Y/Y2 outputs are simultaneously energized to satisfy all  
heating demands.  
Default is OF (off).  
Option 24 — Programmable/Non−Programmable (programmable models  
only)  
This selection allows the installer to configure the Thermidistat Control as either  
programmable or non−programmable. Selections are P, nP.  
Default is P.  
Option 25 — Number of Programmable Periods (programmable models  
only)  
This selection allows the installer to configure the Thermidistat Control for two  
or four periods per day. Two periods is a common commercial application and  
four periods is more common for residential. This selection is not available if  
Option 24 has been set to nP to configure the Thermidistat Control for  
non−programmableoperation.  
2 — Periods DAY and SLEEP are available  
4 — Periods WAKE, DAY, EVE, and SLEEP are available.  
Default is 4.  
Option 26 — Minimum Cooling Setpoint  
This selection allows the installer to configure the minimum cooling setpoint that  
the user is allowed to set. The range is based on the value of the adjustable  
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deadband Option 11, such that the minimum of the range is 50_F/10_C plus the  
adjustable deadband and the maximum is 90_F/32_C.  
Default is 52_F/11_C (based on the adjustable deadband default = 2).  
Option 27 — Maximum Heating Setpoint  
This selection allows the installer to configure the maximum heating setpoint.  
The range is based on the adjustable deadband value Option 11, such that the  
minimum of the range is 50_F/10_C and the maximum is 90_F/32_C minus the  
deadband.  
Default is 88_F/31_C (based on the adjustable deadband default = 2).  
Option 28 — UV Light Reminder  
This selection allows the installer to select the number of months after which the  
UV Light icon will be displayed to indicate to the homeowner that it is time to  
call the dealer to have the UV Lights replaced. Selections available are OF (off),  
6, 12, 18, 24, 30, 36, 42, 48.  
OF (off) — The UV Light reminder is turned off and will never be displayed.  
6−48 — The number of months after which the UV Light reminder will be  
displayed, “CHECK UV LIGHT”.  
Default is OF (off).  
Option 29 — Humidifier Pad Reminder  
This selects the number of months after which the Humidifier Pad Reminder  
icon will be displayed. This is not based on run time.  
OF (off) — The Humidifier Pad Reminder is disabled and will never be  
displayed.  
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1−24 — The number of months after which the Humidifier Pad Reminder icon  
will be displayed, “CHECK HUM PAD”.  
Default is OF (off).  
Option 30 — Programmable Fan (programmable models only)  
This selection allows the homeowner to program the fan selection to “Auto” or  
“On” fan operation for each of the program schedule periods. This selection is  
only available on programmable Thermidistat Controls.  
OF (off) — Programmable fan is disabled and the homeowner must manually  
select “Auto” or “On” for fan operation.  
On — Programmable fan is enabled. The homeowner can program “Auto” or  
“On” fan operation along with the heat and cool setpoints for each programmed  
period. When the program schedule is running, the programmed heat setpoint,  
cool setpoint, and fan selection for that period will be used. If the homeowner  
“overrides” the programmed fan setting by pressing the fan button, the override  
selection will remain in effect until the next programmed period time.  
Default is OF (off).  
Option 31 — Daylight Savings Time Configuration (programmable models  
only)  
This selection allows the installer to set the Thermidistat Control to automatically  
change by one hour on the specified day, month, and week specified.  
OF (off) — Daylight Savings Time Function disabled.  
1,2 On — The first time the UP/DOWN button is pressed, the value of this  
selection changes from OF (off) to 1. When 1 is displayed, the days of the week  
and clock digits will be turned on. The installer will set the start date (Spring) for  
Daylight Savings Time by setting the day of the week by selecting the  
appropriate triangle icon next to the days of the week, the month of the year will  
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be set in the clock hours location (range 1−12) and the week of the month will be  
set in the clock minutes location. The week of the month selections will be F, 2,  
3, 4, and L for First, 2nd, 3rd, 4th, and Last. So for the first Sunday in April, the  
display would show SUN, 4, F. When 2 is displayed, the installer will then  
choose the end date for daylight savings time (Fall). To activate the function, the  
installer changes the “2” by pressing the up button and “On” is displayed. The  
setting shall be left “On” to enable the Daylight Savings Time function.  
Default is On (on).  
Option 32 — Furnace Heat Staging Control (available only when the  
Thermidistat Control is configured to operate AC or A2 equipment).  
1 — Thermidistat Control controls W1 output only and furnace controls the turn  
on and turn off of higher stages of heat.  
2 — Thermidistat Control will control the W1 and O/W2/B outputs.  
Default is 1.  
Option 33 — Single or Two−Piece Installation  
This configuration allows the Thermidistat Control to compensate for the  
amount of heat generated by the Thermidistat Control electronics to allow more  
accurate sensing of the temperature sensor. The amount of heat compensation  
will be different between single installation and two−piece installation.  
Range: 1P or 2P  
1P — The installation is single piece.  
2P — The installation is two separate pieces.  
Default is 2P.  
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Option 34 − Hybrid Heat Furnace Latch  
This selection allows a Hybrid Heat system to finish a heating cycle using the  
furnace.  
On − Once the furnace is on, it will finish the heating cycle with the furnace. If a  
heat pump defrost occurs, the heating cycle will finish with the furnace.  
OF − The system will stage from furnace back to heat pump if heating demand  
dictates, or 2 minutes after a defrost has ended.  
Default is On.  
Option 40 — Humidify Fan  
This selection controls whether humidification can only be done when a heating  
demand is present. If the homeowner turns humidification OFF, this  
configuration operates as if the selection was set to OFF.  
OF − The humidity output will only energize when there is a humidity demand  
and the heating equipment is energized.  
On − The humidity output and the fan will energize anytime humidification is  
needed during heating mode regardless of the state of the heating equipment.  
Factory default is OF (Off)  
Option 41 — Variable Speed Blower  
This selection allows the installer to select between a single speed or variable  
motor. In a system with a two speed compressor (A2, h2, H2), if a  
dehumidification demand exists and the compressor is energized for cool to  
dehumidify, cooling, or both, and the system has a PSC blower (Option 41 =  
OFF), then both Y/Y2 and Y1/W2 are energized.  
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Off − The system has a single speed (PSC) blower.  
On − The system has a variable speed blower.  
Factory default is OF (Off)  
Option 42 — Variable Speed Super Dehumidification  
This option will only be available if the Variable Speed Blower setup (Option  
41) has been set to ON.  
OF − The fan output (G) is energized when the compressor is on for cool to  
dehumidify functionality.  
On − The fan output (G) is de−energized when the compressor is running for  
cool to dehumidify functionality. In this setup the fan will run at very low speed  
because a Y/Y2 or Y1/W2 is present but the G signal is not. The fan output (G)  
will be energized any time the compressor is energized in response to a cooling  
demand.  
Factory default is OF (Off)  
Option 43 — Intelligent Heat Staging  
This function is only available if the equipment configuration is a single speed  
heat pump (Option 01 = HP).  
Off − Electric heat will not be staged.  
On −Three stages of electric heat will be staged.  
This switch should be set to On if the HVAC equipment has two banks of strip  
heaters. When electric heat is required, the thermostat will energize the smallest  
bank first (W1 only), then the larger bank (turning the smaller bank off − Y1/W2  
only), and then both banks together (both W1 and Y1/W2). When power is  
cycled to the thermostat, this unit configuration will be displayed as HS.  
Factory defaults is OF (Off)  
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Option 44 — Super Comfort Heat  
This option is only available on heat pump units HP (HP, H2, hh, and h2) when  
Option 41 (Variable Speed Blower) is set to On and the system has a valid OAT  
sensor.  
OF (Off) − Comfort Heat is off  
On − Comfort Heat feature is on.  
If the outdoor air temperature is between 12 to 40_F (−11 to 4_C) and the  
compressor is running in heating, then the fan output is turned off. This will  
signal the variable speed blower to reduce the air speed. The fan output is turned  
off even if the user has the fan selection set to continuous fan. The fan output  
will be turned back on in this temperature range if the maximum capacity of  
auxiliary heat is on due to system demand (auxiliary heat on in response to a  
defrost signal shouldn’t cause the fan to turn back on).  
If the outdoor air temperature is below 12_F/−11_C and there is sufficient  
demand for the equipment to be on, then the fan output is turned back on and the  
W/W1 output is energized. In a two speed unit the Y/Y2 output should be  
energized in addition to the W/W1 output. This logic does not apply to a Hybrid  
Heat system. In the unlikely event that the installer has selected a heat pump  
lockout temperature (Option 09) of 5_F/−15_C in a Hybrid Heat system and the  
comfort heat feature is on, then the comfort heat feature will turn the W/W1 on  
and the compressors off when the outdoor air temperature drops below  
12_F/−11_C instead of at the lower temperature of 5_F/−15_C.  
NOTE: All temperature boundaries have a +/− 2_ hysteresis  
Factory default is OF (Off).  
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Option 99 — Reset to Factory Defaults  
Use this capability to reset the Thermidistat Control to “out of the box”  
conditions. BEWARE! All configuration settings, program settings, clock, and  
calendar which have been manually entered will be lost!  
When this option is selected, the configuration number (99), will appear on the  
left and 10 will appear on the right. To perform the reset, first use the MODE key  
to move the box from the 99 to the 10 (programmable model) or to flash the 10  
(non−programmable model). Then press and hold the DOWN key. The 10 will  
start counting down toward zero. If the DOWN key is kept pressed until the  
count reaches zero, the reset will be performed. When the value reaches zero, the  
heat setpoint shall display −−. The cool setpoint shall display − and the room air  
temperature shall display Fd. When the factory defaults have been restored, the  
Thermidistat Control will act as if power was cycled and return to normal  
operation. If the DOWN key is released early, the number will return to 10 and  
the reset will not occur.  
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SYSTEM START−UP AND CHECKOUT  
The Thermidistat Control is designed with a built−in installer test capability. It  
allows easy operation of equipment without delays or setpoint adjustments to  
force heating or cooling. To enable installer test mode, press and hold the fan  
button for 15 seconds. After 10 seconds, the Thermidistat Control will enter  
Configuration Mode. Continuing to hold the Fan button through 15 seconds will  
cause the Thermidistat Control to enter Installer Test Mode. Pressing the Mode  
button will change the system operating mode to test the heating and cooling  
equipment. Auto Mode is not available during Installer Test Mode. If no buttons  
are pressed for 15 minutes, the installer test mode will be terminated. Pressing  
DONE at any time will exit installer test mode.  
Heat − The first stage of heating will be energized for three minutes, then the first  
and second stages (if a second stage exists) will turn on for an additional three  
minutes. During the first stage of heating, the HEAT ON icons will be displayed.  
During the second stage of heating (if one exists), the “2” next to the “On” will  
be displayed if the system has a two−stage compressor (A2, h2, or H2 unit  
types). The “auxiliary heat on” icon will be displayed if the second stage is  
electric heat (HP unit type). While the heating test is active, the humidify output  
can be toggled. On the programmable models, pressing the button below the  
humidify icon shall toggle the state of the humidify output. On the  
non−programmablemodels, pressing the features button shall toggle the state of  
the humidify output.  
Installer test for cooling is the same as described for heating above. COOL ON  
will be displayed during cooling in Installer Test Mode. While the cooling test is  
active, the dehumidify icon shall be displayed if the dry contact has been  
configured as a DH output. On the programmable models, pressing the button  
below the dehumidify icon shall toggle the state of the dry contact output. On the  
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non−programmablemodels, pressing the features button shall toggle the state of  
the dry contact.  
In a heat pump application, when the mode is set to “em heat” the auxiliary heat  
will turn on for 3 minutes. The clock display will count down from 180 to 0  
during this test.  
TO TEST FAN  
Fan button switches FAN icon between AUTO and On. While On is displayed,  
G output will be energized, turning fan on. On some fan coils, fan continues to  
operate for 90 sec after G signal is removed.  
Final Settings  
Be sure to press DONE to exit installer setup mode. If the system is to be left in  
operation after installation is complete, use MODE button to select between  
HEAT, COOL, or AUTO to provide desired operation of heating, cooling, or  
auto.  
On the programmable models, the default setpoints and programmed schedule  
conform to the Energy Starr requirements of the U.S. Department of Energy for  
both heating and cooling. These provide energy saving temperature settings.  
Refer to Table 1.  
Table 1 – Energy Star Default Schedule  
SCHEDULE  
Wake 6:00 AM  
HEAT  
COOL  
68_F/20_C  
60_F/16_C  
68_F/20_C  
60_F/16_C  
78_F/26_C  
85_F/29_C  
78_F/26_C  
82_F/28_C  
Day 8:00 AM  
Evening 5:00 PM  
Sleep 10:00 PM  
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If the programmed schedule is to be used, make sure the triangle icon next to the  
FOLLOW SCHEDULE icon is turned on. Pressing the Schedule button will  
cycle the triangle icon through the FOLLOW SCHEDULE, HOLD and  
VACATION selections.  
If fixed temperatures are desired, use SCHEDULE button to turn on arrow icon  
next to HOLD. This will maintain setpoints, not allowing them to change with  
programmed schedule.  
The FAN button may be used to select between AUTO (fan on only with  
equipment) and On (fan on continuously) fan modes. For further information on  
temperature selection and programming, refer to Homeowner’s Guide.  
Setting The Clock, Calendar, Daily Schedule, and Vacation  
Settings (programmable models only)  
To set the clock, press the SET button once. The Clock will be displayed at the  
bottom center of the screen. Use the soft keys to move the box around the digits  
to be set and the UP/DOWN buttons to change the setting. Concurrent presses of  
the set button will cycle through the calendar, daily schedule, and vacation  
settings.  
Calendar may be changed by using the soft keys to select the Month, Day, or  
Year. The UP/DOWN buttons are used to change the Month, Day, or Year setting  
when the box surrounds it. Day of the week (Mon−Sun) is determined by  
calendar settings and is not directly adjustable.  
When changing daily schedule settings, the soft keys are used to set the days,  
period times, heating setpoints, and cooling setpoints. The UP/DOWN buttons  
are used to change the setting with the box around it. ALL PROGRAM  
PERIODS (WAKE, DAY, EVE, SLEEP) MUST OCCUR WITHIN THE SAME  
24 HOUR PERIOD.  
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When changing Vacation settings, the soft keys are used to choose the selection  
to be adjusted and the UP/DOWN buttons are used to change the setting.  
Humidify setting may only be changed when heat mode is selected and  
Dehumidify setting may only be changed when cool mode is selected.  
Humidity Control Features  
The various humidity control features of the Thermidistat Control are explained  
below. They are grouped into 2 sections, humidification and dehumidification.  
Instructions on how to select each feature are given at the end of each section.  
Humidification  
The Thermidistat Control directly connects to a standard 24VAC humidifier to  
control humidification in the home. A humidify setpoint between 10 and 44% in  
2% increments relative humidity is selected by the homeowner, or all  
humidification can be turned off. When humidity in home drops below setpoint,  
humidifier will be turned on to raise humidity level. Humidification can only  
occur while in heating mode. See Table 2 for reference.  
Table 2 – Humidification Selections  
HUMIDIFY SETPOINT  
SELECTION  
FAN DISPLAY  
DISPLAY  
10-44  
1
Normal Humidify  
Auto Humidify  
Humidify Off  
Blank  
AUTO  
Blank  
OF (Off)  
1. Humidify  
In normal humidify, humidifier will be on if there is humidity demand  
and any heating equipment is on. This will include furnace, heat pump, or  
auxiliary heat.  
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2. Auto Humidify  
Thermidistat Control will automatically adjust the humidity setpoint  
according to the outdoor temperature. As the outdoor temperature  
decreases,the humidity setpoint also decreases. Settings ranging from 1 to  
9, 1 being the lowest and 9 the highest, will be visible to the homeowner.  
See Fig. 17 for outdoor temperature/indoor humidity relationship in auto  
humidify mode.  
3. Humidify Off  
The humidify function can be turned off completely. This does not  
require changing existing setpoints.  
To Select Humidification (programmable)  
Press the soft key below the humidify icon to bring up humidity select screen.  
Humidify options are only available when in Heating mode. When system is in  
AUTO mode, humidify options are available if the last system operation was a  
call for heat.  
To Select Humidification (non−programmable)  
Press the features button twice. The first press displays the outdoor air  
temperature and the second press displays the humidity value and humidify  
target.  
Pressing the mode button shall cycle through the available humidification  
selections(Off, Humidify and Auto Humidify).  
Additional Humidify Comments  
The humidifier is actually turned on when humidity is 1% below setpoint and  
turned off when it reaches 1% above setpoint. This built−in hysteresis prevents  
humidify output from toggling on and off when humidity level is near setpoint.  
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Dehumidification  
Dehumidification is done only during cooling. Depending on type of equipment  
used, compressor speed, blower speed, setpoint adjustment, and equipment  
cycling are modified to provide added dehumidification. A dehumidification  
setpoint (separate from humidification setpoint) is available to the homeowner. It  
can range from 46% to 66% relative humidity. When actual humidity is higher  
than setpoint, a dehumidification demand exists. The Thermidistat Control  
responds by activating the dry contact (when enabled in Option 19). It may also  
control the compressor and blower, depending on equipment type and  
dehumidify selection choice. The 3 available selections are described below. A  
mandatory 5 minute blower off delay will be enforced if there has been a call for  
dehumidification during a cooling call. The amount of extra dehumidification  
available is very dependent on the type of equipment in the home. Without a  
variable−speed blower, the system’s ability to adjust dehumidification is very  
limited.  
1. Normal Dehumidify Operation  
When normal dehumidify is selected, the compressor will not turn on  
without a cooling demand. If dehumidify demand exists while cooling,  
dry contact will also be active (24VAC removed). This output commands  
variable−speed blowers to reduce their airflow, which improves water  
removal from the cooled air.  
2. Cool to Dehumidify  
The cool to dehumidify selection tells the system to operate the  
compressor, within limits, when there is a dehumidify demand even if  
there is no cooling demand. The limits are that the system may overcool  
up to 3_, but no more, while attempting to satisfy a dehumidify demand.  
Within this 3_ range, there is an additional balance between overcooling  
and humidity satisfaction. When overcooling must occur, the dehumidify  
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setpoint is adjusted upward by 2% per degree of overcooling. For  
example, a cooling setpoint of 76_F/24_C and a dehumidify setpoint of  
60% is equivalent to a cooling setpoint of 75_F/24_C and a dehumidify  
setpoint of 62%. This dehumidify setpoint change is internal to the  
Thermidistat Control and is not shown on the display.  
A06599  
Fig. 17 − Auto Humidity  
3. Dehumidify Off  
Dehumidification can be turned off completely. This can be done without  
changing existing setpoints.  
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To Select Dehumidification (programmable − between NORMAL, COOL  
TO, and OFF)  
Press the soft key below the dehumidify icon button to bring up dehumidify  
selections. Dehumidify options are only available when in Cooling mode. When  
system is in AUTO mode, dehumidify options are available if the last system  
operation was a call for cooling.  
To Select Dehumidification (non−programmable − between NORMAL,  
COOL TO, and OFF)  
Press the features button three times. The first press displays the outdoor air  
temperature, the second press displays the humidify options and the third press  
will display the current dehumidify selections.  
The mode button is used to cycle through the dehumidify selections.  
Additional Dehumidify Comments  
Dehumidification can be enhanced (with some efficiency loss) by turning blower  
off immediately at the end of each cooling cycle (eliminating normal 90 sec  
blower off delay). Where maximum humidity removal is desired, this should be  
done. Fan coils have the capability of removing this off delay. On FK or FV Fan  
Coils, set delay tap to 0/0. On standard fan coils, a jumper can be cut to disable  
off delay. Refer to fan coil Installation Instructions for details. If FAN is set for  
continuous operation (fan On icon displayed), G output is turned off for 5  
minutes at the end of each cooling cycle as long as dehumidify demand exists.  
Like humidify, dehumidify actions are initiated when humidity is 1% above  
setpoint and are terminated when humidity drops to 1% below setpoint. This  
prevents unnecessary toggling of dehumidify actions when humidity is near  
setpoint.  
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Dehumidify Output and Equipment Connections  
When there is a dehumidify demand, dry contact is activated, meaning that a  
24VAC signal is removed from the DHUM or DH output terminal. In other  
words, dehumidify output logic is reversed − output is turned On when no  
dehumidify demand exists and is turned OFF when demand exists.  
Carrier FK and FV series variable−speed fan coils, all variable−speed furnaces,  
and select single and multi−stage furnaces with the dehumidify connection have  
dehumidify inputs which connect directly to Thermidistat Control dry contact.  
Refer to the furnace literature for dehumidification options.  
The FK and FV series fan coils have a terminal marked DH which should be  
connected to the Thermidistat Control dry contact output. Jumper J1 on fan coil  
MUST be removed. It is located behind the DH terminal. Additionally blower  
delay tap on fan coil should be set to 0/0 (no On delay and no OFF delay) when  
using cool to dehumidify. With this selection, the blower stops when G signal is  
removed, preventing re−evaporation of water from the coil which would occur  
during the normal 90 sec blower off delay. See fan coil installation instructions  
for more information.  
The furnace dehumidify input acts differently depending on which style of  
variable speed, select single−stage or multi−stage furnace control you have.  
Vacation (programmable models only)  
A vacation selection is available specifically for times where the home will not  
be occupied for an extended period. Vacation mode has an automatic hold,  
meaning that setpoints are not affected by the programmed schedule. Vacation  
mode is active for a specified period of time. While in vacation mode, the system  
provides temperature and humidity protection for the home in the selected mode,  
but not comfort. When vacation mode is active, an arrow will be displayed  
beside “VACATION” in the upper left corner of the display.  
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Vacation Setpoints  
A special set of temperature and humidity setpoints exist which are active in  
vacation mode. They are adjustable by the homeowner, are exclusively for  
vacation mode, and are remembered from one vacation selection to the next. See  
Table 3 for default values.  
Table 3 – Vacation Setpoints Default Values  
MODE  
Fan  
AUTO  
Auto  
Heat Setpoint  
Cool Setpoint  
Humidify Setpoint  
Dehumidify Setpoint  
55_F/13_C  
85_F/29_C  
20_F/−7_C  
60_F/16_C  
Vacation Humidification  
Normal humidify is available using vacation setpoints. Auto humidification is  
available, adjusting its setpoint with outdoor temperature the same as when  
occupied. Vacation humidification can be turned off independently of occupied  
humidification. While setting the Vacation setpoints, the Vacation humidify  
setpoint is accessible by pressing the soft key below the humidify icon when the  
box is around the heating setpoint.  
Vacation Dehumidification  
Normal Dehumidify, Cool to Dehumidify, and Dehumidify OFF are all available  
in vacation mode, and selection of one of these can be different from that of  
occupied. Vacation dehumidification selection and setpoints are remembered the  
next time vacation is used. While setting Vacation setpoints, the Vacation  
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dehumidify setpoint is accessible by pressing the soft key below the dehumidify  
icon when the box is around the cooling setpoint.  
OPERATIONAL INFORMATION  
Timers  
Five−MinuteCompressor Timeguard  
This timer prevents compressor from starting unless it has been off for at least 5  
minutes. It can be overridden for 1 cycle by simultaneously pressing FAN and  
UP buttons.  
Cycle Timer  
Based on the selection of 2, 4, or 6 cycles per hour, this timer is set to 30, 15, or  
10 minutes. This much time must elapse from the start of one cycle before  
another cycle can start. It serves to impose the cycles per hour limits. It can be  
defeated for one cycle by simultaneously pressing the FAN and UP buttons.  
Ten−MinuteStaging Timer  
In multistage heating or cooling, this timer prevents any higher stage from  
turning on until preceding stage has been on for 10 minutes. When staging  
between compressor and electric heat or between compressor and furnace heat,  
the time is configurable. The timer is configurable via Option 17. This timer is  
overridden if temperature error is greater than 5_ (usually due to a large change  
in desired temperature) and equipment stages up in 60 second intervals.  
The ten−minute staging timer does not require the thermostat to change to a  
higher stage after 10 minutes. If the system is able to meet the demand (maintain  
setpoint) it may not change stages after the 10 minute timer has expired. If there  
is sufficient demand for a higher stage at the end of 10 minutes or at any time  
after the 10 minute timer has expired, the thermostat will energize the next higher  
stage.  
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Defrost  
When defrost occurs in a Hybrid Heat system, the furnace will operate during the  
defrost cycle. At the end of the defrost cycle, the furnace and heat pump will be  
de−energized while the fan is energized for 2 minutes allowing the heat  
exchanger to cool down. If Option 34, Hybrid Heat Furnace Latch is set to Off,  
at the end of the 2 minute time, the heat pump will be re−energized if a call for  
heat still exists. If Option 34 is set to On (default), the furnace will remain on  
until the end of the heating cycle.  
Defrost detection is not available if the installer has configured the O/W2/B  
output to function as a B output. During heat pump heating, a defrost signal shall  
be considered valid if the compressor output is energized and the defrost signal  
has been active for less than 15 consecutive minutes. Any defrost signal present  
for longer than 15 minutes shall be considered invalid.  
Heat pump/fan coil and Hybrid Heat systems shall use this input to:  
S
Detect that defrost is in progress and energize the auxiliary heat to  
provide homeowner comfort during the defrost cycle  
S
Allow a defrost cycle to run to completion regardless of the system  
demand  
Three−Minute Minimum on Time  
In normal operation, when a stage turns on, it will not turn off for a minimum of  
3 minutes. In Hybrid Heat systems, the minimum on time for the furnace is 5  
minutes. If the setpoint is changed, this timer is canceled, allowing the equipment  
to turn off immediately when the demand is removed. The 3 minute minimum  
on timer applies to all stages of heating and cooling, except Hybrid Heat. A stage  
will run for a minimum of 3 minutes before the thermostat will be allowed to  
stage to a lower stage.  
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Heat/Cool Setpoints (Desired Temperature)  
A minimum difference of 1_ and maximum of 6_ is enforced between heating  
and cooling desired temperatures. This is done by allowing 1 setting to “push”  
the other, to maintain this difference. This difference is adjustable via  
Configuration Option 11.  
Equipment On Indicators  
When cooling equipment is on, a COOL ON icon is displayed. While cooling  
equipment operation is delayed by the time guard or cycle timer, COOL ON will  
flash. The same is true for HEAT ON icon.  
During second stage compressor operation a “2” will be displayed with the  
HEAT ON or COOL ON icon. This is displayed when the Thermidistat Control  
is configured as H2, A2, or h2.  
When the W is energized in a heat pump or Hybrid Heat system, the “auxiliary  
heat on” icon will be displayed.  
Humidify and Dehumidify Indicators  
When the Display Module door is closed, the humidify icon will be displayed  
when humidification is active and the dehumidify icon will be displayed when  
dehumidification is active.  
Auto Changeover  
When auto changeover mode is selected, a change from heat to cool (or vice  
versa) will not occur until an opposite mode demand has existed for 20 minutes.  
If setpoint is changed, 20−minute requirement is deleted.  
Emergency Heat Mode  
When Thermidistat Control is configured as a heat pump and emergency heat is  
selected, all Y signals are locked out, and W becomes energized upon a call for  
heat.  
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Programmable Fan (programmable models only)  
The fan output can be programmed based on period of the day. When  
programming for each day and period the fan can be set to On or AUTO. If the  
fan button is pressed to change from On to Auto or vice versa when  
programmable fan has been enabled, the manual change will only remain in  
effect until the next program period, when the programmable fan setting will be  
changed per the scheduled setting.  
Dry Contact  
On the programmable models, the dry contact that can be used for control of an  
auxiliary device. The dry contact may be configured to be closed for a specific  
number of minutes per hour for each period of the program schedule. This can  
be used to operate a ventilator, damper, system blower, or other auxiliary device.  
There are two terminals, D1 and D2.  
On both the programmable and non−programmable models, when configured as  
a dehumidify output, it will operate cooling equipment capable of dehumidify  
function. When configured for dehumidification, the Rc terminal must be  
connected to one of the dry contact terminals. The other dry contact terminal is  
connected to the dehumidify terminal on the furnace or fan coil. This provides  
power to energize the dehumidify terminal on the cooling equipment when the  
dry contact is closed.  
If it is desired to operate a ventilator or other device, the D1 and D2 terminals  
can be connected directly to the equipment. This will provide a closed contact  
for the specified number of minutes per hour. See Option 19.  
If timed control of the system blower is required, the dry contact can be used for  
this function. The G terminal can be connected to one of the dry contact  
terminals with the other terminal being connected to Rc and/or Rh for timed  
control of the fan. Note that this is not the same as programmable fan Option 30.  
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See Wiring Diagrams for more information.  
Relays  
This thermostat uses latching relays. When the thermostat loses power, the relays  
will remain in their last position until power is restored and all relays are reset to  
their correct position. Out of the box, the outputs may appear to be On when the  
thermostat is not powered. This is normal. Output states should only be checked  
when the thermostat is powered.  
Temperature Offset After Power Cycle  
To compensate for internal heat build−up from the electronics in the thermostat,  
the thermostat will add an offset to the actual temperature that it measures. If the  
thermostat power is cycled quickly, one can witness an immediate increase in the  
actual temperature displayed due to this added offset. The thermostat display will  
return to the actual room temperature after several minutes of operation.  
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TROUBLESHOOTING  
If the display module doesn’t power up after power is applied, check the Rc/Rh  
and C terminals for 24VAC. If 24VAC is present, check the voltage between Vg  
and V+. This voltage will be approximately 12−20VDC. If voltage is present,  
check the polarity to make sure it is wired correctly. The display will not power  
up if polarity is reversed.  
If dashes appear for Option 01 in config and during reboot, the problem could be  
the red pigtail being wired to Rc or Rh and the black pigtail being wired to C. If  
so, remove the two−wire pigtail and connect to the V+ and Vg terminals.  
Error Codes  
“−−” − If Thermidistat Control cannot properly read room temperature, display  
will indicate “−−” and all outputs (except fan, if on) will turn off. In the case  
where the installer has selected to average the local sensor and the remote room  
sensor, the Thermidistat Control display will alternate between “−−” for the  
failed sensor and the temperature sensed by the working sensor every 10  
seconds. The control will operate from the temperature sensed by the working  
sensor.  
E1 − If the Display Module and the Equipment Control Module cannot  
communicate via two−wire connection, an E1 will be displayed.  
E2 − There is no E2 error message.  
E3 − If Thermidistat Control cannot properly read outdoor temperature, and it is  
needed for proper operation, display will indicate “−−” in the outdoor  
temperaturelocation. If Option 06, 08, 09, 22, 23 or 44 is not set to OFF, display  
will indicate “−−” in the outdoor temperature location.  
E4 − If Thermidistat Control’s internal memory fails, E4 will be displayed.  
Replace Thermidistat Control.  
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E5 − If Thermidistat Control cannot properly read humidity, E5 will be  
displayed. Replace Thermidistat Control. If both Humidify and Dehumidify  
have been set to OF, the humidity value will be shown as “−−” when viewed  
from the humidity menu, but no E5 will be shown in the display.  
Table 4 can be used as a troubleshooting tool for determining which outputs will  
be active for a particular configuration and each operating mode.  
When replacing a failed component such as an equipment control module or a  
display module, the installer should replace both parts as a matched set. It is very  
easy to accidentally mix an A/C or HP display with a PRH equipment control  
module. When this happens, some functions appear in the setup while others do  
not. This can be very confusing to troubleshoot. Verify that both parts have the  
same model and serial number when troubleshooting the thermostat.  
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Table 4 – Equipment Configuration Outputs  
EQUIP  
CONFIG  
EM  
EM  
HARDWARE  
CONFIG  
COOL  
STG 1  
COOL  
STG 2  
HEAT  
HEAT  
HEAT  
HEAT  
HEAT  
STG 1  
HEAT  
STG 2  
STG 1  
STG 2  
STG 3  
STG 4  
OPTION 01  
SS AC  
SS AC  
AC  
Y/Y2  
Y/Y2  
-
-
W/W1  
W/W1  
-
-
-
-
-
-
-
W/W1  
O/W2/B  
(if  
HP  
RH  
-
-
Opt32+2)  
Y/Y2,  
SS HP  
Y/Y2,  
W/W1  
HP  
HP  
-
-
Y/Y2  
-
-
-
W/W1  
W/W1  
RVS + O  
O/W2/B  
W/W1  
Y1/W2  
Y/Y2,  
W/W1,  
O/W2/B  
Y/Y2  
SS HP  
Y/Y2,  
W/W1  
W/W1/  
Y1/W2  
Y/Y2  
RVS + B  
O/W2/B  
Y1/W2  
SS HP  
Y/Y2  
W/W1  
Y1/W2  
Y/Y2,  
Y/Y2,  
W/W1  
Y/Y2  
W/W1  
RVS + O  
RH  
RH  
-
-
Y/Y2  
W/W1  
W/W1  
O/W2/B  
Y1/W2  
Y1/W2  
Opt43 = On  
Y/Y2,  
Y1/W2,  
W/W1  
SS HP  
Y/Y2,  
W/W1,  
O/W2/B  
Y/Y2,  
Y1/W2,  
O/W2/B  
Y/Y2,  
W/W1  
RVS + B  
Y/Y2  
O/W2/B  
Y1/W2  
Opt43 = On  
O/W2/B  
Y/Y2,  
W/W1  
2SPD AC  
RH  
RH  
Y1/W2  
W/W1  
-
-
-
-
-
-
Y1W2  
O/W2/B  
Y1/W2  
Y/Y2  
Y1/W2  
Y/Y2  
2SPD HP  
Y1/W2  
Y1/W2  
Y/Y2  
Y1/W2  
W/W1  
RVS + O  
O/W2/B  
O/W2/B  
W/W1  
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Table 4 − Equipment Configuration Outputs (cont.)  
EQUIP  
CONFIG  
EM  
EM  
HARDWARE  
CONFIG  
COOL  
STG 1  
COOL  
STG 2  
HEAT  
HEAT  
HEAT  
HEAT  
HEAT  
STG 1  
HEAT  
STG 2  
STG 1  
STG 2  
STG 3  
STG 4  
OPTION 01  
Y1/W2  
Y/Y2  
Y1/W2  
Y/Y2  
2SPD HP  
Y1/W2  
Y/Y2  
Y1/W2  
RH  
Y1/W2  
-
W/W1  
-
O/W2/B  
W/1  
RVS + B  
O/W2/B  
O/W2/B  
SS Hybrid  
Heat  
Y/Y2,  
W/W1  
W/W1  
RH  
RH  
RH  
RH  
-
-
Y/Y2  
W/W1  
W/W1  
-
-
-
-
W/W1  
W/W1  
W/W1  
W/W1  
O/W2/B  
Y1/W2  
Y1/W2  
RVS + O  
SS Hybrid  
Heat  
Y/Y2  
Y/Y2  
-
-
-
-
O/W2/B  
RVS + B  
2S Hybrid  
Heat  
Y1/W2  
Y/Y2  
Y1/W2  
Y1/W2  
Y/Y2  
Y1/W2  
W/W1  
W/W1  
O/W2/B  
RVS + O  
O/W2/B  
2S Hybrid  
Heat  
Y1/W2  
Y/Y2  
Y1/W2  
Y/Y2  
Y1/W2  
Y1/W2  
O/W2/B  
RVS + B  
O/W2/B  
If HP or  
2S board  
AND  
AC  
HP  
RH  
Heat Only  
Unit  
-
-
W/W1  
-
-
-
-
Opt32 + 2  
Cool Only  
Unit  
Y1/W2  
Y/Y2  
RH  
Y1/W2  
Y/Y2  
-
-
-
-
-
-
-
-
-
-
-
Cool Only  
Unit  
AC  
HP  
-
-
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WIRING DIAGRAMS  
Display module  
wall mount  
Display module  
Equipment Control Module  
Fan Coil  
Heat Pump  
V+  
Vg  
V+  
Vg  
V+  
Vg  
V+  
Vg  
O
W3  
W2  
Y
O
RVS/Heat Stage 2  
Heat Stage 1  
O/B W2  
W/W1  
Y/Y2  
Y1 / W2  
G
W2  
Compressor  
Y
R
Fan  
G
R
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
Rc  
D1  
Dry Contact 2  
D2  
24VAC Common  
C
C
C
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
OAT  
RRS  
Outdoor Sensor *  
SRTN  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09163  
Fig. 18 − Display to Equipment Control Module Connection  
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Fan Coil  
Heat Pump  
Equipment Control Module  
O
W1  
W2  
Y1  
O
RVS Cooling  
Heat Stage 3  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W1  
Remove J2  
jumper for  
heat staging  
Heat/Cool Stage 1  
Heat/Cool Stage 2  
Fan  
Y1  
Y/Y2  
G
Y/Y2  
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
R
R
Rc  
Remove J1  
jumper for  
Dehumidify  
modes  
D1  
Dry Contact 2  
D2  
DH  
C
24VAC Common  
Humidify  
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09164  
Fig. 19 − FV/FK Fan Coil with 2−Stage Heat Pump  
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Typical  
Fan Coil  
Single-Stage  
Heat Pump  
Equipment Control Module  
O
RVS Cooling  
Heat Stage 2  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
E
W2  
W2  
W3  
Heat Stage 3  
Heat/Cool Stage 1  
Fan  
Y
R
G
R
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
Rc  
D1  
Dry Contact 2  
D2  
24VAC Common  
Humidify  
C
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09165  
Fig. 20 − Typical Fan Coil with Heat Pump  
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Equipment Control Module  
RVS/Heat Stage 2  
Heat Stage 1  
O/B W2  
W3  
W2  
W/W1  
Y1 / W2  
Y/Y2  
G
Compressor Low  
Compressor High  
Fan  
G
R
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
Rc  
D1  
Dry Contact 2  
D2  
Aux. Connection  
24VAC Common  
Humidify  
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09166  
Fig. 21 − Fan Coil Shown w/Aux. Connection #1  
(Heat Pump/Air Conditioner removed for clarity.)  
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Equipment Control Module  
Fan Coil  
Air Conditioner  
O
W2  
W1  
Y1  
Remove J2  
Jumper for  
heat staging  
Heat Stage 2  
Heat Stage 1  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
Cool Stage 1  
Y1  
Y2  
Cool Stage 2  
Y/Y2  
G
Fan  
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Dry Contact 2  
24VAC Common  
Humidify  
Rh  
R
R
Rc  
Remove J1  
jumper for  
Dehumidify  
modes  
D1  
D2  
DH  
C
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09167  
Fig. 22 − FV/FK Fan Coil w/2−Stage Air Conditioner  
68  
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Typical  
Fan Coil  
Single-Stage  
Air Conditioner  
Equipment Control Module  
O
E
Heat Stage 2  
Heat Stage 1  
N/A  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W3  
W2  
Y
Cool Stage 1  
Fan  
Y
R
G
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Dry Contact 2  
24VAC Common  
Humidify  
Rh  
R
Rc  
D1  
D2  
C*  
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09168  
Fig. 23 − Typical Fan Coil with Air Conditioner  
69  
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Fan Coil  
Equipment Control Module  
RVS/Heat Stage 2  
Heat Stage 1  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W3  
W2  
Compressor Low  
Compressor High  
Fan  
G
R
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
Rc  
D1  
Dry Contact 2  
D2  
Aux. Connection  
24VAC Common  
Humidify  
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09169  
Fig. 24 − Fan Coil Shown with Aux. Connection #2  
(Heat Pump/Air Conditioner removed for clarity.)  
70  
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Equipment Control Module  
Fan Coil  
O
Heat Pump  
O
RVS Cooling  
Heat Stage 2  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W2  
Remove J2  
Jumper for  
heat staging  
W1  
W2  
Y/Y2  
G
Heat Stage 3  
Heat/Cool Stage 1  
Fan  
Y
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
R
R
Rc  
Y1  
Remove J1  
Jumper for  
Dehumidify  
modes  
D1  
Dry Contact 2  
D2  
DH  
C
24VAC Common  
Humidify  
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09170  
Fig. 25 − FV/FK Fan Coil with 1−Stage Heat Pump  
71  
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Typical  
Fan Coil  
Equipment Control Module  
RVS/Heat Stage 2  
Heat Stage 1  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
E
W2  
Compressor Low  
Compressor High  
Fan  
G
R
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
Rc  
D1  
Dry Contact 2  
D2  
24VAC Common  
Humidify  
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09171  
Fig. 26 − Typical Fan Coil Heating Only  
72  
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Equipment Control Module  
RVS/Heat Stage 2  
Heat Stage 1  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
Compressor Low  
Compressor High  
Fan  
G
R
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
Rc  
D1  
Dry Contact 2  
D2  
24VAC Common  
Humidify  
C
C
HUM  
OAT  
RRS  
SRTN  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
A09172  
Fig. 27 − Thermidistat Control w/Dry Contact Control for Fan Run Time  
73  
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Equipment Control Module  
Fan Coil  
Air Conditioner  
O
W2  
W1  
Y1  
Remove J2  
Jumper for  
heat staging  
Heat Stage 2  
Heat Stage 1  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
N/A  
Heat/Cool Stage 1  
Fan  
Y/Y2  
G
Y
R
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Dry Contact 2  
24VAC Common  
Humidify  
Rh  
R
Remove J1  
Jumper for  
Dehumidify  
modes  
Rc  
D1  
D2  
DH  
C
C*  
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09173  
Fig. 28 − FV/FK Fan Coil with 1−Stage Air Conditioner  
74  
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Typical  
Fan Coil  
Single-Stage  
Air Conditioner  
Equipment Control Module  
RVS/Heat Stage 2  
Heat Stage 1  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
Compressor Low  
Compressor High  
Fan  
Y
R
G
R
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Rh  
Rc  
D1  
Dry Contact 2  
D2  
C*  
24VAC Common  
Humidify  
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09161  
Fig. 29 − Typical Fan Coil Cooling Only  
75  
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Equipment Control Module  
Furnace  
Heat Pump  
O
RVS Cooling  
Heat Stage 3 (furnace)  
Heat/Cool Stage 1  
Heat/Cool Stage 2  
Fan  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W2  
W/W1  
Y1  
W2**  
Y1  
Y/Y2  
G
Y/Y2  
24VAC Hot Heating  
24VAC Hot Cooling  
***Dry Contact 1  
Dry Contact 2  
Rh  
R
R
C
Rc  
D1  
DHUM  
COM  
D2  
24VAC Common  
Humidify  
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
** Some heat pumps may designate W1.  
***Option 19 set to 2.  
A09121  
Fig. 30 − Variable Speed, Multi−Stage, Stage Modulating and Single−Stage  
Furnace with 2−Stage Heat Pump  
76  
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Single-Stage  
Heat Pump  
Furnace  
Equipment Control Module  
O
W2**  
Y
Y1  
W
RVS Cooling  
Heat Stage 2 (furnace)  
Heat Stage 2  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
Y/Y2  
G
Heat/Cool Stage 1  
Fan  
24VAC Hot Heating  
24VAC Hot Cooling  
Rh  
R
R
Rc  
HUM  
***  
Dry Contact 1  
Dry Contact 2  
D1  
D2  
DHUM  
COM  
24VAC Common  
Humidify  
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
** Some heat pumps may designate W1.  
***Option 19 set to 2.  
A09122  
Fig. 31 − Single−StageFurnace with Heat Pump  
(Hybrid Heat)  
77  
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Furnace  
Air Conditioner  
Equipment Control Module  
Heat Stage 2  
Heat Stage 1  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W2  
W/W1  
Y1  
Cool Stage 1  
Y1  
Cool Stage 2  
Y/Y2  
G
Y/Y2  
Fan  
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Dry Contact 2  
24VAC Common  
Humidify  
Rh  
R
R
C
Rc  
D1  
D2  
DHUM  
COM  
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09123  
Fig. 32 − Variable Speed, Step Modulating, Multi−Stage and Single−Stage  
Furnace with Two−Stage Air Conditioner  
78  
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Single-Stage  
Air Conditioner  
Equipment Control Module  
Furnace  
Y1  
W
N/A  
Heat Stage 1  
N/A  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
Y/Y2  
G
Cool Stage 1  
Fan  
Y
R
24VAC Hot Heating  
24VAC Hot Cooling  
Rh  
R
Rc  
**  
Dry Contact 1  
Dry Contact 2  
D1  
D2  
DHUM  
COM  
C*  
24VAC Common  
Humidify  
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
** Option 19 set to 2.  
A09124  
Fig. 33 − Single−StageFurnace with Single−Speed Air Conditioner  
79  
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Furnace  
Heat Pump  
Equipment Control Module  
RVS Cooling  
O
O/B W2  
Y1 / W2  
W/W1  
Y/Y2  
G
W2  
W/W1  
Y1  
W2**  
(furnace)  
(furnace)  
Heat Stage 3  
Heat Stage 2  
Heat/Cool Stage 1  
Fan  
Y/Y2  
G
Y
R
24VAC Hot Heating  
24VAC Hot Cooling  
Rh  
R
Rc  
***  
Dry Contact 1  
Dry Contact 2  
D1  
D2  
DHUM  
COM  
24VAC Common  
Humidify  
C
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
** Some heat pumps may designate W1.  
***Option 19 set to 2.  
A09125  
Fig. 34 − Variable Speed, Multi−Stage and Step Modulating Furnace with  
Single−Stage Heat Pump  
80  
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Equipment Control Module  
Furnace  
N/A  
Heat Stage 1  
N/A  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W
N/A  
Fan  
G
R
24VAC Hot Heating  
24VAC Hot Cooling  
Dry Contact 1  
Dry Contact 2  
24VAC Common  
Humidify  
Rh  
Rc  
D1  
DHUM  
COM  
D2  
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
A09126  
Fig. 35 − Single−StageFurnace Heating Only  
81  
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Equipment Control Module  
Furnace  
Air Conditioner  
Heat Stage 2  
Heat Stage 1  
N/A  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W2  
W/W1  
Y1  
Cool Stage 1  
Fan  
Y/Y2  
G
Y
R
24VAC Hot Heating  
24VAC Hot Cooling  
Rh  
R
Rc  
**  
Dry Contact 1  
Dry Contact 2  
D1  
D2  
DHUM  
COM  
C*  
24VAC Common  
Humidify  
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
** Option 19 set to 2.  
A09127  
Fig. 36 − Variable Speed, Multi−Stage, Step Modulating and Single−Stage  
Furnace with Single−Stage Air Conditioner  
82  
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Equipment Control Module  
Furnace  
Air Conditioner  
Heat Stage 2  
Heat Stage 1  
N/A  
O/B W2  
W/W1  
Y1 / W2  
Y/Y2  
G
W1  
Y1  
Cool Stage 1  
Fan  
Y/Y2  
G
Y
R
C
24VAC Hot Heating  
24VAC Hot Cooling  
Rh  
R
Rc  
**  
Dry Contact 1  
Dry Contact 2  
D1  
DHUM  
COM  
D2  
24VAC Common  
Humidify  
C
HUM  
OAT  
RRS  
SRTN  
Humidifier Solenoid  
Valve *  
Outdoor Air Temp  
Remote Room Sensor  
OAT/RRS Com  
Outdoor Sensor *  
Remote Room  
Sensor *  
*
Indicates connection may not be required/available.  
** Option 19 set to 2.  
A09152  
Fig. 37 − Single−stageFurnace with Air Conditioner and Split Power  
83  
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THERMIDISTAT CONTROL CONFIGURATION  
RECORD  
Installer  
_________________________  
Model Number  
______________________________  
Date  
_________________________  
A. Hardware Configuration  
__________  
B. Mode Settings  
__________  
Seal Hole In Wall  
Mode (Off, Heat, Cool, Auto, Em Heat)  
__________  
Heating Setpoint Value  
Cooling Setpoint Value  
Fan (Auto or On)  
__________  
__________  
C. Home, Away, Sleep Settings  
Heat Cool  
Home  
____ ____  
Away  
____ ____  
Sleep  
____ ____  
D. Schedule (For Programmable Thermidistat Controls)  
Period 1  
Period 2  
Period 3  
Period 4  
Time Heat Cool Time Heat Cool Time Heat Cool Time Heat Cool  
____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____  
____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____  
____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____  
All Days  
Weekdays  
Weekend  
84  
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E Configuration Options  
Equipment Type  
Option 01  
Option 02  
Option 03*  
Option 04  
Option 05  
Option 06  
Option 07  
Option 08  
Option 09  
Option 10  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
Clean Filter Timer Adjustment  
Fahrenheit/Centigrade Selection  
Fan (G) on with W/W1 Selection  
Room Air Temperature Sensing (programmable models only)  
Cooling Lockout Below 55_ F/13_ C Selection (only available if outdoor air sensor is present)  
Zoning  
Auxiliary Heat Lockout Temperature Setting (only available when heat pump is used and when outdoor air  
_____ temperature sensor is present)  
Heat Pump Lockout Temperature  
_____  
Reversing Valve  
_____  
Option 11  
Option 12  
Option 13  
Adjustable Setpoint Deadband (not available on Heat Only and Cool Only systems)  
_____  
_____ Smart Recovery (programmable models only)  
Room Air Temperature Offset Adjustment  
_____  
Option 14  
Option 15  
Option 16  
Option 17  
Option 18*  
Humidity Offset Adjustment  
_____  
Enable Auto Mode  
_____  
Cycles Per Hour  
_____  
Time Between Stages  
_____  
Backlight Configuration  
_____  
85  
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E Configuration Options (cont)  
Dry Contact (programmable models only)  
Option 19  
Option 20  
Option 21*  
Option 22  
Option 23  
Option 24*  
Option 25*  
Option 26  
Option 27  
Option 28  
Option 29  
Option 30*  
Option 31*  
Option 32  
Option 33  
Option 34  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
_____  
Outdoor Air Temperature Offset Adjustment  
Keypad Lockout  
High Cool Latch Temperature  
High Heat Latch Temperature  
Programmable/Non-Programmable (programmable models only)  
Number of Programmable Periods Per Day (programmable models only)  
Minimum Cooling Setpoint  
Maximum Heating Setpoint  
UV Light Reminder  
Humidifier Pad Reminder  
Programmable Fan (programmable models only)  
Daylight Savings Time Configuration (programmable models only)  
Furnace Heat Staging  
Single or Two-Piece Installation  
Hybrid Heat Furnace Latch  
86  
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E Configuration Options (cont)  
Option 40  
Option 41  
Option 42  
Option 43  
Option 44  
Option 99  
Fan Humidity  
_____  
_____  
_____  
_____  
_____  
_____  
Variable Speed Blower  
Variable Speed Super Dehumidification  
Intelligent Heat Staging  
Super Comfort Heat  
Reset to Factory Defaults  
* Options with an asterisk can also be set/changed by the homeowner.  
87  
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TP-PRH-4SI  
Copyright 2009 Carrier Corp.  
Printed in U.S.A.  
S
7310 W. Morris St.  
S
Edition Date: 04/09  
Indianapolis, IN 46231  
Catalog No: TP-PRH-4SI  
Manufacturer reserves the right to change, at any time, specifications  
and designs without notice and without obligations.  
Replaces: TP-PRH-3SI  
88  
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