Carrier TP-NRH-A, TP-PRH-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.

TABLE OF CONTENTS

PAGE

SAFETY CONSIDERATIONS 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INTRODUCTION 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTALLATION CONSIDERATIONS 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTALLATION 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SYSTEM START−UP AND CHECKOUT 44. . . . . . . . . . . . . . . . . . . . . . . . . .

OPERATIONAL INFORMATION 55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TROUBLESHOOTING 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

WIRING DIAGRAMS 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

THERMIDISTAT CONTROL CONFIGURATION RECORD 84. . . . . . . . . . .

SAFETY CONSIDERATIONS

Read and follow manufacturer instructions carefully. Follow all local electrical
codes during installation. All wiring must conform to local and national electrical
codes. Improper wiring or installation may damage Thermidistat Control.

Recognize safety information. This is the safety−alert symbol . When you see
this symbol on the equipment and in the instruction manual, be alert to the
potential for personal injury.

Understand the signal words DANGER, WARNING, and CAUTION. These
words are used with the safety−alert symbol. DANGER identifies the most
serious hazards which will result in severe personal injury or death. WARNING
signifies a hazard which could result in personal injury or death. CAUTION is
used to identify unsafe practices which may result in minor personal injury or
product and property damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability, or operation.

2

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 Edge 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
temperature and humidity control.

The non−programmable Thermidistat Control features Touch ’N’ Go 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.

3

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.

4

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
Heat 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.

5

!

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
temperature sensor 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.

6

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.

7

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−A Carton Contents

1. Display Module

2. Stand−off for Equipment Control Module

3. Outside Air Temperature Sensor, screws and pigtail

4. Equipment Control Module

8

Fig. 3 − TP−NRH−A Carton 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:

 Approximately 5 ft (1.5m) from floor.
 Close to or in a frequently used room, preferably on an inside

partitioning wall.

 On a section of wall without pipes or duct work.

Thermidistat Control should NOT be mounted:

 Close to a window, on an outside wall, or next to a door leading to the

outside.

9

A07686

 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.

10

!

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.

11

!

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.

12

Fig. 4 − Press Tabs to Remove Backplate

Fig. 5 − Take Apart

13

A07225

A07226

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.

14

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.

Fig. 7 − Control Module Wiring Guide

 Red is V+

 Black is Vg

A08072

15

Fig. 8 − Secure Wires to Terminal Strip

Fig. 9 − Connect Pigtail Wires to Display Module

16

A07166

A07167

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.

 Red of the pigtail is V+

 Black of the pigtail is Vg

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
temperature and/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

17

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
clearance hole or supplied standoff. See Fig. 12.

18

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.

19

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

20

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.

21

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.

22

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

23

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

24

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)

25

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

26

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.

27

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 3

Sensor 2

Sensor 4

Fig. 16 − Remote Room Sensor − Parallel Wiring

28

A09130

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

29

temperature falls 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.

30

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
deliberately miscalibrate 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

31

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.

32

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

33

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.

34

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.

36

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−programmable operation.

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

37

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.

38

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

39

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.

40

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.

41

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.

44

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−programmable models, 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

45

non−programmable models, 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 Star 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 HEAT COOL

Wake 6:00 AM

Day 8:00 AM

Evening 5:00 PM

Sleep 10:00 PM

68F/20C 78F/26C

60F/16C 85F/29C

68F/20C 78F/26C

60F/16C 82F/28C

46

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.

47

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

SELECTION FAN DISPLAY

Normal Humidify Blank 10-44

Auto Humidify AUTO 1

Humidify Off 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.

HUMIDIFY SETPOINT

DISPLAY

48

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.

49

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

50

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.

Fig. 17 − Auto Humidity

3. Dehumidify Off
Dehumidification can be turned off completely. This can be done without
changing existing setpoints.

A06599

51

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.

52

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 AUTO

Fan Auto

Heat Setpoint 55F/13C

Cool Setpoint 85F/29C

Humidify Setpoint 20F/−7C

Dehumidify Setpoint 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

54

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−Minute Compressor 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−Minute Staging 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.

55

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:

 Detect that defrost is in progress and energize the auxiliary heat to

provide homeowner comfort during the defrost cycle

 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.

56

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.

57

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.

58

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.

59

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
temperature location. 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.

60

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.

61

Table 4 – Equipment Configuration Outputs

EQUIP

CONFIG

OPTION 01

SS AC AC Y/Y2 - W/W1 - - - - -

SS AC

SS HP

RVS + O

SS HP

RVS + B

SS HP

RVS + O

Opt43 = On

SS HP

RVS + B

Opt43 = On

2SPD AC RH Y1/W2

2SPD HP

RVS + O

HARDWARE

CONFIG

COOL
STG 1

HP
RH

HP

HP Y/Y2 -

RH

RH Y/Y2 -

RH

Y/Y2 - W/W1

Y/Y2,

O/W2/B

Y/Y2,

O/W2/B

Y1/W2

O/W2/B

COOL
STG 2

- Y/Y2

- Y/Y2

Y/Y2,
Y1W2

Y1/W2

Y/Y2

O/W2/B

HEAT

STG 1

Y/Y2,

O/W2/B

Y/Y2,

O/W2/B

W/W1

Y1/W2

HEAT

STG 2

W/W1

O/W2/B

(if

Opt32+2)

Y/Y2,
W/W1

Y/Y2,

W/W1,

O/W2/B

Y/Y2,
W/W1

Y/Y2,

W/W1,

O/W2/B

W/W1

O/W2/B

Y1/W2

Y/Y2

HEAT

STG 3

- - - -

- - W/W1

Y/Y2
W/W1/
Y1/W2

Y/Y2
Y1/W2

Y/Y2,

Y1/W2,

O/W2/B

O/W2/B

- - - -

Y1/W2

Y/Y2

W/W1

EM

HEAT

HEAT

STG 4

STG 1

- W/W1

Y/Y2

W/W1

W/W1

Y1/W2

Y/Y2,

Y1/W2,

W/W1

W/W1

- W/W1 -

EM

HEAT

STG 2

W/W1

Y1/W2

W/W1

Y1/W2

W/W1

Y1/W2

W/W1

Y1/W2

62

EQUIP

CONFIG

OPTION 01

2SPD HP

RVS + B

SS Hybrid

Heat

RVS + O

SS Hybrid

Heat

RVS + B

2S Hybrid

Heat

RVS + O

2S Hybrid

Heat

RVS + B

Heat Only

Unit

Cool Only

Unit

Cool Only

Unit

Table 4 − Equipment Configuration Outputs (cont.)

HARDWARE

CONFIG

COOL

COOL

STG 1

STG 2

RH Y1/W2

RH

RH Y/Y2 -

RH

RH Y1/W2

AC
HP
RH

RH Y1/W2

AC
HP

Y1/W2

Y/Y2,

O/W2/B

Y1/W2

Y1/W2

O/W2/B

O/W2/B

Y1/W2

- - W/W1

Y1/W2

Y/Y2 - - - - - - -

HEAT

STG 1

Y1/W2

Y/Y2

O/W2/B

- Y/Y2 W/W1

Y/Y2

O/W2/B

Y/Y2

Y1/W2

Y1/W2

Y/Y2

O/W2/B

2S board

Opt32 + 2

Y/Y2

- - - - - -

HEAT

HEAT

STG 2

Y1/W2

Y/Y2

O/W2/B

W/W1 - - W/W1 -

Y1/W2

Y/Y2

Y1/W2

Y/Y2

O/W2/B

If HP or

AND

HEAT

STG 3

STG 4

Y1/W2

Y/Y2

O/W2/B

W/1

W/W1

Y1/W2

W/W1 - W/W1 -

W/W1 - W/W1 -

- - - -

EM

HEAT

HEAT

STG 1

STG 2

- W/W1 -

- W/W1

W/W1

Y1/W2

EM

63

WIRING DIAGRAMS

Outdoor Sensor *

Remote Room

Sensor *

Display module

V+

Vg

Fig. 18 − Display to Equipment Control Module Connection

Display module
wall mount

V+ V+

Vg Vg O O

V+ RVS/Heat Stage 2 O/B W2 W3 W2

Vg Heat Stage 1 W/W1 W2

* Indicates connection may not be required/available.

Equipment Control Module

Compressor Y/Y2 Y Y

Y1 / W2

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2

24VAC Common C C C

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

Fan Coil Heat Pump

A09163

64

Equipment Control Module

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

RVS Cooling O/B W2 W1 W1

Heat Stage 3 W/W1 W2

Heat/Cool Stage 1 Y1 / W2 Y1 Y1

Heat/Cool Stage 2 Y/Y2 Y/Y2 Y/Y2

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc Remove J1

Dry Contact 1 D1

Dry Contact 2 D2 DH

24VAC Common C C C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.

Fan Coil Heat Pump

OO

jumper for
Dehumidify
modes

Fig. 19 − FV/FK Fan Coil with 2−Stage Heat Pump

Remove J2
jumper for
heat staging

A09164

65

Equipment Control Module Fan Coil Heat Pump

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

RVS Cooling O/B W2 E W2

Heat Stage 2 W/W1 W2

Heat Stage 3 Y1 / W2 W 3

Heat/Cool Stage 1 Y/Y2 Y

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2

24VAC Common C C C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.

Typical Single-Stage

O

A09165

Fig. 20 − Typical Fan Coil with Heat Pump

66

Equipment Control Module

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

RVS/Heat Stage 2 O/B W2 W3

Heat Stage 1 W/W 1 W2

Compressor Low Y1 / W2

Compressor High Y/Y2

Fan G G

24VAC Hot Heating Rh R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2 Aux. Connection

24VAC Common C C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.

Fig. 21 − Fan Coil Shown w/Aux. Connection #1

(Heat Pump/Air Conditioner removed for clarity.)

A09166

67

Equipment Control Module Fan Coil Air Conditioner

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc Remove J1

Dry Contact 1 D1

Dry Contact 2 D2 DH

24VAC Common C C C

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

O

Heat Stage 2 O/B W 2 W2

Heat Stage 1 W/W1 W1

Cool Stage 1 Y1 / W 2 Y1 Y1

Cool Stage 2 Y/Y2 Y/Y2 Y2

Fan G G

Humidify HUM

* Indicates connection may not be required/available.

Remove J2
Jumper for
heat staging

jumper for
Dehumidify
modes

Fig. 22 − FV/FK Fan Coil w/2−Stage Air Conditioner

68

A09167

Typical Single-Stage

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

Equipment Control Module

Heat Stage 2 O/B W 2 E

Heat Stage 1 W/W1 W3

N/A Y1 / W2 W2

Cool Stage 1 Y/Y2 Y Y

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2

24VAC Common C C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.

Fan Coil Air Conditioner

O

Fig. 23 − Typical Fan Coil with Air Conditioner

C*

A09168

69

Equipment Control Module

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

RVS/Heat Stage 2 O/B W2 W3

Heat Stage 1 W/W 1 W2

Compressor Low Y1 / W2

Compressor High Y/Y2

Fan G G

24VAC Hot Heating Rh R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2 Aux. Connection

24VAC Common C C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.

Fan Coil

Fig. 24 − Fan Coil Shown with Aux. Connection #2

(Heat Pump/Air Conditioner removed for clarity.)

A09169

70

Equipment Control Module Fan Coil Heat Pump

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

OO

RVS Cooling O/B W2 W2

Heat Stage 2 W/W1 W1

Heat Stage 3 Y1 / W2 W 2

Heat/Cool Stage 1 Y/Y2 Y/Y2 Y

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc Y1 Remove J1

Dry Contact 1 D1

Dry Contact 2 D2 DH

24VAC Common C C C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.

Remove J2
Jumper for
heat staging

Jumper for
Dehumidify
modes

A09170

Fig. 25 − FV/FK Fan Coil with 1−Stage Heat Pump

71

Equipment Control Module

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

RVS/Heat Stage 2 O/B W 2 E

Heat Stage 1 W /W1 W 2

Compressor Low Y1 / W2

Compressor High Y/Y2

Fan G G

24VAC Hot Heating Rh R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2

24VAC Common C C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.

Fig. 26 − Typical Fan Coil Heating Only

Typical

Fan Coil

A09171

72

Equipment Control Module

RVS/Heat Stage 2 O/B W2

Heat Stage 1 W/W 1

Compressor Low Y1 / W2

Compressor High Y/Y2

Fan G G

24VAC Hot Heating Rh R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2

24VAC Common C C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

A09172

Fig. 27 − Thermidistat Control w/Dry Contact Control for Fan Run Time

73

Equipment Control Module Fan Coil Air Conditioner

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

Heat/Cool Stage 1 Y/Y2 Y/Y2 Y

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2 DH

24VAC Common C C

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

O

Heat Stage 2 O/B W 2 W 2

Heat Stage 1 W/W1 W1

N/A Y1 / W2 Y1

Fan G G

Humidify HUM

* Indicates connection may not be required/available.

Fig. 28 − FV/FK Fan Coil with 1−Stage Air Conditioner

74

Remove J2
Jumper for
heat staging

Remove J1
Jumper for
Dehumidify
modes

C*

A09173

Equipment Control Module

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

RVS/Heat Stage 2 O/B W2

Heat Stage 1 W/W1

Compressor Low Y1 / W2

Compressor High Y/Y2 Y

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2

24VAC Common C C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.

Typical Single-Stage

Fan Coil Air Conditioner

Fig. 29 − Typical Fan Coil Cooling Only

C*

A09161

75

Equipment Control Module Furnace Heat Pump

Heat Stage 3

(furnace)

W/W1 W/W1 W2**

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

O

RVS Cooling O/B W 2 W2

Fig. 30 − Variable Speed, Multi−Stage, Stage Modulating and Single−Stage

Heat/Cool Stage 1 Y1 / W2 Y1

Heat/Cool Stage 2 Y/Y2 Y/Y2 Y/Y2

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

Dry Contact 1 D1

***

Dry Contact 2 D2

24VAC Common C COM C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.
** Some heat pumps may designate W1.
***Option 19 set to 2.

Y1

DHUM

Furnace with 2−Stage Heat Pump

76

A09121

Equipment Control Module

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

Furnace Heat Pump

Single-Stage

RVS Cooling O/B W 2

Heat Stage 2

Heat/Cool Stage 1 Y/Y2

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

***

24VAC Common C COM C

Outdoor Air Temp OAT

Remote Room Sensor RRS

(furnace)

Heat Stage 2

Fan G G

Dry Contact 1 D1

Dry Contact 2 D2 DHUM

Humidify HUM

OAT/RRS Com SRTN

* Indicates connection may not be required/available.
** Some heat pumps may designate W1.
***Option 19 set to 2.

W/W1 W

Y1 / W2

Y1

Y/Y2

HUM

Fig. 31 − Single−Stage Furnace with Heat Pump

(Hybrid Heat)

77

O

W2**

Y

A09122

Equipment Control Module

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

Heat Stage 2 O/B W 2 W 2

Heat Stage 1 W/W1

Cool Stage 1 Y1 / W 2 Y1

Cool Stage 2 Y/Y2 Y/Y2 Y/Y2

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2 DHUM

24VAC Common C COM C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.

Furnace Air Conditioner

W/W1

Y1

A09123

Fig. 32 − Variable Speed, Step Modulating, Multi−Stage and Single−Stage

Furnace with Two−Stage Air Conditioner

78

Equipment Control Module Furnace Air Conditioner

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

Single-Stage

Remote Room Sensor RRS

N/A O/B W2

Heat Stage 1 W/W1 W

N/A Y1 / W2

Cool Stage 1 Y/Y2

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

**

Dry Contact 1 D1

Dry Contact 2 D2 DHUM

24VAC Common C COM

Humidify HUM

Outdoor Air Temp OAT

OAT/RRS Com SRTN

* Indicates connection may not be required/available.
** Option 19 set to 2.

Y1

Y/Y2

Y

C*

Fig. 33 − Single−Stage Furnace with Single−Speed Air Conditioner

79

A09124

Equipment Control Module

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

RVS Cooling O/B W2 W2

Heat Stage 3

Heat Stage 2

Heat/Cool Stage 1 Y/Y2 Y/Y2 Y

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

***

24VAC Common C

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

(furnace)

(furnace)

Fan G G

Dry Contact 1 D1

Dry Contact 2 D2 DHUM

Humidify HUM

* Indicates connection may not be required/available.
** Some heat pumps may designate W1.
***Option 19 set to 2.

Y1 / W2 W/W1

W/W1 Y1

Furnace Heat Pump

O

W2**

COM

C

A09125

Fig. 34 − Variable Speed, Multi−Stage and Step Modulating Furnace with

Single−Stage Heat Pump

80

Equipment Control Module Furnace

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

N/A O/B W2

Heat Stage 1 W/W1 W

N/A Y1 / W2

N/A Y/Y2

Fan G G

24VAC Hot Heating Rh R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2

24VAC Common C COM

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.

Fig. 35 − Single−Stage Furnace Heating Only

DHUM

A09126

81

Equipment Control Module Furnace Air Conditioner

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

Heat Stage 2 O/B W2 W2

Heat Stage 1 W/W1

N/A Y1 / W2 Y1

Cool Stage 1 Y/Y2 Y/Y2 Y

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

**

Dry Contact 1 D1

Dry Contact 2 D2 DHUM

24VAC Common C COM

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.
** Option 19 set to 2.

W/W1

C*

A09127

Fig. 36 − Variable Speed, Multi−Stage, Step Modulating and Single−Stage

Furnace with Single−Stage Air Conditioner

82

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

Equipment Control Module

Heat Stage 2 O/B W 2

Heat Stage 1 W /W1 W1

N/A Y1 / W2 Y1

Cool Stage 1 Y/Y2 Y/Y2 Y

Fan G G

24VAC Hot Heating Rh R

24VAC Hot Cooling Rc R

**

Dry Contact 1 D1

Dry Contact 2 D2

24VAC Common C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

* Indicates connection may not be required/available.
** Option 19 set to 2.

Furnace Air Conditioner

DHUM

COM

C

Fig. 37 − Single−stage Furnace with Air Conditioner and Split Power

A09152

83

THERMIDISTAT CONTROL CONFIGURATION

RECORD

Installer
_________________________

A. Hardware Configuration

__________ Seal Hole In Wall

B. Mode Settings

__________ 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)

All Days

Weekdays

Weekend

____ ____

____ ____

____ ____

Period 1 Period 2 Period 3 Period 4

Time Heat Cool Time Heat Cool Time Heat Cool Time Heat Cool

____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____

____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____

____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____

Model Number
______________________________

Date
_________________________

84

E Configuration Options

Option 01

Option 02

Option 03*

Option 04

Option 05

Option 06

Option 07

Option 08

Option 09

Option 10

Option 11

Option 12 _____ Smart Recovery (programmable models only)

Option 13

Option 14

Option 15

Option 16

Option 17

Option 18*

Equipment Type

_____

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

_____

Adjustable Setpoint Deadband (not available on Heat Only and Cool Only systems)

_____

Room Air Temperature Offset Adjustment

_____

Humidity Offset Adjustment

_____

Enable Auto Mode

_____

Cycles Per Hour

_____

Time Between Stages

_____

Backlight Configuration

_____

85

E Configuration Options (cont)

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

Dry Contact (programmable models only)

_____

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

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

TP-PRH-4SI

Copyright 2009 Carrier Corp.  7310 W. Morris St.  Indianapolis, IN 46231
Printed in U.S.A. Edition Date: 04/09

Manufacturer reserves the right to change, at any time, specifications
and designs without notice and without obligations. Replaces: TP-PRH-3SI

Catalog No: TP-PRH-4SI

88