Carrier Thermostat Thermostat User Manual

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Programmable Thermostats

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Installation, Start-Up, and Operating Instructions

NOTE: Read the entire instruction manual before starting the

installation.

As an ENERGY STAR Partner, Carrier Corporation has

determined that this product meets the ENERGY STAR

This symbol → indicates a change since the last issue.

guidelines for energy efficiency.

INDEX

Page

SAFETY CONSIDERATIONS.....................................................1

INTRODUCTION..........................................................................1

INSTALLATION CONSIDERATIONS.......................................1

INSTALLATION......................................................................2-12

Location.....................................................................................2

Set DIP Switches ......................................................................2

Install Thermostat..................................................................2-3

Set Thermostat Configuration...............................................3-4

Check Thermostat Operation ................................................4-5

Final Settings ............................................................................5

Checklist....................................................................................5

WIRING DIAGRAMS .............................................................6-12

A98426

OPERATIONAL OPERATION ..................................................13

TROUBLESHOOTING ...............................................................13

CONFIGURATION RECORD....................................................14

HEIGHT (IN.)

-1/4

WIDTH (IN.)

DEPTH (IN.)

7-1/2

1-3/8

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 installa-

tion may damage thermostat.

→

Fig. 1—Carrier Programmable Thermostat

Models

Recognize safety information. This is the safety-alert symbol

There are 3 different models. The 9th and 10th letters of the part

number indicate the model. These 2 letters appear on the package

and on the circuit board. Be sure to have the proper thermostat for

the intended application. Models are:

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 CAU-

TION. These words are used with the safety-alert symbol. DAN-

GER 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 would result in minor personal

injury or product and property damage.

AC - 1-stage cool, 1-stage heat - for AC systems only.

HP - 1-stage cool, 2-stage heat - for either HP or AC with 2-stage

heat.

S - 2-stage cool, 2-stage heat - for 2-speed AC systems, or

-stage cool, 3-stage heat - for 2-speed HP systems, or

-stage cool, 4-stage heat - for 1-speed HP with special

-stage electric heat.

INTRODUCTION

Carrier’s 7-day programmable thermostats are wall-mounted, low-

voltage thermostats which maintain room temperature by control-

ling the operation of a heating and air conditioning system.

Separate heating and cooling setpoints, plus auto changeover allow

setback programming for maximum energy savings. All of the

thermostats allow up to 4 time/temperature settings to be pro-

grammed per 24 hr period and store programs for 7 independent

days. Batteries are not required; during a power interruption, the

internal memory stores programs for an unlimited time and the

clock continues to run for at least 72 hrs.

Use each only for its intended purpose. (See Table 1.)

Outdoor Temperature Sensing

→

All Carrier programmable thermostats may be equipped with an

optional

outdoor

temperature

sensor,

Part

No.

TSTATXXSEN01-B. If it is to be used, plan installation so that 2

wires can be run from the thermostat 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 used for its connection. Details are provided

to the sensor instructions.

INSTALLATION CONSIDERATIONS

Power

Note that all TSTAT models require no batteries and are not

INSTALLATION

"power stealing". They do require 24VAC (R and C terminals) to

Step 1—Thermostat Location

be connected for proper operation. Thermostat will not operate

without these 2 connections.

Thermostat should be mounted:

•

Approximately 5 ft (1.5m) from floor.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book

Replaces: TSTAT-10SI

Tab misc. misc.

PC 101

Catalog No. 03TS-TA2

Printed in U.S.A.

Form TSTAT-15SI

Pg 1

9-98

•

Close to or in a frequently used room, preferably on an inside

partitioning wall.

→ Switch D - Intelligent Heat Staging Select

Active on 2S models only)

(

On a section of wall without pipes or duct work.

This switch converts a 2-speed heat pump thermostat with 1 stage

of auxiliary heat into a 1-speed heat pump thermostat with 3 stages

of auxiliary heat for comfortable leaving air temperature. It

requires selected heaters with 2:1 ratio element sizes plus an FK,

FV, 40FKA fan coil. Refer to variable-speed fan coil literature for

details.

Thermostat should NOT be mounted:

•

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

to the outside.

•

Exposed to direct light and heat from a lamp, sun, fireplace, or

other temperature-radiating object which may cause a false

reading.

TO SET:

OFF—for normal 2-speed operation. This is factory default.

ON—for intelligent 3-stage heat with FK, FV, 40FKA fan coil.

•

Close to or in direct airflow from supply registers and return-air

grilles.

Step 3—Install Thermostat

In areas with poor air circulation, such as behind a door or in

an alcove.

→

Step 2—Set DIP Switches

Before installing thermostat, turn off all power to unit. There

may be more than 1 power disconnect. Electrical shock can

cause personal injury or death.

There is a 4 section DIP switch within the thermostat which must

be properly set by the installer. It is easiest to set these 4 switches

before the thermostat is mounted to the wall, so STOP and

complete the following steps:

. Turn OFF all power to unit.

. If an existing thermostat is being replaced:

a. Remove existing thermostat from wall.

. Open hinged thermostat cover.

. Remove cover completely by snapping it apart at hinge.

b. Disconnect wires from existing thermostat, 1 at a time. Be

careful not to allow wires to fall back into the wall.

. Open thermostat by pressing back half of the right end of

plastic case inward while, at the same time, pulling front and

back halves apart at the right end. The 2 halves will swing

apart.

c. As each wire is disconnected, record wire color and

terminal marking.

. Snap hinge apart to completely separate the 2 halves.

d. Discard or recycle old thermostat.

NOTE: Mercury is a hazardous waste and MUST be disposed of

properly.

. Switches are located in upper right corner of circuit board. To

change switch position, use corner of a small screwdriver to

slide switch to opposite position.

3. Open thermostat rear door (mounting base) to expose mount-

ing holes. The base can be removed to simplify mounting.

Snap apart carefully at hinge to separate mounting base from

remainder of thermostat.

. After switches have been set, do not reassemble the 2 halves.

The rear plastic will be first mounted to wall.

Switch A - Zoning Select (Active on all models)

. Route thermostat wires through large hole in mounting base.

Level mounting base against wall (for aesthetic value

only—thermostat need not be leveled for proper operation)

and mark wall through 2 mounting holes.

This switch selects or defeats the 4 cycles per hour limit and a

-minute compressor timeguard. These timers MUST be enabled

for normal operation and disabled for zoning applications. (In

zoning applications the zone control center performs these timing

functions.)

. Drill two 3/16-in. mounting holes in wall where marked.

TO SET:

6. Secure mounting base to wall with 2 screws and anchors

provided, (additional anchoring holes available for more

secure mounting if needed) making sure all wires extend

through hole in mounting base.

OFF— for normal operation. This is the factory default.

ON—for zoned installations ONLY.

Switch B - Setback Recovery (Active on all models)

. Adjust length and routing of each wire to reach proper

terminal and connector block on mounting base with 1/4 in. of

extra wire. Strip only 1/4 in. of insulation from each wire to

prevent adjacent wires from shorting together when con-

nected.

Selects between normal and smart recovery from setback. Normal

recovery changes to the new setpoint at the programmed time.

Smart recovery, which is active in heating mode only, starts earlier

and adjusts the setpoint slowly so that room temperature will arrive

at the programmed temperature at the programmed time.

TO SET:

8. Match and connect equipment wires to proper terminals of the

connector blocks. (See Table 1, and Fig. 2 through 24.) Both

R and C must be connected for proper thermostat operation.

OFF—for smart recovery. This is the factory default.

ON—for normal recovery.

Switch C - HP/AC Select (Active on HP and 2S models only)

Use to select between AC and HP installations. HP and 2S models

have an extra relay to control the HP reversing valve. When a HP

thermostat is placed in the AC mode, this extra relay is converted

to a second stage heat output. This allows thermostat control of

Improper wiring or installation may damage the thermostat.

Check to make sure wiring is correct before proceeding with

installation or turning on unit.

-stage furnaces or 2-stage strip heat with AC systems. (AC mode

. Push any excess wire into wall and against mounting base.

Seal hole in wall to prevent air leaks. Leaks can affect

operation.

also uses W rather than Y for first-stage heat.)

TO SET:

OFF—for HP applications. Extra relay controls reversing valve.

This is factory default.

0. Snap hinge back together.

ON—for AC applications. Extra output can be used for 2-stage

heat.

11. Close thermostat assembly making sure pins on back of circuit

board align with sockets in connector.

→

Table 1—Model Selection and Wiring Diagram Chart

INDOOR

UNIT

AIR CONDITIONER

HEAT PUMP

1 Speed

2 Speed

1 Speed

2 Speed

-Stage

Model AC

See Fig. 2

Model 2S

See Fig. 8

Requires Dual Fuel Ther-

mostat

Model 2S

See Fig. 11

Furnace

-Stage

Model AC

See Fig. 3

Model HP

See Fig. 4

Model 2S

See Fig. 9

Requires Dual Fuel Ther-

mostat

Model 2S

See Fig. 12

Furnace

Model AC

See Fig. 5

Model HP

See Fig. 6

Model 2S

See Fig. 10

Model HP

See Fig. 7

Model 2S

See Fig. 13

Typical Fan Coil

Variable-Speed

Model AC

See Fig. 15

Model HP

See Fig. 16

Model 2S

See Fig. 17

Model 2S

See Fig. 14

Model 2S

See Fig. 18

(FK, FV, 40FKA)

Fan Coil

2. Turn ON power to unit.

On power up, all display segments will light for 5 sec. For the next

sec, a 2-digit code appears on large display which identifies

thermostat configuration:

press SET TIME/TEMP button once. The large display will now

flash, indicating that up and down buttons now control available

choices within that option. Each press of SET TIME/TEMP button

switches between available option (small display) and available

selections within each option (large display).

→

. AC—for 1-speed air conditioner

. HP—for 1-speed heat pump

. A2—for 2-speed air conditioner

. H2—for 2-speed heat pump

CONFIGURATION OPTIONS — SELECTION:

Option 1—Anticipator Adjustment

This adjustment controls sensitivity and cycle rate of thermostat.

Higher numbers decrease sensitivity and slow cycle rate. Lower

numbers increase sensitivity and cycle rate. However, a limiting

feature will not allow more than 4 cycles per hr, regardless of

setting. Anticipator values can range from 1 to 9. Factory default

is 3. This default setting will provide optimum performance in

nearly all installations. Try it first. Do not change setting unless

there is evidence of the need to do so.

. HS—for intelligent heat staging with FK, FV, 40FKA Fan

Coil and 1-speed heat pump

When this identifier disappears, normal operation begins. The

MODE control should be set to OFF and FAN control to AUTO,

so equipment does not start until further configuration and check-

out is completed.

→

Step 4—Set Thermostat Configuration

Unlike conventional anticipators, this setting is not determined by

current draw. There is no need to measure, know, or compensate

for current draw. There is also no droop with this thermostat.

Regardless of setting and number of stages, both heating and

cooling will control to their respective set points.

Configuration options, like DIP switch settings, are intended to be

selected at installation and normally are not modified by the

homeowner. These options are not discussed in the Homeowner’s

Manual and therefore must be made as part of the installation. A

special procedure allows entry into the configuration mode. While

in configuration mode, 7 selections can be made. A description of

each of these and how to use the configuration mode follows.

TO ADJUST:

1. Enter configuration mode if not already there. See above. The

upper small (COOL set point) display will be flashing 01. If

not, use up and down buttons to move it to 01.

CONFIGURATION OPTIONS — SUMMARY:

Option 01—Anticipator adjustment

. Press SET TIME/TEMP button once to flash current selection

of 1, 2, 3, 4, 5, 6, 7, 8, or 9 on large display. Factory default

is 3.

Option 02—Clean filter timer adjustment

Option 03—Fahrenheit or Celsius operation

Option 04—Enable fan (G) ON with any heat (W)

Option 05—07—Not applicable

. Use up and down buttons to move between available choices.

. Press SET TIME/TEMP button again to flash upper small

display for selection of another option, or press END to exit

configuration mode.

Option 08—Auxiliary heat lockout temperature adjustment

Option 09—12—Not applicable

Option 13—Room temperature offset adjustment

Option 14—Not applicable

Option 2—Clean Filter Timer

Select hours of blower operation (heating, cooling, or fan) before

CLEAN FILTER icon is displayed. With OFF selected, icon will

never come on, disabling this feature. Time selection can range

from 400 to 3600 hr by selecting numbers 1 through 9. (Time is

400 X number selected.) Factory default is 2 (800 hr). Recom-

mended selections are: disposable filter—400 to 800 hr, media

filter—1200 to 1600 hr, or electronic air cleaner—1600 to 2400 hr

of blower operation.

Option 15—Enable AUTO mode

TO ENTER CONFIGURATION MODE:

Press and hold FAN button for approximately 10 sec until COOL

set point display indicates a flashing 01. The thermostat is now in

configuration mode. It will automatically exit this mode if no

button is pressed for 3 minutes. Pressing END button will exit

configuration mode immediately.

TO SELECT OR ADJUST:

WHILE IN CONFIGURATION MODE:

. Enter configuration mode if not already there. See above. Use

up and down buttons to make small (now flashing) display

indicate 02.

The upper small (COOL set point) display indicates selected

option number and large display indicates selection made within

that option. One of these will be flashing. The up and down buttons

are used both to move between available options and to make

selection for each option. When option number (small display) is

flashing, up and down buttons adjust it, moving between available

option numbers. After desired option number has been selected,

. Press SET TIME/TEMP button once to flash the current

selection of OF, 1, 2, 3, 4, 5, 6, 7, 8, or 9 on large display.

Factory default is 2.

3. Use up and down buttons to move between available choices.

. Press SET TIME/TEMP button again to flash upper small

display for selection of another option, or press END to exit

configuration mode.

higher or lower value. The selected number is number of degrees,

plus or minus, which will be added to actual temperature. The

numbers can range between -5 and +5. Factory default is 0. This

adjusted value will be used as actual temperature for both display

and control action. For example, if 2 is selected, 72°F actual will

read 74°F. If set point is 72°F, the room will control to an actual

temperature of 70°F which will be displayed and acted upon as if

it were 72°F. The effect is that a positive number selection will

make the room temperature lower and vice versa. The thermostat

is calibrated within an accuracy of plus or minus 1° when shipped

from the factory, so this adjustment will provide the best accuracy

when set to 0.

Option 3—Fahrenheit or Celsius Operation

Select between Fahrenheit and Celsius operation. Factory default

is Fahrenheit.

TO SELECT OR ADJUST:

. Enter configuration mode if not already there. See above. Use

up and down buttons to make small (now flashing) display

indicate 03.

. Press SET TIME/TEMP button once to flash current selection

of F or C. Factory default is F.

TO SELECT:

. Enter configuration mode if not already there. See above. Use

up and down buttons to make small (now flashing) display

indicate 13.

. Use up and down buttons to move between F and C on large

display.

. Press SET TIME/TEMP button again to flash upper small

display for selection of another option, or press END to exit

configuration mode.

. Press SET TIME/TEMP button once to flash large display.

3. Use up or down buttons to move between -5, -4, -3, -2, -1, 0,

, 2, 3, 4, or 5 on large display. Factory default is 0.

Option 4—Enable Fan (G) On With Any Heat (W)

. Press SET TIME/TEMP button again to flash upper small

display for selection of another option, or press END to exit

configuration mode.

This selection determines whether the G (fan) output is to be on or

off when any W (furnace or strip heat) output is ON. Most fan coils

manage their own blowers and do not require a separate G signal.

For these applications, select OF (off). Some auxiliary heaters

require a separate G signal to turn on the blower. In this case,

select ON. Factory default is OF.

Option 15—Enable Auto Mode

This option allows the installer to enable or disable AUTO mode

automatic changeover between heat and cool). When disabled,

(

TO SELECT:

AUTO icon does not appear when successive presses of MODE

button are used to move between OFF, HEAT, COOL, and

EHEAT (in heat pump systems). Factory default is ON (AUTO

enabled).

. Enter configuration mode if not already there. See above. Use

up and down buttons to make small (now flashing) display

indicate 04.

TO SELECT:

. Press SET TIME/TEMP button once to flash currect selection

of OF or ON. Factory default is OF.

1. Enter configuration mode if not already there. See above. Use

up and down buttons to make small (now flashing) display

indicate 15.

. Use up and down buttons to move between OF and ON on

large display.

. Press SET TIME/TEMP button once to flash large display.

. Press SET TIME/TEMP button again to flash upper small

display for selection of another option, or press END to exit

configuration mode.

3. Use up and down buttons to move between OF and ON on

large display. Factory default is ON (AUTO enabled).

Option 8—Auxiliary Heat Lockout Temperature

4. Press SET TIME/TEMP button again to flash upper small

display for selection of another option, or press END to exit

configuration mode.

Present in heat pump and 2-speed models only when configured as

a heat pump. Outdoor temperature sensor must be attached. This

option allows selection of an outdoor temperature of 5 through

→

Step 5—Check Thermostat Operation

5°F in 5° steps (or equivalent values in C), or OF (off). Auxiliary

Before doing the checkout, press HOLD button to turn on HOLD

icon, locking thermostat in hold mode. This will assure set points

don’t change during the checkout. Outputs for each stage of

operation are listed in Table 2. In the table, the actual use of each

terminal is underlined for terminals having double use.

heat is prevented from operating for outdoor temperatures above

the selected temperature. If OF (off) is selected, auxiliary heat is

allowed at all outdoor temperatures. If selected, emergency heat

(EHEAT) overrides this feature. Factory default is OF.

TO SELECT:

TO TEST THE FAN:

. Enter configuration mode if not already there. See above. Use

up and down buttons to make small (now flashing) display

indicate 08.

. Press FAN button. The fan ON icon and the G output will go

on within a few seconds, causing fan to operate.

. Pressing FAN button again will turn off the G output and turn

off fan AUTO icon.

. Press SET TIME/TEMP button once to flash large display.

. Use up or down buttons to move between OF, 5, 10, 15, 20,

TO TEST COOLING:

5, 30, 35, 40, 45, 50, or 55 on large display. Factory default

is OF.

Press MODE button until COOL icon under it turns on. Press

down button until cool set point (upper right 2 digit display with

COOL now flashing under it) is 2° or 3° below room temperature.

This will create a cooling demand. A small triangle to the left of

this COOL icon will flash or come on continually. Flashing means

the equipment is going to turn on but is presently being held off by

a system timer. (See Operational Information for timer descrip-

tions.) Defeat the timer by pressing INCREASE TEMPERATURE

button (up and FAN buttons together). This will make the triangle

. Press SET TIME/TEMP button again to flash upper small

display for selection of another option, or press END to exit

configuration mode.

Option 13—Room Temperature Offset Adjust

This option allows calibration (or deliberate miscalibration) of

room temperature sensor. There are various reasons why home-

owners may want to have displayed temperature adjusted to a

stay on and turn Cool Stage 1 on. For actual outputs, refer to Table

, making sure the correct row from the table is selected. To turn

off, raise cooling set point above the room temperature. Cool Stage

and the triangle will turn off within a few seconds.

TO TEST EMERGENCY HEAT (heat pump systems only):

To test, press MODE button until EHEAT icon turns on. This will

allow operation of auxiliary heat only. Raising set point above

room temperature will turn on the first stage of auxiliary heating

(W/W1). Raising set point more than 5° above room temperature

will advance to full heat, if it is available (O/W2 or Y1/W2 will

come on—see Table 2). Reducing set point below room tempera-

ture will turn all heat off.

If system has 2 cooling stages, it will start on Cool Stage 1 and

proceed to Cool Stage 2, 15 minutes later due to a staging timer

which requires 15 minutes between successive stages. The IN-

CREASE TEMPERATURE button (up and FAN buttons) cannot

be used to defeat this timer. This timer can be defeated by reducing

the set point to more than 5° below room temperature, bringing on

a Cool Stage 2 demand within 5 seconds. Remember: 2 stage

cooling units often have a 1 minute off time between lo and high,

so the thermostat’s demand will not show immediately as a change

in the outdoor unit. It will show immediately as an increase in the

indoor fan speed.

→ Step 6—Final Settings

. Assuming the system is to be left in operation after the

installation is complete, use MODE button to select between

HEAT, COOL, EHEAT, or AUTO to provide the desired

operation of heating, cooling, or both.

. The default set points 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.

TO TEST HEATING:

Press MODE button until HEAT icon under it turns on. Press up

button until HEAT set point (LOWER right 2 digit display with

HEAT now flashing under it) is 2° or 3° (not more) above room

temperature. This will create a Heat Stage 1 demand. A small

triangle to the left of this HEAT icon will flash or come on

continually. Flashing means the equipment is going to turn on but

is presently being held off by a system timer. (See Operational

Information for timer descriptions.) Defeat timer by pressing

INCREASE TEMPERATURE button (up and FAN buttons to-

gether). This will make the triangle stay on and turn on Heat Stage

. Turn on HOLD if fixed set points are to be used. If the

programmed schedule is to be used, make sure the HOLD icon

is off.

4. For further information on temperature selection and program-

ming, refer to Homeowner’s Manual.

. If AUTO mode is to be used, be sure both heat and cool set

points are properly adjusted.

. To turn off, reduce heating set point below room temperature.

. The FAN button may be used to select between AUTO (fan on

only with equipment) and FAN (fan on continuously) fan

modes.

The heating and the triangle will turn off within a few seconds.

If the system has multiple heat stages, it will start on Heat Stage 1

and proceed to Heat Stage 2, 15 minutes later due to a staging

timer which requires 15 minutes between successive stages. The

INCREASE TEMPERATURE button (up and FAN buttons)

cannot be used to defeat this timer. If set point is raised more than

→

Step 7—Checklist

. Put away tools and instruments, and clean up debris.

. Review Homeowner’s Guide with owner.

. Leave literature packet with owner.

° above room temperature, the staging timer is defeated and the

thermostat will call for higher stages within 5 sec. Use this method

if there are only 2 stages of heat. If more than 2 stages of heat are

available, do not use this method because once the demand

exceeds 5°, the thermostat may jump to the highest stage. With

more than 2 stages available, let the timer advance one stage every

4. Fill out and return survey card.

5 minutes.

MODEL AC

THERMOSTAT

SINGLE-STAGE

FURNACE

SINGLE-SPEED

AIR CONDITIONER

4 VAC HOT

FAN

HEAT STAGE 1 W/W1

COOL STAGE 1 Y/Y2

N/A

O/W2

Y1/W2

24 VAC COMM

N/A

OUTDOOR

SENSOR

CONNECTION

See note 1

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF OFF OFF

A98485

→

Fig. 2—Single-Speed Air Conditioner

with Single-Stage Furnace—Model AC Thermostat

TWO-STAGE OR

VARIABLE-SPEED

FURNACE

TWO-STAGE OR

VARIABLE-SPEED

FURNACE

MODEL HP

THERMOSTAT

SINGLE-SPEED

MODEL AC

THERMOSTAT

SINGLE-SPEED

AIR CONDITIONER

4 VAC HOT

FAN

HEAT STAGE 1 W/W1

COOL STAGE 1 Y/Y2

HEAT STAGE 2 O/W2

W/W1

Y/Y2

HEAT STAGE 1 W/W1

COOL STAGE 1 Y/Y2

W/W1

Y/Y2

N/A

O/W2

N/A

Y1/W2

HUM

4 VAC COMM

N/A

OUTDOOR

SENSOR

OUTDOOR

SENSOR

See notes 1 and 6

See note 2

CONNECTION S2

CONNECTION

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF OFF OFF

OFF OFF ON OFF

A98486

A98487

→

Fig. 3—Single-Speed Air Conditioner

with 2-Stage or Variable-Speed Furnace

Model AC Thermostat

→ Fig. 4—Single-Speed Air Conditioner

with 2-Stage or Variable-Speed Furnace

—Model HP Thermostat

—

MODEL HP

THERMOSTAT

TYPICAL

FAN COIL

SINGLE-SPEED

AIR CONDITIONER

MODEL AC

TYPICAL

SINGLE-SPEED

THERMOSTAT

FAN COIL

AIR CONDITIONER

24 VAC HOT

FAN

4 VAC HOT

FAN

HEAT STAGE 1 W/W1

COOL STAGE 1 Y/Y2

HEAT STAGE 2 O/W2

COOL STAGE 1 Y/Y2

HEAT STAGE 1 W/W1

N/A

O/W2

N/A

Y1/W2

4 VAC COMM

N/A

OUTDOOR

SENSOR

OUTDOOR

SENSOR

See notes 2, 7, and 8

See notes 1, 7, and 8

CONNECTION

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF OFF OFF

OFF OFF ON OFF

A98488

A98489

→

Fig. 5—Single-Speed Air Conditioner

with Typical Fan Coil—Model AC Thermostat

Single-Stage Heat Control)

→

Fig. 6—Single-Speed Air Conditioner

with Typical Fan Coil—Model HP Thermostat

Dual-Stage Heat Control)

(

MODEL HP

THERMOSTAT

TYPICAL

SINGLE-SPEED

HEAT PUMP

MODEL 2S

SINGLE-STAGE

FURNACE

TWO-SPEED

FAN COIL

THERMOSTAT

AIR CONDITIONER

4 VAC HOT

COOL STAGE 1 Y1/W2

FAN

RVS COOLING O/W2

HEAT STAGE 1 W/W1

COOL STAGE 2 Y/Y2

COOL/HEAT Y/Y2

STAGE 1

HEAT STAGE 2

W/W1

N/A

O/W2

N/A

Y1/W2

4 VAC HOT

4 VAC COMM

24 VAC COMM

N/A

OUTDOOR

SENSOR

OUTDOOR

SENSOR

See notes 3, 7, and 8

CONNECTION

See note 2

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF OFF OFF

OFF OFF ON OFF

A98490

A98491

→

Fig. 7—Single-Speed Heat Pump

→ Fig. 8—Two-Speed Air Conditioner

with Single-Stage Furnace—Model 2S Thermostat

with Typical Fan Coil—Model HP Thermostat

MODEL 2S

THERMOSTAT

TYPICAL

FAN COIL

TWO-SPEED

AIR CONDITIONER

MODEL 2S

TWO-STAGE OR

VARIABLE-SPEED

FURNACE

TWO-SPEED

THERMOSTAT

AIR CONDITIONER

4 VAC HOT

COOL STAGE 1 Y1/W2

Y1 *

FAN

HEAT STAGE 1 W/W1

COOL STAGE 2 Y/Y2

HEAT STAGE 2 O/W2

COOL STAGE 1 Y1/W2

HEAT STAGE 1 W/W1

COOL STAGE 2 Y/Y2

HEAT STAGE 2 O/W2

W/W1

Y/Y2

24 VAC HOT

24 VAC COMM

4 VAC COMM

N/A

HUM

OUTDOOR

SENSOR

OUTDOOR

SENSOR

CONNECTION

CONNECTION S2

See notes 2, 7, and 8

See notes 2, 5, and 7

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF ON OFF

A98493

A98492

→

Fig. 10—Two-Speed Air Conditioner

→

Fig. 9—Two-Speed Air Conditioner

with Typical Fan Coil—Model 2S Thermostat

with 2-Stage or Variable-Speed Furnace

—

Model 2S Thermostat

MODEL 2S

THERMOSTAT

TWO-STAGE OR

VARIABLE-SPEED

FURNACE

TWO-SPEED

HEAT PUMP

MODEL 2S

THERMOSTAT

SINGLE-STAGE

FURNACE

TWO-SPEED

HEAT PUMP

COOL/HEAT Y1/W2

STAGE 1

Y1 *

COOL/HEAT Y1/W2

STAGE 1

RVS COOLING O/W2

HEAT STAGE 3 W/W1

W/W1

HEAT STAGE 3 W/W1

COOL/HEAT

STAGE 2

Y/Y2

COOL/HEAT

STAGE 2

Y/Y2

FAN

24 VAC HOT

4 VAC COMM

N/A

HUM

N/A

OUTDOOR

SENSOR

OUTDOOR

SENSOR

CONNECTION

See notes 3, 6, 7, 9, and 11

See notes 3, 9, and 11

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF OFF OFF

A98494

A98495

→

Fig. 11—Two-Speed Heat Pump

with Single-Stage Furnace

→ Fig. 12—Two-Speed Heat Pump

with 2-Stage or Variable-Speed Furnace

—Model 2S Thermostat

—

Model 2S Thermostat

MODEL 2S

THERMOSTAT

SINGLE-SPEED

HEAT PUMP

EASY SELECT

TERMINAL BOARD

MODEL 2S

THERMOSTAT

TYPICAL

FAN COIL

TWO-SPEED

HEAT PUMP

JUMPER

24 VAC HOT

4 VAC HOT

FAN

COOL/HEAT Y/Y2

STAGE 1

Y/Y2

REMOVE

HEAT STAGE 3 W/W1

HEAT STAGE 2 W/W1

HEAT STAGE 3 Y1/W2

RVS COOLING O/W2

J2 JUMPER

FOR HEAT

STAGING

COOL/HEAT Y/Y2

STAGE 2

RVS COOLING O/W2

COOL/HEAT Y1/W2

STAGE 1

4 VAC COMM

24 VAC COMM

N/A

OUTDOOR

SENSOR

See notes 3, 4, and 8

OUTDOOR

SENSOR

CONNECTION S2

See notes 3, 7, 8, 9, and 11

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF OFF ON

A98497

OFF OFF OFF OFF

→ Fig. 14—Single-Speed Heat Pump

with Variable-Speed Fan Coil (FK, FV, 40FKA)

and Special 3-Stage Electric Heat

—Model 2S Thermostat

A98496

→

Fig. 13—Two-Speed Heat Pump

with Typical Fan Coil—Model 2S Thermostat

MODEL AC

THERMOSTAT

SINGLE-SPEED

AIR CONDITIONER

MODEL HP

THERMOSTAT

SINGLE-SPEED

AIR CONDITIONER

EASY SELECT

TERMINAL BOARD

EASY SELECT

TERMINAL BOARD

J1 JUMPER

JUMPER

24 VAC HOT

FAN

HEAT STAGE 1 W/W1

J2 JUMPER

REMOVE

N/A

FAN

N/A

O/W2

HEAT STAGE 1 W/W1

HEAT STAGE 2 O/W2

COOL STAGE 1 Y/Y2

Y/Y2

J2 JUMPER

FOR HEAT

STAGING

Y1/W2

COOL STAGE 1 Y/Y2

Y/Y2

N/A

Y1/W2

4 VAC COMM

24 VAC COMM

N/A

OUTDOOR

SENSOR

OUTDOOR

SENSOR

See notes 1 and 8

See notes 2 and 8

CONNECTION S2

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF OFF OFF

OFF OFF ON OFF

A98498

A98499

→

Fig. 15—Single-Speed Air Conditioner

with Variable-Speed Fan Coil

→ Fig. 16—Single-Speed Air Conditioner

with Variable-Speed Fan Coil

(FK, FV, 40FKA)—Model HP Thermostat

(FK, FV, 40FKA)—Model AC Thermostat

MODEL 2S

THERMOSTAT

TWO-SPEED

HEAT PUMP

EASY SELECT

MODEL 2S

THERMOSTAT

TWO-SPEED

AIR CONDITIONER

TERMINAL BLOCK

EASY SELECT

TERMINAL BOARD

J1 JUMPER

4 VAC HOT

JUMPER

24 VAC HOT

FAN

COOL/HEAT Y1/W2

STAGE 1

COOL STAGE 1 Y1/W2

COOL STAGE 2 Y/Y2

HEAT STAGE 1 W/W1

HEAT STAGE 2 O/W2

RVS COOLING� O/W2

Y/Y2

COOL/HEAT Y/Y2

STAGE 2

Y/Y2

REMOVE

J2 JUMPER

FOR HEAT

STAGING

HEAT STAGE 3 W/W1

J2 JUMPER

4 VAC COMM

N/A

OUTDOOR

SENSOR

OUTDOOR

SENSOR

See notes 3, 8, 9, and 11

CONNECTION

See notes 2 and 8

CONNECTION S2

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF OFF OFF

A98501

OFF OFF ON OFF

A98500

→

Fig. 18—Two-Speed Heat Pump

with Variable-Speed Fan Coil

→

Fig. 17—Two-Speed Air Conditioner

with Variable-Speed Fan Coil

FK, FV, 40FKA)—Model 2S Thermostat

(FK, FV, 40FKA)—Model 2S Thermostat

(

MODEL AC

THERMOSTAT

SPLICE

BOX

HEATER

CONTROL BOX

MODEL AC

THERMOSTAT

SPLICE

BOX

N/A

Y1/W2

RED

GRN

WHT

YEL

4 VAC HOT

GRN

WHT

YEL

FAN

HEAT STAGE 1 W/W1

COOL STAGE 1 Y/Y2

WHT

HEAT STAGE 1 W/W1

COOL STAGE 1 Y/Y2

N/A

O/W2

N/A

O/W2

RED

BRN

4 VAC HOT

Y1/W2

4 VAC COMM

BRN

4 VAC COMM

N/A

OUTDOOR

SENSOR

OUTDOOR

SENSOR

See notes 1, 11, and 12

See notes 1 and 11

CONNECTION

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF OFF OFF

A98502

A98503

→

Fig. 19—Single-Speed Packaged Air Conditioner

with Single-Stage Gas Furnace (48SS, SX)

→ Fig. 20—Single-Speed Packaged Air Conditioner

with Single-Stage Electric Heat (50SS, SX, ZP)

MODEL HP

THERMOSTAT

SPLICE

BOX

HEATER

CONTROL BOX

MODEL HP

THERMOSTAT

SPLICE

BOX

HEATER

CONTROL BOX

YEL

COOL STAGE 1 Y/Y2

COOL/HEAT

YEL

Y/Y2

STAGE 1

GRN

FAN

HEAT STAGE 1 W/W1

N/A

Y1/W2

HEAT STAGE 2 O/W2

ORN

RVS COOLING O/W2

WHT

N/A

HEAT STAGE 2 W/W1

Y1/W2

RED(TRAN)

PNK

VIO

WHT

GRN

RED

WHT

FAN

RED

BRN

24 VAC HOT

RED

BRN

24 VAC HOT

4 VAC COMM

BRN

24 VAC COMM

BRN

N/A

OUTDOOR

SENSOR

See notes 2, 10, 11, and 12

OUTDOOR

SENSOR

See notes 3, 11, and 12

CONNECTION

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF ON OFF

A98504

OFF OFF OFF OFF

A98505

→

Fig. 21—Single-Speed Packaged Air Conditioner

with 2-Stage Electric Heat (50SS, SX, ZP)

→

Fig. 22—Single-Speed Packaged Heat Pump

with Single-Stage Electric Heat (50HS, HX, ZH)

MODEL HP

THERMOSTAT

SPLICE

BOX

HEATER

CONTROL BOX

MODEL HP

THERMOSTAT

SPLICE

BOX

VIO

HEAT STAGE 2 W/W1

RVS COOLING O/W2

COOL/HEAT

YEL

Y/Y2

STAGE 1

ORN

RVS COOLING O/W2

WHT

YEL

N/A

Y1/W2

WHT

RED

N/A

Y1/W2

COOL/HEAT

STAGE 1

Y/Y2

HEAT STAGE 2

WHT

GRN

RED

W/W1

GRN

RED

FAN

4 VAC HOT

BRN

4 VAC COMM

BRN

PNK

BRN

4 VAC COMM

RED(TRAN)

N/A

OUTDOOR

SENSOR

OUTDOOR

SENSOR

See notes 3, 10, 11, and 12

CONNECTION

See notes 3, 11, and 12

CONNECTION

SUGGESTED DIP

SWITCH SETTINGS

SUGGESTED DIP

SWITCH SETTINGS

OFF OFF OFF OFF

A98506

A98507

→

Fig. 23—Single-Speed Packaged Heat Pump

with 2-Stage Electric Heat (50HS, HX, ZH)

→ Fig. 24—Single-Speed Packaged Heat Pump

with Single-Stage Gas Furnace (48HX)

→

WIRING DIAGRAM NOTES

. The AC model thermostat can only control 1-stage cool and 1-stage heat. Dip Switch-C on has no controlling function and can either be

ON or OFF.

. HP and 2S model thermostat MUST have Dip Switch-C ON when installed in air conditioner applications. If required, second-stage heat

is controlled by O/W2. Refer to indoor equipment Installation Instructions for proper setup.

. HP and 2S model thermostat MUST have Dip Switch-C OFF when installed in heat pump applications. The reversing valve is controlled

by O/W2.

. Intelligent Heat Staging Option: 2S model thermostat with Dip Switch-C OFF and Switch-D ON. This provides single-stage heat pump

operation Y/Y2, with three-stage auxiliary heat via W/W1 and Y1/W2. Refer to variable-speed fan coil Installation Instructions. Proper

’intelligent heat capable’ electric heater package must be used.

. As an option, lock the furnace into low-fire operation and let O/W2 control high-fire operation. Refer to indoor equipment Installation

Instructions for proper setup.

. Furnace must control its own second-stage heat operation via furnace control algorithm. Refer to indoor equipment Installation Instructions

for proper setup.

. Terminals marked with * may not be present on equipment.

. Refer to fan coil Installation Instructions for proper wiring.

. Select the "ZONE" position on the 2-speed heat pump control board.

0. Omit red and pink wires from diagram with wiring a 50ZP, ZH with 2-stage heaters.

1. Refer to outdoor equipment Installation Instructions for proper setup.

2. Program thermostat to bring on G (fan) with any W (heat) selection. See section under "set thermostat configuration."

→

OPERATIONAL INFORMATION

Five-minute Compressor Timeguard

This timer prevents the compressor from starting unless it has been off for at least 5 minutes. It can be defeated for 1 cycle by simultaneously

pressing the FAN mode button and the INCREASE TEMPERATURE button.

Fifteen-minute Cycle Timer

This timer prevents the start of a heating or cooling cycle until at least 15 minutes after the last start of the same cycle. Its function is to assure

that equipment is not cycled more than 4 times per hour. This timer is defeated for 1 cycle when the desired temperature is manually changed.

It can also be defeated for 1 cycle by simultaneously pressing the FAN mode button and the INCREASE TEMPERATURE button.

Fifteen-minute Staging Timer

In multistage heating or cooling, this timer prevents any higher stage from turning on until the preceding stage has been on for 15 minutes.

This timer is defeated if the temperature error is greater than 5˚F (usually due to a large change in desired temperature).

Three-minute Minimum On Time

In normal operation, when a stage turns on, it will not turn off for a minimum of 3 minutes.

Heat/Cool Set Points (Desired Temperatures)

A minimum difference of 2 degrees is enforced between heating and cooling set points. This is done by allowing one setting to "push" the other,

to maintain this difference.

Auto Changeover

When the 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 the setpoint is changed, the 20 minute requirement is deleted.

Emergency Heat Mode

When thermostat is configured as a heat pump and emergency heat mode is selected, all Y signals are locked out and W becomes energized

upon a call for heat.

Power On Check

When AC power is first applied, all segments of the display are turned on for a few seconds. Following this, the temperature display indicates

the model/configuration via the following 2 digit code:

AC—1-speed air conditioner, HP—1-speed heat pump, A2—2-speed air conditioner, H2—2-speed heat pump, HS—1-speed heat pump with

Intelligent Heat staging (3-stage auxiliary heat).

Error Codes

-- — If the thermostat cannot properly read room temperature, the display will indicate "--" (2 dashes) and all outputs (except the fan if on)

will turn off. This is to prevent operation of the equipment if the thermostat has failed.

E2 — If the AC line voltage drops below a minimum (brownout) level, all outputs are turned off and the display indicates E2. This condition

will remain for 15 seconds after proper line voltage is restored. If the AC line voltage disappears completely, the display will

immediately go blank.

E3 — If thermostat cannot properly read outdoor temperature, and/or it is needed for proper operation, (i.e. Option 8 is ON with no sensor

attached), E3 will alternate with room temperature on the room temperature display and the outdoor temperature will read "--".

Outdoor Temperature

When an outdoor temperature sensor is attached, outdoor temperature can be read by pressing up and down buttons together. While it is

displayed, the letters "od" also appear in the heat set point display.

Smart Recovery

With Smart Recovery selected, the transition out of a heating setback begins 90 minutes early, gradually adjusting room temperature so that

the desired temperature will be achieved at the selected time.

→

Thermostat Troubleshooting

SYMPTOM

WHAT TO CHECK

Temperature sensor reading out of range. Check sensor for damage. If recycyling power

does not clear display, thermostat should be replaced.

"--" on temperature display

Brownout condition or too low of voltage to thermostat. Double check wiring and check for

E2" on temperature display

E3" on temperature display

24 VAC between R and C. E2 will clear 15 seconds after proper voltage is restored.

Outdoor temperature reading out of range and needed for Option 8. Check outdoor tem-

perature sensor and its wiring.

After the selected number of hours of blower operation "clean filter" will display on LCD.

This is to remind the homeowner to "check" filter. Press "reset filter" button to clear dis-

play and reset timer to 0.

"Clean Filter" on temperature display

Select COOL mode. Decrease cooling setpoint to 10 degrees below room temperature.

Simultaneously press FAN and INCREASE TEMPERATURE buttons to defeat timers.

Check for 24 VAC at Y/Y2 terminal. If present, thermostat is OK and problem is with

equipment or wiring. If not present, replace thermostat.

Cooling will not come on

Select HEAT mode. Increase heating setpoint to 10 degrees above room temperature.

Simultaneously press FAN and INCREASE TEMPERATURE buttons to defeat timers.

Check for 24 VAC at Y/Y2 (with HP) or W/W1 (with AC) terminal. If present, thermostat is

OK and problem is with equipment or wiring. If not present, replace thermostat.

Heating will not come on

PROGRAMMABLE THERMOSTAT CONFIGURATION RECORD

Date

Owner/Operator

Thermostat Model No.

A) Hardware Configuration

�

Switch A�

Switch B�

Switch C�

Switch D�

Zoning Selection. (OFF = Disable, ON = Enable)

Smart Recovery. (OFF = Enable, ON = Disable)

Heat Pump Operation. (OFF = Enable, ON = Disable)

Intelligent Heat Staging. (OFF = Disable, ON = Enable)

B) Mode Settings

Hold (On or Off)

Mode (Off, Heat, Cool, Auto, Eheat)

Heating Set Point Value

Cooling Set Point Value

Fan (Auto or On)

C) Configuration Options

��

-7��

Anticipator (1-9: factory default = 3)

Clean Filter Timer (Off or 1-9: factory default = 2)

Fahrenheit or Celsius (F or C: factory default = F)

Fan On with W (Off or On: factory default = Off)

N/A

Auxiliary Heat Lockout (Off or 5-55°F: factory default = Off)

N/A

Room Temperature Offset (-5 to +5: factory default = 0)

N/A

Enable Auto Mode (Off or On: factory default = On)��

-12��

3��

4��

5��

D) Schedule

WAKE

DAY

EVE

SLEEP

TIME HEAT COOL TIME HEAT COOL TIME HEAT COOL TIME HEAT COOL

Mon

Tue

Wed

Thu

Fri

Sat

Sun

A98508

SERVICE TRAINING

Packaged Service Training programs are an excellent way to increase your

knowledge of the equipment discussed in this manual, including:�

�

��

�

• Unit Familiarization��

• Installation Overview�

• Maintenance�

• Operating Sequence�

A large selection of product, theory, and skills programs is available, using popular

video-based formats and materials. All include video and/or slides, plus companion

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Classroom Service Training plus "hands-on" the products in our labs can mean

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CALL FOR FREE CATALOG 1-800-962-9212�

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[

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A94328

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