ClimateMaster ATP21W02 Installation Instructions Manual - User Manual

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Installation Instructions for

Heating & Air Conditioning

ATP21W02

97B0082N07

5/2 Day Programmable

Heat Pump Thermostat

CONTENTS

PREPARATIONS

THERMOSTAT DETAILS

REMOVING OLD THERMOSTAT

Before removing wires from old thermostat

s switching subbase,

label each wire with the terminal designation it was removed from.

1. Remove Old Thermostat: A standard heat/cool thermostat

consists of three basic parts:

a. The cover, which may be either a snap-on or hinge type.

b. The base, which is removed by loosening all captive screws.

c. The switching subbase, which is removed by unscrewing

the mounting screws that hold it on the wall or adaptor plate.

2. Shut off electricity at the main fuse box until installation is

complete. Ensure that electrical power is disconnected.

3. Remove the front cover of the old thermostat. With wires still

attached, remove wall plate from the wall. If the old thermostat
has a wall mounting plate, remove the thermostat and the wall
mounting plate as an assembly.

4. Identify each wire attached to the old thermostat.

5. Disconnect the wires from the old thermostat one at a time. DO

NOT LET WIRES FALL BACK INTO THE WALL.

6. Install new thermostat using the following procedures.

To prevent electrical shock and/or equipment damage,
disconnect electrical power to the system at the main
fuse or circuit breaker until installation is complete.

CAUTION

Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage.

Assemble tools required as shown below.

YOUR THERMOSTAT REPLACES

WIRE CUTTER/STRIPPER

Description

Heat Pump (No Aux or Emergency Heat)

Yes

Heat Pump (with Aux or Emergency Heat)

Yes

Millivolt Heat Only Systems – Floor or Wall Furnaces

Hydronic (Hot Water) Zone Heat – 2 Wires

Hydronic (Hot Water) Zone Heat – 3 Wires

HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED

FLAT BLADE SCREWDRIVER

SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—

THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY

Figure 1. Thermostat base

W905

Clip for

Slow Cycle

W904

Clip for

Celsius

W903

Clip to

Disable

EMR

Feature

Mounting

hole

W906 for Emergency

Heat Second Stage

Fan Control

O/B

Terminal

Switches

Selection

Mounting

hole

Preparations .................................................1

Thermostat Details .......................................1

Removing Old Thermostat ........................ 1-2

Mounting and Wiring................................. 2-3

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

Programming your Thermostat ................. 6-7

Specifi cations ...............................................7

Troubleshooting ........................................ 7-8

Revision History..........................................12

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MOUNTING AND WIRING

Take care when securing and routing wires so they do
not short to adjacent terminals or rear of thermostat.
Personal injury and/or property damage may occur.

CAUTION

ATTENTION! This product does not contain mercury. How-
ever, this product may replace a unit which contains mercury.

Do not open mercury cells. If a cell becomes damaged, do not
touch any spilled mercury. Wearing non-absorbent gloves, take
up the spilled mercury and place into a container which can be
sealed. If a cell becomes damaged, the unit should be discarded.

Mercury must not be discarded in household trash. When the unit
this product is replacing is to be discarded, place in a suitable
container and return to White-Rodgers at 2895 Harrison Street,
Batesville, AR 72501-2117 for proper disposal.

REMOVING OLD THERMOSTAT

CONTINUED FROM FIRST PAGE

Electric/Gas Jumper (Fan Option)

If your emergency or auxiliary system will energize the blower, then
jumper W906 on the thermostat base must be cut (see fig. 1).

If your emergency or auxiliary heat system requires that the
thermostat energize the fan circuit, do not cut jumper W906.

If you are unsure of your application, contact a qualified service
person.

F or

C Selection

The factory default setting for temperature display is Fahrenheit.
If you want the temperature in Celsius, clip jumper W904.

Fast or Slow Cycle Selection

The factory default setting is fast cycle, which cycles 1st stage at
approximately 1.2

F and 2nd stage 0.75

F. If you prefer slow

cycle, clip jump W905. The 1st stage and 2nd stage would be
1.5

F and 1.2

F respectively.

Energy Management Recovery (EMR)

This thermostat is set to operate with EMR. This causes the
thermostat to start the heating or cooling system early to have
the room temperature reach the program setpoint at the time
the period is to start.

To disable EMR, clip jumper W903 (see Fig. 1).

Attach Thermostat Base to Wall

1. Remove the packing material from the thermostat. Gently pull

the cover straight off the base. Forcing or prying on the
thermostat will cause damage to the unit.

2. Connect wires beneath terminal screws on base using appro-

priate wiring schematic (see figs. 2 through 4).

3. Place base over hole in wall and mark mounting hole locations

on wall using base as a template.

4. Move base out of the way. Drill mounting holes.

5. Fasten base loosely to wall, as shown in fig. 1, using two

mounting screws. Place a level against bottom of base, adjust
until level, and then tighten screws. (Leveling is for appear-
ance only and will not affect thermostat operation.) If you are
using existing mounting holes, or if holes drilled are too large
and do not allow you to tighten base snugly, use plastic screw
anchors to secure subbase.

6. Push excess wire into wall and plug hole with a fire-resistant

material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.

Battery Location

This thermostat does not require batteries to operate. The 2 “AAA”
alkaline batteries are for the thermostat to remember the pro-
gramming if AC voltage is lost. If the display shows BATT when
AC power is not present, the batteries are low and should be
replaced with fresh “AAA” Energizer

alkaline batteries. To re-

place the batteries, install the batteries along the top of the base
(see fig. 1). The batteries must be installed with the positive (+)
ends to the right.

O/B Terminal Switch Selection

The O/B switch on this thermostat is factory set to “O” position.
This will accommodate the majority of heat pump applications,
which require the changeover relay to be energized in COOL. If
the thermostat you are replacing or the heat pump being installed
with this thermostat requires a “B” terminal, to energize the
changeover relay in HEAT, the O/B switch must be moved to the
“B” position.

WARNING

Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.

Do not short out terminals on gas valve or primary
control to test. Short or incorrect wiring will damage
thermostat and could cause personal injury and/or
property damage.

Thermostat installation and all components of the
system shall conform to Class II circuits per NEC
code.

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MOUNTING AND WIRING

CONTINUED FROM SECOND PAGE

24 VAC

120 VAC

Hot

SYSTEM

MONITOR

SWITCH

Neutral

THERMOSTAT

SYSTEM

Figure 2. Typical wiring diagram for single transformer systems

TRANSFORMER

(Class II)

Changeover

Relay*

O/B

Compressor

Contactor

* Changeover Relay is energized in COOL when O/B switch is in the “O” position

Changeover Relay is energized in HEAT when O/B switch is in the “B” position

Aux

Relay

(Stage 2)

Fan

Relay

Emergency

Relay

See Note **

** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency

24 VAC

120 VAC

Hot

SYSTEM

MONITOR

SWITCH

Neutral

THERMOSTAT

SYSTEM

Figure 3. Typical wiring diagram for two transformer systems with NO safety circuits

TRANSFORMER

(Class II)

Changeover

Relay*

O/B

Compressor

Contactor

* Changeover Relay is energized in COOL when O/B switch is in the “O” position

Changeover Relay is energized in HEAT when O/B switch is in the “B” position

Aux

Relay

(Stage 2)

Fan

Relay

Emergency

Relay

Limit or

Safety

Switches

TWO COMMONS MUST
BE JUMPERED TOGETHER!

HOT

NEUTRAL

120 VAC

24 VAC

CUT AND

TAPE OFF!

If safety circuits are in only one of the systems, remove
the transformer of the system with NO safety circuits.

NOTE

** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency

See Note **

SYSTEM

MONITOR

SWITCH

Figure 4. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems

Changeover

Relay*

O/B

Compressor

Contactor

* Changeover Relay is energized in COOL when O/B switch is in the “O” position

Changeover Relay is energized in HEAT when O/B switch is in the “B” position

Aux

Relay

(Stage 2)

Fan

Relay

Emergency

Relay

TWO COMMONS MUST
BE JUMPERED TOGETHER!

24 VAC

120 VAC

HOT

NEUTRAL

THERMOSTAT

SYSTEM

HOT

NEUTRAL

120 VAC

Limit or

Safety

Switches

Limit or

Safety

Switches

Limit or

Safety

Switches

24 VAC

Limit or

Safety

Switches

COMMON

Auxiliary

Heating

Transformer

(Class II)

Heat Pump Transformer

(Class II)

24 VAC

ACCESSORY

RELAY N.O.

CONTACT

Polarity must be observed. If the HOT side of the second transformer
is jumpered to the COMMON side of the first transformer a short will
be made. Damage to equipment will occur when power is restored.

NOTE

The accessory relay scheme
is required when safety
circuits exist in both systems.

NOTE

See Note **

** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency

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CHECK THERMOSTAT OPERATION

NOTE

To prevent static discharge problems, touch side of ther-
mostat to release static build-up before touching any keys.

If at any time during testing your system does not operate
properly, contact a qualified serviceperson.

Fan Operation

If your system does not have a G terminal connection, skip to
Heating System.

1. Turn on power to the system.

2. Move fan switch to ON position. The blower should begin to

operate.

3. Move fan switch to AUTO position. The blower should stop

immediately.

Do not allow the compressor to run unless the compres-
sor oil heaters have been operational for 6 hours and the
system has not been operational for at least 5 minutes.

Heating System

1. Move SYSTEM switch to HEAT position. If the auxiliary

heating system has a standing pilot, be sure to light it.

2. Press

to adjust thermostat setting to 1

above room

temperature. The heat pump system should begin to operate.
However, if the Flame icon ( ) and Snowflake icon ( ) are
flashing, the compressor lockout feature is operating (see
Configuration menu, item 2.)

3. Adjust temperature setting to 4

above room temperature. The

auxiliary heat system should begin to operate and the Flame
icon ( ) will be flashing.

4. Press

to adjust thermostat setting below room tempera-

ture. The heating system should stop operating.

Emergency System

EMER bypasses the Heat Pump to use the heat source wired
to terminal E on the thermostat. EMER is typically used when
compressor operation is not desired, or you prefer back-up
heat only.
1. Move SYSTEM switch to EMER position. EMER will flash on

the display.

2. Press

to adjust thermostat setting above room tempera-

ture. The Aux heating system will begin to operate. The
Flame icon ( ) will display flashing to indicate that the Aux
system is operating.

3. Press

to adjust the thermostat below room temperature.

The Aux heating system should stop operating.

To prevent compressor and/or property damage, if the
outdoor temperature is below 50

F, DO NOT operate the

cooling system

Cooling System

1. Move SYSTEM switch to COOL position.

2. Press

to adjust thermostat setting below room tempera-

ture. The blower should come on immediately on high speed,
followed by cold air circulation.

4. Press

to adjust temperature setting above room tem-

perature. The cooling system should stop operating.

Before you begin programming your thermostat, you should be
familiar with its features and with the display and the location and
operation of the thermostat buttons. Your thermostat consists of
two parts: the thermostat cover and the base. To remove the
cover, gently pull it straight out from the base. To replace the
cover, line up the cover with the base and press gently until the
cover snaps onto the base.

The Thermostat Buttons and Switches

(Up arrow) Raises temperature setting.

(Down arrow) Lowers temperature setting.

TIME button.

PRGM (program) button.

RUN (program) button.

HOLD button.

FAN switch (ON, AUTO).

SYSTEM switch (COOL, OFF, HEAT).

The Display

Indicates day of the week.

Indicates a malfunction with the system.

CAUTION

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Flame icon ( ) is displayed when the SYSTEM switch is in
the HEAT position. Flame icon ( ) is displayed flashing when
2nd-stage heat (Aux or Emergency) is energized. Snowflake
icon ( ) is displayed (non-flashing) when the SYSTEM
switch is in the COOL position. Snowflake and Flame icon
will be displayed (flashing) if the thermostat is in lockout mode
to prevent the compressor from cycling too quickly.

EMER is displayed flashing when the system switch is in
EMER position.

Alternately displays current time and temperature.

The word HOLD is displayed when the thermostat is in the
HOLD mode.

Displays currently programmed set temperature (this is blank
when SYSTEM switch is in the OFF position).

“BATT” is displayed when 2 “AAA” batteries are low and
should be replaced.

Configuration Menu

The configuration menu allows you to set certain thermostat
operating characteristics to your system or personal requirements.

Press RUN to make sure the thermostat is in the run program
mode, then press PRGM and RUN at the same time to enter the
configuration menu. The display will show the first item in the
configuration menu.

The configuration menu chart summarizes the configuration
options. An explanation of each option follows.

Press HOLD to change to the next menu item or press TIME to go
backwards to the previous item in the menu. To exit the menu and
return to the program operation, press RUN. If no keys are
pressed within fifteen minutes, the thermostat will revert to normal
operation.

1. In the run mode, if the setpoint temperature is manually raised

by 3

F (2

C) or more above the actual temperature with the

TEMPERATURE UP key, and the fast second stage feature is
enabled, FA on, the second stage will energize immediately.
With FA off, second stage will not energize until the setpoint
temperature is 1

F or more above actual temperature for more

than ten minutes.

2. Select Compressor Lockout CL OFF or ON – Selecting CL

ON will cause the thermostat to wait 5 minutes before turning
on the compressor if the heating and cooling system loses
power. It will also wait 5 minutes minimum between cooling

Step

Press Button(s)

Displayed (Factory Default)

Press or to select:

COMMENTS

Returns to normal operation

Select Compressor lockout OFF or ON

Configuration Menu

0 HI

(0)

3 LO TO

3 HI

Select temperature display adjustment higher or lower

PRGM

and RUN

Select Fast (on) or slow (off) Second Stage Heat

(on)

OFF

HOLD*

RUN

(OFF)

* Press

HOLD

to advance to next item or

TIME

to move backwards to previous item

CHECK THERMOSTAT OPERATION

CONTINUED FROM FOURTH PAGE

and heating cycles. This is intended to help protect the
compressor from short cycling. Some newer compressors
already have a time delay built in and do not require this
feature. Your compressor manufacturer can tell you if the
lockout feature is already present in their system. When the
thermostat compressor time delay occurs it will flash the
Snowflake and Flame icons for about five minutes.

3. Select Temperature Display Adjustment 3 LO to 3 HI –

Allows you to adjust the room temperature display up to 3

higher or lower. Your thermostat was accurately calibrated at
the factory but you have the option to change the display
temperature to match your previous thermostat. The current
or adjusted room temperature will be displayed on the left side
of the display.

Operating Features

Now that you are familiar with the thermostat buttons and display,
read the following information to learn about the many features of
the thermostat.

SIMULTANEOUS HEATING/COOLING PROGRAM STOR-
AGE — When programming, you can enter both your heating
and cooling programs at the same time. There is no need to
reprogram the thermostat at the beginning of each season.

TEMPERATURE OVERRIDE — Press

until the

display shows the temperature you want. The thermostat will
override current programming and keep the room tempera-
ture at the selected temperature until the next program period
begins. Then the thermostat will automatically revert to the
program.

HOLD TEMPERATURE — The thermostat can hold any
temperature within its range for an indefinite period, without
reverting to the programmed temperature. Press HOLD
button. HOLD will be displayed. Then choose the desired
temperature by pressing

. The thermostat will

hold the room temperature at the selected setting until you
press the RUN button to start program operation again.

ENERGY MANAGEMENT RECOVERY — Energy Manage-
ment Recovery (EMR) causes the thermostat to start heating
or cooling early to make the building temperature reach the
program setpoint at the time you specify. Heating will start 5
minutes early for every 1

of temperature required to reach

setpoint.

Example: You select EMR and have your heating pro-
grammed to 65

at night and 70

at 7 AM. If the building

temperature is 65

the difference between 65

and 70

is 5

Allowing 5 minutes per degree the thermostat setpoint will
change to 70

at 6:35 AM. Cooling allows more time per

degree because it takes longer to reach temperature.

C CONVERTIBILITY — The factory default setting is

Fahrenheit. Clipping W904 jumper on the circuit board (see
fig. 1) will alter this feature to Celsius temperature setting.

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1ST

2ND

3RD

4TH

1ST

2ND

3RD

4TH

SAMPLE

Heating/Cooling Schedule Plan (Factory Program)

6:00 AM

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

70 F

62 F

70 F

62 F

78 F

85 F

78 F

82 F

70 F

62 F

70 F

62 F

78 F

85 F

78 F

82 F

WEEKDAY (5 DAY)

WEEKEND (2 DAY)

Start

Time

Temperature

Start

Time

Temperature

Period

COOL

HEA

WEEKDAY (5 DAY)

WEEKEND (2 DAY)

Start

Time

Temperature

Start

Time

Temperature

Heating/Cooling Schedule Plan

Period

COOL

1ST

2ND

3RD

4TH

1ST

2ND

3RD

4TH

COOL

HEA

PROGRAMMING YOUR THERMOSTAT

This section will help you plan your

WKHUPRVWDWҋV

program to meet

your needs. For maximum comfort and efficiency, keep the
following guidelines in mind when planning your program.

When heating (cooling) your building, program the tempera-
tures to be cooler (warmer) when the building is vacant or
during periods of low activity.

During early morning hours, the need for cooling is usually
minimal.

Look at the factory preprogrammed times and temperatures shown
below. If this program will suit your needs, simply press the RUN
button to begin running the factory preset program.
If you want to change the preprogrammed times and tempera-
tures, follow these steps.
Determine the time periods and temperatures for your weekday
and weekend programs. You must program four periods for both
the weekday and weekend program. However, you may use the
same heating and cooling temperatures for consecutive time
periods. You can choose start times, heating temperatures, and
cooling temperatures independently for both weekday and week-
end programs (for example, you may select 5:00 AM and 70

the weekday 1st period heating start time and temperature, and
also choose 7:00 AM and 76

as the weekday 1st period cooling

start time and temperature). Use the table at the bottom of the
page to plan your program time periods and the temperatures you
want during each period. You may also want to look at the sample
program table to get an idea of how the thermostat can be
programmed.

Entering Your Program

Follow these steps to enter the heating and cooling programs you
have selected.

Set Current Time and Day

1. Press TIME button once. The display will show the hour only.

EXAMPLE:

2. Press and hold either

until you reach the correct

hour and AM/PM designation (AM begins at midnight; PM
begins at noon).

3. Press TIME once. The display window will show the minutes

only.

EXAMPLE:

4. Press and hold either

until you reach the correct

minutes.

5. Press TIME once. The display will show the day of the week.

6. Press

until you reach the current day of the week.

7. Press RUN once. The display will show the correct time and

room temperature alternately.

Enter Heating Program

1. Move the SYSTEM switch to HEAT.

2. Press PRGM once. “MO TU WE TH FR” (indicating weekday

program) will appear in the display. Also displayed are the
currently programmed start time for the 1st heating period and
the currently programmed temperature (flashing).

EXAMPLE:

MO TU WE TH FR

This display window shows that for the 1st weekday period,
the start time is 6:00 AM, and 70

is the programmed tempera-

ture (this example reflects factory preprogramming).

3. Press

to change the displayed temperature to

your selected temperature for the 1st heating program period.

4. Press TIME once (the programmed time will flash). Press

until your selected time appears. The time will

change in 15 minute increments. When your selected time is
displayed, press TIME again to return to the change tempera-
ture mode.

5. Press PRGM once. The currently programmed start time and

setpoint temperature for the 2nd heating program period will
appear.

6. Repeat steps 4 and 5 to select the start time and heating

temperature for the 2nd heating program period.

7. Repeat steps 4 through 6 for the 3rd and 4th heating program

periods. Weekday heating programs are now complete.

8. Press PRGM once. “SA SU” (indicating weekend program)

will appear in the display, along with the start time for the 1st
heating period and the currently programmed temperature.

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ELECTRICAL DATA

Electrical Rating:

20 to 30 VAC 50/60 Hz.
0.05 to 1.0 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)

SPECIFICATIONS

THERMAL DATA

Setpoint Temperature Range:

F to 90

F (7

C to 32

Operating Ambient Temperature Range:

F to 105

Operating Humidity Range:

0 to 90% RH (non-condensing)

Shipping Temperature Range:

-40

F to 150

PROGRAMMING YOUR THERMOSTAT

CONTINUED FROM SIXTH PAGE

9. Repeat steps 4 through 8 to complete weekend heating

programming.

10. When you have completed entering your heating program,

press RUN.

Enter Cooling Program

If the outside temperature is below 50

F, disconnect power to

the cooling system before programming. Energizing the air
conditioner compressor during cold weather may cause
personal injury or property damage.

1. Move SYSTEM switch to COOL position.

2. Follow the procedure for entering your heating program, using

your selected cooling times and temperatures.

Check Your Programming

Follow these steps to check your thermostat programming one
final time before beginning thermostat operation.
1. Move SYSTEM switch to HEAT position.

2. Press PRGM to view the 1st weekday heating period time and

temperature. Each time you press PRGM, the next heating
period time and temperature will be displayed in sequence for
weekday, then weekend program periods (you may change
any time or temperature during this procedure).

3. Press RUN.

4. Move SYSTEM switch to COOL position.

5. Repeat step 2 to check cooling temperatures.

6. Press RUN to begin program operation.

YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED
AND READY TO AUTOMATICALLY PROVIDE MAXIMUM
COMFORT AND EFFICIENCY!

No Heat/No Cool/No Fan

1. Blown fuse or tripped circuit breaker.

Replace fuse or reset breaker.

(common problems)

2. Furnace power switch to OFF.

Turn switch to ON.

3. Furnace blower compartment door or

Replace door panel in proper position to engage

panel loose or not properly installed.

safety interlock or door switch.

No Heat

2. System Switch not set to HEAT.

Set System Switch to HEAT and raise setpoint
above room temperature.

3. Loose connection to thermostat or system.

Verify thermostat and system wires are securely
attached.

4. Furnace Lock-Out Condition. Heat may also

Many furnaces have safety devices that shut

heat works intermittently contact the furnace
manufacturer or local service person for
assistance.

TROUBLESHOOTING

Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermostat
by pressing

and TIME at the same time. This also

resets the factory defaults. If the thermostat has power, has been

reset and still does not function correctly contact your heating/
cooling service person or place of purchase.

Batteries
For optimum performance, we recommend replacing batteries
once a year with fresh “AAA” Energizer

alkaline batteries.

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No Heat (continued)

5. Heating system requires service or

Diagnostic: Set System Switch to HEAT and raise

thermostat requires replacement.

the setpoint above room temperature. Within a few
seconds the thermostat should make a soft click
sound. This sound usually indicates the thermo-
stat is operating properly. If the thermostat does
not click, try the reset operation listed above. If the
thermostat does not click after being reset contact
your heating and cooling service person or place
of purchase for a replacement. If the thermostat
clicks, contact the furnace manufacturer or a
service person to verify the heating is operating
correctly.

No Cool

1. System Switch not set to COOL.

Set System Switch to COOL and lower setpoint
below room temperature.

2. Loose connection to thermostat or system.

Verify thermostat and system wires are securely
attached.

3. Cooling system requires service or

Same procedure as diagnostic for No Heat

thermostat requires replacement.

condition except set the thermostat to COOL and
lower the setpoint below the room temperature.
There may be up to a five minute delay before the
thermostat clicks in Cooling.

Heat, Cool or Fan Runs Constantly.

1
2. Possible short in thermostat.

shorted or touching together. No bare wire should

3. Possible short in heat/cool/fan system.

stick out from under terminal screws. Try resetting

4. Fan Switch set to Fan On.

the thermostat as described above. If the condition

persists the manufacturer of your system or
service person can instruct you on how to test the
Heat/Cool system for correct operation. If the
system operates correctly, replace the thermostat.

Furnace (Air Conditioning) Cycles Too Fast

1. The location of the thermostat and/or the

Digital thermostats normally provide precise

or Too Slow (narrow or wide temperature

size of the Heating (Cooling) System may

temperature control and may cycle faster than

swing)

be influencing the cycle rate.

some older mechanical models. A faster cycle
rate means the unit turns on and off more
frequently but runs for a shorter time so there is
no increase in energy use. If you would like to
increase the cycle time, clip Jumper W-905 as
mentioned in the instructions for Hydronic Heating
Systems. It is not possible to shorten the cycle
time. If an acceptable cycle rate is not achieved as
received or by clipping W-905 contact a local
service person for additional suggestions.

Thermostat Setting and Thermostat

1. Thermostat thermometer setting requires

The thermometer can be adjusted +/- 3 degrees.

Thermometer Disagree

Operation section.

Thermostat Does Not Follow Program

1. AM or PM set incorrectly in program.

Check current clock and program settings

2. AM or PM set incorrectly on the clock.

including the AM or PM designations for each

3. Voltage spike or static discharge.

time period. If a voltage spike or a static discharge
occurs use the Reset Operation listed above.

Blank Display and/or Keypad

1. Voltage spike or static discharge.

Use the Reset Operation listed above.

Not Responding

TROUBLESHOOTING

CONTINUED FROM SEVENTH PAGE

T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y

ATP21W02

C r e a t e d : 2 1 N o v e m b e r, 2 0 1 4

c l i m a t e m a s t e r. c o m

Notes

C L I M A T E M A S T E R W A T E R - S O U R C E H E A T P U M P S

ATP21W02

C r e a t e d : 2 1 N o v e m b e r, 2 0 1 4

C l i m a t e M a s t e r Wa t e r - S o u rc e H e a t P u m p s

Notes

T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y

ATP21W02

C r e a t e d : 2 1 N o v e m b e r, 2 0 1 4

c l i m a t e m a s t e r. c o m

Notes

C L I M A T E M A S T E R W A T E R - S O U R C E H E A T P U M P S

ATP21W02

C r e a t e d : 2 1 N o v e m b e r, 2 0 1 4

C l i m a t e M a s t e r Wa t e r - S o u rc e H e a t P u m p s

Date:

Item:

Action:

11/21/14

First Published

Revision History

*97B0082N07*

97B0082N07

ClimateMaster works continually to improve its products. As a result, the design and specifi cations of each product at the time of order may be
changed without notice and may not be as described herein. Please contact ClimateMaster’s Customer Service Department at 1-405-745-6000 for
specifi c information on the current design and specifi cations. Statements and other information contained herein are not express warranties and
do not form the basis of any bargain between the parties, but are merely ClimateMaster’s opinion or commendation of its products. For the latest
version of this document go to climatemaster.com.
ClimateMaster is a proud supporter of the Geothermal Exchange Organization - GEO. For more information visit geoexchange.org.

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