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CONTENTS
Installation Instructions for
Heating & Air Conditioning
Model 500
Non- Programmable
Heat Pump Thermostat
Y OUR THERMOST A T REPLACES
Description
Heat Pump (No Aux or Emergency Heat) Yes
Heat Pump (with Aux or Emergency Heat) Yes
Standard Heat & Cooling Systems No
Standard Heat Only Systems No
Millivolt Heat Only Systems – Floor or Wall Furnaces No
Standard Central Air Conditioning No
Gas or Oil Heat No
Electric Furnace No
Hydronic (Hot Water) Zone Heat – 2 Wires No
Hydronic (Hot Water) Zone Heat – 3 Wires No
Preparations.................................................. 1
Thermostat Details ........................................ 1
Removing Old Thermostat .........................1-2
Mounting and Wiring ..................................2-3
Check Thermostat Operation ..................... 4-5
Specifications ................................................ 5
Troubleshooting .........................................5-6
PREPARATIONS
1
Assemble tools required as shown below.
FLAT BLADE SCREWDRIVER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—
THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY
Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage.
WIRE CUTTER/STRIPPER
THERMOSTAT DETAILS
2
hole
W904
Clip for
Celsius
W905
Clip for
Slow Cycle
Figure 1. Thermostat base
Mounting
Mounting
hole
Terminal
Switches
Selection
W906 for Emergency
Heat Second Stage
Fan Control
O/B
REMOVING OLD THERMOSTAT
3
CAUTION
!
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.
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 using the
labels enclosed with the new 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.
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
www.white-rodgers.com
Printed in U.S.A.
PART NO. 37-6398C
Replaces 37-6398B
0341
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REMOVING OLD THERMOSTAT
3
CONTINUED FROM FIRST PAGE
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.
MOUNTING AND WIRING
4
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 the NEC code.
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.
CAUTION
!
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.
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 appropriate 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 appearance 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 configuration menu selections 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 replace 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.
°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.
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.
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MOUNTING AND WIRING
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Changeover
Relay*
* 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
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
SYSTEM
MONITOR
SWITCH
L
24 VAC
TRANSFORMER
Compressor
Contactor
G W2
Fan
Relay
Aux
Relay
(Stage 2)
See Note **
Emergency
E
Relay
CYO/B
Figure 2. Typical wiring diagram for single transformer systems
THERMOSTAT
R
(Class II)
SYSTEM
Hot
120 VAC
Neutral
If safety circuits are in only one of the systems, remove
the transformer of the system with NO safety circuits.
CUT AND
TAPE OFF!
HOT
120 VAC
NEUTRAL
* 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
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
24 VAC
Changeover
Relay*
Compressor
Contactor
G W2
Fan
Relay
Figure 3. Typical wiring diagram for two transformer systems with NO safety circuits
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.
G W2
Changeover
Relay*
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
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
Fan
Relay
Aux
Relay
(Stage 2)
E
CYO/B
See Note **
Emergency
Relay
TWO COMMONS MUST
BE JUMPERED TOGETHER!
SYSTEM
MONITOR
SWITCH
Figure 4. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems
NOTE
See Note **
Emergency
Aux
Relay
(Stage 2)
Relay
TWO COMMONS MUST
BE JUMPERED TOGETHER!
NOTE
L
R
COMMON
E
Limit or
Switches
Limit or
Safety
Switches
CYO/B
SYSTEM
MONITOR
SWITCH
THERMOSTAT
Safety
24 VAC
24 VAC
ACCESSORY
RELAY N.O.
CONTACT
COMMON
24 VAC 120 VAC
Heat Pump Transformer
(Class II)
L
Limit or
Switches
SYSTEM
Auxiliary
Heating
Transformer
(Class II)
THERMOSTAT
R
SYSTEM
Safety
(Class II)
Limit or
Safety
Switches
NOTE
HOT
NEUTRAL
Hot
120 VAC
Neutral
HOT
NEUTRAL
24 VAC
TRANSFORMER
120 VAC
The accessory relay scheme
is required when safety
circuits exist in both systems.
Limit or
Safety
Switches
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CHECK THERMOST A T OPERA TION
5
NOTE
To prevent static discharge problems, touch side of thermostat 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.
CAUTION
!
Do not allow the compressor to run unless the compressor oil heaters have been operational for 6 hours and the
system has not been operational for at least 5 minutes.
Cooling System
1. Move SYSTEM switch to COOL position.
2. Press to adjust thermostat setting below room temperature. The blower should come on immediately on high speed,
followed by cold air circulation.
3. Press to adjust temperature setting above room temperature. 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
1
(Up arrow) Raises temperature setting.
(Down arrow) Lowers temperature setting.
2
3
FAN switch (ON, AUTO).
SYSTEM switch (COOL, OFF, HEAT, EMER).
4
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 3.)
3. Adjust temperature setting to 4° above room temperature. The
auxiliary heat system should begin to operate and the Flame
) will be flashing.
icon (
4. Press to adjust thermostat setting below room temperature. 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 temperature. 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.
The Display
5
Indicates a malfunction with the system.
6
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. Snow-
flake icon (
switch is in the COOL position. Snowflake and Flame icons
are displayed (flashing) if the thermostat is in lockout mode
to prevent the compressor from cycling too quickly.
7
EMER is displayed flashing when the system switch is in
EMER position.
Displays current temperature.
8
) is displayed (non-flashing) when the SYSTEM
CAUTION
!
To prevent compressor and/or property damage, if the
outdoor temperature is below 50
cooling system
°F, DO NOT operate the
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CHECK THERMOST A T OPERA TION
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9
Displays currently programmed set temperature (this is blank
when SYSTEM switch is in the OFF position).
10
“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.
To enter the configuration menu, with SYSTEM switch in OFF
position, hold and for at least two seconds. To exit the
configuration menu, move the SYSTEM switch from the OFF
position.
2. In the run mode, if the setpoint temperature is
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.
3. 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 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.
4. 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.
manually raised
Configuration Menu
Step Press Button(s) Displayed Press or
1
2
3
4
5*
6
* Not available on earlier models
5. Select Backlit Display – (Not available on earlier models) The
display backlight improves display contrast in low lighting
conditions. Selecting backlight ON will keep the light on
continuously. Selecting Backlight OFF will keep the light off.
SPECIFICATIONS
6
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)
THERMAL DATA
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range:
32°F to 105°F
Operating Humidity Range:
0 to 90% RH (non-condensing)
Shipping Temperature Range:
-40°F to 150°F
Set SYSTEM
switch to OFF
and
for at least 2 seconds
and
momentarily
and
momentarily
and
momentarily
Move SYSTEM
switch from OFF
(Factory Default) to select:
FA
(ON)
CL
(OFF)
0 HI
(0)
dL
(ON)
Return to normal operation
OFF
ON
3 LO TO
3 HI
OFF
TROUBLESHOOTING
7
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 at the same time when system is
switched from “OFF” to “HEAT” position. 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
Symptom Possible Cause Corrective Action
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.
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®
alkaline batteries.
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TROUBLESHOOTING
7
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Symptom Possible Cause Corrective Action
No Heat 1. Pilot light not lit. Re-light pilot.
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
be intermittent. down when a lock-out condition occurs. If the
heat works intermittently contact the furnace
manufacturer or local service person for
assistance.
5. Heating system requires service or Diagnostic: Set System Switch to HEAT and raise
thermostat requires replacement.
No Cool 1. System Switch not set to COOL. Set System Switch to COOL and lower setpoint
2. Loose connection to thermostat or system. Verify thermostat and system wires are securely
3. Cooling system requires service or Same procedure as diagnostic for No Heat
thermostat requires replacement. condition except set the thermostat to COOL and
Heat, Cool or Fan Runs Constantly . 1. Possible short in wiring. Check each wire connection to verify they are not
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
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
Thermostat Setting and Thermostat 1. Thermostat thermometer setting requires The thermometer can be adjusted +/- 3 degrees.
Thermometer Disagree adjustment. See Temperature Display Adjustment in the
Blank Display and/or Keypad Not 1. Voltage spike or static discharge. Use the Reset Operation listed above.
Responding
the setpoint above room temperature. Within a few
seconds the thermostat should make a soft click
sound. This sound usually indicates the thermostat 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.
below room temperature.
attached.
lower the setpoint below the room temperature.
There may be up to a five minute delay before the
thermostat clicks in Cooling.
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.
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.
Operation section.
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