Page 1
WHITE-RODGERS
CAUTION
!
WARNING
!
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
This wall-mounted, low voltage thermostat maintains
room temperature by controlling the operation of multistage systems. Use this thermostat for applications
requiring up to three stages of heat and up to two stages
of cool. Indicator lights show the system status. The user
may program up to four time/temperature settings per 24
hour period. The thermostat stores programs for seven
independent days. The thermostat will store both heating
and cooling programs simultaneously. A 9 volt Energizer
battery will maintain the stored program for approximately
one week, if incoming power should fail. If power failure
is extensive and the program is lost, after power restoration, the thermostat will automatically maintain a factory
preprogrammed heating temperature of 64°F or a cooling
temperature of 82°F.
1F94-71
Multi-stage Electronic Digital Thermostat
INSTALLATION INSTRUCTIONS
DESCRIPTION
®
W H I T E - R O D G E R S
DIGITAL COMFORT SET
PRECAUTIONS
II
If in doubt about whether your wiring is millivolt, line, or low
voltage, have it inspected by a qualified heating and air
conditioning contractor, electrician, or someone familiar
with basic electricity and wiring.
Do not exceed the specification ratings.
CONTENTS
Description......................................................... 1
Precautions........................................................ 1
Specifications..................................................... 2
Installation.......................................................... 2
New Installation
Select Thermostat Location
Route Wires to Location
Replacement Installation
Remove Old Thermostat
Attach Subbase to Wall
Attach Thermostat to Subbase
Operation ........................................................... 5
System Configuration
Set Option Switches
Check Thermostat Operation
Fan Operation
Heating System
Cooling System
Troubleshooting
All wiring must conform to local and national electrical
codes and ordinances.
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting components could cause the control to malfunction.
To prevent electrical shock and/or equipment
damage, disconnect electric power to system, at
main fuse or circuit breaker box, until installation
is complete.
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
burn out thermostat and could cause personal
injury and/or property damage.
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
R
Printed in U.S.A.
PART NO. 37-4744B
Replaces 37-4744A
9310
Page 2
SPECIFICATIONS
THIS CONTROL IS DESIGNED FOR USE WHERE BOTH SIDES OF THE TRANSFORMER ARE PRESENT
TO THE THERMOSTAT (both the hot and common sides of the 24vAC end of the transformer.)
ELECTRICAL DATA
Electrical Rating:
20 to 30v AC 50/60 Hz.
0.01 to 1.5 Amps (Load per terminal)
2.5 Amps Maximum Total Load (All terminals
combined)
Anticipation:
Heating 4 to 40
Cooling 4 to 40 Reference Values
Auxiliary 4 to 40
}
STAGING DATA
Up to three heating stages
Up to two cooling stages
INSTALLATION
NEW INSTALLATION
YOU SHOULD PROGRAM THE THERMOSTAT WITH
BATTERY INSTALLED BEFORE ATTACHING ON
SUBBASE. SEE OPERATION GUIDE FOR PROGRAMMING INSTRUCTIONS.
SELECT THERMOSTAT LOCATION
Proper location insures that the thermostat will provide a
comfortable building temperature. Observe the following
general rules when selecting a location:
1. Locate thermostat about 5 ft. above the floor.
2. Install thermostat on a partitioning wall, not on an
outside wall.
3. Never expose thermostat to direct light from lamps,
sun, fireplaces or any temperature radiating equipment.
4. Avoid locations close to windows, adjoining outside
walls, or doors that lead outside.
5. Avoid locations close to air registers or in the direct
path of air from them.
6. Make sure there are no pipes or duct work in that part
of the wall chosen for the thermostat location.
7. Never locate thermostat in a room that normally
warmer or cooler than the rest of the building.
8. Avoid locations with poor air circulation, such as
behind doors or in alcoves.
THERMAL DATA
Setpoint Temperature Range:
40° F to 99°F (4°C to 37° 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
ACCESSORIES
Remote Sense Kit W. R. Part No. F145-1049
Thermostat Guard W. R. Part No. F29-0198 (clear) or
F29-0238 (opaque)
ROUTE WIRES TO LOCATION
All wiring must conform with local and national electrical
codes and ordinances.
1. Probe for obstructions in partition before drilling 1/2"
hole in wall at selected location. Take up quarter
round and drill a small guide hole for sighting (see fig.
1). From basement, drill 3/4" hole in partition floor next
to guide hole. In buildings without basements, drill 1/
2" hole through ceiling and into partition from above
(see fig. 1).
2. Through this hole drop a light chain, or 6" chain
attached to a strong cord. nag cord in basement with
hooked wire. In buildings without basements, drop
cord through hole in ceiling and down partitioning;
snag cord at the thermostat location.
3. Attach thermostat wires to cord and pull wires through
hole in wall so that 6" of wire protrudes.
1/2" hole for
thermostat wire
Stout cord with 6"
chain attached
Approximately
Baseboard
strip moulding
Quarter round
removed
1/4" guide hole
for sighting
5 feet from floor
3/4" hole in floor of partition
Hooked wire for snagging chain
Figure 1. Routing thermostat wires
2
Page 3
REPLACEMENT INSTALLATION
REMOVE OLD THERMOSTAT
1. Shut off electricity at the main fuse box until installation is complete. Verify power is off with a voltmeter.
2. Remove the front cover of the old thermostat. With
wires still attached, remove wall plate from the wall.
3. If the old thermostat has a wall mounting plate,
remove the thermostat and the wall mounting plate as
an assembly.
4. Use the Cross Reference Guide to find the thermostat
type you are replacing.
5. Identify each wire attached to the old thermostat
using the labels enclosed with the new thermostat. Record the identification of the wire on the
corresponding blank in Table 2.
6. Disconnect the wires from old thermostat one at a
time. Pull at least 6 inches of wire out of the wall. DO
NOT LET WIRES FALL BACK INTO THE WALL.
7. Install new thermostat using the following procedures.
PULL STRAIGHT OUT
Figure 2. Removing thermostat from subbase
TABLE 1. WIRE IDENTIFICATION LABELS
1
G
G
1
9
Y1
Y1
9
2
C
C
2
10
Y2
Y2
10
3
L
L
3
11
W1
W1
11
4
R
R
4
12
W2
W2
12
5
O
O
5
13
W3
W3
13
6
B
B
6
14
S1
S1
14
7
E1
E1
7
15
S2
S2
15
8
E2
E2
8
16
S3
S3
16
ATTACH SUBBASE TO WALL
1. Remove the packing material from the thermostat.
Place the fingers of one hand on the center top and
bottom portion of the thermostat. Grasp the subbase
in the other hand on the top and bottom center, and
gently pull straight out (see fig. 2). The thermostat has
pin and socket connectors. Forcing or prying on the
thermostat will cause damage to the unit.
TABLE 2. TERMINAL REFERENCE
LABEL
NUMBER
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8) E2 Emergency Heat Relay (continually
(9)
(10)
(11)
(12)
(13)
NEW THERMOSTAT
TERMINAL
DESIGNATION FUNCTION
G
C
L
R
O
B
E1
Y1
Y2
W1
W2
W3
Fan Output
Transformer 24v AC Common
Malfunction Light
Transformer 24v AC Hot
Changeover Output (cool)
Changeover Output (hot)
Emergency Heat Relay (cycles on first
stage in emergency mode)
energized in emergency mode)
Stage 1 Cool
Stage 2 Cool
Stage 1 Heat (compressor)
Stage 2 Heat (compressor)
Stage 3 Heat (auxiliary)
NOTE
THIS THERMOSTAT REQUIRES BOTH THE HOT AND
COMMON SIDES OF THE 24vAC TRANSFORMER TO
BE PRESENT TO THE THERMOSTAT FOR OPERATION.
OLD THERMOSTAT
TERMINAL
DESIGNATION
3
Page 4
2. Connect wires beneath terminal screws on sub-
CAUTION
!
base using appropriate wiring schematic (see figs.
3 through 6).
3. Place subbase over hole in wall and mark mounting
hole locations on wall using subbase as a template.
4. Move subbase out of the way. Drill mounting holes.
5. Fasten subbase loosely to wall, as shown in fig. 3,
using two mounting screws. Place a level against
bottom of subbase, 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 subbase snugly, use plastic
expansion plugs to secure subbase.
6. Push excess wire into wall and plug hole with a fireresistant material (such as fiberglass insulation) to
prevent drafts from affecting thermostat operation.
WARNING
!
DO NOT EXCEED MAXIMUM VOLTAGE OR CURRENT RATINGS. FIRE, PERSONAL INJURY, AND/
OR EQUIPMENT DAMAGE COULD RESULT.
Expansion
plugs
Mounting
hole
9-pin connector
Pull wires through
this opening
Connect wires under
terminal screws
S3
S2
S1
O
W1
B
E1
Y1
Y2
C
G
4-pin connector
E2
L
R
W2
W3
Figure 3. Subbase
To prevent electrical shock and/or equipment
damage, disconnect electrical power at the main
fuse box until installation is complete. Verify
power is off with a voltmeter.
Mounting
hole
O
Changeover
Energized
In Cool
B
Changeover
Energized
In Heat
The following wiring diagram shows typical terminal identification and wiring. For proper installation, refer to the
original manufacturers' instructions.
Y1 Y2 W1
Compressor
Contactor
Stage 2
Compressor
Contactor
Stage 1
G
Fan
Relay
E2
Emergency
Relay
Constant
Output
E1
Emergency
Relay
Switched
Output
NOTE
Heat
Relay
Stage 1
W2
Heat
Relay
Stage 2
W3
Heat
Relay
Stage 3
Thermostat
Control
Circuit
Malfunction
Light
C R
System
Monitor
Switch
L
24vAC
THERMOSTAT
SYSTEM
Hot
120vAC
Neutral
TRANSFORMER
Figure 4. Typical wiring diagram for single transformer systems
4
Page 5
NOTE
CAUTION
!
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
Neutral
TRANSFORMER
24vAC120vAC
O
Changeover
Energized
In Heat
Changeover
Energized
In Cool
Y1 Y2
B
Compressor
Contactor
Stage 2
Compressor
Contactor
Stage 1
HEAT PUMP SYSTEM
TWO COMMONS MUST
BE JUMPERED TOGETHER!
G
Fan
Relay
W1
Heat
Relay
Stage 1
Figure 5. Typical wiring diagram for two-transformer system with NO safety circuits
NOTE
Relay contacts shown are thermostatically operated. The
accessory relay scheme is required when safety circuits
exist in both systems.
Control
Circuit
C
Malfunction
Light
System
Monitor
Switch
L
Limit or
Safety
Switches
TRANSFORMER
24vAC
DEPENDING ON SYSTEM
E1
Emergency
Emergency
Relay
Switched
Output
Thermostat
E2
W2
W3
Relay
Constant
Output
AUXILIARY HEATING SYSTEM
Heat
Relay
Stage 3
Heat
Relay
Stage 2
REQUIREMENTS, REPLACE
WITH A 75VA TRANSFORMER, IF NEEDED
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.
THERMOSTAT
R
SYSTEM
Hot
120vAC
Neutral
Limit or
Safety
Switches
O
Changeover
Energized
Changeover
Energized
In Cool
Malfunction
Light
C R
System
Monitor
Switch
L
Limit or
Switches
Limit or
Safety
Switches
Safety
24vAC
Accessory
Relay N.O.
Contact
24vAC
24vAC
AUXILIARY
TRANSFORMER
Hot
120vAC
Neutral
HEAT PUMP
TRANSFORMER
HEATING
B
Y1 Y2
Compressor
In Heat
HEAT PUMP SYSTEM
Contactor
Stage 2
Compressor
Contactor
Stage 1
TWO COMMONS MUST
BE JUMPERED TOGETHER!
G
Fan
Relay
W1
Heat
Relay
Stage 1
E2
Relay
Output
W2
Heat
Relay
Stage 3
Heat
Relay
Stage 2
E1
Emergency
Constant
Emergency
Relay
Switched
Output
AUXILIARY HEATING SYSTEM
W3
Thermostat
Control
Circuit
Figure 6. Typical wiring diagram for two-transformer system with safety circuits in BOTH systems
THERMOSTAT
SYSTEM
Limit or
Hot
Switches
120vAC
Neutral
Limit or
Safety
Switches
Safety
5
Page 6
ATTACH THERMOSTAT TO SUBBASE
)
)
)
WE RECOMMEND THAT YOU SET OPTION SWITCHES
TO DESIRED POSITION BEFORE ATTACHING ON
SUBBASE (see OPERATION). WE ALSO RECOMMEND THAT YOU PROGRAM THE THERMOSTAT
WITH BATTERY INSTALLED BEFORE ATTACHING
ON SUBBASE (see OPERATION GUIDE for program-
ming instructions).
POWER TO THERMOSTAT MUST BE OFF BEFORE
ATTACHING THERMOSTAT TO WALL. FAILURE TO
TURN OFF POWER BEFORE ATTACHING THERMOSTAT MAY CAUSE EQUIPMENT DAMAGE DUE TO
RAPID COMPRESSOR CYCLING.
To attach thermostat to subbase, line up the plastic snap
guides at the top of the thermostat and the 4 connector
pins on the thermostat with the connectors near the top
right section of the subbase (when viewed from the front).
Gently pivot the thermostat down until the 9-pin connec-
OPERATION
tors and the plastic snaps lock into place (see fig. 7). Be
gentle when attaching thermostat. If the thermostat
does not seem to be attaching to the subbase easily,
make sure that the connector pins and plastic snaps are
properly aligned, and that excess wire is pushed into the
wall. Damage to the thermostat may occur if force is
used.
ENGAGE TWO UPPER GUIDES;
PIVOT DOWN
Figure 7. Attaching thermostat to subbase
SYSTEM CONFIGURATION
NOTE
ANY TIME OPTION SWITCHES #1, #2, OR #4 ARE
CHANGED, THE 9 VOLT BATTERY MUST BE REMOVED FOR A MINIMUM OF 2 MINUTES. DO NOT
REMOVE THE BATTERY WHEN CHANGING OPTION
SWITCH #3.
SET OPTION SWITCHES
1. Single Stage Compressor Heat Pump System —
with reversing valve energized through B or O terminals
W1 Y1
ON
1234
2. Two Compressor (Split) or Two Speed Compressor System
W1 Y1
W2 Y2
ON
1234
Field jumper W1 & Y1
Switch #1
Switch #2
Switch #3 (see step 5)
Switch #4 (see step 6)
Field jumper W1 & Y1
Field jumper W2 & Y2
Switch #1
Switch #2
Switch #3 (see step 5)
Switch #4 (see step 6
OFF
OFF
OFF
ON
4-pin connector
Battery
Option switches 9-pin connector
Figure 8. Back of thermostat
3. Multi-stage System with Electric Auxiliary Heating System — up to 3 heat stages and 2 cool stages
ON
1234
Switch #1
Switch #2
Switch #3 (see step 5)
Switch #4 (see step 6
ON
ON
4. Multi-stage System — up to 3 heat stages and 2 cool
stages
ON
1234
Switch #1
Switch #2
Switch #3 (see step 5)
Switch #4 (see step 6
ON
OFF
6
Page 7
5. Keypad Lockout
)
CAUTION
!
HEATING SYSTEM
NOTE
Option switches #1, #2, and #4 should be changed (if
required), programming should be completed, and battery should be installed before changing option switch #3.
ON
1234
Switch #1 (see steps 1-4)
Switch #2 (see steps 1-4)
Switch #3
Switch #4 (see step 6
ON
6. Automatic Changeover from Heat to Cool
ON
1234
Switch #1 (see steps 1-4)
Switch #2 (see steps 1-4)
Switch #3 (see step 5)
Switch #4 ON
NOTE
The battery maintains the stored program in the event of
a power failure. When attached to the wall with 24v AC
power applied, the thermostat will function normally without the battery. However, the program will be lost in the
event of a power interruption or failure if the battery is not
installed. When power is restored, the thermostat will
automatically maintain a heating temperature of 64°F or
a cooling temperature of 82°F (factory preprogrammed)
as needed.
CHECK THERMOSTAT OPERATION
NOTE
When checking thermostat, option switch #4 for automatic changeover must be in the OFF position. This will
allow temporary setting of heat setpoints above cool
setpoints. After system checkout, reset option switch #4
to ON position if automatic changeover is desired (see
SET OPTION SWITCHES).
FAN OPERATION
1. Press
SYSTEM
until HEAT is displayed (it may al-
SWITCH
ready be displayed).
2. Press to adjust thermostat to 99°F. All stages of
the heating system should begin to operate within
approximately five minutes. However, if the PUMP
LED is flashing, the compressor lockout feature is
operating (see Lockout Bypass Option to temporarily override the compressor lockout feature during
testing).
COOLING SYSTEM
To prevent compressor and/or property damage,
if power to the compressor has been off or
interrupted for more than 1 hour and the outdoor
temperature is below 50°F, DO NOT operate the
system for at least the amount of time the compressor was off! This will allow the compressor
heaters to warm the compressor oils to avoid
damage due to slugging.
1. Press
2. Press to adjust thermostat to 40°F. All stages of
the cooling system should begin to operate within
approximately five minutes. However, if the PUMP
LED is flashing, the compressor lockout feature is
operating (see Lockout Bypass Option to temporarily override the compressor lockout feature during
testing).
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY. OPERATORS SHOULD NOT USE THIS
FEATURE DUE TO POSSIBILITY OF EQUIPMENT
OR PROPERTY DAMAGE, OR PERSONAL INJURY.
SYSTEM
until COOL is displayed.
SWITCH
LOCKOUT BYPASS OPTION
1. Turn on power to the system. If the auxiliary heat
source has a standing pilot, be sure to light it.
2. Press
FAN
until FAN ON is displayed. The blower
SWITCH
should begin to operate.
3. Press
FAN
until FAN AUTO is displayed. The
SWITCH
blower should stop operating within approximately
one minute.
COMPRESSOR SHORT TERM
CYCLE PROTECTION
This thermostat has a built-in short term (5-minute)
time delay. During this 5-minute period, the thermostat will lock out the compressor to allow head pressure to stabilize. If you want to override this feature
while testing thermostat operation, simply press
VIEW
and
buttons at the same time at initial startup.
TEMP
VIEW
PRGM
DO NOT USE THE LOCKOUT BYPASS OPTION
UNLESS THE COMPRESSOR OIL HEATERS HAVE
BEEN OPERATIONAL FOR 6 HOURS AND THE
SYSTEM HAS NOT BEEN OPERATIONAL FOR AT
LEAST 5 MINUTES.
7
Page 8
EMERGENCY MODE OPERATION
1. Press
EMER LED should be lit continuously (non-flashing),
regardless of system cycling.
2. Press to adjust thermostat about 5°F above
room temperature. Any systems (such as electric
strip heaters, fossil fuel systems, etc.) that are wired
or jumpered to the emergency circuit (thermostat
terminal E1) should begin to cycle.
SYSTEM
until EMER is displayed. The red
SWITCH
If you need further information about this product, please write to
White-Rodgers Division, Emerson Electric Co.
9797 Reavis Road
St. Louis, MO 63123-5398
Attention: Technical Service Department
After the system has been checked and is running properly, determine if automatic changeover is desired (see
SYSTEM CONFIGURATION).
Refer to the OPERATION GUIDE if you need additional
information on thermostat operation.
TROUBLESHOOTING
Refer to the Question & Answer section of the OPERA-
TION GUIDE for information on troubleshooting the ther-
mostat.
WARRANTY INFORMATION
THIS WARRANTY STATEMENT SUPERSEDES ALL WARRANTY
STATEMENTS DATED PRIOR TO OCTOBER 1, 1991.
White-Rodgers Division of Emerson Electric Co. (“Seller”) warrants that its products purchased for resale (the “Products”) will be
free from defects in material and workmanship under normal use
and service for a period of twelve (12) months from date of
installation. Seller’s obligation under this warranty, and Purchaser’s
exclusive remedy for the breach thereof, shall be limited to, at
Seller’s option, Seller’s replacement of any defective Product
F.O.B. Seller’s factory (excluding the cost of labor and any other
expenses incurred in servicing the unit on which the Product is
installed), or Seller’s issuance of a credit in the amount of the
purchase price of such Product for resale as described below.
Seller shall have the option of requiring the return of any defective
Product, transportation charges prepaid, before recognizing any
claim. This warranty shall not apply to any Product (1) which has
been repaired or altered outside Seller’s factory by other than
Seller in any manner so as, in Seller’s judgment, to affect its
serviceability or proper operation; (2) which has been subjected by
persons other than Seller to improper handling, operation, maintenance, repair or alteration; or (3) which has been subjected to
misuse, negligence, or accident.
WARRANTY INFORMATION FOR CONSUMERS
When you purchase a White-Rodgers Division product, it is typically for replacement of a device which has failed on existing
residential or commercial equipment, or a component of new
equipment purchased for modernization.
This warranty extends only to persons or organizations who
purchase the Products for resale. THE FOREGOING CONSTITUTES SELLER’S SOLE RESPONSIBILITY UNDER THIS WARRANTY, AND PURCHASER’S EXCLUSIVE REMEDY FOR THE
BREACH THEREOF. EXCEPT AS OTHERWISE EXPRESSLY
SET FORTH IN THIS AGREEMENT, THERE ARE NO OTHER
WARRANTIES, EXPRESS OR IMPLIED, WHETHER OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
OTHERWISE. SELLER SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER IN CONNECTION WITH THE
SALE, RESALE OR USE OF THE PRODUCTS.
Complete warranty information and instructions for replacing/
returning warranty products can be found in the White-Rodgers
Product Catalog, or by telephoning or writing to:
White-Rodgers Division
Emerson Electric Co.
9797 Reavis Road
St. Louis, Missouri 63123-5398
(314) 577-1300
While our warranty does not extend to you, your contractor or
dealer is protected by a one-year product warranty from WhiteRodgers. Your supplier can rely on a nearby White-Rodgers
wholesaler for prompt credit or replacement.
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