White Rodgers 1F92-71 User manual

PART NO. 37-4742B
Replaces 37-4742A
9309
Operator: Save these instructions for future use!
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398 Printed in U.S.A.
WHITE-RODGERS INSTALLATION INSTRUCTIONS
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
R
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 ........................................................... 6
System Configuration
Set Option Switches
Check Thermostat Operation
Fan Operation
Heating System
Cooling System
Troubleshooting
This wall-mounted, low voltage thermostat maintains
room temperature by controlling the operation of heat
pumps and multi-stage systems. Use this thermostat for
applicationsrequiringuptothreestagesofheatandupto
two stages of cool. Indicator lights show the system
status.Theusermayprogramuptofourtime/temperature
settings per 24 hour period. The thermostat stores set-
tings for a five-day (weekday) program and a two-day
(weekend) program. The thermostat will store both heat-
ing and cooling programs simultaneously. A 9 volt Ener-
gizer®batterywillmaintainthestoredprogramforapproxi-
mately 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
factorypreprogrammedheatingtemperatureof64°F or a
cooling temperature of 82°F.
DESCRIPTION
PRECAUTIONS
Ifindoubtaboutwhetheryourwiringismillivolt,line,orlow
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.
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 compo-
nents could cause the control to malfunction.
To prevent electrical shock and/or equipment
damage,disconnectelectricpowertosystem,at
main fuse or circuit breaker box, until installa-
tion is complete.
Do not use on circuits exceeding specified volt-
age. Higher voltage will damage control and
could cause shock or fire hazard.
Do not short out terminals on gas valve or pri-
mary control to test. Short or incorrect wiring
will damage thermostat and could cause per-
sonal injury and/or property damage.
CAUTION
!
WARNING
!
W H I T E - R O D G E R S
DIGITAL COMFORT SET II
1F92-71
Multi-stage/Heat Pump Electronic Digital Thermostat

2
SPECIFICATIONS
Anticipation:
Heating 4 to 40
Cooling 4 to 40
Auxiliary 4 to 40
THERMAL DATA
Temperature Range: 40°F to 99°F (4°C to 37°C)
STAGING DATA
Up to 3 heating stages
Up to 2 cooling stages
ACCESSORIES
Remote Sense Kit: W. R. Part No. F145-1049
Thermostat Guard: W. R. Part No. F29-0198 (clear)
or F29-0238 (opaque)
}Reference Values
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 30vAC 50/60 Hz.
0.01 to 1.5 Amps (Load per terminal)
2.5 Amps Maximum Total Load (All terminals com-
bined)
DONOTEXCEEDMAXIMUMVOLTAGEORCUR-
RENTRATINGS. FIRE,PERSONALINJURY,AND/
OR EQUIPMENT DAMAGE COULD RESULT.
WARNING
!
INSTALLATION
NEW INSTALLATION
IT IS RECOMMENDED THAT YOU PROGRAM THE
THERMOSTATWITHBATTERYINSTALLEDBEFORE
ATTACHINGONSUBBASE. SEEOPERATIONGUIDE
FORPROGRAMMINGINSTRUCTIONS.SELECTTHER-
MOSTAT LOCATION.
Proper location insures that the thermostat will provide a
comfortablebuilding temperature. Observethefollowing
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 equip-
ment.
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. Makesurethere areno pipesorductworkin thatpart
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.
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
roundanddrillasmallguideholeforsighting(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. Snag cord in basement
with hooked wire. In buildings without basements,
drop cord through hole in ceiling and down partition-
ing; snag cord at the thermostat location.
3. Attachthermostatwirestocordandpullwiresthrough
hole in wall so that 6" of wire protrudes.
Approximately
5 feet from floor
1/2" hole for
thermostat wire
Stout cord with 6"
chain attached
Baseboard
strip moulding
1/4" guide hole
for sighting
Quarter round
removed
3/4" hole in floor of partition
Hooked wire for snagging chain
Figure 1. Routing thermostat wires

3
REPLACEMENT INSTALLATION
REMOVE OLD THERMOSTAT
1. Shut off electricity at the main fuse box until installa-
tion is complete. Verify power is off with a voltmeter.
2. Remove the front cover of the old thermostat. With
wiresstillattached, removewallplatefrom thewall.
3. If the old thermostat has a wall mounting plate,
removethethermostatandthewallmountingplateas
an assembly.
4. UsetheCrossReferenceGuidetofindthethermostat
type you are replacing.
5. Identify each wire attached to the old thermostat
using the labels enclosed with the new thermo-
stat(seeTable1). Recordtheidentificationofthe
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.
DONOTLETWIRESFALLBACKINTOTHEWALL.
7. Install new thermostat using the following proce-
dures.
ATTACH SUBBASE TO WALL
1. Remove the packing material from the thermostat.
Place the fingers of one hand on the center top and
bottomportionofthe thermostat. Graspthe subbase
in the other hand on the top and bottom center, and
gentlypullstraightout(seefig.2). Thethermostathas
pin and socket connectors. Forcing or prying on the
thermostat will cause damage to the unit.
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
3
L
L
3
4
R
R
4
5
O
O
5
6
B
B
6
7
E1
E1
7
8
E2
E2
8
10
Y2
Y2
10
11
W1
W1
11
12
W2
W2
12
13
W3
W3
13
14
S1
S1
14
15
S2
S2
15
16
S3
S3
16
NOTE
THISTHERMOSTAT REQUIRES BOTHTHEHOT AND
COMMON SIDES OF THE 24vAC TRANSFORMER TO
BE PRESENT TO THE THERMOSTAT FOR OPERA-
TION.
TABLE 2. TERMINAL REFERENCE
LABEL
NUMBER
NEW THERMOSTAT
TERMINAL
DESIGNATION FUNCTION
OLD THERMOSTAT
TERMINAL
DESIGNATION
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
G
C
R
Y1
W1
Fan Output
Transformer 24vAC Common
Transformer 24vAC Hot
Stage 1 Cool
Stage1 Heat (Compressor)
L
O
B
E1
E2
Y2
W2
W3
Malfunction Light
Changeover Output (Cooling)
Changeover Output (Heating)
Emergency Heat Relay (cycles on 1st
stage in Emergency Mode)
Emergency Heat Relay (continually
energized in Emergency Mode)
Stage 2 Cool
Stage 2 Heat (Auxiliary)
Stage 3 Heat (Auxiliary)

4
2. Connect wires beneath terminal screws on subbase
using wiring schematic for your particular application
(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
bottomofsubbase,adjustuntillevel,andthentighten
screws. (Leveling is for appearance only and will not
affectthermostatoperation.) Ifyouareusingexisting
mountingholes,orifholesdrilledaretoolargeanddo
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 fire-
resistant material (such as fiberglass insulation) to
prevent drafts from affecting thermostat operation.
Mounting
hole
Pull wires through
this opening
Connect wires under
terminal screws
Mounting
hole
4-pin connector
8-pin connector
Y1
C
G
W1
R
Expansion
plugs
Figure 3. Subbase
S1 S2 S3
O
B
Y2
W2
W3
E1
E2
L
DONOTEXCEEDMAXIMUMVOLTAGEORCUR-
RENTRATINGS. FIRE,PERSONALINJURY,AND/
OR EQUIPMENT DAMAGE COULD RESULT.
WARNING
!
CAUTION
!
To prevent electrical shock and/or equipment
damage,disconnect electrical power at themain
fuse box until installation is complete. Verify
power is off with a voltmeter.
The following wiring diagrams show typical terminal
identification and wiring. For proper installation, refer to
the original manufacturers' instructions.
NOTE
L
C R
B
O
Changeover
Energized
In Heat
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
Fan
Relay
Heat
Relay
Stage 1
Heat
Relay
Stage 2
Heat
Relay
Stage 3
Thermostat
Control
Circuit
Compressor
Contactor
Stage 2
24vAC 120vAC
Hot
Neutral
THERMOSTAT
SYSTEM
Y1 Y2 W1 W2 W3
E1
Emergency
Relay
Constant
Output
E2
Emergency
Relay
Switched
Output TRANSFORMER
Malfunction
Light
System
Monitor
Switch
Figure 4. Typical wiring diagram for single transformer systems
G

5
IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE
SYSTEMS, REMOVE THE TRANSFORMER OF THE
SYSTEM WITH NO SAFETY CIRCUITS.
NOTE
Limit or
Safety
Switches
Heat
Relay
Stage 1
Figure 5. Typical wiring diagram for two-transformer system with NO safety circuits
DEPENDING ON SYSTEM
REQUIREMENTS, REPLACE
WITH A 75VA TRANS-
FORMER, IF NEEDED
TWO COMMONS MUST
BE JUMPERED TOGETHER!
CUT AND
TAPE OFF!
CR
G
B
O
Changeover
Energized
In Heat
Changeover
Energized
In Cool
Thermostat
Control
Circuit
24vAC 120vAC
Hot
Neutral
THERMOSTAT
SYSTEM
Y1 Y2 W2 W3
E1 E2
TRANSFORMER
Malfunction
Light
System
Monitor
Switch
L
HEAT PUMP SYSTEM AUXILIARY HEATING SYSTEM
W1
Limit or
Safety
Switches
24vAC120vAC
Hot
Neutral
TRANSFORMER
Compressor
Contactor
Stage 1
Compressor
Contactor
Stage 2
Fan
Relay
Emergency
Relay
Switched
Output
Emergency
Relay
Constant
Output
Heat
Relay
Stage 2
Heat
Relay
Stage 3
Relaycontactsshownarethermostaticallyoperated. The
accessory relay scheme is required when safety circuits
exist in both systems.
Polaritymustbe observed. If theHOT side ofthe
secondtransformerisjumperedtotheCOMMON
side of the first transformer a short will be made.
Damage to equipment will occur when power is
restored.
CAUTION
!
NOTE
Limit or
Safety
Switches
Limit or
Safety
Switches
Limit or
Safety
Switches
Figure 6. Typical wiring diagram for two-transformer system with safety circuits in BOTH systems
TWO COMMONS MUST
BE JUMPERED TOGETHER!
C R
G
B
O
Changeover
Energized
In Heat
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
Fan
Relay
Heat
Relay
Stage 2
Heat
Relay
Stage 3
Compressor
Contactor
Stage 2
24vAC 120vAC
Hot
Neutral
THERMOSTAT
SYSTEM
Y1 Y2 W2 W3
E1
Emergency
Relay
Constant
Output
E2
Emergency
Relay
Switched
Output
HEAT PUMP
TRANSFORMER
Malfunction
Light
System
Monitor
Switch
HEAT PUMP SYSTEM AUXILIARY HEATING SYSTEM
W1
24vAC 120vAC
Hot
Neutral
AUXILIARY
HEATING
TRANSFORMER
Limit or
Safety
Switches
24vAC
Accessory
Relay N.O.
Contact
Thermostat
Control
Circuit
L
Heat
Relay
Stage 1

6
ATTACH THERMOSTAT TO SUBBASE
IT IS RECOMMENDED THAT YOU SET OPTION
SWITCHESTODESIREDPOSITIONBEFOREATTACH-
ING ON SUBBASE (see OPERATION). IT IS ALSO
RECOMMENDED THAT YOU PROGRAM THE
THERMOSTATWITHBATTERYINSTALLEDBEFORE
ATTACHING ON SUBBASE (see OPERATION GUIDE
for programming instructions).
POWER TO THERMOSTAT MUST BE OFF BEFORE
ATTACHING THERMOSTAT TO WALL. FAILURE TO
TURN OFF POWER BEFORE ATTACHING THERMO-
STAT 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
rightsectionofthesubbase(whenviewedfromthefront).
Gently pivot the thermostat down until the 8-pin connec-
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.
OPERATION
SYSTEM CONFIGURATION
ANY TIME AN OPTION SWITCH IS CHANGED, THE 9
VOLT ENERGIZER®BATTERY MUST BE REMOVED
FOR A MINIMUM OF 2 MINUTES.
SET OPTION SWITCHES
1. Single Stage Compressor Heat Pump — with re-
versing valve energized through Bor Oterminals
2. Two Compressor (Split) System
Figure 8. Back of thermostat body
Option switches 9-pin connector
4-pin connector Battery
W18
ENGAGE TWO UPPER GUIDES;
PIVOT DOWN
Figure 7. Attaching thermostat to subbase
NOTE
ON
1234
Switch #1
Switch #2
Switch #3
Switch #4 (see step 6)
OFF
OFF
OFF
W1 Y1 Field jumper W1 & Y1
ON
1234
Switch #1
Switch #2
Switch #3
Switch #4
(
see step 6
)
OFF
ON
OFF
W1 Y1 Field jumper W1 & Y1
W2 Y2 Field jumper W2 & Y2
3. Multi-stage (Fossil Fuel) System — up to 3 heat
stages and 2 cool stages
4. Multi-stage (Electric Heat) System — up to 3 heat
stages and 2 cool stages
ON
1234
Switch #1
Switch #2
Switch #3
Switch #4
(
see step 6
)
ON
OFF
OFF
ON
1234
Switch #1
Switch #2
Switch #3 (see step 5)
Switch #4
(
see step 6
)
ON
ON

7
5. Economizer — 1st stage cooling
6. Automatic Changeover from Heat to Cool
The battery maintains the stored program in the event of
a power failure. When attached to the wall with 24vAC
powerapplied, the thermostat will function normally with-
out the battery. However, the program will be lost in the
event of power interruption or failure if the battery is not
installed. When power is restored, the thermostat will
automaticallymaintainatemperatureof64°Foracooling
temperatureof82°F(factorypreprogrammed)asneeded.
CHECK THERMOSTAT OPERATION
When checking thermostat, option switch #4 for auto-
matic changeover must be in the OFF position. This will
allow temporary setting of heat set points above cool
settings. Aftersystemcheckout,resetoptionswitchtoON
position if automatic changeover is desired (see SET
OPTION SWITCHES).
FAN OPERATION
1. Turn on power to the system. If the auxiliary heat
source has a standing pilot, be sure to light it.
2. Press
FAN
SWITCH
until FAN isdisplayed. The blower
should begin to operate.
3. Press
FAN
SWITCH
until FAN isdisplayed. The blower
should stop operating within approximately one
minute.
HEATING SYSTEM
1. Press
SYSTEM
SWITCH
until HEAT is displayed. (It may
already be displayed.)
LOCKOUT BYPASS OPTION
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY. OPERATORS SHOULD NOT USE THIS
FEATURE DUE TO POSSIBILITY OF EQUIPMENT
ORPROPERTYDAMAGE,ORPERSONALINJURY.
DO NOT USE THE LOCKOUT BYPASS OPTION
UNLESSTHECOMPRESSOROILHEATERSHAVE
BEEN OPERATIONAL FOR 6 HOURS AND THE
SYSTEMHASNOTBEEN OPERATIONAL FOR AT
LEAST 5 MINUTES.
COMPRESSOR LONG TERM CYCLE
PROTECTION
Toprotectthecompressorfrompotentialdamagedue
to temperature change of crankcase oil, this thermo-
stat has a built-in time delay of one hour less than the
power loss to the unit (up to 12 hours maximum
lockout). During this time, auxiliary heat will be used
when necessary to maintain setpoint temperature.
DO NOT attempttooverridethisdelayfeaturebefore
crankcasetemperaturehasstabilized(for example,if
power has been out for three hours, the compressor
should remain locked out for two hours).
COMPRESSOR SHORT TERM CYCLE
PROTECTION
This thermostat has a built-in short term (5-minute)
time delay. During this 5-minute period, the thermo-
stat will lock out the compressor to allow head pres-
sure to stabilize. If you want to override this feature
whiletestingthermostatoperation, simplypress
ADV
PRGM
and
HOLD
TEMP
at the same time at initial startup.
ON
1234
Switch #1 (see steps 1-4)
Switch #2 (see steps 1-4)
Switch #3
Switch #4
(
see step 6
)
ON
W1 Y2
When using economizer with
single stage heat pump, field
jumper W1 & Y2
ON
1234
Switch #1 (see steps 1-4)
Switch #2 (see steps 1-4)
Switch #3 (see step 5)
Switch #4 ON
NOTE
NOTE
CAUTION
!
2. Press to adjust thermostat to 99°F. All stages
oftheheatingsystemshouldcomeonwithinapproxi-
mately five minutes. However, if the PUMP LED is
flashing, the compressor lockout feature is operating
(see Lockout Bypass Option to temporarily over-
ride the compressor lockout feature during testing).
3. Press
SYSTEM
SWITCH
until EMER is displayed. Repeat step
2.
4. Toprogramthethermostat,seeOPERATIONGUIDE.
(Instructions continue on next page)

COOLING SYSTEM
Topreventcompressorand/orpropertydamage,
if power to the compressor has been off or
interruptedformore than 1hourand the outdoor
temperature is below 50°F, DO NOT operate the
system for at least the amount of time the com-
pressor was off! This will allow the compressor
heaters to warm the compressor oils to avoid
damage due to slugging.
1. Press
SYSTEM
SWITCH until COOL is displayed.
2. Press to adjust thermostat to 40°F. All stages
ofthecoolingsystem shouldcome onwithin approxi-
mately five minutes. However, if the compressor
lockout feature is operating, the fan will run but the
compressor will not operate (see Lockout Bypass
Option to temporarily override the compressor lock-
out feature during testing).
3. Toprogramthethermostat,seeOPERATIONGUIDE.
CAUTION
!
Afterheatingandcoolingsystemhavebeencheckedand
are running properly, determine if automatic changeover
isdesired. Whenoptionswitch#4isintheproperposition,
automatic changeover is enabled by pressing the SYS-
TEMSWITCHuntilAUTOisdisplayed(seeSETOPTION
SWITCHES).
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.
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