White Rodgers 1D56 User manual

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, disconnect electric power to system at
main fuse or circuit breaker box until installation
is complete.
Do not short out terminals on gas valve or pri-
marycontroltotest.Shortorincorrectwiringwill
burn out heat anticipator and could cause per-
sonal injury and/or property damage.
Donotuseoncircuitsexceeding30volts.Higher
voltage will damage control and could cause
shock or fire hazard.
CONTENTS
Description............................................................ 1
Precautions........................................................... 1
Specifications........................................................ 2
Installation............................................................. 2
Select Thermostat Location
Route Wires to Location
Attach Subbase to Wall
Special System Configurations
Electric Heat Furnaces (Single Transformer
Systems Only)
Two-Transformer Systems
Heat Pump Applications
Special Application Terminals
Attach Thermostat to Subbase
Operation & Maintenance ..................................... 5
Adjusting Heat Anticipator
Calibrating Thermostat
Printed in U.S.A. PART NO. 37-4348E
Replaces 37-4348D
9716
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
These low voltage thermostats are designed to provide
convenient control of the heating/cooling system. To
providegreaterroomcomfort,thesensitivespiralbimetal
is combined with an adjustable heating anticipator and a
fixed cooling anticipator to provide maximum comfort.
1D56 and 1F56
Low Voltage Heating/Cooling Thermostat
INSTALLATION INSTRUCTIONS
WHITE-RODGERS
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
Operator: Save these instructions for future use!
PRECAUTIONS
If in doubt about whether your wiring is millivolt, line, or
low voltage, have it inspected by a qualified heating and
airconditioningcontractor,electrician,orsomeonefamil-
iar with basic electricity and wiring.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical
codes and ordinances.
CAUTION
!
WARNING
!

2
NOTE
SPECIFICATIONS
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
ELECTRICAL DATA
Switch Rating: 24 VAC (30 VAC max.)
Heating - 0.15 to 1.2 Amps
Cooling - 0 to 1.5 Amps
Switch Action: Open contact (1D56)
Sealed mercury switch (1F56)
Anticipator Rating:
Heating - Adjustable from 0.15 to 1.2 Amps
Cooling - Fixed 24 VAC
THERMAL DATA
Temperature Range: 50°F to 90°F (10°C to 32°C)
Differential: 1°F
APPLICATIONS
The 1D56 and 1F56 are designed for use with
• Standard heating and cooling systems
• Electric heating and cooling systems
• Single stage heat pump systems
• Two-transformer systems
• Electronic air cleaners
• Humidifiers
• Zone dampers
This thermostat CANNOT BE USED with:
• Millivolt systems
• Multi-stage applications
INSTALLATION
SELECT THERMOSTAT LOCATION
Properlocation insuresthat thethermostat willprovide a
comfortable home 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 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. Makesuretherearenopipesorductworkinthatpart
of the wall chosen for the thermostat location.
7. Never locate thermostat in a room that is warmer or
coolerthantherestofthehome,suchasthekitchen.
8. Avoid locations with poor air circulation, such as
behind doors or in alcoves.
9. Theliving or diningroomisnormallyagoodlocation,
provided there is no cooking range or refrigerator on
opposite side of wall.
ROUTE WIRES TO LOCATION
All wiring must conform with local and national electrical
codes and ordinances.
1. Ifanoldthermostatbeingreplacedisinasatisfactory
location, and the wiring appears to be in good condi-
tion, use existing wiring. If in doubt, re-wire.
2. If a new location is chosen or if this is a new installa-
tion,thermostatwiringmustfirstberuntothelocation
selected.
3. Probe for obstructions in partition before drilling 1⁄2”
hole in wall at selected location. Take up quarter
roundanddrillasmallguideholeforsighting(seefig.
1).Frombasement,drill3⁄4”holeinpartitionfloornext
to guide hole. In houses without basements, drill 1⁄2”
hole through ceiling and into partition from above
(see fig. 1).
4. Through this hole drop a light chain, or 6” chain
attached to a strong cord. Snag cord in basement
withhookedwire.Inhouseswithoutbasements,drop
cord through hole in ceiling and down partitioning;
snag cord at the thermostat location.
5. Attach thermostat wires to cord and pull thermostat
wiresthroughholeinwallsothat6”ofwireprotrudes.

3
NOTE
NOTE
CAUTION
!
CAUTION
!
ATTACH SUBBASE TO WALL
To prevent electrical shock and/or equipment
damage, disconnect electric power to system at
main fuse or circuit breaker box until installation
is complete.
1. Disconnect electrical power at main fuse or circuit
breaker.
2. Pull wires through opening near center of subbase
andconnectwiresbeneathterminalscrews(seefigs.
2 through 6 for typical wiring for each application.
Also refer to subsections below for special system
configurations).
3. Push excess wiring into wall and plug hole with fire-
resistant material (such as fiberglass insulation) to
prevent drafts from affecting thermostat operation.
4. Position subbase over hole in wall and mark mount-
ing hole locations on wall.
5. Drill mounting holes.
6. Fastensubbase loosely to wall,as shown, usingtwo
mounting screws. Place a level against bottom of
subbase, adjust until level, and then tighten mount-
ingscrewstosecuresubbase.Ifholesinwallaretoo
largeanddonotallowyoutotightensubbasesnugly,
use plastic screw anchors to secure subbase.
SPECIAL SYSTEM CONFIGURATIONS
Electric Heat Furnaces (Single Transformer Systems
Only)
The subbase as shipped may not operate the fan cor-
rectly. If both the heating and cooling system must
operatethefanrelay,removetheyellowfactory-installed
jumper wire from the Yterminal and connect it to the A
terminal. The fan should now cycle when the thermostat
calls for either heat or cool.
Two-Transformer Systems
If two transformers are used, they MUST be in
phase. Failure to do so may result in personal
injury and/or property damage.
Wire color DOES NOT indicate polarity. Polarity is ob-
tained from an oscilloscope or voltmeter.
Heat Pump Applications
This subbase WILL NOT provide multi-stage heating or
cooling operation. For single-stage heat pump applica-
tions, install a short jumper wire across terminals Wand
Y.If the oldthermostathasaterminalthatiscontinuously
energized, disconnect the wire from the old thermostat’s
terminal and connect it either to the: 1) Bterminal, if the
reversingvalveisenergizedonacallforheat;or tothe2)
Oterminal,ifthereversing valve is energized onacallfor
cool. If the system heats on a call for cool, or vice versa,
this wire has been connected to the wrong terminal.
RHandRCmustbejumperedforsingletransformerheat
pump systems.
Special Application Terminals
The Band Oterminals can provide switching for special
functions other than heat pump operation. When the
system switch is in the HEAT position, the Bterminal is
energized. When the system switch is in the COOL
position, the Oterminal is energized.
ATTACH THERMOSTAT TO SUBBASE
1. Remove cover from thermostat base by gripping the
base in one hand. Use the other hand to pull gently
at the top or bottom of the cover.
2. Carefully remove the shipping protective packing
from the switch.
3. Attach thermostat base to subbase, being sure that
all captive screws are tightened snugly, since they
serve as electrical connections between thermostat
and subbase (see fig. 7).
4. Snap cover on thermostat and set switches and
temperature lever to desired set point (see OPERA-
TION section).
5. Turn on power to the system.
GRC
Y
W
B
OFF
FAN
AUTO ON SYSTEM COOL HEAT
Mounting screw KEEP THIS AREA
CLEAR OF WIRES Hole in wall Mounting screw
Figure 2. Thermostat subbase
ARH
O

4
NOTE
CAUTION
!
GRC
Y
W
B
A
RH
O
RH W B O Y G RC A
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER
Heat
Relay Compressor
Relay Fan Relay
** *
Factory-Installed Jumper
SYSTEM
THERMOSTAT
WIRING
Figure 4. Typical wiring for single transformer heating/cooling system
KEEP THIS
AREA CLEAR
OF WIRES!
Factory-installed
red jumper wire
Factory-installed
yellow jumper wire
* * *
Terminal energized
in cooling Terminal energized in heating
Take care when securing and routing wires so
they do not short to adjacent terminals or rear of
thermostat.Personalinjuryand/orpropertydam-
age may occur.
These typical wiring diagrams show only the terminal
identification and wiring hookup. Always refer to wiring
instructions, provided by equipment manufacturer, for
system hookup operation.
GRH W
Factory-installed Jumper
SUBBASE
ADJUSTABLE HEATING
ANTICIPATOR
CAPTIVE
SCREWS
SYSTEM
SWITCH
COOL
OFF
HEAT
SYSTEM
SWITCH
COOL
OFF
HEAT
ON
FAN
SWITCH
AUTO
Figure 3. Typical wiring diagram (see figs. 4, 5, and 6 for typical system/thermostat wiring)
RC O YA* B
FIXED COOLING
ANTICIPATOR
THERMOSTAT
SYSTEM
*Terminal “A” is not for field wiring. See
SPECIAL SYSTEM CONFIGURATIONS
section for proper use of terminal “A”.
Moveable
yellow jumper
GRC
Y
W
B
A
RH
O
THERMOSTAT
WIRING
Figure 5. Typical wiring for two-transformer heating/cooling system
KEEP THIS
AREA CLEAR
OF WIRES!
Factory-installed
yellow jumper wire
RH W B O Y GA
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER Heat
Relay Compressor
Relay Fan Relay
** *
SYSTEM
* * *
Terminal energized
in cooling Terminal energized in heating
24 VAC 120 VAC
Hot
Neutral
TRANSFORMER
RC
NOTE: Remove factory-
installed jumper between
RC and RH terminals for
this application.

5
GRC
Y
W
B
A
RH
O
THERMOSTAT
WIRING
Figure 6. Typical wiring for single transformer, single stage heat pump system
KEEP THIS
AREA CLEAR
OF WIRES!
W BO YG A
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER Compressor
Relay
Fan
Relay
* * *
Factory-Installed Jumper
SYSTEM
* * *
Terminal energized
in cooling Terminal energized in heating
Field-installed
jumper wire
RH
Field-Installed Jumper
RC
Factory-installed
red jumper wire
Factory-installed
yellow jumper wire
Figure 7. Attach thermostat to subbase
Cover Thermostat
Subbase
OFF
FAN
AUTO ON SYSTEM
COOL HEAT
50
60
70
50
60 70 80
90 80
90
FAN
AUTO ON
SYSTEM
COOL OFF HEAT
Shows switch position
OPERATION
No heating; no cooling; no fan
No heating; no cooling; fan runs continuously
Cooling system cycles from thermostat; fan runs
continuously
Cooling system and fan cycle from thermostat
Heating system cycles from thermostat; fan cycles
from fan control on furnace
Heating system cycles from thermostat; fan runs
continuously
Figure 8. Subbase switching and thermostat/system operation
OPERATION &
MAINTENANCE
Thisthermostat is easy to operate.Fig. 8
shows how the heating/cooling system
andfan operatewhentheswitchesarein
various positions. Use the system switch
to select either heating or cooling, or to
turn the heating/cooling system off. Use
the fan switch to control fan operation.
When the fan switch is in the AUTO
position, the fan will cycle with the heat-
ing or cooling system (the fan will not run
ifthesystemswitchisintheOFFposition
and the fan switch is in the AUTO posi-
tion). When the fan switch is in the ON
position, the fan will run continuously,
regardlessofsystemswitchposition(even
ifthe system switchis set toOFF,the fan
will run if the fan switch is in the ON
position).

CAUTION
!
CAUTION
!
ADJUSTING HEAT ANTICIPATOR
The adjustable heat anticipator WILL BURN OUT
if 25 VAC is applied directly to the thermostat by
shorting out the primary control during testing.
This may cause personal injury and/or property
damage.
This thermostat is equipped with an adjustable heat
anticipator and was preset at the factory to provide
satisfactory operation of the heating system under nor-
mal conditions. If additional adjustments are necessary,
they may be made as follows (see fig. 9):
1. Remove thermostat cover.
2. If heat cycle is too long, set heat anticipator to a
slightly lower dial setting (1⁄2division).
3. If heat cycle is too short, set heat anticipator to a
slightly higher dial setting (1⁄2division).
4. Replace thermostat cover.
CALIBRATING THERMOSTAT
Thisthermostathasbeencarefullyadjustedatthefactory
and should not require recalibration.
Due to environmental conditions, during normal opera-
tion there may be a few degrees of difference between
the indicator setting of the thermostat and actual room
temperature. If the disagreement is appreciable, how-
ever, first make sure that the thermostat is properly
located and leveled. Then, if recalibration still seems
necessary, proceed as follows:
To prevent electrical shock and/or equipment
damage, disconnect electrical power to the sys-
tem until recalibration is complete.
1. The anticipator’s heat may adversely affect thermo-
statrecalibration.Topreventthis,disconnectelectri-
calpowertothethermostatatthefurnace,mainfuse,
or breaker box.
2. Movetemperatureadjustmentlevertoasettingabout
5°above room temperature.
3. Removethermostatcover.Slip7⁄32”calibrationwrench
onto hex nut beneath bimetal. While holding tem-
perature adjustment lever stationary, turn hex nut
clockwise until mercury shifts to the right end of the
tube (see fig. 10).
4. Movetemperatureadjustmentlevertolowestsetting.
5. Replace thermostat cover. Wait 10 minutes for bi-
metaltemperaturetostabilize.Donotstandnearthe
thermostat during this period, as your breath and
body heat will affect bimetal temperature.
6. Movetemperatureadjustmentlevertocorrespondto
actual room temperature. Then remove thermostat
cover.
7. Slip7⁄32” calibration wrench onto hex nut. While hold-
ing temperature adjustment lever stationary, turn
hex nut counterclockwise until mercury just barely
shifts to the left end of the tube (see fig. 10).
8. Replace thermostat cover and set temperature ad-
justment lever to desired temperature. Turn on elec-
trical power to system.
If you need further information about this product,
write to us at:
WHITE-RODGERS DIVISION
Emerson Electric Co.
9797 Reavis Road
St. Louis, MO 63123
Attn: Technical Service Department
.18
.25
.3
.4
.2
.15
1.2
.8
.6
.5
Arrow points to the
matched current rating
of the primary control
Move this lever to
adjust heat
anticipator
Figure 9. Anticipator adjustment
L
O
N
G
E
R
C
Y
C
L
E
S
Bimetal
7⁄32”Calibration
wrench
Temperature
adjustment
lever
Figure 10. Calibrating thermostat