1F56N-911
Low Voltage Heating/Cooling Thermostat
INSTALLATION INSTRUCTIONS
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.
DESCRIPTION
This low voltage thermostat is designed to provide convenient control of the heating/cooling system. To provide
greater room comfort, the sensitive spiral bimetal is combined with an adjustable heating anticipator and a fixed
cooling anticipator to provide maximum comfort.
FAN
ON
AUTO
90
COOL
SYSTEM
HEAT
OFF
°C
32
°C
32
21
21
10
10
80
90
80
70
60
70
60
50
50
PRECAUTIONS
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.
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting components could cause the control to malfunction.
! CAUTION
Do not exceed the specification ratings.
All wiring must conform to local and national electrical
codes and ordinances.
CONTENTS
Description ........................................................
Precautions .......................................................
Specifications ....................................................
Installation .........................................................
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 .................................
Adjusting Heat Anticipator
Calibrating Thermostat
1
1
2
2
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 primary control to test. Short or incorrect wiring will
burn out heat anticipator and could cause personal injury and/or property damage.
!
WARNING
Do not use on circuits exceeding 30 volts. Higher
voltage will damage control and could cause
shock or fire hazard.
Thermostat installation and all components of
the system shall conform to Class II circuits per
the NEC code.
5
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com
PART NO. 37-6923A
0807
SPECIFICATIONS
ELECTRICAL DATA
Switch Rating: 24 VAC (30 VAC max.)
Heating - 0.15 to 1.2 Amps
Cooling - 0 to 1.5 Amps
Switch Action: SPST - Snap Action
Anticipator Rating:
Heating - Adjustable from 0.15 to 1.2 Amps
Cooling - Fixed 24 VAC
APPLICATIONS
The 1F56N is 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
THERMAL DATA
Temperature Range: 50°F to 90°F (10°C to 32°C)
Differential: 1°F
This thermostat CANNOT BE USED with:
• Millivolt systems
• Multi-stage applications
INSTALLATION
ATTENTION: This product does not contain mercury.
However, t his product may replace a unit which contains
mercury.
ROUTE WIRES TO LOCATION
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.
All wiring must conform with local and national electrical
codes and ordinances.
NOTE
1. If an old thermostat being replaced is in a satisfactory
location, and the wiring appears to be in good condition, use existing wiring. If in doubt, re-wire.
2. If a new location is chosen or if this is a new installation, thermostat wiring must first be run to the location
selected.
3. 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 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 with
hooked wire. In houses without basements, drop cord
through hole in ceiling and down partitioning; snag
cord at the thermostat location.
5. Attach thermostat wires to cord and pull thermostat
wires through hole in wall so that 6” of wire protrudes.
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.
SELECT THERMOSTAT LOCATION
Proper location insures that the thermostat will provide 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 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 is warmer or
cooler than the rest of the home, such as the kitchen.
1⁄ ” hole for
2
thermostat wire
Stout cord with 6”
chain attached
Approximately
5 feet from floor
Baseboard
strip moulding
1⁄ ”
4
guide hole
for sighting
Quarter round
removed
8. Avoid locations with poor air circulation, such as
behind doors or in alcoves.
9. The living or dining room is normally a good location,
provided there is no cooking range or refrigerator on
opposite side of wall.
3⁄ ”
4
hole in floor of partition
Hooked wire for snagging chain
Figure 1. Routing thermostat wires
2
Heat Pump Applications
ATTACH SUBBASE TO WALL
This subbase WILL NOT provide multi-stage heating or
cooling operation. For single-stage heat pump applications, install a short jumper wire across terminals W and
Y. If the old thermostat has a terminal that is continuously
energized, disconnect the wire from the old thermostat's
terminal and connect it either to the: 1) B terminal, if the
reversing valve is energized on a call for heat; or to the 2)
O terminal, if the reversing valve is energized on a call for
cool. If the system heats on a call for cool, or vice versa,
this wire has been connected to the wrong terminal.
! CAUTION
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
and connect wires beneath terminal screws (see figs.
2 through 6 for typical wiring for each application. Also
refer to subsections below for special system configurations).
NOTE
RH and RC must be jumpered for single transformer heat
pump systems.
3. Push excess wiring into wall and plug hole with fireresistant material (such as fiberglass insulation) to
prevent drafts from affecting thermostat operation.
4. Position subbase over hole in wall and mark mounting
hole locations on wall.
5. Drill mounting holes.
6. Fasten subbase loosely to wall, as shown, using two
mounting screws. Place a level against bottom of
subbase, adjust until level, and then tighten mounting
screws to secure subbase. If holes in wall are too
large and do not allow you to tighten subbase snugly,
use plastic expansion plugs to secure subbase.
Special Application Terminals
The B and O terminals can provide switching for special
functions other than heat pump operation. When the
system switch is in the HEAT position, the B terminal is
energized. When the system switch is in the COOL
position, the O terminal 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 OPERATION section).
SPECIAL SYSTEM CONFIGURATIONS
Electric Heat Furnaces (Single Transformer Systems
Only)
The subbase as shipped may not operate the fan correctly. If both the heating and cooling system must operate the fan relay, remove the yellow factory-installed
jumper wire from the Y terminal and connect it to the A
terminal. The fan should now cycle when the thermostat
calls for either heat or cool.
5. Turn on power to the system.
Two-Transformer Systems
FAN
AUTO
! CAUTION
SYSTEM
COOL OFF HEAT
ON
If two transformers are used, they MUST be in
phase. Failure to do so may result in personal
injury and/or property damage.
G
RC
B
NOTE
O
Wire color DOES NOT indicate polarity. Polarity is obtained from an oscilloscope or voltmeter.
W
RH
Mounting screw
A
KEEP THIS AREA
CLEAR OF WIRES
Y
Hole
in wall
Mounting screw
Figure 2. Thermostat subbase
3
! CAUTION
NOTE
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.
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.
Fixed Cooling
Anticipator
Adjustable Heating
Anticipator
THERMOSTAT
Captive
Screws
System
Switch
Fan
Switch
O
C
O
T
O
C
EA
O
L
OFF
H
ON
AUTO
L OFF HE
G
RC
AT
System
Switch
RH
O
Moveable
Yellow Jumper
SUBBASE
W
Y
A*
B
* Terminal "A" is not for field wiring. See
SPECIAL SYSTEM CONFIGURATIONS
section for proper use of terminal "A".
Factory-installed Jumper
SYSTEM
Figure 3. Typical wiring diagram (see figs. 4, 5, and 6 for typical system/thermostat wiring)
KEEP THIS
AREA CLEAR
OF WIRES!
G RC
B
Factory-installed
Red Jumper Wire
O
THERMOSTAT
WIRING
W
Factory-installed
Yellow Jumper Wire
RH
A
Y
Factory-Installed Jumper
RH
Hot
W
B
O
Y
G
RC
Heat
Relay
**
*
Compressor
Relay
Fan
Relay
A
SYSTEM
24 VAC
120 VAC
Neutral
Terminal energized
TRANSFORMER
Terminal energized
* in cooling
* * in heating
Figure 4. Typical wiring for single transformer heating/cooling system
KEEP THIS
AREA CLEAR
OF WIRES!
G RC
B
Factory-installed
Yellow Jumper Wire
O
NOTE: Remove factoryinstalled jumper between
RC and RH terminals for
this application.
RH
TRANSFORMER
Hot
120 VAC
THERMOSTAT
WIRING
W
RH
W
Heat
Relay
B
A
**
A
Y
O
Y
G
*
Compressor
Relay
Fan
Relay
RC
24 VAC
24 VAC
TRANSFORMER
Hot
120 VAC
SYSTEM
Neutral
Neutral
Terminal energized
* in cooling
Terminal energized
* * in heating
Figure 5. Typical wiring for two-transformer heating/cooling system
4
KEEP THIS
AREA CLEAR
OF WIRES!
G RC
B
Factory-installed
Red Jumper Wire
O
THERMOSTAT
WIRING
W
Factory-installed
Yellow Jumper Wire
RH
Factory-Installed Jumper
RC
TRANSFORMER
Field-installed
Jumper Wire
Y
Field-Installed Jumper
RH
O
Fan
Relay
Hot
120 VAC
G
A
W
*
Y
B
Compressor
Relay
**
A
SYSTEM
24 VAC
Neutral
*
Terminal energized
in cooling
**
Terminal energized
in heating
Figure 6. Typical wiring for single transformer, single stage heat pump system
FA
TO N
AU
ON
CO SYS
OL TEM
OF
F
HE
AT
90
80
70
60
50
90
80
Subbase
70
60
50
Thermostat
Cover
Figure 7. Attach thermostat to subbase
OPERATION &
MAINTENANCE
This thermostat is easy to operate. Fig. 8
shows how the heating/cooling system
and fan operate when the switches are in
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 heating
or cooling system (the fan will not run if
the system switch is in the OFF position
and the fan switch is in the AUTO position). When the fan switch is in the ON
position, the fan will run continuously,
regardless of system switch position (even
if the system switch is set to OFF, the fan
will run if the fan switch is in the ON
position).
Shows switch position
FAN
SYSTEM
OPERATION
AUTO
ON
COOL OFF HEAT
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
5
1. The anticipator’s heat may adversely affect thermostat recalibration. To prevent this, disconnect electrical power to the thermostat at the furnace, main fuse,
or breaker box.
2. Move temperature adjustment lever to a setting about
5° above room temperature.
ADJUSTING HEAT ANTICIPATOR
! CAUTION
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.
3. Remove thermostat cover. Slip 7¦32” wrench onto hex
nut beneath bimetal (see fig. 10). While holding
temperature adjustment lever stationary, turn hex
nut clockwise until movable contact moves off of
magnet.
4. Move temperature adjustment lever to lowest setting.
5. Replace thermostat cover. Wait 10 minutes for bimetal temperature to stabilize. Do not stand near the
thermostat during this period, as your breath and
body heat will affect bimetal temperature.
6. Move temperature adjustment lever to correspond to
actual room temperature. Then remove thermostat
cover.
7. Slip 7¦32” wrench onto hex nut (see fig. 10). While
holding temperature adjustment lever stationary, turn
hex nut counterclockwise until movable contact just
closes against magnet.
8. Replace thermostat cover and set temperature adjustment lever to desired temperature. Turn on electrical power to system.
This thermostat is equipped with an adjustable heat
anticipator and was preset at the factory to provide
satisfactory operation of the heating system under normal
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¦2 division).
3. If heat cycle is too short, set heat anticipator to a
slightly higher dial setting (1¦2 division).
4. Replace thermostat cover.
.3 .25
O
NG
YCLES
.5
ER
C
L
.4
.6
.8 1.
Arrow points to the
matched current rating
of the primary control
.2
.18
.15
Move this lever to
adjust heat
anticipator
Figure 9. Anticipator adjustment
CALIBRATING THERMOSTAT
This thermostat has been carefully adjusted at the factory
and should not require recalibration.
Bimetal
Due to environmental conditions, during normal operation
there may be a few degrees of difference between the
indicator setting of the thermostat and actual room temperature. If the disagreement is appreciable, however,
first make sure that the thermostat is properly located and
leveled. Then, if recalibration still seems necessary, proceed as follows:
7⁄32”
Temperature
adjustment
lever
Calibration
wrench
Figure 10. Calibrating thermostat
! CAUTION
To prevent electrical shock and/or equipment
damage, disconnect electrical power to the system until recalibration is complete.
6
7
HOMEOWNER HELP LINE: 1-800-284-2925
The Emerson logo is a
trademark and a service mark
of Emerson Electric Co.
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