WHITE-RODGERS
1F56W-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.
90
80
70
60
50
AUTO
FAN
ON
COOL
SYSTEM
OFF
HEAT
70
60
90
80
50
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.
All wiring must conform to local and national electrical codes and ordinances.
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
PRECAUTIONS
This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction.
!
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.
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.
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
Printed in U.S.A.
PART NO. 37-6199B
Replaces 37-6199A
0105
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 - Sealed mercury switch
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 1F56W-911 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
This thermostat CANNOT BE USED with:
• Millivolt systems
• Multi-stage applications
INSTALLATION
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.
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.
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.
1
⁄
2
” hole for thermostat wire
Stout cord with 6” chain attached
Baseboard strip moulding
Quarter round removed
1 ⁄
4
” guide hole for sighting
Approximately
5 feet from floor
ROUTE WIRES TO LOCATION
NOTE
All wiring must conform with local and national electrical codes and ordinances.
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 ⁄
4
” hole in floor of partition
Hooked wire for snagging chain
Figure 1. Routing thermostat wires
2
ATTACH SUBBASE TO WALL
!
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).
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.
Heat Pump Applications
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.
NOTE
RH and RC must be jumpered for single transformer heat pump systems.
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.
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.
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.
Two-Transformer Systems
!
CAUTION
If two transformers are used, they MUST be in phase. Failure to do so may result in personal injury and/or property damage.
AUTO
FAN
ON COOL
SYSTEM
OFF HEAT
G RC
B
NOTE
Wire color DOES NOT indicate polarity. Polarity is obtained from an oscilloscope or voltmeter.
O
RH A
Y
W
Mounting screw KEEP THIS AREA
CLEAR OF WIRES
Hole in wall
Figure 2. Thermostat subbase
Mounting screw
3
!
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.
Adjustable Heating
Anticipator
NOTE
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
THERMOSTAT
Fan
Switch
AUTO ON
Captive
Screws
System
Switch
COOL
COOL
OFF HEAT
System
Switch
HEAT
SUBBASE
Moveable
Yellow Jumper
G RC O
Factory-installed Jumper
RH Y W A* B
* Terminal "A" is not for field wiring. See
SPECIAL SYSTEM CONFIGURATIONS section for proper use of terminal "A".
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
Factory-installed
Red Jumper Wire
O
B
THERMOSTAT
WIRING
W
Factory-installed
Yellow Jumper Wire
RH A
Y
Factory-Installed Jumper
RH W B O Y G RC A
Hot
120 VAC 24 VAC
Neutral
TRANSFORMER
Heat
Relay
* *
*
Terminal energized in cooling
*
Compressor
Relay
Fan
Relay
* *
Terminal energized in heating
SYSTEM
Figure 4. Typical wiring for single transformer heating/cooling system
KEEP THIS
AREA CLEAR
OF WIRES!
Factory-installed
Yellow Jumper Wire
NOTE: Remove factory- installed jumper between
RC and RH terminals for this application.
O
RH
G RC
A
Y
B
W
THERMOSTAT
WIRING
RH W B A O Y
TRANSFORMER
Hot
24 VAC 120 VAC
Neutral
Heat
Relay
*
Terminal energized in cooling
* * *
* *
Terminal energized in heating
Compressor
Relay
G RC
Fan
Relay
24 VAC
TRANSFORMER
Hot
120 VAC
Neutral
SYSTEM
Figure 5. Typical wiring for two-transformer heating/cooling system
4
KEEP THIS
AREA CLEAR
OF WIRES!
G RC
Factory-installed
Red Jumper Wire
B
O THERMOSTAT
WIRING
W
Factory-installed
Yellow Jumper Wire
Factory-Installed Jumper
RC G RH
TRANSFORMER
Hot
120 VAC
Neutral
24 VAC
*
Fan
Relay
Terminal energized in cooling
RH
O
*
A
Y
Field-Installed Jumper
W Y
Compressor
Relay
* *
Terminal energized in heating
B
* *
Field-installed
Jumper Wire
A
SYSTEM
Figure 6. Typical wiring for single transformer, single stage heat pump system
AUTO
FAN
ON
COOL
SYSTEM
OFF
HEAT
90
80
70
60
50
70
60
50
90
80
Thermostat
Cover
Figure 7. Attach thermostat to subbase
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
AUTO ON COOL OFF HEAT
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
5
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.
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.
Remove thermostat cover. Slip 7 ⁄
32
” wrench onto hex nut beneath bimetal. While holding temperature adjustment lever stationary, turn hex nut clockwise until mercury shifts to the right end of the tube (see fig. 10).
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. While holding 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 adjustment lever to desired temperature. Turn on electrical power to system.
CALIBRATING THERMOSTAT
This thermostat has been carefully adjusted at the factory and should not require recalibration.
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:
.5
.3
.25
.4
.6
L
O
N G
E R
C
Y
C
S
.2
.18
Arrow points to the matched current rating of the primary control
.8
1.
.15
Move this lever to adjust heat anticipator
Figure 9. Anticipator adjustment
!
CAUTION
To prevent electrical shock and/or equipment damage, disconnect electrical power to the system until recalibration is complete.
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.
Bimetal
Temperature adjustment lever
7 ⁄
32 ” Calibration wrench
Figure 10. Calibrating thermostat
If you need further information about this product, write to us at:
WHITE-RODGERS DIVISION
Emerson Electric Co.
9797 Reavis Road
St. Louis, MO 63123-5398
Attn: Technical Service Department
1F56W-911
