WHITE-RODGERS
1F91W-71
Multi-stage Electronic Digital 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 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 settings for a five-day
(weekday) program and a two-day (weekend) program.
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.
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.
PRECAUTIONS
All wiring must conform to local and national electrical codes and ordinances.
Do not exceed the specification ratings.
This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction.
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
!
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.
!
WARNING
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
Printed in U.S.A.
PART NO. 37-5519A
9522
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 24 VAC end of the transformer.)
ELECTRICAL DATA
Electrical Rating:
20 to 30 VAC 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
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% (non-condensing)
Shipping Temperature Range:
-40
°
F to 150
°
F
STAGING DATA
Up to 3 heating stages
Up to 2 cooling stages
INSTALLATION
ACCESSORIES
Remote Sense Kit W. R. Part No. F145-1170
Thermostat Guard W. R. Part No. F29-0198 (clear) or
F29-0238 (opaque)
NEW INSTALLATION
ROUTE WIRES TO LOCATION
IT IS RECOMMENDED THAT YOU PROGRAM THE
THERMOSTAT WITH BATTERY INSTALLED BEFORE
ATTACHING ON SUBBASE. SEE OPERATION GUIDE
FOR PROGRAMMING INSTRUCTIONS.
All wiring must conform with local and national electrical codes and ordinances.
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.
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. Snag 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 at least 6" of wires protrudes.
1 ⁄
2
” hole for thermostat wire
Stout cord with 6” chain attached
Baseboard strip moulding
1 ⁄
4
” guide hole for sighting
Quarter round removed
Approximately
5 feet from floor
3 ⁄
4
” hole in floor of partition
Hooked wire for snagging chain
Figure 1. Routing thermostat wires
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.
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.
NOTE
THIS THERMOSTAT REQUIRES BOTH THE HOT AND
COMMON SIDES OF THE 24 VAC TRANSFORMER TO
BE PRESENT TO THE THERMOSTAT FOR OPERA-
TION.
PULL STRAIGHT OUT
Figure 2. Removing thermostat from subbase
G
1
9
Y1
Y1
9
1
G
TABLE 1. WIRE IDENTIFICATION LABELS
2
C
3
L
4
R
5
O
6
B
7
E1
8
E2
C
2
10
Y2
Y2
10
L
3
11
W1
W1
11
R
4
12
W2
W2
12
O
5
13
W3
W3
13
B
6
14
S1
S1
14
E1
7
15
S2
S2
15
E2
8
16
S3
S3
16
LABEL
NUMBER
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(1)
(2)
(3)
(4)
(5)
(6)
TABLE 2. TERMINAL REFERENCE
1F91-71
TERMINAL
DESIGNATION
B
—
—
Y1
Y2
W1
W2
W3
G
C
—
R
O
FUNCTION
Fan output
Transformer 24 VAC common
—
Transformer 24 VAC hot
Changeover output (cool)
Changeover output (heat)
—
—
Stage 1 cool
Stage 2 cool
Stage 1 heat
Stage 2 heat
Stage 3 heat
OLD THERMOSTAT
TERMINAL
DESIGNATION
3
2.
Connect wires beneath terminal screws on subbase using 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.
Mounting hole O
B
Y1
Y2
C
G
9-pin connector
Pull wires through this opening
Expansion plugs
Connect wires under terminal screws
W1
4-pin connector
R
W2
W3
Figure 3. Subbase
Mounting hole
4
!
WARNING
DO NOT EXCEED MAXIMUM VOLTAGE OR CUR-
RENT RATINGS. FIRE, PERSONAL INJURY, AND/
OR EQUIPMENT DAMAGE COULD RESULT.
!
CAUTION
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.
NOTE
The following wiring diagrams show typical terminal identification and wiring. For proper installation, refer to the original manufacturers' instructions.
O B
Changeover
Energized
In Heat
Y1 Y2
Compressor
Contactor
Stage 2
G W1
Heat
Relay
Stage 1
W2 W3
Heat
Relay
Stage 3
R
Thermostat
Control
Circuit
C
THERMOSTAT
SYSTEM
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
Fan
Relay
Heat
Relay
Stage 2
24 VAC
Hot
120 VAC
Neutral
TRANSFORMER
Figure 4. Typical wiring diagram for single transformer systems
NOTE
IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE
SYSTEMS, REMOVE THE TRANSFORMER OF THE
SYSTEM WITH NO SAFETY CIRCUITS.
CUT AND
TAPE OFF!
O B
Changeover
Energized
In Heat
Hot
120 VAC
Neutral
24 VAC
Changeover
Energized
In Cool
TRANSFORMER
Y1 Y2
Compressor
Contactor
Stage 2
Compressor
Contactor
Stage 1
G
Fan
Relay
TWO COMMONS MUST
BE JUMPERED TOGETHER!
W1
Heat
Relay
Stage 1
W2 W3 R
Thermostat
Control
Circuit
C
THERMOSTAT
SYSTEM
Heat
Relay
Stage 3
Heat
Relay
Stage 2
Limit or
Safety
Switches
TRANSFORMER
24 VAC
Hot
120 VAC
Limit or
Safety
Switches
Neutral
DEPENDING ON SYSTEM
REQUIREMENTS, REPLACE
WITH A 75VA TRANS-
FORMER, IF NEEDED
Figure 5. Typical wiring diagram for two-transformer systems with NO safety circuits
NOTE
Relay contacts shown are thermostatically operated. The accessory relay scheme is required when safety circuits exist in both systems.
!
CAUTION
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
Control
Circuit
O B Y1 Y2
Changeover
Energized
In Heat
Compressor
Contactor
Stage 2
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
G
Fan
Relay
W1
Heat
Relay
Stage 1
W2 W3
Heat
Relay
Stage 2
Heat
Relay
Stage 3
C R
THERMOSTAT
SYSTEM
Limit or
Safety
Switches
24 VAC
24 VAC
Accessory
Relay N.O.
Contact
Hot
120 VAC
Limit or
Safety
Switches
Neutral
HEATING
TRANSFORMER
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Limit or
Safety
Switches
24 VAC
Hot
120 VAC
Neutral
COOLING
TRANSFORMER
Limit or
Safety
Switches
Figure 6. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
5
ATTACH THERMOSTAT TO SUBBASE
IT IS RECOMMENDED THAT YOU SET OPTION
SWITCHES TO DESIRED POSITION BEFORE ATTACH-
ING ON SUBBASE (see OPERATION). IT IS ALSO
RECOMMENDED THAT YOU PROGRAM THE
THERMOSTAT WITH BATTERY INSTALLED BEFORE
ATTACHING ON SUBBASE (see OPERATION GUIDE for programming instructions). 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.
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 right section of the subbase (when viewed from the front).
Gently pivot the thermostat down until the 9-pin connec-
ENGAGE TWO UPPER GUIDES;
PIVOT DOWN
Figure 7. Attaching thermostat to subbase
OPERATION
SYSTEM CONFIGURATION
NOTE
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.
Multi-stage Systems — up to 3 heat stages and 2 cool stages
ON
1 2 3 4
Switch #1
Switch #2
ON
OFF
Switch #3 (see step 3)
Switch #4 (see step 4)
2.
Electric Heat Systems
ON
1 2 3 4
Switch #1
Switch #2
ON
ON
Switch #3 (see step 3)
Switch #4 (see step 4)
3.
Economizer — 1st stage cooling
ON
1 2 3 4
Switch #1 (see steps 1-2)
Switch #2 (see steps 1-2)
Switch #3 ON
Switch #4 (see step 4)
4.
Automatic Changeover from Heat to Cool
ON
1 2 3 4
Switch #1 (see steps 1-2)
Switch #2 (see steps 1-2)
Switch #3 (see step 3)
Switch #4 ON
NOTE
The battery maintains the stored program in the event of a power failure. When attached to the wall with 24 VAC power applied, the thermostat will function normally without the battery. However, the program will be lost in the event of a power failure or interruption 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.
4-pin connector Battery
Option switches 9-pin connector
Figure 8. Back of thermostat
6
CHECK THERMOSTAT OPERATION
After heating and cooling system have been checked and are running properly, determine if automatic changeover is desired (see SYSTEM CONFIGURATION).
FAN OPERATION
1.
Turn on power to the system. If the heat source has a standing pilot, be sure to light it.
2.
Press FAN
ON - AUTO until FAN is displayed. The blower should begin to operate.
3.
Press FAN
ON - AUTO
until FAN is displayed. The blower should stop operating within approximately one minute.
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 thermostat.
HEATING SYSTEM
NOTE
When checking thermostat, option switch #4 (for automatic changeover) must be in the OFF position, to allow temporary setting of heat setpoints above cool settings.
After system checkout, reset option switch #4 to the ON position if automatic changeover is desired (see SYS-
TEM CONFIGURATION).
1.
Press SYSTEM
HEAT - OFF - COOL - AUTO
until HEAT is displayed (it may already be displayed).
2.
Press to adjust thermostat to 99
°
F. All stages of the heating system should begin to operate within five minutes (if the compressor is not operating, it may be locked out. See LOCKOUT BYPASS OPTION).
COOLING SYSTEM
!
CAUTION
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 SYSTEM
HEAT - OFF - COOL - AUTO
until COOL is displayed.
2.
Press to adjust the thermostat to 40
°
F. All stages of the cooling system should come on within five minutes (if the compressor is not operating, it may be locked out. See LOCKOUT BYPASS OPTION).
LOCKOUT BYPASS OPTION
!
CAUTION
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY. OPERATORS SHOULD NOT USE THIS FEA-
TURE DUE TO POSSIBILITY OF EQUIPMENT OR
PROPERTY DAMAGE, OR PERSONAL INJURY.
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.
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 ADV
PRGM and HOLD
TEMP
buttons at the same time at initial startup.
7
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
