WHITE-RODGERS 1F91-71 Multi Stage Electronic Digital Thermostat Installation Guide
- June 17, 2024
- WHITE RODGERS
Table of Contents
1F91-71
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.
Do not exceed the specification ratings.
Printed in U.S.A.
WHITE-RODGERS DIVISION EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
PART NO. 37-4740B
Replaces 37-4740A 9307
PRECAUTIONS
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 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.
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.
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 24vAC end of
the transformer.)
ELECTRICAL DATA
Electrical Rating:
20 to 30v AC 50/60 Hz.
0.01 to 1.5 Amps (Load per terminal)
2.5 Amps Maximum Total Load (All terminals combined)
Anticipation:
STAGING DATA
Up to 3 heating stages
Up to 2 cooling stages
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 Rang e:
0 to 90% (non-condensing)
Shipping Temperature Range:
-40°F to 150°F
ACCESSORIES
Remote Sense Kit W. R. Part No. F145-1049
Thermostat Guard W. R. Part No. F29-0198 (clear) or F29-0238 (opaque)
INSTALLATION
NEW INSTALLATION
IT IS RECOMMENDED THAT YOU PROGRAM THE THERMOSTAT WITH BATTERY INSTALLED
BEFORE ATTACHING ON SUBBASE. SEE OPERATION GUIDE FOR PROGRAMMING INSTRUCTIONS.
SELECT THERMOSTAT LOCATION
Proper location insures that the thermostat will provide a comfortable
building temperature. Observe the following general rules when selecting a
location:
- Locate thermostat about 5 ft. above the floor.
- Install thermostat on a partitioning wall, not on an outside wall.
- Never expose thermostat to direct light from lamps, sun, fireplaces or any temperature radiating equipment.
- Avoid locations close to windows, adjoining outside walls, or doors that lead outside.
- Avoid locations close to air registers or in the direct path of air from them.
- Make sure there are no pipes or duct work in that part of the wall chosen for the thermostat location.
- Never locate thermostat in a room that normally warmer or cooler than the rest of the building.
- 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.
-
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). -
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.
-
Attach thermostat wires to cord and pull wires through hole in wall so that at least 6″ of wires protrudes.
REPLACEMENT INSTALLATION
REMOVE OLD THERMOSTAT
-
Shut off electricity at the main fuse box until installation is complete. Verify power is off with a voltmeter.
-
Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall.
-
If the old thermostat has a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly.
-
Use the Cross Reference Guide to find the thermostat type you are replacing.
-
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.
-
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. -
Install new thermostat using the following procedures.
ATTACH SUBBASE TO WALL
-
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 24vAC TRANSFORMER TO BE PRESENT TO THE THERMOSTAT FOR OPERATION.
TABLE 1. WIRE IDENTIFICATION LABELS1
G
G
1| 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
---|---|---|---|---|---|---|---
9
Y1
Y1
9| 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
TABLE 2. TERMINAL REFERENCELABEL
NUMBER| 1F91-71
TERMINAL
DESIGNATION| FUNCTION| OLD THERMOSTAT
TERMINAL
DESIGNATION
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)| G
C
—
R
O
B
—
—
Y1
Y2
W1
W2
W3| Fan output
Transformer 24vAC common
—
Transformer 24vAC hot
Changeover output (cool)
Changeover output (heat)
—
—
Stage 1 cool
Stage 2 cool
Stage 1 heat
Stage 2 heat
Stage 3 heat| - Connect wires beneath terminal screws on subbase using wiring schematic (see figs. 3 through 6).
- Place subbase over hole in wall and mark mounting hole locations on wall using subbase as a template.
- Move subbase out of the way. Drill mounting holes.
- 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.
- Push excess wire into wall and plug hole with a fire-resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.
WARNING
DO NOT EXCEED MAXIMUM VOLTAGE OR CURRENT 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.
NOTE
IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE SYSTEMS, REMOVE THE TRANSFORMER OF
THE SYSTEM 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 jumped
to the COMMON side of the first transformer, a short will be made. Damage to
equipment will occur when power is restored.
ATTACH THERMOSTAT TO SUBBASE
IT IS RECOMMENDED THAT YOU SET OPTION SWITCHES TO DESIRED POSITION BEFORE
ATTACHING 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).
POWER TO THERMOSTAT MUST BE OFF BEFORE ATTACHING THERMOSTAT TO WALL. FAILURE
TO TURN OFF POWER BEFORE ATTACHING THERMOSTAT 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 connectors 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
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
-
Multi-stage Systems — up to 3 heat stages and 2 cool stages Switch #1 ON
Switch #2 OFF
Switch #3 (see step 3)
Switch #4 (see step 4) -
Electric Heat Systems Switch #1 ON
Switch #2 ON
Switch #3 (see step 3)
Switch #4 (see step 4) -
Economizer — 1st stage cooling Switch #1 (see steps 1-2)
Switch #2 (see steps 1-2)
Switch #3 ON
Switch #4 (see step 4) -
Automatic Changeover from Heat to Cool 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 24v AC 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.
CHECK THERMOSTAT OPERATION
FAN OPERATION
- Turn on power to the system. If the heat source has a standing pilot, be sure to light it.
- Press until FAN is displayed. The blower should begin to operate.
- Press until FAN is displayed. The blower should stop operating within approximately one minute.
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 SYSTEM CONFIGURATION).
- Press until HEAT is displayed (it may already be displayed).
- 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.
- Press until COOL is displayed.
- 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
FEATURE 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 and buttons at the same time at initial
startup.
If you need further information about this product, please write to White-
Rodgers Division, Emerson Electric Co.
9797 Reaves Road
St. Louis, MO 63123-5398
Attention: Technical Service Department
WARRANTY INFORMATION
THIS WARRANTY STATEMENT SUPERSEDES ALL WARRANTY STATEMENTS DATED PRIOR TO
OCTOBER 1, 1991.
White-Rodgers Division of Emerson Electric Co. (“Seller”) warrants that its
products purchased for resale (the “Products”) will be free from defects in
material and workmanship under normal use and service for a period of twelve
(12) months from date of installation. Seller’s obligation under this
warranty, and Purchaser’s exclusive remedy for the breach thereof, shall be
limited to, at Seller’s option, Seller’s replacement of any defective Product
F.O.B. Seller’s factory (excluding the cost of labor and any other expenses
incurred in servicing the unit on which the Product is installed), or Seller’s
issuance of a credit in the amount of the purchase price of such Product for
resale as described below. Seller shall have the option of requiring the
return of any defective Product, transportation charges prepaid, before
recognizing any claim. This warranty shall not apply to any Product (1) which
has been repaired or altered outside Seller’s factory by other than Seller in
any manner so as, in Seller’s judgment, to affect its serviceability or proper
operation; (2) which has been subjected by persons other than Seller to
improper handling, operation, maintenance, repair or alteration; or (3) which
has been subjected to misuse, negligence, or accident.
This warranty extends only to persons or organizations who purchase the
Products for resale. THE FOREGOING CONSTITUTES SELLER’S SOLE RESPONSIBILITY
UNDER THIS WARRANTY, AND PURCHASER’S EXCLUSIVE REMEDY FOR THE BREACH THEREOF.
EXCEPT AS OTHERWISE EXPRESSLY SET FORTH IN THIS AGREEMENT, THERE ARE NO OTHER
WARRANTIES, EXPRESS OR IMPLIED, WHETHER OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE, OR OTHERWISE. SELLER SHALL NOT BE LIABLE FOR ANY SPECIAL,
INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER IN CONNECTION
WITH THE SALE, RESALE OR USE OF THE PRODUCTS.
Complete warranty information and instructions for replacing/ returning
warranty products can be found in the White-Rodgers Product Catalog, or by
telephoning or writing to:
White-Rodgers Division
Emerson Electric Co.
9797 Reaves Road
St. Louis, Missouri 63123-5398
314-577-1300
WARRANTY INFORMATION FOR CONSUMERS
When you purchase a White-Rodgers Division product, it is typically for
replacement of a device which has failed on existing residential or commercial
equipment, or a component of new equipment purchased for modernization.
While our warranty does not extend to you, your contractor or dealer is
protected by a one-year product warranty from White- Rodgers. Your supplier
can rely on a nearby White-Rodgers wholesaler for prompt credit or
replacement.
References
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