White Rodgers 1F84-51 User Manual
1F84-51
Programmable Electronic Digital
WHITE-RODGERS
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.
Heat Pump Thermostat
INSTALLATION AND
OPERATION INSTRUCTIONS
DESCRIPTION
Your new White-Rodgers 7-Day Digital Heat Pump Thermostat
uses the technology of a solid-state microcomputer to provide
precise time/temperature control. This thermostat offers you the
flexibility to design heating and cooling programs that fit your
needs.
Features:
• Separate program for each day of the week
• Simultaneous heat and cool program storage
• Preprogrammed temperature control
• Four separate time/temperature settings per 24 hour period
This thermostat is intended for use with a 24 volt system; do not
use this thermostat with a millivolt or line voltage system. If in
doubt about whether your wiring is millivolt, line, or low voltage,
have it inspected by a qualified heating and air conditioning
contractor or electrician.
Do not exceed the specification ratings.
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.
• LCD continuously displays set point, and alternately displays time and room temperature
• Temperature override until next program period
• Manual program override (HOLD temperature)
• °F/°C convertibility
• Temperature range 45° to 90°F
• Eight terminals for single or two-transformer systems
• O/B terminal for heat pump systems
• Armchair Programming Capability
PRECAUTIONS
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 damage
thermostat and could cause personal injury and/or
property damage.
ELECTRICAL DATA
Electrical Rating:
20 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.5 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
THERMAL DATA
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range:
32°F to 105°F
Operating Humidity Range:
0 to 90% RH (non-condensing)
Shipping Temperature Range:
-40°F to 150°F
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
APPLICATIONS
For use with:
• Heat pump systems with up to two stages heat, one stage
cool
DO NOT USE WITH:
• Millivolt systems
• Systems exceeding 30 VAC and 1.5 amps
• 3-wire zoned hydronic heating systems
Printed in U.S.A.
SPECIFICATIONS
PART NO. 37-5739A
Replaces 37-5613C
9637
INSTALLATION
Figure 1. Back of thermostat base
W904
CUT FOR
NON-ELECTRIC
AUX.
O
B
W903
CUT TO DEFEAT EMR
BATTERY CUTOUT FOR
ARMCHAIR PROGRAMMING
Figure 2. Thermostat base
SET TIME
RUN PRGM
VIEW PRGM
HOLD TEMP
AUTO
FAN ON
COOL
OFF
HEAT
EMER
Reset Button
Mounting
holes
Screw anchors
L
E
Y
W2
O/B
R
G
C
REMOVE OLD THERMOSTAT
1. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
2. 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.
3. Identify each wire attached to the old thermostat using
the labels enclosed with the new thermostat.
4. Disconnect the wires from old thermostat one at a time. DO
NOT LET WIRES FALL BACK INTO THE WALL.
5. Install new thermostat using the following procedures.
ATTACH THERMOSTAT BASE TO WALL
1. Remove the packing material from the thermostat.
2. If necessary, cut the non-electric heat jumper (see NON-
ELECTRIC HEAT SYSTEMS) and/or the EMR jumper (see
ENERGY MANAGEMENT RECOVERY). Check the set-
ting of the O/B switch (see O/B TERMINAL SWITCH
SELECTION).
3. If you want to program the thermostat before mounting the
thermostat on the wall, see ARMCHAIR PROGRAMMING.
4. Gently pull the thermostat cover straight off the base. Forcing
or prying on the thermostat will cause damage to the unit.
5. Check that the SYSTEM switch is in the OFF position.
Connect wires beneath terminal screws on base using
appropriate wiring schematic (see figs. 3 through 5).
6. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
7. Move base out of the way. Drill mounting holes.
8. Fasten base loosely to wall, as shown in fig. 2, using two
mounting screws. Place a level against bottom of base,
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 base snugly, use
plastic screw anchors to secure subbase.
9. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.
NON-ELECTRIC HEAT SYSTEMS
Read the following information before clipping the non-electric
heat jumper. If you are unsure of your application, contact a
qualified serviceperson.
If your emergency or auxiliary system is non-electric (gas, oil,
etc.) and will energize the blower, then jumper, W904, on the
back of the thermostat base must be cut (see fig. 1).
If your emergency or auxiliary heat system is electric and
requires that the thermostat energize the fan circuit, do not cut
jumper W904.
ENERGY MANAGEMENT RECOVERY
When the EMR feature is activated, the thermostat's microcomputer automatically calculates the time it will take to change the
room temperature to the next program setting. Then the thermostat will start the heating or cooling system before the next
2
programmed period so that the desired temperature is reached
at or near the beginning of the next program period (the
thermostat calculates 30 minutes for every 2°F temperature
change).
For example, assume that the thermostat is programmed to
provide an overnight heating temperature of 66°F, and during
the next program period, beginning at 6:00 AM, the programmed
temperature is 70°F. With EMR activated, the thermostat will
automatically start the heating system at 5:00 AM, so that the
programmed temperature of 70°F is reached by about 6:00 AM.
If the overnight room temperature drops only to 68°, the thermostat will start the system at 5:30 to reach the programmed
temperature of 70° at 6:00.
The thermostat is shipped with the EMR feature active, which
(EMR)
means that the thermostat will start the system before the
beginning of the next program period. This feature provides
better efficiency by allowing gradual temperature changes using
only the first stage of heat and cooling.
To de-activate the EMR function, clip wire W903 on the back
of the thermostat (see fig. 1). The thermostat will then wait until
the programmed time to start the system for a temperature
change. This may cause the more costly electric second stage
of heating to be used.
tion and wiring. For proper installation, refer to the original
manufacturer's instructions.
NOTENOTE
Relay contacts shown are thermostatically operated.The following wiring diagrams show typical terminal identifica-
FAN ON
FAN
AUTO
Heat
or Cool
Changeover
Relay*
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
FAN
AUTO
Emer
G W2
Fan
Relay
Aux/Emer
Relay
(Stage 2)
Figure 3. 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!
HOT
120 VAC
NEUTRAL
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
24 VAC
Changeover
Relay*
Compressor
Contactor
FAN
AUTO
Heat
or Cool
Fan
Relay
FAN ON
FAN
AUTO
Emer
G W2
EMERGENCY
E
Emergency
Relay
EMERGENCY
Emergency
Aux/Emer
Relay
(Stage 2)
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Thermostat
Control
Circuit
CYO/B
E
Relay
MALF
SYSTEM
MONITOR
SWITCH
24 VAC
Thermostat
Control
Circuit
CYO/B
L
R
TRANSFORMER
MALF
SYSTEM
MONITOR
SWITCH
THERMOSTAT
SYSTEM
Hot
120 VAC
Neutral
R
Limit or
Safety
Switches
24 VAC
THERMOSTAT
L
SYSTEM
Hot
120 VAC
Neutral
TRANSFORMER
Figure 4. Typical wiring diagram for two transformer systems with NO safety circuits
FAN ON
FAN
AUTO
Heat
or Cool
Changeover
Relay*
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
FAN
AUTO
Emer
G W2
Fan
Relay
EMERGENCY
Emergency
Aux/Emer
Relay
(Stage 2)
TWO COMMONS MUST
BE JUMPERED TOGETHER!
E
Relay
Thermostat
Control
Circuit
Figure 5. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems
CYO/B
MALF
SYSTEM
MONITOR
SWITCH
L
R
COMMON
Limit or
Switches
Limit or
Safety
Switches
Polarity must be observed. If the HOT side of
NOTE
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
Safety
ACCESSORY
RELAY N.O.
24 VAC
24 VAC
CONTACT
COMMON
24 VAC 120 VAC
Heat Pump Transformer
SYSTEM
Auxiliary
Heating
Transformer
120 VAC
Limit or
Safety
Switches
NOTE
The accessory relay scheme
is required when safety
circuits exist in both systems.
Limit or
Safety
Switches
HOT
NEUTRAL
HOT
NEUTRAL
3
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