This White-Rodgers Digital Thermostat uses
microcomputer technology to provide precise
time, humidity, and temperature control. This
thermostat offers the flexibility to design
SPECIFICATIONS
1F95-391: 7 Day programming; residen-
tial applications.
ELECTRICAL DATA
Electrical Rating:
20 to 30 VAC, 50/60 Hz with common
0.05 to 1.5 Amps per terminal
2.5 Amps maximum total load (all
terminals combined).
Hardwired only.
C terminal is required.
PRECAUTIONS
WARNING
!
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.
Do not use on circuits exceeding
specified voltage. Higher voltage will
damage thermostat 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.
heating and cooling programs that fit
building needs. This thermostat is adaptable
to most 24 volt residential forced air multi-
Standard Systems:
Multi-stage gas, oil, electric.
Single-stage or two-stage compressor
heat pump.
THERMAL DATA
Setpoint Temperature Range:
45° to 99°F (7° to 37°C)
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.
NOTE
Read all instructions thoroughly before
beginning installation.
This thermostat is intended for use with a
low voltage system. Do not use on a line
voltage system.
stage or heat pump systems with electric or
fossil fuel auxiliary.
Operating Ambient Temperature:
32° to 110°F (0° to 43°C)
Operating Humidity Range:
90% non-condensing max.
Shipping Temperature Range:
-4° to 149°F (-20° to 65°C)
Do not exceed ratings shown in the Specifications section, above. If in doubt about the
electrical ratings of your heating/cooling
system, have it inspected by a qualified
heating and air conditioning contractor or
licensed electrician.
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.
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com
Part No. 37-6527B
Replaces 37-6527A
0443
INSTALLATION
ATTENTION!
This product does not contain mercury.
However, this product may replace a unit
which contains mercury.
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 with sand or other absorbent
material and place into a container which can
be sealed. If a cell becomes damaged, the
unit should be discarded.
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
for proper disposal.
REMOVE OLD THERMOSTAT
Shut off electricity at main fuse or circuit
breaker box until installation is complete
AND the new thermostat is configured
properly.
Remove the front cover of the old thermostat. With wires still attached, remove wall
plate from the wall.
Identify each wire attached to the thermostat using one of the labels enclosed with the
new thermostat.
Disconnect the wires from the old thermostat
one at a time. DO NOT let the wires fall
back into the wall.
Install the new thermostat using the following procedures.
ATTACH BASE TO WALL
Remove packing material from the thermostat. Place fingers of one hand on the center
top and bottom portion of the thermostat.
Grasp the base in the other hand on top and
bottom center and gently pull straight out.
Forcing or prying on the thermostat will
cause damage to the unit.
Place the base over the hole in the wall
where the wires come out and mark mounting hole locations using the base as a
template. Drill
3
⁄16” pilot holes, and install
screw anchors in the wall.
Run wires through hole in base and attach
base to wall (see fig. 1).
Insert the wires into the terminals on the base
using the appropriate wiring diagram and
tighten the terminal screws.
CONFIGURING AND PROGRAMMING
The thermostat must be configured to operate
properly with the system. See the CONFIGURATION section of this manual.
This thermostat can be programmed for
automatic temperature control. Refer to
Operating Instructions for programming.
Mounting screws
1
Pull wires through this opening
2
Insert wires into terminal holes, then tighten screws
3
Screw anchors
4
Jumper connections for remote sensor power
5
(Do not remove)
Figure 1. Thermostat base and terminals
2
MULTI-STA GE TERMINAL OUTPUTS
Refer to equipment manufacturers’ instructions for specific system wiring information.
You can configure the thermostat for use
with either multi-stage electric heat systems
or multi-stage gas systems. When configured
for electric heat, the G terminal (blower/fan)
will be energized on a call for heat, using the
installer table (pgs. 5 & 6).
THERMOSTAT TERMINALS (Upper)
L SA SB SC OT
Malfunction Light Remote Sense A Remote Sense B Remote Sense C Outdoor Sensor
SYSTEM C R HM W2 DHM E/W1 Y2 Y1 B O G
Multi-Stage
24 Volt
(Common)
24 Volt
(Hot)
Energizes on a
call for heat if
Humidity setpoint is
above room
humidity.
This thermostat is designed to operate a
single-transformer system. If you have a twotransformer system, cut and tape off one
transformer. If transformer safety circuits are
in only one of the systems, remove the
transformer of the system with NO safety
circuits. If required, replace remaining
transformer with a 75VA Class II transformer.
After disconnecting one transformer, the two
commons must be jumpered together.
THERMOSTAT TERMINALS (Lower)
Heat mode
2nd stage
E2/P switch in the P position,
Energizes on a call for
Dehumidification.
E2/P switch in E2 position,
De-energizes on a
call for Dehumidification.
Heat mode
1st stage
Cool mode
2nd stage
Use the terminal output information below to
help you wire the thermostat properly for
your multi-stage system. After wiring, see
CONFIGURATION section for proper
thermostat configuration.
Cool mode
1st stage
Energized in Heat
and Off Mode
Energized in
Cool Mode
Blower/Fan
Energized on
call for Cool
(and Heat if
configured
to Electric Heat).
HEAT PUMP TERMINAL OUTPUTS
Refer to equipment manufacturers’ instructions for specific system wiring information.
You can configure the thermostat for use
with the following heat pump system types:
HEAT PUMP TYPE 1. Single-stage
compressor system; gas or electric backup.
HEAT PUMP TYPE 2. Multi-stage or twocompressor system; gas or electric backup.
This thermostat is designed to operate a
single-transformer system. If you have a twotransformer system, cut and tape off one
transformer. If transformer safety circuits are
in only one of the systems, remove the
transformer of the system with NO safety
circuits. If required, replace remaining
transformer with a 75VA Class II transformer.
After disconnecting one transformer, the two
Use the terminal output information below to
help you wire the thermostat properly for
your heat pump system type. After wiring,
see CONFIGURATION section for proper
thermostat configuration.
commons must be jumpered together.
THERMOSTAT TERMINALS (Upper)
L SA SB SC OT
Malfunction Light Remote Sense A Remote Sense B Remote Sense C Outdoor Sensor
THERMOSTAT TERMINALS (Lower)
SYSTEM C R HM W2 DHM E/W1 Y2 Y1 B O G
Single-stage compressor system; gas or electric backup
Heat Pump 1
Multi-stage or two compressor system; gas or electric backup
Heat Pump 2
24 Volt
(Common)
24 Volt
(Common)
24 Volt
(Hot)
24 Volt
(Hot)
Energizes on a
call for heat if
Humidity setpoint is
above room
humidity.
Energizes on a
call for heat if
Humidity setpoint is
above room
humidity.
Heat mode
3rd stage,
Emergency Mode
2nd stage
Emergency Mode
2nd stage
E2/P switch in P position,
Energizes on a call for
Dehumidification.
E2/P switch in E2 position,
De-energizes on a
call for Dehumidification.
E2/P switch in P position,
Energizes on a call for
Dehumidification.
E2/P switch in E2 position,
De-energizes on a
call for Dehumidification.
Heat mode
2nd stage,
Emergency Mode
1st stage
Heat mode
3rd stage,
Emergency Mode
1st stage
No Output
Heat and
Cool mode
2nd stage
(compressor 2)
Heat and
Cool mode
1st stage
(compressor 1)
Heat and
Cool mode
1st stage
(compressor 1)
Energized in Heat,
Off, Emergency
Mode
Energized in Heat,
Off, Emergency
Mode
Energized in
Cool Mode
Energized in
Cool Mode
Blower/Fan
Energized on
call for Heat and Cool
Blower/Fan
Energized on
call for Heat and Cool
3
CONFIGURATION
SWITCHES
RESET SWITCH
See the Troubleshooting section at the end
of this document for more information about
the function of this switch.
E2/P SWITCH (DHM) TERMINAL
S18
FUNCTION
The E2/P switch is located on the back of
the thermostat body (see fig. 2). This switch
controls how the DHM terminal will be
energized.
1. In the P position (up) the DHM terminal will
be energized on a call for dehumidification.
2. In the E2 position (down) the DHM terminal
will always be energized except on a call for
dehumidification. The switch must be in the E2
position on some electronically controlled
variable speed blower systems.
DEHUMIDIFICATION WIRING WITHOUT AN ELECTRONICALLY CONTROLLED VARIABLE SPEED BLOWER SYSTEM
FOR SINGLE STAGE COMPRESSOR SYSTEM ONLY
If you have a single stage compressor system see the diagram below. A relay (customer provided) should be installed as shown in Fig. 5 to
switch the fan speed to the next lower speed on a call for dehumidification from the thermostat. The reduction in air flow allows the coil to remove
more humidity from the air. The relay should be rated for blower motor load. Since this configuration reduces the air flow in cooling, the antifreeze-up control (White-Rodgers CAFC) or equivalent is recommended. The CAFC prevents the air conditioning coil from freezing due to low
air flow, dirty filters, low refrigerant pressure, etc. The CAFC snaps onto the suction line close to the evaporator coil as possible and breaks the
compressor circuit when the suction line drops below 38°F and re-make the circuit at 46°F.
Reset switch
1
E2/P switch
2
Figure 2. Switch locations on back of thermostat body
P
E2
S19
1
2
NOTE: If you have a two stage compressor, the thermostat software will lengthen cycle times for the first stage of cool. The longer cycles will
improve dehumidification while cooling, allowing the DHM terminal not to be used on a two stage compressor system.
Selecting P - DHM Energizes on call for
Dehumidification
Selecting E2 - DHM Deenergizes on call for
Dehumidification
CRG
Y1
E2
DHM
P
N.C.
Customer supplied relay
rated for blower motor load
N.O.
24VAC
TRANSFORMER
Cool Fan Speed
Furnace
Control
Module
MED. HIGH
Heat Fan Speed
HIGH
3-4 speed
Blower
LOW
Motor
COMMON
HOT
120 VAC
NEUTRAL
Figure 3. Typical Wiring for Dehumidifier System
HM
Relay
90-290Q
or equivalent
Humidifier
System
Figure 4. Typical Wiring for 120V Humidifier System
HOT
NEUTRAL
120 VAC
Typical Wiring for 120V Humidifier System
24 VAC
R
I
TRANSFORMER
HOT
NEUTRAL
120 VAC
HM
Humidifier
System
Typical Wiring for 24V Humidifier System
Figure 5. Typical Wiring for 24V Humidifier System
24 VAC
R
I
TRANSFORMER
HOT
NEUTRAL
4
120 VAC
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