White Rodgers 90 User Manual

WHITE-RODGERS

INSTALLATION

DESCRIPTION

COMFORT-SET® 90 SERIES

MULTI-STAGE/HEAT PUMP INSTALLATION/CONFIGURATION

This White-Rodgers Automatic Setback
Digital Thermostat uses microcomputer
technology to provide precise time and
temperature control. This thermostat offers

SPECIFICATIONS

1F93-380: 7 Day programming; commer-

cial 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)

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.

the flexibility to design heating and cooling
programs that fit building needs. This
thermostat is adaptable to most 24 volt

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.

commercial forced air multi-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)

This thermostat is intended for use with a
low voltage system. Do not use on a line
voltage system.

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.

Part No. 37-6066B

Replaces 37-6066A

0120

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 nonabsorbent gloves, take up the
spilled mercury 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
9797 Reavis Road, St. Louis, MO, 63123­5398 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.

3

⁄16” pilot holes, and install screw

Drill
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

Before the power is turned on, 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.

1

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)

4

2

PH D SASBSCOTL

3

1

R
C

W3A1E2

RC

EW2W1Y2Y1BOG

P

5

Figure 1. Thermostat base and terminals

2

MULTI-STAGE 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.

THERMOSTAT TERMINALS (Upper)

L PH D SA SB SC O T

Malfunction Light X-10 Module Input Not Used Remote Sense A Remote Sense B Remote Sense C Outdoor Sensor

SYSTEM

Multi-Stage No Function

E C R W3/A1 W2 E2/P W1 Y2 Y1 B O G

24 Volt

(Hot)

Damper terminal

energized in

occupied mode

24 Volt

(Common)

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

No function

Heat mode

1st stage

HEAT PUMP TERMINAL OUTPUTS

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 confgured to

Electric Heat).

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.

HEAT PUMP TYPE 3. System requiring

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.

separate signals for heat (W1, W2) and cool
(Y1); gas or electric backup.

THERMOSTAT TERMINALS (Upper)

L PH D SA SB SC OT

Malfunction Light X-10 Module Input Not Used Remote Sense A Remote Sense B Remote Sense C Outdoor Sensor

THERMOSTAT TERMINALS (Lower)

SYSTEM

Single-stage compressor system; gas or electric backup

Heat Pump 1*

Multi-stage or two compressor system; gas or electric backup

Heat Pump 2*

E C R W3/A1 W2 E2/P W1 Y2 Y1 B O G

Heat mode

1st stage.

Emergency

mode 1st

stage.

Emergency

mode 1st

stage

24 Volt

(Common)

24 Volt

(Common)

24 Volt

(Hot)

24 Volt

(Hot)

Damper terminal

energized in

occupied mode

Damper terminal

energized in

occupied mode

Heat mode 3rd

stage.

Emergency mode

2nd stage

Emergency mode

2nd stage

E2 - Emergency

mode constant

output.

P - All other modes

constant output.

E2 - Emergency

mode constant

output.

P - All other modes

constant output.

Heat mode

2nd stage

Heat mode

3rd stage

No Output

Heat and cool

modes 2nd

stage

(compressor 2)

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.

Heat and cool

modes 1st

stage

(compressor)

Heat and cool

modes 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

System requiring separate signals for heat (W1, W2) and cool (Y1); gas or electric backup

Heat Pump 3**

* If system does not provide connection to E, jumper W1 to E to provide Aux heating in emergency mode.
** If system does not provide connection to E, jumper W2 to E to provide Aux heating in emergency mode.

Emergency

mode 1st

stage

24 Volt

(Common)

24 Volt

(Hot)

Damper terminal

energized in

occupied mode

Heat mode 2nd

stage.

Emergency mode

2nd stage.

E2 - Emergency

mode constant

output.

P - All other modes

constant output.

3

Heat mode

1st stage

No Output

Cool mode

1st stage

Energized in

Heat, Off,

Emergency

Mode

Energized in

Cool Mode

Blower/Fan Energized

on call for Heat and

Cool