White Rodgers 7904 User Manual

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.

Your new White-Rodgers 5-Day/2-Day Digital 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:

• Battery powered (3 “AA” Energizer® alkaline batteries included).

• Separate 5-day (weekday) and 2-day (weekend) programming

• Simultaneous heat and cool program storage

• Preprogrammed temperature control

• Four separate time/temperature settings per 24-hour period

Model No. 7904

Programmable Electronic Digital Thermostat

INSTALLATION AND

OPERATION INSTRUCTIONS

DESCRIPTION

• LCD continuously displays set point, and alternately displays time and room temperature

• Temperature override until next program period

• Manual program override (HOLD temperature)

• User may select either 12- or 24-hour clock display

• °F/°C convertibility

• Temperature range 45° to 90°F

• Standard five terminals for single or two-transformer systems

• B and O terminals for single stage heat pumps or damper operation

This thermostat is intended for use with a low voltage system; do not use this thermostat with a 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.

ELECTRICAL DATA Electrical Rating:

8 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

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.

SPECIFICATIONS

APPLICATIONS

For use with:

• Standard heat/cool or heat only systems

• Electric heat systems

• Gas or oil fired systems

• Gas systems with intermittent ignition devices (I.I.D.)

and/or vent dampers

• Hydronic (hot water or steam) systems

• Single-stage heat pump systems

• Millivolt systems

DO NOT USE WITH:

• Multi-stage systems

• Systems exceeding 30 VAC and 1.5 amps

• 3-wire zoned hydronic heating systems

WHITE-RODGERS DIVISION

EMERSON ELECTRIC CO. 9797 REAVIS ROAD ST. LOUIS, MISSOURI 63123-5398

Printed in U.S.A.

PART NO. 37-5599B

Replaces 37-5599A

9731

INSTALLATION

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.

ELECTRIC HEAT OR SINGLE-STAGE

HEAT PUMP SYSTEMS

Read entire paragraph before setting electric heat switch. If you are unsure of your application, contact a qualified serviceperson.

If you have a single-stage heat pump system, OR your system uses central electric heat, then you must move the switch on the back of the thermostat base to the electric heat position (see fig

1). The electric heat position is to the left. Use a small screw-

driver or pencil to move the switch.

ELECTRIC GAS

Electric/Gas switch

Figure 1. Back of thermostat base

Alkaline batteries (3 “AA”–

install “+” ends to the left)

Screw anchors

ATTACH THERMOSTAT BASE TO WALL

1. Remove the packing material from the thermostat. Gently pull the cover straight off the base. Forcing or prying on the thermostat will cause damage to the unit. If necessary, move the electric heat switch (see ELECTRIC HEAT SYSTEMS, above).

2. Connect wires beneath terminal screws on base using appropriate wiring schematic (see figs. 3 through 10).

3. Place base over hole in wall and mark mounting hole locations on wall using base as a template.

4. Move base out of the way. Drill mounting holes.

5. 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.

6. Push excess wire into wall and plug hole with a fire-resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.

BATTERY LOCATION

This thermostat requires 3 “AA” alkaline batteries to operate. Batteries are included. Install the batteries along the top

of the base (see fig. 2). The batteries must be installed with the positive (+) ends to the left.

If the word BATTERY is displayed, the batteries are low and should be replaced with fresh “AA” Energizer® alkaline batteries.

Mounting

holes

Figure 2. Thermostat base

HYDRONIC (HOT WATER OR STEAM)

HEATING SYSTEMS

This thermostat is set to operate properly if you have a forcedair heating system. If you have a hydronic heating system (a system that heats with hot water or steam), you must set the thermostat to operate properly with your system. To change the setting, press and hold SET TIME and VIEW PRGM buttons at the same time until the correct setting is displayed (A for forced air; H for hydronic systems).

NOTE

If you do not press both buttons at the same time, A or H will not be displayed. If this happens, press RUN PRGM, then press and hold SET TIME and VIEW PRGM at the same time.

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