Attach Subbase to Wall

!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.

1.Disconnect electrical power at main fuse or circuit breaker.

2.Pull wires through opening near center of subbase and connect wires beneath terminal screws (see figs. 2 through 6 for typical wiring for each application. Also refer to subsections below for special system configu- rations).

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

4.Position subbase over hole in wall and mark mounting hole locations on wall.

5.Drill mounting holes.

6.Fasten subbase loosely to wall, as shown, using two mounting screws. Place a level against bottom of subbase, adjust until level, and then tighten mounting screws to secure subbase. If holes in wall are too large and do not allow you to tighten subbase snugly, use plastic expansion plugs to secure subbase.

SPECIAL SYSTEM CONFIGURATIONS

Electric Heat Furnaces (Single Transformer Systems Only)

The subbase as shipped may not operate the fan cor- rectly. If both the heating and cooling system must oper- ate the fan relay, remove the yellow factory-installed jumper wire from the Y terminal and connect it to the A terminal. The fan should now cycle when the thermostat calls for either heat or cool.

Two-Transformer Systems

!CAUTION

If two transformers are used, they MUST be in phase. Failure to do so may result in personal injury and/or property damage.

NOTE

Wire color DOES NOT indicate polarity. Polarity is ob- tained from an oscilloscope or voltmeter.

Heat Pump Applications

This subbase WILL NOT provide multi-stage heating or cooling operation. For single-stage heat pump applica- tions, install a short jumper wire across terminals W and Y. If the old thermostat has a terminal that is continuously energized, disconnect the wire from the old thermostat's terminal and connect it either to the: 1) B terminal, if the reversing valve is energized on a call for heat; or to the 2) O terminal, if the reversing valve is energized on a call for cool. If the system heats on a call for cool, or vice versa, this wire has been connected to the wrong terminal.

NOTE

RH and RC must be jumpered for single transformer heat pump systems.

Special Application Terminals

The B and O terminals can provide switching for special functions other than heat pump operation. When the system switch is in the HEAT position, the B terminal is energized. When the system switch is in the COOL position, the O terminal is energized.

ATTACH THERMOSTAT TO SUBBASE

1.Remove cover from thermostat base by gripping the base in one hand. Use the other hand to pull gently at the top or bottom of the cover.

2.Carefully remove the shipping protective packing from the switch.

3.Attach thermostat base to subbase, being sure that all captive screws are tightened snugly, since they serve as electrical connections between thermostat and subbase (see fig. 7).

4.Snap cover on thermostat and set switches and temperature lever to desired set point (see OPERA- TION section).

5.Turn on power to the system.

FANSYSTEM

AUTO

COOL OFF HEAT

G	RC
		B
O
		W
RH	A	Y
		Y

Mounting screw KEEP THIS AREA	Hole Mounting screw
CLEAR OF WIRES	in wall

White Rodgers 1F56W-911 Attach Subbase to Wall, Special System Configurations