White Rodgers 1F85ST-0422 Installation, Wiring Connections, Remove Old Thermostat, Batteries

INSTALLATION

!WARNING

Thermostat installation and all components of the control system shall conform to Class II circuits per the NEC code.

Figure 1 – Battery door shown open

“AA” Alkaline Batteries

Remove Old Thermostat

A standard heat/cool thermostat consists of three basic parts:

1)The cover, which may be either a snap-on or hinge type.

2)The base, which is removed by loosening all captive screws.

3)The switching subbase, which is removed by unscrewing the mounting screws that hold it on the wall or adapter plate. Before removing wires from old thermostat, label each wire with the terminal designation from which it was attached. Disconnect the wires from the old thermostat one at a time. Do not let wires fall back into the wall.

Installing New Thermostat

1)Pull the thermostat body off the thermostat base. Forcing or prying on the thermostat will cause damage to the unit.

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

3)Move base out of the way. Drill mounting holes. If you are using existing mounting holes and the holes drilled are too large and do not allow you to tighten base snug- ly, use plastic screw anchors to secure the base.

4)Fasten base snugly to wall using mounting holes shown in Figure 2 and two mounting screws. Leveling is for appearance only and will not affect thermostat operation.

5)Connect wires to terminal block on base.

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

7)Carefully line the thermostat up with the base and snap into place.

Thermostat can be powered by system AC power or Battery.

If is displayed, the thermostat is battery powered. If

is not displayed, thermostat is system powered with optional battery back-up. When battery power remaining is approxi-

mately half, the will be displayed. When “Change ” is displayed, install fresh “AA” alkaline batteries immediately. For best results, replace all batteries with new premium brand alkaline batteries such as Duracell® or Energizer®. We recom- mend replacing batteries every 2 years. If the home is going to be unoccupied for an extended period (over 3 months) and is displayed, the batteries should be replaced before leaving. When less than two months of battery life remain, the setpoint temperature will offset by 10 degrees (10 degrees cooler in Heat mode / 10 degrees warmer in Cool mode). If offset occurs, the normal setpoint can be manually reset with or . Another offset will occur within two days if batter- ies are not replaced.

Figure 2 – Thermostat base and rear view of thermostat

Mounting	Mounting
Hole	Hole
Place Level	Place Level
across	across
Mounting Tabs	Mounting Tabs
(for appearance only)	(for appearance only)

Batteries

2 “AA” alkaline batteries are included with the thermostat. To install the batteries, pull the battery door as shown by the arrow and lift open. Using the polarity indicated inside the bat- tery door, insert the batteries. To close the battery door, swing the door down while pulling in the direction of arrow. Once fully down, snap the door back into position. To replace the batteries, set system to OFF.

WIRING CONNECTIONS

Refer to equipment manufacturers’ instructions for specific		Refer to 37-6895for 1F83-0422/1F85-0422 wiring diagram
system wiring information. After wiring, see CONFIGURATION		specifications.
section for proper thermostat configuration.
	TERMINAL DESIGNATION DESCRIPTIONS
Terminal		Terminal
Designation	Description	Designation	Description
L	Heat pump malfunction indicator for systems	W/E	Heat Relay/Emergency Heat Relay (Stage 1)
	with malfunction connection	W2	2nd Stage Heat (3rd Stage Heat in HP 2)
O	Changeover valve for heat pump energized	G	Fan Relay
	constantly in cooling	RH	Power for Heating
B	Changeover valve for heat pump energized	RC	Power for Cooling
	constantly in heating	C	Common wire from secondary side of cooling system
Y	Compressor Relay		transformer or heat only system transformer
Y2	2nd Stage Compressor	6	3 Wire Zone Valve – Energized when no call for Heat

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