White Rodgers 1F85-0477 User Manual

2

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. 

 

label each wire with the terminal designation from 
which it was attached. Disconnect the wires from the 
old thermostat one at a time. 

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.

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.

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 

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.

“AA” Alkaline Batteries

Mounting

Hole

Mounting

Hole

Place Level

across

Mounting Tabs

(for appearance only)

Place Level

across

Mounting Tabs

(for appearance only)

Refer to equipment manufacturers’ instructions for specific system wiring information. After wiring, see CONFIGURATION section 
for proper thermostat configuration. Refer to figure 3 through 6 for

 wiring diagram specifications.

 

L .............. Heat pump malfunction indicator for systems

                             with malfunction connection 
 

O .............. Changeover valve for heat pump energized

                             constantly in cooling
 

B .............. Changeover valve for heat pump energized

                             constantly in heating
 

Y .............. Compressor Relay

 

Y2 ............. 2nd Stage Compressor

 

 

W/E ............Heat Relay/Emergency Heat Relay (Stage 1)

 

W2 .............2nd Stage Heat (3rd Stage Heat in HP 2)

 

G ..............Fan Relay

 

RH .............Power for Heating

 

RC .............Power for Cooling

 

C ..............Common wire from secondary side of cooling system  

 

                              transformer or heat only system transformer
 

6...............3 Wire Zone Valve – Energized when no call for Heat