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.
Blue Universal Thermostat with Automatic Heat/Cool Changeover Option
Single Stage, Multi-Stage or Heat Pump Installation and Operating Instructions for Model:
Model |
Programming Choices |
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1F85CA-0471 |
5/1/1 Day |
5/2 Day |
Non-Programmable |
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1F85-0471 |
5/1/1 Day |
5/2 Day |
Non-Programmable |
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1F83-0471 |
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Non-Programmable |
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APPLICATIONS
THERMOSTAT APPLICATION GUIDE
Description |
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1F85CA-0471 Thermostat |
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Heat Pump (No Aux. or Emergency Heat) |
Yes |
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Heat Pump (with Aux. or Emergency Heat) |
Yes |
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Systems with up to 2 Stages Heat, 2 Stages Cool |
Yes |
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Heat Only Systems (with optional fan switch) |
Yes |
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Millivolt Heat Only Systems – Floor or Wall Furnaces |
Yes |
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Cool Only Systems |
Yes |
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Gas or Oil Heat |
Yes |
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Electric Furnace |
Yes |
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Hydronic (Hot Water) Zone Heat – 2 Wires |
Yes |
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Hydronic (Hot Water) Zone Heat – 3 Wires |
Yes |
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Compressor with Comfort Alert II Module (1F85CA only) |
Yes |
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SPECIFICATIONS
Electrical Rating: |
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Battery Power .................................................... |
mV to 30 VAC, NEC Class II, 50/60 Hz or DC |
Input-Hardwire ................................................... |
20 to 30 VAC |
Terminal Load ........................................................... |
1.5 A per terminal, 2.5A maximum all terminals combined |
Setpoint Range......................................................... |
45° to 90°F (7° to 32°C) |
Differential (Single Stage)......................................... |
Heat 0.6°F; Cool 1.2°F (adjustable) |
Differential (Heat Pump) ........................................... |
Heat 1.2°F; Cool 1.2°F (adjustable) |
Operating Ambient.................................................... |
32° to +105°F (0° to +41°C) |
Operating Humidity ................................................... |
90% non-condensing max. |
Shipping Temperature Range ................................... |
-40° to +150°F (-20° to +65°C) |
Dimensions Thermostat............................................ |
4.0”H x 5.11”W x 1.3”D |
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! 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.
Index |
Page |
Installation |
2 |
Wiring Connections |
2 |
Wiring Diagrams |
3 |
Thermostat Quick Reference |
4 |
Installer Confi guration Menu |
5 |
Operating Your Thermostat |
7 |
Programming |
7 |
Troubleshooting |
9 |
ATTENTION: MERCURY NOTICE
This product does not contain mercury. However, this product may replace a product that contains mercury.
Mercury and products containing mercury must not be discarded in household trash. Do not touch any spilled mercury.Wearing non-absorbent gloves, clean up any spilled mercury and place in a sealed container. For proper disposal of a product containing mercury or a sealed container. Refer to www.white-rodgers.com for location to send product containing mercury.
www.white-rodgers.com |
PART NO. 37-6920B |
Replaces 37-6920A |
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09051 |
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 snugly, 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 fi re resistant material (such as fi berglass insulation) to prevent drafts from affecting thermostat operation.
7.Carefully line the thermostat up with the base and snap into place.
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 battery 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 |
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will be displayed. When “Change |
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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 recommend 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 batteries 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) |
WIRING CONNECTIONS
Refer to equipment manufacturers’ instructions for specifi c |
Refer to fi gure 3 through 6 for wiring diagram specifi cations. |
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system wiring information. After wiring, see CONFIGURATION |
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section for proper thermostat confi guration. |
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TERMINAL DESIGNATION DESCRIPTIONS |
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Terminal |
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Terminal |
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Designation |
Description |
Designation |
Description |
L .............. |
Heat pump malfunction indicator for systems |
W/E ............ |
Heat Relay/Emergency Heat Relay (Stage 1) |
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with malfunction connection or Comfort Alert signal |
W2............. |
2nd Stage Heat (3rd Stage Heat in HP 2) |
O.............. |
Changeover valve for heat pump energized |
G .............. |
Fan Relay |
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constantly in cooling |
RH............. |
Power for Heating |
B.............. |
Changeover valve for heat pump energized |
RC............. |
Power for Cooling |
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constantly in heating |
C .............. |
Common wire from secondary side of cooling system |
Y.............. |
Compressor Relay |
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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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WIRING DIAGRAMS
Heat Pump Connections
If you do not have a heat pump system, refer to fi gures 4-6. Refer to equipment manufacturers’ instructions for specifi c system wiring information.
You can confi gure the thermostat for use with the following
heat pump systems.
Figure 3 – Heat Pump Systems
Jumper
HEAT PUMP TYPE 1 (HP 1). Single stage compressor system; gas or electric backup.
HEAT PUMP TYPE 2 (HP 2). Multi-stage compressor or two compressor system with gas or electric backup.
After wiring, see INSTALLER CONFIGURATION section for proper thermostat confi guration.
Jumper
L |
O/B |
Y |
Y2 |
W/E |
W2 |
G |
RH |
RC |
C |
NOTE: If your system does |
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not provide an E connection, |
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Heat Mode |
Blower/ |
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jumper W2 to W/E to use |
Heat Pump 1 |
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No |
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2nd Stage. |
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the Auxiliary Heat in the |
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Emergency |
Circulator |
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(HP1) |
Cool Mode |
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Output |
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Mode 2nd |
Fan Energized |
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Emergency Mode. |
Fault Indicator |
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Heat and |
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Emergency |
Stage |
on Call for |
24 Volt 24 Volt |
Optional* |
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or System |
B |
Cool Mode |
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Mode |
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Heat or Cool. |
(Hot) |
(Hot) |
24 Volt |
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Malfunction |
1st Stage |
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Heat Mode |
(Com- |
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Switch |
Energized in |
(Compressor) |
2nd |
1st Stage |
Set Elect/Gas |
Heat |
Cool |
mon) |
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Heat Pump 2 |
Heat, Off, |
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3rd Stage. |
Option for |
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* Common connection |
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Emergency |
Emergency |
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(HP2) |
Emergency |
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Mode |
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required for fault or |
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pressor) |
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Comfort Alert II Module |
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malfunction indication. |
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NEUTRAL |
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or Similar System |
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Malfunction Module |
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24VAC |
120VAC |
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HOT |
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CLASS II |
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TRANSFORMER |
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Single Stage and Multi-Stage Connections
Refer to equipment manufacturers’ instructions for specifi c system wiring information.
This thermostat is designed to operate a single-transformer or two-transformer system.
You can confi gure the thermostat for use with the following fossil fuel systems:
SINGLE STAGE (SS 1) gas, oil or electric. MULTI-STAGE (MS 2) gas, oil or electric.
After wiring, see INSTALLER CONFIGURATION section for proper thermostat confi guration.
Figure 4 – Single Stage or Multi-Stage System (No Heat Pump) with Single Transformer
Jumper
L |
O/B |
Y |
Y2 W/E |
W2 |
G |
RH RC |
C |
System
Single |
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O |
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Stage 1 |
Fault |
Energized Constantly |
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(SS1) |
Indicator |
in Cool Mode |
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or |
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Cool Mode |
Multi- |
System |
B |
1st Stage |
Malfunction |
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Stage 2 |
Energized Constantly |
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(MS2) |
Switch |
in Heat, Off, |
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Emergency |
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Mode |
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No |
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Blower/ |
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No Output |
Circulator |
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Output |
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Fan Energized |
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24 Volt |
Optional* |
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Heat |
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on Call for |
24 Volt |
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Cool (and |
(Hot) |
(Hot) |
24 Volt |
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(Com- |
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Cool 1st Stage |
Heat Mode |
Heat if |
Heat |
Cool |
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mon) |
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Mode |
2nd Stage |
configured |
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2nd |
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Stage |
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Heat) |
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*Common connection required for fault or
malfunction indication.
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Comfort Alert II Module |
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or Similar System |
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NEUTRAL |
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Malfunction Module |
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24VAC |
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120VAC |
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HOT |
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CLASS II |
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TRANSFORMER |
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Figure 5 – Single Stage or Multi-Stage System (No Heat Pump) with Two Transformers
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Jumper |
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Remove Jumper Wire |
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between RH & RC |
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L |
O/B |
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Y |
Y2 |
W/E |
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W2 |
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G |
RH |
RC |
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C |
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System |
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Single |
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O |
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No |
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Blower/ |
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Stage 1 |
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Energized Constantly |
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No Output |
Circulator |
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Output |
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(SS1) |
Fault |
in Cool Mode |
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Fan Energized |
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Optional |
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Heat |
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24 Volt |
24 Volt |
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Indicator |
B |
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Cool Mode |
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on Call for |
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24 Volt |
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Mode |
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Cool (and |
(Hot) |
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(NOT |
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1st Stage |
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Heat |
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Cool |
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Multi- |
USED) |
Energized Constantly |
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Cool |
1st Stage |
Heat Mode |
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Heat if |
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mon) |
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in Heat, Off, |
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Mode |
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configured |
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Stage 2 |
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Emergency |
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2nd Stage |
for Electric |
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2nd |
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Heat) |
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NEUTRAL |
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NEUTRAL |
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24VAC |
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Figure 6 – 3-Wire (SPDT) Heat Only Zone Valve Wiring |
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TRANSFORMER |
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6 |
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Single Stage |
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Closes |
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Opens |
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Blower/Circulator |
24 Volt |
24 Volt |
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Valve |
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Valve |
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Zone Valve |
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(6) |
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(4) |
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(5) |
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mon) |
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NEUTRAL |
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24VAC |
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120VAC |
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TRANSFORMER |
3 |
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THERMOSTAT QUICK REFERENCE
Home Screen Description
Figure 7 – Home Screen Display
Room Setting
Temperature Temperature
Displays the power level of the 2 “AA” batteries:
indicates good power level
indicates batteries at about half power. “Change 
” indicates batteries are low and should be replaced with 2 new premium brand “AA” Alkaline batteries.
(See page 2 for more details)
|
Mo |
P |
Set |
SYSTEM |
FAN |
Heat |
Auto |
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Menu |
System |
Fan |
Indicator |
Indicator |
Programming and Configuration Items
1“System On” indicates when heating or cooling stage is energized. “System On +2” indicates when a second
stage is energized.
2The word “Hold” is displayed when the thermostat is in the Hold mode. “Temp Hold” is displayed when
the thermostat is in a Temporary Hold mode.
3Displays “Change Filter” when the system has run for the programmed fi lter time period as a reminder to
change or clean your fi lter. |
1 |
4Displays “Set” for setpoint when in Run Program mode.
5Displays System Mode (Heat, Emer, Auto, Cool, Off) or “Time” in Menu Mode.
6Displays Fan Mode (On, Auto) or “Run Sched” in Menu Mode.
7Displays “Run Schedule”, “Schedule”, or “Menu”.
8Displays “Save” when Cool SavingsTM is working.
9Displays “Heat Pump” when system is confi gured as Heat Pump thermostat.
10Displays “Hold” in programmable mode. When not in Hold mode, displays 
(light bulb) in non-programmable mode.
Figure 8 – Programming & Configuration Items
2 4
|
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Mo Tu We Th Fr Sa Su |
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12 |
P Date |
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Set |
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Temp Hold |
8 |
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Month Call For Service |
Save |
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3 |
Change |
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Year |
10 |
Filter |
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Hold |
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System On 2 |
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Auto Sched |
11 |
9 |
Heat Pump |
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Cool Savings |
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SYSTEM |
FAN |
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Run |
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Heat Emer Auto |
On Auto |
Schedule |
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Cool Off Time |
Run Sched |
Menu |
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5 |
6 |
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7 |
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11Initially displays “Auto Sched”. If Auto Schedule had been used or disabled, then it displays “Cool Savings”
when in the Cool Mode if Cool Savings has been enabled in the menu.
12“Call For Service” indicates a fault in the heating/ cooling system, it does not indicate a fault in the
thermostat.
4
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