Replacing Existing Thermostat - Robertshaw RS4110 Installation Manual

IMPORTANT SAFETY INFORMATION WARNING:
• Always turn off power at main fuse or circuit breaker panel before
installing, removing, cleaning, or servicing thermostat.
• Read all the information in this manual before installing this thermostat.
• This is a 24 VAC low-voltage thermostat. Do not install on voltages
higher than 30 VAC.
• All wiring must conform to local and national building and electrical
codes and ordinances.
• To take advantage of the Pop-Up Wizard, power should be applied when
the settings are ready to be entered. Fill in the chart in the Pop-Up
Wizard section before applying power.
• This is a dual powered thermostat that will operate on 24 VAC or batteries.
• Do not short (jumper) across terminals on the gas valve or at the
system control to test installation. This will damage the thermostat and
void the warranty.
• Do not connect ground to any terminal in this unit.
• This thermostat is configured with automatic compressor protection to
prevent damage because of short cycling or extended power outages.
Short cycle protection provides a delay between compressor cycles on
heat pumps.

Replacing Existing Thermostat

1. Turn off power to heating and cooling system.
2. Remove cover from old thermostat to expose wires.
3. Disconnect wires one at a time from existing terminals. Use enclosed
labels to mark existing wires. Refer to cross references in Table 1 if
existing wiring does not directly match the labels.
4. Remove existing thermostat base from wall.
Table 1
Old Terminal
R, RH/R, V-VR or VR-R
RC
Y, Y1 or M
F or G
Y2
W2 or W-U
C, X or B
W1 or W
New Label
R/RH
RC
Y1
G
Y2
W2
C
W1
2
Description
24V AC Return
24V AC Cooling Transformer
1st Stage Cooling Circuit
Fan Control Relay
2nd Stage Cooling Circuit
2nd Stage Heating Control
24V AC Transformer Common Side
1st Stage Heating Circuit