Robertshaw RS4220C User Manual page 2

Application
The Robertshaw RS4000C family of thermostats is designed to control
gas, electric, oil, heat pump, and millivolt heating and electric cooling
systems. The RS4220C is a two stage thermostat. The RS4320C can
support three stages of heating and two stages of cooling in heat pump
applications.
The RS4000C thermostats are non-programmable and operate on
separate heating and cooling setpoints.
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 24V AC low-voltage thermostat. Do not install on voltages
higher than 30V AC.
• All wiring must conform to local and national building and electrical
codes and ordinances.
• 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 heating
and cooling cycles on heat pumps.
Detailed mounting and wiring instructions are explained in the
Installation Manual.
Refer to the pop up wizard section in the installation manual for a
complete list of factory defaults and contractor settings.
Providing Power to the Thermostat
For wiring diagrams refer to the Installation Manual.
The thermostats will operate using 24V AC or two AA batteries. When
the two AA batteries are installed the thermostat will continue to run if
the 24V AC fails.
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