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RC-112 / RC-112B Two Speed Heat Pump
3 Stage Heat / 2 Stage Cool - With Energy Efficient Control
Thermostat Installation Instructions
APPLICATION
This RC-112 thermostat is applicable to heat pumps with two stages of heating and cooling, plus a third stage of
heating called "auxiliary" heating. The heat pump may have a two-speed compressor (low and high speeds), two
compressors (stage 1 and stage 2) or a "superheater" or other device as the second stage. In normal operation,
stage 1 and 2 (or low and high speed) will be used as required to maintain the set temperature. In heating mode,
the auxiliary heating will only be used if the heat pump cannot maintain a rate of temperature rise with both
stages running (high speed).
The RC-112 is capable of being controlled both locally and by remote control. It offers programmability, stand-
alone operation, and robust, optically isolated communications with automation systems, utility control systems,
and personal computers. The RC-112B is equipped with a “cool blue” backlight display.
Electrical rating:
24 V; 3 A; 50/60 Hz
Maximum current:
2 A on any circuit, 3 A total
Thermostat operating current:
less than 15 mA
The following requirements must be observed for installation in Europe: CE
1.
This equipment must be installed in accordance with National wiring rules for the country in which it is
installed.
2.
Fuses must be replaced only with IEC rated components.
3.
All product labels, instructions and markings relating to safety must be translated to a language, which is
acceptable in the country in which this equipment is to be installed.
INSTALLATION
Before installing this thermostat:
1.
Read all of the installation instructions carefully.
2.
Read the Owner's Manual carefully.
3.
Ensure that this product is suitable for your application.
4.
Ensure that wiring complies with all codes and ordinances.
5.
Disconnect power to the control transformer to prevent electrical shock and damage to equipment.
6.
Select an appropriate location to ensure an accurate temperature reading.
Location
When replacing an existing thermostat, install the RC-112 in the same location. If the existing location doesn't
meet the following criteria, choose a new location. When choosing a location for the thermostat:
Document Number 13I00-5 / Rev B / May, 2004
Copyright
1999-2004 Home Automation, Inc.
All Rights Reserved
Summary of Contents for OMNISTAT RC-112
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