Comfort Plus Installation 2.12
Installation
Comfort Plus 12-Position Low Voltage Terminal Block Coding
O = Reversing Valve Input
O2 = Reversing Valve Output
E = Emergency Heat
OS = Outdoor Temperature Sensor
SC = Outdoor Temperature Sensor Common
RS = Freeze Protection Room Temperature Sensor
R = Low Voltage Hot
C = Low Voltage Common
Y = Compressor/Stage 1 Heat Call
W = Stage 2 Heat Call
Y2 = Compressor Output
G = Fan Call
ROOM THERMOSTAT
A low voltage room thermostat is required for room temperature control with the Comfort Plus. Any room
thermostat used with this system must be 24 VAC. (Contact the factory for more information on the thermostats
available from Steffes.)
Optimal placement of the room thermostat is on an interior wall in the main living area where it is not affected
by direct sunlight or other abnormal temperatures. A location near a cold air return may provide best air tem-
perature sampling.
Installing the Room Thermostat
Step 1 Disconnect power to the Comfort Plus and route low voltage wire between the thermostat and the
Comfort Plus system.
Step 2 Insulate the wall opening through which the thermostat wires run. Failure to do so may affect the
accuracy of the thermostat.
Step 3 Attach the thermostat to a wall. If installing a mechanical thermostat or thermostat with anticipator, a
resistor kit is required (Order Item #1190015).
Step 4 Route the low voltage wire into the electrical compartment of the Comfort Plus through one of its low
voltage wire knockouts and to the system's twelve (12) position low voltage terminal block.
Never install any wiring in the line voltage compartment of the Comfort Plus unless it is
rated for line voltage.
Step 5 Refer to the Room Thermostat Connections Diagrams (Figures 12 and 13) in this manual for proper
connections with regard to the application.
LOW VOLTAGE CONNECTIONS
HEAT PUMP APPLICATION
FIGURE 12
RLE
Aux
GO/BC Y R
Honeywell TH5220D
c
To Heat Pump
O - Reversing Valve
R - Low Voltage Hot
C - Low Voltage Common
Y - Compressor
Comfort Plus 12 Position Terminal Block
WGO2OC Y2YR
with Heat Pump
Terminals for Connection
E SCOS RS
Optional Freeze Protection
Room Sensor
Outdoor Sensor
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