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Sample Wiring Configuration
WARNING! Do not install LINE VOLTAGE wires to a
LOW VOLTAGE wire.
IMPORTANT! Do not install any wire to one of the TS
terminals (leading to a remote sensor) other than
supported external temperature sensors (Flush Mount
Remote Temperature Sensor, Aprilaire Model 8051;
or Duct/Outdoor Remote Temperature Sensor,
Aprilaire Model 8052).
NOTE: Install jumper wire between RC and RH for a
single stage system.
Connections for Heating, Cooling and Fan
Pin
1
2
Code
RH
RC
Color
Black
Red
24VAC Primary
24VAC Second
Conventional
Stage Source
Stage Source
(Heat)
(Cool)
HVAC
Type
24VAC Primary
24VAC Second
Heat Pump
Stage Source
Stage Source
(Heat)
(Cool)
Single Stage, Single Transformer
Single Stage, Single Transformer
3
4
5
6
B
G
Y1
Y2
Blue
Green
Yellow
Yellow
Air
Air
Conditioning
Conditioning
Damper
Fan Relay
Compressor
Compressor
Control (Heat)
Control First
Control 2nd
Stage
Stage
Changeover
Heat Pump
Heat Pump
Fan Relay
Valve (Heat)
Primary Stage
Second Stage
Conventional Systems
Dual Stage, Dual Transformer
Heat Pump Systems
Dual Stage, Dual Transformer
7
8
9
10
W1
W2
O
TS
White
White
Orange
Furnace
Remote NTC
Furnace
Damper
Control 2nd
Temperature
Control
Control (Cool)
Stage Heat
Sensor
Remote NTC
Heat Pump
Changeover
Auxiliary Heat
Temperature
Fourth Stage
Valve (Cool)
Sensor
11
TS
Remote NTC
Temperature
Sensor
Remote NTC
Temperature
Sensor
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