Emerson 1HDEZ-1521 Thermostat User Manual


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6
INSTALLATION
Equipment Control Terminals Operation / Function
R ................................................ 24 VAC Transformer
RC .............................................. 24 VAC Cooling Transformer*
RH ............................................. 24 VAC Heating Transformer*
C ................................................ 24 V Transformer Common
W/E ............................................ Heating Stage 1 HP Aux/Em Heat Stage 1
W2 ............................................. Heating Stage 2 HP Aux/Em Heat Stage 2
Y ................................................ Compressor Stage 1
Y2 .............................................. Compressor Stage 2
G ................................................ Fan Relay
L Terminal .................................. System Monitor Compatible with
Comfort Alert Diagnostics
O/B Terminal .............................. Changeover Relay Heat Pump
DHM .......................................... Dehumidication Relay / Connection
DHM2 ........................................ Dehumidication Relay / Connection
HM ............................................. Humidication Relay / Connection
HM2 ........................................... Humidication Relay / Connection
R ................................................ 24 VAC to Interface
1 ................................................. Data to/from Interface
2 ................................................. Data to/from Interface
C ................................................ 24 VAC Common to Interface
RJ11 ........................................... Field conguration hook-up with RJ11
equipped conguration tool
+ ................................................. Voltage to Outdoor Sensor
S ................................................ Outdoor Sensor Temperature Signal
- ................................................. Voltage to Outdoor Sensor
Installation
*For 2 transformer systems, cut and tape o one transformer. If transformer
safety circuits are only in one of the systems, remove the transformer of the
system with NO safety circuits. If required, replace remaining transformer
with a 75 VA Class II transformer. After disconnecting one transformer, the
two commons must be jumpered together.
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