Emerson 1HDEZ-1521 installation instructions Equipment Control Terminals Operation / Function, HM2

INSTALLATION

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	Dehumidification Relay / Connection
DHM2	Dehumidification Relay / Connection
HM	Humidification Relay / Connection
HM2	Humidification 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 configuration hook-up with RJ11
	equipped configuration tool
+	Voltage to Outdoor Sensor
S	Outdoor Sensor Temperature Signal
-	Voltage to Outdoor Sensor

*For 2 transformer systems, cut and tape off 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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