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