GE CC-SCSTAT User Manual download pdf (Page 39)

Control unit wiring

Figure 21 shows the control unit wired to a wall display unit and the HVAC system. Wire colors are typical

thermostat wiring colors. The fuse is a mini ATO 2 amp.

Note: For heat pump HVAC systems, the orange wire (O) is the changeover valve.

Figure 21. Control unit wiring

HVAC system transformer

Most central HVAC systems have a common heating and cooling transformer. This is the factory default

setting for jumper JP1. In some cases you may have separate heating and cooling systems, each with their own

transformer. In that case, cut jumper JP1 and wire the heating transformer red wire to the RH terminal and the

cooling system transformer red wire to the RC terminal. Wire the cooling system’s 24 VAC Com to the control

unit’s 24 VAC Com terminal. Do not connect the heating system’s common wire to the control unit.

Wall display unit

J1 WDU

J2 RS-485

GND

+12VDC

Clock

Data

GND

12V

GND

D+

D-

Status

Heat 1

Heat 2

Fan

Comp 1

Comp 2

JP1

Fuse

Control unit

HVAC system

24V COM

24V RH

24V RC

W2/O

Blue

Red

White

Orange

Green

Yellow

Black

C-24VAC common

R-24VAC return

W1-Heat stage 1

W2/O-Heat stage 2

G-Fan

Y1-Comp stage 1

Y2-Comp stage 2

SW1

STD

OFF ON

J4 HVAC system

GND

RS-485 Data +

RS-485 Data -

1 2 ... 34 35 36 37 38 39 40 41 42 43 44

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GE CC-SCSTAT User Manual Page 39

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