Installation

Wiring terminal

C B O Y Y2 G RC R W2 W L S2 S1 T1 T2

Wire specifications:

18-24 gauge thermostat wire

Installation notes:

Ensure power at the HVAC equipment is off.

Loosen screw terminals, insert stripped wire and re-tighten..

Push the excess wire back into the opening and plug the wall opening to prevent drafts.

C – Common (optional when powered by batteries) B – Reversing valve1

O – Reversing valve1

Y – 1st stage cooling / compressor

Y2 – 2nd stage cooling / compressor G – Fan

RC – 24VAC supply cooling2 R – 24VAC supply heating2

W2 – 2nd stage heat / auxiliary W – 1st stage heat / auxiliary

L – System fault indicator (optional) (heat pump only) S1 & S2 – outdoor temperature sensor (optional)

T1 & T2 – remote temperature sensor (optional)

1O and B terminals are both de-energized when system mode is OFF or in AUTO when the heating and cooling equipment is idle.

2Jumper between RC & R is used in single transformer systems (see wiring diagrams).

CONVENTIONAL HEAT/COOL

Single transformer (use Jumper wire)

Two transformers (Remove Jumper Wire)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOT USED

NOT USED

 

 

 

 

 

 

COOLING

COOLING

FAN

1st

2nd

 

 

 

 

 

 

 

 

 

 

 

 

 

 

JUMPERTRANSFORMER

2nd HEATING 1st HEATING

OUTDOOR TEMP SENSOR

REMOTE TEMP SENSOR

NOT USED

NOT USED

NOT USED

 

 

 

 

 

 

COOLING

COOLING

FAN

1st

2nd

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COOLING TRANSFORMER

TRANSFORMER

HEATING

2nd HEATING 1st HEATING

OUTDOOR TEMP SENSOR

REMOTE TEMP SENSOR

NOT USED

C B O Y Y2 G RC R W2 W L S2 S1 T1 T2

C B O Y Y2 G RC R W2 W L S2 S1 T1 T2

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Aprilaire 8600 installation instructions Wiring terminal, Wire specifications, Installation notes, Conventional HEAT/COOL

8600 specifications

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