Wiring Terminal; Wiring Diagrams - Aprilaire 8400 Series Safety & Installation Instructions

INSTALLATION

WIRING TERMINAL

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 .
RC W Y
R
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RC – 24 VAC supply cooling*
R – 24 VAC supply heating*
W – 1st stage heat / auxiliary
Y – 1st stage cooling / compressor
G – Fan
C – RC 24VAC common (optional when powered by batteries)
S1 & S2 – outdoor temperature sensor (optional)
O/B – Reversing valve
L – System fault indicator
W2 – 2nd stage heat / auxiliary
Y2 – 2nd stage cooling / compressor
* Jumper between RC & R is used in single transformer systems
(see wiring diagrams).
G C S1 S2 O/B L W2 Y2
INSTALLATION
WIRING – MODEL 8463 & 8444 SINGLE
TRANSFORMER (USE JUMPER WIRE)
RC R W Y G C S1 S2
WIRING – MODEL 8463 & 8444 TWO
TRANSFORMERS (REMOVE JUMPER WIRE)
RC R W Y G C S1 S2
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