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

INSTAllATION

wIRINg TERmINAl

wire specifications
18-24 gauge thermostat wire
Installation notes
• E nsure power at the HVAC equipment is off.
• L oosen screw terminals, insert stripped wire and
re-tighten.
• P ush the excess wire back into the opening and plug
the wall opening to prevent drafts.
6
61000652C 8400 Tstat Install.indd 6
RC R W Y G C
RC – 24 VAC supply cooling*
R – 24 VAC supply heating*
w – 1st stage heat / auxiliary
Y – 1st stage cooling / compressor
g – Fan
C – 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).
S1 S2 O/B L W2 Y2
10/13/09 11:08:58 AM