Aprilaire 8400 series - Operation: All Models; Select System Mode; Change Temperature Setting

6
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.
INSTALLATION
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).
C
G
Y
W
R
L
S1
S2
O/B
W2
Y2
RC
61000652C 8400 Tstat Install.indd 6 10/13/09 11:08:58 AM