Heat Pump Single Transformer; Heat Pump Two Transformer; Indoor Air Quality Wiring Diagrams; Indoor Air Quality Wiring With Separate Transformers - Aprilaire Home Comfort Control 8910W Safety & Installation Instructions

HVaC WIRInG DIaGRaMs
HeaT puMp sInGle TRansFoRMeR (use JuMpeR WIRe)
1
THERMOSTAT
2
3
HeaT puMp TWo TRansFoRMeR (ReMoVe JuMpeR WIRe)
1
THERMOSTAT
2
3
1
R and C can be
powered from the
HVAC equipment
transformer or any
other constantly
powered 24VAC
source.
8
C
R
HEAT PUMP TRANSFORMER
RC
RH
HC HP
W W 1 HEATING
st
W2 W2 2 HEATING
nd
W3 B REVERSING VALVE
Y Y 1 COMPRESSOR
st
Y2 Y2
2 COMPRESSOR
nd
Y3 O REVERSING VALVE
G G FAN
L FAULT DETECT
C
EQ
1
TRANSFORMER
C
R
HEAT PUMP TRANSFORMER
RC
RH
HEATING TRANSFORMER
HC HP
W W 1 HEATING
st
W2 W2 2 HEATING
nd
W3 B REVERSING VALVE
Y Y 1 COMPRESSOR
st
Y2 Y2 2 COMPRESSOR
nd
Y3 O REVERSING VALVE
G G FAN
L FAULT DETECT
C
EQ

InDooR aIR QualITy WIRInG DIaGRaMs

InDooR aIR QualITy WIRInG WITH sepaRaTe TRansFoRMeRs

HUM
DHnc
DH com
DH no
VNT
EAC
note: Outputs are 24VAC dry contact . Refer to individual product installation instructions for more details .

InDooR aIR QualITy WIRInG WITH a sInGle TRansFoRMeR

HUM
DH
nc
DH com
DH no
VNT
EAC
note: Outputs are 24VAC dry contact . Refer to individual product installation instructions for more details .
TRANSFORMER
HUMIDIFIER
DEHUMIDIFIER
TRANSFORMER
NORMALLY
CLOSED DAMPER
TRANSFORMER
PILOT RELAY FOR
120 VAC TO EAC
HUMIDIFIER
TRANSFORMER
DEHUMIDIFIER
NORMALLY
CLOSED DAMPER
PILOT RELAY FOR
120 VAC TO EAC
9