Hvac Wiring Diagrams; Heat Pump Single Transformer; Heat Pump Two Transformer; Indoor Air Quality Wiring Diagrams - Aprilaire 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 English
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
English 9