Specification

Wiring
Wiring Diagrams
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Heat Pump System and Steam Humidifier with Combo Thermostat/Humidstat and Isolating Relay
Heat Pump System and Steam Humidifier with 072000 Humidistat
S2000 & S2020 Humidifier Low Voltage Terminal Block
Heat Pump System and Steam Humidifier with 072000 Humidistat
OD OD C
R
H
H
Outdoor
Temperature
Sensor
072000 Humidistat
Refer to the 072000 Technical Bulletin
Typi cal A ir Handler
G1 R G2 HH
Typical Heat Pump
Thermostat
G Y
W2
R
A
A
REMOVE
FACTORY
JUMPER
C
O
G Y
W2
R C
O
Outdoor Heat Pump
not shown for clarity
Model APD or
Equivalent
Humidistat
Green
White
Red
Orange
Yellow
Green
Red
Green
S2000 & S2020 Humidi f ier
Low Voltage Terminal Block
Black Black
Heat Pump System and Steam Humidifier with Combo Thermostat/Humidstat and Isolating Relay
Typical A i r Handl er
G1 R G2 HH
Thermostat with built-in
Humidi f ication Control
A
A
REMOVE
FACTORY
JUMPER
H
Outdoor Heat Pump
not shown for clarity
SPST Dry Contact
I sol at i ng Rel ay
wi th 24vac Coi l
Model APD or
Equivalent
G Y
W2
R C
O
Humidistat
White
Red
Orange
Yellow
Green
Red
Green
S2000 & S2020 Humidi f ier
Low Voltage Terminal Block
G Y
W2
R C
O
Black Black
HH
A
A
Disconnect the wires from the “A”
terminals and check the device & circuit
with a reliable ohm meter. Check continuity
when the fan is off and when it is running.
Model APD current
sensing switch or
equivalent air pr oving
device. Dr y Contacts Close
when fan is r unning!
00.3
OHM
S2000 & S2020 Humidi fier
Low Voltage Terminal Block
Green 1 Green 2
Red
for Steam Humidifier