12
1
2
R
C
Air Handler
Integrated Control Module
Typical Single-Stage Cool,
Single-Stage Heat
Heat Pump Thermostat
Dehumidistat
[Optional]
G
W1 W2
Y1
Y2
O
DE HUM
Remote Condensing Unit
(Single-Stage HP)
NEU
HOT
W/E
R
C G
Y1
O
R
C
W1
Y
O
Typical Single-Stage Heat Pump with Auxiliary/Emergency
Heating
1
2
R
C
Air Handler
Integrated Control Module
Typical Two-Stage Cool,
Two-Stage Heat
Heat Pump Thermostat
Dehumidistat
[Optional]
G
W1 W2
Y1
Y2
O
DE HUM
Remote Condensing Unit
(Two-Stage HP)
NEU
HOT
W/E
R
C G
W2
Y1
Y2
O
R
C
W1
Y1
Y2
O
Typical Two Stage Heat Pump heating and Auxiliary/
Emergency Heating
24 V
OLT
D
EHUMIDISTAT
W
IRING
- N
ON
-C
OMMUNICATING
T
HERMOSTAT
C
ONNECTIONS
The optional usage of a dehumidistat allows the air handler’s
circulator blower to operate at a slightly lower speed during a
combined thermostat call for cooling and dehumidistat call
for dehumidification. This lower blower speed enhances de-
humidification of the conditioned air as it passes through the
AC coil. For proper function, a dehumidistat applied to this
air handler must operate on 24 VAC and utilize a switch which
opens on humidity rise.
To install/connect a dehumidistat:
1. Turn OFF power to air handler.
2. Secure the dehumidistat neutral wire (typically the white
lead) to the screw terminal marked “DEHUM” on the air
handler’s integrated control module.
3. Secure the dehumidistat hot wire (typically the black
lead) to the screw terminal marked “R” on the air
handler’s integrated control module.
4. Secure the dehumidistat ground wire (typically the green
lead) to the ground screw on the air handler.
NOTE:
Ground wire may not be present on all dehumidistats.
5. To enable the dehumidification function, move the de-
humidification dip switch (S7) from OFF to ON. See
following figure.
6. Turn ON power to air handler.
ON
OFF
Move to the
ON position
to enable
dehumidification
S5 S6 S7 S8
Dip Switches - Dehumidification Enable
A
UXILIARY
A
LARM
S
WITCH
The control is equipped with two Auxiliary Alarm terminals
labeled CAS which can be utilized with communicating mode
setups (typically used for condensate switch wiring but could
be used with compatible C0
2
sensors or fire alarms).
Legacy mode use
In a legacy system (Non-communicating), this feature is not
operational. Any auxiliary alarm switch must be used to in-
terrupt the Y1 signal either to the indoor or outdoor unit.
CAS
SWITCH
Communication mode use
This feature can be activated or deactivated through the
thermostat user menus. An auxiliary alarm switch must be
normally closed and open when the base pan’s water level
in the evaporator coil reaches a particular level. The con-
trol will respond by turning off the outdoor compressor and
display the proper fault codes. If the switch is detected
closed for 30 seconds, normal operation resumes and the
error message will be removed.
AVPTC M
OTOR
O
RIENTATION
If the unit is in the upflow position, there is no need to rotate
the motor. If the unit is in the downflow position, loosen mo-
tor mount and rotate motor as shown in the
AVPTC Motor
Orientation
figure below.
Be sure motor is oriented with the
female connections on the casing down. If the motor is not
oriented with the connections down, water could collect in
the motor and may cause premature failure.
FEMALE CONNECTIONS
SIDE VIEW
W
A
RN
IN
G
SO
F
T
W
A
RE
VER
.
TO
P
FRONT VIEW
AVPTC Motor Orientation
