12
15 Auxiliary Alarm Switch
The control is equipped with two Auxiliary Alarm terminals la-
beled 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 op-
erational. Any auxiliary alarm switch must be used to interrupt
the Y1 signal either to the indoor or outdoor unit.
Communication mode use
This feature can be activated or deactivated through the ther-
mostat user menus. An auxiliary alarm switch must be normally
closed and open when the base pan’s water level in the evapo-
rator coil reaches a particular level. The control 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.
CAS
SWITCH
Figure 19
16 AVPTC Motor Orientation
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 motor 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 connec-
tions down, water could collect in the motor and may cause pre-
mature failure.
FEMALE CONNECTIONS
SIDE VIEW
W
A
RN
IN
G
SO
F
TW
A
RE
VER
.
TO
P
FRONT VIEW
AVPTC Motor Orientation
Figure 20
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
DEHUM
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
Figure 17
14.2 24 Volt Dehumidistat Wiring - Non-Communicating
Thermostat Connections
The optional usage of a dehumidistat allows the air handler’s cir-
culator blower to operate at a slightly lower speed during a com-
bined thermostat call for cooling and dehumidistat call for dehu-
midification. This lower blower speed enhances dehumidification
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 inte-
grated 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 dehu-
midification dip switch (S7) from OFF to ON. See following
figure.
ON
OFF
Move to the
ON position
to enable
dehumidification
S5 S6 S7 S8
Dip Switches -
Dehumidification Enable
Figure 18
6. Turn ON power to air handler.
