Page 12
FIGURE 16
FIELD WIRING IN ZONE SENSOR MODE
(Zone Sensor Mode)
A2 SENSOR
INPUTS
SENSOR
SENSOR
24VAC
R
C
IAQ
HUM
AI1
AI2
TMP
R
UNIT CONTROLLER
J298
C
FIGURE 17
FIELD WIRING HOT GAS REHEAT UNITS
(Using A Dehumidification Switch)
7
10
8
9
R
DI
−
4
C
Use 24 VAC (R) from any terminal
available on J299
−
2,
−
5, or
−
7.
J299
DEHUMIDIFICATION
SWITCH
Humidity Sensor Cable Applications:
Wire runs of 50 feet (mm) or less:
Use two separate shielded cables containing 20AWG
minimum, twisted pair conductors with overall shield.
Belden type 8762 or 88760 (plenum) or equivalent.
Connect both cable shield drain wires to the Unit
Controller as shown in figure 18.
Wire runs of 150 feet (mm) or less:
Use two separate shielded cables containing 18AWG
minimum, twisted pair conductors with overall shield.
Belden type 8760 or 88760 (plenum) or equivalent.
Connect both cable shield drain wires to the Unit
Controller as shown in figure 18.
Wire runs over 150 feet (mm):
Use a local, isolated 24VAC transformer such as Lennox
cat #18M13 (20VA minimum) to supply power to RH
sensor as shown in figure 19. Use two shielded cables
containing 20AWG minimum, twisted pair conductors
with overall shield. Belden type 8762 or 88760 (plenum)
or equivalent.
FIGURE 18
FIELD WIRING HOT GAS REHEAT UNITS (Using A
Humidity Sensor With Less Than 150 Ft. Wire
Runs)
9
8
P298
J298A
1
2
B
3
4
C
5
6
7
D
10
A91
VIN
VO
GND
R
C
AI1
HUM
TMP
AI2
C
R
UNUSED
WIRE
NOT
CONNECTED
NOT
CONNECTED
DRAIN
A55 UNIT
CONTROLLER
FIGURE 19
FIELD WIRING HOT GAS REHEAT UNITS (Using
A Humidity Sensor With More than 150Ft. Wire
Runs)
ISOLATED 24V
TRANSFORMER
9
8
P298
J298A
1
2
B
3
4
C
5
6
7
D
10
A91
VIN
VO
GND
R
C
AI1
HUM
TMP
AI2
C
R
NOT
CONNECTED
NOT
CONNECTED
DRAIN
A55 UNIT
CONTROLLER
