Lennox LCH036 Installation Instructions Manual page 11

FIELD WIRING WITH ELECTRONIC AND ELECTRO-MECHANICAL THERMOSTATS
24 V POWER
TO UNIT CONTROLLER
THERMOSTAT INPUTS
R
C
2
G
W1
S86
B
W2
Y1
A
ALL OTHER
Y2
SIGNALS REMAIN CONNECTED
AS SHOWN ON THE RIGHT.
OCP
TO PROVIDE SUPERMARKET REHEAT SCHEME
USE S86 DEHUMIDISTAT AND K55.
FIELD WIRING IN ZONE SENSOR MODE
(Zone Sensor Mode)
UNIT CONTROLLER
SENSOR
24VAC
SENSOR
IAQ
R C
AI1
HUM
A2 SENSOR
FIGURE 15
C-Hot Gas Reheat Units Only -
1- Install humidity sensor
instructions provided with sensor. A DDC input may
be used to initiate dehumidification instead of a
sensor.
2- Make wiring connections as shown in figure 14 for
Thermostat Mode or figure 15 for Zone Sensor
Mode. In addition, connect either a humidity
sensor or a dehumidification input. See figure 16
or 17 for humidity sensor wiring or figure 18 for
dehumidification input wiring.
LGH/LCH036, 048, 060, 072
(Thermostat Mode)
TO R
2
7
TO G
K55−1
5
TO Y1
THERMOSTAT
OUTPUTS
TMP D01 D02
J298
in accordance with
J297A
1
R
2
C
B
3
G
4
W1
5
W2
6
2 Y1
7
Y2
8
OCP
C
9
10
FIGURE 14
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 16.
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 16.
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 17. Use two shielded cables
containing 20AWG minimum, twisted pair conductors
with overall shield. Belden type 8762 or 88760 (plenum)
or equivalent.
Page 11
P297
A55
W1
W2
10
11
12