Lennox LHT078H Installation Instructions Manual page 13

3- Connect thermostat wiring to Unit Controller on the
lower side of the controls hat section.
4- Wire as shown in figure 15 for electro-mechanical
and electronic thermostats.
temperature control devices or energy management
systems see instructions and wiring diagram
provided by manufacturer.
IMPORTANT-Terminal connections at the Unit Controller
must be made securely. Loose control wire connections
may allow unit to operate but not with proper response to
room demand.
24 VOLT FIELD WIRING IN THERMOSTAT MODE
24 V POWER
J297A
1
R
2
C
B
3
G
4
W1
5
W2
6
Y1
7
Y2
8
OCP
C
9
10
FIGURE 15
If using
P297
A55
W1
W2
D
Zone Sensor Mode
The Unit Controller will operate heating and cooling
based on the Unit Controller internal setpoints and the
other
temperature from the A2 room sensor. An optional
Network Control Panel (NCP) can also be used to provide
setpoints. A thermostat or return air sensor can be used
as a back-up mode. Make room sensor wiring
connections as shown in figure 16.
FIELD WIRING IN ZONE SENSOR MODE
24VAC
10
R C
11
12
Page 13
(Zone Sensor Mode)
UNIT CONTROLLER
SENSOR
SENSOR INPUTS
IAQ
AI1 HUM
TMP
AI2
A2 SENSOR
FIGURE 16
C R
J298