Blower Operation And Adjustments - Lennox LCH036 Installation Instructions Manual

FIELD WIRING WITH ELECTRONIC AND
ELECTRO-MECHANICAL THERMOSTATS
(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 11
2- Zone Sensor Mode
The Unit Controller will operate heating and cooling
based on the Unit Controller internal setpoints and
the temperature from the A2 zone 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 zone sensor
wiring connections as shown in figure 12.
Note - Install sensor and make communication wiring
connections as shown in literature provided with sensor.
FIELD WIRING IN ZONE SENSOR MODE
(Zone Sensor Mode)
UNIT CONTROLLER
SENSOR
24VAC
SENSOR
IAQ
R C
AI1
HUM
A2 SENSOR
FIGURE 12
P297
A55
W1
W2
OUTPUTS
TMP
D01 D02
J298
3- Third-Party Zoning -
The Unit Controller will operate up to four stages of
heating and cooling based on a third-party zoning
system. Only 4 inputs are required to control the
rooftop unit: G (blower enable), OCP (occupied), Y1
(enables discharge cooling) and W1 (enables
discharge heating). Make wiring connections as
10
shown in figure 13.
11
12
FOR UNITS WITH SUPPLY AIR VFD
UNIT
CONTROLLER
J297

Blower Operation and Adjustments

Units Equipped With A VFD - The blower rotation will
always be correct. Checking blower rotation is not a valid
method of determining voltage phasing for incoming
power.
Page 9
24 VOLT FIELD WIRING
24VAC
THERMOSTAT
R C
G W1 W2 Y1 Y2
24VAC
COMMON
VENTILATION
DEMAND
HEATING DEMAND
COOLING DEMAND
OCCUPIED DEMAND
FIGURE 13
G
L
O
OCP