Lennox LCT240H User Manual

Page 50
LGT/LCT156, 180, 210, 240, 300
F-Compressor Controls
See unit wiring diagram to determine which controls are
used on each unit.
1- High Pressure Switch (S4, S7, S28, S96)
The compressor circuit is protected by a high
pressure switch which opens at 640 psig +
10 psig
(4413 kPa +
70 kPa) and automatically resets at 475
psig +
20 psig (3275kPa + 138 kPa).
2- Low Pressure Switch (S87, S88, S97, S98)
The compressor circuit is protected by a low
pressure switch. Switch opens at 40 psig +
5 psig
(276 +
34 kPa) and automatically resets at 90 psig
+ 5 psig (621 kPa + 34 kPa).
3- Crankcase Heater (HR1, HR2, HR5, HR11)
Units have compressors which contain a belly band
compressor oil heater which must be on 24 hours before
running compressors. Energize by setting thermostat so
that there is no cooling demand, to prevent compressor
from cycling, and apply power to unit.
4- Thermal Protector (S5)
Each fixed-speed compressor is protected by an
internal thermal protector switch.
5- Condenser Fan Operation
156
Condenser fan 1, 2, and 3 are energized when
compressor 1 or 2 are energized. See figure 21.
Condenser fans 1 and 2 are de-energized when
outdoor temperature drops below 62°F (17°C).
Condenser fan 3 modulates to maintain target liquid
temperatures when outdoor temperature drops
below 62°F (17°C).
156 CONDENSER FANS
FIGURE 21
COND.
FAN 2
COND.
FAN 1
COND.
FAN 3
12
COMPRESSORS
180
Condenser fan 3 and 4 are energized when
compressor 1 is the ONLY compressor energized. As
cooling demand increases, all four condenser fans
are energized. See figure 22.
Condenser fans 1 and 3 are de-energized when
outdoor temperature drops below 62°F (17°C).
Condenser fans 2 & 4 modulate to maintain target
liquid temperatures when outdoor temperature drops
below 62°F (17°C).
180 CONDENSER FANS
FIGURE 22
COND.
FAN 4
COND.
FAN 3
COND.
FAN 1
COND.
FAN 2
123
COMPRESSORS
210
Condenser fans 1 and 2 are energized when
compressor 1 or 2 are energized. As cooling demand
increases, all four condenser fans are energized. See
figure 23.
Condenser fans 1 and 3 are de-energized when
outdoor temperature drops below 62°F (17°C).
Condenser fans 2 & 4 modulate to maintain target
liquid temperatures when outdoor temperature drops
below 62°F (17°C).
210 CONDENSER FANS
FIGURE 23
COND.
FAN 4
COND.
FAN 3
COND.
FAN 1
COND.
FAN 2
123
COMPRESSORS
4

Lennox LCT240H Specifications

General

Brand	Lennox
Model	LCT240H
Category	Air Conditioner
Language	English