Unit Diagram - Lennox HS25–211 Servise Manual

VII–DIAGRAMS / OPERATING SEQUENCE
A–Unit Diagram
4

UNIT DIAGRAM

2
3
1
Page 10
B–Operation Sequence
1– WARNING–HS25 units using single–pole
contactors: Capacitor terminal "COM,"
orange condenser fan wire and red "R"
compressor wire are all connected to L2
at all times. Remove all power at discon-
nect before servicing.
2– Cooling demand energizes thermostat
terminal Y. Voltage from terminal Y
passes through discharge temperature
sensor (compressor thermostat) and low
pressure switch to energize time delay
terminal 2.
3– Time delay action is at the beginning of a
thermostat demand. When energized,
time delay TD1–1 delays 8.5 seconds be-
fore energizing TD1–1 terminal 3. When
TD1–1 terminal 3 is energized, the con-
tactor coil is energized.
4– When compressor contactor is ener-
gized, N.O. contacts close to energize
compressor terminal "C" (black wire)
and black condenser fan motor wire.
Condenser fan and compressor immedi-
ately begin operating.