Lennox XP17-024-230-01 Installation And Service Procedure page 54

Y1 DEMAND
SWITCH (S4)
COMPRESSOR
CONTACTOR
DE-ENERGIZED
OPEN
COMPRESSOR
ANTI-SHORT
CYCLE TIMER
ANTI-SHORT
CYCLE TIMER
COMPRESSOR
CONTACTOR
ENERGIZED
SWITCH (S4)
SERVICE
2
REQUIRED
WAITING FOR
OPEN
XP17
HIGH
PRESSURE
CLOSED
HIGH
PRESSURE
OPEN
SWITCH (S4)
1
If 5-strike counter has four or less strikes when Y1 demand
is terminated or satisfied, the strike counter will reset to
zero. In a iComfortt-enabled thermostat enabled setup,
the thermostat will terminate demand when the compressor
contactor is de-energized. If demand is satisfied when
alarm is not active, the 5-strike counter will reset.
2
Lockouts can be reset by either cycling power off to the
BEGINS
heat pump control's (A175) R terminal, or placing a jumper
on the field test pins (E33) between 1 to 2 seconds.
INCREMENT
5-STRIKE
1
COUNTER
LED ALERT
CODE / OR
MODERATE
ALERT 412
DISPLAYED
ENDS
HIGH
PRESSURE
CLOSED
PRESSURE
CLOSED
SWITCH TO
CLOSE
Figure 31. High Pressure Switch (S4) Sequence of Operation
COMPRESSOR
CONTACTOR
ENERGIZED
CLOSED
5-STRIKE
COUNTER
REACHES 5
WITHIN A SINGLE
Y1 DEMAND
HIGH
PRESSURE
SWITCH (S4)
LOCKOUT
LED ALERT
CODE / OR
CRITICAL
ALERT 413
CLEARED
LED ALERT
CODE / OR
MODERATE
ALERT 412
DISPLAYED
Page 54
SERVICE
2
REQUIRED
NORMAL
OPERATION