Lennox Signature XP21 Series Installation And Service Procedure page 81

Y1 DEMAND
COMPRESSOR
CONTACTOR
ENERGIZED
W OUTPUT
YES
COMPRESSOR
CONTACTOR
DE−ENERGIZED
W OUTPUT
YES
ACTIVE)
NO
COMPRESSOR
ANTI−SHORT
CYCLE TIMER
BEGINS
INCREMENT
5−STRIKE
1
COUNTER
LED ALERT
CODE / OR
MODERATE
ALERT 418
DISPLAYED
ANTI−SHORT
CYCLE TIMER
ENDS
LED ALERT
CODE / OR
1
If 5−strike counter has four or less strikes when Y1 demand is terminated or satisfied,
MODERATE
the strike counter will reset to zero. In a comfort
ALERT 418
CLEARED
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 heat pump control's (A175)
R terminal, or placing a jumper on the field test pins (E33) between 1 to 2 seconds.
Figure 47. W Input Fault or Miswire Sequence of Operation (All Versions)
NO
ACTIVE)
COMPRESSOR
ANTI−SHORT
CYCLE TIMER
BEGINS
5−STRIKE
COUNTER
REACHES 5
WITHIN A SINGLE
Y1 DEMAND
W OUTPUT
HARDWARE
FAULT
LOCKOUT
LED ALERT
CODE / OR
CRITICAL
ALERT 419
DISPLAYED
Page 81
INITIAL TRIP
SWITCH IS
IGNORED FOR
90 SECONDS
LED ALERT
CODE / OR
MODERATE
ALERT 418
DISPLAYED
ANTI−SHORT
CYCLE TIMER
ENDS
W OUTPUT
NO
ACTIVE)
YES
WAITING FOR
W OUTPUT TO
DEACTIVATE
SERVICE
2
REQUIRED
®
enabled setup, the thermostat will
NORMAL
OPERATION
LED ALERT
CODE / OR
MODERATE
ALERT 418
CLEARED
XP21