Lennox Collection XC21 System Installation Instructions Manual page 34

Y1 DEMAND
OPEN
DISCHARGE
SENSOR (RT28)
IS AT OR
BELOW 225ºF
NO
506587−01
DISCHARGE
SENSOR
(RT28)*
OPEN
COMPRESSOR
1
COnTACTOR
If 5−strike counter has four or less strikes when Y1 demand is terminated
DE−ENERGIZED or satisfied, the strike counter will reset to zero. In a icomfort Touch
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.
COMPRESSOR
2
Lockouts can be reset by either cycling power off to the air conditioner
ANTI−SHORT
control's (A175) R terminal, or placing a jumper on the field test pins (E33)
CYCLE TIMER
between 1 to 2 seconds.
BEGINS
INCREMENT
5−STRIKE
1
COUNTER
LED ALERT
CODE / OR
MODERATE
ALERT 414
DISPLAYED
ANTI−SHORT
CYCLE TIMER
ENDS
YES
COMPRESSOR
COnTACTOR
ENERGIZED
WAITING FOR
TEMPERATURE
DROP TO OR
BELOW 225ºF
Figure 29. High Discharge Temperature (RT28) Sensor Operation
COMPRESSOR
CLOSED
COnTACTOR
ENERGIZED
HIGH
PRESSURE
CLOSED
SWITCH (S4)
5−STRIKE
COUNTER
REACHES 5
WITHIN A SINGLE
Y1 DEMAND
DISCHARGE
SENSOR (RT28)
LOCKOUT
LED ALERT
CODE / OR
CRITICAL
ALERT 415
CLEARED
LED ALERT
CODE / OR
MODERATE
ALERT 414
CLEARED
Page 34
*
If temperature is at or above 279ºF.
®
SERVICE
2
REQUIRED
NORMAL
OPERATIOn