Y1 DEMAND
LOW |
| |
PRESSURE | CLOSED | |
SWITCH (S87) | ||
|
COMPRESSOR CONTACTOR ENERGIZED
INITIAL TRIP
SWITCH IS
IGNORED FOR 90 SECONDS
OPEN
OPEN
COMPRESSOR CONTACTOR DE−ENERGIZED
COMPRESSOR ANTI−SHORT CYCLE TIMER BEGINS
INCREMENT
5−STRIKE
COUNTER1
LED ALERT
CODE / OR
MODERATE
ALERT 410
DISPLAYED
ANTI−SHORT CYCLE TIMER ENDS
COMPRESSOR CONTACTOR ENERGIZED
LOW |
|
|
|
| SWITCH IS CLOSED OR OUTDOOR |
PRESSURE |
|
|
|
| |
| CLOSED |
|
| ||
SWITCH (S87) |
|
|
| AMBIENT TEMPERATURE IS 15ºF | |
|
|
|
| ||
|
|
|
|
| OR BELOW |
|
|
|
|
|
|
1If 5−strike counter has four or less strikes when Y1 demand is terminated 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.
2Lockouts can be reset by either cycling power off to the heat pump con- trol’s (A175) R terminal, or placing a jumper on the field test pins (E33) between 1 to 2 seconds.
5−STRIKE
COUNTER
REACHES 5
WITHIN A SINGLE
Y1 DEMAND
LOW
PRESSURE
SWITCH (S87)
LOCKOUT
LED ALERT
CODE / OR
SERVICE
CRITICALREQUIRED2
ALERT 411
DISPLAYED
SERVICE
REQUIRED2
OPEN
LOW
PRESSURE SWITCH (S87)
WAITING FOR PRESSURE SWITCH TO CLOSE
LED ALERT
CODE / OR
CLOSEDMODERATE ALERT 410
DISPLAYED
CLOSED
NORMAL
OPERATION
Figure 28. Low Pressure (S87) Switch Operation
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