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Y1 DEMAND
PRESSURE
OR COOLING
SWITCH (S4)
DEMAND
CONTACTOR
DE-ENERGIZED
OPEN
ANTI-SHORT
CYCLE TIMER
BEGINS
INCREMENT
5-STRIKE
COUNTER
LED ALERT
CODE / OR
MODERATE
ALERT 412
DISPLAYED
ANTI-SHORT
CYCLE TIMER
PRESSURE
SWITCH (S4)
SERVICE
2
REQUIRED
WAITING FOR
PRESSURE
OPEN
SWITCH TO
Figure 32. High Pressure Switch (S4) Sequence of Operation (All Versions)
HIGH
CLOSED
HIGH
PRESSURE
OPEN
SWITCH (S4)
The thermostat terminates demand when the contactor is
1.
de-energized. If demand is satisfied when alarm is not active, the
5-strike counter resets.
2.
Lockouts can be reset by cycling power off to the outdoor control
(A175) R terminal.
WITHIN A SINGLE
1
ENDS
HIGH
CLOSED
CLOSED
CLOSE
TOP CAP
SWITCH (S173)
CLOSED
5-STRIKE
COUNTER
REACHES 5
Y1 DEMAND
HIGH
PRESSURE
SWITCH (S4)
LOCKOUT
LED ALERT
CODE / OR
CRITICAL
ALERT 413
CLEARED
LED ALERT
CODE / OR
MODERATE
ALERT 412
DISPLAYED
CONTACTOR
CLOSED
ENERGIZED
SERVICE
2
REQUIRED
NORMAL
OPERATION
31-5000750 Rev. 1
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