3DJH
31-5000750 Rev. 1
Figure 31. Low Pressure Switch (S87) Sequence of Operation (All Units)
Y1 DEMAND
OR COOLING
DEMAND
LOW
PRESSURE
CLOSED
(S87)
CONTACTOR
ENERGIZED
SUCTION
PRESSURE
CUT-OUT IS
IGNORED FOR
90 SECONDS
LOW PRESSURE
(S87)
CONTACTOR
DE-ENERGIZED
ANTI-SHORT
CYCLE TIMER
BEGINS
INCREMENT
5-STRIKE
COUNTER
1
LED ALERT
CODE / OR
SERVICE SOON
ALERT 410
DISPLAYED
ANTI-SHORT
CYCLE TIMER
ENDS
CONTACTOR
ENERGIZED
WAITING FOR
PRESSURE
TO RISE ABOVE
40 PSIG
OUTDOOR AMBIENT
TEMPERATURE IS 15ºF
OR BELOW
SWITCH IS CLOSED OR
3
5-STRIKE
COUNTER
REACHES 5
WITHIN A SINGLE
Y1 DEMAND
LOW
PRESSURE
LOCKOUT
LED ALERT
CODE / OR
SERVICE URGENT
ALERT 411
DISPLAYED
SERVICE
REQUIRED
2
LED ALERT
CODE / OR
SERVICE SOON
ALERT 410
DISPLAYED
SERVICE
REQUIRED
2
NORMAL
OPERATION
CLOSED
CLOSED
OPEN
OPEN
OPEN
CLOSED
CLOSED
1.
The thermostat terminates demand when the contactor
is de-energized. If demand is satisfied when alarm is
not active, the 5-strike counter resets.
2.
door control (A175)
R
terminal.
3.
The low pressure switch is ignored when
the outdoor temperature is below 15°F.
LOW PRESSURE
SWITCH
S87
NO
Содержание GE NS22HM
Страница 7: ...3DJH 31 5000750 Rev 1 Figure 2 Component Locations NS22H24MA4 and NS22H36MA4...
Страница 8: ...3DJH 31 5000750 Rev 1 Figure 3 Component Locations NS22H48MA4 and NS22H60MA4 Scroll Compressor Models...
Страница 58: ...3DJH 31 5000750 Rev 1 24 AND 36 HP MODEL Figure 24 Wiring Diagram Unit Wiring Diagram...
Страница 78: ...3DJH 31 5000750 Rev 1 24 AND 36 HP MODEL Figure 45 VAC Voltage Check...
Страница 103: ...3DJH 31 5000750 Rev 1 Figure 54 NS22H24M NS22H36M Charging Label...
Страница 104: ...3DJH 31 5000750 Rev 1 Figure 55 NS22H48M NS22H60M Charging Label...
Страница 105: ...3DJH 31 5000750 Rev 1 Notes...
