Low Pressure Protection - GE ASH220NCDWA Service Manual

Low Pressure Protection

With the compressor running, if the low pressure switch opens for 1 minute, the compressor will stop.
If this condition occurs 3 times in an hour, the compressor will lock out and a low pressure error code will be displayed at the
indoor unit.
If the compressor is not running and the switch opens for 30 seconds, a low pressure error code will be displayed.
The low pressure switch does not stop compressor operation or signal an error code during the following conditions:
• The first 8 minutes of run time when the compressor starts a new cycle
• During defrost
• When the ambient temperature is below 32°F/0°C
• Following the termination of an oil return cycle
When any of the above 4 conditions are present, low pressure protection is provided by the coil temperature sensors in both
heating (Te) and cooling (Tc2) modes.
Low Pressure Protection in Cooling Mode:
Tc2
O O
-13 F(-25 C)
O O
-22 F(-30 C)
O O
-31 F(-35 C)
O O
-40 F(-40 C)
O O
-49 F(-45 C)
B-14
Operations
Operate normally
Min. running FQY 20Hz
LP OFF & FQY 20Hz
LP ON & FQY 20Hz
Raise FQY slowly 1Hz/10S
OUTDOOR TECHNICAL OVERVIEW
Low Pressure Protection in Heating Mode:
Te
O O
-22 F(-30 C)
O O
-31 F(-35 C)
O O
-40 F(-40 C)
O O
-49 F(-45 C)
O O
-58 F(-45 C)
Operate normally
Min. running FQY 20Hz
LP OFF & FQY 20Hz
LP ON & FQY 20Hz
Raise FQY slowly 1Hz/10S