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OUTDOOR TECHNICAL OVERVIEW
B-14
ENGLISH
Operations
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 rst 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.
Operate normally
Min. running FQY 20Hz
LP OFF & FQY 20Hz
LP ON & FQY 20Hz
Raise FQY slowly 1Hz/10S
-49
O
F(-45
O
C)
Tc 2
-40
O
F(-40
O
C)
-31
O
F(-35
O
C)
-22
O
F(-30
O
C)
-13
O
F(-25
O
C)
Low Pressure Protection in Heating Mode:
Operate normally
Min. running FQY 20Hz
LP OFF & FQY 20Hz
LP ON & FQY 20Hz
Raise FQY slowly 1Hz/10S
-49
O
F(-45
O
C)
Te
-40
O
F(-40
O
C)
-31
O
F(-35
O
C)
-22
O
F(-30
O
C)
-58
O
F(-45
O
C)
Low Pressure Protection in Cooling Mode:
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