Sinclair SCV-100EA, Руководство по обслуживанию

Страница: 80 / 109

P2: Low pressure protection
LED displays P2
Low pressure protection
Whether wiring connection between low pressure switch and PCB is
connected well or properly.
Whether the low pressure switch is damaged.
Connect well again.
Short-circuit low pressure switch and check whether the
system can work normally.
Whether the cooling system can work as normal.
YES
NO
Check whether the outdoor ambient temperature is too low.
YES
Stop the unit.
NO
Whether refrigerant system leaks.
YES
Leakage detecting: add nitrogen or refrigerant
into the system. “si”,”si” will sound evidently if
leaks heavily. Use soap water(the combination
of water and detergent ) or electronic detector
to detect if leaks slightly.
Replace outdoor main PCB.
NO
NO
YES
Replace low pressure switch .
Connect pressure gauge with the system measuring port.
Replace the EXV, then use high
pressure nitrogen to clean and air the
pipeline, add the refrigerant at last.
Whether EXV works properly or stuck or blocked
YES
NO
NO
NO
78