Low Pressure Protection Control - Samsung AVMKH020EA0 Service Manual

8-2-74. Low pressure protection control

Outdoor unit display
Indoor unit display
Judgment method
Causes
Is the service vale opened all?
Check the PWM valve coil
(The same condition with that
Cooling
Check the indoor unit EEV
open and the heat exchanger
inlet/outlet temperature.
Check if the indoor fan is
operated normally.
Is high/low pressure normal?
(Operation) (Timer)
- It is detected when the value of low pressure sensor is below 0.7kg/cm
- 0.2kg/cm 2 on heating.
<Cooling operation>
- Shortage of refrigerant/EEV clogging s/valve clogging/Unloading defect of compressor
<Heating operation>
- Shortage of refrigerant/EEV clogging s/valve clogging/Unloading defect of compressor/Operated in
the condition of outdoor temperature -20˚C below
Error reset(KEY3)
Yes
and connecter.
Yes
Test operation
error occurred)
Heating
Check the outdoor unit EEV
open and the compressor
discharge temperature.
Check if the outdoor fan is
operated normally.
Yes
Check completion
- 255 -
(Fan) (Filter) (Removing frost)
No
Open the service valve.
No
Check the Coil attaching and the
connection of connecter.
S-net connection (Essential)
Check the quantity of refrigerant
No
Operate the indoor/outdoor EEV
Check the EEV clogging
Troubleshooting
on cooling, and
2