Comp. Down Due To Low Pressure Protection Control - Samsung AM056FN2DEH Series Service Manual

4-4-57

: Comp. Down due to Low Pressure Protection Control

Outdoor unit display
Indoor unit display
Criteria ∙ Inspection when the value of low pressure sensor is 0.8kg/cm², or less for air conditioning and 0.6kg/cm² for heating.
∙ Refrigerant shortage
∙ Electronic expansion valve blocked
∙ Service valve blocked
∙ Low pressure sensor defective
Cause of problem
∙ Leakage of compressor discharge check valve of not-go-end outdoor unit
∙ Error may be found when used in temperature range outside the conditions of use
1. Cause of problem
Are all service valves open?
estimated value and the Manifold
Are the Indoor Unit and Outdoor
Unit EEV normally operating?
Are there any blockage inside
the Liquid Pipe Valve or the discharge check
valve of the not-go-end Outdoor Unit when
Check the refrigerant amount.
Samsung Electronics
(Operating outside temperature at -20°C or less for heating and operating outside temperature at -5°C or less for
Cooling)
Commissioning
Yes
Is the S-net
Gauge value in range?
Yes
Yes
the pipe? (filter etc.)
No
Is there any leakage in
only some Outdoor Units
are operating?
No
Connect S-net and Manifold Gauge.
(essential requirement)
No
Open the Service Valve
No
Replace Low Pressure sensor
No
Check the relevant EEV
Yes
Pipe inspection
Yes
Replace relevant component
Troubleshooting
477