Troubleshooting
4-76 Samsung Electronics
: Comp. Down due to Low Pressure Protection Control (cont.)
Is the S-net
estimated value and the
Manifold Gauge value in range?
When heating operation
temperature and the quantity is within
the normal range?
Are the Indoor Unit and Outdoor
Unit EEV normally opera
ting?
Are there any blockage inside
the pipe? (filter etc.)
Check the refrigerant amount.
Is there any leakage in
the Liquid Pipe Valve or the discharge check
valve of the not-go-end Outdoor Unit when only
some Outdoor Units
are operating?
Auto Trial Operation
Open the Service Valve
Replace Low Pressure sensor
Check the water pipes
Check the relevant EEV
Pipe inspection
Replace relevant component
Yes
Yes
Yes
Yes
No
Are all service valves open?
Connect S-net and Manifold Gauge.
(essential requirement)
No
No
No
Yes
Yes
Yes
1. How to check
No
Outdoor unit display
(
Water Cooled
)
Indoorunit display
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation
Defrost TimerFan Filter/MPI
Operation
Defrost Timer Filter
Operation
TimerTurbo
××◑◑◑×◑◑◑
●
◑◑
※ ● :
ON
◑ :
Flash
×:
OFF
Judgment Method
Inspection when the value of low pressure sensor is 2.6kg/cm², or less for air conditioning and 1.4kg/cm² for heating.
Cause of problem
Refrigerant shortage
Electronic expansion valve blocked
Low pressure sensor defective
Low pressure sensor defective
Leakage of compressor discharge check valve of not-go-end outdoor unit
Error m
ay be found when used in temperature range outside the conditions of use
(Operating outside temperature at -20°C or less for heating and operating outside temperature at -5°C or less for Cooling)
When heating
operation, if the water temperature and quantity are below the normal range.
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