Samsung AM080FX A Series Service Manual page 178

Troubleshooting
4-3 Appropriate Measures for Different Symptom (cont.)
4-3-32 : Comp. Down due to Low Pressure Protection Control (cont.)
Outdoor unit
display
Duct, Cassette (1/2 Way),Console, Celing
Operation
Indoorunit
×
display
※ ● : ON ◑ : Flash ×: OFF
Judgment
∙ Inspection when the value of low pressure sensor is 2.6kg/cm², or less for air conditioning and 1.4kg/cm² for heating.
Method
∙ 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 (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.
1. Cause of problem
Are all service valves open?
estimated value and the
Manifold Gauge value in range?
When heating operation
temperature and the quantity is within
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
only some Outdoor Units
Check the refrigerant amount.
Samsung Electronics
( Water Cooled )
Defrost Timer Fan Filter/MPI
× ◑ ◑
Auto Trial Operation
Yes
Is the S-net
Yes
the normal range?
Yes
Yes
the pipe? (filter etc.)
No
Is there any leakage in
are operating?
No
Cassette (4/Mini4 Way)
Operation Defrost
◑ × ◑
No
No
No
Yes
Yes
Yes
Wall-mounted (NeoForte)
Timer Filter Operation Timer
◑ ◑ ●
Connect S-net and Manifold Gauge.
(essential requirement)
Open the Service Valve
Replace Low Pressure sensor
Check the water pipes
Check the relevant EEV
Pipe inspection
Replace relevant component
Turbo
◑ ◑
190