Comp. Down Due To Low Pressure Protection Control - Samsung AM080FXWANR Service Manual

Troubleshooting
4-3 Appropriate Measures for Different Symptom (cont.)
4-3-32

: Comp. Down due to Low Pressure Protection Control

Outdoor unit
display
Duct, Cassette (1/2 Way),Console, Celing
Operation
Indoorunit
display
×
※ ● : ON ◑ : Flash ×: OFF
Judgment ∙ Judgment Method : Inspection when the value of low pressure sensor is 1.8kg//cm², or less for
Method
air conditioning and 0.8kg/cm² for heating
∙ Refrigerant shortage
∙ Electronic expansion valve blocked
∙ Service valve blocked
Cause of
∙ Low pressure sensor defective
problem
∙ Discharge check valve leaking on outdoor unit that is off
∙ 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)
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 leaking on outdoor unit that is off 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
Gauge value in 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
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 relevant EEV
Pipe inspection
Replace relevant component
Turbo
◑ ◑
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