LG ACHH Series Installation Manual page 18

TROUBLESHOOTING
18
Symptom
Insufficient refrigerant
Evaporation
pressure is
low and the
product
Insufficient cold water
constantly
stops.
Condensation
Outdoor temperature is high
pressure is
high and the
Alien particles accumulated
product
on the condenser
constantly
stops.
Fan defect
Fan-motor connecting bolt is
loose
Motor-mount motor assembly
is loose
Product
Fan is not balanced
vibrates
Compressor assembly bolt is
loudly.
loose
Frame assembly bolt is loose
Motor bearing is burnt
Rubber fixed condition of
motor mount is defective
Resonance
sound
Pipe vibration defect around
compressor
High
frequency
wave noise Defect in heat emitting fan in
from front control box
side of
product
Constantly
hunting for
Insufficient cold water
cold water
temperature
Evaporation Temporary rise in cold water
pressure is temperature due to abnormal
high increase in load
Potential cause Potential solution
Check for leakage and refill refrigerant
Check cold water system (Ensure rated flow)
- Is the valve of cold water system closed?
- Is the pressure difference between inlet and
outlet of cold water system appropriate?
- Is the air of cold water system cold?
Check whether outdoor temperature is within
operating range
Clean condenser
Replace fan
Check assembly condition and tighten bolt
Check assembly condition and tighten bolt
After checking fan rotation range, replace fan
If the assembly bolt/nut is loose, tighten it.
Check assembly condition and tighten bolt
Check for abnormal noise in motor (Noise in
multiple of RPM) and replace motor
Replace motor mount
Replace anti-vibration rubber attached on pipe
Clean part around heat emitting fan
Check cold water system (Ensure rated flow)
- Is the valve of cold water system closed?
- Is the pressure difference between inlet and
outlet of cold water system appropriate?
- Is the air of cold water system cold?
- Is the cooling load within appropriate range?
It is not abnormal.
But, check if it is within operating range.