SUNWARD SWDM40 - Control; Travel Control

SWDM40 OPERATION & MAINTENANCE MANUAL
80
2. Common Failure and Causes of Refrigeration System
Item
Failure description
Causes
Solution
Too high
pressure of
low pressure
gauge
Frost on the pipe orifice of low
pressure
Too large opening of expansion
valve
Repair
Outlet pipe of condesor is cool
temperature package of expansion
valve and bad contact of
evaporator
Repair
Damage of expansion valve
temperature package
Change
Overfill of fluorine
Drain fluorine
Too low
pressure of
low pressure
gauge
Low pressure gauge sometimes
indicate negative pressure
Impurity in low pressure pipe or
pipe orifice is clogged
Change pipe
Inlet of expansion valve is cool
or attached by frost
Clogging of expansion valve
Flush
Too high
pressure of
high pressure
gauge
Condensor surface too hot
Condenser surface is clogged by
impurity.
Clean condenser
surface
Condensor fan not work
Stuck or bad contact of condenser
fan
Change
Compressor too hot and pipe
orifice of high pressure too hot
Air is mixed.
Adjust
Too low
pressure of
high pressure
gauge
Pressure on high and low
pressure gauge are both too low
Compressor doesn’t work
Change
Lack of fluorine
Fill fluorine
Pressure of high pressure gauge
too low, negative value of low
pressure gauge
Ice clogging or impurity clogging
check from sight glass
Change