13
Check the electrical parts touch with the
metal enclosure or not, and the grounding
lead is not grounded properly
Electricity
leakage
Check it have static electricity influence
Static electricity
influence
(F)
、
Too noisy
and
vibration
There is sound
inside compressor
Check the compressor has abnormal
sound or not.
Compressor
abnormal
There is vibration
sound
Check the pipe is touched each other or
not
Pipe
touching
produce
resonance
Check the installation ground is flat and
the feet is adjusted at proper position or
not
The unit is not
placed evenly
10
、
Note of the cooling system maintenance with R134a refrigerant
：
1)The requirement of the cooling system parts
：
Because refrigerant R134a and its lubricating oil grease is of strong water
absorbability and oxidation ability, and will cause catalysis reactivity with chloride to
produce impurity to be silt. So during service process, you should pay more attentions to
the water quantity, oxide quantity, chloride quantity, oil quantity and impurity quantity
in the cooling system, and control it more strictly.
·Left water quantity control
：
a
）
If the cooling system parts, like condenser, evaporator, compressor, or the dry
filter etc., need to be replaced, the replaced parts should be stored charging with dry
nitrogen with pressure 0.2~0.3Mpa, and if these parts have leakage of nitrogen, they must
be dried in the high temperature chamber and be taken out of the water before using.
b
）
The molecular dry desiccant inside dry filter must be controlled strictly,
guaranteed that the left water quantity must be lower than 1.5WT%. And normally, after
the dry filter is opened from vacuum package, must be welded to the pipe system within
5 minutes. If at wet condition (relative humidity>50%), must take measure to be
protected from humidity, and the dry filter must be connected to the system pipe at once
after removing from package, so as to produce the sealing system.
2) The requirement of the service equipment
：
①
No need recycling equipment, except charging machine, if the equipment is special
for R134a refrigerant system, must mark it clearly to avoid use each other. (except
welding machine, pliers, electronic balance
）
②
The vacuum machine and charging machine are special used for R134a refrigerant
system.
3)
Service Procedure
：
