Premium PFR40W - Note of the Cooling System Maintenance with R134 A Refrigerant

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and
vibration
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
Note of the cooling system maintenance with R134a refrigerant：
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：
1）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.
2） 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.
The requirement of the service equipment：
①No 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）
②The vacuum machine and charging machine are special used for R134a refrigerant
system.
Service Procedure：
Special requirement during service process：
(a). Duration of from opening of compressor to vacuuming process must be less than 10
minutes, and for other parts not more than 12 minutes.
(b)． Vacuuming duration should not loess than 20 minutes.
(c)． If refrigerant leakage happens, it need to replace the compressor. Before welding,
dry the cooling system by the nitrogen air.
(d)． If the dust blockage happens in cooling system pipe, if can be blow out by the
nitrogen, don’t need to replace the compressor, otherwise the cabinet is no useful