Service Tools - Mitsubishi Electric PUZ-WM50VHA Service Manual

b) Isolate system electrically.
c) Before attempting the procedure, ensure that:
• mechanical handling equipment is available, if required, for handling refrigerant cylinders;
• all personal protective equipment is available and being used correctly;
• the recovery process is supervised at all times by a competent person;
• recovery equipment and cylinders conform to the appropriate standards.
d) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.
e) Make sure that cylinder is situated on the scales before recovery takes place.
f) Start the recovery machine and operate in accordance with manufacturer's instructions.
g) Do not overfill cylinders. (No more than 80 % volume liquid charge).
h) Do not exceed the maximum working pressure of the cylinder, even temporarily.
i) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equip-
ment are removed from site promptly and all isolation valves on the equipment are closed off.
j) Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked.
(10) Labelling
Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant. The label shall be
dated and signed. For appliances containing flammable refrigerants, ensure that there are labels on the equipment stat-
ing the equipment contains flammable refrigerant.
(11) Recovery
When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that
all refrigerants are removed safely. When transferring refrigerant into cylinders, ensure that only appropriate refrigerant
recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge are
available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i.e. spe-
cial cylinders for the recovery of refrigerant). Cylinders shall be complete with pressure-relief valve and associated shut-
off valves in good working order. Empty recovery cylinders are evacuated and, if possible, cooled before recovery
occurs.
The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at
hand and shall be suitable for the recovery of all appropriate refrigerants including, when applicable, flammable refriger-
ants. In addition, a set of calibrated weighing scales shall be available and in good working order. Hoses shall be com-
plete with leak-free disconnect couplings and in good condition. Before using the recovery machine, check that it is in
satisfactory working order, has been properly maintained and that any associated electrical components are sealed to
prevent ignition in the event of a refrigerant release. Consult manufacturer if in doubt.
The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant
waste transfer note arranged. Do not mix refrigerants in recovery units and especially not in cylinders. If compressors or
compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that
flammable refrigerant does not remain within the lubricant. The evacuation process shall be carried out prior to returning
the compressor to the suppliers. Only electric heating to the compressor body shall be employed to accelerate this pro-
cess. When oil is drained from a system, it shall be carried out safely.
(12) Parts inspection
Parts
Pressure relief valve (3 bar)
Temperature and pressure
relief valve

[5] Service tools

Use the below service tools as exclusive tools for R32 refrigerant.
No. Tool name
Gauge manifold
1
Charge hose
2
Electronic weighing scale
3
Gas leak detector
4
Adaptor for reverse flow check
5
Refrigerant charge base
6
Refrigerant cylinder
7
Refrigerant recovery equipment
8
OCH727
Check every Possible failures
1 year PRV would be fixed and
(turning the knob expansion vessel would
manually) burst
· Only for R32
· Use the existing fitting specifications . (UNF1/2)
· Use high-tension side pressure of 5.3MPa·G or over.
· Only for R32
· Use pressure performance of 5.09MPa·G or over.
· Use the detector for R134a, R407C, R410a or R32.
· Attach on vacuum pump.
· Only for R32
· Cylinder with syphon
Specifications
7
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