Mitsubishi Electric CITY MULTI PUMY-P112VKM6 Service Manual page 4

Handle tools with care.
• If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of
compressor.
Do not use a charging cylinder.
• If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered.
Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact
with a flame, poisonous gases will be released.
Use the specified refrigerant only.
• Never use any refrigerant other than that specified.
• Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
• Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
• We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.
Follow the instructions below to prevent abrasive components contained in sandpaper and
cutting tools from entering the refrigerant circuit because those components can cause
failures of the compressor and valves.
• To deburr pipes, use a reamer or other deburring tools, not sandpaper.
• To cut pipes, use a pipe cutter, not a grinder or other tools that use abrasive materials.
• When cutting or deburring pipes, do not allow cutting chips or other foreign matters to enter the pipes.
• If cutting chips or other foreign matters enter pipes, wipe them off the inside of the pipes.
Do not pump down the system when a gas leak has been detected.
• The intake of air or other gases causes abnormally high pressure in the refrigeration cycle, which may cause explo-
sion or injury.
2-1-1. Cautions for service
• Perform service after recovering the refrigerant left in unit completely.
• Do not release refrigerant in the air.
• After completing service, charge the cycle with specified amount of refrigerant.
• If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.
2-1-2. Additional refrigerant charge
When charging directly from cylinder
• Check that cylinder for R410A on the market is a syphon type.
• Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
Electronic weighing scale
2-1-3. Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
No. Tool name
1 Gauge manifold
2 Charge hose
3 Electronic weighing scale
4 Gas leak detector
5 Adaptor for reverse flow check
OCH790 _4
Specifications
Only for R410A
Use the existing fitting specifications. (UNF1/2)
Use high-tension side pressure of 5.3MPa·G or over.
Only for R410A
Use pressure performance of 5.09MPa·G or over.
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Use the detector for R134a, R407C or R410A.
Attach on vacuum pump.
Unit