Mitsubishi Electric CITY MULTI PEFY-P100VMAE, Technical & Service Manual

ii

HWE0812B

GB

Precautions for handling units for use with R410A

WARNING

Keep electrical parts away from water.

Wet electrical parts pose a risk of electric shock, smoke, or 
fire.

Securely attach the control box cover.

If the cover is not installed properly, dust or water may infil-
trate and pose a risk of electric shock, smoke, or fire.

Only use the type of refrigerant that is indicated on the unit 
when installing or relocating the unit.

Infiltration of any other types of refrigerant or air into the unit 
may adversely affect the refrigerant cycle and may cause 
the pipes to burst or explode.

When installing the unit in a small space, take appropriate 
precautions to prevent leaked refrigerant from reaching the 
limiting concentration.

Leaked refrigerant gas will displace oxygen and may cause 
oxygen starvation. Consult your dealer before installing the 
unit.

Consult your dealer or a qualified technician when moving 
or reinstalling the unit.

Improper installation may result in water leakage, electric 
shock, or fire.

After completing the service work, check for a refrigerant 
leak.

If leaked refrigerant is exposed to a heat source, such as a 
fan heater, stove, or electric grill, toxic gases will be gener-
ated.

Do not try to defeat the safety features of the unit.

Forced operation of the pressure switch or the temperature 
switch by defeating the safety features for these devices, or 
the use of accessories other than the ones that are recom-
mended by Mitsubishi Electric may result in smoke, fire, or 
explosion.

Consult your dealer for proper disposal method.

Do not use a leak detection additive.

CAUTION

Do not use the existing refrigerant piping.

A large amount of chlorine that may be contained in the re-
sidual refrigerant and refrigerator oil in the existing piping 
may cause the refrigerator oil in the new unit to deteriorate.

Use refrigerant piping materials made of phosphorus deox-
idized copper. Keep the inner and outer surfaces of the 
pipes clean and free of such contaminants as sulfur, oxides, 
dust, dirt, shaving particles, oil, and moisture.

Contaminants in the refrigerant piping may cause the refrig-
erator oil to deteriorate.

Store the piping materials indoors, and keep both ends of 
the pipes sealed until immediately before brazing. (Keep el-
bows and other joints wrapped in plastic.)

Infiltration of dust, dirt, or water into the refrigerant system 
may cause the refrigerator oil to deteriorate or cause the 
compressor to malfunction.

Use a small amount of ester oil, ether oil, or alkyl benzene 
to coat flares and flanges.

Infiltration of a large amount of mineral oil may cause the re-
frigerator oil to deteriorate.

Charge the system with refrigerant in the liquid phase.

If gaseous refrigerant is drawn out of the cylinder first, the 
composition of the remaining refrigerant in the cylinder will 
change and become unsuitable for use.

Only use R410A.

The use of other types of refrigerant that contain chloride 
may cause the refrigerator oil to deteriorate.

Use a vacuum pump with a check valve.

If a vacuum pump that is not equipped with a check valve is 
used, the vacuum pump oil may flow into the refrigerant cy-
cle and cause the refrigerator oil to deteriorate.

Prepare tools for exclusive use with R 410A. Do not use the 
following tools if they have been used with the conventional 
refrigerant: gauge manifold, charging hose, gas leak detec-
tor, check valve, refrigerant charge base, vacuum gauge, 
and refrigerant recovery equipment.

If the refrigerant or the refrigerator oil that may be left on these 
tools are mixed in with R410A, it may cause the refrigerator oil 
in the new system to deteriorate. 
Infiltration of water may cause the refrigerator oil to deteriorate.
Leak detectors for conventional refrigerants will not detect an 
R410A leak because R410A is free of chlorine.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of the refrigerant 
in the cylinder will change and become unsuitable for use.

Exercise special care when handling tools for use with R410A.

Infiltration of dust, dirt, or water into the refrigerant system 
may cause the refrigerator oil to deteriorate.

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