Mitsubishi Electric Fresh Master GUF-50RDH4 Installation Instructions Manual page 5

- Never repair the unit or transfer it to another site by yourself.
If repair is performed improperly, water leakage, electric
shock or fire may result. If you need to have the unit repaired
or moved, consult your dealer.
1) Outdoor unit
Warning:
- The outdoor unit must be installed on a stable, level surface,
in a place where there is no accumulation of snow, leaves or
rubbish.
- Do not stand on, or place any items on the unit. You may fall
down or the item may fall, causing injury.
Caution:
- The outdoor unit should be installed in a location where air
and noise emitted by the unit will not disturb the neighbours.
2) Fresh Master
Warning:
- The Fresh Master should be securely installed. If the unit is
loosely mounted, it may fall, causing injury.
- Install the unit on a rigid structure to prevent excessive op-
eration sound or vibration.
3) Remote controller
Warning:
- The Remote controller should be installed in such a way that
children cannot play with it.
4) Drain hose
Caution:
- Make sure that the drain hose is installed so that drainage
can go ahead smoothly. Incorrect installation may result in
water leakage, causing damage to furniture.
5) Refrigerant pipe
Warning:
- Be sure to wrap insulation around the piping. Direct contact
with the bare piping may result in burns or frostbite.
6) Power Supply, fuse or circuit isolator
Warning:
- Make sure that the unit is powered by a dedicated power sup-
ply. Other appliances connected to the same power supply
could cause an overload.
- Make sure that there is a mains power switch.
- Be sure to adhere to the unit's voltage and fuse circuit isola-
tor ratings. Never use a cable or a fuse with a higher rating
than the one specified.
7) Grounding
Caution:
- The unit must be properly grounded. Never connect the
grounding wire to a gas pipe, water pipe, lightning conduc-
tor or tele phone grounding wire. If the unit is not grounded
properly, electric shock may result.
- Check frequently that the ground wire from the outdoor unit
is properly connected to both the unit's ground terminal and
the grounding electrode.
1.2. Precautions for devices that use
R407C refrigerant
Caution:
- Do not use the existing refrigerant piping.
- The old refrigerant and refrigerator oil in the existing piping con-
tains a large amount of chlorine which may cause the refrigera-
tor oil of the new unit to deteriorate.
- Use refrigerant piping made of C1220 (CU-DHP) phosphorus
deoxidized copper as specified in the JIS H3300 "Copper and
copper alloy seamless pipes and tubes". In addition, be sure
that the inner and outer surfaces of the pipes are clean and
free of hazardous sulphur, oxides, dust/dirt, shaving par-
ticles, oils, moisture, or any other contaminant.
- Contaminants on the inside of the refrigerant piping may cause
the refrigerant residual oil to deteriorate.
- Store the piping to be used during installation indoors and
keep both ends of the piping sealed until just before brazing.
(Store elbows and other joints in a plastic bag.)
- If dust, dirt, or water enters the refrigerant cycle, deterioration of
the oil and compressor trouble may result.
- Use ester oil, ether oil or alkylbenzene (small amount) same
as the refrigerator oil to coat flares and flange connections.
- The refrigerator oil will degrade if it is mixed with a large
amount of mineral oil.
- Use liquid refrigerant to fill the system.
- If gas refrigerant is used to seal the system, the composition of
the refrigerant in the cylinder will change and performance may
drop.
- Do not use a refrigerant other than R407C.
- If another refrigerant (R22, etc.) is used, the chlorine in the
refrigerant may cause the refrigerator oil to deteriorate.
- Use a vacuum pump with a reverse flow check valve.
- The vacuum pump oil may flow back into the refrigerant cycle
and cause the refrigerator oil to deteriorate.
- Do not use the following tools that are used with convention-
al refrigerants.
(Gauge manifold, charge hose, gas leak detector, reverse flow
check valve, refrigerant charge base, vacuum gauge, refriger-
ant recovery equipment)
- If the conventional refrigerant and refrigerator oil are mixed in
the R407C, the refrigerant may deteriorate.
- If water is mixed in the R407C, the refrigerator oil may deterio-
rate.
- Since R407C does not contain any chlorine, gas leak detectors
for conventional refrigerants will not react to it.
- Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deterio-
rate.
- Be especially careful when managing the tools.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerant
may deteriorate.
- Refrigerant leakage may cause suffocation. Provide ventila-
tion in accordance with EN378-1.
1.3. Precautions for devices that use
R410A refrigerant
- Make sure to use new refrigerant piping.
- When using the existing piping which used R22, take care of
the following points.
- Replace the flare nut with that is attached to the product. Flare
section must be finished with the flare processing. (See P.10.)
- Use of piping with thin wall should be avoided. (See P.10.)
- Use refrigerant piping made of C1220 (CU-DHP) phosphorus
deoxidized copper as specified in the JIS H3300 "Copper
and copper alloy seamless pipes and tubes". The pipes must
have the wall thickness as shown in the table below. In ad-
dition, be sure that the inner and outer surfaces of the pipes
are clean and free of hazardous sulphur, oxides, dust/dirt,
shaving particles, oils, moisture, or any other contaminant.
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