Mitsubishi Electric Fresh Master GUF-50RDH4 Installation Instructions Manual page 6

ø6.35, Wall thickness 0.8 mm
ø12.7, Wall thickness 0.8 mm
It is strictly prohibited to use pipes with thin wall not listed in
the above table.
If the inside of pipe is contaminated, it could cause deterioration
of refrigerator oil, or other problems.
- 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.
- Do not use a refrigerant other than R410A.
- If another refrigerant (R22, etc.) is used, the chlorine in the refrig-
erant 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.
- For the following tools, use only the tools special to the
refrigerant R410A.
- Tools as listed in the following table are required for the refrig-
erant R410A.
Tool name (For R410A)
Gauge manifold Flare tool
Charging hose Protrusion adjust copper pipe gauge
Gas leak detector Vacuum pump adaptor
Torque wrench Balance for refrigerant charging
- Be especially careful when managing the tools.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerant
may deteriorate.
- Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deterio-
rate.
- Refrigerant leakage may cause suffocation. Provide ventila-
tion in accordance with EN378-1.
1.4. Before conducting supply pipe
and drain pipe work
[Supply pipe work is not required for GUF-50, 100RD4]
Caution:
- The water quality of the permeable film humidifier's supply
water should meet public waterworks standards, and have a
hardness less than 100 mg/ . If the supply water does not
meet these standards, use a deionizer.
- The supply pressure must be within the range of 2×10
49×10 pa.
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- Supply pressure that is lower than the specified range will cause
the water to not supplied the permeable-film humiditier, and the hu-
midifier may not work. Supply pressure that exceeds the specified
range may cause damage to the solenoid valve and result in water
leaks.
- Drain pipe gradient must be more than 1/100.
- Drain water will not be properly discharged.
- For areas that are extremely cold in winter, perform freeze-
prevention on the supply pipe by wrapping a freeze preven-
tion heater and thermal insulation.
- Cold temperatures may freeze water, and damage supply pipe.
- Install the drain piping according to this installation Manual
to ensure proper drainage. Wrap thermal insulation around
the pipes to prevent condensation.
- Improper drain piping may cause water leakage and damage to
furniture and other possessions.
ø9.52, Wall thickness 0.8 mm
ø15.88, Wall thickness 1.0 mm
pa to
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1.5. Before getting installed
Caution:
- Do not install the unit where combustible gas may leak.
- If the gas leaks and accumulates around the unit, an explosion
may result.
- Do not use the Fresh Master where food, pets, plants, preci-
sion instruments, or artwork are kept.
- The quality of the food, etc. may deteriorate.
- Do not use the Fresh Master in special environments.
- Oil, steam, sulfuric smoke, etc. can significantly reduce the
performance of the Fresh Master or damage its parts.
- When installing the unit in a hospital, communication station,
or similar place, provide sufficient protection against noise.
- The inverter equipment, private power generator, high-frequency
medical equipment, or radio communication equipment may
cause the Fresh Master to operate erroneously, or fail to oper-
ate. On the other hand, the Fresh Master may affect such equip-
ment by creating noise that disturbs medical treatment or image
broadcasting.
- Do not install the unit on a structure that may cause leakage.
- When the room humidity exceeds 80% or when the drain pipe
is clogged, condensation may drip from the Fresh Master.
Perform collective drainage work together with the outdoor unit,
as required.
1.6. Before getting installed (moved) -
electrical work
Caution:
- Ground the unit.
- Do not connect the ground wire to gas or water pipes, lightning
rods, or telephone ground lines. Improper grounding may result
in electric shock.
- Install the power cable so that tension is not applied to the cable.
- Tension may cause the cable to break and generate heat and
cause a fire.
- Install an leak circuit isolator, as required.
- If an leak circuit isolator is not installed, electric shock may
result.
- Use power line cables of sufficient current carrying capacity
and rating.
- Cables that are too small may leak, generate heat, and cause a
fire.
- Use only a circuit isolator and fuse of the specified capacity.
- A fuse or circuit isolator of a larger capacity or a steel or copper
wire may result in a general unit failure or fire.
- Do not wash the Fresh Master.
- Washing them may cause an electric shock.
- Be careful that the installation base is not damaged by long
use.
- If the damage is left uncorrected, the unit may fall and cause
personal injury or property damage.
- Be very careful about product transportation.
- Only one person should not carry the product if it weighs more
than 20 kg.
- Fresh Master use PP bands for packaging. Do not use any PP
bands for a means of transportation. It is dangerous.
- Do not touch the heat exchanger fins. Doing so may cut your
fingers.
- When transporting the outdoor unit, suspend it at the specified
positions on the unit base. Also support the outdoor unit at four
points so that it cannot slip sideways.
- Safely dispose of the packing materials.
- Packing materials, such as nails and other metal or wooden
parts, may cause stabs or other injuries.
- Tear apart and throw away plastic packaging bags so that chil-
dren can not play with them. If children play with a plastic bag
which was not torn apart, they face the risk of suffocation.
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