Safety Precautions; Before Starting The Test Run; Using R410A Refrigerant Air Conditioners - Mitsubishi Electric PUMY-P36NHMU3 Manuel D'installation

1. Safety precautions

1.3. Before electric work
Caution:
• Be sure to install circuit breakers. If not installed, electric shock may result.
• Please follow applicable federal, state, or local codes to prevent potential
leakage/electric shock. Or install a ground fault interrupt for the prevention
of leakage and electric shock.
• For the power lines, use standard cables of sufficient capacity. Otherwise, a
short circuit, overheating, or fire may result.
• When installing the power lines, do not apply tension to the cables. If the
connections are loosened, the cables can snap or break and overheating or
fire may result.

1.4. Before starting the test run

Caution:
• Turn on the main power switch more than 12 hours before starting operation.
Starting operation just after turning on the power switch can severely damage
the internal parts. Keep the main power switch turned on during the operation
season.
• Before starting operation, check that all panels, guards and other protective
parts are correctly installed. Rotating, hot, or high voltage parts can cause
injuries.

1.5. Using R410A refrigerant air conditioners

Caution:
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. Make sure the insides of the pipes are clean
and do not contain any harmful contaminants such as sulfuric compounds,
oxidants, debris, or dust. Use pipes with the specified thickness. (Refer to
page 5) Note the following if reusing existing pipes that carried R22 refrigerant.
- Replace the existing flare nuts and flare the flared sections again.
- Do not use thin pipes. (Refer to page 5)
• Store the pipes to be used during installation indoors and keep both ends of
the pipes sealed until just before brazing. (Leave elbow joints, etc. in their
packaging.) If dust, debris, or moisture enters the refrigerant lines, oil dete-
rioration or compressor breakdown may result.
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration
oil applied to the flared sections. If mineral oil is mixed in the refrigeration
oil, oil deterioration may result.
• Do not use refrigerant other than R410A refrigerant. If another refrigerant is
used, the chlorine will cause the oil to deteriorate.
1.6. Precautions for salt damage–resistant model
("-BS" model)
Although this product (only "-BS" model) has been designed to be resistant to salt
damage, observe the following precautions to maintain the performance of the unit.
1. Avoid installing the unit in a location where it will be exposed directly to seawater
or sea breeze.
2. If the cover panel may become covered with salt, be sure to install the unit in a
location where the salt will be washed away by rainwater. (If a sunshade is installed,
it may be difficult for rainwater to clean the panel.)
3. To ensure that water does not collect in the base of the outdoor unit, make sure
that the base is level, not at angle. Water collecting in the base of the outdoor unit
could cause rust.
• Be sure to ground the unit. Do not connect the ground wire to gas or water
pipes, lightning rods, or telephone grounding lines. If the unit is not prop-
erly grounded, electric shock may result.
• Use circuit breakers (ground fault interrupter, isolating switch (+B fuse),
and molded case circuit breaker) with the specified capacity. If the circuit
breaker capacity is larger than the specified capacity, breakdown or fire
may result.
• Do not touch any switch with wet hands. Electric shock may result.
• Do not touch the refrigerant pipes with bare hands during operation. The
refrigerant pipes are hot or cold depending on the condition of the flowing
refrigerant. If you touch the pipes, burns or frostbite may result.
• After stopping operation, be sure to wait at least 5 minutes before turning off
the main power switch. Otherwise, water leakage or breakdown may result.
• Use the following tools specifically designed for use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant. Contact your
nearest dealer for any questions.
Tools (for R410A)
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
• Be sure to use the correct tools. If dust, debris, or moisture enters the refriger-
ant lines, refrigeration oil deterioration may result.
• Do not use a charging cylinder. If a charging cylinder is used, the composition
of the refrigerant will change and the efficiency will be lowered.
4. If the unit is installed in a coastal area, clean the unit with water regularly to remove
any salt build-up.
5. If the unit is damaged during installation or maintenance, be sure to repair it.
6. Be sure to check the condition of the unit regularly.
7. Be sure to install the unit in a location with good drainage.
Flare tool
Size adjustment gauge
Vacuum pump adapter
Electronic refrigerant charging scale
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