Before Installation; Before Installation - Electrical Work; Before Starting The Test Run - Mitsubishi Electric CITY MULTI PUHY-P-YREM-A Série Manuel D'installation

Executing the piping work (mounting of ball
valve).
Air tightening and evacuating the existing pip-
ing and charging refrigerant
Enter required items in the request form of REPLACE MULTI mineral oil recovery work.
Operating mineral oil recovery
Executing test run and adjustment (for final
verification of operation).

1.4. Before installation

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 air conditioner where food, pets, plants, precision instru-
ments, or artwork are kept.
- The quality of the food, etc. may deteriorate.
• Do not use the air conditioner in special environments.
- Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of
the air conditioner or damage its parts.
• When installing the unit in a hospital, communication station, or similar
place, provide sufficient protection against noise.
- Inverter equipment, private power generator, high-frequency medical equip-
ment, or radio communication equipment may cause the air conditioner to
operate erroneously, or fail to operate. On the other hand, the air conditioner
may affect such equipment 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 indoor unit. Perform collective drainage work
together with the outdoor unit, as required.

1.5. Before installation - 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.
• The reverse phase of L lines (L
but the reverse phase of L lines and N line can not be detected.
- Some electric parts may be damaged when power is supplied during miss
wiring.
• 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 a leak circuit breaker, as required.
- If a leak circuit breaker 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 breaker and fuse of the specified capacity.
- A fuse or circuit breaker of a larger capacity, a steel or copper wire may result
in a general unit failure or fire.
• Do not wash the air conditioner units.
- Washing them may cause an electric shock.
• Be careful about 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.
I Mount the valve to the field piping (extended piping). (The ball valve is being attached to the
I Execute an airtight test to check the existing piping for deterioration or leaking.
I Calculate the quantity required by the extended piping, and charge the additional refrigerant.
Without applying any operation, keep the ball valves of the outdoor unit closed before
mineral oil recovery operation.
It is necessary to charge refrigerant in a rated quantity and adjust the quantity. Be sure to execute
when the piping length is unknown.
For detail, consult the agent of your dealer.
, L , L ) can detected (Error cord: 4103),
1 2 3
outdoor unit.)
Make sure to enter the value in the additional refrigerant charge column on the label of combined
outdoor unit being pasted on the outdoor unit.
• 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 causing damage to furniture
and other possessions.
• Be very careful about transporting the product.
- One person should not carry the product as it weighs more than 20 kg.
- Some products use PP bands for packaging. Do not use any PP bands as 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, support 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 children will not
play with them. If children play with a plastic bag which was not torn apart,
they face the risk of suffocation.

1.6. Before starting the test run

Caution:
• Turn on the power at least 12 hours before starting operation.
- Starting operation immediately after turning on the main power switch can
result in irreversible damage to internal parts. Keep the power switch turned
on during the operational season.
• Do not touch the switches with wet fingers.
- Touching a switch with wet fingers can cause electric shock.
• Do not touch the refrigerant pipes during and immediately after opera-
tion.
- During and immediately after operation, the refrigerant pipes may be hot or
cold, depending on the condition of the refrigerant flowing through the refrig-
erant piping, compressor, and other refrigerant cycle parts. Your hands may
suffer burns or frostbite if you touch the refrigerant pipes.
• Do not operate the air conditioner with the panels and guards removed.
- Rotating, hot, or high-voltage parts can cause injuries.
• Do not turn off the power immediately after stopping operation.
- Always wait at least five minutes before turning off the power. Otherwise,
water leakage and trouble may occur.
• Do not touch the surface of the compressor during servicing.
- If unit is connected to the supply and not running, crank case heater at com-
pressor base is operating.
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