Mitsubishi Electric PURY-P350YJM-A [12/39] Precautions for devices that use r410a refrigerant

1.4. Before installation (relocation) -

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.

Never connect in reverse phases.

Never connect the Power Line L1, L2, and L3 to Terminal N.

- If the unit is miss wired, when power is supplied, some electrical parts will

be damaged.

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 ﬁ re.

Install a leak circuit breaker, as required.

- If a leak circuit breaker is not installed, electric shock may result.

Use power line cables of sufﬁ cient current carrying capacity and rating.

- Cables that are too small may leak, generate heat, and cause a ﬁ re.

Use only a circuit breaker and fuse of the speciﬁ ed capacity.

- A fuse or circuit breaker of a larger capacity, or the use of a substitute

simple steel or copper wire may result in a general unit failure or ﬁ re.

Do not wash the air conditioner units.

- 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.

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.

Be very careful about transporting the product.

- One person should not carry the product. Its weight is in excess of 20kg.

- 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 ﬁ ns. Doing so may cut your ﬁ ngers.

- When transporting the outdoor unit, support it at the speciﬁ ed 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 has not been torn

apart, they face the risk of suffocation.

1.5. 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. Make sure of the phase order of

power supply and voltage between each phase.

Do not touch the switches with wet ﬁ ngers.

- Touching a switch with wet ﬁ ngers can result in an electric shock.

Do not touch the refrigerant pipes during and immediately after

operation.

- During and immediately after operation, the refrigerant pipes may be hot

or cold, depending on the condition of the refrigerant ﬂ owing through the

refrigerant 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 5 minutes before turning off the power. Otherwise,

drainage water leakage or mechanical failure of sensitive parts may occur.

Do not touch the surface of the compressor during servicing.

- If unit is connected to a supply and not running, the crank case heater

located at the base of the compressor may still be operating.

•

1.2. Precautions for devices that use

R410A refrigerant

Caution:

Do not use existing refrigerant piping.

- The old refrigerant and refrigerant oil in the existing piping contains a large

amount of chlorine which may cause the refrigerant oil of the new unit to

deteriorate.

- R410A is a high-pressure refrigerant and can cause the existing piping to

burst.

Use refrigerant piping made of phosphorus deoxidized 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 particles, oils, moisture, or any other

contaminant.

- Contaminants on the inside of the refrigerant piping may cause the

refrigerant 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 failure may result.

Apply a small amount of ester oil, ether oil, or alkyl benzene to ﬂ ares.

(for indoor unit)

- Inﬁ ltration of a large amount of mineral oil may cause the refrigerant oil to

deteriorate.

Use liquid refrigerant to ﬁ ll the system.

- If gas refrigerant is used to ﬁ ll the system, the composition of the

refrigerant in the cylinder will change and performance may drop.

Do not use a refrigerant other than R410A.

- If another refrigerant (R22, etc.) is mixed with R410A, the chlorine in the

refrigerant may cause the refrigerant oil to deteriorate.

Use a vacuum pump with a reverse ﬂ ow check valve.

- The vacuum pump oil may ﬂ ow back into the refrigerant cycle and cause

the refrigerant oil to deteriorate.

Do not use the following tools that are used with conventional

refrigerants.

(Gauge manifold, charge hose, gas leak detector, reverse ﬂ ow check

valve, refrigerant charge base, refrigerant recovery equipment)

- If the conventional refrigerant and refrigerant oil are mixed in the R410A,

the refrigerant may deteriorate.

- If water is mixed in the R410A, the refrigerant oil may deteriorate.

- Since R410A 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 deteriorate.

Be especially careful when managing the tools.

- If dust, dirt, or water gets into the refrigerant cycle, the refrigerant may

deteriorate.

1.3. 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

instruments, 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 signiﬁ cantly reduce the performance of

the air conditioner or damage its parts.

When installing the unit in a hospital, communication station, or similar

place, provide sufﬁ cient protection against noise.

- Inverter equipment, private power generator, high-frequency medical

equipment, 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 or over things that are subject to water

damage.

- 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.

•

WT05963X01_GB.indd 12WT05963X01_GB.indd 12 2010/08/26 20:39:432010/08/26 20:39:43

Mitsubishi Electric PURY-P350YJM-A [12/39] Precautions for devices that use r410a refrigerant

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