Before Installation; Before Installation (Relocation) - Electrical Work; Before Starting The Test Run; Selecting An Installation Site - Mitsubishi Electric CITY MULTI CMB-P104V-G1 Manuel D'installation

• Use liquid refrigerant to fill the system.
- If gas refrigerant is used to fill 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 flow check valve.
- The vacuum pump oil may flow back into the refrigerant cycle and cause the
refrigerant oil to deteriorate.
• Do not use the following tools that are used with conventional refriger-
ants.
(Gauge manifold, charge hose, gas leak detector, reverse flow 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 conven-
tional refrigerants will not react to it.
• Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deteriorate.
• Do not use antioxidant or leak-detection additive.
• Be especially careful when managing the tools.
- If dust, dirt, or water gets into the refrigerant cycle, the refrigerant may dete-
riorate.

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 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 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 or BC controller. Perform collec-
tive drainage work together with the outdoor unit, as required.

2. Selecting an installation site

2.1. About the product

• This unit uses R410A-type refrigerant.
• Piping for systems using R410A may be different from that for systems using
conventional refrigerant because the design pressure in systems using R410A
is higher. Refer to the Data Book for more information.
• Some of the tools and equipment used for installation with systems that use
other types of refrigerant cannot be used with the systems using R410A. Refer
to the Data Book for more information.
• Do not use the existing piping, as it contains chlorine, which is found in con-
ventional refrigerating machine oil and refrigerant. This chlorine will deteriorate
the refrigerant machine oil in the new equipment. The existing piping must not
be used as the design pressure in systems using R410A is higher than that in
the systems using other types of refrigerant and the existing pipes may burst.
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1.4. Before installation (relocation) - electri-
cal 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 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, or the use of substitute simple
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 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 causing 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 20 kg.
- Some products use PP bands for packaging. Do not use any PP bands as a
means of transportation. It is dangerous.
• 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.
• Do not touch the switches with wet fingers.
- Touching a switch with wet fingers can result in an 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 5 minutes before turning off the power. Otherwise, drain-
age water leakage or mechanical failure of sensitive parts may occur.

2.2. Installation site

• Install the unit in a place not exposed to rain. The BC controller is designed to
be installed indoors.
• Install the unit with adequate space around it for servicing.
• Do not install the unit in a place that would result in the piping length restric-
tions being exceeded.
• Install the unit in a place not exposed to direct radiant heat from other heat sources.
• Do not install the unit in any oily steamy place or near any machine that gener-
ates high frequencies. Doing so may cause a risk of fire, erroneous operation
or dew drop.
• Install the unit in a location where the noise from the unit will not be a problem.
(Install indoor unit and BC controller at least 5 m away from each other when
installed in a space with low background noise, e.g., hotel rooms).
• Allow enough space and access to ensure water piping, refrigerant piping and
electrical wiring can be easily connected.
• Avoid places exposed to the generation, inflow, accumulation or leakage of
flammable and sulfuric gases.
• Ensure a downward gradient of at least 1/100 for drain piping.
• Properly install the unit on a stable, load-bearing surface.