Mitsubishi Electric JG79A476H01 Installation Manual

SPLIT-TYPE AIR CONDITIONERS

INSTALLATION MANUAL

1. BEFORE INSTALLATION

1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
• Be sure to read "THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY" before installing the air conditioner.
• Be sure to observe the warnings and cautions specified here as they include important items related to safety.
• After reading this manual, be sure to keep it together with the OPERATING INSTRUCTIONS for future reference.
Do not install the unit by yourself (user).
Incomplete installation could cause fire, electric shock, injury
due to the unit falling, or leakage of water. Consult the dealer
from whom you purchased the unit or a qualified installer.
Perform the installation securely referring to the installa-
tion manual.
Incomplete installation could cause fire, electric shock, injury
due to the unit falling, or leakage of water.
When installing the unit, use appropriate protective equip-
ment and tools for safety.
Failure to do so could cause injury.
Install the unit securely in a place which can bear the
weight of the unit.
If the installation location cannot bear the weight of the unit,
the unit could fall causing injury.
Electrical work should be performed by a qualified, expe-
rienced electrician, according to the installation manual.
Be sure to use an exclusive circuit. Do not connect other
electrical appliances to the circuit.
If the capacity of the power circuit is insufficient or there is
incomplete electrical work, it could result in a fire or an electric
shock.
Earth the unit correctly.
Do not connect the earth to a gas pipe, water pipe, lightning
rod, or telephone earth. Defective earthing could cause electric
shock.
Do not damage the wires by applying excessive pressure
with parts or screws.
Damaged wires could cause fire or electric shock.
Be sure to cut off the main power in case of setting up the
indoor P.C. board or wiring works.
Failure to do so could cause electric shock.
Use the specified wires to connect the indoor and outdoor
units securely and attach the wires firmly to the terminal
block connecting sections so the stress of the wires is
not applied to the sections. Do not extend the wires, or
use intermediate connection.
Install an earth leakage breaker depending on the instal-
lation place.
If an earth leakage breaker is not installed, it could cause
electric shock.
Perform the drainage/piping work securely according to
the installation manual.

1-2. SELECTING THE INSTALLATION LOCATION

INDOOR UNIT
• Where airflow is not blocked.
• Where cool air spreads over the entire room.
• Rigid wall without vibration.
• Where it is not exposed to direct sunshine. Do not expose to
direct sunshine also during the period following unpacking to
before use.
• Where easily drained.
• At a distance 1 m or more away from your TV and radio. Opera-
tion of the air conditioner may interfere with radio or TV recep-
tion. An amplifier may be required for the affected device.
• In a place as far away as possible from fluorescent and incan-
descent lights (so the infrared remote control can operate the
air conditioner normally).
• Where the air filter can be removed and replaced easily.
REMOTE CONTROLLER
• Where it is easy to operate and easily visible.
• Where children cannot touch it.
• Select a position about 1.2 m above the floor and check that
signals from the remote controller are surely received by the
indoor unit from that position ('beep' or 'beep beep' receiving
tone sounds). After that, attach remote controller holder to a
pillar or wall and install wireless remote controller.

1-3. SPECIFICATIONS

Model
Indoor unit Outdoor unit
MS-GF20VA MU-GF20VA
MS-GF25VA MU-GF25VA
MS-GF35VA MU-GF35VA
*1 Connect to the power switch which has a gap of 3 mm or more
when open to interrupt the source power phase. (When the
power switch is shut off, it must interrupt all phases.)
*2 Use wires in conformity with design 60245 IEC 57.
*3 Never use pipes with thickness less than specified. The pres-
sure resistance will be insufficient.
*4 Use a copper pipe or a copper-alloy seamless pipe.
Model names are indicated in 1-3.
Incomplete connecting and securing could cause fire.
Do not install the unit in a place where inflammable gas
may leak.
If gas leaks and accumulates in the area around the unit, it
could cause an explosion.
Do not use intermediate connection of the power cord or
the extension cord and do not connect many devices to
one AC outlet.
It could cause a fire or an electric shock due to defective con-
tact, defective insulation, exceeding the permissible current,
etc.
Be sure to use the parts provided or specified parts for
the installation work.
The use of defective parts could cause an injury or leakage
of water due to a fire, an electric shock, the unit falling, etc.
When plugging the power supply plug into the outlet,
make sure that there is no dust, clogging, or loose parts
in both the outlet and the plug. Make sure that the power
supply plug is pushed completely into the outlet.
If there is dust, clogging, or loose parts on the power supply
plug or the outlet, it could cause electric shock or fire. If loose
parts are found on the power supply plug, replace it.
Attach the electrical cover to the indoor unit and the
service panel to the outdoor unit securely.
If the electrical cover of the indoor unit and/or the service panel
of the outdoor unit are not attached securely, it could result in
a fire or an electric shock due to dust, water, etc.
When installing, relocating, or servicing the unit, make
sure that no substance other than the specified refrigerant
(R410A) enters the refrigerant circuit.
Any presence of foreign substance such as air can cause
abnormal pressure rise and may result in explosion or injury.
The use of any refrigerant other than that specified for the
system will cause mechanical failure, system malfunction, or
unit breakdown. In the worst case, this could lead to a serious
impediment to securing product safety.
If there is defect in the drainage/piping work, water could drop
from the unit, soaking and damaging household goods.
Do not touch the air inlet or the aluminum fins of the
outdoor unit.
This could cause injury.
Note:
In rooms where inverter type fluorescent lamps are used, the signal
from the wireless remote controller may not be received.
OUTDOOR UNIT
• Where it is not exposed to strong wind.
• Where airflow is good and dustless.
• Where rain or direct sunlight can be avoided as much as pos-
sible.
• Where neighbours are not annoyed by operation sound or hot
air.
• Where rigid wall or support is available to prevent the increase
of operation sound or vibration.
• Where there is no risk of combustible gas leakage.
• When installing the unit at a high level, be sure to secure the
unit legs.
• Where it is at least 3 m away from the antenna of TV set or
radio. Operation of the air conditioner may interfere with radio
or TV reception in areas where reception is weak. An amplifier
may be required for the affected device.
• Install the unit horizontally.
• Please install it in an area not affected by snowfall or blowing
snow. In areas with heavy snow, please install a canopy, a
pedestal and/or some baffle boards.
Power supply *1
Breaker
Rated Voltage Frequency
capacity
230 V 50 Hz 10 A
*5 Be careful not to crush or bend the pipe during pipe bending.
*6 Refrigerant pipe bending radius must be 100 mm or more.
*7 If pipe length exceeds 7.5 m, additional refrigerant (R410A)
charge is required. (No additional charge is required for pipe
length less than 7.5 m.)
Additional refrigerant = A × (pipe length (m) – 7.5)
JG79A476H01
Phillips screwdriver
Level
Scale
Utility knife or scissors
65 mm hole saw
Torque wrench
Wrench (or spanner)
WARNING
(Could lead to death, serious injury, etc.)
CAUTION
(Could lead to serious injury in particular environments when operated incorrectly.)
Wire specifications *2
(thickness *3, *4)
Indoor/outdoor
Power supply Gas / Liquid
connecting wire
3-core 4-core ø9.52 / 6.35 mm
2 2
2.5 mm 1.0 mm
Required Tools for Installation
4 mm hexagonal wrench
Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
Do not discharge the refrigerant into the atmosphere. If
refrigerant leaks during installation, ventilate the room.
If refrigerant comes in contact with a fire, harmful gas could
be generated. Refrigerant leakage may cause suffocation.
Provide ventilation in accordance with EN378-1.
Check that the refrigerant gas does not leak after instal-
lation has been completed.
If refrigerant gas leaks indoors, and comes into contact with
the flame of a fan heater, space heater, stove, etc., harmful
substances will be generated.
Use appropriate tools and piping materials for installa-
tion.
The pressure of R410A is 1.6 times more than R22. Not using
appropriate tools or materials and incomplete installation could
cause the pipes to burst or injury.
When pumping down the refrigerant, stop the compressor
before disconnecting the refrigerant pipes.
If the refrigerant pipes are disconnected while the compressor
is running and the stop valve is open, air could be drawn in
and the pressure in the refrigeration cycle could become ab-
normally high. This could cause the pipes to burst or injury.
When installing the unit, securely connect the refrigerant
pipes before starting the compressor.
If the compressor is started before the refrigerant pipes are
connected and when the stop valve is open, air could be
drawn in and the pressure in the refrigeration cycle could
become abnormally high. This could cause the pipes to burst
or injury.
Fasten a flare nut with a torque wrench as specified in
this manual.
If fastened too tight, a flare nut may break after a long period
and cause refrigerant leakage.
The unit shall be installed in accordance with national
wiring regulations.
Do not install the outdoor unit where small animals may
live.
If small animals enter and touch the electric parts inside the
unit, it could cause a malfunction, smoke emission, or fire.
Also, advise user to keep the area around the unit clean.
Note:
It is advisable to make a piping loop near outdoor unit so as to
reduce vibration transmitted from there.
Note:
When operating the air conditioner in low outside temperature,
be sure to follow the instructions described below.
• Never install the outdoor unit in a place where its air inlet/
outlet side may be exposed directly to wind.
• To prevent exposure to wind, install the outdoor unit with its
air inlet side facing the wall.
• To prevent exposure to wind, it is recommended to install a
baffle board on the air outlet side of the outdoor unit.
Avoid the following places for installation where air conditioner
trouble is liable to occur.
• Where flammable gas could leak.
• Where there is much machine oil.
• Where oil is splashed or where the area is filled with oily
smoke (such as cooking areas and factories, in which the
properties of plastic could be changed and damaged).
• Salty places such as the seaside.
• Where sulfide gas is generated such as a hot spring.
• Where there is high-frequency or wireless equipment.
• Where there is emission of high levels of VOCs, including
phthalate compounds, formaldehyde, etc., which may cause
chemical cracking.
Pipe size
Pipe length and height difference
Max. pipe length
Max. height difference
Max. number of bends *5, *6
(0.8 mm)
Refrigerant adjustment A *7
Insulation thickness *8, *9
*8 Insulation material : Heat resisting foam plastic 0.045 specific
gravity
*9 Be sure to use the insulation of specified thickness. Excessive
thickness may cause incorrect installation of the indoor unit and
insufficient thickness may cause dew drippage.
(GF20, 25/GF35)
20/25 m
10 m
10
20 g/m
8 mm