Mitsubishi Heavy Industries SRC20MA-S Technical Manual Download

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5 Installation

○ Use this system only for household and

residence.

○ This appliance must be installed according to the national wiring regulation.

○ A 2-level switch must be used for the fixed wiring of the power supply and its disconnection

clearance must be at least 3mm.

○ If the outdoor unit may tip over or move and drop from the original installation location, use

trip bolts or string to secure it in place.

○ The liquid pipe and gas pipe in the piping should be insulated with thermal insulation.

SAFETY PRECAUTIONS

• Please read this “SAFETY PRECAUTIONS” carefully before the installation work in order to ensure correct installation.
• The precautions described below are divided into

WARNING

and

CAUTION

. The matters with possibilities leading to

serious consequences such as death or serious personal injury due to erroneous handling are listed in the

WARNING

, however

the matters listed in

CAUTION

may sometimes lead to serious accidents. These are very important precautions for safety. Be

sure to observe all of them without fail.

• For qualified installing personnel, take precautions in respect to themselves by using suitable protective clothing, groves, etc., and then

perform the installation works.

• Please pay attention not to fall down the tools, etc. when installing the unit at the high position.
• If unusual noise can be heard during operation, consult the local dealer.
• Be sure to confirm no anomaly on the equipment by commissioning after completed installation and explain the operating methods as

well as the maintenance methods of this equipment to the user according to the owner’s manual.

• Symbols which appear frequently in the text have the following meaning:

Strictly prohibited

Observe instructions

Provide proper earthing

• Keep the installation manual together with owner’s manual properly. Moreover if necessary, ask to hand them to a new user.

WARNING

• Installation must be carried out by the qualified

installer and only the specified optional components
should be used.

If you install the system by yourself, it may cause serious
trouble such as water leaks, electric shocks, fire and
personal injury, as a result of a system malfunction.

• Install the system in full accordance with the

instruction manual.

Incorrect installation may cause bursts, personal injury,
water leaks, electric shocks and fire.

• Be sure to use only for household and residence.

If this appliance is installed in inferior environment such
as machine shop etc., it can cause malfunction.

• Use the original accessories and the specified

components for installation.

If parts other than those prescribed by us are used, it may
cause drop of machine, water leaks, electric shocks, fire,
refrigerant leakage, insufficient performance, poor control,
and personal injury.

• Install the unit in a location with good support and

ensure the unit is stable when installed, so that it can
withstand earthquakes and strong winds.

Unsuitable installation locations can cause the unit to fall
and cause material damage and personal injury.

• Ventilate the working area well in the event of

refrigerant leakage during installation.

If the refrigerant comes into contact with naked flames,
poisonous gas is produced.

• When the equipment is to be installed in a small room,

take preventive measures to avoid refrigerant leakage
exceeding the density limit.

Consult with the installation professionals about the
preventive measures. If the density is greater than the limit
of refrigerant, it may cause serious accidents such as
refrigerant leakage, shortage of oxygen, etc.

• Confirm there is no refrigerant leakage after the

installation.

If the refrigerant leaked comes into contact with the fire of
an air blowing type heater, oven, etc., poisonous gas is
produced.

• Use the prescribed pipes, flare nuts and tools for

R410A.

Using conventional parts (for R22) can cause the unit
failure and serious accidents due to burst of the refrigerant
circuit.

• Tighten the flare nut by torque wrench with specified

method.

If the flare nuts were tightened with excess torque, this
may cause burst and refrigerant leakage after a long
period.

• Do not open the operation valves for liquid line and

gas line until completed refrigerant piping work, air
tightness test and evacuation.

If  the  compressor  is  operated  when  operation  valves  are
open  before  the  connection  of  refrigerant  piping  work  is
completed,  it  can  cause  frostbite  or  injury  due  to  rapid
refrigerant  leakage,  and  burst  or  personal  injury  due  to
anomalously  high  pressure  in  the  refrigerant  circuit  into
which air is sucked.

• The electrical installation must be carried out by the

qualified electrician in accordance with “the norm for
electrical work” and “national wiring regulation”, and
the system must be connected to the dedicated circuit.

Power supply with insufficient capacity and incorrect
function done by improper work can cause electric shocks
and fire.

• Be sure to shut off the power before starting electrical

work.

Failure to shut off the power can cause electric shocks,
unit failure or incorrect function of equipment.

• Be sure to use the cables conformed to safety standard

and cable ampacity for power distribution work.

Unconformable cables can cause electric leak, anomalous
heat production or fire.

• This appliance must be connected to main power

supply by means of a circuit breaker or switch
(fuse:16A) with a contact separation of at least 3mm.

• If the appliance has a plug, the plug must comply with

IEC 60884-1.

• Use the prescribed cables for electrical connection,