Mitsubishi Heavy Industries FDCW100VNX-A, Technical Manual

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‘19 • HM-T-340
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We recommend you to read this “SAFETY PRECAUTIONS” carefully before the installation work in order to gain full advantage
of the functions of the unit and to avoid malfunction due to mishandling.

The precautions described below are divided into and . The matters with possibilities leading to
serious consequences such as death or serious personal injury due to erroneous handling are listed in the and
the matters with possibilities leading to personal injury or damage of the unit due to erroneous handling including probability
leading to serious consequences in some cases are listed in . These are very important precautions for safety.
Be sure to observe all of them without fail.
 Be sure to con fi rm 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.
 Keep the installation manual together with owner’s manual at a place where any user can read at any time. Moreover if
necessary, ask to hand them to a new user
When install the unit, be sure to check whether the selection of installation place, power source speci fi cations, usage limitation
(piping length, height differences between indoor and outdoor units, power source voltage and etc.) and installation spaces.

Installation must be carried out by the quali fi ed installer.
If you install the system by yourself, it may cause serious trouble such as water leaks, electric shocks, fi re 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 fi re.

Use the original accessories and the speci fi ed components for installation.
If parts other than those prescribed by us are used, It may cause water leaks, electric shocks, fi re and personal injury.
 When installing in small rooms, take prevention measures not to exceed the density limit of refrigerant inthe event of
leakage.
Consult the expert about prevention measures. If the density of refrigerant exceeds the limit in the event of leakage, lack of oxygen can
occur, which can cause serious accidents.

Ventilate the working area well in the event of refrigerant leakage during installation.
If the refrigerant comes into contact with naked fl ames, poisonous gas is produced.

After completed installation, check that no refrigerant leaks from the system.
If refrigerant leaks into the room and comes into contact with an oven or other hot surface, poisonous gas is produced.

Hang up the unit at the speci fi ed points with ropes which can support the weight in lifting for portage. And to avoid jolting
out of alignment, be sure to hang up the unit at 4-point support.
An improper manner of portage such as 3-point support can cause death or serious personal injury due to falling of the unit.

Install the unit in a location with good support.
Unsuitable installation locations can cause the unit to fall and cause material damage and personal injury.

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.

Ensure that no air enters in the refrigerant circuit when the unit is installed and removed.
If air enters in the refrigerant circuit, the pressure in the refrigerant circuit becomes too high, which can cause burst and personal
injury.
 The electrical installation must be carried out by the quali fi ed electrician in accordance with “the norm for electrical work”
and “national wiring regulation”, and the system must be connected to the dedicated circuit.
Power source with insuf fi cient capacity and incorrect function done by improper work can cause electric shocks and fi re.

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 fi re.

Use the prescribed cables for electrical connection, tighten the cables securely in terminal block and relieve the cables
correctly to prevent overloading the terminal blocks.
Loose connections or cable mountings can cause anomalous heat production or fi re.
 Arrange the wiring in the control box so that it cannot be pushed up further into the box. Install the service panel
correctly.
Incorrect installation may result in overheating and fi re.

Do not perform brazing work in the airtight room.
It can cause lack of oxygen.

Use the prescribed pipes, fl are nuts and tools for R410A.
Using existing parts (for R22 or R407C) can cause the unit failure and serious accidents due to burst of the refrigerant circuit.

Tighten the fl are nut by using double spanners and torque wrench according to prescribed method. Be sure not to tighten
the fl are nut too much.
Loose fl are connection or damage on the fl are part by tightening with excess torque can cause burst or refrigerant leaks which
may result in lack of oxygen.
WARNING
SAFETY PRECAUTIONS