Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 103

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(4) 4 way ceiling cassette type (FDTC)

INSTALLATION MANUAL FOR CEILING CASSETTE

Models FDTC25VF, 35VF, 50VF, 60VF

– 4 WAY COMPACT (600 x 600mm) –

This manual is for the installation of an indoor unit.

For electrical wiring work (Indoor), refer to the electrical wiring work installation manual. For remote

For remote control installation, refer to page 301. For wireless kit installation, refer to page 314. For

For electrical wiring work (Indoor), refer to the electrical wiring work installation manual. For remote

controller installation, refer to the installation manual attached to a remote controller. For wireless

electrical wiring work (Outdoor) and refrigerant pipe work installation for outdoor unit, refer to page

controller installation, refer to the installation manual attached to a remote controller. For wireless

kit installation, refer to the installation manual attached to a wireless kit. For electrical wiring work

14.

kit installation, refer to the installation manual attached to a wireless kit. For electrical wiring work

(Outdoor) and refrigerant pipe work installation for outdoor unit, refer to the installation manual

This unit must always be used with the panel.

(Outdoor) and refrigerant pipe work installation for outdoor unit, refer to the installation manual

attached to an outdoor unit.

This unit must always be used with the panel.

SAFETY PRECAUTIONS

● Read the "SAFETY PRECAUTIONS" carefully ﬁrst of all and then strictly follow it during the installation work

in order to protect yourself.

l Read the "SAFETY PRECAUTIONS" carefully ﬁrst of all and then strictly follow it during the installation

● The precautionary items mentioned below are distinguished into two levels,

work in order to protect yourself.

: Wrong installation would cause serious consequences such as injuries or death.

l The precautionary items mentioned below are distinguished into two levels,

: Wrong installation might cause serious consequences depending on circumstances.

CAUTION

: Wrong installation would cause serious consequences such as injuries or death.

Both mentions the important items to protect your health and safety so strictly follow them by any means.

: Wrong installation might cause serious consequences depending on circumstances.

●The meanings of "Marks" used here are as shown as follows:

Both mentions the important items to protect your health and safety so strictly follow them by any means.

Never do it under any circumstances.

Always do it according to the instruction.

Never do it under any circumstances.

Always do it according to the instruction.

l After completing the installation, do commissioning to conﬁrm there are no abnormalities, and explain to the

●After completing the installation, do commissioning to conﬁrm there are no abnormalities, and explain to the

customers about "SAFETY PRECAUTIONS", correct operation method and maintenance method (air ﬁlter

cleaning, operation method and temperature setting method) with user's manual of this unit.

Ask your customers to keep this installation manual together with the user's manual. Also, ask them to hand

over the user's manual to the new user when the owner is changed.

WARNING

l Installation should be performed by the specialist.

●Installation should be performed by the specialist.

If you install the unit by yourself, it may lead to serious trouble such as water leakage, electric shock, ﬁre, and

If you install the unit by yourself, it may lead to serious trouble such as water leakage, electric shock, ﬁre, and injury due to overturn of the unit.

injury due to overturn of the unit.

●Install the system correctly according to these installation manuals.

l Install the system correctly according to these installation manuals.

Improper installation may cause explosion, injury, water leakage, electric shock, and ﬁre.

l Consider measurement not to exceed the limit of the density of refrigerant in the event of

●When installing in small rooms, take prevention measures not to exceed the density limit of refrigerant in the

leakage especially when it is installed in a small room.

event of leakage, referred by the formula (accordance with ISO5149).

Consult the specialist about the measure. If the density of refrigerant exceeds the limit in the event of the leakage,

If the density of refrigerant exceeds the limit, please consult the dealer and install the ventilation system, otherwise lack of

serious accidents may occur due to lack of oxygen.

oxygen can occur, which can cause serious accidents.

l Use the genuine accessories and the speciﬁed parts for installation.

●Use the genuine accessories and the speciﬁed parts for installation.

If parts unspeciﬁed by our company are used it could cause water leakage, electric shock, ﬁre, and injury due to

overturn of the unit.

If parts unspeciﬁed by our company are used it could cause water leakage, electric shock, ﬁre, and injury due to overturn of the unit.

l Ventilate the working area well in case the refrigerant leaks during installation.

●Ventilate the working area well in case the refrigerant leaks during installation.

If the refrigerant contacts the ﬁre, toxic gas is produced.

l Install the unit in a location that can hold heavy weight.

●Install the unit in a location that can hold heavy weight.

Improper installation may cause the unit to fall leading to accidents.

l Install the unit properly in order to be able to withstand strong winds such as typhoons, and

●Install the unit properly in order to be able to withstand strong winds such as typhoons, and earthquakes.

earthquakes.

Improper installation may cause the unit to fall leading to accidents.

l Do not mix air in to the cooling cycle on installation or removal of the air conditioner.

●Do not mix air in to the cooling cycle on installation or removal of the air conditioner.

●Do not mix air in to the cooling cycle on installation or removal of the air-conditioner.

If air is mixed in, the pressure in the cooling cycle will rise abnormally and may cause explosion and injuries.

l Be sure to have the electrical wiring work done by qualiﬁed electrical installer, and use

●Be sure to have the electrical wiring work done by qualiﬁed electrical installer, and use exclusive circuit.

exclusive circuit.

Power source with insufﬁcient capacity and improper work can cause electric shock and ﬁre.

●Use speciﬁed wire for electrical wiring, fasten the wiring to the terminal securely, and hold the cable securely in

l Use speciﬁed wire for electrical wiring, fasten the wiring to the terminal securely, and hold the

order not to apply unexpected stress on the terminal.

cable securely in order not to apply unexpected stress on the terminal.

Loose connections or hold could result in abnormal heat generation or ﬁre.

l Arrange the electrical wires in the control box properly to prevent them from rising. Fit the lid

●Arrange the electrical wires in the control box properly to prevent them from rising. Fit the lid of the services

of the services panel property.

panel property.

Improper ﬁtting may cause abnormal heat and ﬁre.

l Check for refrigerant gas leakage after installation is completed.

●Check for refrigerant gas leakage after installation is completed.

If the refrigerant gas leaks into the house and comes in contact with a fan heater, a stove, or an oven, toxic gas

If the refrigerant gas leaks into the house and comes in contact with a fan heater, a stove, or an oven, toxic gas is produced.

is produced.

●Use the speciﬁed pipe, ﬂare nut, and tools for R410A.

l Use the speciﬁed pipe, ﬂare nut, and tools for R410A.

Using existing parts (R22) could cause the unit failure and serious accident due to explosion of the cooling cycle.

l Tighten the ﬂare nut according to the speciﬁed method by with torque wrench.

●Tighten the ﬂare nut according to the speciﬁed method by with torque wrench.

If the ﬂare nut were tightened with excess torque, it could cause burst and refrigerant leakage after a long period.

l Make sure there is no dust or clogging on both the plug and the socket nor loose connection

●Do not put the drainage pipe directly into drainage channels where poisonous gases such as sulﬁde gas can occur.

of the socket before plugging, and plug in securely to the end of the blade.

Poisonous gases will ﬂow into the room through drainage pipe and seriously affect the user's health and safety. This can also

Accumulation of dust, clogging on the socket or plug, or loose installation of the socket could cause electric shock

cause the corrosion of the indoor unit and a resultant unit failure or refrigerant leak.

and ﬁre. Replace the socket if it is loose.

●Connect the pipes for refrigeration circuit securely in installation work before compressor is operated.

l Connect the pipes for refrigeration circuit securely in installation work before compressor is

operated.

If the compressor is operated when the service valve is open without connecting the pipe, it could cause explosion and injuries due

to abnormal high pressure in the system.

If the compressor is operated when the service valve is open without connecting the pipe, it could cause

to abnormal high pressure in the system.

explosion and injuries due to abnormal high pressure in the system.

●Stop the compressor before removing the pipe after shutting the service valve on pump down work.

l Stop the compressor before removing the pipe on pump down work.

If the pipe is removed when the compressor is in operation with the service valve open, air would be mixed in the refrigeration circuit

If the pipe is removed when the compressor is in operation with the service valve open, air would be mixed in the

and it could cause explosion and injuries due to abnormal high pressure in the cooling cycle.

refrigeration circuit and it could cause explosion and injuries due to abnormal high pressure in the cooling cycle.

●Only use prescribed optional parts. The installation must be carried out by the qualiﬁed installer.

●Only use prescribed option parts. The installation must be carried out by the qualiﬁed installer.

l Use the genuine optional parts. And installation should be performed by a specialist.

If you install the system by yourself, it can cause serious trouble such as water leaks, electric shocks, ﬁre.

If you install the unit by yourself, it could cause water leakage, electric shock and ﬁre.

●Do not repair by yourself. And consult with the dealer about repair.

l Do not repair by yourself. And consult with the dealer about repair.

●Do not repair by yourself. And consult with the dealer about repair.

Improper repair may cause water leakage, electric shock or ﬁre.

l Consult the dealer or a specialist about removal of the air conditioner.

●Consult the dealer or a specialist about removal of the air conditioner.

●Consult the dealer or a specialist about removal of the air-conditioner.

Improper installation may cause water leakage, electric shock or ﬁre.

l Turn off the power source during servicing or inspection work.

●Turn off the power source during servicing or inspection work.

If the power is supplied during servicing or inspection work, it could cause electric shock and injury by the

If the power is supplied during servicing or inspection work, it could cause electric shock and injury by the operating fan.

operating fan.

l Do not run the unit when the panel or protection guard are taken off.

●Do not run the unit when the panel or protection guard are taken off.

Touching the rotating equipment, hot surface, or high voltage section could cause an injury to be caught in the

Touching the rotating equipment, hot surface, or high voltage section could cause an injury to be caught in the machine, to get

machine, to get burned, or electric shock.

burned, or electric shock.

l Shut off the power before electrical wiring work.

●Shut off the power before electrical wiring work.

It could cause electric shock, unit failure and improper running.

● Perform earth wiring surely.

Do not connect the earth wiring to the gas pipe, water pipe, lightning rod and telephone earth wiring. Improper earth could

cause unit failure and electric shock due to a short circuit.

l Perform earth wiring surely.

cause unit failure and electric shock due to a short circuit.

● Earth leakage breaker must be installed.

Do not connect the earth wiring to the gas pipe, water pipe, lightning rod and telephone earth wiring. Improper

earth could cause unit failure and electric shock due to a short circuit.

If the earth leakage breaker is not installed, it can cause electric shocks.

l Use the circuit breaker of correct capacity.

● Use the circuit breaker of correct capacity. Circuit breaker should be the one that disconnect all

Using the incorrect capacity one could cause the system failure and ﬁre.

poles under over current.

l Do not use any materials other than a fuse of correct capacity where a fuse should be used.

Using the incorrect one could cause the system failure and ﬁre.

Connecting the circuit by wire or copper wire could cause unit failure and ﬁre.

● Do not use any materials other than a fuse of correct capacity where a fuse should be used.

l Do not install the indoor unit near the location where there is possibility of ﬂammable gas

and

Connecting the circuit by wire or copper wire could cause unit failure and ﬁre.

and

CAUTION

Connecting the circuit by wire or copper wire could cause unit failure and ﬁre.

CAUTION

leakages.

● Do not install the indoor unit near the location where there is possibility of ﬂammable gas leakages.

and

If the gas leaks and gathers around the unit, it could cause ﬁre.

l Do not install and use the unit where corrosive gas (such as sulfurous acid gas etc.) or

● Do not install and use the unit where corrosive gas (such as sulfurous acid gas etc.) or ﬂammable gas (such

ﬂammable gas (such as thinner, petroleum etc.) may be generated or accumulated, or volatile

as thinner, petroleum etc.) may be generated or accumulated, or volatile ﬂammable substances are handled.

ﬂammable substances are handled.

It could cause the corrosion of heat exchanger, breakage of plastic parts etc. And inﬂammable gas could cause ﬁre.

● Secure a space for installation, inspection and maintenance speciﬁed in the manual.

l Do not use the indoor unit at the place where water splashes such as laundry.

Insufﬁcient space can result in accident such as personal injury due to falling from the installation place.

Indoor unit is not waterproof. It could cause electric shock and ﬁre.

● Do not use the indoor unit at the place where water splashes such as laundry.

l Do not use the indoor unit for a special purpose such as food storage, cooling for precision

Indoor unit is not waterproof. It could cause electric shock and ﬁre.

instrument, preservation of animals, plants, and a work of art.

● Do not use the indoor unit for a special purpose such as food storage, cooling for precision

It could cause the damage of the items.

instrument, preservation of animals, plants, and a work of art.

l Do not install nor use the system near equipments which generate electromagnetic wave or

It could cause the damage of the items.

high harmonics.

● Do not install nor use the system near equipments which generate electromagnetic wave or high harmonics.

Equipments like inverter equipment, private power generator, high-frequency medical equipment, or

telecommunication equipment might inﬂuence the air conditioner and cause a malfunction and breakdown. Or the

Equipments like inverter equipment, private power generator, high-frequency medical equipment, or telecommunication

air conditioner might inﬂuence medical equipments or telecommunication equipments, and obstruct their medical

equipment might inﬂuence the air conditioner and cause a malfunction and breakdown. Or the air conditioner might

equipment might inﬂuence the air-conditioner and cause a malfunction and breakdown. Or the air-conditioner might

activity or cause jamming.

inﬂuence medical equipments or telecommunication equipments, and obstruct their medical activity or cause jamming.

l Do not install the remote controller at the direct sunlight.

● Do not install the remote controller at the direct sunlight.

● Do not install the remote control at the direct sunlight.

It could cause breakdown or deformation of the remote controller.

It could cause breakdown or deformation of the remote control.

l Do not install the indoor unit at the place listed below.

● Do not install the indoor unit at the place listed below.

ž Places where ﬂammable gas could leak.

· Places where ﬂammable gas could leak.

ž Places where carbon ﬁber, metal powder or any powder is ﬂoated.

· Places where carbon ﬁber, metal powder or any powder is ﬂoated.

ž Place where the substances which affect the air conditioner are generated such as sulﬁde gas, chloride gas,

· Place where the substances which affect the air conditioner are generated

· Place where the substances which affect the air-conditioner are generated

acid or alkali.

such as sulﬁde gas, chloride gas, acid, alkali or ammonic atmospheres.

ž Places exposed to oil mist or steam directly.

· Places exposed to oil mist or steam directly.

ž On vehicles and ships

· On vehicles and ships

ž Places where machinery which generates high harmonics is used.

· Places where machinery which generates high harmonics is used.

ž Places where cosmetics or special sprays are frequently used.

● Do not install the indoor unit in the locations listed below (Be sure to install the indoor unit

ž Highly salted area such as beach.

according to the installation manual for each model because each indoor unit has each limitation)

ž Heavy snow area

· Locations with any obstacles which can prevent inlet and outlet air of the unit

ž Places where the system is affected by smoke from a chimney.

· Locations where vibration can be ampliﬁed due to insufﬁcient strength of structure.

ž Altitude over 1000m

· Locations where the infrared receiver is exposed to the direct sunlight or the strong light beam. (in case of the

l Do not put any valuables which will break down by getting wet under the air conditioner.

infrared speciﬁcation unit)

· Locations where an equipment affected by high harmonics is placed. (TV set or radio receiver is placed within 5m)

Condensation could drop when the relative humidity is higher than 80% or drain pipe is clogged, and it damages

· Locations where an equipment affected by high harmonics is placed. (TV set or radio receiver is placed within 5m)

· Locations where drainage cannot run off safely.

user's belongings.

· Locations where drainage cannot run off safely.

It can affect performance or function and etc..

l Do not use the base frame for the outdoor unit which is corroded or damaged after a long

● Do not put any valuables which will break down by getting wet under the air conditioner.

● Do not put any valuables which will break down by getting wet under the air-conditioner.

period of use.

Condensation could drop when the relative humidity is higher than 80% or drain pipe is clogged, and it damages user's belongings.

It could cause the unit falling down and injury.

Condensation could drop when the relative humidity is higher than 80% or drain pipe is clogged, and it damages user's belongings.

● Do not use the base frame for the outdoor unit which is corroded or damaged after a long period of use.

l Pay attention not to damage the drain pan by weld sputter when brazing work is done near the

● Do not use the base frame for the outdoor unit which is corroded or damaged after a long period of use.

unit.

It could cause the unit falling down and injury.

● Pay attention not to damage the drain pan by weld sputter when brazing work is done near the unit.

If sputter entered into the unit during brazing work, it could cause damage (pinhole) of drain pan and leakage of

● Pay attention not to damage the drain pan by weld sputter when brazing work is done near the unit.

water. To avoid damaging, keep the indoor unit packed or cover the indoor unit.

If sputter entered into the unit during brazing work, it could cause damage (pinhole) of drain pan and leakage of water.

l Install the drain pipe to drain the water surely according to the installation manual.

To avoid damaging, keep the indoor unit packed or cover the indoor unit.

Improper connection of the drain pipe may cause dropping water into room and damaging user's belongings.

● Install the drain pipe to drain the water surely according to the installation manual.

l Do not put the drain pipe directly into the ditch where toxic gas such as sulﬁde gas is

Improper connection of the drain pipe may cause dropping water into room and damaging user's belongings.

generated.

● Do not share the drain pipe for indoor unit and GHP (Gas Heat Pump system) outdoor unit.

Toxic gas would ﬂow into the room and it would cause serious damage to user's health and safety.

Toxic exhaust gas would ﬂow into room and it might cause serious damage (some poisoning or deﬁciency of oxygen) to

l Do not share the drain pipe for indoor unit and GHP (Gas Heat Pump system) outdoor unit.

user's health and safety.

Toxic exhaust gas would ﬂow into room and it might cause serious damage (some poisoning or deﬁciency of

● Be sure to perform air tightness test by pressurizing with nitrogen gas after completed refrigerant piping work.

oxygen) to user's health and safety.

If the density of refrigerant exceeds the limit in the event of refrigerant leakage in the small room, lack of oxygen can

l For drain pipe installation, be sure to make descending slope of greater than 1/100, not to

occur, which can cause serious accidents.

make traps, and not to make air-bleeding

● For drain pipe installation, be sure to make descending slope of greater than 1/100, not to make traps,

Check if the drainage is correctly done during commissioning and ensure the space for inspection and

and not to make air-bleeding.

maintenance.

Check if the drainage is correctly done during commissioning and ensure the space for inspection and maintenance.

l Ensure the insulation on the pipes for refrigeration circuit so as not to condense water.

● Ensure the insulation on the pipes for refrigeration circuit so as not to condense water.

Incomplete insulation could cause condensation and it would wet ceiling, ﬂoor, and any other valuables.

l Do not install the outdoor unit where is likely to be a nest for insects and small animals.

● Do not install the outdoor unit where is likely to be a nest for insects and small animals.

Insects and small animals could come into the electronic components and cause breakdown and ﬁre. Instruct the

Insects and small animals could come into the electronic components and cause breakdown and ﬁre. Instruct the user to

user to keep the surroundings clean.

keep the surroundings clean.

l Pay extra attention, carrying the unit by hand.

● Pay extra attention, carrying the unit by hand.

Carry the unit with 2 people if it is heavier than 20kg. Do not use the plastic straps but the grabbing place, moving

Carry the unit with 2 people if it is heavier than 20kg. Do not use the plastic straps but the grabbing place, moving the unit

the unit by hand. Use protective gloves in order to avoid injury by the aluminum ﬁn.

by hand. Use protective gloves in order to avoid injury by the aluminum ﬁn.

l Make sure to dispose of the packaging material.

● Make sure to dispose of the packaging material.

Leaving the materials may cause injury as metals like nail and woods are used in the package.

l Do not operate the system without the air ﬁlter.

● Do not operate the system without the air ﬁlter.

It may cause the breakdown of the system due to clogging of the heat exchanger.

l Do not touch any button with wet hands.

● Do not touch any button with wet hands.

It could cause electric shock.

l Do not touch the refrigerant piping with bare hands when in operation.

● Do not touch the refrigerant piping with bare hands when in operation.

The pipe during operation would become very hot or cold according to the operating condition, and it could cause

a burn or frostbite.

The pipe during operation would become very hot or cold according to the operating condition, and it could cause a burn or frostbite.

l Do not clean up the air conditioner with water.

●

Do not clean up the air conditioner with water.

●

Do not clean up the air-conditioner with water.

It could cause electric shock.

l Do not turn off the power source immediately after stopping the operation.

●

Do not turn off the power source immediately after stopping the operation.

●

Do not turn off the power source immediately after stopping the operation.

Be sure to wait for more than 5 minutes. Otherwise it could cause water leakage or breakdown.

l Do not control the operation with the circuit breaker.

●

Do not control the operation with the circuit breaker.

●

Do not control the operation with the circuit breaker.

It could cause ﬁre or water leakage. In addition, the fan may start operation unexpectedly and it may cause injury.

102

'17 • SCM-T-225

PJA012D786

PJA012D786B

PJA012D781

CAUTION

· Places where cosmetics or special sprays are

frequently used.

· Highly salted area such as beach.

· Heavy snow area

· Places where the system is affected by

smoke from a chimney.

· Altitude over 1000m

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