Mitsubishi Electric MFZ-KJ12NA Notice D'installation page 2

CONTENTS
1. BEFORE INSTALLATION ......................1
2. INDOOR UNIT INSTALLATION .............4
3. OUTDOOR UNIT INSTALLATION ..........8
4. FLARE CONNECTION, PIPE
CONNECTION .......................................9
1. BEFORE INSTALLATION
1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
• Be sure to read these safety precautions and instructions.
• Be sure to observe the warnings and cautions specified here.
• After reading this manual, be sure to store it with the OPERATING INSTRUCTIONS for future reference.
• Please report to your supply authority or obtain their consent before connecting this equipment to the power supply system.
n Do not install the unit by yourself (user).
Improper or incomplete installation could cause fire, electric shock, injury
due to the unit falling, or water leakage. Consult a qualified installer or the
dealer from whom you purchased the unit.
n Follow the instructions detailed in the installation manual.
Incomplete installation could cause fire or electric shock, injury due to the
unit falling, or leakage of water.
n When installing the unit, use appropriate protective equipment and tools
for safety.
Failure to do so could cause injury.
n Install the unit securely in a place that can bear the weight of the unit.
If the installation location cannot bear the weight of the unit, the unit could
fall causing injury.
n Perform electrical work according to the installation manual and 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 electri-
cal work, it could result in a fire or an electric shock.
n Ground the unit correctly.
Do not connect the ground wire to a gas pipe, water pipe, lightning rod or
telephone ground. Defective grounding could cause electric shock.
If required, take measures against leakage current.
n Do not damage the wires.
Damaged wires could cause fire.
n Be sure to shut off the main power when setting up the indoor P.C. board
or wiring.
Failure to do so could cause electric shock.
n Use the specified wires to securely connect the indoor and outdoor units.
Attach the wires firmly to avoid applying stress to the terminal block.
Improper connection could cause fire.
n Do not install the unit in a place where flammable gas may leak.
If gas leaks and accumulates around the unit, it could cause an explosion.
n Do not use intermediate connection of the power cord or the extension
cord. Do not connect many devices to one AC outlet.
It could cause a fire or an electric shock.
n 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.
n When plugging the power supply plug into the outlet, make sure that there
is no dust, blockage, or loose parts both in the outlet and on the plug.
Verify that the power supply plug is completely in the outlet.
If there is dust, blockage, 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.
n Securely attach the electrical cover to the indoor unit and the service
panel to the outdoor unit.
If the electrical cover of the indoor unit and/or the service panel of the outdoor
unit are not attached securely, dust, water, etc. could collect in the unit and could
cause a fire or an electric shock.
n Perform the drainage/piping work securely according to the installation
manual.
If there is defect in the drainage/piping work, water could drip from the unit,
and damage household items.
n Do not touch the air inlet or the aluminum fins of the outdoor unit.
This could cause injury.
EN-1
5. PURGING PROCEDURES, LEAK TEST,
AND TEST RUN .....................................10
6. PUMPING DOWN ................................10
When installing multi units, refer to the
installation manual of the multi unit for
outdoor unit installation.
WARNING
n When installing, relocating, or servicing the unit, make sure that no sub-
stance 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 mal-
function, or unit breakdown. In the worst case, this could lead to a serious
impediment to securing product safety.
n Do not alter the unit.
It may cause fire, electric shock, injury or water leakage.
n Do not discharge the refrigerant into the atmosphere. Check that the
refrigerant gas does not leak after installation has been completed. If
refrigerant leaks during installation, ventilate the room.
If refrigerant comes in contact with a fire, harmful gas could be generated.
If refrigerant gas leaks indoors, and comes into contact with the flame of a
fan heater, space heater, stove, etc., harmful gases will be generated.
n Use appropriate tools and piping materials for installation.
The pressure of R410A is 1.6 times higher than R22. Not using the appropri-
ate tools and materials, or improper installation could cause the pipes to
burst causing an injury.
n When the refrigeration circuit has a leak, do not execute pump down with
the compressor.
n When pumping down the refrigerant, stop the compressor before discon-
necting 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 abnormally high, causing the pipes to burst.
n 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
the stop valve is open, air could be drawn in and the pressure in the refrig-
eration cycle could become abnormally high, causing the pipes to burst.
n Fasten a flare nut with a torque wrench as specified in this manual.
If fastened too tight, a flare nut could break and cause refrigerant leakage.
n Install the unit according to national wiring regulations.
n Exercise caution when using any auxiliary heat source and follow all
third party manufacturer instructions and safety guidelines for installa-
tion and usage.
Any auxiliary heat source connected to this unit via the CN24 connection
must have an independent temperature control mechanism. Failure to install
and maintain such temperature control mechanism may void the warranty
for this unit.
Mitsubishi Electric shall not bear any warranty obligation or other liability for
any damage or loss in connection with such third party auxiliary heaters.
CAUTION
n Do not install the outdoor unit where small animals may live.
If small animals enter the unit and damage its electrical parts, it could cause
a malfunction, smoke emission, or fire. Keep the area around the unit clean.
Required Tools for Installation
Tube benders
Phillips screwdriver
Level
Scale
Utility knife or scissors
3 in. (75 mm) hole saw
Torque wrench
Wrench (or spanner)
(Could lead to death or serious injury.)
(Could lead to serious injury when operated incorrectly.)
5/32 in. (4 mm) hexagonal
wrench
Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer