Inhaltsverzeichnis; Before Installation And Electric Work; Safety Precautions; Symbols Used In The Illustrations - Mitsubishi Electric City Multi PQHY-P-YHM-A series Installationshandbuch

Contents
1. Safety precautions ..................................................................................... 14
1.1. Before installation and electric work .......................................... 14
1.2. Precautions for devices that use R410A refrigerant .................. 15
1.3. Before installation ...................................................................... 15
1.4. Before installation (relocation) - electrical work ......................... 15
1.5. Before starting the test run ........................................................ 15
2. About the product ....................................................................................... 16
3. Combination of heat source units .............................................................. 16
4. Specifications ............................................................................................. 17
5. Confirmation of parts attached ................................................................... 18
6. Lifting method ............................................................................................ 18
7. Installation of unit ....................................................................................... 18
7.1. Installation ................................................................................. 18
7.2. Service space ............................................................................ 18
8. Water pipe installation ................................................................................ 19
8.1. Precautions during installation .................................................. 19
8.2. Insulation installation ................................................................. 19
8.3. Water processing and water quality control .............................. 19
8.4. Pump interlock .......................................................................... 20

1. Safety precautions

1.1. Before installation and electric work

u Before installing the unit, make sure you read all the
"Safety precautions".
u The "Safety precautions" provide very important points
regarding safety. Make sure you follow them.
Symbols used in the text
Warning:
Describes precautions that should be observed to prevent danger of injury
or death to the user.
Caution:
Describes precautions that should be observed to prevent damage to the
unit.

Symbols used in the illustrations

: Indicates an action that must be avoided.
: Indicates that important instructions must be followed.
: Indicates a part which must be grounded.
: Beware of electric shock. (This symbol is displayed on the main unit
label.) <Color: yellow>
Warning:
Carefully read the labels affixed to the main unit.
HIGH VOLTAGE WARNING:
• Control box houses high-voltage parts.
• When opening or closing the front panel of the control box, do not let it
come into contact with any of the internal components.
• Before inspecting the inside of the control box, turn off the power,
keep the unit off for at least 10 minutes, and confirm that the voltage
between FT-P and FT-N on INV Board has dropped to DC20V or less.
(It takes about 10 minutes to discharge electricity after the power
supply is turned off.)
Warning:
• Do not use refrigerant other than the type indicated in the manuals
provided with the unit and on the nameplate.
- Doing so may cause the unit or pipes to burst, or result in explosion or fire
during use, during repair, or at the time of disposal of the unit.
- It may also be in violation of applicable laws.
- MITSUBISHI ELECTRIC CORPORATION cannot be held responsible
for malfunctions or accidents resulting from the use of the wrong type of
refrigerant.
• The water circuit should be a closed circuit.
• Ask the dealer or an authorized technician to install the air conditioner.
- Improper installation by the user may result in water leakage, electric
shock, or fire.
• Install the unit at a place that can withstand its weight.
- Failure to do so may cause the unit to fall down, resulting in injuries and
damage to the unit.
• Use the specified cables for wiring. Make the connections securely so
that the outside force of the cable is not applied to the terminals.
- Inadequate connection and fastening may generate heat and cause a fire.
14
9. Refrigerant piping installation ..................................................................... 20
9.1. Caution ...................................................................................... 20
9.2. Refrigerant piping system ........................................................ 21
10. Additional refrigerant charge ...................................................................... 22
10.1. Calculation of additional refrigerant charge ............................... 22
10.2. Precautions concerning piping connection and valve
operation ................................................................................... 23
10.3. Airtight test, evacuation, and refrigerant charging ..................... 24
10.4. Thermal insulation of refrigerant piping ..................................... 25
10.5. Installing the water stopper ....................................................... 25
11. Wiring (For details, refer to the installation manual of each unit and
controller.) .................................................................................................. 25
11.1. Caution ...................................................................................... 25
11.2. Control box and connecting position of wiring ........................... 25
11.3. Wiring transmission cables ....................................................... 26
11.4. Wiring of main power supply and equipment capacity .............. 28
12. Test run ...................................................................................................... 29
12.1. The following phenomena do not represent faults. ................... 29
13. Information on rating plate ......................................................................... 29
• Prepare for strong winds and earthquakes and install the unit at the
specified place.
- Improper installation may cause the unit to topple and result in injury and
damage to the unit.
• Always use filters and other accessories specified by Mitsubishi Electric.
- Ask an authorized technician to install the accessories. Improper
installation by the user may result in water leakage, electric shock, or fire.
• Never repair the unit. If the air conditioner must be repaired, consult
the dealer.
- If the unit is repaired improperly, water leakage, electric shock, or fire may
result.
• Do not touch the fan and heat exchanger fins.
• If refrigerant gas leaks during installation work, ventilate the room.
- If the refrigerant gas comes into contact with a flame, poisonous gases will
be released.
• Install the air conditioner according to this Installation Manual.
- If the unit is installed improperly, water leakage, electric shock, or fire may
result.
• Have all electric work done by a licensed electrician according
to "Electric Facility Engineering Standard" and "Interior Wire
Regulations" and the instructions given in this manual and always use
a dedicated power supply.
- If the power source capacity is inadequate or electric work is performed
improperly, electric shock and fire may result.
• Keep the electric parts away from water (washing water etc.).
- It might result in electric shock, catching fire or smoke.
• Securely install the heat source unit terminal cover (panel).
- If the terminal cover (panel) is not installed properly, dust or water may
enter the heat source unit and fire or electric shock may result.
• When installing and moving the air conditioner to another site, do not
charge it with a refrigerant different from the refrigerant specified on
the unit.
- If a different refrigerant or air is mixed with the original refrigerant, the
refrigerant cycle may malfunction and the unit may be damaged.
• If the air conditioner is installed in a small room, measures must be
taken to prevent the refrigerant concentration from exceeding the
safety limit if the refrigerant should leak.
- Consult the dealer regarding the appropriate measures to prevent the
safety limit from being exceeded. Should the refrigerant leak and cause
the safety limit to be exceeded, hazards due to lack of oxygen in the room
could result.
• When moving and reinstalling the air conditioner, consult the dealer or
an authorized technician.
- If the air conditioner is installed improperly, water leakage, electric shock,
or fire may result.
• After completing installation work, make sure that refrigerant gas is not
leaking.
- If the refrigerant gas leaks and is exposed to a fan heater, stove, oven, or
other heat source, it may generate noxious gases.
• Do not reconstruct or change the settings of the protection devices.
- If the pressure switch, thermal switch, or other protection device is shorted
or operated forcibly, or parts other than those specified by Mitsubishi
Electric are used, fire or explosion may result.
• To dispose of this product, consult your dealer.
• The installer and system specialist shall secure safety against leakage
according to local regulation or standards.
- Choose the appropriate wire size and the switch capacities for the main
power supply described in this manual if local regulations are not available.
• Pay special attention to the place of installation, such as a basement,
etc. where refrigeration gas can accumulate, since refrigerant is
heavier than the air.