MITSUBISHI ELECTRIC PUMY-P·VKM Series Outdoor Air Conditioners Instruction Manual

• The 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 pins of C510 on the outdoor multi-controller circuit board has dropped to DC20V or less. (It takes about 10 minutes to discharge electricity after the power supply is turned off.)

Warning:

• 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 only specified cables for wiring. The wiring connections must be made securely with no tension applied on the terminal connections. Also, never splice the power cable or the indoor-outdoor unit connection cables for wiring (unless otherwise indicated in this document).
  Failure to observe these instructions may result in overheating, a fire or communication failure.

• 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 heat exchanger fins.
  – Improper handling may result in injury.

• 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 & website.
  – 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.

• Securely install the outdoor unit terminal cover (panel).
  – If the terminal cover (panel) is not installed properly, dust or water may enter the outdoor 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 another 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 regulations 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 the refrigerant is heavier than the air.

• For outdoor units that allow fresh air intake to the indoor unit, the installation site must be carefully chosen to ensure only clean air can enter the room.
  – Direct exposure to outdoor air may have harmful effects on people or food.

1.2. Precautions for devices that use R410A refrigerant

Caution:

• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Make sure the insides of the pipes are clean and do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust. Use pipes with the specified thickness. Note the following if reusing existing pipes that carried R22 refrigerant.
  – Replace the existing flare nuts and flare the flared sections again.
  – Do not use thin pipes.

• Store the pipes to be used during installation indoors and keep both ends of the pipes sealed until just before brazing. (Leave elbow joints, etc. in their packaging.) If dust, debris, or moisture enters the refrigerant lines, oil deterioration or compressor breakdown may result.

• Use ester oil, ether oil, and alkyl benzene oil (small amount) as the refrigeration oil applied to the flared sections. If mineral oil is mixed in the refrigeration oil, oil deterioration may result.

• Do not use refrigerant other than R410A refrigerant. If another refrigerant is used, the chlorine will cause the oil to deteriorate.

• Use the following tools specifically designed for use with R410A refrigerants. The following tools are necessary to use R410A refrigerant. Contact your nearest dealer for any questions.

• Be sure to use the correct tools. If dust, debris, or moisture enters the refrigerant lines, refrigeration oil deterioration may result.
• Do not use a charging cylinder. If a charging cylinder is used, the composition of the refrigerant will change and the efficiency will be lowered.

1.3. Before installation
**Caution:**

• Do not install the unit where combustible gas may leak.
  – If the gas leaks and accumulates around the unit, an explosion may result.

• Do not use the air conditioner where food, pets, plants, precision instruments, or artwork are kept.
  – The quality of the food, etc. may deteriorate.

• Do not use the air conditioner in special environments.
  – Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of the air conditioner or damage its parts.

• When installing the unit in a hospital, communication station, or similar place, provide sufficient protection against noise.
  – Inverter equipment, private power generators, high-frequency medical equipment, or radio communication equipment may cause the air conditioner to operate erroneously, or fail to operate. On the other hand, the air conditioner may affect such equipment by creating noise that disturbs medical treatment or image broadcasting.

• Do not install the unit on or over things that are subject to water damage.
  – When the room humidity exceeds 80% or when the drain pipe is clogged, condensation may drip from the indoor unit. Perform collective drainage work together with the outdoor unit, as required.

1.4. Before installation (relocation) electrical work
Caution:

• Ground the unit.
  – Do not connect the ground wire to gas or water pipes, lightning rods, or telephone ground lines. Improper grounding may result in electric shock.

• Never connect in reverse phases. Never connect the Power Line L1, L2, and L3 to Terminal N.
  – If the unit is miss wired when power is supplied, some electrical parts will be damaged.

• Install the power cable so that tension is not applied to the cable.
  – Tension may cause the cable to break and generate heat and cause a fire.

• Install a leak circuit breaker, as required.
  – If a leak circuit breaker is not installed, an electric shock may result.

• Use power line cables of sufficient current carrying capacity and rating.
  – Cables that are too small may leak, generate heat, and cause a fire.

• Use only a circuit breaker and fuse of the specified capacity.
  – A fuse or circuit breaker of a larger capacity, or the use of a substitute simple steel or copper wire may result in a general unit failure or fire.

• Do not wash the air conditioner units.
  – Washing them may cause an electric shock.

• Be careful that the installed base is not damaged by long use.
  – If the damage is left uncorrected, the unit may fall and cause personal injury or property damage.

• Install the drain piping according to this Installation Manual to ensure proper drainage. Wrap thermal insulation around the pipes to prevent condensation.
  – Improper drain piping may cause water leakage and damage to furniture and other possessions.

• Be very careful about transporting the product.
  – One person should not carry the product. Its weight is in excess of 20kg.
  – Some products use PP bands for packaging. Do not use any PP bands as a means of transportation. It is dangerous.
  – Do not touch the heat exchanger fins. Doing so may cut your fingers.
  – When transporting the outdoor unit, support it at the specified positions on the unit base. Also, support the outdoor unit at four points so that it cannot slip sideways.

• Safely dispose of the packing materials.
  – Packing materials, such as nails and other metal or wooden parts, may cause stabs or other injuries.
  – Tear apart and throw away plastic packaging bags so that children will not play with them. If children play with a plastic bag that has not been torn apart, they face the risk of suffocation.

• Be sure to install N-Line.
  – Without N-Line, it could cause damage to the unit.

1.5. Before starting the test run
Caution:

• Turn on the power at least 12 hours before starting operation.
  – Starting operation immediately after turning on the main power switch can result in irreversible damage to internal parts. Keep the power switch turned on during the operational season. Make sure of the phase order of the power supply and the voltage between each phase.

• Do not touch the switches with wet fingers.
  – Touching a switch with wet fingers can result in an electric shock.

• Do not touch the refrigerant pipes during and immediately after operation.
  – During and immediately after the operation, the refrigerant pipes may be hot or cold, depending on the condition of the refrigerant flowing through the refrigerant piping, compressor, and other refrigerant cycle parts. Your hands may suffer burns or frostbite if you touch the refrigerant pipes.

• Do not operate the air conditioner with the panels and guards removed.
  – Rotating, hot, or high-voltage parts can cause injuries.

• Do not turn off the power immediately after stopping the operation.
  – Always wait at least 5 minutes before turning off the power. Otherwise, drainage water leakage or mechanical failure of sensitive parts may occur.

• Do not touch the surface of the compressor during servicing.

1.5. Before starting the test run
Caution:

• Turn on the power at least 12 hours before starting operation.
  – Starting operation immediately after turning on the main power switch can result in irreversible damage to internal parts. Keep the power switch turned on during the operational season. Make sure of the phase order of power supply and the voltage between each phase.

• Do not touch the switches with wet fingers.
  – Touching a switch with wet fingers can result in an electric shock.

• Do not touch the refrigerant pipes during and immediately after operation.
  – During and immediately after the operation, the refrigerant pipes may be hot or cold, depending on the condition of the refrigerant flowing through the refrigerant piping,  compressor, and other refrigerant cycle parts. Your hands may suffer burns or frostbite if you touch the refrigerant pipes.

• Do not operate the air conditioner with the panels and guards removed.
  – Rotating, hot, or high-voltage parts can cause injuries.

• Do not turn off the power immediately after stopping the operation.
  – Always wait at least 5 minutes before turning off the power. Otherwise, drainage water leakage or mechanical failure of sensitive parts may occur.

• Do not touch the surface of the compressor during servicing.

**Warning:
When installing the unit, securely connect the refrigerant pipes before starting the compressor.
1.6. Test run**

• Depending on the operating conditions, the outdoor unit fan may stop while the compressor is operating, but this is not a malfunction.

About the product

• This unit uses an R410A-type refrigerant.
• Piping for systems using R410A may be different from that for systems using conventional refrigerant because the design pressure in systems using R410A is higher. Refer to the Data Book for more information.
•  Some of the tools and equipment used for installation with systems that use other types of refrigerants cannot be used with the systems using R410A. Refer to the Data Book for more information.

**Caution:**

• Do not vent R410A into the atmosphere.

Additional refrigerant charge

3.1. Calculation of additional refrigerant charge
Refrigerant for the extended piping is not included in the outdoor unit when the unit is shipped from the factory. Therefore, charge each refrigerant piping system with additional refrigerant at the installation site. In addition, in order to carry out service, enter the size and length of each liquid pipe and additional refrigerant charge amounts in the spaces provided on the “Refrigerant amount” plate on the outdoor unit.

• When the unit is stopped, charge the unit with the additional refrigerant through the liquid stop valve after the pipe extensions and indoor unit have been vacuumized. When the unit is operating, add refrigerant to the gas check valve using a safety charger. Do not add liquid refrigerant directly to the check valve.

Calculation of additional refrigerant charge

• Calculate the additional charge using the liquid pipe size and length of the extended piping and total capacity of connected indoor units.
• Calculate the additional refrigerant charge using the procedure shown to the right, and charge with the additional refrigerant.
•  For amounts less than 0.1 kg, round up the calculated additional refrigerant charge.
  (For example, if the calculated charge is 6.01 kg, round up the charge to 6.1 kg.)

< Additional Charge>
Calculation of refrigerant charge

Included refrigerant amount when shipped from the factory

Refrigerant collecting (Pump down)

Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit.

1. Turn off the circuit breaker.
2. Connect the low-pressure side of the gauge manifold to the service port of the gas side stop valve.
3. Close the liquid stop valve.
4. Supply power (circuit breaker). * Start-up of the indoor-outdoor communication takes about 3 minutes after the power (circuit breaker) is turned on. Start the pump-down operation 3 to 4 minutes after the power (circuit breaker) is turned ON.
5. Confirm that SW3-2 is set to OFF, and then set SW3-1 to ON to perform the test run for cooling operation. The compressor (outdoor unit) and ventilators (indoor and outdoor units) start operating and a test run for cooling operation begins. Immediately after performing the test run for cooling operation, set the outdoor service switch SW2-4 (pump down switch) from OFF to ON. * Do not continue to operate for a long time with the switch SW2-4 set to ON. Make sure to switch it to OFF after the pump down is completed.
6. Fully close the gas stop valve when the pressure reading on the gauge drops 0.05 – 0.00 MPa (approximately 0.5 – 0.0 kgf/cm 2 )
7. Stop the air conditioner operation (SW3-1: OFF). Set the outdoor service switch SW2-4 from ON to OFF.
8. Turn off the power supply (circuit breaker).
9. • If too much refrigerant has been added to the air conditioner system, the pressure may not drop to 0.05 MPa (0.5 kg/cm 2 ). If this occurs, use a refrigerant collecting device to collect all of the refrigerants in the system, and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have been relocated.

Warning:
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst and cause injury if any foreign substance, such as air, enters the system.

This product is designed and intended for use in residential, commercial, and light-industrial environments.

Importer:
Mitsubishi Electric Europe B.V.
Capronilaan 46, 1119 NS, Schiphol Rijk, The Netherlands
Please be sure to put the contact address/telephone number on this manual before handing it to the customer.

MITSUBISHI ELECTRIC CORPORATION
HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
BH79D827H01
Printed in Japan

Documents / Resources

| MITSUBISHI ELECTRIC PUMY-P·VKM Series Outdoor Air Conditioners [pdf] Instruction Manual
PUMY-P VKM Series, PUMY-P YKM Series, PUMY-P VKM3 Series, PUMY-P YKM3 Series, PUMY-P YKME2 Series, For use with R410A, PUMY-P VKM1 Series, PUMY-P YKM1 Series, PUMY-P VKM4 Series, PUMY-P YKM4 Series, PUMY-P YKME3 Series, PUMY-P VKM2 Series, PUMY-P YKM2 Series, Outdoor Air Conditioners, PUMY-P VKM Series Outdoor Air Conditioners
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References

• Mitsubishi Electric Klima Sistemleri
• MITSUBISHI ELECTRIC Global website
• MITSUBISHI ELECTRIC

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