MITSUBISHI ELECTRIC MXZ-3C24NA4 Split Type Air Conditioner Instruction Manual

MITSUBISHI ELECTRIC MXZ-3C24NA4 Split Type Air Conditioner

BEFORE INSTALLATION

THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY

• Be to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing the air conditioner.
• Be sure to observe the warnings and cautions specified here as they include important items related to safety.
• After reading this manual, be sure to keep it together with the OPERATING INSTRUCTIONS for future reference.

WARNING

• Do not install the unit by yourself (user). Incomplete installation could cause fire or electric shock, injury due to the unit falling, or leakage of water. Consult the dealer from whom you purchased the unit or a qualified installer.
• Perform the installation securely referring to the installation manual. Incomplete installation could cause fire or electric shock, injury due to the unit falling, or leakage of water.
• When installing the unit, use appropriate protective equipment and tools for safety. Failure to do so would cause injury
• Install the unit securely in a place that can bear the weight of the unit. If the ins allegation loa to not bear the weight of the unit, the unit o falls a us ng injury
• 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 electrical work, it could result in a fire or an electric shock.
• Do not damage the wires by applying excessive pressure with parts or screws. Damaged wires could cause fire.
• Be sure to cut off the main power in case of setting up the indoor P.C. board or wiring works. Failure to do so could cause electric shock.
• Use the specified wires to connect the indoor and outdoor units securely and attach the wires firmly to the terminal block connecting sections so the stress of the wires is not applied to the sections. Incomplete connecting and securing could cause a fire.
• Do not install the unit in a place where inflammable gas may leak. If gas leaks and accumulates in the area around the unit, it would be an ep los on.
• Do not use intermediate connection of the power cord or the extension cord and do not connect many devices to one AC outlet. It could cause a fire or an electric shock due to defective contact, defective insulation, exceeding the permit ble a rent, etc
• Be sure to 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
• When plugging the power supply plug into the outlet, make sure that there is no dust, clogging, or loose parts in both the outlet and the plug. Make sure that the power supply plug is pushed completely into the outlet. If there is dust, clogging, 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.
• Attach the electrical cover to the indoor unit and the service panel to the outdoor unit securely. If the electrical cover of the indoor unit and/or the service panel of the outdoor unit are not attached securely, it could result in a fire or an electric shock due to dust. water. etc
• When installing, relocating, or servicing the unit, make sure that no substance other than the specified refrigerant (R410A) enters the refrigerant circuit. Any presence of foreign a bs and a b as air can cause abnormal pressure rise and may result in ep los on or injury. The use of any refrigerant other than that specified for the system will cause mechanical failure, system malfunction, or unit breakdown. In the worst case, this could lead to a e serious impediments to e a ring product a safety
• Do not discharge the refrigerant into the atmosphere. If refrigerant leaks during installation, ventilate the room. If refrigerant comes in contact with a fire, harmful gas could be generated. Refrigerant leakage may a ue a flotation. Ventilate the room.
• Check that the refrigerant gas does not leak after the installation has been completed. If refrigerant gas leaks indoors, and comes into contact with the flame of a fan heater, space heater, stove, etc., harmful substances will be generated.
• Use appropriate tools and piping materials for installation. The press re of R410A is 1.6 times more than R22. Not using appropriate tools or materials and complete ins allegation to uld a ue the pipes to burs or injury
• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. If the refrigerant pipes are disconnected while the compressor is running and the stop valve is open, air o could be drawn in and the presin the refrigeration would be o uld beo abnormally high. This could cause the pipes to burst or injury.
• When installing the unit, securely connect the refrigerant pipes before starting the compressor. If the o mpres riss arted before the refrigerant pipes are connected and when the stop valve is open, air o could be drawn in and the pressure in the refrigeration would beo me abnormally high. This could cause the pipes to burst or injury.
• Fasten a flare nut with a torque wrench as specified in this manual. If fastened too tight, a flare nut may break after a long period and cause refrigerant leakage.
• The unit shall be installed by national wiring regulations.
• Ground the unit correctly. Do not connect the ground to a gas pipe, water pipe, lightning rod, or telephone ground. Defective grounding could cause electric shock.
• Be sure to install a Ground Fault Interrupt (GFI) circuit breaker. Failure to install a Ground Fault Interrupt (GFI) circuit breaker may result in electric shock or fire.
• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap between the valve stem and the valve body, resulting in injuries.
• Do not alter the unit. It may cause fire, electric shock, injury, or water leakage.

CAUTION
(Could lead to serious injury in particular environments when operated incorrectly.)

• Perform the drainage/piping work securely according to the installation manual. This could be an injury

• Do not touch the air inlet or the aluminum fins of the outdoor unit.
  If there is a defect in the drainage/piping work, water could drop from the unit, soaking and damaging the held goods

• Do not install the outdoor unit where small animals may live.
  If all animals enter and touch the electric parts inside the unit, it could cause a malfunction, smoke emission, or fire. Also, advise the user to keep the area around the unit clean.

SPECIFICATION

1. Never use pipes with a thickness less than specified. The pressure resistance will be insufficient.
2. Us an o pper pipe or an o pper-alloy & amles pipe.
3. Be careful not to crumble or bend the pipe during pipe bending.
4.  Refrigerant pipe bending radius must be 4 in. (100 mm) or more.
5. Insulation material: Heat-resisting foam plastic 0.045 specific gravity
6. Be sure to use insulation of specified thickness. Excessive thickness may cause incorrect installation of the indoor unit and insufficient thickness may cause dew drippage.
7. If pipe length exceeds 98 ft. (30 m), an additional refrigerant (R410A) charge is
8. When connecting two PAA-A18 units, be sure to provide the total piping length of 33 ft (10 m) or more and change the gas pipe diameter to 05/8 inch (15.88 mm).

SELECTING OPTIONAL DIFFERENT-DIAMETER JOINTS
If the diameter of the connect ion pipe does not match the port s e of the outdoor unit, use optional different-diameter joints according to the following table.

SELECTING THE INSTALLATION LOCATION

• Where it is not opened to strong wind.
• Where airflow is good and dustless.
• Where rain or direct sunshine can be avoided as much as possible.
• Where neighbors are not annog d by operation e und or hot air.
• Where rigid wall or support is available to prevent the increase of operation sound or vibration.
• Where there is no risk of combustible gas leakage.
• When ins calling the unit, be sure to cure the unit legs
• Where it is at least 10 ft. (3 m) away from the antenna of the TV set or radio. Opera- tion of the air conditioner may interfere with radio or TV reception in areas where reception is weak. An amplifier may be required for the affected device.
• Ins all the unit horia mentally
• Please ins all of it in an area not affected by snowfall or blowing an ow. In areas with heavy snow, please install a canopy, a pedestal, and/or some baffle boards.
  Note:
  It is advisable to make a piping loop near the outdoor unit to reduce vibration transmitted from there.

Note:
When operating the air conditioner in low outside-out temperatures, we are to follow the instructions defined below.

• Never install the outdoor unit in a place where its air inlet/outlet side may be opened directly to the wind.
• To prevent exposure to wind, install the outdoor unit with its air inlet side facing the wall.
• To prevent exposure to wind, it is recommended to install a baffle board on the air outlet side of the outdoor unit. Avoid the following places for installation where air conditioner trouble is liable to us.
• Where flammable gas could leak.
• Where there is mud mab in oil.
• Salty places a bas the seaside.
• Where sulfide gas is generated such as a hot spring.
• Where there is high-frequency or wireless equipment.
• Where there is emission of high levels of VOCs, including phthalate compounds, formaldehyde, etc., which may cause chemical cracking.

FREE SPACE REQUIRED AROUND OUTDOOR UNIT

1. Obstacles above
   When there is no doubt at e in front and on the sides of the unit, it is allowed to install the unit where an obstacle is above the unit only if the space shown in the figure is provided.

2. Front (blowing) side open
   As long as space indicated in the figure is provided, it is allowed to install the unit where the obs at es are behind and beside the unit. (No obs above the unit)

3. Obstacles in front (blowing) only
   When there is an obstacle in front of the unit as shown in the figure, open space above, behind, and on the sides of the unit is required.

4. Obstacles in front and behind
   The unit a n be used by attaching an optional outdoor blowing guide (PAC- SH96SG-E) (but both sides and top are open).

5. Obstacles in front, behind, and on side(s)

   • When installing the unit in an area that is enclosed with walls a b as a verandah, be sure to have enough space as shown below.
     In this, the air conditioning is a party, and the power of the motion might deteriorate.

   • When installing two or more units, do not install the units in front or behind each other.

6. Service space
   Provide space for service and maintenance as shown in the figure.

INSTALLATION DIAGRAM

PARTS TO BE PROVIDED AT YOUR SITE

OUTDOOR UNIT INSTALLATION

INSTALLING THE UNIT

• Be sure to fix the unit’s legs with bolts when installing it.
• Be sure to install the unit firmly to ensure that it does not fall by an earthquake or a gust.
• Refer to the figure on the right for the concrete foundation.
• Do not use the drain socket and the drain caps in the cold region. The drain may freeze and it makes the fan stop.

CONNECTING WIRES FOR OUTDOOR UNIT

• Be a reto us p ecal cra its for room air conditioner.
• Wiring work should be based on applicable technical standards.
• Wiring connections could be made following the diagram.
• Screws an ould be tightened o they won’t loosen.

1. Remove the service panel.
2. Remove the conduit plate.
3. Attach the conduit connector to the conduit plate with a lock nut then secure it to the unit with 6 news
4. Connect ground wires to the TB support.
5. Loosen the terminal screw, and connect the indoor/outdoor unit connecting wire (B) from the indoor unit correctly on the terminal block. Be careful not to make miswiring. Fix the wire to the terminal block securely so that no part of its core is appeared, and no external force is conveyed to the connecting section of the terminal block.
6. Firmly tighten the terminal screws to prevent them from loosening. After tightening, pull the wires lightly to confirm that they do not move.
7. Perform 5) and 6) for each indoor unit.
8. Connect the power supply cord (A).
9. Close the service panel securely. Make sure that 3-3. PIPE CONNECTION is completed.

Connect in order
Connect the terminal block in the following order.
A→B→C→D→p
D unit is for 4C36NA4 only

Remark:

• A disconnect switch should be required. Check the local code.
• Use a ring tongue terminal to connect a ground wire to the terminal.
• Connect wires to the matching numbers of terminals.
• Be sure to attach each screw to its correspondent terminal when securing the cord and/or the wire to the terminal block.

CONNECTING WIRES AND CONNECTING GROUND WIRE

• se e lid o ndut or Min. AWG14 or $ randed conduct or Min. AWG14.
• Use double-ins late on copper wire with 600 V in location.
• Use o papers and ors only
• Follow local electrical code.

POWER SUPPLY CABLE AND GROUND WIRE

• Use lid ors randed o ndut or Min. AWG12.
• Use proper nuts or only
• Follow local electrical code.
  WARNING:
  Use the indoor/outdoor unit connecting wire that meets the Standards to connect the indoor and outdoor units and fix the wire to the terminal block securely so that no external force is conveyed to the connecting section of the terminal block. An incomplete connection or fixing of the wire could result in a fire.
  For future servicing, give extra length to the connecting wires.

FLARING WORK AND PIPE CONNECTION

PRECAUTIONS FOR DEVICES THAT USE R410A REFRIGERANT

• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses specified in the table below. Make sure the insides of the pipes are clean and do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust.

• Always apply no-ok dating braz ng when braz ng the pipes otherwise, the o mores r will be damaged.
  WARNING:
  When installing relocating, or servicing the air conditioner, use only the specified refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any
  other refrigerant and do not allow air to remain in the lines.

• If air is mixed with the refrigerant, then it can be the cause of abnormally high pressure in the refrigerant line and may result in an explosion and other hazards.

• The use of any refrigerant other than that specified for the system will cause mechanical failure system malfunction or unit breakdown. In the worst case, this could lead to a serious impediment to securing product safety.

  • Do not use pipes thinner than those specified above.
  • Ue 1/2 H or H pipes if the diameter is 19.05 mm or larger.
  • Be sure to have appropriate ventilation to prevent ignition. Furthermore, be sure to carry out fire prevention measures so that there are no dangerous or flammable objects in the surrounding area.

FLARING WORK

1. Cut the copper pipe correctly with a pipe cutter. (Fig. 1, 2)

2. Completely remove all burrs from the cut cross-section of the pipe. (Fig. 3)
   Aim the copper pipe downward while removing burrs to prevent burrs from dropping into the pipe.

3. Remove flare nuts attached to indoor and outdoor units, then put them on the pipe having completed burr removal. (Not possible to put them on after flaring work.)

4. Flaring work (Fig. 4, 5). Firmly hold the copper pipe in the dimension shown in the table. Select A inch (mm) from the table according to the tool e-lead.

5. Check

   • Compare the flared work with Fig. 6.
   • If the flare is noted to be defective, cut off the flared section and do flaring work again.
     

PIPE CONNECTION
The o net ed pipe is e differs depending on the models and the panic ties of indoor units

1. When the diameter of o the ion pipe does not match the port side of the indoor unit, use an optional different-diameter joint.
2. Refer to the installation manual of the P series for details of MVZ-A and SVZ-KP.
3. To onnet the PAA-A18 unit, bange the gas pipe diameter to 05/8 in (15.88 mm).
   • Use the tightening torque table above as a guideline for the indoor unit side union joint section, and tighten using two wrenches. Excessive tightening damages the flare section.
   1. Do not apply refrigeration oil on screw threads. Excessive tightening torque will result in damage on the 6 new.
   2. For connection, first align the center, then tighten the first 3 to 4 turns of the flare nut by hand.
   3. Tighten the flare nut with a torque wrench as specified in the table.
   • Over-tightening may cause damage to the flare nut, resulting in refrigerant leakage.
   • Be sure to wrap the location around the piping. Direct with the bare piping may result in burns or fros bite.

INSULATION AND TAPING

1. Cover piping joints with pipe cover.
2. For the outdoor unit side, surely insulate every piping including valves.
3. Using piping tape (E), apply taping starting from the entry of the outdoor unit.
   • Stop the end of piping tape (E) with tape (with adhesive agent attached).
   • When piping has to be arranged above the ceiling, closet, or where the temperature and humidity are high, wind additional commercial ID insulation to prevent condensation.

PURGING PROCEDURES, LEAK TEST, AND TEST RUN

PURGING PROCEDURES AND LEAK TEST

1. Remove the service port cap of the stop valve on the side of the outdoor unit gas pipe (The stop valves are fully closed and covered in caps in their initial state.)
2. Connect gauge manifold valve and vacuum pump to service port of stop valve on the gas pipe de of the outdoor unit.
3. Run the vacuum pump. (Vacuumize for more than 15 minutes.)
4. Check the vacuum with the gauge manifold valve, then close the gauge manifold valve, and stop the vacuum pump.
5. Leave as it is for one or two minutes. Make sure the pointer of the gauge manifold valve remains in the same position. Confirm that the pressure gauge shows -14.7 psi [Gauge] (-0.101 MPa).
6. Remove the gauge manifold valve quickly from the service port of the stop valve.
7. After refrigerant pipes are connected and evacuated, fully open the valve stem of all stop valves on both sides of the gas pipe and liquid pipe with the hexagonal wrench. If the valve stem hits the stopper, do not turn it any further. Operating without fully opening lowers the performance and this e ue s trouble.
8. Refer to 1-2., and charge the prescribed amount of refrigerant if needed. Beware of garbage bowls with liquid refrigerant. Otherwise, the imposition of the refrigerant in the stem may be banged and affect the performance of the air conditioner.
9. Tighten the cap of the service port to obtain the initial status.
10. Leak test

GAS CHARGE
Perform gas charge to unit.

1. Connect the gas cylinder to the service port of the stop valve.
2. Perform air purge of the pipe (or hose) coming from a refrigerant gas cylinder.
3. Replenish the specified amount of refrigerant, while operating the air conditioner for cooling.
   Note:
   In case of adding refrigerant, comply with the quantity specified for the refrigerating cycle.

CAUTION:

• When charging the refrigerant with additional refrigerant, beware to use liquid refrigerant.
• Adding gas refrigerant may change the o Memphis tion of the refrigerant and affect the normal operation of the air conditioner. Also, barge the liquid refrigerant slowly, otherwise, the compressor will be locked.
• To maintain the high pressure of the gas tinder, warm the gas tinder with warm water (under 104°F (40°C)) during the cold season. But never use naked fire or steam.

LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)

• Description of the function:
  With this function, once the operation mode is locked to either COOL/DRY mode or HEAT mode, the air conditioner operates in that mode only

• Changing the setting is required to activate this function. Please explain about this function to your customers and ask them whether they want to use it.

[How to lock the operation mode]

1. Be sure to turn off the main power for the air conditioner before making the setting.
2. Set the “3” of SW1 on the outdoor controller board to ON to enable this function.
3. To lock the operation mode in COOL/DRY mode, set the “4” of SW1 on the outdoor controller board to OFF. To lock the operation in HEAT mode, set the same switch to ON.
4. Turn on the main power for the air conditioner.

LOWERING THE OPERATION NOISE OF THE OUTDOOR UNIT

• Description of the function:
  With this function, the operating noise of the outdoor unit can be lowered by reducing the operation load, for example, during nighttime in COOL mode. However, please note that the cooling and heating capacity may be lower if this function is activated.

• Changing the setting is required to activate this function. Please explain about this function to your customers and ask them whether they want to use it.

[How to lower the operating noise]

1. Be sure to turn off the main power for the air conditioner before making the setting.
2. Set the “5” of SW1 on the outdoor controller board to ON to enable this function.
3. Turn on the main power for the air conditioner.

TEST RUN

• Test runs of the indoor units should be performed individually. See the installation manual coming with the indoor unit, and make sure all the units operate properly.
• If the test run with all the units is performed at once, possible erroneous connections of the refrigerant pipes and the indoor/outdoor unit o net ing wires cannot be detected. Thus be aware to perform the test runs one by one.

About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner.

Wiring/piping correction function
This unit has a wiring/piping correction function while o rret s wiring and piping combination. When there is the possibility of no rret wiring and piping combination, and
confirming the combination is difficult, use this function to detect and correct the combination by following the procedures below.

Make sure that the following is done.

• Power is applied to the unit.

• Stop valves are open.
  Note:
  During detet ion, the operation of the indoor unit is controlled by the outdoor unit. During detection, the indoor unit automatically stops operation. This is not a male

• Proe dure
  Press the piping/wiring correction switch (SW871) 1 minute or more after turning on the power supply.

  • Correction o completed in 10 to 20 minutes When the correction is completed, it reses It is owned by LED Indie. Details are described in the following table.
  • To this function during its operation, press the piping/wiring rret ion sv itb (SW871) again.
  • When the o rret ion o completed without error, do not press the piping/wiring o rret ion switch (SW871) again.

• When the result is “Not completed”, press the piping/wiring correction switch (SW871) again to cancel this function. Then, confirm the wiring and piping combination conventionally by operating the indoor units one by one.

  • The operation is done while the power is supplied. Make sure not to contact parts other than the switch, including the P.C. board. This may cause electric shock or burn by hotpants and live parts around the switch. Contacting the live parts may cause P.C. board damage.
  • To prevent electronic control P.C. board damage, make sure to perform static elimination before operating this funt ion.
  • This function does not operate when the outside temperature is 32°F (0°C) or below.

EXPLANATION TO THE USER

• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (how to use the remote controller, how to remove the air filters, how to remove or put the remote controller in the remote controller holder, how to clean, precautions for operation, etc.).
• Recommend the user to read the OPERATING INSTRUCTIONS carefully

PUMPING DOWN

When relocating or disposing of the air conditioner, pump down the following the proe dure below e that no refrigerant is released into the top here.

1. Turn off the breaker.
2. Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.
3. Fully close the stop valve on the liquid pipe side of the outdoor unit.
4. Turn on the breaker.
5. Start the emergency COOL operation on all the indoor units.
6. When the pressure gauge shows 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), fully close the stop valve on the gas pipe side of the outdoor unit and stop the operation. (Refer to the indoor unit installation manual about the method for stopping the operation.)

• If too much refrigerant has been added to the air conditioner, the pressure may not drop to 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), or the protet ion funt ion may operate due to the pressure increase in the high-pressure refrigerant circuit. If this occurs, use a refrigerant collecting device to collect all of the refrigerant in the system, and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have been relocated. 7. Turn off the breaker. Remove the pressure gauge and the refrigerant piping.
  WARNING

  * When the refrigeration circuit leaks, do not execute the pump down with the compressor.
  * When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
  * The compressor may burst if air etc. gets into it.

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