MXZ2HA40VF - Air Conditioning MITSUBISHI - Free user manual and instructions

USER MANUAL MXZ2HA40VF MITSUBISHI

• This manual only describes the installation of outdoor unit. When installing the indoor unit, refer to the installation manual of indoor unit. Installationsanleitung Für INSTALLATEUR

MEANINGS OF SYMBOLS DISPLAYED ON INDOOR UNIT AND/OR OUTDOOR UNIT WARNING (Risk of re) This unit uses a ammable refrigerant. If refrigerant leaks and comes in contact with re or heating part, it will create harmful gas and there is risk of re. Read the OPERATING INSTRUCTIONS carefully before operation. Service personnel are required to carefully read the OPERATING INSTRUCTIONS and INSTALLATION MANUAL before operation. Further information is available in the OPERATING INSTRUCTIONS, INSTALLATION MANUAL, and the like. 1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY

• Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing the air conditioner.

• Be sure to observe the warnings and cautions specied 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.

1. BEFORE INSTALLATION

n Do not install the unit by yourself (user). Incomplete installation could cause re or electric shock, injury due to the unit falling, or leakage of water. Consult the dealer from whom you purchased the unit or a qualied installer. n Perform the installation securely referring to the installation manual. Incomplete installation could cause re, 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 which can bear the weight of the unit. If the installation location cannot bear the weight of the unit, the unit could fall causing injury.

Electrical work should be performed by a qualied, experienced electri- cian, according to the installation manual. Be sure to use an exclusive circuit. Do not connect other electrical appliances to the circuit. If the capacity of the power circuit is insufcient or there is incomplete electrical work, it could result in a re or an electric shock. n Do not damage the wires by applying excessive pressure with parts or screws. Damaged wires could cause re or electric shock. n 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. n Use the specied wires to connect the indoor and outdoor units securely and attach the wires rmly to the terminal block connecting sections so the stress of the wires is not applied to the sections. Do not extend the wires, or use intermediate connection. Incomplete connecting and securing could cause re. n Do not install the unit in a place where inammable gas may leak. If gas leaks and accumulates in the area around the unit, it could cause an explosion. n 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 re or an electric shock due to defective contact, defective insulation, exceeding the permissible current, etc. n Be sure to use the parts provided or specied parts for the installation work. The use of defective parts could cause an injury or leakage of water due to a re, an electric shock, the unit falling, etc. n 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 re. If loose parts are found on the power supply plug, replace it. n 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 re or an electric shock due to dust, water, etc. n When installing, relocating, or servicing the unit, make sure that no substance other than the specied refrigerant (R32) enters the refrigerant circuit. Any presence of foreign substance such as air can cause abnormal pres- sure rise and may result in explosion or injury. The use of any refrigerant other than that specied 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. n Do not discharge the refrigerant into the atmosphere. If refrigerant leaks during installation, ventilate the room. Check that the refrigerant does not leak after installation has been completed. If refrigerant leaks and comes in contact with re or heating part of such a fan heater, kerosene heater, or cooking stove, it will create harmful gas. Provide ventilation in accordance with EN378-1. n Use appropriate tools and piping materials for installation. The pressure of R32 is 1.6 times more than R22. Not using appropriate tools or materials and incomplete installation could cause the pipes to burst or injury. n 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 could be drawn in and the pressure in the refrigeration cycle could become abnormally high. This could cause the pipes to burst or injury. 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 when the stop valve is open, air could be drawn in and the pressure in the refrigeration cycle could become abnormally high. This could cause the pipes to burst or injury. n Fasten a are nut with a torque wrench as specied in this manual. If fastened too tight, a are nut may break after a long period and cause refrigerant leakage.

The unit shall be installed in accordance with national wiring regulations. n Earth the unit correctly. Do not connect the earth to a gas pipe, water pipe, lightning rod or telephone earth. Defective earthing could cause electric shock. n Be sure to install an earth leakage breaker. Failure to install an earth leakage breaker may result in electric shock or re. n When using a gas burner or other flame-producing equipment, completely remove all of the refrigerant from the air conditioner and ensure that the area is well-ventilated. If the refrigerant leaks and comes in contact in re or heating part, it will create harmful gas and there is risk of re. n Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. n The appliance shall be stored in a room without continuously oper- ating ignition sources (for example: open ames, an operating gas appliance or an operating electric heater). n Do not pierce or burn. n Be aware that refrigerants may not contain an odour. n Pipe-work shall be protected from physical damage. n The installation of pipe-work shall be kept to a minimum. n Compliance with national gas regulations shall be observed. n Keep any required ventilation openings clear of obstruction. n Do not use low temperature solder alloy in case of brazing the refriger- ant pipes. n The appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as specied for operation. n Servicing shall be performed only as recommended by the manufac- turer. Flare tool for R32, R410A Gauge manifold for R32, R410A Vacuum pump for R32, R410A Charge hose for R32, R410A Pipe cutter with reamer VG79A989H01_en.indd 1 2018/09/27 15:03:34En-2 1-2. SPECIFICATIONS Model Power supply *1 Wire specications *2 Pipe length and height difference *3, *4, *5, *6, *7, *8 Outdoor Noise level Rated Voltage Fre- quency Breaker capacity Power supply Indoor/outdoor connecting wire Max. pipe length per in- door unit / for multi-system Max. height difference *9 Max. no. of bends per in- door unit / for multi-system Cooling Heating

20 m / 30 m 15 m 20 / 30 44 dB (A) 50 dB (A) MXZ-2HA50VF 47 dB (A) 51 dB (A) CAUTION (Could lead to serious injury in particular environments when operated incorrectly.) n Install an earth leakage breaker depending on the installation place. If an earth leakage breaker is not installed, it could cause electric shock. n Perform the drainage/piping work securely according to the instal- lation manual. If there is defect in the drainage/piping work, water could drop from the unit, soaking and damaging household goods. n Do not touch the air inlet or the aluminum ns of the outdoor unit. This could cause injury. n Do not install the outdoor unit where small animals may live. If small animals enter and touch the electric parts inside the unit, it could cause a malfunction, smoke emission, or re. Also, advise user to keep the area around the unit clean. n Do not operate the air conditioner during interior construction and nishing work, or while waxing the oor. Before operating the air conditioner, ventilate the room well after such work is performed. Otherwise, it may cause volatile elements to adhere inside the air conditioner, resulting in water leakage or scattering of dew.

1-3. SELECTING OPTIONAL DIFFERENT-DIAMETER JOINTS

If the diameter of connection pipe does not match the port size of outdoor unit, use optional different-diameter joints according to the following table. (Unit: mm (inch)) Port size of outdoor unit Optional different-diameter joints (port size of outdoor unit → diameter of connection pipe) MXZ-2HA Liquid / Gas

Refer to the installation manual of indoor unit for the diameter of connection pipe of indoor unit. A, B UNIT 6.35 (1/4) / 9.52 (3/8) *1 Connect to the power switch which has a gap of 3 mm or more when open to interrupt the source power phase. (When the power switch is shut off, it must interrupt all phases.) *2 Use wires in conformity with design 60245 IEC 57. Use the indoor/outdoor connecting wire in conformity with the wire specications specied in the installation manual of the indoor unit. *3 Never use pipes with thickness less than specied. The pressure resistance will be insufcient. *4 Use a copper pipe or a copper-alloy seamless pipe. *5 Be careful not to crush or bend the pipe during pipe bending. *6 Refrigerant pipe bending radius must be 100 mm or more. *7 Insulation material : Heat resisting foam plastic 0.045 specic gravity *8 Be sure to use the insulation of specied thickness. Excessive thickness may cause incorrect installation of the indoor unit and insufcient thickness may cause dew drippage.

If the outdoor unit is installed higher than the indoor unit, max. height difference is reduced to 10 m.

1-4. SELECTING THE INSTALLATION LOCATION

• Where it is not exposed to strong wind.

• Where airow is good and dustless.

• Where rain or direct sunshine can be avoided as much as possible.

• Where neighbours are not annoyed by operation sound or hot air.

• Where rigid wall or support is available to prevent the increase of opera- tion sound or vibration.

• Where there is no risk of combustible gas leakage.

• When installing the unit, be sure to secure the unit legs.

• Where it is at least 3 m away from the antenna of TV set or radio. Opera- tion of the air conditioner may interfere with radio or TV reception in areas where reception is weak. An amplier may be required for the affected device.

• Install the unit horizontally.

• Please install it in an area not affected by snowfall or blowing snow. In areas with heavy snow, please install a canopy, a pedestal and/or some bafe boards. Note: It is advisable to make a piping loop near outdoor unit so as to reduce vibration transmitted from there. Note: When operating the air conditioner in low outside temperature, be sure to follow the instructions described below.

• Never install the outdoor unit in a place where its air inlet/outlet side may be exposed directly to 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 bafe board on the air outlet side of the outdoor unit. Avoid the following places for installation where air conditioner trouble is liable to occur.

• Where ammable gas could leak.

• Where there is much machine oil.

• Where oil is splashed or where the area is lled with oily smoke (such as cooking areas and factories, in which the properties of plastic could be changed and damaged).

• Salty places such as the seaside.

• Where sulde 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.

• The appliance shall be stored so as to prevent mechanical damage from occurring. Model Maximum amount of refrigerant charge Factory-charged refrigerant amount

• R32 is heavier than air—as well as other refrigerants—so tends to accumulate at the base (in the vicinity of the oor). If R32 accumulates around base, it may reach a ammable concentration in case room is small. To avoid ignition, maintaining a safe work environment is required by ensuring appropriate ventilation. If a refrigerant leak is conrmed in a room or an area where there is insufcient ventilation, refrain from using of ames until the work environ- ment can be improved by ensuring appropriate ventilation.

• Refrigerant pipes connection shall be accessible for maintenance purposes.

• Install outdoor units in a place where at least one of the four sides is open, and in a sufciently large space without depressions. 1-4-1. Minimum installation area for Outdoor units If you unavoidably install a unit in a space where all four sides are blocked or there are depressions, conrm that one of these situations (A, B or C) is satised. Note: These countermeasures are for keeping safety not for specication guarantee. A) Secure sufcient installation space (minimum installation area Amin). Install in a space with an installation area of Amin or more, corresponding to refrigerant quantity M (factory-charged refrigerant + locally added refrigerant). B) Install in a space with a depression height of [ 0.125 [m]. M [kg] Amin [m²]

Height from the bottom of

Height from the bottom of

Amin OK OK OK NG VG79A989H01_en.indd 3 2018/09/27 15:03:35En-4 C) Create an appropriate ventilation open area. Make sure that the width of the open area is 0.9 [m] or more and the height of the open area is 0.15 [m] or more. However, the height from the bottom of the installation space to the bottom edge of the open area should be 0.125 [m] or less. Open area should be 75% or more opening. 1-4-2. Minimum installation area for Indoor units Install in a room with a oor area of Amin or more, corresponding to refrigerant quantity M (factory-charged refrigerant + locally added refrigerant). Install the indoor unit so that the height from the oor to the bottom of the indoor unit is h0; for wall mounted: 1.8 m or more; for ceiling suspended, cassette and ceiling concealed: 2.2 m or more. There are restrictions in installation height for each model, so read the installation manual for the particular unit. M [kg] Amin [m²]

Wall mounted h0 ] 1.8 [m] Ceiling concealedCassetteCeiling suspended h0 ] 2.2 [m]h0 ] 2.2 [m]h0 ] 2.2 [m] 75% or more opening Width W 0.9 [m] or more Height from the bottom

Units should be installed by licensed contractor according to local code requirements. More than 100 mm More than 100 mm More than 200 mm if there are obstacles to both sides Open as a rule More than 500 mm if the back, both sides and top are open More than 350 mm Outdoor unit installation (Unit: mm)

Air inlet 4-10 × 21 Oval holes 304~325

Open as a rule More than 500 mm if the front and both sides are open *1 The manufacturing year and month is indicated on the spec name plate.

1-6. DRAIN PIPING FOR OUTDOOR UNIT

Please perform the drain piping work only when draining from one place.

1) Provide drain piping before indoor and outdoor piping connection.

2) Connect the soft PVC hose (L) I.D.15 mm as shown in the illustration.

3) Make sure to provide drain piping with a downhill grade for easy drain ow.

Note: Install the unit horizontally. Do not use the drain socket (1) in the cold regions. Drain may freeze and it makes the fan stop. The outdoor unit produces condensate during the heating operation. Select the installation place to ensure to prevent the outdoor unit and/or the grounds from being wet by drain water or damaged by frozen drain water. (1) Drain socket (L) Soft PVC hose When the piping is to be attached to a wall containing metals (tin plated) or metal netting, use a chemically treated wooden piece 20 mm or thicker between the wall and the piping or wrap 7 to 8 turns of insulation vinyl tape around the piping. To use existing piping, perform COOL operation for 30 minutes and pump down before removing the old air conditioner. Remake are according to the dimension for new refrigerant. After the leak test, apply insulating material tightly so that there is no gap. WARNING To avoid risk of re, embed or protect the refrigerant piping. External damage on the refrigerant piping can be cause of re. ACCESSORIES Check the following parts before installation. (1) Drain socket 1 PARTS TO BE PROVIDED AT YOUR SITE (A) Power supply cord*2 1 (B) Indoor/outdoor unit connecting wire*2

(C) Extension pipe 1 (D) Wall hole cover 1 (E) Piping tape 1 (F) Extension drain hose (or soft PVC hose, 15 mm inner diameter or hard PVC pipe VP16)

(G) Refrigeration oil Little amount (H) Putty 1 (I) Pipe xing band 2 to 7 (J) Fixing screw for (I) 2 to 7 (K) Wall hole sleeve 1 (L) Soft PVC hose, 15 mm inner diameter or hard PVC pipe VP16 for drain socket (1)

Note: *2 Place indoor/outdoor unit connecting wire (B) and power supply cord (A) at least 1 m away from the TV antenna wire. The “Q’ty” for (B) to (K) in the above table is quantity to be used per indoor unit. VG79A989H01_en.indd 5 2018/09/27 15:03:36En-6

2-1. CONNECTING WIRES FOR OUTDOOR UNIT

• Be sure to attach each screw to its correspondent terminal when securing the cord and/or the wire to the terminal block.

• Make earth wire a little longer than oth- ers. (More than 35 mm)

• For future servicing, give extra length to the connecting wires. Terminal block for power supply

1) Remove the service panel.

2) Loosen terminal screw, and connect indoor/outdoor unit connecting wire

(B) from the indoor unit correctly on the terminal block. Be careful not to make mis-wiring. 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.

3) Firmly tighten the terminal screws to prevent them from loosening. After

tightening, pull the wires lightly to conrm that they do not move.

4) Perform 2) and 3) for each indoor unit.

5) Connect power supply cord (A).

6) Fix indoor/outdoor unit connecting wire (B) and power supply cord (A)

with the cable clamps.

7) Close the service panel securely. Make sure that 3-3. PIPE CONNEC-

• After making connections between both power supply cord (A) and indoor/ outdoor unit connecting wire (B), be sure to x both cable and wire with cable clamps. Indoor/outdoor unit connecting wire <OUTDOOR UNIT> 35 mm 15 mm Lead wire Terminal block UNIT UNIT Terminal block for power supply <INDOOR UNIT> POWER SUPPLY ~/N 220-230-240 V 50 Hz Service panel

• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil applied to the ared sections.

• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses specied in the table to the 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-oxidation brazing when brazing the pipes, otherwise, the compressor will be damaged.

When installing or relocating, or servicing the air conditioner, use only the specied refrigerant (R32) 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 abnormal high pressure in the refrigerant line, and may result in an explosion and other hazards. The use of any refrigerant other than that specied for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case, this could lead to a serious impediment to securing product safety. Pipe size (mm) ø6.35 ø9.52 ø12.7 ø15.88 ø19.05 ø22.2 ø25.4 ø28.58 Thickness (mm)

• Do not use pipes thinner than those specied above.

• Use 1/2 H or H pipes if the diameter is 19.05 mm or larger.

• Be sure to have appropriate ventilation in order to prevent ignition. Furthermore, be sure to carry out re prevention measures that there are no dangerous or ammable objects in the surrounding area. VG79A989H01_en.indd 6 2018/09/27 15:03:36En-7 Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6

13.7 to 17.7 140 to 180

ø9.52 (3/8”) 22 34.3 to 41.2 350 to 420 ø12.7 (1/2”)

49.0 to 56.4 500 to 575

ø15.88 (5/8”) 29 73.5 to 78.4 750 to 800 Tilted Uneven Burred Good No good Burr Copper pipe Spare reamer Pipe cutter Smooth all around Even length all around Inside is shin- ing without any scratches. Flare nut Die Copper pipe Clutch type Flaring tool Wing nut type Copper pipe

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

2) Completely remove all burrs from the cut cross section of pipe. (Fig. 3)

• Aim the copper pipe downward while removing burrs to prevent burrs from dropping in the pipe.

3) Remove are nuts attached to indoor and outdoor units, then put them on

pipe having completed burr removal. (Not possible to put them on after aring work.)

4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown

in the table. Select A mm from the table according to the tool selected.

• Compare the ared work with Fig. 6.

• If are is noted to be defective, cut off the ared section and do aring work again.

3-3. PIPE CONNECTION

• The connected pipe size differs depending the models and the capacities of indoor units. Indoor unit capacity 25 ~ 50 Liquid pipe size ø6.35 Gas pipe size ø9.52

• Use tightening torque table above as a guideline for indoor unit side union joint section, and tighten using two wrenches. Excessive tightening dam- ages the are section.

1) Apply a thin coat of refrigeration oil (G) to the ared ends of the pipes and

the pipe connections of the outdoor unit.

2) Align the center of the pipe with that of the pipe connections of the outdoor

unit, then hand tighten the are nut 3 to 4 turns.

3) Tighten the are nut with a torque wrench as specied in the table.

• Over-tightening may cause damage to the are nut, resulting in refrigerant leakage.

• Be sure to wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite.

3-4. INSULATION AND TAPING

1) Cover piping joints with pipe cover.

2) For outdoor unit side, surely insulate every piping including valves.

3) Using piping tape (E), apply taping starting from the entry of outdoor unit.

• Stop the end of piping tape (E) with tape (with adhesive agent attached).

• When piping have to be arranged through above ceiling, closet or where the temperature and humidity are high, wind additional commercially sold insulation to prevent condensation. WARNING When installing the unit, securely connect the refrigerant pipes before starting the compressor. CAUTION When there are the ports which are not used, make sure their nuts are tightened securely. VG79A989H01_en.indd 7 2018/09/27 15:03:37En-8

4-1. PURGING PROCEDURES AND LEAK TEST

1) Remove service port cap of 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 side of the outdoor unit.

3) Run the vacuum pump. (Vacuumize for more than 15 minutes.)

4) Check the vacuum with gauge manifold valve, then close gauge

manifold valve, and stop the vacuum pump.

5) Leave as it is for one or two minutes. Make sure the pointer of gauge

manifold valve remains in the same position. Conrm that pressure gauge shows -0.101 MPa [Gauge] (-760 mmHg).

6) Remove gauge manifold valve quickly from service port of stop valve.

7) Fully open all stop valves on the gas pipe and the liquid pipe. Oper-

ating without fully opening lowers the performance and this causes trouble.

8) Refer to 1-2., and charge the prescribed amount of refrigerant if

needed. Be sure to charge slowly with liquid refrigerant. Otherwise, composition of the refrigerant in the system may be changed and affect performance of the air conditioner.

9) Tighten cap of service port to obtain the initial status.

) Leak test Stop valve for GASStop valve cap (Torque 19.6 to 29.4 N•m, 200 to 300 kgf•cm)Gauge manifold valve (for R32, R410A)Compound pressure gauge (for R32, R410A)–0.101 MPa (–760 mmHg)Handle Low Handle HighVacuum pump(for R32, R410A)*Close*OpenHexagonal wrench*4 to 5 turnsStop valve for LIQUIDPressure gauge(for R32, R410A) Precautions when using the control valve When attaching the control valve to the service port, valve core may deform or loosen if excess pressure is applied. This may cause gas leak. Service port Charge hose (for R32, R410A) Body Close Open Control valve

When attaching the control valve to the service port, make sure that the valve core is in closed position, and then tighten part A. Do not tighten part A or turn the body when valve core is in open position. Service port cap(Torque 13.7 to 17.7 N•m, 140 to 180 kgf•cm)Charge hose (for R32, R410A)

Perform gas charge to unit.

1) Connect gas cylinder to the service port of stop valve.

2) Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.

3) Replenish specied amount of the refrigerant, while operating the air

conditioner for cooling. Note: In case of adding refrigerant, comply with the quantity specied for the refrigerating cycle. CAUTION: When charging the refrigerant system with additional refrigerant, be sure to use liquid refrigerant. Adding gas refrigerant may change the composition of the refrigerant in the system and affect normal operation of the air conditioner. Also, charge the liquid refrigerant slowly, otherwise the compressor will be locked. To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm water (under 40°C) during cold season. But never use naked re or steam. Refrigerant gas cylinder operating valve(for R32, R410A)Indoor unit Charge hose (for R32, R410A)Refrigerant gas cylinder for R32, R410A with siphonElectronic scale for refrigerant chargingRefrigerant (liquid)Indoor unit UnionUnionLiquid pipeGas pipeLiquid pipeGas pipeStop valveService portOutdoor unit Gauge manifold valve (for R32, R410A)

4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

Make sure to replace the cap after the operation. WARNING To avoid risk of re, make sure that there are no ammable hazards or ignition risks before opening the stop valves. <R32>VG79A989H01_en.indd 8 2018/09/27 15:03:37En-9 4-3. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT) 4-4. LOWERING THE OPERATION NOISE OF THE OUTDOOR UNIT

• 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

2) Set the “1” of SW1 on the outdoor display board to ON to enable this function.

3) To lock the operation mode in COOL/DRY mode, set the “2” of SW1 on the

outdoor display 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.

• 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 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. Lower the operating noise [How to lower the operating noise]

1) Be sure to turn off the main power for the air conditioner before making the

2) Set the “3” of SW1 on the outdoor display board to ON to enable this function.

3) Turn on the main power for the air conditioner.

• 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 connecting wires cannot be detected. Thus, be sure to perform the test run one by one. Make sure that the following is done.

• Power is supplied to the unit.

• Stop valves are open. 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. When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmosphere.

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 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm

), 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 system, the pressure may not drop to 0.05 MPa [Gauge] (approx. 0.5 kgf/cm

), or the protec- tion function 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.

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 pipes. WARNING

4-6. 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 lters, 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.

EC DECLARATION OF CONFORMITY