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Lock nut

Conduit

Conduit
mounting plate

Knockout hole

Forced Operation

Wiring (1)

 1) Turn the Operation Mode switch (SW2) to “COOL.”
 2) Press the Forced Operation switch (SW1) to begin forced cooling. Press the Forced Operation switch (SW1) again to 

stop forced cooling.

Forced operation also stops automatically after 15 minutes from when operation starts.

Service PC-board

Operation Mode 
switch (SW2)

Forced Operation 
switch (SW1)

 1) Do not use spliced wires, stranded wires (

CAUTION (1)

), extension cords, or starburst connections, as they may 

cause overheating, electrical shock, or fire. Follow all local, and state electrical codes.

 2) Do not use locally purchased electrical parts inside the product. (Do not branch the power for the drain pump, 

etc., from the terminal block.) Doing so may cause electric shock or fire.

 3) Be sure to install a ground leak detector. (One that can handle higher harmonics.)

(This unit uses an inverter, which means that it must be used a ground leak detector capable handling harmonics 
in order to prevent malfunctioning of the ground leak detector itself.)

 4) Use an all-pole disconnection type breaker with at least 1/8” between the contact point gaps. 
 5) When carrying out wiring connection, take care not to pull at the conduit.
 6) Do not connect the power wire to the indoor unit. Doing so may cause electric shock or fire.

WARNING

 1) When the protection plate is removed, 

do not turn ON the safety breaker.

 2) When the service port is operated, 

the protection plate must be fixed.

WARNING

<Method of Mounting Conduit>
1) Pass wires through the conduit and 

secure them with a lock nut.

2) When connecting indoor units for 

three rooms or more, open 
knockout holes without deforming 
the conduit mounting plate.

By removing the two screws to 
remove the conduit mounting plate, 
you can work without the plate.
After completing the work, reattach 
the conduit mounting plate to its 
original position.

<Work before wiring>
A protection plate is fixed for 
protection from the high-voltage 
section.

Before starting wiring work, remove 
the two screws and the protection 
plate.

After completing wiring, fix the 
protection plate to its original position.

Protection plate

Binding band

Conduit 
mounting plate

Protection plate

Screw

Service port

Summary of Contents for Air Conditioner

Page 1: ...severe injury or death Do not ground units to water pipes telephone wires or lightning rods because incomplete grounding could cause a severe shock hazard resulting in severe injury or death and to gas pipes because a gas leak could result in an explosion which could lead to severe injury or death Do not ground units to telephone wires or lightning rods because lightning strikes could cause a seve...

Page 2: ...he power supply Use an only a separate dedicated power circuit Failure to do so may cause abnormal heat electric shock fire or equipment damage Use the specified types of wires for electrical connections between the indoor and outdoor units Follow all state and local electrical codes Firmly clamp the interconnecting wires so their terminals receive no external stresses Incomplete connections or cl...

Page 3: ...ter unit cables at least 9 8 feet from television and radios to prevent interference Noises may be heard even if more than 9 8 feet away depending on radio wave conditions 8 In coastal areas or other places with salty atmosphere of sulfate gas corrosion may shorten the life of the air conditioner 9 Since drain flows out of the outdoor unit do not place under the unit anything which must be kept aw...

Page 4: ... insulation pipe s cut line Wrap the insulation pipe with the finishing tape from bottom to top Right side plate Allow 11 13 16 inch of work space below the ceiling surface 9 13 16 inch from wall Allow space for piping and electrical servicing 13 3 4 in Clamping material Insulation tube Service lid Tape Also insulate the connection on the outdoor unit Use tape or insulating material on all connect...

Page 5: ...ation drawing fix the unit securely by means of the foundation bolts Prepare four sets of M12 foundation bolts nuts and washers each which are available as field supply It is best to screw in the foundation bolts until their length is 3 4 from the foundation surface Connections connection port Install the indoor unit according to the table below which shows the relationship between the class of in...

Page 6: ...iping to each indoor unit Total length of piping between all units 3MXS24 4MXS32 82ft max 230ft max Where a wall or other obstacle is in the path of outdoor unit s intake or exhaust airflow follow the installation guidelines below For any of the below installation patterns the wall height on the exhaust side should be 4ft or less Wall facing one side Walls facing two sides Walls facing three sides...

Page 7: ... house is too long and hangs down fix it carefully to prevent the kinks 4 Make sure that there is no water leakage from portion I II or III 3 Refrigerant Piping 1 Use the flare nut fixed to the main unit to prevent cracking and age deterioration 2 To prevent gas leakage apply refrigeration oil only to the inner surface of the flare Use refrigeration oil for R410A 3 Use torque wrenches when tighten...

Page 8: ...s is for 4 5 minutes and make sure the coupling meter needle does not go back If it does go back this may indicate the presence of moisture or leaking from connecting parts After inspecting all the connection and loosening then retightening the nuts repeat steps 2 4 6 Turn the liquid stop valve s rod 90 degrees counterclockwise with a hexagonal wrench to open valve Close it after 5 seconds and che...

Page 9: ...e 2 Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below 3 Use separate thermal insulation pipes for gas and liquid refrigerant pipes Even though the stop valve is fully closed the refrigerant may slowly leak out do not leave the flare nut removed for a long period of time CAUTION 1 Do not use mineral oil on flared part 2 Prevent mineral oil from getting...

Page 10: ...t for φ1 2 36 5 44 5 ft lbf Flare nut for φ5 8 45 6 55 6 ft lbf No 1 φ5 8 φ1 2 No 2 φ1 2 φ3 8 No 3 φ5 8 φ1 2 No 4 φ1 2 φ3 8 No 5 φ5 8 φ3 8 No 6 φ5 8 φ3 8 Gasket 1 Gasket 2 Reduce and gasket No 1 No 3 Flare nut for φ5 8 Inter unit piping Connection port of outdoor unit Connection port of outdoor unit Connection port of outdoor unit Be sure to attach the gasket No 5 No 6 Flare nut for φ3 8 Be sure t...

Page 11: ... malfunctioning of the ground leak detector itself 4 Use an all pole disconnection type breaker with at least 1 8 between the contact point gaps 5 When carrying out wiring connection take care not to pull at the conduit 6 Do not connect the power wire to the indoor unit Doing so may cause electric shock or fire WARNING 1 When the protection plate is removed do not turn ON the safety breaker 2 When...

Page 12: ...rd 3 Be sure to match the symbols for wiring and piping 4 Pull the wire and make sure that it does not disconnect Then fix the wire in place with the binding band Safety breaker Ground fault circuit interrupter breaker Outdoor unit 60Hz 208 230V Be sure to use the dedicated circuits To room B To room C To room D Use AWG 16 or AWG 14 wire for the power supply and interconnecting wires Room A Room A...

Page 13: ...ating all other indoor units do not operate and enter standby mode according to the operation mode of the set indoor unit 2 Priority during powerful operation If the indoor unit which is set for Priority Room Setting is operating at powerful the capabilities of other indoor units will be somewhat reduced Power supply gives priority to the indoor unit which is set for Priority Room Setting 3 Quiet ...

Page 14: ... will be saved Setting procedure Remove the SW5 jumper switch Once the settings are complete reset the power Install the removed jumper switch as described below This switch will be needed to later disable this setting NOTE Use the S15 connector to set the unit to only cool or heat Setting to only heat H short circuit pins 1 and 3 of the connector S15 Setting to only cool C short circuit pins 3 an...

Page 15: ...the outdoor unit service PC board However the wiring error check switch will not function for 3 minutes after the safety breaker is turned on or depending on the outside air conditions See Note 2 Approximately 15 20 minutes after the switch is pressed the errors in the connection wiring will be corrected The service monitor LEDs indicate whether or not correction is possible as shown in the table ...

Page 16: ...minutes measure the temperatures at the indoor unit inlet and outlet If the measurements are above the values shown in the table below then they are normal Items to Check During cooling operation frost may form on the gas stop valve or other parts This is normal Operate the indoor units in accordance with the included operation manual Check that they operate normally Temperature difference between...

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