background image

Refrigerant Piping Work (2)

4

Purging Air and Checking Gas Leakage

When piping work is completed, it is necessary to purge the air and check for gas leakage.

5

Refilling The Refrigerant

Check the machine nameplate

 for the type of refrigerant to be used

.

Precautions when adding R410A

Fill from the liquid pipe in liquid form.

It is a mixed refrigerant, so adding it in gas form may cause the refrigerant composition to change, preventing normal operation.

1) Before filling, check whether the cylinder has a siphon attached or not. (It should have something like “liquid filling 

siphon attached” displayed on it.)

2) Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.

If using additional refrigerant, perform air purging from the refrigerant pipes and indoor unit using a vacuum pump, then 
charge additional refrigerant.

Use a hexagonal wrench (3/16”) to operate the stop valve rod.

All refrigerant pipe joints should be tightened with a torque wrench at the specified tightening torque.

1) Connect projection side of charging hose (which comes from gauge manifold) to gas stop valve’s service port.

2) Fully open gauge manifold’s low-pressure valve (Lo) and completely close its high-pressure valve (Hi).

(High-pressure valve subsequently requires no operation.)

3) Apply vacuum pumping. Check that the compound pressure gauge reads –29.9in Hg.

Evacuation for 

at least 1 hour

 is recommended.

4) Close gauge manifold’s low-pressure valve (Lo) and stop vacuum pump.

(Leave as 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 check for gas leakage.
Using soapy water, check for gas leakage from indoor unit’s flare and outdoor unit’s flare and valve rods.
After the check is complete, wipe all soapy water off.

5) Remove covers from liquid stop value and gas stop valve.

7) Disconnect charging hose from gas stop valve’s service port, then fully open liquid and gas stop valves.

(Do not attempt to turn valve rod beyond its stop.)

8) Tighten valve caps and service port caps for the liquid and gas stop valves with a torque wrench at the specified 

torques. See “3 Refrigerant Piping” in “Refrigerant Piping Work (1)” for details.

1) Do not mix any substance other than the specified refrigerant (R410A) into the refrigeration cycle.
2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
3) R410A, as well as other refrigerants, should always be recovered and never be released directly into the environment.
4) Use a vacuum pump for R410A exclusively. Using the same vacuum pump for different refrigerants may damage 

the vacuum pump or the unit.

WARNING

Filling a cylinder with an attached siphon

Stand the cylinder upright when filling.

There is a siphon pipe inside, so the 
cylinder need not be upside-down to 
fill with liquid.

Filling other cylinders

Turn the cylinder upside-down 
when filling.

Summary of Contents for 3P207257-3

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 sev...

Page 2: ...he power supply Use a 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 cla...

Page 3: ...s at least 9 8 feet away from television and radio sets This is to prevent interference to images and sounds Noises may be heard even if they are 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 un...

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: ...s of the foundation bolts Prepare four sets of M12 foundation bolts nuts and washers each which are available on the market It is best to screw in the foundation bolts until their length are 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 indoor unit and the corresponding port The tot...

Page 6: ...lass Piping to each indoor unit Total length of piping between all units 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: ... III After insertion turn them about 40 clockwise 3 Connect vinyl hose on the market internal diameter of 1 inch to drain socket A If the hose is too long and hangs down fix it carefully to prevent the kinks 3 Refrigerant Piping C Drain receiver A Drain socket B Drain cap I II III Flare nut for φ1 4 Flare nut for φ3 8 Flare nut for φ1 2 Flare nut for φ5 8 10 5 12 7 ft lbf 24 1 29 4 ft lbf 36 5 44 ...

Page 8: ...as 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 ch...

Page 9: ...gerant gas pipe s surface temperature reaches 230 F max Choose heat insulation materials that will withstand this temperature 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 fl...

Page 10: ...r φ3 8 24 1 29 4 ft lbf Flare nut 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 Be sure to attach the gasket No 5 No 6 Flare nut for φ3 8 Be sure to attach the gasket No 4 No 2 Fl...

Page 11: ... 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 WARNING 1 When the protection plate is removed do not turn ON the safety breaker 2 When the service port is operated the protection p...

Page 12: ...ith the terminal board 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 leakage CB 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 Ro...

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: ...inutes 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 ...

Reviews: