Daikin Wall Mounted Type Indoor Unit FXAQ63MAVE

Warning: Check operation is mandatory for normal unit operation. When the check operation is not executed, alarm code 'U3' will be displayed.

Set to setting mode 1 (H1P led is off) (refer to 'Setting mode 1' on page 107.)

Press and hold the TEST OPERATION button (BS4) on outdoor unit PC board for 5 seconds.

The test operation is started automatically. The following judgements are conducted within 15 minutes(about 30 minutes at the maximum).

Pipe length automatic judgement

The following indications are conducted while in test operation.

Air tight test: Make sure to use nitrogen gas.

Pressurize the liquid and gas pipes to 4.0 MPa (40 bar) (do not pressurize more than 4.0 MPa (40 bar)). If the pressure does not drop within 24 hours, the system passes the test. If the pressure drops, check where the nitrogen leaks from.

Vacuum drying: Use a vacuum pump which can evacuate to –100.7 kPa (5 Torr, –755 mm Hg)

1. Evacuate the system from the liquid and gas pipes by using a vacuum pump for more than 2 hours and bring the system to –100.7 kPa. After keeping the system under that condition for more than 1 hour, check if the vacuum gauge rises or not. If it rises, the system may either contain moisture inside or have leaks.

2. Following should be executed if there is a possibility of moisture remaining inside the pipe (if piping work is carried out during the raining season or over a long period of time, rainwater may enter the pipe during work).

After evacuating the system for 2 hours, pressurize the system to 0.05 MPa (vacuum break) with nitrogen gas and evacuate the system again using the vacuum pump for 1 hour to –100.7 kPa (vacuum drying). If the system cannot be evacuated to –100.7 kPa within 2 hours, repeat the operation of vacuum break and vacuum drying.

Then, after leaving the system in vacuum for 1 hour, confirm that the vacuum gauge does not rise.;