Daikin EWYQ230DAYN [459/524] Procedure to clear the refrigerant circuit in case of frozen evaporators

ESIE06-05 Procedure to Clear the Refrigerant Circuit in Case of Frozen Evaporators

Part 3 – Troubleshooting 3–59

Part 3

12 Procedure to Clear the Refrigerant Circuit in Case of

Frozen Evaporators

If water is detected in the refrigerant circuit after a evaporator damage, the following procedure should

be executed to clear the system.

Step Action

1 Cleaning & drying refrigerant circuit.

Cleaning components:

■ Suction and liquid line.

Replace components:

■ Sight glass

■ Drier filter element by high density filter

■ Compressor oil

Actions:

■ Drill a hole in the bottom of the condenser headers to remove

water.

■ Braze the drilled holes.

■ Blow dry N2 trough all the pipes.

■ Drain compressor oil

■ Vacuum the whole installation:

Check on a regular base the condition of the oil of the vacuum

pump. If the vacuum oil becomes milky, it should be replaced by

new vacuum oil. The crankcase heater must be activated. It is

advisable to connect a second heater tape at the suction of the

compressor.

■ Stop the vacuum and purge with dry nitrogen.

■ Restart the vacuum of the installation; check after a couple of

hours the condition of the vacuum oil. If OK the unit can be

recharged.

■ Charge the unit with R410A.

■ Start the unit & re-commissioning.

■ After 24 hours replace HD filter by new HD filter & replace

compressor oil.

■ Check oil contamination with measuring kit.

■ After 48 hours replace HD filter by normal filter drier + check sight

glass and pressures.

2 Find the cause of this evaporator breakdown and take the necessary

actions to prevent recurrence in the future.