Daikin EWAD300MBYNN [438/452] Maintenance of the main parts

Maintenance ESIE05-07

5–4 Part 5 – Maintenance

1.2 Maintenance of the Main Parts

Preventive

maintenance

A program of scheduled maintenance should be set up and followed. The items mentioned are to be

used as a guide and must be used in combination with sound electrical and refrigeration workmanship

to ensure trouble free operation and performance.

Unit Casing Follow the below instructions to check the unit casing.

Compressor Follow the instructions below to check the compressor:

P Check crankcase heater operation. Switch of the compressor and carefully touch the crankcase

heater area by hand.

No operation can cause compressor damage when the ambient temperature reaches a low

temperature.

Evaporator and

condenser

Follow the instructions below to check the evaporator and condenser:

P Inspect the water and condenser after the first operating season. This condition indicates the

required frequency of cleaning and also whether water treatment is needed in the chilled water

circuit.

P Check the air plugs and drain plugs to prevent or detect water leakage.

P Check pressure-drop and water flow.

P Record temperature difference between in / out and water out/ refrigerant temperature.

P Inspect evaporator insulation. If damaged, repair.

P Inspect water and refrigerant connections.

P If the evaporator heater-tape is installed, check operation by direct power connection and

hand-touch.

P Brush cleaning. Abnormal high condensing-pressures are an indication for periodic cleaning.

Unit switchbox Follow the instructions below to check the unit switchbox:

P Check all power connections for tightness.

P Check compressor motor terminals.

P Inspect wiring for any signs of overheating (discolouring).

P Remove all dust and debris from the switchbox. Replaced coils and components should not be left

in the unit control panel.

P Check all field-wired terminals.

Check if... If not, then...

The paint of the unit casing is

intact.

Touch-up with paint.

All plate work is screwed down in

position.

Screw the plate work down in position.

ESIE05-07.book Page 4 Wednesday, October 11, 2006 10:42 AM