Daikin EWAQ050BAWN [222/223] Evaporator and condenser

Daikin EWYQ025BAWP [222/223] Evaporator and condenser
ESIE11-05 Maintenance of the Main Parts
Maintenance 211
1. 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:
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:
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.
Check the air plugs and drain plugs to prevent or detect water leakage.
Check pressure-drop and water flow.
Record temperature difference between water in/out temperature.
Inspect evaporator insulation. If damaged, repair.
Inspect water and refrigerant connections.
If the evaporator heater-tape is installed, check operation by direct power connection and
hand-touch.
Brush cleaning. Abnormal high condensing-pressures are an indication for periodic cleaning.
Unit switch box Follow the instructions below to check the unit switch box:
Check all power connections for tightness.
Check compressor motor terminals.
Inspect wiring for any signs of overheating (discolouring).
Remove all dust and debris from the switch box. Replaced coils and components should not
be left in the unit control panel.
Check all field-wired terminals.
Flow switch and
pump interlock
Follow the instructions below to check the flow switch and the pump interlock.
Check operation by ohmmeter after disconnecting the wires to the field terminals and
simulating flow and no-flow conditions.
Inspect the flow-switch for possible corrosion (glycol applications). Check electrical
connections for shunts or bridges.
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.

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