Daikin Applied (UK) Ltd.
REV A
– PAGE 9. SECTION 11 ADDED. 11/03/14
Page 28 of 37
b)
Dust or foreign particles on the fins.
c)
Liquid leakage.
Heating & Cooling Coil Maintenance (continued)
Corrosion on case-work can generally be repaired and painted before significant
damage is caused.
Significant corrosion on the fins should be investigated before a complete failure occurs.
It must be established whether the correct choice of material has been made and
whether any air-borne contaminants can be prevented.
Dust on the fins will eventually reduce the efficiency of the coil. Fins can be cleaned by
blowing with low pressure compressed air or by steam blasting. This must be followed
by rinsing with clean water.
Should any foreign matter be found, then cleaning should be carried out with a high
pressure air line directed at the air leaving face of the coil. Alternatively the coil can be
washed down with a mild solution of detergent and water, after which the coil should be
thoroughly rinsed with clean water.
The power supply must be turned off before commencing any cleaning operations and
care should be taken to avoid wetting or dampening of any electrical connections.
Mechanical damage to the fins can be corrected by combing the fins with an appropriate
fin-comb.
Leakage from the tubes, or return bends, caused by freezing can be repaired if the
damage is minor. In any event the leak must be corrected before water shortage affects
other items of equipment.
Eliminators should be cleaned down using a soft brush and hot water. Any sediment
must be cleared out of the drain tray and drain pipe. Repair any areas of corrosion.
Other Recommendations
It is recommended that isolating valves be positioned close to the unit in both the inlet
and outlet lines so that the circuit can be shut down for service without emptying the
complete system.
