UNIT SERVICE
HCV & HCVR Evaporative Cooling & Gas Heating
Page 18 of 26
UNIT SERVICE
B
LOWER AND
D
RIVE
C
OMPONENTS
1.
Blower motor: The ball bearings in all motors are pre-packed with grease and they require no further
attention for several years of normal operation. After this time the motor may be stripped down and
bearings washed out and repacked with standard bearing grease. (Shell Alvania N°2 or equivalent).
2.
Blower bearings (Fan Wheel bearings): These bearings leave the factory lubricated with a special long
life grease and under normal conditions should not require attention for several years.
3.
Belts: When installing and adjusting the belt or belts, loosen the motor platform adjusting bolts and
adjust until the belt can be easily deflected 12 – 20 mm. Correct belt tension and alignment is very
important as it cuts power consumption and prolongs the life of the belt and motor. When belts require
replacement the same grade of belt must be used ig: so not substitute ‘A’ section for “SPA” section.
C
OOLING
S
ECTION
THIS SECTION DETERMINES THE LIFE SPAN OF THE COOLING SECTION OF YOUR H.C.V.
1.
Turn off electric power supply.
2.
Remove pad assemblies.
3.
Check condition of Pads – use a hose to clean dirt off pads. Do not use excess water as this may make
holes in the pads. If pads are to be replaced obtain replacement pads from the manufacture.
Replacement pads are made to order.
4.
If water supply has been disconnected or turned off, reconnect and turn on to fill water tray having
brushed out any dry material. If unit has been left full of water, this should be drained out and the
water try cleaned before refiling. DO NOT add any bio-cides to the water tray after filing. Check float
valve for correct water level and operation.
5.
Check condition and tension of fan belt/s. Adjust and/or replace as necessary.
6.
Check pump operation and that bleed-off is operating correctly and not blocked.
7.
Refit pad frames and start up unit in accordance with operating instructions.
8.
Cleaning: The filter pad frames in the HCV cooling section should be periodically, cleaned. At this time
the cooler cabinet should be inspected and cleaned. Filter pads should be periodically changed, the
frequency being determined by the rapidity with which dirt, alkali and other foreign matter
accumulates in the pads to the extent that cooling efficiency is impaired. The need for changing pads
caries with the locality. If in very good condition, pads may be washed to clean away dust etc, but if
pads appear aged or badly fouled, then replace. In localities where there is an excess of lime and
alkali, the reservoir pan should be cleaned out ever 60 days. If the water is all recirculated this clean
out must be done more frequently. This will also remove dirt which has been washed out of the filter
pads.
9.
LEGIONNAIRES DISEASE: Evaporative air conditioners have not been implicated in any outbreak of
Legionnaires disease, although Legionella bacteria have been found in such systems. The water
temperature in the evaporative air cooler section is normally at about 18°C at which temperature the
Legionella bacteria (if present) will remain dormant and cannot multiply.
The following maintenance schedule is required to be followed in order to comply with the New South
Wales Public Health Act 1991 section 46:-
a.
Sumps are to be drained and cleaned at three monthly intervals or more frequently if necessary.
b.
Wetted pads are to be drained and cleaned at three monthly intervals or more frequently if
necessary.
c.
Water strainers are to be cleaned at three monthly intervals or more frequently if necessary.
d.
If any air filter is fitted, it is to be cleaned or replaced when necessary.
