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Servicing and Maintenance
1. Dirty filter will increase the air resistance, dirty heat exchanger will reduce the cooling capacity
of the unit and blocked drain pan will cause water dripping to the ceiling of the building. In view
of that, schedule maintenance should be carried out to clean the filters, heat exchanger and
drain pan.
2. It is prohibited to operate the unit without any filter to prevent rapid blockage of heat exchanger
by dust and as a result, poor heat transfer. Thus, it is recommended to install filter at return
air duct to maintain cleanliness of aluminum fins for better and consistent heat exchange.
3. Water temperature during summer should not be lower than 5°C and not higher than 80°C
during winter. The water must be treated and ensure it is clean for optimum performance.
4. It is not recommended to adopt control that allows flowing of cool water through heat exchanger
with fan motor idle. This will cause extensive condensation occur not only on heat exchanger
but on the surface of casing due to very low air temperature in the unit. If the control do not
prevent chilled water flowing through heat exchanger during idling of fan motor, it is
recommended to close the water circuit through manual hand valve.
5. When the unit is not going to be used for extended period, the water pipes and heat exchanger
should be filled with water to reduce internal corrosion. If the unit is going to be idle throughout
the winter, the water pipe should be drained completely and anti-freeze procedure should be
adopted to prevent water pipes breakage.
Caution: Unfiltered and untreated water will cause excessive scaling, corrosion and
growing of bacteria.
Warning: Moving parts of unit and electric shock will cause serious injury or fatality to
human. Power supply to the unit must be disconnected before carrying out
any maintenance work.
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