d) Use as few bends as possible in the pipe run. Each bend will cause extra pressure drop and
reduces the capacity of the system. Do not use more than 10 bends. For both A and B-
series chillers, locating the hydraulic kit at a far distance will also mean having a longer
water pipe length. This will incur a higher pressure head to the water pump in the chiller
unit. If not careful, this will reduce the water flow rate through the system and may cause
system failure, e.g. water freezing, compressor tripping.
Furthermore, the longer pipe will increase the cost of installation.
Always look for the closest possible locations for these two compartments.
External drain pan
In some instances, it is necessary to install an external drain pan beneath the unit to collect
any condensate water from the chiller unit. This is especially so for the heat pump versions
,where water will condense on the heat exchanger coil during the heating mode. Further more,
a lot of water will flow out during the defrost cycle.
Such external drain pans are needed when the chiller units are installed inside a plant
room where it is not appropriate for the floor to be wet. (Note A)
It is recommended that the drain pan to be fabricated out of galvanised iron (GI) sheet
metal, at least 0.8 mm in thickness. Allow the drain pan depth of about 20mm.
This external drain pan should be laid out on the floor first before placing the entire chiller
unit on top of it. It is recommended that the chiller unit to be raised up by 20 - 30mm from
the drain pan so as to prevent rusting of the chiller base pan.
Note A: Caution! Please ensure adequate ventilation in the plant room else the
chiller unit may trip.
Section 1 Page 8
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