Primary - Secondary Pump System
There may be instances when the integrated pump in the mini chiller is not able to deliver the
required head pressure to the load in a close piping system.
To overcome this problem:
1. Change the water pump with a higher head pressure capability.
Please consult with the factory as to the requirements. Calculate the required
head pressure and select suitable replacement pump.
2. Install a booster pump.
It is recommended that this booster pump to be installed as a primary - secondary
system; as follows:
A
B
Primary pump in
chiller unit
Secondary booster pump
Bypass loop
Load
More than one secondary pumps can be installed together, e.g to serve several zones.
There are two drawbacks to this system:
a) Cost - additional two or more pumps are required
b) The bypass chilled water is sent back to the chiller unused
Keep the bypass loop as short and large as practical possible. Do not put any valve in
this loop. This is to minimise the pressure loss between the entry and exit points of the
loop.
However, this length must be sufficient to prevent recirculation turbulence.
Section 2 Page 15
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