Manual

15
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Filling The Water System
FILLING THE WATER SYSTEMS
It is imperative that the water systems are free from debris
prior to initial operation See the Water Treatment section for a
comprehensive list of precautions
Filling, Purging and Leak Testing the System
After the water systems have been properly installed a visual
inspection should be made to all joints for tightness If the chiller
is to be installed in an existing system, the cleanliness of the
existing system can be judged from the operating conditions of
the present machines The cooling tower in particular, should be
inspected and cleaned if required It is a good practice to at least
ush the existing system and ideally, to acid wash the system
before connecting a new chiller
We recommend the following sequence to ll and leak check the
water systems:
1 Close all isolation valves inside each modular chiller
2 Ensure that all drain valves are closed and that all water main
isolation valves are opened
3 The system should be lled with clean water send through a
strainer and the system checked for leaks
4 Once the main water lines and the chiller headers are lled
with clean water, purge and repeat the lling process several
times
5 Open the isolation valves inside each modular chiller and
repeat the lling process, this time also checking for leaks
inside each module
6 Following the nal lling and leak checking procedure, air
should be purged from the system
Cleaning the System
We recommend the following sequence to properly clean the
water systems:
1 If possible, install a temporary bypass line between the supply
and return water lines of both water systems prior to cleaning
the system
2 Close all isolation valves inside each modular chiller before
engaging the main water pumps
3 The pumps should be run with the strainer in place (see the
Starting the Pumps section for proper pump startup) All
external hydronic branches should be open to all devices in
the system
4 After several hours of operation, the strainer should be
isolated and cleaned
5 Step 4 should be repeated until there is no more debris being
collected by the strainer
6 Finally, open all isolation valves inside each modular chiller
and repeat step 4 and 5
If it is not possible to install the bypass line in step 1 above, it is
recommended to drain out the initial ll of water to help ush out
debris The chiller isolating valves should be closed to prevent
debris from being washed into the chiller as the water drains out
Before relling and purging the system again, the strainers should
be removed and cleaned This action should be repeated until
there is no more debris being collected by the strainer
Starting the Pumps
Follow manufacturer’s recommendations when starting the
pumps for the rst time The system should be checked for leaks
and air purged with the pumps in operation The pressure drop
across the heat exchangers will give a good indication of ow
through the system (see page 35) This should be immediately
checked against the expected pressure drop for the ow rate
required If the pressure drop begins to fall and the ow rate is
falling, this could indicate the need to clean the strainers