Installation, Operation and Maintenance Manual
C13-Series
15
Subject to change without notice.
10.20-IM (0818)
Maintenance Procedures
Filters
Do NOT run unit without filters.
Throw-away filters are supplied which are an Underwriters
Laboratories Class 2 pleated extended surface type� Filters
should be checked monthly for dirt accumulation and
changed when necessary. Replacement filters must be the
same type as originally supplied�
In some situations, an external filter box will be incorporated
or included in the mixing box�
UNIT
FILTER SIZE/TYPE
QUANTITY
2 & 3 Ton
25 X 20 X 2
1
4 & 5 Ton
20 X 16 X 2
2
6 & 8 Ton
20 X 16 X 2
4
Figure 8: Filter Sizes And Types
INFORMATION
NOTE: Unit must be shut off at the
disconnect switch before the filters are
serviced. Be sure to check that the air flow
direction arrows on the filters point in the
correct direction of airflow.
Cleaning The Water-Cooled
Condenser
Cleaning a water cooled condenser helps to improve
the heat transfer rate, reduce operational cost, restore
efficiency, prolong heat exchanger life, and reduce pressure
drop pumping cost� Deposits from water or water treatments,
such as scale, lime, rust, or mud are removed�
Each installation is unique. Therefore, the fluid quality and
operating conditions will dictate when the heat exchanger
needs to be cleaned�
For future reference, it may be beneficial during the startup
to record the water pressure drop across as well as the inlet
and outlet water temperatures of the water condenser� After
a period of time these values can be checked to see how
much loss of operating performance has occurred� If a 10%
or greater change has occurred it would be beneficial to
clean the heat exchanger�
A 5% solution of Phosphoric Acid or Oxalic Acid can be
considered for cleaning� However, there are several other
commercially available environmentally safe products on
the market that will do an excellent job� Contact your local
wholesaler for availability� Follow all safety guidelines
published by the cleaner manufacturer�
There is a safety concern whenever using any chemical
cleaner at elevated temperatures� The cleaner manufacturers
recommend using the cleaners at 120°F or lower� Since the
heat exchanger might be in operation just prior to the cleaning,
it should be cooled to lower than the 120°F threshold� Due
to the ability of the heat exchangers mass to hold heat, this
may take a period of time� If possible, circulate cool water
through the unit to help dissipate some of the heat�
Check each field installed component to ensure the chemical
cleaner will not damage them when the cleaner is circulated�
For example, the structural makeup of the strainer may not
stand up to the chemical detergent and rapidly deteriorate or
fail to function after cleaning� If there is a possibility of this
happening, use an alternative cleaner that all components
will withstand or create another method of circulating the
cleaner that would isolate the component in question from
the cleaner� While cleaning the heat exchanger, it may also
be a good idea to check and clean the strainer as well�
INFORMATION
NOTE: Do not chemically clean a
refrigerant circuit�
1�
Record performance values (Ref� following charts)�
Turn off the fluid source.
2�
Cool the heat exchanger, if above 120°F�
3�
Close the valves to and from the fluid circuit loop.
4�
Open the drain valve and drain all fluid from the heat
exchanger�
5�
Back flush the heat exchanger to remove any loose
particles�
6�
Attach pump and hoses as illustrated below, making
sure all fittings and connections are secure.
7�
Check all valving to make sure valves to system are
closed and valves for cleaning loop are open�
8�
Calculate the total gallons volume of the heat
exchanger and the piping using the following charts:
Summary of Contents for C13-Series
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