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Installation Piping
Install Piping and External
Components
Proper support of piping and pipe hangers must consider
the weight of the piping as well as the water weight inside
Figure 6. Recommended chiller/heat pump piping
Initial Flushing of Piping
After installation of system piping and before connection to
the chiller/heat pump system, it is important to clean and
remove debris, weld slag, and other contamination
deposited during fabrication of the piping system.
Typical flushing includes hot water with mild detergent
followed by a dilute phosphoric acid solution until all visible
residue is removed.
Only cleaning liquids, acids, and detergents compatible
with SAE Grade 316 stainless steel, copper, and carbon
steel should be used. Consult a professional water
treatment specialist when in doubt.
Flushing should take place across a filter/strainer with a
maximum 40 mesh screen and continue for a minimum of
six hours with frequent removal of the screen to capture
residue or until the strainer is clean.
After detergent and chemical cleaning, flush the water
piping with fresh water for one hour to remove any
remaining cleaning compounds.
Fill with Water/Glycol Solution
The installing contractor is responsible for charging glycol
into the chiller/heat pump hydronic system.
1. Mix the concentrate of propylene glycol in a tank or
drum for transfer into the chiller/heat pump. Use to
ARTC-SVX010A-EN
the pipes. A 40-mesh screen strainer must be installed in
each water/liquid system piping inlet for proper filtration an
protection of the heat exchangers. The following figure
provides a recommended installation of components.
determine the appropriate glycol concentration for the
chiller/heat pump.
2. Mix the glycol and water externally before filling the
chiller/heat pump to prevent clogging of the chiller/heat
pump piping with a heavy concentrate.
3. For chiller/heat pump systems with tank and pump
module and sealed buffer tank, fill the chiller/heat pump
using the manual fill port on the cabinet. Fill so that the
mixture reaches near the top. Stop every so often so
the fill level can be monitored.
Note: Do not use the glycol feeder pump to fill the chiller/
heat pump loop. It is not designed for continuous
use and will fail.
Only after the above steps have been completed should
the water piping be connected to the chiller/heat pump
system.
Dowfrost
Important: Dowfrost inhibited propylene glycol-based
solution is listed as chemically acceptable by
the US Department of Agriculture (USDA).
The two ingredients in Dowfrost water/glycol
mixture are generally recognized by the FDA
as safe food additives under Parts 182 and
184 of the Food Additive Regulations.
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