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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 4. Recommended heat pump piping
Initial Flushing of Piping
After installation of system piping and before connection to
the heat pump system, it is important to clean and remove
debris, weld slag, and other contamination deposited
during fabrication of the piping system.
Important: Do not flush through the heat pump modules.
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 30 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 heat pump hydronic system.
ARTC-SVX006A-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.
1. Mix the concentrate of propylene glycol in a tank or
drum for transfer into the heat pump. Use
to determine the appropriate glycol concentration for
the heat pump.
2. Mix the glycol and water externally before filling the
heat pump to prevent clogging of the heat pump piping
with a heavy concentrate.
Only after the above steps have been completed should
the water piping be connected to the 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.
Connecting Module Couplings
Install each module according to its position number
indicated on its electrical distribution cabinet. Install the
primary module first. Each secondary module has the
same installation procedure as the previous module.
Table 7, p. 37
17
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