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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
the pipes.
Figure 6.
Recommended PolyTherm chiller/heater piping
Important:
An electronic expansion valve is a butterfly
valve used on an evaporator when the
water/glycol mixture flow is variable or to
operate an 'N+1' chiller/heater module
configuration. ('N+1' is a configuration
whereby a spare module is brought on line
should an operating module fail. The spare
module's electronic expansion valve opens,
and the failed module's valve closes thereby
keeping the pressure drop and flow through
each evaporator in the system constant).
Each valve has a 24 Vac power supply
opening, closing or modulation by a 0 to 10
Vdc signal. A sensor in the water/glycol
mixture header detects temperature or
pressure via an electronic signal to the
microprocessor that in turn controls the
voltage to the valve actuator motor. The
signal is either 0 or 10 volts.
Initial Flushing of Piping
After installation of system piping and before connection
to the chiller/heater, 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
20
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.
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 chiller/heater hydronic system.These instructions
are typically for water cooled as air cooled modules have
more work space.
1. Mix the concentrate of propylene glycol in a tank or
drum for transfer into the tank. Use
Level," p. 47
to determine the appropriate glycol
concentration.
2. Mix the glycol and water externally before filling the
chiller/heater to prevent clogging of the piping with a
heavy concentrate.
3. Fill the tank 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 a glycol feeder pump to fill the
chiller/heater loop. It is not designed for
continuous use and will fail.
"Maintain Glycol
ARTC-SVX005A-EN
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