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Installation: Water Piping
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A typical process for installing the water piping includes:
1. Rough-in any pipe/insulation/heat trace in areas that will not be accessible
or traversable during the final installation.
2. Installation of all water piping and components.
3. Pressure testing the water side components with air to a pressure less
than 150 PSI or the pressure rating on the storage tank pressure relief
valves. Nyle recommends testing to 80-100 PSI or 1.25x the standing
pressure of the system, whichever is higher, for a minimum of two
continuous hours.
4. Find and rectify any leaks.
5. Install heat tracing and pipe insulation after the piping is determined
airtight. Note this may require a standalone pressure test of rough-in piping
so insulation and heat tracing can rough-in with the pipes.
6. Isolate the building piping from the heat pumps and storage, then use
purge valves to fill the system.
7. Purge lines by continuing to fill through isolated flow paths until fill water
exits a far point drain valve in a clean and continuous stream without
stuttering or foaming.
8. After the system has operated for 24 hours including several heat/cool
cycles of the heat pump, a final check for water leaks should be performed.
Cold Climate Filling: If the heat pump is being filled with water when
ambient temperatures may pose a freeze risk, ensure that filling the
unit DOES NOT OCCUR until the 120v power feed (or main feed, with
the unified power package) is ready, wired, and active. Unit will need
power to engage in freeze protection measures. Failure to activate the
120v power before filling it with potable water can result in complete
system failure as well as water damage or damage to the building and
other piping/components attached to the unit.
Manual Drain Down: There is a manual valve behind the condenser heat exchanger
that can be manually opened to drain down the heat pump. Water will drain into
the condensate pan and be removed by the condensate piping. Be sure isolation
valving in the building is closed before opening the manual drain valve, and close
the drain valve after water has been drained from the heat pump. See Unit Key
Component Diagram section of this manual to identify this drain valve.
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