Comfort-Aire HWW120 - Manual (Page 9)

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Heat Controller, Inc. WATER-TO-WATER (HWW) SERIES Installation & Operation
Load Plumbing Installation
HWW Unit Load Plumbing
The applications are too varied to describe in this document.
However, some basic guidelines will be presented. Much of
the discussions on water loop applications would be valid for
the load plumbing discussion as well. All plumbing should
conform to local codes with the following considerations:
Wide temperature variation applications such as
heating/cooling coils:
- Employ piping materials that are rated for the maxi-
mum temperature and pressure combination. This
excludes PVC for most heating applications.
- Insure that load water flow in high temperature heat-
ing applications is at least 3 gpm per ton [3.9 l/m per
kW] to improve performance and reduce nuisance
high pressure faults.
- DO NOT employ plastic to metal threaded joints
- Utilize a pressure tank and air separator vent system
to equalize pressure and remove air.
Swimming Pool Hot Tub Applications:
- Load coax should be isolated with secondary heat
exchanger constructed of anti-corrosion material in all
chlorine/bromine fluid applications.
Potable Water Applications:
- Load coax material should always be vented double
walled for use in potable water systems.
- Insure load water flow in high temperature heating
applications is at least 3 gpm per ton to improve
performance and reduce nuissance to high pressure
faults.
NOTE:
Heat Controller strongly recommends all piping
connections, both internal and external to the unit, be
pressure tested by an appropriate method prior to any
finishing of the interior space or before access to all
connections is limited. Test pressure may not exceed
the maximum allowable pressure for the unit and all
components within the water system. Heat Controller
will not be responsible or liable for damages from
water leaks due to inadequate or lack of a pressurized
leak test, or damages caused by exceeding the
maximum pressure rating during installation.
Piping Installation