System Piping - Radiant Heating; System Piping - Special Application - TriangleTube PRESTIGE Excellence 110 Installation & Maintenance Manual

CHAPTER 4 - BOILER PIPING

4.14. System Piping - Radiant Heating

The heat exchanger design of the PRESTIGE Excellence
allows operation in a condensing mode. This feature re-
quires no regulation of the return water temperature
back to the boiler in radiant heating applications.
CAUTION
Do not install the PRESTIGE Excellence in a sys-
tem which is considered an open system or
contains non-oxygen barrier tubing. Exposing
the outer tank of the PRESTIGE Excellence to
oxygen contamination will lead to premature
failure of the heat exchanger and denial of the
warranty.
The boiler water supply temperature can be main-
tained by the PRESTIGE Excellence, potentially eliminat-
ing the need for a mixing system to achieve the desired
temperature if all zones of heat require the same tem-
perature set point.
It is recommended to install a high temperature limit to
ensure that the primary supply temperature does not
exceed the maximum allowable temperature for the
radiant tubing.
NOTICE
The addition of the high temperature limit is
important when the PRESTIGE Excellence has
completed a DHW call, which requires a high
primary supply water
Size the system piping and circulator to provide the
flow needed for the radiant system.
NOTICE
To ensure an adequate flow rate through the
PRESTIGE Excellence, the boiler supply and re-
turn piping size must be a minimum of 1 inch.

4.15. System Piping - Special Application

If the boiler is used in conjunction with a chilled water/
medium system, the boiler and chiller must be piped in
parallel. Install flow/check valves to prevent the chilled
medium from entering the boiler.
If the boiler is used to supply hot water to the heating
coils of an air handler where they may be exposed to
chilled air circulation, install flow/check valves or other
automatic devices to prevent gravity circulation of the
boiler water during cooling cycles.
temperature.
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