18
Boiler Piping
System Piping - Radiant Heating
The heat exchanger design of the PRESTIGE
allows operation in a condensing mode. This fea-
ture requires no regulation of the return temperature
back to the boiler in radiant heating applications.
Due to the construction of the water
heater, do not install the PRESTIGE
Excellence if the boiler piping contains
non-oxygen barrier tubing if the boiler
piping is considered an “open system”.
Exposing the outer tank of the PRES-
TIGE Excellence water heater to oxygen
contamination will lead to premature
tank failure and denial of the warranty.
The boiler water supply temperature can be
maintained by the PRESTIGE, eliminating
the need for a mix system to achieve the
desired temperature.
It is recommended for the installer to install a
high temperature limit to ensure that the primary
supply temperature does not exceed the maxi-
mum allowable temperature for the radiant tub-
ing.
Size the system piping and circulator to pro-
vide the flow needed for the radiant system.
To ensure an adequate flow rate through
the PRESTIGE Excellence, the boiler
supply and return piping size must be a
minimum of 1 inch.
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 temperature.
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 medi-
um from entering into 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 means
to prevent gravity circulation of the boiler
water during cooling cycles.
System Piping - Multiple Units Installation
It is recommended to use a balanced manifold
system as the primary / secondary connection
to the space heating piping.
Maintain a minimum of 6 inches [153 mm] of
clearance between units to allow for servicing.
For the space heating piping refer to the appli-
cations mentioned in this manual or use recog-
nized design methods.
CAUTION
NOTICE
NOTICE
