TriangleTube Prestige Excellence Part 1 - Manual (Page 25)

System Piping - Through Boiler
In applications in which primary/secondary
piping is not utilized and the system is zoned
with zone valves a circulator could pump
through the boiler and system directly. When
pumping through with more than one zone, a
pressure differential bypass valve is required to
avoid dead heading the pump through the post
pump feature of the control. Consult Fig. 11
and 12 page 20 for piping diagrams and Graph
2 on page 70 for proper circulator sizing.
System Piping - Radiant Heating
The heat exchanger design of the PRESTIGE
Excellence allows operation in a condensing
mode. This feature requires no regulation of
the return water temperature back to the boiler
in radiant heating applications.
The boiler water supply temperature can be
maintained by the PRESTIGE Excellence,
eliminating the need for a mix system to
achieve the desired temperature.
The installer may consider adding a high tem-
perature limit on the system piping to ensure
that the primary supply temperature does not
exceed the maximum allowable temperature
for the radiant tubing.
The addition of the high temperature
limit is important when the PRESTIGE
Excellence has completed a DHW mode,
which requires a high primary supply
water temperature.
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.
Size the system piping and circulator to provide
the flow needed for the radiant system.
To ensure adequate flow rate through
the PRESTIGE Excellence, maintain a
minimum 1 inch diameter on the system
piping connecting to the boiler.
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 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.
NOTICE
NOTICE
BEST PRACTICE
Boiler Piping
18