System Piping - Zone Valves; System Piping - Radiant Heating; System Piping - Special Applications; System Piping - Multiple Units Installation - Prestige Solo 175 Installation And Maintenance Manual

Boiler Piping

System Piping - Zone Valves

Connect the PRESTIGE to the system piping as
shown in Fig. 11 page 22 when zoning with
zone valves. The primary / secondary piping
ensures that the boiler loop has sufficient flow.
NOTICE
To ensure adequate flow rate through
the PRESTIGE, maintain a minimum 1-
1/4 inch diameter on the system piping
connecting the unit to and from the pri-
mary / secondary connection.
System Piping - Through Boiler
In new or retrofit applications in which
primary/secondary arrangement is not utilized, the
PRESTIGE allows flexibility in available system
pressure loss due to a lower boiler pressure drop,
see Graph 1 and/or Graph 2, page 68.
Figure 12, page 23 illustrates a multiple zone
valve with a single system/boiler circulator. A
by-pass loop with a pressure differential valve
must be installed on the system piping.
Figure 13, page 23 illustrates a single zone utiliz-
ing the boiler circulator as the system circulator.

System Piping - Radiant Heating

The heat exchanger design of the PRESTIGE
allows operation in a condensing mode. This
feature requires no regulation of the return
temperature back to the boiler in radiant heat-
ing applications.
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 add a
high temperature limit as shown in Fig.14 page
24. This will 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 if the PRESTIGE is
connected to a domestic hot water sys-
tem, which requires a high primary sup-
ply water temperature.
Size the system piping and circulator to provide
the flow needed for the radiant system.
NOTICE
To ensure adequate flow rate through
the PRESTIGE, maintain a minimum 1-
1/4 inch diameter on the system piping
connecting the unit to and from the pri-
mary / secondary connection.
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

Use a Pre-Fab manifold system as the prima-
ry / secondary connection to the space heating
piping as shown in Fig. 15 page 25.
Maintain a minimum of 6 inches [153 mm] of
clearance between units to allow for servic-
ing.
Refer to Figs. 7 and 8 page 19 to install air sep-
arator and expansion tank.
For the space heating piping refer to the appli-
cations mentioned in this manual or use recog-
nized design methods.
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