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CHAPTER 4
4.8.4 Sizing Primary Piping
See Fig. 11 on page 21 through Fig. 15 on page 26, for
recommended piping arrangements based on various
applications. Size the piping and system components
required in the space heating system using recognized
design methods.
4.8.5 System Piping – Zone Circulators
Connect the EXALT Combi to the system piping as
shown in Fig. 13 on page 24 when zoning with zone
circulators.
The installer must provide a separate circulator for each
zone of space heating.
To ensure an adequate flow rate through the EXALT
Combi, the boiler supply and return piping size must
be a minimum of 1-1/4 inch for the EXALT Combi
155/199.
4.8.6 System Piping – Zone Valves
Connect the EXALT Combi to the system piping as shown in
Fig. 13 on page 24 when zoning with zone valves.
To ensure an adequate flow rate through the
EXALT Combi, the boiler supply and return
piping size must be a minimum of 1-1/4 inch
for the EXALT Combi 155/199.
4.8.7 System Piping – Through Boiler
Primary / secondary piping is preferred, but is not re-
quired for smaller systems (1 to 3 zones) provided that
at least the minimum ow rate through the boiler is
maintained at all times. The internal circulator must be
able to overcome the pressure drop through the system
as well as the EXALT Combi. See the Graphs on page 112
for pressure drop and minimum ow rate through the
boiler.
Fig. 13 on page 24 and Fig. 14 on page 25 illustrates a
multiple zone valve system with a single system/boiler
circulator. A by-pass loop with a pressure dierential
valve must be installed on the system piping.
Fig. 15 on page 26 illustrates a single zone system
utilizing the boiler circulator as the system circulator.
NOTICE
NOTICE
4.8.8 System Piping – Radiant Heating
The heat exchanger design of the EXALT Combi 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 design
and construction of the EXALT Solo heat exchanger
allows the installation of the boiler on systems with non
- oxygen barrier tubing.
The boiler water supply temperature can be maintained
by the EXALT Combi, potentially eliminating the need
for a mixing system to achieve the desired temperature
if all zones of heat require the same temperature
setpoint.
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.
The addition of a high temperature limit is
important if the EXALT Combi is connected to
a domestic hot water system, which requires a
high primary supply water temperature.
Size the system piping and circulator to provide the
ow needed for the radiant system.
To ensure an adequate flow rate through the
EXALT Combi, the boiler supply and return
piping size must be a minimum of 1-1/4 inch
for the EXALT Combi 155/199.
4.8.9 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 ow/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 ow/check valves or other
automatic devices to prevent gravity circulation of the
boiler water during cooling cycles.
4.9. Optional System Piping and Cascading
Several additional congurations (cascading, etc.) are
possible with EXALT Solo Units, provided an optional
wiring kit is used. Please refer to Fig. 10 on page 20 for
more information.
NOTICE
NOTICE
CHAPTER 4 - BOILER PIPING
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