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CHAPTER 4
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 sys-
tem as well as the INSTINCT Combi. See the Graphs on
page 112 for pressure drop and minimum ow rate
through the boiler.
Fig. 13 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. 14 on page 26 illustrates a single zone system
utilizing the boiler circulator as the system circulator.
4.8.8 System Piping – Radiant Heating
The heat exchanger design of the INSTINCT Combi al-
lows operation in a condensing mode. This feature re-
quires no regulation of the return water temperature
back to the boiler in radiant heating applications. The
INSTINCT CANNOT be installed with non-oxygen bar-
rier tubing.
The boiler water supply temperature can be main-
tained by the INSTINCT Combi, potentially eliminating
the need for a mixing system to achieve the desired
temperature if all zones of heat require the same tem-
perature 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 im-
portant if the INSTINCT 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.
NOTICE
To ensure an adequate flow rate through the
INSTINCT Combi, the boiler supply and return
piping size must be a minimum of 1-1/4 inch
for the INSTINCT 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 (mixing device, cas-
cading, etc.) are possible with INSTINCT Solo and Com-
bi Units, provided an optional wiring kit is used. Please
refer to Fig. 10 on page 20 for more information.
NOTICE
CHAPTER 4 - BOILER PIPING
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