Instinct Installation Manual

CHAPTER 4 - BOILER PIPING
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4.8.4 Sizing Primary Piping
See Fig. 15 on page 29 Fig. 11 on page 21 through Fig.
15 on page 26 , for recommended piping arrangements
based on various applications. Size the piping and sys-
tem components required in the space heating system
using recognized design methods.
4.8.5 System Piping – Zone Circulators
Connect the INSTINCT 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.
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.
4.8.6 System Piping – Zone Valves
Connect the INSTINCT Combi to the system piping as shown
in
Fig. 15 on page 29 when zoning with zone valves.
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.
4.8.7 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 flow 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
Graph 2 on page 104 for pressure drop and minimum
flow 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 differential
valve must be installed on the syst em piping .
Fig. 15 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
allo ws operation in a condensing mode . T his f eature
requires no regulation of the return water temperature
back to the boiler in radiant heating applications. The
design and construction of the INSTINCT 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 INSTINCT 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.
NOTICE
The addition of a high temperature limit is
important 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
flow 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 flow/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 flow/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 configurations (cascading, etc.) are
possible with INSTINCT Solo Units, provided an optional
wiring kit is used. Please refer to Fig. 10 on page 20
for more information.
CHAPTER 4