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CHAPTER 4
4.8.3 Circulator
The INSTINCT Combi is supplied with a Boiler circulator
that provides circulation for central/space heating(CH)
and Domestic Hot Water (DHW) production. See the
Graph 1 on page 112 .
4.8.4 Sizing Primary Piping
See Fig. 12 on page 24 through Fig. 14 on page 26,
for recommended piping arrangements based on var-
ious applications. Size the piping and system compo-
nents required in the space heating system using rec-
ognized design methods.
4.8.5 System Piping – Zone Circulators
Connect the INSTINCT Combi to the system piping as
shown in 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
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. 12 on page 24 when zoning with zone
valves.
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.
NOTICE
NOTICE
CHAPTER 4 - BOILER PIPING
4.8.1 Expansion Tank and Makeup Water
Ensure the expansion tank is properly sized for the boil-
er volume:
• 3 gallons [12 L] for the INSTINCT Combi 155
• 4 gallons [15 L] for the INSTINCT Combi 199
the system water volume, and the system water tem-
perature.
Undersized expansion tanks will cause system
water to be lost through the pressure relief
valve and cause additional makeup water to
be added to the system. Eventual boiler heat
exchanger failure can result due to this exces-
sive makeup water addition.
The expansion tank must be located as shown in Fig. 11
on page 21 when using a primary/secondary piping
arrangement. Refer to the expansion tank manufactur-
er for additional installation details.
Connect the expansion tank to an air separator only if
the air separator is located on the suction side (inlet)
of the system circulator. Always locate and install the
system ll connection at the same location as the ex-
pansion tank connection to the system.
The expansion tank must be located directly on
the INSTINCT Combi return pipe, before the re-
turn check valve. Incorrect expansion tank loca-
tion will cause system water to be lost through
the pressure relief valve and cause additional
makeup water to be added to the system. Even-
tual boiler heat exchanger failure can result due
to this excessive makeup water addition.
4.8.2 Diaphragm Expansion Tank
Always install an automatic air vent on top of the air
separator to remove residual air from the system.
CAUTION
CAUTION
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