22
CHAPTER 4
The expansion tank must be located directly on the
EXALT Combi return pipe, before the return check
valve. Incorrect expansion tank location 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 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.
4.8.3 Circulator
The EXALT Combi is supplied with a Boiler circulator
that provides circulation for central/space heating (CH)
and Domestic Hot Water (DHW) production. See Graph
2 on page 112.
CAUTION
CHAPTER 4 - BOILER PIPING
4.8.1 Expansion Tank and Makeup Water
Ensure the expansion tank is properly sized for the
boiler volume:
• 3 gallons [12 L] for the EXALT Combi 155
• 4 gallons [15 L] for the EXALT Combi 199
the system water volume, and the system water
temperature.
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 excessive 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
manufacturer 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
expansion tank connection to the system.
CAUTION
System
Supply
Cold
Water
Fill
System
Return
T PT PT P
Optional Instinct
Combi Timesaver
EXRKIT84
Fig. 12 - EXALT Combi Near Boiler Piping - Timesaver Manifold
Optional Exalt
Combi Timesaver
EXRKIT84
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