18
CHAPTER 4
4.7.1 Expansion Tank and Makeup Water
Ensure the expansion tank is properly sized for the
boiler volume:
• 2 gallons [8 L] for the EXALT Solo 110
• 3 gallons [12 L] for the EXALT Solo 155
• 4 gallons [15 L] for EXALT Solo 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.
8 on page 17 and Fig. 9 below, when using a primary/
secondary piping arrangement or as per recognized
design methods. Refer to the expansion tank
manufacturer for additional installation details.
CAUTION
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.
4.7.2 Diaphragm Expansion Tank
Always install an automatic air vent on top of the air
separator to remove residual air from the system.
4.7.3 Closed-Type Expansion Tank
It is recommended to pitch any horizontal piping up-
wards toward the expansion tank 1 inch per 5 feet of
piping. Use 3/4” piping to the expansion tank to allow
air within the system to rise.
DO NOT install automatic air vents on a closed-type
expansion tank system. Air must remain in the system and
be returned to the expansion tank to provide an air cushion.
An automatic air vent would cause air to be vented from
the system resulting in a water-logged expansion tank.
NOTICE
Fig. 9 - Near Boiler Piping - Closely Spaced Tees
CHAPTER 4 - BOILER PIPING
System
Supply
Cold
Water
Fill
System
Return
12"
Max.
T PT P
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