Instinct Installation Manual

CHAPTER 4 - BOILER PIPING
18
CAUTION
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 INSTINCT Solo 110
• 3 gallons [12 L] for the INSTINCT Solo 155
• 4 gallons [15 L] for INSTINCT 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 F ig . 9 b elow , when using a pr imar y/
secondary piping arrangement or as per recognized
design methods. 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 fill 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 t o the expansion tank t o allo w
air within the system to rise.
NOTICE
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.
4.7.4 Circulator
A circulator with flow check must be utilized with the
INSTINCT Solo. The circulator, when wired directly to the
INSTINCT, will allow for domestic hot water priority and
provide circulation for the freeze protection feature of the
boiler control. See the Graphs in Chapter 19 on page 93
for pressure drop and minimum flow rate through the boiler.
Fig. 9 - INSTINCT Solo Near Boiler Piping - Closely Spaced Tees
T P
System
Supply
12"
Max.
Cold
Water
Fill
System
Return
CHAPTER 4