Mega-Stor Indirect Fired Water Heater Installation Manual
16
Because hot water is always circulated in the hot
water branch the entire branch should be insulated to
prevent excessive heat loss.
MANIFOLD DOMESTIC WATER PIP-
ING
Figure 7.10 illustrates the recommended method of
piping the domestic water side of several tanks to-
gether. All Mega-Stors are piped in a “reverse- return”
manner just like the boiler piping. This balances the
pressure drop through each tank, resulting in an even
Each tank must have its own T&P valve. It is recom-
mended that each tank be equipped with its own isola-
tion valves, unions, and drains so that one tank may
be removed from the system. If local codes require a
-
be used for tanks or each tank must be equipped with
is permitted, an expansion tank must be sized to ac-
commodate the expansion volume of all tanks.
TABLE 7.7: MINIMUM T&P VALVE SIZES
*If the Mega-Stor is connected to a boiler which has a Gross Output
LESS than the “Max. T&P Valve Capacity” shown below, install
a T&P valve having a capacity greater than or equal to the boiler’s
Gross Output.
*If the Mega-Stor is connected to a boiler which has a Gross Output
GREATER than the “Max. T&P Valve Capacity” shown below,
install a T&P valve having a capacity greater than or equal to the
“Max T&P Valve Capacity.”
Model Max T&P Valve Capacity (BTU/hr)
MS-26 172,800
MS-40 181,800
MS-53 199,800
MS-79 215,100
MS-119 445,635
MSH-40 103,344
MSH-53 145,289
*Maximum T&P valve pressure setting - 150 psi
FIGURE 7.6A: BASIC DOMESTIC WATER PIPING