I_ I:l;f:l:_,l: I;J;{e]i:_l,]i[o]_
1. Consult the tank manufacturer's instructions for
specific information relating to tank installation Size
the expansion tank for the required system volume
and capacity. See Table 8 in Section 10 for boiler
water capacity.
2.
Expansion tanks are available with built-in fill valves
and check valves for reducing supply water pressure
and maintaining minimum system pressure. Check
the design features of the tank and provide valves as
necessary.
Refer back to Figure 5 for typical expansion tank piping.
I::m I I£qm]I:| =[o,]iI_ :ll:t ::1e]I_l,__ii =1;t I:I_,__ii ::1
If the boiler is to be used in conjunction with an indirect-
fired water heater, refer to Figure 11 for typical piping.
Follow the instructions provided by the water heater
manufacturer. Pipe the water heater as a separate zone.
For new or existing systems that must be freeze-
protected:
Use only inhibited propylene glycol solutions of up to
50% by volume with water. Ethylene glycol is toxic
and can attack gaskets and seals used in hydronic
systems.
1.
Glycol in hydronic applications is specially
formulated for this purpose. It includes inhibitors
which prevent the glycol from attacking metallic
system components. Make certain that the system
fluid is checked for the correct glycol concentration
and inhibitor level.
2. The anitfreeze solution should be tested at least once
a year and as recommended by the antifreeze
manufacturer.
3.
4.
Antifreeze solutions expand more than water. For
example, a 50% by volume solution expands 4.8%
in volume for a temperature increase from 32°F to
180°F, while water expands 3% with the same
temperature rise. Allowance must be made for this
expansion in system design.
For more information, consult the Peerless Water
Installation Survey and the antifreeze manufacturer.
SUPPLY TO
SYSTEM
RETURN FROM
SYSTEM
ZONE VALVES
INDIRECT FIRED
WATER HEATER
HOT DOMESTIC
WATER
SUPPLY
COLD
DOMESTIC _-
WATER SUPPLY
SUPPLY
TO
TANK
J
BALANCING
VALVE
]
BALANCING
VALVE
i I
SYSTEM
CIRCULATOR _
DRAIN
Figure 1 1: Typical Piping with Indirect-Fired Water Heater
9
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