;I;t :1_11 "J:[elll :[_ | {o] L_
II]l I :F:4:L'I0F_"]{e]L_IbV:I_1:
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 c) in Section 10 for bof]¢,_
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 i for typical expansion tank piping.
:1! I01_11;t:[q II: I1t:1eir_Jf_'li :1;t I11!:II / :1;
If the boiler is to be used in conjunction with an indirect-
fired water heater, refer to Figure 7 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:
2.
3.
4+
Glycol in hydronic applications is specially
formulated for this purpose. It includes inhibitors
which prevent the glvcol from attacking metallic
system components Make certain that the system
fluid is checked for the correct gtycol concentration
and inhibitor level.
The antifreeze solution should be tested at least once
a year and as recommended by the antifreeze
manufacturer.
Antifreeze solutions expand more than water. For
example, a 80% 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
SAFETy
RELIEF
VALVE
TO DRAIN
BALANCING
VALVE
O SYSTEM
{_ O CIRCULATOR
©
DRAIN
VALV [
ZONE VALVES
INDIRECT-FIRED
WATER HEAER
SUPPLy
TO TANK
i /
BALANONG
VALVE
SUPPLY TO
SYSTEM
q RETURN FROM
SYSTEM
HOT DOMESTIC
_WATER SUPPLy
COLD DOMESTIC
WAIER SUPPLY
Figure 7: Typical Piping with Indirect-Fired Water Heater
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