®
WATER
BOILER
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Boiler Manual
Connect water piping
(continued)
DIAPHRAGM expansion tank (Figure 6)
s -AKESUREEXPANSIONTANKSIZEWILLHANDLEBOILERAND
system water volume and temperature. Tank must
BELOCATEDNEARBOILERBEFOREINLETTOCIRCULATOR3EE
tank manufacturer’s instructions for details.
5NDERSIZEDEXPANSIONTANKSCAUSESYSTEM
water to be lost from relief valve and
makeup water added through fill valve.
Eventual section failure can result.
CLOSED expansion tank (Figure 7)
s %NSUREEXPANSIONTANKSIZEWILLHANDLEBOILERAND
system water volume and temperature.
5NDERSIZEDEXPANSIONTANKSCAUSESYSTEM
water to be lost from relief valve and
makeup water added through fill valve.
Eventual section failure can result.
s 0ITCHANYHORIZONTALPIPINGUPTOWARDSTANKINCH
per 5 feet of piping.
&IGURE
Near-boiler piping, with diaphragm expansion tank
&IGURE
Near-boiler piping, with closed expansion tank
Part number 550-141-986/0112
15