Weil-McLain UltraOil 2 Series Manual page 15

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Series 2
WATER BOILER -
Boiler Manual
Connect water piping
(continued)
DIAPHRAGM expansion tank (Figure 6)
Make sure expansion tank size will handle boiler and
system water volume and temperature. Tank must
be located near boiler before inlet to circulator. See
tank manufacturer's instructions for details.
lA
CAUTlON
I
Undersized expansion tanks cause system
water to be lost from relief valve and
makeup water added through fill valve.
Eventual section failure can result.
CLOSED expansion tank (Figure 7)
Ensure expansion tank size will handle boiler and
system water volume and temperature.
lA
CAUTlON
I
Undersized expansion tanks cause system
water to be lost from relief valve and
makeup water added through fill valve.
Eventual section failure can result.
Pitch any horizontal piping up towards tank 1 inch
per 5 feet of piping.
Part number 550-141-987/0912
Figure 6
Supply
Figure 7
Near-boiler piping, with diaphragm expansion tank
(!)outlet
@Return
®Relief valve
@
Pfpe to drain
@
Drain valve
@ Isolation valves
®
Boiler circulator
®Diaphragm-type
expansion tank
®Air separator and
auto air vent
· - By
others
• - Supplied with
boiler
Near-boiler piping, with closed expansion tank
(!)Outlet
@Return
®Relief valve
@
Pipe to drain
@
Drain valve
@ Isolation valves
®
Soller circulator
@Ciosed·type
expansion tank
®Air separator
· -By
others
· - Supplied with
boiler
15