Weil-McLain UltraOil Series 3 Installation, Start-Up, And Operating Instructions Manual page 15

®
Series 3
Connect water piping
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.
Undersized expansion tanks cause system
water to be lost from relief valve and
makeup water added through fi ll valve.
Eventual section failure can result.
CLOSED expansion tank (Figure 7)
• Ensure expansion tank size will handle boiler and
system water volume and temperature.
Undersized expansion tanks cause system
water to be lost from relief valve and
makeup water added through fi ll valve.
Eventual section failure can result.
• Pitch any horizontal piping up towards tank 1 inch
per 5 feet of piping.
Part number 550-142-182/1014
— Boiler Manual
WATER BOILER
(continued)
Figure 6
Figure 7
Near-boiler piping, with diaphragm expansion tank
Near-boiler piping, with closed expansion tank
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