Piping To Single-Zone System Using Diaphragm/Bladder-Type Tank; Piping Closed-Type Expansion Tank - Weil-McLain Gold GV Manual

• Installation • Start-Up • Parts • Maintenance
Figure 9 Piping to single-zone system using diaphragm- or bladder-type
expansion tank. Boiler connections are 1" NPT (supply from 1" tee,
return to 1" system circulator flange).
Relief valve discharge piping — see page 27
1
Isolation valves
2
Fill valve
3
Air separator
4
5 Automatic air vent (only used with
diaphragm-type expansion tanks)
Locate the air separator as shown in the suggested piping
diagram, Figures 11 through 16 on the following pages.
Pipe diaphragm- or bladder-type expansion tanks to
the bottom of the separator.
Part number 550-141-856/0703
Backflow preventer or check valve
6
System supply piping
7
System return piping
8
Diaphragm-type expansion tank —
9
always locate as shown in the suggested
piping drawings, Figures 10 through 16
Pipe closed-type (air in contact with water) tanks to
the top of the air separator. Always connect the fill line
to the expansion tank location, as shown above and in
the suggested piping.
Figure 10 Piping closed-
type expansion
tank
Pressure reducing valve
10
Quick-fill bypass valve
11
Closed-type expansion tank —
12
always locate as shown in the
suggested piping drawings,
Figures 10 through 16
Tank fitting
13
29