Weil-McLain GOLD CGt Manual page 25

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4d
Piping — low temperature systems
Figure 20
1
Boiler isolation (balancing) valves
2
Flow/check valve
3
System or zone circulator
4
System temperature gauges
5
Zone valve
6
Drain valve
7
System temperature valves (see instruc-
tions on page 4 for adjusting valves)
Part Number 550-110-290/0107
By-pass piping
Zoning with circulators
Figure 21
By-pass piping
Zoning with zone valves
8
Blend temperature gauge
9
Relief valve
10
Automatic air vent
11
Fill valve
12
Diaphragm-type or bladder-type expansion tank, if used
13
Air separator and automatic vent, if used (Note that the fill valve
must always be connected to the expansion tank, at item 11.)
(continued)
5