Figure 19 By-pass piping
Zoning with circulators
Figure 20 By-pass piping
Zoning with zone valves
Piping — low temperature systems
(continued)
4d
25
Part Number
550-110-290/0219
CGt
GAS-FIRED WATER BOILER — Series 2 —
Boiler Manual
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 24 for adjusting 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.)