Weil-McLain GOLD CGS 550-110-260/0508 User Manual page 21

GOLD CGs Gas-Fired Water Boiler — Boiler Manual
3d
Piping — low temp systems
Figure 10
Boiler isolation (balancing) valves
1
Flow/check valve
2
System or zone circulator
3
System temperature gauges
4
Zone valve
5
6 Drain valve
System temperature valves (see instructions to the left
7
for adjusting valves)
Blend temperature gauge
8
Relief valve
9
Part number 550-110-260/0508
Boiler-bypass piping
Zoning with circulators
Alternative to primary/secondary piping
Figures 8 and 9)
(continued)
Figure 11 Boiler-bypass piping
Zoning with zone valves
(Alternative to primary/secondary piping
Figures 8 and 9)
Automatic air vent (with diaphragm-type expan-
10
sion tank), or connect to tank fi tting (closed-type
expansion tank).
DO NOT
vent when using closed-type expansion tank. It
would allow air to leave the system, causing wa-
terlogging of the expansion tank.
Fill valve
11
12 Diaphragm-type or bladder-type expansion tank,
if used (For closed-type expansion tank, pipe from
top of air separator to tank fi tting as in
page 15.)
Air separator and automatic vent, if used (Note
13
that the fi ll valve must always be connected to the
expansion tank, regardless of location of expansion
tank, circulator or air separator.)
use an automatic air
,
Figure 5
21