Weil-McLain Gold CGa - Manual (Page 21)

Part Number 550-101-009/0107
1
GOLD CGa Gas-Fired Water Boiler — Boiler Manual
1 Boiler isolation (balancing) valves
2 Flow/check valve
3 System or zone circulator (circulator should cycle
with zone valve and switches, using circulator valve
or zone control panel)
4 System temperature gauges
5 Zone valve
6 Drain valve
7 System temperature valves (see instructions to the
left for adjusting valves)
8 Blend temperature gauge
9 Relief valve
10 Automatic air vent (with diaphragm-type expansion
tank), or connect to tank fitting (closed-type expan-
sion tank).
DO NOT use an automatic air vent when
using closed-type expansion tank. It would allow
air to leave the system, causing waterlogging of the
expansion tank.
11 Fill valve
12 Diaphragm-type or bladder-type expansion tank,
if used (For closed-type expansion tank, pipe from
top of air separator to tank fitting as in
Figure 10 ,
page 1.)
13 Air separator and automatic vent, if used (Note that
the fill valve must always be connected to the expan-
sion tank, regardless of location of expansion tank,
circulator or air separator.)
Figure 13 Primary/secondary piping
Zoning with circulators
Figure 14 Primary/secondary piping
Zoning with zone valves
Piping — low temperature systems
(continued)
3d