Weil-McLain GOLD CGa Manual page 21

GOLD CGa Gas-Fired Water Boiler — Boiler Manual
3d
Piping — low temperature systems
1
Flow/check valve
2
System or zone circulator (circulator should cycle
3
with zone valve and switches, using circulator valve
or zone control panel)
System temperature gauges
4
5
6
7 System temperature valves (see instructions to the
left for adjusting valves)
8
Relief valve
9
Part Number 550-101-009/0107
Automatic air vent (with diaphragm-type expansion
10
tank), or connect to tank fitting (closed-type expan-
sion tank). use an automatic air vent when
DO NOT
using closed-type expansion tank. It would allow
air to leave the system, causing waterlogging of the
expansion tank.
Fill valve
11
12
if used (For closed-type expansion tank, pipe from
top of air separator to tank fitting as in
page 17.)
13
the fill valve must always be connected to the expan-
sion tank, regardless of location of expansion tank,
circulator or air separator.)
(continued)
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21