Weil-McLain GOLD CGa Manual page 23

GOLD CGa Gas-Fired Water Boiler — Boiler Manual
3d
Piping — low temperature systems
1
Flow/check valve
2
System or zone circulator
3
System temperature gauges
4
5
6
System temperature valves (see instructions
7
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.
11 Fill valve
12
used (For closed-type expansion tank, pipe from top
of air separator to tank fitting as in
13
fill valve must always be connected to the expansion
tank, regardless of location of expansion tank, circulator
or air separator.)
(continued)
)
23