Weil-McLain CGA25SPDN Boiler User Manual


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Part Number 550-101-009/0107
23
GOLD CGa Gas-Fired Water Boiler — Boiler Manual
1 "OILERISOLATIONBALANCINGVALVES
2 Flow/check valve
3 System or zone circulator
4 System temperature gauges
5 :ONEVALVE
6 $RAINVALVE
7 System temperature valves (see instructions
to the left for adjusting valves)
8 "LENDTEMPERATUREGAUGE
9 Relief valve
10 Automatic air vent (with diaphragm-type expansion
tank), or connect to tank fitting (closed-type expan-
sion tank). DO NOT use an automatic air vent when
using closed-type expansion tank. It would allow air to
leave the system, causing waterlogging of the expansion
tank.
11 Fill valve
12$IAPHRAGMTYPEORBLADDERTYPEEXPANSIONTANKIF
used (For closed-type expansion tank, pipe from top
of air separator to tank fitting as in
&IGURE)
13!IRSEPARATORANDAUTOMATICVENTIFUSED.OTETHATTHE
fill valve must always be connected to the expansion
tank, regardless of location of expansion tank, circulator
or air separator.)
Piping — low temperature systems (continued)3d
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