Weil-McLain CGA25SPDN Boiler User Manual


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Part Number 550-101-009/0107
21
GOLD CGa Gas-Fired Water Boiler — Boiler Manual
1 "OILER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 :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,
page 17.)
13!IRSEPARATORANDAUTOMATICVENTIFUSED.OTETHAT
the fill valve must always be connected to the expan-
sion tank, regardless of location of expansion tank,
circulator or air separator.)
Piping — low temperature systems (continued)3d
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