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Part number 550-110-260/0508
23
GOLD CGs Gas-Fired Water Boiler — Boiler Manual
3 System or zone circulator
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 expan-
sion tank), or connect to tank fi tting (closed-type
expansion 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 fi tting as in Figure 5,
page 15.)
Figure 12 System-bypass piping
Zoning with zone valve or circulators,
return water 130°F or higher.
(Alternative to boiler-bypass piping
Figures 10 and 11, page 21)
Figure 13 Piping refrigeration systems
Water piping — refrigeration systems
26019
Water
chiller
Expansion tank
Circulator
Check
valve
Strainer
Boiler
Shut-off
valve
System
supply
System
return
Balancing
valve
MODEL
CGs
Prevent chilled water from entering
boiler
Install boiler so that chilled medium is piped in parallel
with the heating boiler. Use appropriate valves to prevent
chilled medium from entering boiler. See
Figure 13 for
typical installation of balancing valve and check valve.
If boiler is connected to heating coils located in air han-
dling units where they can be exposed to refrigerated
air, use fl ow control valves or other automatic means to
prevent gravity circulation during cooling cycle.
3d Piping — low temp systems (continued)
3e