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Part number 550-110-260/0200
23
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 expansion
tank), or connect to tank fitting (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 fitting as in Figure 5.)
system-bypass (alternate) piping —
for converted gravity (or steam) systems
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)
Figure 13 Piping refrigeration systems
Prevent chilled water from
entering boiler
Water piping — refrigeration system3g
26018
10
Cold
water
fill
11
12
9
8
7a
7b
Alternate
circulator
location
To systemFrom system
26019
Water
chiller
Expansion tank
Circulator
Check
valve
Strainer
Boiler
Shut-off
valve
System
supply
System
return
Balancing
valve
MODEL
CGs
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 handling units
where they can be exposed to
refrigerated air, use flow control
valves or other automatic means to
prevent gravity circulation during
cooling cycle.
3f