Weil-McLain Gold CGi Series 2 User Manual page 29

Boiler Manual
4f
system-bypass (alternate) piping —
for converted gravity (or steam) systems
From system
Cold
water
fill
4g
Water piping —
Figure 25 Piping refrigeration systems
System
supply
Circulator
System
return
71027
Part Number 550-110-710/0200
7a
8
9
11
12
3
71026
Expansion tank
Shut-off
valve
Water
chiller
Strainer
Boiler
Check
valve
Balancing
valve
To system
Figure 24 System-bypass piping
7b
Zoning with zone valve or circulators, return
water 130 °F or higher.
(Alternative to boiler-bypass piping
Alternate
Figures 22 and 23)
circulator
location
10 3 System or zone circulator
7 System temperature valves (see instructions to the left for
adjusting valves)
8
Blend temperature gauge
MODEL
CGi
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 17.)
refrigeration system
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
for typical installation of balancing
valve and check valve.
If boiler is connected to heating
coils located in air handling units
MODEL
CGi
where they can be exposed to
refrigerated air, use flow control
valves or other automatic means to
prevent gravity circulation during
cooling cycle.
Figure 25
29