Weil-McLain GOLD CGa Installation And Maintenance Manual page 25

Boiler Manual
3f
System-bypass
for converted gravity (or steam) systems
From system
Cold
water
fill
59314
3g
Water piping —
Figure 18 Piping refrigeration systems
System
supply
Circulator
System
return
59315
Part Number 550-110-593/1099
7a
8
9
11
12
Expansion tank
Shut-off
valve
Water
chiller
Strainer
Boiler
Check
valve
Balancing
valve
piping —
alternate)
To system
Figure 17 System-bypass piping
7b
Zoning with zone valve or circulators, return
water 130 °F or higher.
(Alternative to boiler-bypass piping Figures
Alternate
15 and 16)
circulator
location
3 System or zone circulator
10
7 System temperature valves (see instructions to the left for
adjusting valves)
8 Blend temperature gauge
GOLD
CGa
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 10.)
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
typical installation of balancing
valve and check valve.
If boiler is connected to heating coils
GOLD
CGa
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.
for
Figure 18
25