Weil-McLain GOLD CGa Installation And Maintenance Manual page 23

Boiler Manual
Boiler-bypass (alternate) piping —
for radiant heating or converted gravity systems
Figure 15 Boiler-bypass piping
Zoning with circulators
(Alternative to primary/secondary piping
Figures 13 and 14)
ZONE 2
ZONE 1
1
4a
2
1
6
7a
9
11
Cold
water
fill
12
59312
Boiler isolation (balancing) valves
1
Flow/check valve
2
System or zone circulator
3
4 System temperature gauges
Zone valve
5
Drain valve
6
System temperature valves (see instructions to the left
7
for adjusting valves)
Blend temperature gauge
8
Relief valve
9
Part Number 550-110-593/1099
1
2
4b
3
13
1
6
8
7b
10
GOLD
CGa
Figure 16 Boiler-bypass piping
Zoning with zone valves
(Alternative to primary/secondary piping
Figures 13 and 14)
ZONE 2
ZONE 1
1
6
Alternate
circulator
location
7a
7b
9
4a
11
Cold
water
fill
12
3
59313
Automatic air vent (with diaphragm-type expansion
10
tank), or connect to tank fitting (closed-type
expansion tank).
DO NOT
when using closed-type expansion tank. It would
allow air to leave the system, causing waterlogging
of the expansion tank.
Fill valve
11
Diaphragm-type or bladder-type expansion tank,
12
if used (For closed-type expansion tank, pipe from
top of air separator to tank fitting as in
Air separator and automatic vent, if used (Note that
13
the fill valve must always be connected to the
expansion tank, regardless of location of expansion
tank, circulator or air separator.)
1
5
4b
13
6
8
10
GOLD
CGa
use an automatic air vent
)
Figure 10.
23