Weil-McLain GOLD CGa Installation And Maintenance Manual page 19

Boiler Manual
Typical piping — multiple-zone installations
Figure 11
Zoning with circulators
— return water 130 °F or higher.
ZONE 2
ZONE 1
1
2
1
6
9
11
Cold
water
fill
12
59308
1 Boiler isolation (balancing) valves
Flow/check valve
2
System or zone circulator
3
Zone valve
5
Drain valve
6
Relief valve
9
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.
For systems with possible low return-water temperature (such as converted gravity systems,
radiant heating systems and heat pump systems), refer to the special piping suggestions of
Figures 13 – 17
boiler could cause corrosion of the boiler sections, resulting in severe personal injury, death or
substantial property damage.
Part Number 550-110-593/1099
1
2
3
1
13
6
10
GOLD
CGa
use an automatic air vent
, as applies. Failure to prevent sustained low return water temperature to the
Figure 12
Zoning with zone valves
— return water 130 °F or higher.
ZONE 2
ZONE 1
1
6
1
9
11
Cold
water
fill
12
59309
11 Fill valve
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
13
6
1
Alternate
circulator
location
10
GOLD
CGa
)
Figure 10.
19