Weil-McLain GOLD CGt Manual page 23

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
typical piping — multiple-zone installations
Figure 18
Zoning with circulators
— return water 130 °F or higher.
ZONE 2
ZONE 1
1
12" max
2
1
6
11
Cold
water
fill
12
071020
Boiler isolation (balancing) valves
1
2 Flow/check valve
System or zone circulator
3
Zone valve
5
6 Drain valve
Relief valve
9
Automatic air vent (with diaphragm-type
10
expansion tank), or connect to tank fitting (closed-
type expansion tank).
DO NOT
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 20 - 21
boiler could cause corrosion of the boiler sections, resulting in severe personal injury, death
or substantial property damage.
Part Number 550-110-290/0501
Figure 19
Zoning with zone valves
— return water 130 °F or higher.
1
2
3
1
13
6
3-way
water
valve
10
9
Boiler
circulator
071021
11
12
13
use an automatic air
, as applies. Failure to prevent sustained low return water temperature to the
ZONE 2
ZONE 1
1
6 6
11
Cold
fill
12
vent when using closed-type expansion tank. It
would allow air to leave the system, causing
waterlogging of the expansion tank.
Fill valve
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
page 21.)
Air separator and automatic vent, if used (Note that
the fill valve must always be connected to the
expansion tank, regardless of location of expansion
tank circulator or air separator.
1
5
13
3-way
valve
10
9
Boiler
circulator
,
Figure 17
23