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Part number 550-110-260/0200
17
Boiler Manual
typical piping — multiple-zone installations
Figure 6
Zoning with circulators
— return water 130 °F or higher.
Figure 7
Zoning with zone valves
— return water 130 °F or higher.
1 Boiler isolation (balancing) valves
2 Flow/check valve
3 System or zone circulator
5 Zone valve
6 Drain valve
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 5.)
13 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.
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 8 - 12, as applies. Failure to prevent sustained low return water temperature to the
boiler could cause corrosion of the boiler sections, resulting in severe personal injury, death
or substantial property damage.
26012
10
Cold
water
fill
11
12
9
ZONE 2
ZONE 1
1
11
2
2
3
1
6
6
13
26013
10
Cold
water
fill
11
12
9
ZONE 2
ZONE 1
1
6
11
6
1
5
13
Alternate
circulator
location