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Part number 550-110-260/0200
19
Boiler Manual
primary/secondary (preferred) bypass piping —
for radiant heating or converted gravity systems
1 Boiler isolation (balancing) valves
2 Flow/check valve
3 System or zone circulator
4 System temperature gauges
5 Zone valve
6 Drain valve
7 System temperature valves (see instructions to the
left for adjusting valves)
8 Blend temperature gauge
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.)
Figure 8
Zoning with circulators
Figure 9
Zoning with zone valves
26014
10
ZONE 2
ZONE 1
1
1
1
13
1
2
2
4a 4b
3
66
7b
7a
8
12"
MAX.
Cold
water
fill
11
12
9
Alternate
circulator
location
26015
10
Cold
water
fill
11
12
9
ZONE 2
ZONE 1
12"
MAX.
1
1
1
1
5
4a 4b
3
66
8
7b
13
7a
Alternate
circulator
location