Filter
Top Products
Part number 550-110-260/0200
21
Boiler Manual
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.)
boiler-bypass (alternate) piping —
for radiant heating or converted gravity systems
Figure 10 Boiler-bypass piping
Zoning with circulators
(Alternative to primary/secondary piping
Figures 8 and 9)
Figure 11 Boiler-bypass piping
Zoning with zone valves
(Alternative to primary/secondary piping
Figures 8 and 9)
26016
10
Cold
water
fill
11
12
9
ZONE 2
ZONE 1
1
11
1
2
2
4a 4b
3
66
7b
7a
8
13
26017
10
Cold
water
fill
11
12
9
4a
8
3
4b
7a
7b
13
Alternate
circulator
location
5
11
66
ZONE 2
ZONE 1