Install Instructions

CG i GAS-FIRED wATER BOILER- sERIEs a- Boiler Manual
4d Piping - low temperature systems < conlinued )
Figure
20 Primary/secondary piping
Z on i ng wt th circulators
Figure
21 Pri mary/seconda ry piping
Zoning w1t h zo ne valves
..- ----------f-zo"Ne2--'--------- .. ----·,
1 '"---------~ 1
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10
1 Boil er isolation (bala ncin g) va l ve s
2 Flow/ check valve
3 System or zone c ir culator
4 System te mp erature gauges
5 Zone val ve
8 Dr a in val ve
7 System temper atur e va l ve s (see ins tru c-
tions to the left for adjusting valves}
8 Bl e nd te mp era tur e gauge
71023
710 22
9 Relief valve
10 Au toma tic air ve nt {wi th di aphragm-type expansion tank), or
co nn e ct to tank fitting ( cl ose d-typ e expansion tank ). DO NOT
use an automatic air vent when using d osed-type expansion tank.
It
would allow a ir to leave the system, causi ng waterlogging of
the expan sion tan k.
11 Fill valve
12 Di ap hr a gm-t ype or bladder- ty pe expansion tank , if used (For
dosed -type expansion tank, pipe from t op of a ir separator to
tank fitting as in Figure 17 .}
13 Air separator and a ut omatic ve nt , if us ed (Note th at th e fill valve
must always be connected to the expansi on tank , regardless of
locat ion of exp an sion tank, circulator or a ir separator.)
Part Nu mber 550-142-780/0712 25