18
Typical 4 Pipe Central Heating Circuit in Conjunction with Split Saddle Boilers (Indirect Cylinder)
50
o
C
90
o
C
28mm
28mm
Gr
av
it
y
Ci
rc
ui
t Sh
oul
d be
30
%
of the Total
B
o
il
e
r Load
Col
d
Water Tank
Hot Water For
Tap
s
Expansi
on Tank
Ve
nt Pi
pes
22mm
Ma
in
s
Water
Col
d
Fi
ll
Dead
Loop
Hi
gh Pi
pe
Stat
Lo
w
Pi
pe
Stat
Dr
ai
n Poi
n
t
Ci
rc
ul
a
ti
on Pump
Diag
ram 1
3