E93.1001EN.C Manual CD
+
47
9.5
Diameters – tables
General remark: diameters may never be chosen smaller than specified in the tables; flow must remain guaran-
teed.
W
ATER MANIFOLDS
Numbering according to figure 9.1, page 45:
-
Water heater-1 is the one whose hot water connection is the furthest away from the tank(s).
-
For the hot water flow pipes start numbering from D1 at water heater-1
-
For the cold water return pipes start numbering reversely: from D1 at water heater-number-last
Tables: all codes according to figure 9.1 on page 45.
The figures in the tables refer to
diameter
wall thickness (mm
mm)
of the corresponding pipe.
Diameters D1
( = OUTLET and INLET of each water heater)
1 water heater
≥
2 water heaters
CD
+
80
42
1,4
CD
+
100
54
1,5
CD
+
120
CD
+
150
CD
+
180
67
1,9
Table
A: Connections directly on the water heater(s)
Diameters D1, D2, … up to D-last-but-one
( = MUTUAL CONNECTING PIPES
between water heaters in a cascade)
D1
D2
D3
D4
D5
D6
D 7
CD
+
80
54
1,5
67
1,9
80
2,1
80
2,1
93
2,3
106
2,5 106
2,5
CD
+
100
54
1,5
67
1,9
80
2,1
93
2,3
106
2,5 106
2,5 133
2,8
CD
+
120
54
1,5
80
2,1
93
2,3
106
2,5 133
2,8 133
2,8 133
2,8
CD
+
150
54
1,5
80
2,1
93
2,3
106
2,5 133
2,8 133
2,8 159
3,0
CD
+
180
54
1,5
93
2,3
106
2,5 133
2,8 133
2,8 159
3,0 159
3,0
Table
B: Mutual connecting pipes between two or more water heaters
Diameters D
( = MAIN CONNECTING PIPES to the tank(s))
number of cascaded water heaters *
2
3
4
5
6
7
8
CD
+
80
67
1,9
80
2,1
80
2,1
93
2,3
106
2,5 106
2,5 133
2,8
CD
+
100
67
1,9
80
2,1
93
2,3
106
2,5 106
2,5 133
2,8 133
2,8
CD
+
120
80
2,1
93
2,3
106
2,5 133
2,8 133
2,8 133
2,8 159
3,0
CD
+
150
80
2,1
93
2,3
106
2,5 133
2,8 133
2,8 159
3,0 159
3,0
CD
+
180
93
2,3
106
2,5 133
2,8 133
2,8 159
3,0 159
3,0
Ø >160
* For a system with only one water heater: D = D1 (see table
A
)
Table
C: Main connecting pipes to the tank(s)
T
ANK HEADERS
The numbers in the tank table are
diameter
wall thickness (mm
mm)
of the connecting pipe to each tank
(D
T
in figure 9.2 on page 45): table see next page
→
