Mira Extreme Thermostatic Installation And User Manual page 14

Use the table below to calculate the actual head of water (x) needed in your
installation.
A = Total length of 15 mm pipe in hot water supply pipe run *
B = Total length of 22 mm pipe in hot water supply pipe run *
C = Total length of 15 mm pipe in cold water supply pipe run *
D = Total length of 22 mm pipe in cold water supply pipe run *
* Measure from the base of the cold water cistern to the relevant inlet port on the
Mira Extreme.
Size
Pipe Run / Qty of Elbows
15 mm Pipe A x 120
22 mm Pipe B x 20
15 mm No of
Elbow Elbows
22 mm No of
Elbow Elbows
Add the minimum effective
head required
Required head of water =
x mm
Example: With A = 1.5 m, B = 2.5 m, C = 2.2 m, D = 0 m.
Size
Pipe Run / Qty of Elbows
15 mm Pipe A x 120
22 mm Pipe B x 20
15 mm No of
Elbow Elbows
22 mm No of
Elbow Elbows
Add the minimum effective
head required
Required head of water =
x mm
Hot Water Supply
Head Loss
(mm)
......... x 120
......... x 20
......... x 55
......... x 15
Hot Water Supply
Head Loss
(mm)
1.5 m x 120
2.5 m x 20
3 x 55
2 x 15
Pipe Run / Qty of Elbows
C x 120
D x 20
No of
Elbows
No of
Elbows
Add the minimum effective
+80
head required
Required head of water =
x mm
Pipe Run / Qty of Elbows
180 C x 120
50 D x 20
No of
165
Elbows
No of
30
Elbows
Add the minimum effective
+80
head required
Required head of water =
505
x mm
14
Cold Water Supply
Head Loss
(mm)
......... x 120
......... x 20
......... x 55
......... x 15
Cold Water Supply
Head Loss
(mm)
2.2 m x 120
0 m x 20
3 x 55
0 x 15
+80
264
0
165
0
+80
509