User guide

12
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 Event XS.
Size
Hot Water Supply Cold Water Supply
Pipe Run / Qty of Elbows
Head Loss
(mm)
Pipe Run / Qty of Elbows
Head Loss
(mm)
15 mm Pipe A x 120 ......... x 120 C x 120 ......... x 120
22 mm Pipe B x 20 ......... x 20 D x 20 ......... x 20
15 mm
Elbow
No of
Elbows
......... x 55
No of
Elbows
......... x 55
22 mm
Elbow
No of
Elbows
......... x 15
No of
Elbows
......... x 15
Add the minimum effective
head required
+80
Add the minimum effective
head required
+80
Required head of water =
x mm
Required head of water =
x mm
Example: With A = 1.5 m, B = 2.5 m, C = 2.2 m, D = 0 m.
Size
Hot Water Supply Cold Water Supply
Pipe Run / Qty of Elbows
Head Loss
(mm)
Pipe Run / Qty of Elbows
Head Loss
(mm)
15 mm Pipe A x 120 1.5 m x 120 180 C x 120 2.2 m x 120 264
22 mm Pipe B x 20 2.5 m x 20 50 D x 20 0 m x 20 0
15 mm
Elbow
No of
Elbows
3 x 55 165
No of
Elbows 3 x 55
165
22 mm
Elbow
No of
Elbows
2 x 15 30
No of
Elbows 0 x 15
0
Add the minimum effective
head required
+80
Add the minimum effective
head required
+80
Required head of water =
x mm
505
Required head of water =
x mm
509