Mira Extreme Thermostatic, Installation & User Manual

Page: 12 / 44

12
505 509
Size
Pipe Run/Quantity of
Elbows
Head
L o s s
( m m )
15 mm
Pipe
22 mm
Pipe
22 mm
Elbow
Hot Water Supply
Cold Water Supply
No. of
Elbows
x 15
B x 20 x 20
x 120
A x 120
Pipe Run/Quantity of
Elbows
Head
L o s s
( m m )
No. of
Elbows
x 15
D x 20 x 20
x 120 C x 120
+80
Add the minimum
effective head required.
+80
Required head
of water – x mm
15 mm
Elbow
No. of
Elbows
x 55
No. of
Elbows
x 55
3 3
165
165
1.5 m 180
2.2 m
264
2.5 m
50
2
30
0 m
0
0 0
Size
Pipe Run/Quantity of
Elbows
Head
L o s s
( m m )
15 mm
Pipe
22 mm
Pipe
22 mm
Elbow
Add the minimum
effective head required.
Hot Water Supply Cold Water Supply
No. of
Elbows
x 15
B x 20
x 20
x 120 A x 120
Pipe Run/Quantity of
Elbows
Head
L o s s
( m m )
No. of
Elbows
x 15
D x 20
x 20
x 120 C x 120
+80
Add the minimum
effective head required.
+80
Required head
of water – x mm
Required head
of water – x mm
15 mm
Elbow
No. of
Elbows
x 55
No. of
Elbows
x 55
3.11. Long pipe runs and excessive use of 90° elbows will significantly reduce the
head available to supply the Mira Extreme. If the effective head is less than
80 mm
:
3.11.1. The expected flow rate may not be achieved.
3.11.2. Air may be drawn into the hot supply from the vent pipe, causing
spluttering and temperature fluctuations at the handset.
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.
Example: With A = 1.5 m, B = 2.5 m, C = 2.2 m, D = 0 m.
Add the minimum
effective head required.
Required head
of water – x mm