The pre-setting of the manifold valves determines the ow in the oor heating tubes and
is therefore an important factor for obtaining
optimal hydraulic balance in the system.
A correct hydraulic balance is important if
optimal comfort shall be achieved with a minimum of energy consumption and is easily
carried out following the example shown
below.
Example
Room 1:1. Determine longest tube/largest room 25 m
2. Desired cooling (ΔT)10 °C (typical)
3. Determine heat requirement for the room150 W/m
4. Conversion factor 1,16
5. Calculation of ow for the room
150 W/m2 × 25 m
Q
=
(l/h)
10 °C × 1,16
2
323
=
l/h
Room 2: 6. Determine area for the next room15 m2
7. Calculation of ow for the room (ΔT and
heat requirement is assumed identical for
the rooms in this case)
1
1 2 3 4 5 6 7 N
150 W/m2 × 15 m
Q
=
(l/h)
10 °C × 1,16
2
193
=
l/h
0,8
0,6
0,5
0,4
0,3
2
2
Presetting the manifolds
0,2
ΔP
[bar]
0,1
0,08
0,06
0,05
0,04
0,03
0,02
0,01
1020305070 100
Q [l/h]
The diagram shows the capacities for each
heating circuit at dierent pre-settings of the
manifold valves.
200 300500 700 10002000
3000
Based on above calculations the and capacity
diagrams each manifold is pre-set by rotating
the red ring until correct value on the ring is
in-line with the sight mark on the valve