
3.2.6
Circulating pump
Important
The benchmark for the most efficient circulating pumps is EEI ≤
0.20.
Main circulating pump
The main circulating pump in the indoor module is a variable speed pump.
It adapts its speed to the distribution network.
The speed of the circulating pump is controlled to reach a set point flow
rate. This set point depends on the HP069 parameter. This value is
automatically configured according to the output of the outdoor unit.
X Water flow rate (l/min)
Y Pressure available (mCE)
1 Circulating pump at 60%
2 Circulating pump at 80%
3 Circulating pump at 100%
For more information, see
Checking the minimum flow of the direct circuit, page 61
Circulating pump for second circuit
The circulating pump for the second circuit is a 3-speed pump that must
be set during commissioning to obtain the target flow rate in the second
circuit.
Variable Delta P
X Water flow rate (l/min)
Y Pressure available (mCE)
1 Circulating pump speed set to I
2 Circulating pump speed set to II
3 Circulating pump speed set to III
Constant Delta P
X Water flow rate (l/min)
Y Pressure available (mCE)
1 Circulating pump speed set to I
2 Circulating pump speed set to II
3 Circulating pump speed set to III
For more information, see
Setting the flow rate of the second circuit, page 62
Fig.4
Pressure available (circuit A)
0
1
2
3
4
5
6
7
8
9
0
5
10
15
20
25
Y
X
MW
-1
0
0
1
5
9
2
-1
1
2
3
Fig.5
Pressure available (circuit B with
radiators)
0
1
2
3
4
5
6
7
8
9
0
5
10
15
20
25
Y
X
MW
-1
0
0
1
5
9
3
-1
1
2 3
Fig.6
Pressure available (circuit B with
underfloor heating)
0
1
2
3
4
5
6
7
8
9
0
5
10
15
20
25
Y
X
MW
-1
0
0
1
5
9
4
-1
1
2 3
3 Technical specifications
18
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