STIEBEL ELTRON WPF 10 User Manual

OPERATION
Menu structure
www.stiebel-eltron.com WPF | WPF cool | 19
- Room temperature-dependent return/flow temperature
with weather compensation
With this type of control, a control cascade is formed from a re-
turn/flow temperature control that is subject to both weather and
room temperature. This means that the weather-compensated
return/flow temperature control sets a default return/flow tem-
perature that is corrected by the overriding room temperature
control in accordance with the following formula:
∆ϕ
R
= (ϕ
RSOLL
− ϕ
RIST
) * S * K
Because a substantial proportion of the control is already han-
dled by the weather-compensated control, the room temperature
sensor compensation factor K can be set lower than with pure
room temperature control (K=20). The figure indicates the control
method with the set factor K=10 (room influence) and a heating
curve S=1.2.
- Room temperature control with weather-compensation
This type of control offers two significant benefits:
Incorrectly set heating curves are corrected by the room sensor in-
fluence K; whilst the smaller factor K provides more stable control.
However, observe the following for all control units with room
temperature sensor influence:
- The room temperature sensor must capture the room tem-
perature accurately.
- Open doors and windows greatly affect the control result.
- All radiator valves in the lead room must be fully open at all
times.
- The temperature inside the lead room affects the entire heat-
ing circuit.
If you want the room temperature to be taken into account, set
the room temperature sensor influence to > 0.
20
30
40
20
50
60
70
80
90
1917 18 21 22 23 24 25
0
10
0
20
-20
15
10
5
-5
-10
-15
Y
X 1
Y
X 2
1
1
1
2
3
4
5
26�03�01�1917
Y Flow temperature [°C]
X1 Room temperature [°C]
X2 Outside temperature [°C]
1 Room temperature sensor influence at K = 10 and S = 1.2
and control deviation +/- 2 K
2 Heating curve S = 1.2
3 Weather-compensated set flow temperature at ϕ
A
=
- 10°C
4 Weather-compensated set flow temperature at ϕ
A
= 0 °C
5 Weather-compensated set flow temperature at ϕ
A
= +
10°C
Room correction
This parameter enables the calibration of the actual room tem-
perature.
Pump cycles
- Heating circuit pump control
The PUMPCYCLES parameter only applies to the direct heating
circuit 1, i.e. for heating circuit pump 1.
This parameter can be set ON or OFF. In the OFF setting, the heat-
ing circuit pump will not cycle. It will operate constantly. It is only
switched off in summer mode.
As soon as this parameter is set to ON, the heating circuit pump
will be switched in line with a fixed temperature curve for the
outside temperature.
The heating circuit pump start pulse is always 5minutes.
The heating circuit pump for heating circuit 1 always starts with
each heat pump start. The pump runs on for 5 minutes after the
heat pump has been shut down. Now the start-up duration takes
effect, for example at an outside temperature of 5 °C, the pump
starts 3 times per hour for 5 minutes each time.
0 10 20 30 40 50 60
< -10
-10
-5
0
5
10
Y
2
1
84�03�01�0039
Y Outside temperature in °C
X Time in minutes
1 Pause
2 Pump run time
- Pump kick
To prevent the pumps seizing up, over summer for example, the
pumps are switched on for 10 seconds after every 24 hour period
of inactivity. This applies to all pumps.

STIEBEL ELTRON WPF 10 Specifications

General

Brand	STIEBEL ELTRON
Model	WPF 10
Category	Heat Pump
Language	English