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Parameter
Explanation
Freeze
Minimum outlet temperature from the heat pump
protection
into the environment circuit at which operation
is stopped in order to prevent the brine from
freezing.
Enable
If "On" is selected here and no control is connec-
emergency
ted (e.g. due to a defect), it is possible to adjust
mode
a target flow value and select an operating mode
in the basic menu in order to operate the heat
pump in limp home mode.
Software
The version number for the main PCB (HMU
version
xxxx) and the display (AI xxxx) are shown here
alternately.
Additional setting data is listed in the appendix.
8.3
Setting the high-efficiency pumps
8.3.1
Setting the building circuit pump
Automatic mode
At the factory, the nominal volume flow is automatically
achieved by volume flow regulation. This volume flow
regulation allows for efficient operation of the heating pump
because the pump speed is adjusted to the hydraulic resist-
ance of the system. Vaillant recommends that you retain this
setting.
Manual operation
[ mbar ]
700
600
500
400
5 K /460 l/h (VWS)
300
200
100
0
30
40
50
60
Menu → Installer level → Configuration → Building circuit
pump conf.
If you do not want to operate the pump in automatic mode,
you can set the manual mode in the Configuration menu.
The diagram shows how setting the pump actuation affects
the remaining feed head at nominal volume flow for a tem-
perature spread of 5 K on the heating side.
Setting the maximum differential pressure in the
building circuit
If the differential pressure in the building circuit is not permit-
ted to exceed a maximum value, this limit can be set in the
Configuration menu within the range of 0.02 to 0.07 MPa
(0.2 to 0.7 bar).
Menu → Installer level → Configuration → Max. remaining
feed head
8.3.2
Setting the environment circuit pump
If the heat source temperature spread lies below 2 K due to
low pressure losses (large pipe cross-sections, low drilling
depth) in continuous operation, you can adjust the pump out-
put. The following diagram shows how setting the pump ac-
0020250180_00 geoTHERM Installation and maintenance instructions
Adapting the unit to the heating installation 8
70
80
90
100 [ % ]
tuation affects the remaining feed heads at nominal volume
flows for a heat source temperature spread of 3 K.
[ mbar ]
700
600
500
400
3K / 620 l/h (VWS)
300
200
100
0
30
40
50
60
The default setting for the environment circuit pump is 75%.
8.4
Setting the flow temperature in heating
mode (with no control connected)
1.
Activate manual operation.
–
Menu → Installer level → Configuration → Enable
limp home mode
2.
Press the right-hand selection button
◁
The display shows the flow temperature in heating
mode.
3.
Use the minus button
to change the flow temperature in heating
mode.
–
Max. heating mode flow temperature: 55 ℃
(131.0 ℉)
4.
Confirm the change by pressing the right-hand selection
button
("OK").
8.5
Setting the flow temperature in cooling
mode (with no controller connected)
1.
Activate manual operation.
–
Menu → Installer level → Configuration → Enable
limp home mode
2.
Press the right-hand selection button
twice.
◁
The display shows the value of the flow temperature
in cooling mode.
3.
Use the minus button
to change the flow temperature in cooling
mode.
4.
Confirm the change by pressing the right-hand selection
button
("OK").
Note
At the factory, the target flow temperature
can be set between 20 °C and 16 °C in cool-
ing mode.
70
80
90
100 [ % ]
("
").
or plus button
("
")
or plus button
25
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