Maintenance
Vent 402 – 6721815546 (2021/03)
22
Fig. 26 Heat pump quick overview
8.2 Shutdown / switching off
The unit is normally switched on. The system should only be shutdown
for maintenance work, for example.
Standby means that the system is completely turned off and no security
functions such as frost protection is active.
To temporarily switch off the system:
– Select Yes in the menu Settings > Standby mode
To switch on the system:
– Tap on the display.
– Select Yes.
To permanently shutdown: Disconnect power from the entire system
and all BUS nodes.
After a prolonged power failure or extended period of idleness, the date
and time may need to be reset. All other settings are retained
permanently.
8.3 Menu: Quick compressor start
Select Yes to perform a quick restart of the compressor. In case of power
failure or compressor stop, restart is delayed by 9 minutes (pressure
equalization time).
8.4 Menu: function check
This menu can be used to test active heating system components
individually. If the option Activate function tests is set to Yes in this
menu, the normal heating operation is interrupted in the entire system.
All settings are saved. The settings in this menu are only temporary and
return to the saved settings as soon as possible Activate function tests
set to No or the menu Function tests closed. The available functions and
the possible settings vary depending on the system installed.
A function test is performed by setting the parameters for the listed
components. You can check whether the compressor, mixing valve,
circulation pump or 3-way-valve responds appropriately by inspecting
the behaviour of the corresponding component.
Table 15 Function test
8.5 Menu: Input signals info
Heating system temperatures and other inputs are displayed in this
menu. For instance the flow temperature or the current DHW
temperature are displayed here.
Current status of the external inputs are also displayed.
8.6 Menu: Output signals info
Current outputs from the controller are displayed in this menu. For
instance the actual and demanded speed of the compressor, valve
positions and status of the auxiliary heater.
8.7 Menu: Timer overview
Current status for the different delay timers are displayed in this menu.
For instance the actual time delay until compressor start, auxiliary
heater delay and heating / summer mode switch-over delays.
8.8 Menu: Faults
Current alarms and alarm history are displayed in this menu.
Table 16 Alarm menu
Menu item Description
Venting function This function is used to vent air out of the heat pump
by activating the immersion heater, the 3-way valve
and the pump in a sequence that facilitates venting.
Compressor The compressor is started or stopped.
0010023280-001
PC0 prim heating
pump
The heat transfer pump is started or stopped.
PC0 speed By adjusting the percentage, the speed of the
circulation pump changes. 100% = maximum
speed.
PC1 htg circ
pump HC1
The circulation pump for heating circuit 1 is started
or stopped.
HC2 pump The circulation pump for heating circuit 2 is started
or stopped.
Mixer HC2 The mixer of the heating circuit 2 can be stopped in
its current position, opened or closed.
VW1 HW 3-way
valve
If [Off] the 3-way valve is set to heat, select [On] to
set it to domestic hot water.
Auxiliary heater
step 1
Select [On] to activate the first step of the electric
heater.
Auxiliary heater
step 2
Select [On] to activate the second step of the
electric heater.
PL3 fan Select [On] to activate the fan.
Hot water
circulation pump
The pump for domestic hot water is started or
stopped if it was installed.
Menu item Description
Active system
faults
All current alarms in the system are shown here.
System faults
history
The latest alarms for the whole system are shown
here in chronological order. The alarm history can be
deleted in the recovery menu ( Chapter, 8.10).
Heat pump faults
history
The latest alarms for the heat pump are shown here
in chronological order. For each alarm stored, a
snapshot is available with current data at the time
the alarm occurred. Press [Details] to display the
snapshot. The alarm history can be deleted in the
recovery menu ( Chapter, 8.10).
Menu item Description
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