Function and operation
Vent 402 – 6721815546 (2021/03)
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this connection is complete and the system is started, the heat pump
must be set for the exclusive DHW mode.
Select Yes during Service > Commissioning.
Check in the same menu that the heating system is set to Radiators.
With this setting, the heat pump operates continuously in summer mode,
wich means that only DHW production is enabled.
7.7 Service menu
Service menu overview Chapter 13.
If the standard display is active, scroll to the right and select Service.
Enter the access code as described in the commissioning chapter
6.2.2.
Tap on the heading to open the selected menu item, activate the input
field for a setting or confirm a setting.
Press the d button to exit the current menu item.
In some menus, select either Confirm or Cancel when a setting is
changed.
When all settings are done, tap on Store installer settings before
exiting the Service menu. This will save all settings done during
commissioning, even settings on customer level.
The default settings are highlighted. With a number of settings, the
default setting depends on which heat source is connected.
7.7.1 Heat source settings
Menu: Heat pump
Make the specific heat pump settings in this menu. These settings are
only available if the system is designed and configured accordingly and
the type of unit used supports this setting.
Table 10 Heat pump settings
Menu: Auxiliary heater
Make settings for the booster heater in this menu. These settings are only
available if the system is designed and configured accordingly and the
type of unit used supports this setting.
Menu options Description
Flow detection Select [Yes] to activate the built-in flow control.
Then the system will automatically adjust the heat
pump's output to the number of open radiators.
If [No] is set, then at least 70% of the heating system
must be kept open for proper function of the heat
pump.
If the flow rate is too low, the compressor and the
booster heater will not run. The heat pump restarts
when the flow is sufficient and there is a heating
demand.
PC0 speed Select [Automatic], the control unit then
continuously adjusts the speed according to the
set difference for the heat transfer medium.
-or-
Set a constant speed for the heat transfer pump
PC0. This should only be done in special cases.
PC0 temperature
diff. htg.
Set the desired temperature difference (delta) for
the heat transfer medium.
PL3 fan speed Set the fan speed to get the correct air current.
Manual
defrosting
Select [Yes] to activate defrosting. When the
evaporator was defrosted, the function shuts off
automatically.
Fuse Select the fuse size assigned for the heat pump
1)
.
Start anti-seize Select the time for pump anti-seize.
HC1 priority Yes: Heating circuit 1 has priority and all additional
heating circuits are restricted by the requirements
of heating circuit 1. Any additional heating circuit
will only be heated if heating circuit 1 is heated. The
maximum flow temperature of all heating circuits is
limited to the flow temperature of heating circuit 1.
[No]: If any additional heating circuit is heated,
heating circuit 1 without mixer is also heated.
Heating circuit 1 will have the same flow
temperature as the highest flow temperature for the
additional heating circuits.
1) This menu appears only if an output limiter is installed.
Menu item Description
Electrical mode Red. 1 kW: The power of the electric heater is
limited to 1 kW.
Red. 2 kW: The power of the electric heater is
limited to 2 kW.
Red. 3 kW: The power of the electric heater is
limited to 3 kW.
Red. 6 kW: The power of the electric heater is
limited to 6 kW.
The electric heater is operated in 3 steps up to
maximum power.
Limiter with
compressor
0...maximum performance of installed electric
heater.
During compressor operation the electric additional
heater output is limited to the set value.
Limit aux heater
output
0...maximum performance of installed electric
heater.
During electric additional heater operation without
compressor, the output is limited to the set value.
Limit HW mode
output
0...maximum performance of installed electric
heater.
During DHW mode the electric additional heater
output is limited to the set value. The setting cannot
be greater than the value set in Limit aux heater
output.
Stand-alone
mode
Select [Yes] to activate. This setting is used if the
heat pump is to run without a cooling module. All
heat and hot water production only takes place with
the booster heater.
Auxiliary heater
only
Select [Yes] to activate. This setting blocks the heat
pump (compressor) so that all heat and hot water
production only takes place with the booster heater.
Menu options Description
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