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Settings (qualified contractors)
¨¨¨n Outdoor air routing automatic: Bypass mode with
summer day detection
For bypass mode to be enabled, one of the following conditions
must be met for 60 minutes:
– Set room temperature + Temp. differential for heat recovery
bypass < Outdoor air temp.
– Set room temperature - Temp. differential for heat recovery
bypass > Outdoor air temp.
If all the following conditions are met, the appliance switches to
bypass mode.
– Extract air temp. - Hysteresis for heat recovery bypass >
Outdoor air temp.
– Extract air temp. > Set room temperature
If one of the following conditions is met, the appliance termin-
ates bypass mode.
– Outdoor air temp. < Temperature to block heat recovery by-
pass
– Extract air temp. - Hysteresis for heat recovery bypass <
Outdoor air temp.
– Extract air temp. < Set room temperature
¨¨n Temperature to enable heat recovery bypass
To enable checking of the other parameters for bypass mode,
the outdoor air temperature must be no less than the value set
in this parameter.
¨¨n Temperature to block heat recovery bypass
If the outdoor air temperature falls below this blocking temper-
ature, bypass mode is disabled.
¨¨n Hysteresis for heat recovery bypass
To make cooling possible, the outdoor air temperature must be
cooler than the extract air temperature by the value set in this
parameter.
¨¨n Temp. differential for heat recovery bypass
Use this parameter to define the temperature differential that
must be exceeded for bypass mode to be enabled.
For bypass mode to be enabled, one of the following conditions
must be met for 60 minutes:
If heat recovery bypass mode = Automatic outdoor air routing:
– Set room temperature + Temp. differential for heat recovery
bypass < Outdoor air temp.
– Set room temperature - Temp. differential for heat recovery
bypass > Outdoor air temp.
¨¨n Cooling/heating, heat recovery bypass
u Set the purpose for which the bypass should be used.
Option
Effect
Cooling/heating
Depending on the temperature, use the
outdoor air for cooling or heating.
Cooling
Summertime: use cool outdoor air.
Heating
Spring/autumn: use warm outdoor air.
¨n Frost prot.
¨¨n Frost protection temp.
The frost protection temperature shows you the switching
threshold at which additional heating levels are switched on.
¨¨n Temp. to enable frost protection
The unit only activates frost protection if the outdoor air temper-
ature drops to the value that can be set in this parameter.
56
| LWZ-W 450/600 Premium
¨¨n Enable preheating
Option
Effect
Off
The internal preheater is completely deactivated.
On
The internal preheater is activated. To keep the cross-
countercurrent heat exchanger free from ice, pre-
heating ensures a minimum supply air temperature
with reference to the temperature that is set in the
"Frost protection temp." parameter.
¨¨n Frost protection mode
Option
Effect
Outdoor
At this setting, the appliance operates solely in frost
air reg.
protection mode. The preheating coil control only
measures the outside temperature.
Supply
At this setting, the appliance operates in comfort
air reg.
mode. In addition to the outside temperature, the
supply air temperature is also measured.
Passive
The preheating coil is controlled to ensure that the
house
supply air temperature does not fall below the 16.5 °C
reg.
specified in the passive house criteria.
Eco
To save energy, the flow rate of the appliance is re-
duced when the preheating coil is enabled.
¨¨n Frost protection stages
If the cross-countercurrent heat exchanger freezes up, you can
combat this by increasing the frost protection level.
¨¨n Frost protection volume reduction
The menu item is relevant only for troubleshooting purposes.
With this function you can select how the appliance should en-
sure frost protection at the output limit of the preheating coil or
without the preheating coil. The appliance is pre-configured
such that the ideal operating mode is preset.
Option
Effect
0
Off
1
No function
2
Symmetrical flow rate reduction for appliances with
preheating coil
3
No function
4
Asymmetrical flow rate reduction for appliances
without preheating coil
5
Symmetrical flow rate reduction for appliances
without preheating coil
¨n Ventilation unit
¨¨n Device type
Right-hand version
Left-hand version
¨¨n 0-10 V input
Option
Meaning
0
Off
1
Ventilation operating mode
– 0 V: fan setting 0
– 2.5 V: fan setting 1
– 5 V: fan setting 2
– 7.5 V: fan setting 3
– 10 V: time program mode
If the 0–10 V input is enabled for this operating mode,
the appliance cannot be controlled via the I²C bus
(e.g. programming unit).
2
Operating mode heat recovery bypass
– 0 V: bypass closed
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