STIEBEL ELTRON LWZ 180 Bedienung Und Installation Seite 45

INsTALLATIoN
settings
„P5: Fan operating mode
Use this parameter to switch between flow rate control and con-
stant pressure control.
Effect
0 The appliance maintains a constant flow rate for both fans. The appliance
operates with set flow rates P6 to P9.
1 The appliance maintains a constant pressure at the extract air fan. The
appliance regulates the pressure at the extract air connector to the set
values saved in P10 to P13. The flow rate that is established there is used
as the set value for flow rate control of the supply air fan. The supply air
flow rate offset set in parameter P14 is also taken into account.
„P14 : Supply air flow rate offset
Use this parameter to adjust the supply air flow rate during com-
missioning. The offset refers to standard ventilation and is con-
verted internally as a percentage for the other fan stages.
Example
- Nominal flow rate (stage 2): 180 m³/h
- Offset : 45 m³/h
stage set off- set flow rate
flow set + o ffset
rate
0 50
1 130
2 180 45 180+45 = 225
3 235
„P15 : Humidity protection interval
If you set fan stage 0, the appliance switches to a 24 hour dormant
phase. The humidity protection control unit only starts after this.
The appliance measures the humidity of the extract air for the time
set in P16. The appliance compares the last measured value with
the limit value set in P17. If the limit value is exceeded, the appli-
ance starts to ventilate. If the limit is undershot again, the appli-
ance terminates ventilation. At this point, the humidity protection
interval restarts, at the end of which the moisture is measured.
„P16 : Start-up time for humidity measurement
The appliance measures the humidity of the extract air for the time
set in P16. The appliance compares the last measured value with
the limit value set in P17.
„P22 : Enable preheater
Effect
0 The internal preheater is completely deactivated.
1 The internal preheater is activated. In order to keep the heat exchanger
free from ice, the preheater ensures a minimum supply air temperature
with reference to the frost protection temperature adjustable in param-
eter P18.
While this parameter is being displayed or adjusted, the "frost
protection" symbol is shown on the display.
www.stiebel-eltron.com
offset fac- Internal set flow
tor rate = s et flow rate *
o ffset factor
50*1.25 = 62
130*1.25 = 162
225/180 = 1.25 180*1.25 = 225
235*1.25 = 294
LWZ 180 / L WZ 280 / LWZ 180 Enthalpie / LWZ 280 Enthalpie |
„P23 : Frost protection mode
Effect
0 At this setting, the appliance operates solely in frost protection mode. The
preheating coil control only measures the outside temperature.
2 At this setting, the appliance operates in comfort mode. In addition to the
outside temperature, the supply air temperature is also measured. The
preheating coil is controlled to ensure that the supply air temperature
does not fall below the 16.5 °C specified in the passive house criteria.
„P24 : Bypass enable temperature
To enable checking of the other parameters for the bypass, the
outdoor air temperature must be no less than the value set in
this parameter.
„P25 : Bypass blocking temperature
If the outdoor air temperature falls below this blocking tempera-
ture, the bypass is deactivated.
„P26 : Bypass hysteresis
To make cooling possible, the outdoor air temperature must be
lower than the extract air temperature by the value set in this
parameter.
„P27 : Temperature differential for enabling the
bypass
Use this parameter to define the temperature differential that must
be exceeded for the bypass to be enabled. For the bypass to be
activated, the following condition must apply for 60 minutes:
P3 = 2 : Outdoor air temperature > Set room temperature + P27
P3 = 3 : Extract air temperature > Set room temperature + P27
„P29 : Appliance type
This parameter is set at the factory. The parameter can only be set
after the controller assembly has been replaced.
„P30 : Temperature for enabling frost protection
The unit only activates frost protection heating if the outdoor air
temperature drops to the value that can be set in this parameter.
„P31 : Enabling of humidity-dependent flow rate
control
With humidity-dependent flow rate control, the air flow rate is
increased or decreased depending on the humidity level.
Effect
0 Disabled
1 enabled
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