STIEBEL ELTRON LWZ 170 E plus - Parameter 20: Extract Air Fan Mode; Parameter 21: Selection, Switching Input 2; Parameter 22: Min Voltage, Switching Input 2; Parameter 23: Max Voltage, Switching Input 2

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INSTALLATION
Settings
Param-
eter
Description
Unit Factory setting
Setting range Step
size
Display text
and symbols
20 Extract air fan mode,
switching input 1
5
0 (Extract air fan off)
CN1
1 (Absolute minimum air flow rate 50 m
3
/h)
2 (Air flow rate stage 1)
3 (Air flow rate stage 2)
4 (Air flow rate stage 3)
5 (Step switch)
6 (Max. air flow rate)
7 (No extract air fan control)
21 Selection, switching input2 1 0 (N/O contact) V2
1 (0 - 10V input)
2 (N/C contact)
3 (Bypass open = 12V; bypass closed = 0V)
4 (Bypass open = 0V; bypass closed = 12V)
22 Minimum voltage, switching input2 V 0 0 - 10 0.5 V2 MIN
23 Maximum voltage, switching input2 V 10 0 - 10 0.5 V2 MAX
24 Conditions, switching input 2 0
0 (Aus) CN2
1 (Ein)
2 (On, if conditions for open bypass are met)
3 (Bypass control)
4 (Supply air diverter valve)
25 Supply air fan mode, switching
input2
5
0 (Supply air fan off)
CN2
1 (Absolute minimum air flow rate 50 m
3
/h)
2 (Air flow rate stage 1)
3 (Air flow rate stage 2)
4 (Air flow rate stage 3)
5 (Step switch)
6 (Max. air flow rate)
7 (No supply air fan control)
26
Extract air fan mode, switching
input 2
5
0 (Extract air fan off)
CN2
1 (Absolute minimum air flow rate 50 m
3
/h)
2 (Air flow rate stage 1)
3 (Air flow rate stage 2)
4 (Air flow rate stage 3)
5 (Step switch)
6 (Max. air flow rate)
7 (No extract air fan control)
27 Geothermal heat exchanger OFF
OFF (Valve control for geothermal heat exchanger off) EWT
ON (= Valve control for geothermal heat exchanger on)
28 Minimum temperature for geother-
mal heat exchanger (below this tem-
perature, the valve opens)
°C 5 0 - 10 0.5
EWT T-
29 Maximum temperature for geother-
mal heat exchanger (above this tem-
perature, the valve opens)
°C 25 15 - 40 0.5
EWT T+