STIEBEL ELTRON LWZ 404 SOL Installation Manual

32 | LWZ304-404 SOL www.stiebel-eltron.com
INSTALLATION
Settings
 VENTILATION
 FLOW RATE
 FAN STAGE VENT. AIR 1 Direct line: P37
 FAN STAGE VENT. AIR 2 Direct line: P38
 FAN STAGE VENT. AIR 3 Direct line: P39
 FAN STG. EXTRACT AIR 1 Direct line: P40
 FAN STG. EXTRACT AIR 2 Direct line: P41
 FAN STG. EXTRACT AIR 3 Direct line: P42
These parameters determine the air flow rates of the individual
fan stages. They should be set according to the design of the
ventilation system. The control unit maintains a constant flow
rate. The set value for "STAGE 0" is generally 0m³/h for both fans.
 PASSIVE COOLING
 PASSIVE COOLING
At high outside temperatures, temperatures in the house can rise
significantly above the set room temperature. With the "PASSIVE
COOLING" function (P75), the building can be supplied with cooler
outdoor air by bypassing the cross-countercurrent heat exchanger.
Passivkühlung
vorbereitet
Passivkühlung
aktiv
Mindestzeit T
A
> T
Rsoll
+ 3 °C
Maximalzeit Passivkühlung
8 h2 h
Außentemperatur T
A
Temperatur
Raumsolltemper
a-
tur + 3 °C
Raumsolltemper
a-
tur T
Rsoll
Raumsolltemper
a-
tur – 3 °C
1
2
3
Minimum time T
A
> T
Rset
+ 3°C
Passive cooling
2 hours
10:00 h
Outside temperature T
A
Passive cooling pre-
pared
Passive cooling
active
26_04_01_0108
1 Set room temperature + 3K
2 Set room temperature T
Rset
3 Set room temperature -3K
Passive cooling will be enabled if the outside temperature has, for
at least two hours, been 3K higher than the set room temperature
for heating circuit 1, as set with the "ROOM TEMPERATURE DAY"
parameter in the "HEATING" menu. If the outside temperature then
drops 3K below the set room temperature with a room tempera-
ture sensor connected, passive cooling is activated.
Option Function
OFF Activated passive cooling has no effect. The fans operate
as programmed. Windows stay shut.
EXTRACT AIR The supply air fan is stopped and the extract air fan out-
put is increased by 20% (e.g. from 47% to 67%). This
means cool outdoor air is drawn into the room through
the open windows. On hot days, this supports the cooling
with cool night air when a window is open. In this case,
open the windows in rooms supplied with air (living
room, nursery and bedrooms), for example using the
"WINDOW OPEN" control signal.
SUPPLY AIR The extract air fan is stopped, and the supply air fan out-
put is increased by 20%. In this case you do not have to
open the windows. However, this option is less effective
and does not work in very airtight houses, i.e. if in the
blower door test, the air change value n50is ≤1.
BYPASS With bypass module (option): Both fans continue to run
as programmed. The "WINDOW OPEN" control signal is
then used for the damper in the bypass module.
SUMMER CASSETTE With summer cassette (option): The fans will switch off
if the outside temperature is higher than the set room
temperature. If the outside temperature falls to 3K below
the room temperature, or 3K below the set room temper-
ature if there is no room temperature sensor, the fans are
switched on and will run according to the program. The
"WINDOW OPEN" control signal is enabled.
If an additional programming unit for heating circuit1 or a room
temperature sensor is connected in the living space, the actual
room temperature is taken into account instead of the set room
temperature.
Passive cooling ends no later than at 10:00h.
 PASS. COOL EXP. AIR
This function is currently not available and must remain disabled.
 AIR STOP SUMMER DHW
The appliance has a preheating coil for preheating the outdoor
air before it enters the cross-countercurrent heat exchanger. This
is not required in summer. You can use this parameter (options:
OFF| ON) to deactivate the appliance's ventilation function during
DHW heating.
 HUMIDITY PROTECTION
Options
 HUMIDITY PROTECTION OFF | ON
 HUM. THRESHOLD VALUE
 HUMIDITY HYSTERESIS
 HUM. MASKING TIME
 SET HUMIDITY MIN
 OUTPUT REDUCTION
 SET HUMIDITY MAX
 OUTPUT INCREASE
The appliance is equipped with humidity control that is intended
to protect your building against damage from humidity.
The humidity protection should always be switched on. The hu-
midity protection is only effective in fan stage 0. In its delivered
condition, humidity protection is disabled, i.e. the "HUMIDITY
PROTECTION" parameter is set to 0 ("OFF").
For drying buildings, the "HUMIDITY PROTECTION" parameter
must be set to 0 ("OFF"). When commissioning the appliance,
switch the parameter "HUMIDITY PROTECTION" to "ON
".

STIEBEL ELTRON LWZ 404 SOL Specifications

General

Brand	STIEBEL ELTRON
Model	LWZ 404 SOL
Category	Fan
Language	English