STIEBEL ELTRON LWZ 404 SOL Operation

OPERATION
Operation
ENGLISH
www.stiebel-eltron.com LWZ 304-404 SOL | 11
- HEAT M BOOST DHW TTL: Amount of heat that has been
transferred by the electric emergency/booster heater to the
DHW cylinder since the appliance was commissioned.
- HEAT M RECOVERY DAY: Amount of heat that was recovered
from the ventilation system on this day.
- HEAT M RECOVERY TTL: Amount of heat that has been re-
covered from the ventilation system since the appliance was
commissioned.
- HM SOLAR HTG DAY: Amount of heat that was transferred by
the solar thermal system to the heating circuit on this day.
- HM SOLAR HTG TOTAL: Amount of heat that has been trans-
ferred by the solar thermal system to the heating circuit since
the appliance was commissioned.
- HM SOLAR DHW DAY: Amount of heat that was transferred by
the solar thermal system to the DHW cylinder on this day.
- HM SOLAR DHW TOTAL: Amount of heat that has been trans-
ferred by the solar thermal system to the DHW cylinder since
the appliance was commissioned.
- HM COOLING TOTAL: Amount of heat absorbed by the appli-
ance via its evaporator from the rooms.
- PRESSURE HTG CIRC: This parameter indicates the pressure
inside the heating circuit.
- WATER FLOW RATE
4.7.10 Heating
This parameter enables you to set one heating curve each for
heating circuits 1 and 2. The room temperature will only remain
constant irrespective of the outside temperature if the correct
heating curve has been selected for the relevant type of building.
Selecting the correct heating curve is therefore vitally important.
The more precisely the heating curve is set, the more economically
the appliance works. Try therefore to optimise your heating curve.
Reduce the current heating curve until the flow temperature is
just sufficient for heating. The target is as flat a heating curve as
possible.
f Fully open thermostatic valves (remove head) in a lead room,
for example living room or bathroom.
f At different outside temperatures, adjust the heating curve so
the required temperature is set in the lead room (living room
or bathroom). Now the room temperature in these rooms is
controlled with the heating curve (see next diagram).
Standard values to begin with:
Parameter Underfloor
heating system
Radiator heat-
ing system
GRADIENT (P13) 0.4 0.8
LOW END (P14) 3 K 10 K
ROOM TEMPERATURE DAY
(P01)
20 °C 20 °C
1
3
2
4
5
Y
X
6
26�04�01�0297
7
1 Gradient influence
Gradient = Y/X
= Heating circuit temperature change/Outside temperature
change
2 Low end offset influence
3 Heating curve
4 Set room temperature influence
5 Low end
6 Outside temperature in °C
7 Set heating circuit temperatures in °C
HEATING CURVE gradient
The gradient [MENU/HEATING] determines the extent to which a
change in the outside temperature effects a rise in the flow tem-
perature. Typical problem: Increase the gradient if the room tem-
perature is too low at low outside temperatures (approx. -10°C).
Low end offset of the heating curve
By changing the parameter
LOW END, you effect a parallel offset
of the heating curve. Typical applications are explained in chapter
"Troubleshooting".
ROOM INFLUENCE
If you want to influence the heating curve through the room tem-
perature, install an auxiliary programming unit "FESComfort" in
your home. For parameter
ROOM INFLUENCE [MENU/HEATING/
HC1 or HC2], enter a value >0. The heating curve is then changed
by this value (room temperature deviation * room influence *
heating curve gradient).
FLOW PROPORTION
Flow means the pipework that supplies heating water to the heat-
ing system. The return carries the cooled water from the heating
system to the heating system. With parameter
FLOW PROPOR-
TION
[MENU/HEATING], you determine whether your heating sys-
tem should function as a flow or return temperature-controlled
system.
Flow proportion Effect
0 Heating system with return temperature control
100 Heating system with flow temperature control
50 Spread control (50% return and 50% flow control)
30 Spread control (70% return and 30% flow control)
80 Spread control (20% return and 80% flow control)
296066-38500-9030_LWZ_304-404_SOL_Bedienung_en.indb 11 21.07.2015 12:03:49

STIEBEL ELTRON LWZ 404 SOL Specifications

General

Brand	STIEBEL ELTRON
Model	LWZ 404 SOL
Category	Fan
Language	English