EN
GL
ISH
www.stiebel-eltron.com
LWZ 304 Trend | LWZ 404 Trend | LWZ 304 Integral |
33
INSTALLATION
Settings
REFRIGERATION UNIT
COMPRESSOR CYCLING
Here, you define the delay before the compressor switches back
on. To limit the compressor to three start cycles per hour, a value of
20 minutes is preset. This time counts from when the compressor
starts. For example, the compressor can run for 15 minutes, and
start again after 5 minutes downtime.
EXPELLED AIR SPEED
This parameter enables you to set the speed of the exhaust air fans
as a percentage of the maximum speed. The exhaust air fan should
always be set to 70 % to ensure efficient heat pump operation.
PUMPS
PUMP SPEED DHW
This parameter enables you to set the speed of the internal circu-
lation pump during DHW heating.
PUMP SPEED HEATING
This parameter enables you to set the speed of the internal circu-
lation pump during room heating.
MIXER P. RUN-ON
This parameter enables you to set the pump run-on for the mixer
pump after the internal circulation pump is switched off. This
assists in draining any buffer cylinder that may be present.
PUMP CYCLES
MINIMUM CYCLES
MAXIMUM CYCLES
OUTSIDE TEMP MIN CYC
OUTSIDE TEMP MAX CYC
Determine here how many times each day the heating circuit pump
starts. Under "OUTSIDE TEMP MIN CYC", you define the outside
temperature above which the pump starts as often as is set under
"MINIMUM CYCLES". Accordingly, "OUTSIDE TEMP MAX CYC" de-
termines the temperature below which the pump starts as often
as set under "MAXIMUM CYCLES".
Example: In factory settings, if the outside temperature is above
20 °C ("OUTSIDE TEMP MIN CYC") the pump runs once a day ("MIN-
IMUM CYCLES"); below 19 °C ("OUTSIDE TEMP MAX CYC") 288 times
a day for five minutes at a time (288*5/60=24 hours). This means
that below 19 °C, the pump is constantly on; above 20 °C, the pump
starts once a day so it does not seize up during the summer. The
appliance interpolates between the temperatures "OUTSIDE TEMP
MIN CYC" and "OUTSIDE TEMP MAX CYC". At 19.5 °C the circulation
pump starts 144 times each day.
With the aid of "PUMP CYCLES", you can set the pump not to start
during the compressor blocking time (20 min) in winter. For this
purpose, set "MAXIMUM CYCLES" (P55) to 50 and "OUTSIDE TEMP
MAX CYC" (P56) to 0 °C. Below 0 °C, the pump therefore starts no
more than 50 times a day. This prevents the electric emergency/
booster heater being started while the compressor is blocked,
although the compressor output should still be sufficient.
Note
In summer mode and in exclusive DHW mode, the "OUT-
SIDE TEMP MIN CYC" parameter will not be taken into
account. The circulation pump runs as often as set in the
"MINIMUM CYCLES" parameter. If the outside temperature
falls below 4 °C, the circulation pump runs in DHW mode
as often as set in the "MAXIMUM CYCLES" parameter.
In manual mode, the circulation pump runs as often as
set in parameter "MAXIMUM CYCLES" (P55).
EMERGENCY MODE AUTO
When this parameter is activated, emergency mode will be acti-
vated if the compressor is disabled as a result of a fault.
POWER-OFF
With the "POWER-OFF" parameter the effect of the power input
on the blocking of individual heat sources can be selected. If this
parameter is not set correctly and the power supply utility cuts
the power supply, fault messages may result.
Option Function
0
No blocking
1
The heat pump is blocked. The electric emergency/booster heater
is blocked above the dual mode point for heating. After restarting,
the electric emergency/booster heater remains blocked for a cer-
tain time. For this purpose, a restart time is set in the "Compressor
cycling" parameter. The electric emergency/booster heater for DHW
heating is started after the saved delay time stored in the "Booster
timeout" parameter has expired.
2
The heat pump is blocked. The electric emergency/booster heater
is enabled for DHW heating after a delay time of 10 minutes has
elapsed. The electric emergency/booster heater is blocked above
the dual mode point for heating.
3
The heat pump is blocked. The electric emergency/booster heater is
enabled for DHW heating and heating after a delay time of 10 min-
utes has elapsed.
4
The electric emergency/booster heater is blocked.
5
Electric emergency/booster heater and heat pump are blocked.
PROCESS VALUES
These values are used for analysis in the event of a fault.
FAN (PRC)
OUTSIDE TEMPERATURE
EVAP. OUTLET TEMP.
HOT GAS TEMPERATURE
FLOW TEMPERATURE
CONDENSER TEMP.
RETURN TEMPERATURE
COOLING TEMP.
HIGH PRESSURE
LOW PRESSURE
LP FILTERED
POSITION VALVE
