STIEBEL ELTRON WPM 3

OPERATION
Menu structure
26 | WPM 3 www.stiebel-eltron.com
WPM3 settings for the WPF
- Under SETTINGS/COOLING, set cooling to ON.
- Set WPF cooling to ON .
- Set COOLING MODE/PASSIVECOOLING or COOLING MODE/
ACTIVECOOLING to ON (the active mode is only available if
a corresponding provision has been made on site; in active
mode, the system cools first in passive mode for as long as
possible. The heat pump only changes over to active mode
when passive cooling becomes inadequate.)
- With the FE7: Set FAN COOLING to ON.
With the FEK: Set AREA COOLING or FAN COOLING to ON.
- With the FEK and FE7: Set AREA COOLING and/or FAN COOL-
ING to ON.
- Cooling mode with FE7 and FEK is enabled with the standard
settings.
WPM3 settings for the WPL
- Under SETTINGS/COOLING, set cooling to ON.
- Set WPL cooling to ON.
- With the FE7: Set FAN COOLING to ON.
- With the FEK: Set AREA COOLING or FAN COOLING to ON.
- With the FEK and FE7: Set AREA COOLING and/or FAN COOL-
ING to ON.
- For cascades: Under STANDARD SETTING cooling stages, se-
lect how many of the cascade control heat pumps should be
used for cooling. You can select 1-n heat pumps.
- Cooling mode with FE7 and FEK is enabled with the standard
settings.
Standard settings
Control unit setting parameters for cooling:
Standard set-
ting
Setting range
Set room temperature 25 °C 20 °C - 30 °C
Flow temperature 15 °C 7 °C – 25 °C
Flow temperature hysteresis 2 K +1 K – +10 K
DYNAMICS
The DYNAMICS parameter allows you to choose how quickly the
source pumps or the compressor are started in the case of cooling.
Dynamic passive cooling
(only for cascade control)
Dynamic 1: After the cooling output has been switched on, first
source pumps 1-n and then buffer charging pumps 1-n start, each
with a delay of one minute.
Dynamic 10: After the cooling output has been switched on, first
source pumps 1-n and then buffer charging pumps 1-n start, each
with a delay of five minutes. Interpolation is used between the
values 1 and 10.
Dynamic active cooling
Dynamic 0: Compressor starts simultaneously with the source pump.
The value for dynamic 0 can only be selected for active cooling
with the WPF.
Dynamic 1: Compressor starts as soon as the source pump has
been running for 10 minutes and the current flow temperature is
greater than or equal to the selected set flow temperature plus
hysteresis plus 0.5 K (dynamic hysteresis for value 1).
Dynamic 10: Compressor starts once the source pump has been
running for 30 minutes and the current flow temperature is greater
than or equal to the selected set flow temperature plus hysteresis
plus 2 K (dynamic hysteresis for value 10). Interpolation is used
between the values 0 and 10.
Control characteristics for passive cooling (WPF/ WPC)
Cooling mode is started if the actual room temperature is higher
than the set room temperature. The heating circuit pump is con-
trolled. The “cooling” controller output is activated. Additional
zone valves or diverter valves can be switched with the “cooling”
controller output, for example. If the actual flow temperature is
lower than the set flow temperature after 60seconds, “buffer
charging pump1” and “source pump 1” are activated for brine/
water heat pumps.
In a cascade, the additional source and buffer charging pumps
start. Whether these additional pumps are activated depends on
the “dynamic cooling” settings.
Controller characteristics for active cooling WPF
Stage 1: (Passive stage)
Cooling mode is initiated when the actual room temperature is
higher than the selected set room temperature. The heating cir-
cuit pump and the controller cooling output are switched on. For
the first 60 seconds, only the heating circuit pump operates. The
source pump and buffer charging pump 1 start when the actual
flow temperature is lower than the set flow temperature. In a
cascade, the source and buffer charging pumps 2-n starts subject
to the passive cooling dynamics.
Stage 2: (Active stage)
The compressor starts when the flow temperature cannot be re-
duced further by passive cooling alone. In a cascade, the first com-
pressor starts and, simultaneously, the source and buffer charging
pumps 2-n switch off. The source pump and buffer charging pump
of the first heat pump remain switched on. Subject to the active
cooling dynamics, the compressors 2-n and the source and buffer
charging pumps 2-n also start if the required flow temperature
cannot be achieved with the first compressor alone.
Independent of the flow temperature, the source pump must run
for at least 5 minutes. This ensures that at least once, only cool
water enters the cooling system to achieve any cooling effect.
At a flow temperature < 15 °C, the source pump switches off in
accordance with the standard settings.
If DHW heating is demanded during this minimum runtime of 5
minutes, cooling mode immediately switches over to DHW heating.