INSTALLATION
Commissioning
36 | WPF basic www.stiebel-eltron.com
Setting 2: Moderate adjustment of the outside temperature (av-
eraging over a 48 h period), e.g. solid construction with thermal
insulation and average heat transfer.
Setting 3: Severe adjustment (averaging over a 72 h period) of the
outside temperature, e.g. house with slow heat transfer.
9 PUMP CYCLES
Heating circuit pump control
The PUMP CYCLES parameter only applies to the direct heating
circuit 1, i.e. for heating circuit pump 1.
This parameter can be set ON or OFF . In setting OFF the heating
circuit pump will not cycle. Instead, it will operate constantly and
is only switched off in summer mode.
The heating circuit pump start will be controlled in accordance
with a fixed temperature curve of the outside temperature, as soon
as this parameter is set to ON.
The heating circuit pump start pulse is always five minutes.
The heating circuit pump for heating circuit 1 always starts with
each heat pump start. The pump runs on for 5 minutes after the
heat pump has been switched OFF. Now the start-up duration is
brought to bear, e.g. at an outside temperature of 5 °C, the pump
starts three times per hour for five minutes respectively.
Pump kick
To prevent the pumps seizing up, over the summer for example,
when a pump has been switched off for 24 hours it will be switched
back on for 10 seconds. This applies to all pumps.
Heating circuit pump control with connected FE7/FEK remote
control
In conjunction with the FE7 or FEK remote control, the respec-
tive heating circuit pump is switched off and the mixer moves to
“Closed” in accordance with the switching condition
ϕ
ACTUAL room
>ϕ
SET room
+ 1 K
the respective heating circuit pump is switched OFF and the mixer
moves to “CLOSE”. This only applies if the room sensor influence is
set to K > 0. Reverse control is subject to the following condition:
ϕ
ACTUAL room
>ϕ
SET room
The summer mode also becomes effective for the respective heat-
ing circuit when operating with a FE7 or FEK remote control.
0 10 20 30 40 50 60
< -10
-10
-5
0
5
10
Y
2
1
84�03�01�0039
Y Outside temperature in °C
X Time in minutes
1 Pause
2 Pump run time
10 BU PUMP CONST
When using a buffer cylinder, set this parameter to OFF.
11 FIXED VALUE
Fixed value temperature
The heat pump return is controlled at the set fixed value. The
switching time program will then be ignored. The various program
switch positions will then only affect the mixer circuit (if installed).
The frost protection is activated and the compressor is switched
OFF when the program selector is set to “Standby” and a fixed
temperature has been selected. Summer logic remains disabled
with fixed temperature control. This means that the heating circuit
pump is not switched off for the direct heating circuit. With the
flap closed, the display shows the fixed temperature program, in
other words always showing the heating times.
12 SOURCE
Frost protection for brine|water heat pumps
The heat pump can only be operated as ground source heat pump.
Ethylene glycol as brine (including polypropylene glycol) means
that the heat pump frost protection is inactive. Responses by the
frost stat no longer have any influence.
Potassium carbonate as brine (STIEBEL ELTRON heat trans-
fer medium) means that the heat pump frost protection is in-
active. This ensures that the source pump is started at an
outside temperature of -10°C, even if the heat pump is idle.
It is switched OFF again at an outside temperature of – 8 °C.
ALM 0, 30, 60, 120 and 180
(Only in conjunction with the extractor module LWM 250)
At a brine inlet temperature of < 10 °C, a regeneration of the heat
source system can be implemented in conjunction with the ex-
tractor module and ethylene glycol or propylene glycol as brine.
Settings enable the determination of the run-on time of
the brine pump, after the heat pump has been shut down.
The values stated correspond to the run-on time in minutes at an
average brine inlet temperature of 0 °C.
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