6
4 209 973 / 00
Oparation
Version
1. Program variants (Software)
De-icing method
2. Type of de-icing operation
• Gas = hot gas bypass
de-icing = Standard for type
VT-(157-E)
• Air = not relevant*
• Above 8°C = not relevant*
* Use forbidden!
3. Maximum operating temperature
(hot water)
4. Anode condition
Displays the condition of the
magnesium protection
Specialist level (Service menu)
Mode display
This function is intended for
separate ventilation of the
heat pump with the fan in
standby mode:
1 = Fan stage 1
(lower airflow)
2 = Fan stage 2
(higher air flow)
0 = No separate ventilation
function for the fan. Fan
only to be used when
heat pump operating!
9. Separate fan function
VenKon
1
10. Select fan stage
VenBetr
2
1 = Stage 1 = lower speed /
airflow
2 = Stage 2 = higher speed
/ airflow
11. Protective anode display
Anode
Auto
Status-display
Auto = signal anode present
(alarm when exchange need-
ed)
Manual = no signal anode.
Periodic checks: see page 6
12. Sensor temperature
Temp 1
-20°C
Status/Value display
• -20°C = no sensor connected
• Display of the actual tempera -
ture, if an additional sensor is
attached (e.g. boiler water or
outside temperature etc.).
Temperature range from -20°C
to 100°C.
Software
1.11
Sevicemenu
De-icing
Gas
T max
55°C
Setting the maximum value
Caution!
The set target temperature
value 55°C = maximum hot
water temperature that can
be set (set point). Range of
adjustment: 5°C-62°C
Anode
-20°C
Only an expert is al-
lowed to change the
settings!
• -20°C = anode is intact (OK.)
• Caution! The anode condition is
only displayed if a signal anode is
installed.
Functional Characteristics
of the controls on the WP-VT (2141)
Water heating mode
Depending on the settings, heating up
the water heater is carried out by the
pump, and/or electrical heating and/
or the boiler. The function of the water
heating operation is controlled by the
user program. heat pump: operational-
status W.Wasser. Temperature control:
by sensors ((Tmax=set point and Tmin).
The heat pump is switched on if the
temperature falls below the set value is
reached. If the heat pump is switched
off, the target temperature of the heat-
ing water is reached with the additional
heating selected (Hysteresis: WP +1/-
3K; additional heating system +/-1K).
The heat pump is switched off automati-
cally, if the temperature at the evapora-
tor unit falls below - 18°C. The operating
conditions are displayed in the control
panel. (See page 5: Display 3 )
De-icing mode
De-icing (by hot gas bypass) occurs
automatically as required. De-icing
with the de-icing value starts (fan off),
if the temperature at the evaporator
unit is <- 2°C. De-icing is terminated, if
the temperature of the de-icing sensor
reaches a value of + 5°C. If this value is
not reached within 20 minutes, de-icing
is stopped and the normal operation
is resumed. The de-icing interval is 2
hours.
Legionella protection
if in general little water is required (too
long a dwell time for the water in the
water heater), is it recommended that
the Legionella protection function be
activated. If the function is activated
(see user program) the water is peri-
odically heated to 65°C. First the water
is heated to 55°C by the heat pump
(time - max. 7 hrs), then together with
the additional heating (if switched on)
to 65°C. If the protection temperature
of 65°C is not reached within 12 hours,
an alarm is displayed. The Legionella
time sequence is 168 h (7 days), re-
peating itself periodically as long as
the function remains activated.
Important!
The status/mode setting and/or the
control‘s set values should not be
changed. In particular the settings
in the service menu (specialist level)
may not be changed.
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