Ce Marking; Fluorinated Greenhouse Gases; Safety Devices; Operation - Vaillant VWL 57/5 IS Operating, Installation And Maintenance Instructions

4 Operation

3.8

CE marking

The CE marking shows that the products comply with the
basic requirements of the applicable directives as stated on
the data plate.
The declaration of conformity can be viewed at the manufac-
turer's site.
3.9

Fluorinated greenhouse gases

The product contains fluorinated greenhouse gases in a her-
metically sealed device. As specified in the technical spe-
cifications from the manufacturer, the tested leak rate for the
electrical switchgear is less than 0.1% per year.
3.10

Safety devices

3.10.1 Frost protection function
The frost protection function for the system is controlled us-
ing the product itself or using the optional system control. If
the system control fails, the product guarantees limited frost
protection for the heating circuit.
3.10.2 Low-water pressure protection
This function continuously monitors the pressure of the heat-
ing water in order to prevent a possible loss of heating water.
3.10.3 Freeze protection
This function prevents the outdoor unit's evaporator from
freezing when the heat source temperature drops below a
certain value.
The outlet temperature of the heat source is constantly
measured. If the outlet temperature of the heat source falls
below a certain value, the compressor temporarily switches
off and displays a status message. If this fault occurs three
times in a row, it is switched off and a fault message is
displayed.
3.10.4 Pump blocking protection
This function prevents the pumps for heating water from
sticking. The pumps, which were out of operation for
23 hours, are switched on for 10–20 seconds, one after the
other.
3.10.5 Hot gas thermostat in the refrigerant circuit
The hot gas thermostat shuts down the heat pump if the tem-
perature in the refrigerant circuit is too high. Following a wait-
ing period, the heat pump attempts to start once more. After
three failed start attempts in succession, a fault message is
displayed.
– Max. refrigerant circuit temperature: 135 ℃
–
Waiting period: 5 minutes (after the first occurrence)
–
Waiting period: 30 minutes
(after the second and every further occurrence)
The fault counter is reset if both of the following conditions
are met:
–
Heat requirement without switching off prematurely
6
–
60 minutes of uninterrupted operation
3.10.6 Safety cut-out (SCO) in the heating circuit
If the temperature in the heating circuit of the internal elec-
tric back-up heater exceeds the maximum temperature, the
safety cut-out shuts down the electric back-up heater as a
securing measure. After it is triggered, the safety cut-out
must be replaced.
– Max. heating circuit temperature: 95 ℃
4 Operation
4.1

Basic display

120
The displays shows the basic display with the current status
of the product. The daily energy yield (1) is displayed in the
centre of the display.
If you press a selection button, the activated function is dis-
played in the display.
As soon as a fault message is present, the basic displays
switches to the fault message.
4.2

Operating concept

The product has two operating levels.
The operating level for the end user shows the most import-
ant information and offers setting options which do not re-
quire any special prior knowledge.
The operating level for the competent person is reserved for
the competent person and is protected by a code.
You can find further information in the operating instructions
for the indoor unit.
4.3

Menu display

4
Xxxx
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Xxxx Xxxxxxx
3
Xxxxxxxxxx
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2
1 Scroll bar
2 Current assignment of
the selection buttons
Operating instructions Hydraulic station 0020257319_02
1
kWh/d
E
1
Xxxxxxx
3 Selection level list
entries
4 Selection level