Ce Label; Safety Devices - Vaillant flexoTHERM exclusive VWF 87/4 Operating Instructions Manual

4.5 CE label

The CE label shows that the products
comply with the basic requirements of the
applicable directives as stated on the iden-
tification plate.
The declaration of conformity can be
viewed at the manufacturer's site.

4.6 Safety devices

4.6.1 Frost protection function
The frost protection function for the system
is controlled via the system controller. If
the system controller fails, the heat pump
guarantees limited frost protection for the
heating circuit.
4.6.2 Protection against low heating
water pressure
This function continuously monitors the
pressure of the heating water in order to
prevent a possible loss of heating water.
4.6.3 Brine loss protection system
The brine loss protection system continu-
ously monitors the fluid pressure in the
environment circuit in order to prevent a
possible shortage of fluid.
4.6.4 Freeze protection
This function prevents the evaporator from
freezing when the heat source temperat-
ure drops below a certain value.
The outlet temperature of the heat source
is constantly measured. If the outlet tem-
perature of the heat source falls below a
certain value, the compressor temporarily
switches off and displays a status mes-
sage. If this fault occurs three times in a
row, it is switched off and a fault message
is displayed.
0020213396_02 flexoTHERM exclusive Operating instructions
Product description 4
4.6.5 Pump- and valve-blocking
protection system
This function prevents the pumps for heat-
ing water and brine and all diverter valves
from sticking. The pumps and the valves,
which were out of operation for 23 hours,
are switched on for 10 - 20 seconds, one
after the other.
4.6.6 High-pressure pressure switch
in the refrigeration circuit
The high-pressure pressure switch shuts
down the heat pump if the pressure in the
coolant circuit is too high. If the pressure
in the heat pump's refrigeration circuit ex-
ceeds the maximum pressure, the high-
pressure pressure switch temporarily shuts
down the heat pump. Following a waiting
period, another attempt is made to start
the heat pump. After three failed start at-
tempts in succession, a fault message is
displayed.
– Refrigeration circuit pressure max.: 4.60
MPa (g) (46.00 bar (g))
– Waiting period: 5 minutes (after the first
occurrence)
– Waiting period: 30 minutes
(after the second and every further oc-
currence)
The fault counter is reset if both of the
following conditions are met:
– Heat requirement without switching off
prematurely
– 60 minutes of uninterrupted operation
4.6.7 Hot gas thermostat in the
refrigeration circuit
The hot gas thermostat shuts down the
heat pump if the temperature in the refri-
geration circuit is too high. If the temperat-
ure in the heat pump's refrigeration circuit
exceeds the maximum temperature, the
hot gas thermostat temporarily shuts down
the heat pump. Following a waiting period,
another attempt is made to start the heat
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