8.2 Operating modes
Table 2. Shows the set operating mode of the heat pump.
Operating mode Meaning
(OFF)
The installation is fully switched off. This mode is also used to acknowledge certain alarms.
Caution!If the operating mode OFF or HOT WATER is to be used for long
periods during the winter, the water in the heating system in the heating
system must be drained, otherwise there is a risk of frost damage.
Alternatively the system solution with intermediate exchanger should be
used.
AUTO The heat pump regulates automatic compressor operation and auxiliary heater.
COMPRESSOR The control system is controlled so that only the heat pump unit (compressor) is allowed to
operate. In this operating mode peak heating charging (anti-legionella function) of the hot
water will not run because the auxiliary heater is not used.
AUX. HEATER The control system only permits the auxiliary heater to be in operation.
HOT WATER In this mode the heat pump only produces hot water, no heat goes to the heating system.
MANUAL TEST Operating mode MANUAL TEST is selected. Used to test different functions, for example circu-
lation pump.
8.3 Symbols
Table 3. Symbols shown in the display.
Symbol Meaning
COMPRESSOR Indicates that the compressor is in operation.
LIGHTNING Indicates that the auxiliary heater is in operation. The number indicates what additional
step is activated.
HOUSE Indicates that the heat pump produces heat for the heating system.
TAP Indicates that the heat pump produces heat for the water heater.
F FLOW SENSOR Indicates that the flow sensor is active (there is flow).
CLOCK Indicates that tariff control is active.
TANK Indicates the level of hot water in the water heater. When hot water is produced for the
water heater, this is indicated by a flashing icon for the tank. A lightning symbol by the
symbol indicates peak heating charging (anti-legionella function).
SQUARE Either indicates that the operating pressure switch has deployed, or that the pressure
pipe temperature has reached its maximum temperature.
DEFROST Displayed when defrosting is active.
FAN Displayed when the fan is active.
COOLING Displayed if cooling is produced.
A = Active cooling.
38 – Installation instructions VMGFD102
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