Metro Therm METROAIR AQUA HPM, Руководство пользователя

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7.7.1 Water heating
When tapping hot water, cold water is supplied to bottom of the water tank. A sensor measures
the temperature in the water tank. When the temperature has dropped 5°C below the set
temperature, the compressor starts and the fan ventilates air through the evaporator. When the
water is heated to the set temperature, the compressor (and fan) stops again.
7.7.2 Fan operation
The fan can continue to run, even when the compressor has stopped. Select mode 2 or mode 3.
These functions are used when a domestic hot water heat pump also is used for extracting air
from wet rooms in the residence.
As long as input to T10 (External start/stop) is short circuited, the control is forced to run mode
3. This can be used to ensure additional extraction from e.g. the bathroom while taking a show-
er. When the input to T10 is no longer short circuited, the controller will go back to the mode
prior to short circuiting.
7.7.3 Defrosting
When ice formation occurs on the evaporator, the temperature difference between the tempera-
ture before the evaporator and the temperature in the evaporator is too high and the system will
begin the defrost cycle (see table for defrosting). The solenoid valve (MA4) opens and the fan
stops, until the ice has melted and the evaporator has reached a temperature of approximately
10 °C (subject to the set point in menu point P4). Then the solenoid valve closes again and the
fan starts.