Metro Therm METROAIR AQUA HPM, Руководство пользователя

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Disconnect the power to
the unit before carrying out any
repairs on the unit.
Repair of the unit and reactivation
of safety breakers should only be
carried out by authorized person-
nel.
7.7.6 Timer function
The timer function includes a 24 hours clock plus week days (1-7). Two different low tariff
periods can be defined, working days and weekends. Also, the day and time for anti-legionella
control can be set.
7.8 Safety features
7.8.1 High pressure switch
In order to ensure that the compressor does not run beyond its operating envelope there is a
built-in high pressure switch which shuts down the compressor when the pressure in the cooling
circuit becomes too high. The pressure switch shuts down the compressor if the pressure gets
higher than 2.0 MPa (20 bar) and reengage the compressor when pressure has lowered to 1.6
MPa (16 bar).
7.8.2 Safety breakers
The compressor is also equipped with a thermal circuit protector, ensuring that the compressor
stops if the temperature gets too high. For an example if the compressor does not revolve when
powered, due to blockage or due to lack of pressure equilisation before start-up. If the breaker
cuts out the compressor, leave the unit to cool down before restarting. Upon repeat, call for
service personnel.
If an auxilary electrical heater is installed in the water tank this should be equipped with at least
one high temperature safety breaker. It is recommended to use a safety breaker which will disen-
gage at 80°C.
7.9 Alarms
7.9.1 PE: High pressure switch alarm
When the high pressure switch cuts off, the error text ”PE” will show in the display. When the
cause of the error is found the power must be switched off for 10 seconds and then turned on
again to reactivate the pressure switch. The “PE” error disappears from the display.
Lower the water temperature set point 2-3°C if necessary to avoid the recurrence of the pres-
sure switch error.
7.9.2 Er6: Atypical evaporator temperatures
If the evaporator temperature (T6) is higher than the temperature before the evaporator (T5) +
the value set in menu point
E60 after one hour with the compressor in operation, the compres-
sor will turn off. “Er6” will show in the display. See also section 7.4.2,
E60
.
7 Control and Operations