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A.O. Smith AH 290 Manual

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2.3 Operation safety
High-pressure switch:
To prevent the compressor from exceeding its range of operation, there is
an integral high-pressure switch, which interrupts when the pressure is 20
bar in the cooling unit. Activate the red reset button once the cause of the
error has been identied. When the high-pressure switch interrupts, the red
LED will ash until the reset button manually or the pressure has fallen to
15 bar or the cause of error has been identied. When the high-pressure
switch interrupts, the red light will ash until the reset button on the
pressure switch is activated. In order to prevent a repetition of a pressure
switch error, the water may be set 2-3°C lower.
Safety breaker for electrical heating element
If an error occurs at the heater, the safety breaker trips and stops the heater
in order to prevent the tank from being overheated.
When working on the heat pump, always make sure the power
supply is disconnected. Any work on this unit may only be
carried out by trained personnel!
2.4 Warnings
High-pressure switch:
When the pressure switch trips, the red light on the display will light until the
pressure switch is reset.
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