A.O. Smith 290 service manual 2.3Operation safety High-pressureswitch

2.3Operation 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 identified. When the high-pressure switch interrupts, the red LED will flash until the reset button manually or the pressure has fallen to 15 bar or the cause of error has been identified. When the high-pressure switch interrupts, the red light will flash 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!

2.4Warnings

High-pressure switch:

When the pressure switch trips, the red light on the display will light until the pres- sure switch is reset.

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