Dantherm AC-24, Service Manual

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Introduction
This topic describes the HP/LP function.
System protection The cooling system is protected by pressure switches. If the pressure falls outside of the
normal operating range, the air conditioner compressor is automatically switched off. This is
to prevent component damage. If the pressure is too high or too low, the unit is switched off.
The malfunction must normally be identified by a trained technician and corrected.
Reset
The HP/LP pressure switch automatically resets after a few minutes.
If the lamp continues to illuminate, please refer to the “Fault finding guide”.
LP (low pressure) The cooling system is protected by a low-pressure switch (LP switch). The switch is set at 1
bar and will automatically reset at 2.5 bar. The safety function cuts off the com-pressor.
The LP function will be activated if:
•
The cooling system loses refrigerant
• The internal temperature is so low that the low pressure gets below set point (1 bar).
Do not operate the product with frequent operating LP function.
•
The evaporator is blocked or does get not sufficient air flow
HP (high pressure) The cooling system is protected by a high-pressure switch (HP switch). The switch is set at 25
bar and will automatically reset at 18 bar. The safety function cuts off the compressor.
The HP function will be activated if:
•
The outdoor temperature is too high
• The condenser is blocked or does not have sufficient airflow
Description of the high and low pressure switch function
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