Testo 557 digital manifold Instruction manual

Below you will find brief information for digital manifold 557. The testo 557 is a digital manifold for maintenance and service work on refrigeration systems and heat pumps. It replaces traditional mechanical manifolds, thermometers and pressure/temperature charts. You can apply, adapt, test and monitor pressures and temperatures. The testo 557 is compatible with most non-corrosive refrigerants, including water and glycol, but not with ammonia. The testo 557 is not to be used in explosive environments.

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testo 557 Digital Manifold Instruction Manual | Manualzz

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Key features

  • Replaces mechanical manifolds, thermometers and charts
  • Measures pressures and temperatures
  • Compatible with most non-corrosive refrigerants
  • Features automatic leak test
  • Includes pressure sensor zeroing
  • Offers selectable refrigerant settings
  • Provides superheating and subcooling calculations
  • Delivers a vacuum measurement mode
  • Offers various display views
  • Includes a clear LCD display

Frequently asked questions

The testo 557 is compatible with most non-corrosive refrigerants, including water and glycol. However, it's not compatible with ammonia.

You can perform a temperature-compensated leak test to check for leaks in systems. Connect a temperature sensor to measure the ambient temperature and start the leak test. The result will be displayed, showing the temperature-compensated differential pressure and temperature at the beginning and end of the test.

The automatic mode automatically reverses the display of high and low pressure when the pressure in the low-pressure side is 1 bar higher than the pressure in the high-pressure side. This is particularly useful for air conditioning systems that provide both cooling and heating.
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