Instructions

9 Smart App
53
Reading and display illumination flash:
• 1 bar/14.5 psi before reaching critical refrigerant pressure
• When max. permissible pressure of 60 bar(870 psi is exceeded.
9.3.3 Target superheat
This feature allows the testo 550s / testo 557s manifold to calculate the target
superheat in conjunction with the App and additional testo 605i Smart Probes.
This application can only be used for split air conditioning systems/heat pumps
with a fixed expansion valve. The two connected testo 605i Smart Probes
determine the ODDB and RAWB values. As a result, the target superheat
appears in the App.
The following are used for the measurement:
• testo 115i (clamp thermometer)
• testo 605i
Before each measurement, check that the refrigerant hoses are in
flawless condition.
Before each measurement, zero the pressure sensors.
1
Click on Measure.
2
Click on Target superheat.

The Target superheat measurement menu opens.
3
Click on .

Configuration menu opens.