TESTO 557s - 8.2.4 Target Superheat

8 Using the product
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8.2.4 Target Superheat
This feature makes it possible to connect the testo 550s and testo 557s
manifolds to two additional testo 605i Smart Probes in order to calculate the
target superheat. 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. The target
superheat value appears on the display as a result.
The following are used for the measurement:
• testo 115i (clamp thermometer) or
• fixed cable probes
• testo 605i
in practice.
Alternatively, the values can be configured manually.
Before each measurement, check that the refrigerant hoses are in
flawless condition.
Before each measurement, zero the pressure sensors.

The instrument is switched on and the measurement menu is
displayed.

All connections must be pressureless (ambient pressure).

Bluetooth
®
is enabled.
1
Press [Menu/Enter].
2
Press [▲] / [▼] to select Measuring
Mode and press [Menu/Enter] to
confirm.