TESTO 550s - Page 28

8 Using the product
28
7.2
Connect the refrigerant hoses for low-pressure side (blue) and high-
pressure side (red) to the measuring instrument.
7.3
Connect the refrigerant hoses to the system.
8
Connect testo 115i/fixed cable probes.
9
Set refrigerant.
9.1
Press the key [▼] (Rxx) (refrigerant number according to ISO 817).
-
The refrigerant menu opens and the
current refrigerant is highlighted.
9.2
Setting the refrigerant: Press [▲] or
[▼] to select the refrigerant and
press [Menu/Enter] to confirm.
-
The newly set refrigerant is displayed in the refrigerant list.
10
Press the [▲] (P=O) key for 2 seconds to zero the sensors.
-
Zeroing takes place.
11
Pressurize the measuring instrument.
-
The measurement starts automatically.
-
Measurement results are displayed:
• Low/high pressure
• Condensation and evaporation temperature
• Suction and liquid line temperature
• Superheating and subcooling
• Target superheat TSH