User Manual

5 Using the manifold
12
Display
Description
is not displayed
Bluetooth is disabled.
2. To turn off the Bluetooth press [▲] and [▼] simultaneously and
hold down for 3 seconds.
- Once the Bluetooth icon is no longer shown on the display,
Bluetooth is switched off.
5.1.4. Measuring mode
Display
Mode
Function
Refrigeration
system
Normal functionality of the digital
manifold
Heat pump
Normal functionality of the digital
manifold
Automatic
mode
If the automatic mode is activated, the
testo 549 und testo 550 digital
manifolds automatically changes the
display of the high and low pressure.
This automatic change occurs when
the pressure on the low-pressure side
is 1 bar (15 psi) higher than the
pressure on the high-pressure side.
During the change,
Load (2 s) is
shown in the display.
This mode is especially suited to air
conditioning systems which cool and
heat (heat pumps).