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Preparation for measurement
Pressure zeroing button
6.3
Hose connections
Fig. 20: Wöhler refrigerant hoses
6.4
Select refrigerant
Arrow keys
40
Press and hold the pressure zeroing button to
•
zero the pressure sensor. Make sure that no
additional pressure is applied to the port during
pressure zeroing so that only the ambient pres-
sure acts on the sensor.
NOTE!
It is recommended to perform a pressure zeroing
before each measurement.
ATTENTION!
Before each measurement, check that the refriger-
ant hoses are intact. Do not use any tools to con-
nect the hoses. Screw the hoses only hand-tight.
Close the valves on the meter with the aid of
•
the rotary knobs, cf. Fig. 1, part 5.
ATTENTION!
During all work on the system, ensure that the
valves on the appliance are opened and closed in
the correct sequence. This will prevent refrigerant
from escaping.
Connect the blue refrigerant hose to the low
•
pressure side, the red refrigerant hose to the
high pressure side and the yellow service hose
to the centre connection.
Press the arrow keys to select the refrigerant of
•
the system to be tested.
NOTE!
The refrigerant can only be selected in the satura-
tion temperature submenu, which appears immedi-
ately after switching on.
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