Wohler MR 400 Bedienungsanleitung Seite 46

Measurement menus
7.1.3 Submenu: Temperature
difference (Δ T)
Fig. 24: Display submenu temperature
difference
7.2 Measuring menu VAC: Vacuum
Fig. 25: Connections: Vacuum measure-
ment
+
46
In the submenu "Superheat/Subcooling", press
the Mode button to enter the submenu "Tempera-
ture difference". The display shows
Line 1
Temperature low pressure side
Refrigerant
Temperature high pressure side
Line 2
Δ T = T - T
H L
Line 3
Pressure low pressure side
Pressure high pressure side
A vacuum pump is required to evacuate the sys-
tem.
Connect the coolant hoses to the system.
•
Connect the unit to a vacuum pump via the
•
yellow service hose and the centre unit con-
nection.
The unit thus connects the vacuum pump to the
system.
In the PT measuring menu, briefly press the
•
mode and arrow keys simultaneously.
The unit switches to the vacuum measurement
menu. VAC appears at the top left of the display.
Switch on the vacuum pump to extract air and
•
moisture from the unit.