Wohler MR 400 Bedienungsanleitung Seite 36

Structure and functions
Number
1
2
3
4
5
6
7
8
36
Function
Temperature connections
LC - Display
Operating buttons
Sight glass refrigerant
Blue: Valve setting low pressure side
Red: Valve setting high pressure side
Opening the valves opens the passages from the high-
pressure or low-pressure side to the service connec-
tion.
NOTE!
The pressure is measured with the valves open and
closed.
Open the valve: Turn the knob anticlockwise
•
Close the valve: Turn the rotary knob clockwise.
•
ATTENTION!
Always operate the two valve settings by hand only,
never with pliers. Closing the knob too tightly can dam-
age the knob or the valve.
3 x hose holder (1/4 '' SAE)
ATTENTION!
If a refrigerant hose is connected to the unit but not to
the system, always use the suspension to protect the
hose from contamination.
Low pressure connection (Schrader 1/4 '' SAE)
Passage can be closed via valve adjustment.
Centre: e.g. for refrigerant bottles or for vacuum pump
High pressure connection 1/4 '' SAE