7 Using the product
17
7.1.2 Automatic mode
The manifold automatically detects the pressure difference between the low-
pressure and high-pressure sides. If the measured pressure on the low pressure
side is 1 bar higher than on the high pressure side, a dialogue appears and the
display can be changed accordingly. If “yes” is selected, the low pressure moves
from left to right and the high pressure moves from right to left.
This mode is particularly suitable for air conditioning systems that provide
cooling and heating.
7.2 Measuring mode
WARNING
Risk of injury caused by refrigerant that is under high pressure, hot, cold,
or toxic!
> Wear protective goggles and safety gloves.
> Before applying pressure to the measuring instrument: Always fasten the
measuring instrument on the suspension hook to prevent it from falling
(danger of breakage).
> Before each measurement, check the refrigerant hoses are intact and
connected properly. Do not use any tools to connect the hoses; only tighten
hoses hand-tight (max. torque 5.0 Nm/3.7 ft*lb).
> Comply with the permissible measuring range (-1 to 60 bar/-14.7 to 870 psi).
Pay particular attention to this in systems with R744 refrigerant, since these
are frequently operated at higher pressures!
7.2.1 Refrigeration
The Refrigeration application is used to determine the following system
measuring values:
• High pressure
• Low pressure
• Refrigerant evaporating temperature
• Refrigerant condensation temperature
• Temperature of suction line
• Temperature of liquid line
• Superheating
• Subcooling
An NTC temperature probe (accessory) must be connected for
measuring the pipe temperature and for automatic calculation of
superheating and subcooling.
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