User Manual

5 Using the manifold
13
5.2. Performing the measurement
WARNING
Risk of injury caused by refrigerant that is at high pressure,
hot, cold, or poisonous!
> Wear safety goggles and protective gloves.
> Before pressurizing the measuring instrument: Always fasten
the measuring instrument at the hanging hook in order to
prevent it from falling (risk of breakage)
> Check if the refrigerant hoses are intact and connected
correctly before each measurement. Do not use a tool to
connect the hoses. Only tighten the hoses by hand (max.
torque 5.0 Nm/3.7 ft*lb).
> Do not exceed the permissible measuring range (0 to 870 psi /
0 to 60 bar). Pay particular attention with systems with
refrigerant R744, as these are often operated with higher
pressures.
Measuring
1. Connect and apply pressure to the manifold.
2. See readings.
Note: With refrigerants that have a temperature glide, “Zeotropes”
the evaporation temperature Ev/to and condensation temperature
Co/tc are displayed after evaporation and condensation are
complete.
Zeotropes (refrigerants blends mix together) can separate from
each other, unlike azeotropes which mix together to become one.
Zeoptropes often blend refrigerants with different boiling points
(saturation temps), where one will change from liquid to vapor
before the other as they go through the evaporator.
The glide is the difference between the lowest boiling point and the
highest boiling point. If they are 3 degrees apart, for example, the
blend has a 3 degree glide.