Testo 550-2 Dgital Manifold Set 0563 5506 Data Sheet

6 Using the product 

14 

 

 

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 suspension device 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). 

>  Measures with the occurrence of danger. 

 

 

✓   The steps described in the chapter "Preparing for 

measurement" have been completed. 

1.

  Pressurize the measuring instrument. 

2.

  Read off readings. 

 

 

With zeotropic refrigerants, the evaporation temperature 
to/Ev is displayed after the complete evaporation/the 
condensation temperature tc/Co is displayed after the 
complete condensation. 

The measured temperature must be assigned to the 
superheating or the subcooling side (t

oh

 <--> t

cu

). 

Depending on this assignment, t

oh

/T1 or Δt

oh

/SH or t

cu

/T2 or 

Δt

cu

/SC is shown depending on the selected display. 

 

-  Reading and display illumination flash: 

•  1 bar before reaching the critical pressure of the refrigerant, 
•  upon exceeding the max. permissible pressure of 40 bar.