Check with the compressor manufacturer regarding the discharge temperature.
CONVERSION GUIDE:
Fully recover the full load of R-404A or R-507A from the equipment using appropriate recovery cylinders. DO NOT MAKE EMISSIONS TO THE ATMOSPHERE. www.forofrio.com recommended not to mix Forane 407A with R-404A or R-507A. Weigh the amount of refrigerant removed.
Lubricants used with R-404A or R-507A can normally be used with Forane 407A. Check the suitability of the oil with the compressor manufacturer.
Analyze the lubricant (moisture, acidity, particles): This will give you an indication of the condition of the equipment. If the analysis is incorrect, an oil change may be necessary.
Forane 407A has a lower flow rate than R-404A and R-507A, so the
pipe size and expansion valve suitability.
Change the filter dehydrator.
Recharge the equipment with Forane 407A. The refrigerant must be charged in liquid phase.
forofrio-com recommends initially charging the same amount of R-404A or R-507A and then adjusting if necessary. The usual load is 5% to 7% higher with Forane 407A than with R-404A or R-507A. As Forane 407A is a non-azeotropic mixture, bubbles may appear in the compressor viewfinder, but this does not mean that there is an overload.
Start the installation. Record new working conditions and compare them with reference data obtained with R-404A or R-507A. Note that discharge pressures are lower with Forane 407A than with R-404A or R-507A. A decrease in pressure may be necessary (see equipment manufacturer's recommendations).
Adjust the load and expansion valve, if necessary.
Label the installation indicating that you are now working with Forane 407A.
