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Information for Technical Services – Cooling equipment with R290 refrigerant gas (Propane) - R600a
Any service on cooling equipment charged with R290/R600a refrigerant gas must be performed only by well skilled
and trained personnel on R290/R600a gas handling procedures. The activities must be performed by personnel
indicated by the Manufacturer or by the Dealer who sold the cooling equipment.
* N.B.- The opening of the refrigeration circuit has to be done from the gas charging pipe, after the charge the
circuit MUST be tightly closed by sealing the charging pipe.
The service and any kind of intervention on the refrigeration system of cooling equipment charged with refrigerant gas
R290/R600a requires additional precautions!
1. It is not possible to carry out refrigerant filling, draining, emptying, or recharging operations because the entire
refrigeration circuit is hermetically sealed.
2. Before starting any work, turn off the cooling equipment and disconnect its electrical plug from the power supply socket.
3. The working tools must be suitable for repairing cooling equipment charged with R290/R600a gas.
4. The intervention on the refrigeration circuit must be performed in well ventilated areas or outdoors only.
5. Make sure that there are no open flames or other heat sources (such as electrical switches, etc.) close to the appliance.
And do not smoke!
6. Open the refrigeration circuit on the ad-hoc gas-charging pipe by removing the cap attached to the end. If necessary
retrieve the R290/R600a gas with proper equipment.
7. Before using any flame, fill the circuit of nitrogen in order to eliminate any R290/R600a gas residues.
8. Empty the nitrogen from the circuit. Start repairs by replacing the faulty parts, (replace the drier filter if necessary).
9. Once repairs have been completed, make the vacuum in the refrigerant circuit through the charging pipe, using the
appropriate throttle valve or the "Schrader" adaptor previously welded to the end.*(See note).
10. After the vacuum phase has been completed, start charging the gas entering 50% of the quantity of R290/R600a gas
indicated on the rating plate applied on the cooling appliance. Connect its electrical plug to the power supply socket.
11. Turn on the power on the appliance (see par.5), wait for compressor's start-up, and then complete unit charging with
remaining 50% quantity of R290/R600a gas.
12. Verify the correct appliance operations.
13. while the appliance is running, seal the end of the charging pipe with an ad-hoc cap available in the tools set. With a proper
tool clamp the charging pipe 2 times, about 2-3 cm distant from each other, just behind the cap.
14. Turn off the appliance and check the tightness of the refrigeration circuit with a leak detector calibrated to detect the
R290/R600a gas.
In case of need you can weld a "Schrader
”
adaptor to
perform vacuum operations and refrigeration circuit filling. Once the R290/R600a gas filling has been completed, clamp the
charging pipe with the proper tool, just behind "Schrader" adaptor, at least 2 times, at about 2-3 cm distant from each other.
