Refrigerant Removal, Recovery, And Evacuation - Friedrich Kuhl KCS12B10A Service Manual

Refrigerant Removal, Recovery, and Evacuation

NOTE: When accessing the refrigerant in the system to make repairs or for any other purpose, conventional procedures shall be used. However, for
FLAMMABLE REFRIGERANTS (R-32 is classified in the A2L group for mildly flammable refrigerants) it is important that best practice is followed since
flammability is a consideration. Follow all EPA 608 regulations and procedures along with AHRI 15 Best Practices for A2L refrigerants.
Warning:
Ensure sufficient ventilation at the repair place.
Warning:
Ensure there are no open flame sources or hot surfaces that exceed 1200˚F in the work area.
Warning:
Discharge capacitors in a way that won't cause any spark. The standard procedure to short circuit the capacitor terminals usually
creates sparks.
NOTICE: Ensure that the following precautions are taken prior to opening the sealed system.
• Verify Recovery machine is rated for A2L refrigerants.
• Mark the Job site inspection area as flammable work zone using appropriate signs.
Utilize a Refrigerant leak detector or refrigerant monitor to sense the area for the presence of refrigerants.
•
Disconnect all power supply to unit.
•
Properly ground all equipment and hoses along with tank to prevent a static build up .
•
• Ensure adequate ventilation is provided for the job site.
• Do not mix A2L refrigerant Gages and hoses with other refrigerants.
• Keep exposure of refrigerant to Air to as minimum as possible (creates a dangerous condition).
Under no circumstances is the mixing of refrigerants in the recovery cylinders allowed and should be strictly avoided at all times. Do not
•
introduce oxygen into any recovery cylinders.
1. Install a piercing valve to recover refrigerant from the sealed system. (Piercing valve must be removed from the system before recharging.)
2. Recover refrigerant to EPA sec. 608 standards. If a low charge is suspected weigh recovered refrigerant and compare to unit nameplate.
NOTE: DO NOT RECOVER TO A VACUUM PRIOR TO FLUSHING WITH NITROGEN. STOP RECOVERY AT 0-5 PSI.
3. Flush refrigerant out of system with a dry nitrogen purge, make sure you energize and de-energize all reversing valves and solenoid valves to release
any trapped refrigerant.(3-5 minutes).
4. Perform an evacuation to 29.9 in. hg. and break vacuum with Dry Nitrogen.
5. Re-purge the unit for 3-5 mins or until the nitrogen flows out both process tubes.
6. Re-evacuate unit to 29.9 in. hg. and break vacuum with Dry Nitrogen.
8. Open the refrigerant circuit by cutting out components.
9. Cut off the crimp on the process tubes and install a 5/16 copper access fitting to the process tube.
Transportation
Be aware that local, state, and national codes exist that regulate the transportation of flammable gases. Be sure to become informed of the regulations and always stay
compliant.
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R-32 SEALED SYSTEM REPAIR