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3.
WELDING REPAIR FOR R290 REFRIGERATION CIRCUIT
1)
Make sure the surrounding area of the unit to be repaired is free from ignition
sources.
2)
Open the window or operate the ventilator to make the surrounding well-ventilated.
3)
Connect the piercing valve. Recover the refrigerant in the specified manner or
discharge it into the atmosphere.
4)
The refrigeration circuit pressure is back to atmosphere pressure. Pressurize the
circuit using nitrogen.
5)
Discharge the pressurized nitrogen and recover the refrigeration circuit to
atmospheric pressure.
6)
Repeat 4) and 5) above. Use a gas detector at the open end of refrigeration circuit to
detect any gas left inside the circuit.
7)
Evacuate the refrigeration circuit for 30 minutes to remove any gas left inside the
circuit.
Note: Attach an access valve for recharging the unit charged by a lock ring.
4. COMPRESSOR
1) Unplug the ice dispenser or disconnect the power source.
2)
Remove the front panel and rear mesh.
3) Recover the refrigerant and store it in a proper container, if required by an applicable
law (See “2. [b] REFRIGERANT RECOVERY”).
4) Remove the terminal cover on the compressor and disconnect solderless terminals.
5) Disconnect the discharge and suction pipes using brazing equipment.
6) Remove the hold-down bolts, washers and rubber grommets.
7) Slide and remove the compressor. Unpack the new compressor package.
Remove the R290 refrigerant from the unit in an area well-ventilated and
free from open flames.
