Hoshizaki KM-320MWH Removal and Replacement of Drier, Removal and Replacement of Expansion Valve

D. Removal and Replacement of Drier

IMPORTANT

Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made.

1)Turn off the power supply.

2)Remove the panels.

3)Recover the refrigerant and store it in an approved container.

4)Remove the drier.

5)Install the new drier with the arrow on the drier in the direction of the refrigerant flow. Use nitrogen gas at a pressure of 3 to 4 PSIG when brazing the tubings.

6)Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.

7)Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge.

8)Replace the panels in their correct positions.

9)Turn on the power supply.

E.Removal and Replacement of Expansion Valve

IMPORTANT

Sometimes moisture in the refrigerant circuit exceeds the drier capacity and freezes up at the expansion valve. Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made.

1)Turn off the power supply.

2)Remove the panels.

3)Recover the refrigerant and store it in an approved container.

4)Remove the insulation and the expansion valve bulb on the suction line.

5)Remove the expansion valve cover and disconnect the expansion valve using brazing equipment.

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