Removal And Replacement Of Drier; Removal And Replacement Of Expansion Valve - Hoshizaki KMD-900MRH Service Manual

4. Removal and Replacement of Drier

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 the pressure of 3-4 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. For air-cooled and water-
cooled models, see the nameplate for the required refrigerant charge. For remote
air-cooled models, see the charge label in the machine compartment.
8) Replace the panels in their correct positions.
9) Turn on the power supply.

5. Removal and Replacement of Expansion Valve

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.
IMPORTANT
IMPORTANT
61