Hoshizaki RELIABILITY IS A BEAUTIFUL THING DCM-270BAH-OS - Manual (Page 31)

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14) Place the new expansion valve cover in position.
15) Replace the panels in their correct positions.
16) Plug in the dispenser and turn on the power supply.
6. Removal and Replacement of Pressure Switch
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 and unplug the dispenser.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the control box cover and disconnect the terminals.
5) Remove the pressure switch using brazing equipment.
6) Braze the new pressure switch with nitrogen gas flowing at the pressure of 3-4 PSIG.
7) Install the new drier.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
9) Evacuate the system, and charge it with refrigerant. See the nameplate for the required
refrigerant charge.
10) Replace the terminals and the control box cover in their correct positions.
11) Replace the panels in their correct positions.
12) Plug in the dispenser and turn on the power supply.