Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 - Manual (Page 50)

50
F. Removal and Replacement of Liquid Line Valve
CAUTION
1. Always install a new drier every time the sealed refrigeration system is
opened.
2. Do not replace the drier until after all other repair or replacement has been
made. Install the new drier with the arrow on the drier in the direction of the
refrigerant flow.
3. When brazing, protect the valve body and drier by using wet cloths to
prevent the valve body and drier from overheating. Do not allow the valve
body or drier to exceed 250°F (121°C).
1) Move the power switch to the "OFF" position, then unplug the unit.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the bolt and the solenoid.
5) Disconnect the valve.
6) Place the new valve in position.
7) Remove the drier, then place the new drier in position.
8) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
9) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of
refrigerant to the system (if using an electronic leak detector), and then raise the
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with
pressurized air for leak testing.
10) Evacuate the system and charge it with refrigerant; see the nameplate for the required
refrigerant charge.
11) Cut the leads of the solenoid allowing enough lead length to reconnect using closed
end connectors.
12) Connect the new solenoid leads.
13) Attach the solenoid to the valve body and secure it with the bolt.
14) Replace the panels in their correct positions.
15) Plug in the unit, then move the power switch to the "ON" position to start the unit's
cooling process.