Hoshizaki FD-1001MWH(-C) EN - Manual (Page 92)

92
K. Removal and Replacement of Liquid Line Valve or Suction Line Valve
- MLH Model (low side, parallel rack system)
CAUTION
1. Always replace the strainer when replacing the liquid line valve.
2. Always install a new drier every time the sealed refrigeration system is
opened.
3. 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.
4. 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) Turn off the power supply.
2) Remove the panels.
3) Isolate the icemaker from the rack system. See "V.A.4. Refrigerant Recovery,
Evacuation, and Recharge - MLH Model (low side, parallel rack system)" or the rack
system manufacturer's instructions.
4) Recover the refrigerant from the icemaker and store it in an approved container.
5) Remove the screw and the solenoid.
6) Disconnect the valve and strainer.
7) Place the new valve and strainer 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 and recharge the system. See "V.A.4. Refrigerant Recovery, Evacuation,
and Recharge - MLH Model (low side, parallel rack system)" or the rack system
manufacturer's instructions.
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 screw.
14) Replace the panels in their correct positions.
15) Turn on the power supply.