Hoshizaki FD-1001MWH(-C) EN - Manual (Page 93)

93
L. Removal and Replacement of Evaporator Pressure Regulator (E.P.R.)
MLH Model (low side, parallel rack system)
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 E.P.R. and drier by using wet cloths to prevent the
E.P.R. and drier from overheating. Do not allow the E.P.R. 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 and store it in an approved container.
5) Remove the E.P.R. valve.
6) Place the new E.P.R. valve in position.
7) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
8) 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.
9) 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.
10) Replace the panels in their correct positions.
11) Turn on the power supply.
M. Removal and Replacement of Water Valves
1. Inlet Water Valve
1) Turn off the power supply.
2) Remove the panels.
3) Close the water supply line shut-off valve
4) Open the water supply line drain valve.
5) Disconnect the terminals from the inlet water valve.