Hoshizaki KM-1340MAH, Service Manual

Page: 47 / 55

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2) Five minutes after a freeze cycle starts, confirm that the thermometer reads 104°F to
115°F (40°C to 46°C). If it does not, rotate the adjustment screw by using a flat blade
screwdriver until the temperature is in the proper range. See Fig. 1. Next, check that
the reference pressure is in the range indicated in the Head Pressure table in the
Performance Data section. If it is not in the proper range, verify the refrigerant charge.
3) Check that the condenser drain temperature is stable.
J. Removal and Replacement of Headmaster (Condensing Pressure
Regulator - C.P.R.) - Remote Air-Cooled Model Only
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.
2) Remove the panels from the remote condenser unit.
3) Recover the refrigerant and store it in an approved container.
4) Before heating, break off the stub on the dome to release the dome charge.
5) Disconnect the headmaster using brazing equipment.
6) Install the new headmaster. Use nitrogen gas at a pressure of 3 to 4 PSIG when brazing
the headmaster.
CAUTION
Always protect the headmaster body by using a damp cloth to prevent it from
overheating. Do not braze with the headmaster body exceeding 250°F (121°C).
7) Install the new drier in the icemaker.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
9) Evacuate the system and charge it with refrigerant. See the charge label in the machine
compartment in the icemaker.
Fig. 1
Adjustment
Screw
CW – Higher
CCW – Lower
Top View