46
4. Removal and Replacement of Headmaster
(Condensing Pressure Regulator - C.P. Regulator)
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. Install the new drier with the arrow on the drier in the direction of the
refrigerant flow.
1) Turn off the power supply.
) Remove the panels.
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.
6) Place the new headmaster in position.
7) Remove the drier, then place the new drier in position (located in the icemaker). Install
the new drier with the arrow on the drier in the direction of the refrigerant flow.
8) Braze all fittings with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
CAUTION
Always protect the headmaster body by using a damp cloth to prevent it from
overheating. Do not braze with the headmaster body exceeding 50°F (11°C).
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 on the
condensing unit for the required refrigerant charge.
11) Replace the panels in their correct positions.
1) Turn on the power supply.
5. Removal and Replacement of Fan Motor
Note: When replacing a fan motor with defective winding, it is recommended that a new
capacitor be installed.
1) Turn off the power supply.
) Remove the panels.
3) Remove the closed end connectors from the fan motor leads.
4) Remove the fan motor bracket and fan motor.
