Hoshizaki F-500BAJ Service Manual page 44

8) Disconnect the inlet and outlet tubing.
9) Remove the socket head cap screws and split lock washers securing the evaporator to
the lower housing.
10) Lift off the evaporator.
11) Inspect the mechanical seal and O-ring prior to installing the new evaporator. The
mechanical seal consists of two parts. One moves along with the auger, and the other
is fixed on the lower housing. If the contact surfaces of these two parts are worn,
cracked, or scratched, the mechanical seal may cause water leaks and should be
replaced. Instructions for removing the mechanical seal and lower housing are located
later in this procedure.
12) Make sure the lower mechanical seal is in place, then place the evaporator in position.
Secure the evaporator to the lower housing using the socket head cap screws and split
lock washers.
13) Remove the drier, then place the new drier in position.
14) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
15) 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.
16) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled
models, see the nameplate for the required refrigerant charge. For remote models, see
the rating label inside the icemaker. Hoshizaki recommends only virgin refrigerant or
reclaimed refrigerant which meets AHRI Standard 700 (latest edition) be used.
17) Replace the removed parts in the reverse order of which they were removed.
Note: Be sure to use new seal bolts. See "Seal Bolt Removal and Installation
Instructions" earlier in this section.
18) Replace the top and side panels in their correct positions.
19) Move the control switch to the "ICE" position.
20) Move the power switch to the "ON" position.
21) Replace the front panel in its correct position, then plug the appliance into the electrical
outlet (F-300BAJ) or turn on the power supply (F-500BAJ).
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