Hoshizaki 73168 service manual

13)Slide the refrigeration cartridge forward. Support the evaporator as it clears the evaporator case. See Fig. 2.

CAUTION

1.Be careful when handling the cabinet evaporator assembly. This assembly includes a defrost heater sheathed in a glass tube. This sheathing can be easily damaged and may also cause cuts if broken. The defrost heater will also be hot after a defrost. Use gloves when handling and avoid touching the glass directly. Also prevent the defrost heater from touching other parts.

2.To avoid refrigerant leaks, be sure to prevent the refrigeration piping from coming into contact with the frame when removing and replacing the refrigeration cartridge.

14)Once the repair is made, replace the refrigeration cartridge back into its correct position. Support the cabinet evaporator as it enters the cabinet evaporator case.

15)Reconnect the rail refrigerant tubes. Use a backup wrench and tighten the fittings 1/6 turn beyond fully seated. Be sure to use a backup wrench when tightening the fittings.

16)Secure the rail service valve bracket back in its correct position.

17)Secure the refrigeration cartridge with the attachment nuts, washers, and the hex head bolt.

18)Replace the wire cover and panels in their correct positions.

19)Open the rail high and low-side service valves. Back out the rail service valve stems all the way to their original position and tighten.

Note: Be sure the rail high and low-side service valve stems are backseated all the way out and tight.

20)Run in the receiver service valve stem a couple of turns for high-side system access. Note: Be sure the high-side gauge manifold hose is on the receiver service valve

before opening the receiver service valve.

21)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.

22)Evacuate the system. Then, charge the system with refrigerant; see the nameplate for the required refrigerant charge.

23)Back out the receiver service valve stem all the way and tighten, then close both gauge manifold valves.

Note: Be sure the receiver service valve stem is backseated all the way out and tight.

24)Cap the valves to prevent a possible leak.

25)Reconnect the power supply cord connector, rail thermistor connector, and perimeter heater/rail fan motor connector.

26)Plug the unit back in, then move the power switch to the "ON" position to start the unit's cooling process.

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