Hoshizaki HUR40A(-D) - Manual (Page 49)

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1) Turn off the power supply, and unplug the unit.
2) Remove the front panel, then remove the wire guard located below the display panel.
3) Unhook the wiring connectors at the control box, then remove the two hex-head M6
attachment nuts and the M5 bolt.
4) Very carefully slide out the refrigeration system. Support the evaporator as it clears the
evaporator case.
5) Recover the refrigerant and store it in an approved container.
6) Remove the terminal cover on the compressor and disconnect the compressor wiring.
7) Remove the discharge, process, and suction pipes.
8) Remove the hold-down bolts, washers, rubber grommets, and sleeves.
9) Remove the compressor. Unpack the new compressor. Attach the rubber grommets
and sleeves of the prior compressor.
10) Place the new compressor in position, and secure it using the bolts and washers.
11) Remove the drier, then place the new drier in position.
12) Remove the plugs from the suction, discharge and process pipes.
13) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
14) 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 or R-134a as a mixture
with pressurized air for leak testing.
15) Evacuate the system, and charge it with refrigerant; see the nameplate for the required
refrigerant charge.
16) Connect the terminals, then replace the terminal cover in its correct position.
17) Return the refrigeration unit to its proper position in the reverse order of the removal
procedure.
18) Plug in the unit, and turn on the power supply.
D. Removal and Replacement of Evaporator
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, and unplug the unit.
2) Remove the front panel, then remove the wire guard located below the display panel.
3) Unhook the wiring connectors at the control box, then remove the two hex-head M6
attachment nuts and the M5 bolt.