E. Removal and Replacement of Capillary Tube / Suction Line Assembly
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
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 insulation on the suction line.
7)Remove the four 4×8 T2 screws holding the evaporator to the evaporator bracket and provide a safe means for supporting the evaporator away from the ABS liner of the evaporator case cover. Protect any wiring from damage due to the brazing torch.
8)Remove the capillary tube / suction line assembly and drier.
9)Place the new capillary tube / suction line assembly and new drier in position.
10)Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 psig.
CAUTION
1.Care must be taken to ensure that the capillary tube is not blocked or contaminated during this process.
2.Ensure that the capillary tube extends inside the mating tubing 1 to 1 3/8"
(25 to 35 mm).
11)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
12)Insulate the entire suction line between the compressor and evaporator case.
13)Evacuate the system, and charge it with refrigerant; see the nameplate for the required refrigerant charge.
14)Return the refrigeration unit to its proper position in the reverse order of the removal procedure.
15)Plug in the unit, and turn on the power supply.
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