4)Recover the refrigerant and store it in an approved container.
5)Remove the thumbscrews and take off the spout from the evaporator.
6)Disconnect the water hoses.
7)Remove the allen head cap screws securing the extruding head. Using the cutter, lift out the auger assembly.
8)Remove the insulation and the expansion valve bulb on the suction line.
9)Disconnect the inlet and outlet tubing.
10)Remove the allen head cap screws securing the evaporator to the lower housing.
11)Lift off the evaporator.
12)Inspect the mechanical seal and
13)Make sure the lower mechanical seal is in place, then place the evaporator in position. Secure the evaporator to the lower housing using the allen head cap screws.
14)Remove the drier, then place the new drier in position.
15)Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
16)Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
17)Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge.
18)Replace the removed parts in the reverse order of which they were removed. When replacing the spout, make sure that the drip bracket is in the channel and that safety bracket B is behind safety bracket A. See Fig. 1.
19)Replace the panels in their correct positions.
20)Plug the unit back in.
6.Removal and Replacement of Mechanical Seal and Lower Housing
6a. Mechanical Seal
1)Drain water from the evaporator by using the flush switch.
2)Unplug the unit from the electrical outlet.
3)Remove the panels.
4)Remove the thumbscrews and take off the spout from the evaporator.
5)Remove the allen head cap screws securing the extruding head. Using the cutter, lift out the auger assembly.
6)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.
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