8)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
9)Evacuate the system, and charge it with refrigerant. For
10)Attach the expansion valve bulb to the suction line in the same location as the previous bulb. The bulb should be between the 10 and 2 o'clock position on the tube. Be sure to secure the bulb with the clamp and holder and to insulate it.
11)Place the expansion valve cover in position.
12)Replace the panels in their correct positions.
13)Turn on the power supply.
D.Removal and Replacement of Hot Gas Valve or Liquid Line Valve
CAUTION
1.Always use a copper tube of the same diameter and length when replacing the valve lines; otherwise, performance may be affected.
2.Always replace the strainer when replacing the hot gas valve.
3.Always install a new drier every time the sealed refrigeration system is opened.
4.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.
5.When brazing, protect the valve body and drier by using wet cloths to prevent the valve body and drier from overheating. Do not allow the valve body or drier to exceed 250°F (121°C).
1)Turn off the power supply.
2)Remove the panels.
3)Recover the refrigerant and store it in an approved container.
4)Remove the bolt and the solenoid.
5)Disconnect the valve. If replacing the hot gas valve, also remove the strainer.
6)Place the new valve and strainer (if applicable) in position.
7)Remove the drier, then place the new drier in position.
8)Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
9)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
72
