Amana Bottom Mount Refrigerator service manual HFC134a Service Information

HFC134a Service Information

WARNING

To avoid severe personal injury or death from fire keep system free from contamination due to presence of air. Follow instructions exactly.

Before opening system evaporator coil must be at ambient temperature to minimize moisture infiltration into system.

1.After capturing refrigerant, replacing drier and making any repairs, evacuate system from high side through drier/process tube and low side through compressor process tube simultaneously. Evacuation should not be done through line piercing valve but through I.D. opening of tubes.

2.With valves “C” and “F” closed to thermistor vacuum gauge and charging cylinder, open all other valves and start vacuum pump.

3.At approximately 29 inches of vacuum, open valve “C” to thermistor vacuum gauge and take micron reading.

4.Continue evacuating system until thermistor vacuum gauge registers 600 microns.

5.At 600 microns close valve “A” to vacuum pump to allow micron reading in system to balance. Micron level will rise. If in 2 minutes, micron level stabilizes at 1000 microns or below, system is ready for charging.

•If micron rises above 1000 micron level and stabilizes, open valve “A”to vacuum pump and continue evacuating.

•If micron reading rises rapidly and does not stabilize, a leak still exists in system. Close valve “A”to vacuum pump and “C”to thermistor vacuum gauge. Invert charging cylinder and open charging cylinder valve “F”to add partial charge for leak checking. With leak detector, check manifold connections and system for leaks. After locating leak, capture refrigerant charge, repair leak, and begin at step 1.

6.Once system is ready to charge, close valve “A” (vacuum pump), “C” (thermistor vacuum gauge), and “E” (low side manifold gauge).

7.Check serial plate for correct charge and set scale on dial-a-charge cylinder for corresponding HFC134a pressure reading. Do not use captured or recycled refrigerant in Amana® refrigerators. Use of captured or recycled refrigerant voids any warranty.

8.Open valve “F” to charging cylinder and let exact amount of refrigerant out of cylinder. Close valve. Low side gauge pressure should rise shortly after opening charging cylinder valve as system pressure equalizes through capillary tube. If pressure does not equalize, a restriction typically exists at capillary/drier braze joint.

9.If no restriction exists, open valve “E” (low side manifold gauge) and pinch off high side drier process tube.

10.Start compressor and draw remaining refrigerant in charging hoses and manifold into compressor through compressor process tube. To check high side pinch-off drier process tube, close valve “D” (high side gauge). If pinch-off is not leaking, high side pressure will not rise. If high side pressure gauge shows an increase, repeat high side pinch- off and open valve “D”. Repeat until high side pinch-off no longer leaks.

11.Pinch-off compressor process tube and remove charging hose. Braze stub closed while compressor is operating.

12.Unplug refrigerator from electrical outlet. Remove charging hose and braze high side drier process tube closed.

RS1200001 16 November 1996