Amana Bottom Mount Refrigerators Evacuation

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Proper evacuation of sealed refrigeration system is an important service procedure. Usable life and operational efficiency greatly depends upon how completely air, moisture and other non-condensables are evacuated from sealed system.

Air in sealed system causes high condensing temperature and pressure, resulting in increased power requirements and reduced performance.

Moisture in sealed system chemically reacts with refrigerant and oil to form corrosive hydrofluoric and hydrochloric acids. These acids attack motor windings and parts, causing premature breakdown.

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

Evacuation
To evacuate sealed refrigeration system:
1. Connect vacuum pump, vacuum tight manifold set with high vacuum hoses, thermocouple vacuum gauge and charging cylinder as shown in illustration. Evacuation should be done through I.D. opening of tubes not through line piercing valve.
2. Connect low side line to compressor process tube.
3. Connect high side line to drier/process tube.
4. Evacuate both simultaneously. With valve “C” and “F” closed, open all other valves and start vacuum pump.

Amana Bottom Mount Refrigerators Evacuation Amana Bottom Mount Refrigerators Evacuation

5. After compound gauge (low side) drops to approximately 29 inches gauge, open valve “C” to vacuum thermocouple gauge and take micron reading.

6. Continue evacuating system until vacuum gauge registers 600 microns.
7. At 600 microns, close valve “A” to vacuum pump and 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 to be charged.
• If micron level rises above 1000 microns and stabilizes, open valve “A” 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 valve “C” to 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, repair leak, and begin at step 1.

 

Models :

ABB1921DE*
ABB1924DE*
ABB1927DE*
ABB192ZDE*
ABB2224DE*
ABB2227DE*
ABB222ZDE*
ABB2524DE*
ABB2527DE*
ABC2037DPS
ABC2037DT*
ABD2233DE*
ABD2533DE*
ABR2224DE*
ABR2227DE*
ABR222ZDE*
AFD2535DE*

 

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