Quantcast Figure  6-2.  Charging  refrigerant  system  (Sheet  2  of  2)

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Figure 6-2. Charging refrigerant system (Sheet 1 of 2)
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TM-5-4120-361-14 Air Conditioner Vertical Compact 18 000 BTU/HR 208 Volts 3 Phase 50/60 Hz (Model 18K 208 3 60) Manual
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Figure  6-3. Solenoid valve, exploded view
TM 5-4120-361-14 repaired.  An  inoperative  compressor  is  usually  due  to  a (7) Triple evacuate system and charge with mechanical failure or motor burnout. If the compressor is refrigerant  R22. mechanically frozen or sustains a motor burnout, it must be replaced. A compressor failure generates high temperature (8)  Start  air  conditioner  (figure  2-5)  and  operate causing a breakdown of oil, refrigerant and motor insula- unit  for  24  hours. tion,  with  the  resulting  formation  of  acid,  moisture,  and sludge. These products are extremely corrosive and must be (9) Discharge system and purge with nitrogen flushed from the system or repeated burnouts will occur. (figure 6-1). b.  Procedure. (10)  Install  new  dehydrator  (figure  5-7). (1)  Discharge  system  and  purge  with  nitrogen NOTE (figure 6-1). Whenever available, use recycled refrigerant for (2)  Remove  defective  motor-compressor charging  the  refrigeration  system. (figure 5-2). (11)  Evacuate  system  and  recharge  with  refriger- (3) Remove dehydrator (figure 5-7). ant (figure 6-2). (4) With compressor out of system, purge all (12)    Operate    air    conditioner. lines with dry nitrogen. 6-6.  Evaporator  and  Condenser  Coils. (5) Install a new compressor (figure 5-2) con- taining a full and proper oil charge. a.   Inspection. Inspect coils for damaged tubing and bent fins. Inspect threaded holes for damaged or stripped (6) Install new dehydrator (figure 5-7). In step threads. (10) this dehydrator will again be replaced. STEP 4. STEP 5. POSITION  REFRIGERANT  DRUM  UPRIGHT  ON  SCALE WITH LINES CONNECTED FOR GAS CHARGING. IF THE WEIGHT OF REFRIGERANT TO FULLY CHARGE THE SYS- TEM  IS  KNOWN,  OPERATE  AIR  CONDITIONER  WITH  CON- TROLS SET FOR MAXIMUM COOLING. OPEN REFRIGER- ANT DRUM VALVE, LOW PRESSURE CHARGING VALVE, AND LOW SIDE MANIFOLD VALVE. CONTINUE OPERA- TION UNTIL THE SYSTEM IS FULLY CHARGED, THEN CLOSE  VALVES.  STOP  AIR  CONDITIONER  OPERATION AND DISCONNECT CHARGING LINES. TO ADD REFRIGERANT TO SYSTEM WITH LOW CHARGE AS INDICATED BY BUBBLES IN LIQUID SIGHT INDICA- TOR: WITH  REFRIGERANT  DRUM  UPRIGHT,  CONNECT  LINES FOR GAS CHARGING THROUGH LOW SIDE MANIFOLD VALVE.  PURGE  CHARGING  LINES  BY  LOOSELY  CON- NECTING LINE AT DRUM VALVE AND SLIGHTLY OPEN- ING AIR CONDITIONER CHARGING VALVES. TIGHTEN LINE AT DRUM VALVE. OPERATE AIR CONDITIONER WITH  CONTROLS  SET  FOR  MAXIMUM  COOLING.  OPEN REFRIGERANT  DRUM  VALVE,  LOW  SIDE  MANIFOLD VALVE, AND LOW PRESSURE CHARGING VALVE ON AIR CONDITIONER.  CONTINUE  OPERATION  UNTIL  BUBBLES NO LONGER APPEAR IN SIGHT INDICATOR. THEN CLOSE LOW PRESSURE CHARGING VALVE ON AIR CONDI- TIONER. REPEAT CHARGING IF BUBBLES REAPPEAR IN SIGHT INDICATOR. WHEN BUBBLES DO NOT REAPPEAR AFTER  15  MINUTES  OF  OPERATION,  THE  SYSTEM  IS FULLY CHARGED. CLOSE CHARGING VALVES AND DIS- CONNECT  LINES. Figure  6-2.  Charging  refrigerant  system  (Sheet  2  of  2) 6-5

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