Quantcast Figure   6-2.   Charging   refrigerrnnf   system   (Sheet   2   Of   2)

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Page Title: Figure 6-2. Charging refrigerrnnf system (Sheet 2 Of 2)
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Figure    6-2. Charging   refrigerant   system   (Sheet   1   of   2).
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TM-5-4120-239-14 Refigeration Unit Mechanical Panel Mounted For Refrigerator Prefabricated Eletric Motor Driven KECO Model F10000R-6 NSN 4110-01-077-B203 Gasoline Engine Driven Manual
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Figure  6-3.  Solenoid  valve,  exploded    view
STEP 3. STEP 4. STEP 5. STEP 6. SET THE REFRIGERANT DRUM IN AN INVERTED POSITION ON A SCALE, DO NOT OPERATE THE AIR CONDITIONER. OPEN CHARGING LINE VALVE AND  CHARGING  VALVE  AND  CHARGE  REFRIGERANT  SYSTEM  UNTIL SYSTEM AND DRUM PRESSURES HAVE EQUALIZED OR UNTIL 3.5 POUNDS OF  REFRIGERANT  HAVE  ENTERED  THE  SYSTEM. CLOSE VALVES AND CAREFULLY LOOSEN THE CHARGING LINE TO RELEASE TRAPPED PRESSURE. DISCONNECT CHARGING LINE AND INSTALL CHARGING VALVE CAP. OPERATE AIR CONDITIONER IN COOLING MODE FOR 15 MINUTES. CHECK  LIQUID  SIGHT  INDICATOR.  IF  SYSTEM  IS  SHORT  OF  REFRIGERANT, GAS BUBBLES WILL APPEAR REGULARLY IN THE INDICATOR. IF REFRIGERANT SYSTEM  IS  UNDERCHARGED,  ADD  ADDITIONAL  REFRIGERANT  FOLLOWING STEPS 6 THROUGH 9. USING SAME DRUM AND CHARGING LINE, PLACE DRUM IN AN UPRIGHT POSITION ON A SCALE. REMOVE CAP FROM LOW PRESSURE (SUCTION SIDE) CHARGING  VALVE  AND  LOOSELY  CONNECT  CHARGING  LINE  TO  VALVE. PURGE AIR FROM LINE AS IN STEP 2. CAUTION: WHEN  ADDING  REFRIGERANT,  USE  EXTREME  CARE  TO  AVOID  ADDING STEP 7. STEP 8. STEP 9. 6-4.   Repairing REFRIGERANT TO THE SYSTEM TOO FAST WHICH WOULD CAUSE SLUGGING AT THE COMPRESSOR. WITH THE AIR CONDITIONER OPERATING, ADMIT GAS TO SYSTEM SLOWLY (APPROXIMATELY 1 OUNCE PER MINUTE). CONSTANTLY OBSERVE DRUM WEIGHT TO INSURE THAT ONLY 3.5 POUNDS TOTAL WEIGHT OF REFRIGERANT IS IN SYSTEM. REPEAT STEP 4. CHECK LIQUID SIGHT INDICATOR. IF INDICATOR REGULARLY SHOWS BUBBLES, REPEAT STEPS 6 THROUGH 9 ADDING REFRIGERANT IN 4 OUNCE INCREMENTS UNTIL  INDICATOR  IS  CLEAR. ME4120-239-14/6-2 (2) Figure   6-2.   Charging   refrigerrnnf   system   (Sheet   2   Of   2). Refrigerant   Leaks a.   Locate   leak   (para   4-64). b.  Discharge   system   (para   6-3),   repair   leak,   and recharge   system   (para   6-3). Note. If soldering is necessary on any part of the system, a constant purge of dry nitrogen must be fed through the system being soldered to prevent scale formation within the system. 6-5.  Decontamination a.  General.   The   compressor   is   a   hermetically sealed  unit  and  cannot  be  repaired.  An  inoperative compressor  is  usually  due  to  a  mechanical  failure  or motor  burnout.  If  the  compressor  is  mechanically frozen   or   sustains   a   motor   burn   out   it   must   be replaced.   A   compressor   failure   generates   h i gh temperature  causing a   breakdown   of   oil   and refrigerant   with   the   resulting   formation   of   acid, moisture,   sludge.   These   products   are   extremely corrosive  and  ‘must  be  flushed  from  the  system  or repeated  burn  outs  will  occur. b.   Procedure. (1)  Discharge   system   and   purge   with   nitrogen (para  6-3). (2)   Remove   defective   motor   compressor   (para 5-17). (3)   With   compressor   out   of   system,   purge   all lines   with   dry   nitrogen. (4)  Install   a   new   compressor   (para   5-17) containing  a  full  and  proper  oil  charge. (5)  Replace  the  dehydrator  (para  5-24).  This drhydrator  will  later  be  replaced. 6-5

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