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CHECKING COMPRESSOR OIL LEVEL
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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ADDING REFRIGERANT TO AIR CONDITIONING SYSTEM
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS 4. Remove   dipstick   and   measure   wetted   portion   to determine oil level in compressor.  Compare oil level reading with specified oil level listed in SPECIFICATIONS. If  necessary,  add  refrigeration  oil  to  obtain  specified level.  (Refer to SPECIFICATIONS for oil type.) If  oil  level  is  higher  than  specified,  draw  out  excess oil to obtain correct level. After establishing correct oil level, reinstall oil fill plug and  gasket.    Tighten  plug  to  torque  value  listed  in TORQUE CHART Reinstall compressor on engine, if removed. EVACUATING THE AIR CONDITIONING SYSTEM Whenever the air conditioning refrigerant system has been  opened,  it  is  necessary  that  the  system  be  completely evacuated of air and moisture before being recharged. Outlined  below  is  the  procedure  for  evacuating  the system using the SE-2443 Portable Service Station. 1. Connect SE-2443 Service Station to air conditioning system service ports as follows: a. Close  all  valves  on  service  station  (turn  fully clockwise). b. Connect   suction   gauge   hose   to   compressor suction service port. c. Connect discharge gauge hose to compressor discharge service port. d. Connect  hose  from  center  fitting  on  manifold to   vacuum   pump   suction   fitting   on   service station. e. Open  manifold  suction  and  discharge  gauge valves (turn fully counterclockwise). 2. Start vacuum pump and SLOWLY open pump blank off valve. 3. After suction gauge on manifold shows that vacuum is   being   established   in   the   system,   open   vacuum gauge   valve   on   service   station   and   continue   to operate vacuum pump for ten (10) minutes. 4. Close  pump  blank  off  valve  and  observe  electronic vacuum gauge for one (1) minute.  The meter should not   indicate   a   rise   of   more   than   5   millimeters   of mercury.    If  gauge  rises  more  than  5  millimeters  of mercury in one (1) minute, system has a leak which must be repaired. 5. Open  pump  blank  off  valve  and  continue  to  operate vacuum pump for an additional twenty (20) minutes. Then    close    pump    blank    off    valve    and    observe electronic   vacuum   gauge.      If   meter   reading   stays below  4  millimeters  of  mercury  for  two  (2)  minutes, system is ready to be charged. 6. With    vacuum    pump    still    operating,    close    both manifold   gauge   valves,   pump   blank   off   valve   and vacuum meter valve.  Turn off vacuum pump. Do    not    disconnect    manifold    gauge    hoses    from compressor    service    ports    prior    to    charging    the system. CHARGING    THE    AIR    CONDITIONING    SYSTEM    (FULL CHARGE) In    preparation    for    charging,    the    air    conditioning system  must  be  evacuated  of  all  air  and  moisture  and  be completely  leak  free.    (See  "Evacuating  the  Air  Conditioning System".) To charge the system, utilizing the SE-2443 Portable Service    Station    and    SE-2448    Heated    Charging    Cylinder, proceed as follows: 1. Manifold suction and discharge gauge hoses remain connected to compressor service ports from evacuating operation. 2. Fill  SE-2448  Charging  Cylinder  with  2.25  kg  (5  lbs.) of   refrigerant.      (Follow   equipment   manufacturer's instructions.)    Make    sure    all    valves    on    charging cylinder are closed after filling. 3. Connect  service  hose  from  center  manifold  fitting  to bottom valve on charging cylinder. 4. Open  bottom  valve  on  charging  cylinder  and  loosen center  hose  connection  at  manifold  for  10  seconds, or  until  hose  fitting  becomes  cold,  to  purge  air  from hose; then tighten hose connection. 5. With  the  engine  shut  off,  open  manifold  discharge gauge valve and fill air conditioning system with 2 kg (4.5  lbs.)  of  refrigerant.    (Follow  charging  cylinder manufacturer's instructions.) DO  NOT  overcharge  the  system.    Excessively  high head   pressures   during   operation   will   result   from overcharging. 6. When    system    is    fully    charged,    close    manifold discharge    valve    and    bottom    valve    on    charging cylinder.    Slowly  loosen  hose  connection  at  bottom valve    on    charging    cylinder    and    allow    refrigerant pressure   to   bleed   off;   then   disconnect   hose   from valve. CTS-2731   Page 23 PRINTED IN UNITED STATES OF AMERICA

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