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AIR  CONDITIONING  PERFORMANCE  CHECK  (PRESSURE TEST)
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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EVACUATING THE AIR CONDITIONING SYSTEM
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS 1. Raise hood. 2. Connect SE-2443 Service Station to air conditioning system service ports as follows: a. Close  manifold  suction  and  discharge  gauge valves (turn fully clockwise). b. Remove cap from compressor suction service port.  Connect manifold suction gauge hose to compressor suction service port. c. Remove   cap   or   engine   fan   drive   override switch (if equipped) from compressor discharge   service   port.      Connect   manifold discharge gauge hose to compressor discharge service port. d. Route    the    service    hose    from    the    center manifold fitting into the shop exhaust removal system or out of doors. 3. Open the manifold gauge valves a slight amount and allow refrigerant to discharge SLOWLY. Do   not   allow   refrigerant   vapor   to   discharge   too rapidly as it will carry out the compressor oil as well. When refrigerant has been discharged, both manifold gauges will read zero. 4. After  refrigerant  has  been  removed,  air  conditioning system components can be removed for service. CHECKING COMPRESSOR OIL LEVEL The compressor is designed to provide a pressurized oiling system where required, without the use of a mechanical pump.  As long as a refrigerant flow is maintained, a certain amount  of  oil  will  circulate  with  the  refrigerant  through  the system.      When   the   compressor   is   operating,   there   is   a pressure  difference  between  the  top  of  the  cylinder  and  the crankcase.    This  pressure  difference  causes  some  oil  to  be forced  down  the  cylinder  wall,  thus  lubricating  some  of  the compressor parts. Since  some  of  the  oil  from  the  compressor  pump  is picked    up    and    circulated    through    the    system    with    the refrigerant, it is very important that the compressor oil level be checked whenever the system is opened for service. To check compressor oil level, proceed as follows: 1. Discharge refrigerant from system. (See "Discharging the Air Conditioning System".) 2. Remove  oil  fill  plug  from  side  of  compressor  (Fig. 36). In   some   cases   it   may   be   necessary   to   remove compressor   from   engine   to   gain   access   to   oil   fill plug. Fig.  36   Compressor Oil Fill Plug 3. Insert  dipstick  through  oil  fill  hole  until  it  bottoms  in compressor crankcase. It may be necessary to rotate compressor crankshaft slightly to permit entrance of dipstick.  Be certain that dipstick is bottomed in crankcase. Dipstick can be made locally from a 3.175 mm (1/8") diameter   steel   rod   as   shown   in   Fig.      37,   or   is available under service tool number SE-2392-3. Fig.  37   Dimensions for Making Oil Level Dipstick CTS-2731   Page 22 PRINTED IN UNITED STATES OF AM ERICA

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