Quantcast Fan Drive Override Switch

Order this information in Print

Order this information on CD-ROM

Download in PDF Format

     

Click here to make tpub.com your Home Page

Page Title: Fan Drive Override Switch
Back | Up | Next

Click here for a printable version

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Combat
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
USMC
   
Products
  Educational CD-ROM's
Printed Manuals
Downloadable Books
   

 

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Back
Air Filter - TM-5-4210-230-14P-1_275
Up
TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
Next
Wiring Circuit Diagrams
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS Insufficient  evaporation  could  result  in  "slugging”    - drawing  of  liquid  refrigerant  into  the  compressor.    Also  an insufficient   flow   of   refrigerant   does   not   provide   adequate compressor lubrication. If  evaporator  outlet  pressure  drops  to  approximately 34  kPa  (5  psi)  the  low  pressure  switch  closes,  throwing  the low   pressure   switch   relay,   to   break   the   feed   circuit   to   the magnetic clutch and disengage the clutch.  (See wiring circuit diagram, Fig.  17.) Fig.  13 Low Pressure Switch Fan Drive Override Switch Vehicles  equipped  with  an  engine  cooling  fan  clutch have   a   fan   drive   override   switch   located   in   the   refrigerant compressor discharge service port. If compressor discharge pressure exceeds approximately  2070  kPa  (300  psi),  this  switch  engages  the engine  fan  drive  clutch  to  provide  maximum  air  flow  through the condenser. The fan drive override switch is similar in appearance to the low pressure switch illustrated in Fig.  13. Solenoid Control Valves Two  identical  solenoid  operated  control  valves  (Fig. 14)   may   be   used   in   conjunction   with   the   air   conditioning system to assure that there is sufficient air flowing through the condenser  to  prevent  excessive  refrigerant  compressor  head (discharge) pressure. The shutter control valve, activated by the thermostatic  temperature  control  switch,  opens  the  radiator shutter   and   keeps   it   open   (overriding   the   engine's   shutter control) while the air conditioning system is "ON". Fig.  14 Solenoid Valve On   engines   equipped   with   an   engine   cooling   fan clutch,  the  fan  drive  solenoid  valve,  responding  to  activation by   the   fan   drive   override   switch,   engages   the   fan   clutch whenever compressor discharge pressure becomes excessive. Refrigerant Hoses Hoses  and  tubing  are  used  to  carry  the  refrigerant from  the  compressor  to  the  various  components  of  the  air conditioning system and back to the compressor.  The hoses (Fig.  15) must withstand certain temperatures and pressures. Therefore  it  is  very  important  that  only  hoses  of  the  correct sizes and types be used in the air conditioning system. Fig.  15 Refrigerant Hoses Refrigerant The  refrigerant  is  the  substance  which  absorbs  and removes the heat from the cab.  It must be a substance that can be easily converted from a liquid to a vapor and back to a liquid  at  reasonable  temperatures.    In  other  words,  it  must vaporize   at   normal   ambient   temperatures   so   that   it   can absorb the heat while passing through the evaporator. The  type  of  refrigerant  used  in  IH  air  conditioning systems is R-12. CTS-2731   Page 9 PRINTED IN UNITED STATES  OF AMERICA

Privacy Statement - Press Release - Copyright Information. - Contact Us - Support Integrated Publishing

Integrated Publishing, Inc.