3 Optional dual control instructions (DIRECTAIR) 5 through 15 HP single-stage units are available with  pneumatic  dual  control.    This  option  allows  operation  to meet  air  demand.    When  air  requirements  are  average  the "auto" mode of operation is suggested.  When air demand is high, the "constant" mode of operation may be used. The  main  components  of  the  dual  control  system  are  the pressure  switch  and  the  pilot  valve.    In  the  auto  mode  of operation, the compressor is regulated by the pressure switch. When   air   pressure   reaches   the   preset   upper   limit   of   the pressure switch the unit will unload and shut down.  When tank pressure  drains  to  the  lower  limit  of  the  pressure  switch,  the unit  will  start  up  and  begin  pumping  again  In  the  constant mode  of  operation,  the  compressor  is  regulated  by  the  pilot valve.  On the top of the pilot valve is a control knob. By   turning   this   knob   counter-clockwise,   tank   pressure   is allowed to flow through it.  The unit will pump until the preset upper limit of the pilot valve is reached.  At this time, the unit will remain running however, the compressed air is vented to the  atmosphere  instead  of  flowing  into  the  tank.    When  tank pressure  decreases  to  the  lower  pressure  limit  the  unit  will again pump air into the tank. To return to the stop/start mode of operation, simply turn the control knob on the pilot valve clockwise. Warning: The pressure switch and pilot valve are preset to specified settings.  These settings must not be altered. 4 Maintenance schedule Routine maintenance insures trouble-free operation and protects     your     investment.          All     warranties     are     void     if maintenance is neglected. Daily: 1. Check oil level, which should be in lower half of the sight  glass.    Add,  if  necessary,  using  oil  mentioned “Initial start-up" 2. Turn off power at main fuse box and drain  moisture from tank by opening the drain cock in the bottom of the tank. Weekly: 1. Remove  and  clean  air  intake  filter  with  compressed air Replace if necessary. 2. Turn  off  power  and  clean  dust  and  foreign  material from entire unit Monthly: 1. Test operation of safety valve by pulling the test link. Air   from   the   tank   should   escape.      If   it   does   not, replace  the  safety  valve.    This  valve  cannot  be adjusted. Note: In the event the unit ran over pressure, this safety valve would reduce tank pressure to a safe level.  Be sure it will work properly.  Never run the unit without this safely valve. Every six months or after 1000 hours [max I of operation: 1. Change the lubricating oil 2. Check   overall   operation   of   unit.      It   should   be   as described in these instructions.  A sudden change in performance   indicates   a   problem   developing,   and should be investigated Warning: Do not use petroleum based or other flammable solvents for cleaning. 5 Trouble shooting Condition Possible faults Suggested remedy 1. Compressor does not start a. No electrical power a. Check or have electrical system checked b. Receiver pressure between starting and b. Wait until pressure drops stopping pressures c. Coupling sleeve damaged c. New sleeve 2. Compressor does not pump a. Unloader jammed a. Disassemble and clean unloader b. Solenoid valve not energized b. Have electrician check wiring 6