SHUTOFF AND ALARM SYSTEM COMPONENTS TESTING AND ADJUSTING 5. Make  sure  the  set  for  start  button  (13)  is  in  the RUN position. 6. Connect  the  8S4627  Circuit  Tester  between  the common     terminal     and     the     normally     closed terminal.  The light of the circuit tester must not be activated. 7. Turn  screw  (14)  clockwise  until  the  light  of  the circuit tester is activated. 8. Tighten the locknut. WIRING CONNECTIONS D.    Normally  closed  B  terminal        Normally  open  W terminal F.  Common R terminal 9. To check the adjustment, close shutoff fitting (7) and open shutoff fitting (6). 10. Connect    the    wires    to     the     normally     closed terminal. 11. Close  shutoff  fitting  (6)  and  slowly  open  shutoff fitting   (7)   until   the   engine   stops   or   the   alarm operates. 12. The   pressure   gauge   must    show    the    correct pressure    specification    of    the    switch    as    the engine stops or the alarm operates. CONTACTOR SWITCH FOR WATER TEMPERATURE Tools Needed: Fabricated heat sink. 2F7112 Thermometer. 3J5389 Plug. 8S4627 Circuit Tester. Method of Checking 1. Make  a  heat  sink  as  shown.    Material  can  be brass,  steel  or  cast  iron.    Drill  a  23/32  in.    hole through the plate and use a  tap  to  make  1/2  in. NPT threads. 2. Put    marks    on    the    two    contactor    wires    that connect the contactor to the circuit.  Disconnect the two wires. HEAT SINK [Dimensions in mm (in.)] 3. Remove the contactor and install a 3J5389 Plug. Install the contactor switch in the heat sink. 4. Put   the   heat   sink   and   contactor   in   water   as shown.    Use  blocks  to  support  the  heat  sink  at surface level. 5. Connect  the  8S4627  Circuit  Tester  between  the wires that connected the contactor to the circuit. TEST OF CONTACTOR SWITCH 1.  2F7112 Thermometer.  2 Fabricated heat sink. 6. Put the 2F7112 Thermometer in the water. 7. Use a torch to heat the water to the temperature range  at  which  the  contactor  must  activate.    If the  circuit  tester  light  does  not  come  on  within the temperature range given in the specifications,     make     a     replacement     of     the contactor. 8. Let the water temperature go down.  If the circuit tester light does not go out within the temperature   range   given   in   the   specifications, make a replacement of the contactor. 66