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CONDENSERS
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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CONTENTS - TM-5-4210-230-14P-1_549
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL Fig. 8 Construction of Condenser Heavy-duty condensers require more insulation between  foil  sheets  of  the  winding.  Since  heavier  insulation also increases the distance between foil sheets, more foil area is needed to obtain the same capacity.  This is accomplished by using a larger assembly, Fig. 9. Fig. 9 Comparison Between Standard and Heavy-Duty Condenser The quality of insulation in a condenser is checked on a scale reading in megohms (a megohm is one million ohms). When all moisture is eliminated in assembly and windings are hermetically sealed, insulating quality or dielectric strength of insulation  between  foil  sheets  will  be  high.    If  moisture  is present in a condenser, insulation is low and may be said to be weak.  A condenser having a resistance below 2 megohms when hot will drain sufficient energy from ignition system to cause engine missing. Series  resistance  in  a  condenser  is  usually  caused  by loose or corroded connections. High series resistance causes a  condenser  to  be  slow  in  taking  a  charge  and  results  in higher  voltage  at  the  separating  contact  points.  Arcing  and rapid   wear   of   contacts   along   with   engine   missing   during starting  and  low  speed  operation  may  be  indications  of  this condition. Capacity of most ignition condensers used on IH trucks is  approximately  .20  microfarads.  This  value  is  controlled  by the    area    and    closeness    of    the    foil    sheets.        Standard condensers have two sheets of insulation assembled between foils, making a short container possible. Heavy-duty condensers have three sheets of insulation between foils and because of the greater foil area required, are housed in longer containers. CONDENSER TESTS To   test   an   ignition   condenser,   a   special   condenser tester   must   be   used,   Fig.   10.      Such   a   tester   will   check condenser for insulation breakdown, low insulation resistance, high  series  resistance  and  capacity.    All  four  of  these  are characteristics which affect ignition performance. Fig. 10  Condenser Tester CTS-2013-E  Page 7 PRINTED IN UNITED STATES OF AMERICA

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