ENGINEMAN  1  &  C Trouble Possible  Cause Corrective   Measure High condensing pressure. Air  or  non-condensable  gas in  system. Purge  air  from  condenser. Inlet  water  warm. Increase  quantity  of  con- densing  water. Insufficient water flowing through condenser. Increase  quantity  of  water. Condenser  tubes  clogged  or scaled. Clean  condenser  water  tubes. Too  much  liquid  in  receiver, condenser  tubes  submerged in   liquid   refrigerant. Draw  off  liquid  into  service cylinder. Low  condensing  pressure. Too much water flowing through condenser. Reduce quantity of water. Water  too  cold. Reduce  quantity  of  water. Liquid  refrigerant  flooding back  from  evaporator. Change  expansion  valve adjustment,   examine fastening  of  thermal  bulb. Leaky  discharge  valve. Remove  head,  examine  valves. Replace any found defective. High  suction  pressure. Overfeeding of expansion valve. Leaky  suction  valve. Regulate expansion valve, check  bulb  attachment. Remove  head,  examine  valve and  replace  if  worn. Low  suction  pressure. Restricted  liquid  line  and expansion  valve  or  suction screens. Pump  down,  remove,  examine and  clean  screens. Insufficient   refrigerant   in Check  refrigerant  charge system. Too  much  oil  circulating in  system. Check  for  too  much  oil  in circulation.  Remove  oil. Improper  adjustment  of expansion valves. Adjust  valve  to  give  more flow. Expansion valve power element  dead  or  weak. Replace expansion valve power  element. Figure  6-12.—Trouble  diagnosis  chart. 6-18 54.299.1