Quantcast Evaporator   Fan   Motor   Runs-Condenser   Fan   Motor   and   Compressor   Motor   will   not   Run (Selector Switch on COOL)

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Section   IV.   OPERATOR   MAINTENANCE
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Faulty   Blower
TM   5-4120-259-15 37.   Evaporator   Fan   Motor   Runs-Condenser   Fan   Motor   and   Compressor   Motor   will   not   Run (Selector Switch on COOL) Probable Cause Possible  Remedy Circuit   breaker   open. Determine   and   correct   cause   of   overload. High   pressure   cutout. If   the   evaporator   fan   motor   runs   and   the   thermostat is   calling   for   cooling,   but   the   condenser   fan   and compressor   motors   do   not   run,   the   high   pressure cutout   has   probably   opened   and   should   be   reset at   the   dual   preassure   switch. 38.  Fan  Motor  and  Compressor  Motor  will  not  Run Probable Cause Blown   fuse   at   power   source. Defective  power  outlets,  broken  wire  or  loose terminal   connection   or   faulty   power   switch. 39.   Compressor   Noisy Probable Cause Loose    mounting    bolts. Internal   noise   in   compressor. Unit   vibrating   against   nearby   tubing   or   objects. 40.  Compressor  Will  Not  Run  Steadily Probable Cause Stopping   on   high   pressure  cut-out. 41.   Air   Output   Volume   Insufficient Probable Cause Filters   dirty. Evaporator   coils   dirty. Dirty   fan   blades. Fan(s)   running   too   slow. 42.    Insufficient    Cooling Probable Cause Insufficient   refrigerant   charge   or   faulty   compressor operation. Filters   dirty. Improper    adjustment    of    damper    control. 43.   Excessive   Cooling Probable Cause Thermostat    set    too    low. defective   thermostat. Posible Remedy Test   for   voltage   at   the   power   outlet.   No   voltage indication   usually   means   that   the   line   fuses   are defective.   If   common   fuses   have   been   used,   thay should   be   replaced   with   30   amp   time   lag   fuses such   as   Fustats   or   Fusetrons   or   40   amp   regular fuse. Check   the   power   switch   circuits   (fig.   5)   and   make necessary   repairs. Possible  Remedy Tighten   all   mounting   belts. Replace   compressor   if’   necessary   (para   98). Provide   clearance   for   unit. Possible  Remedy May   be   dirty   condenser,   faulty   high   pressure   cut-out, or   excessive   heat.   Locate   trouble   and   correct. Possible  Remedy Clean   filters   (para   55). Clean   coils. Clean   fan   blades. Check   motor.   Replace   if   necessary   (para   57   and   58). Possible  Remedy Check   refrigerant   charge,   Replace   compressor   if defective   (para   98). Clean   filters   (para   55). Adjust   damper   control. Adjust   as   necessary   (para   60). Replace    thermostat    (para    60). 15

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