TM 5-3895-374-24-1 GP255FH TURBO BLOWER TROUBLESHOOTING CHECKLIST Symptom Cause Correction 1.   Motor Will Not A. Open Circuited -Check Continuity Of Start Wiring B. One Phase Not Con- -Check Continuity Of nected (Motor Hums but Wiring Doesn’t Turn) -Check For Open Breakers or Blown Fuses -Check Proper Terminal Wiring C. Motor Burned Out -Check Last Known Operating Load For Possible Overload Conditions -Check Ambient Operating Conditions 2.   Motor Blows Fuses A. Grounded Internal -Replace Motor When Starting Is Winding Attempted B. Improper Terminal -Rewire Wiring 3.   Motor Operates A High Ambient -Class B Insulation Rated Very Hot Temperature For Maximum Service At 1040 F Ambient B. Motor Running Over- -Check For Excessive Leaks loaded In The System or Blower -Check Design Capacity Against System Rating C. Improper Voltage Applied -Check Voltage Against To Terminals or Improperly Rating Wired -Check Wiring Connections D. Interference Between the -Replace Motor Rotor and Stator E Short Circuited Windings -Replace Motor In Motor 4.   Generated Pressure A. Improperly Located -Check For Improper Location Lower Than Rated Pressure Gauge Location Downstream Of Elbows, Value Butterfly Valves, etc. B. Blower Operating Above -Check For Excessive Leaks In Design Capacity (Motor The System or Blower Overloaded) -Check Design Capacity Against System Rating -Check For Missing Orifice Plates -Check Burner Discharge For   Areas Opened By Excessive Heat C. Impeller Running Back- -Rewire Motor to Reverse wards Rotation D. Impeller Running Correctly -Replace Impeller With One For but Built For Wrong Dir- Proper Direction of Rotation ection of Rotation GP325FA HAUCK MANUFACTURING CO., P. O. Box 90, Lebanon, PA 17042 717-272-3051 Fax 717-273-9882  Telex 671-1457 (page 3-549)