installation instructions cuh heavy duty unit heater - LUCKINSlive

5100 SERIES UNIT HEATERTROUBLE SHOOTING GUIDESYMPTOMThermostat calls forheat, but heater doesnot function.Fan motor runs HOTPOSSIBLE CAUSE(S)1. Open (blown) fuse2. INCORRECT WIRING3. Thermal cut-outopen, de-energizing heaterelement and control circuit.1. Dust accumulation orexcessive dirt on motor2. Dirt accumulation3. Motor needs lubrication.CORRECTIVE ACTION1. Replace fuses, check for cause.(see Replacement Parts List for fusesize)2. CHECK WIRING CONNECTIONS3. Check for the following:--- Correct supply volts and phase--- Correct control wiring (heatercontrol must be thru thermostatcontrol wiring section only).--- Power interruption to heater duringheater operation.--- Restriction of air around heater 1-5minute fan purge after thermostat off .1. Clean fan motor and casing of greaseand oil accumulation.2. . Clean louvers and between heatingelements.3. See Maintenance.Fan motor runs, butno heat.1. Element contactor notoperating correctly .2. Element fuse blown(if fitted).1. Check wiring for open circuit. Replacecontactor if defective2. Replace fuses, check for cause.MAINTENANCECAUTION: Make certain that the power source is disconnected before attempting to service or disassemble anycomponent. If the power disconnect is out of the line of sight, lock it in the OPEN position and tag to prevent theapplication of power.ELECTRICALOnce a year inspect the control panel wiring to make certain insulation is intact and all connections are tight.Inspect all heater and relay contacts. If the contacts appear badly pitted or burned, replace the contactor / relay .CLEANINGClean the unit casing, fan and motor once a year.A dirty motor will tend to run hot and eventually will bedamaged.internally. Any rust spots on the casing should be cleaned and repainted..LUBRICATIONAll units up to 15KW have fan motors that are permanently lubricated so that only occasional cleaning isrequired. Units above 15 KW have fan motors lubricated for 5 years of continuous duty of 10 years ofintermittent operations. When required, remove the oil access on plug back of heater at motor intake grill, openoil cap, fill with S.A.E. No.10 electric motor oil, replace plugs and access plug.Page 6