L.B. White CP400 Owner's Manual And Instructions

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Contents

L.B. White CP400 Owner's Manual And Instructions Manual pdf 18 page image

READ THIS ENTIRE SECTION BEFORE BEGINNINGTO TROUBLESHOOT PROBLEMS.The following troubleshooting guide provides systematicprocedures for isolating equipment problems. This guide isintended for use by a QUALIFIED GAS HEATER SERVICEPERSON. DO NOT ATTEMPT TO SERVICE THESE HEATERSUNLESS YOU HAVE BEEN PROPERLY TRAINED.TEST EQUIPMENT REQUIREDThe following pieces of test equipment will be required totroubleshoot this system with minimal time and effort.• Digital Multimeter - for measuring AC voltage andresistance.• Low Pressure Gauge - for checking inlet and outletpressures at the gas control valve against dataplaterating.■ Inspect heater for apparent damage.■ Check all wiring for loose connections and worninsulation.Refer to the system operation sequence in this section togain an understanding as to how the equipment operatesduring a call for heat. Understanding the sequence ofoperation is important as it relates to problem solving.Heaters labeled Tradesman Ultra have a red light located atthe fan end of the heater, near the ON/OFF switch. Thelight will flash a specific pattern depending upon theproblem which is diagnosed. If the light is flashing, theflash pattern will be followed by a pause and then a repeatof the flash pattern until the problem is corrected. Use thelight to help diagnose the problem.Heater models labeled Tradesman do not have thediagnostic red light.Troubleshooting Flow Charts are provided to eliminateproblems. To use the flowcharts effectively, you must firstidentify the problem.Tradesman Ultra Diagnostic Heaters PageRed light is steady on. No flash pattern. . . . . . . . . . . . . . 18Red light light is not on. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Red light is flashing:A. One Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19B. Two Times . . . . . . . . . . . . . . . . . . . . . . . . . . . 20C. Three Times . . . . . . . . . . . . . . . . . . . . . . . . . 21D. Four Times . . . . . . . . . . . . . . . . . . . . . . . . . . 21D. Five Times. . . . . . . . . . . . . . . . . . . . . . . . . . . 21Tradesman Non - Diagnostic Heaters PageFan Does Not Run, Heater Does Not Light. . . . . . . . . . . . 22Fan Runs, Heater Does Not Light . . . . . . . . . . . . . . . . . . . 23Heater Lights, But Does Not Stay Lit. . . . . . . . . . . . . . . . . 24Components should be replaced only after each step hasbeen completed and replacement is suggested in the flowchart. Refer to the Servicing sections as necessary toobtain information on disassembly and replacementprocedures of the component once the problem is identifiedby the flow chart.DIRECT IGNITION OPERATION SEQUENCE:-- Line voltage is sent to ON/OFF Switch.-- Voltage is sent to the thermostat when switch is positionedto ON.-- Thermostat calls for heat.-- Thermostat sends 115 volts to ignition control.-- Red light is illuminated.( Diagnostic Heaters Only).-- Ignition control module performs self safety check.-- Internal components are tested.-- Air proving circuit is checked.-- Ignition control module begins ignition trial sequence.-- Ignition control module sends 115 volts to air proving .switch.-- Ignition control sends 115 volts to motor, motor starts.-- Air proving switch closes and 115 volts are returned to theignition control module.-- Ignition control module sends high voltage to the igniterelectrode.-- Igniter sparks.-- Ignition control module sends 115 volts to the gas controlvalve through the backflash switch.-- Gas control valve opens.-- Ignition occurs.-- Igniter continues to spark until flame provingoccurs.-- Ignition spark is cut off.-- Gas valve stays open.-- Room warms to desired temperature.-- Thermostat is satisfied.-- Heater shuts down.-- Process starts again on a call for heat.IGNITION FAILURE SEQUENCE:-- Trial for ignition takes approximately 10 seconds.-- If ignition module does not sense a flame within the ignitiontrial, the module goes into safety lockout (3 flash pattern.)-- Gas valve closes.-- Ignition spark shuts off.-- Fan motor stops.-- To retry for ignition, the systems must be reset:-- Turn the thermostat down and then up to call forheator unplug heater and plug it back in or-- Position selector switch to off and then back toon.17Troubleshooting InformationWARNING■ This heater can start at any time.■ Troubleshooting this system may require operating theunit with voltage present and gas on. Use extremecaution when working on the heater.■ Failure to follow this warning may result in propertydamage, personal injury or death.