L.B. White Therma Grow Greenhouse HW220 Owner's Manual And Instructions
Also see for Therma Grow HW220: Owner's manual and instructionsOwner's manual and instructionsOwner's manual and instructions
                                | |
Troubleshooting InstructionsREAD THIS ENTIRE SECTION BEFORE BEGINNING TOTROUBLESHOOT 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 voltage and resistance.• Low Pressure Gauge - for checking inlet and outletpressures at the gas control valve against dataplate rating.INITIAL PREPARATION■ Visually inspect equipment for apparent damage.■ Check all wiring for loose connections and worninsulation.The ignition control module is self-diagnostic. The red lightlocated on the control will flash a specific pattern dependingupon the problem which is diagnosed. To use the flow charts, tidentify the problem by the light pattern of the L.E.D. (lightemitting code) diagnostic light. If the light is flashing, the flashpattern will be followed by a pause and then a repeat of theflash pattern until the problem is corrected. The light will onlybe on when the selector switch is positioned to HEAT and thethermostat or controller is calling for heat. The light will not beon when the selector switch is positioned to VENT.Heating Mode Problems PageL.E.D. light is not on during a call for heat. . . . . . . . . . . . . . . 21L.E.D. diagnostic light is flashing:A. Rapid flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22B. Long flash ( 2 seconds on-2 seconds off) . . . 22C. One time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22D. Two times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23E. Three times . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24F. Four times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25G.Five times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25H.Six times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Ventilation Mode Problems PageA. Motor Does Not Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25B. Motor Hums, Does Not Run . . . . . . . . . . . . . . . . . . . . . . . 25OPERATION SEQUENCE:-- Line voltage is sent to selector switch.-- Selector switch is positioned to HEAT.-- Line voltage is sent to motor relay and transformer-- Terminal at transformer branches off line voltage to . .terminal L1 on ignition control.-- Transformer reduces line voltage to 24 VAC.-- 24 VAC is sent to thermostat.-- Thermostat closes and returns 24 volts to terminal W onignition control.-- Red light on ignition control is illuminated.-- Ignition control sends flame sense current to flame sensor.-- Ignition control module performs self safety check.-- Internal components are tested.-- Air proving circuit is tested-- Control sends 24 VAC from terminal PSI to air provingswitch.-- Ignition control module begins ignition trial sequence.-- Ignition control sends 115 volts from terminal IND to motorrelay.-- Motor relay closes.-- Line voltage is sent to motor-- Motor starts.-- Air proving switch closes and 24 volts are returned toterminal PSO of ignition control.-- Motor stops.-- Ignition control module sends 115 volts to hot surface igniter.-- Igniter reaches ignition temperature in 17 seconds.-- Ignition control restarts the fan motor while sending 24 VACto air proving switch.-- Switch closes and 24 volts are returned back to control.-- Ignition control send 24 volts from terminal GV to high limitswitch.-- If limit switch contacts are closed, limit sends 24 voltsto gas control valve-- Gas control valve opens-- Ignition occurs.-- Flame sense current is passed through burner flame back toignition control.-- Igniter stays powered until ignition control proves flame sense-- Igniter then shuts down.-- Gas control valve stays open-- Room warms to desired temperature.-- Thermostat is satisfied.-- Heater shuts down.-- Process starts again on a call for heat.IGNITION TRIAL SEQUENCE:-- First trial for ignition takes approximately 30 seconds-- Two more ignition trials occur-- Second trial immediatley follows if first trial failed.-- If second trial fails-- Ignition control starts a 15 minute waiting period-- Allows the ignition interruption to pass-- At end of 15 minutes-- Ignition control attempts third and final ignition trial-- If igntion control does not prove burner flame after thirdtrial, the control goes into safety lockout ( 3 flash)-- Gas valve closes.-- Hot surface igniter shuts down-- Fan motor stops.-- To retry for ignition, turn the heater off and then on.WARNING■ This heater can start at any time.■ Troubleshooting this system may require operating theunit with line voltage present and gas on. Use extremecaution when working on the heater.■ Failure to follow this warning may result in personalinjury or death.20 |
Related manuals for L.B. White Therma Grow HW220
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine