Raypak RAYTHERM 133-4001 Installation & Operating Instructions Manual

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Raypak RAYTHERM 133-4001 Installation & Operating Instructions Manual Manual pdf 36 page image

36MECHANICAL PROBLEMWhen boiler is turned on nothinghappens.Thermostat in "ON" position causesrelay and pump to operate, but boilerdoes not fire.Continuous shut down of manual resethigh limit.SootingCAUTION-Soot may be combustible.Wet down and exercise caution whencleaning.Continuous shut down of low water cut-off or flow switch.Low flame.Outer jacket very hot (blistered paint).POSSIBLE CAUSEPilot is not lit………………………………No power to the boiler…………………...Bad transformer………………………….Inoperative thermostat…………………..Inoperative toggle switch………………..Inoperative relay………………………….Main gas valve is closed……………….Plugged bleed line on gas valve orgas pressure regulator…………………..Broken pump coupler……………………Shutdown by low water cut-off,caused by air……………………………..Gas valve defective………………………Temperature setting too low…………….Low water flow……………………………Interrupted pump operation……………..Modulating control set too high………..Mechanical modulating control…………Air starvation……………………………..Condensation……………………………..Toxic fumes which cause a chemicalreaction with copper tubes or destroycombustion……………………………….Improper venting…………………………Insufficient system flow………………….Low water due to leaking………………..Air in system………………………………Line strainer dirty…………………………Lime in heat exchanger…………………Gas supply………………………………..Insects or debris clogging burners..........Burner intake ports low gas pressure….Venting or combustion air……………….Broken refractory…..…………………….CORRECTIVE ACTIONLight pilot. (Standing pilot models)Check the circuit breaker, outdoor con-troller, etc., upstream of boiler.If power to Leads L1 and L2 of trans-former, but no power on 24V side, re-place.Jumper thermostat. Replace with new ifboiler fires.If power to toggle switch, but notthrough switch, replace.If power to relay, but not operating,replace.Open valve.Loosen bleed line and clean.Replace coupler. Inspect bearing as-sembly, and if frozen, lubricate or re-place.Bleed air from system.Check for power to gas valve. If valvehas power but will not open, check venttube for blockage. If clear, replacevalve.Reset high limit to higher temperature.Check system water pumps.Check pump oil if necessary.Reset modulator to a lower setting.Check and replace if necessary.Refer to installation instructions regard-ing combustion air requirements.Set bypass valve to prevent boiler inlettemperature from dropping below105 °F.Remove all sources of fumes, such asfreon, chloride, or isolate the boiler.Follow recommended vent installationinstructions.Check pumps and piping.Inspect for leakage and repair.Inspect for leakage and repair. Installan automatic air vent.Clean.Ream tubes.Debris in gas line (pipe dope, rocks,etc.). Gas line too small.Improperly sized gas meter.Gas regulator adjustment.Clean burners.Adjust gas pressure.Refer to installation instructions regard-ing combustion air requirement.Replace refractory panels.