Laars MagnaTherm HTD Series Installation And Operation Instructions Manual

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Laars MagnaTherm HTD Series Installation And Operation Instructions Manual Manual pdf 119 page image

Page 115HTDSECTION 11 Maintenancea. The units controlsb. Automatic gas valvec. Air filterd. Pressure switchese. Blowerf. Pumpg. Flow switchh. Low water cutoffi. Burnerj. Heat exchangerk. IgnitorDo the following once every six (6) months:1. If a strainer is employed in a pressure reducingvalve or the piping, clean it every six months.11.A System MaintenanceDo the following once a year:1. Lubricate all the pumps in the system, per theinstructions on the pump.2. Inspect the venting system for obstruction orleakage. Periodically clean the screens in the ventterminal and combustion air terminal (when used).3. Remove and inspect the air filter. Clean with soapywater if needed. Be sure that filter is dry before re-inserting back into air filter box. Replace air filter ifdamaged.4. Keep the area around the unit clear and freeof combustible materials, gasoline, or otherflammable vapors or liquids.5. If the unit is not going to be used for extendedperiods in locations where freezing normallyoccurs, it should be isolated from the system andcompletely drained of all water.6. Low water cutoffs should be cleaned and inspectedannually.7. Inspect and clean the condensate collection, floatswitch and disposal system yearly.8. Ensure that the condensate is being neutralizedproperly.9. Inspect the flue passages and clean them usingbrushes or vacuums, if necessary. Sooting influe passages indicates improper combustion.Determine the cause of the problem and correct it.10. Inspect the vent system and air intake systemand ensure that all joints are sealed properly. Ifany joints need to be resealed, follow ventingmanufacturer’s instructions to clean and resealvent system.11. The pressure relief valve should be inspected andtested every year.12. Once a year, the items listed below should beinspected by a qualified service technician:11.B Maintenance NotesUse only genuine manufacturers replacement parts.CAUTIONWhen servicing the controls, label all wires beforedisconnecting them. Wiring errors can cause improperand dangerous operation. Verify proper operationafter servicing.WARNINGDisconnect all power to the unit before attempting anyservice procedures. Contact with electricity can resultin severe injury or death.The gas and electric controls are engineered for longlife and dependable operation, but the safety of theequipment depends on their proper functioning.11.B.1 BurnerCheck the burner for debris. Remove the blowerassembly to access the blower adapter plate. Removethe 4 bolts connecting the blower to the arm. Removethe blower adapter plate to access the burner. Pull theburner up and out. Clean the burner, if necessary, byblowing compressed air from the outside of the burnerinto the center of the burner, and wipe the inside ofthe burner clean with glass cleaner. A dirty burnermay be an indication of improper combustion or dirtycombustion air. Determine the cause of the problem andcorrect it. If the burner gaskets are damaged, replacethem when replacing the burner.11.B.2 Gas Train ComponentsThe air/gas train consists of an on/off solenoid valve, on/off pressure regulating valve, fuel modulating damper,air modulating damper and air/gas mixer. Pipe unionsare included to facilitate removal of the piping assembly,in the event, that a component needs to be replaced.In general, the components contain threaded pipeconnections and can be removed using standard gasplumbing practices. Before removing components, shutoff the power and gas supplies to the boiler.The air and fuel dampers must be replaced as completeassemblies. Replacement of only the actuator, in theevent of actuator failure is prohibited. The cables forthe actuator must be disconnected at the main controlpanel, X54 and X53 at the Siemens LMV36 controller.The cables cannot be disconnected at the actuator.Care must be exercised in removing the cables fromthe existing wire bundles and once new dampers areinstalled the cables should be properly coiled and