Laars Pennant PNCH Installation And Operation Instructions Manual

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Laars Pennant PNCH Installation And Operation Instructions Manual Manual pdf 48 page image

LAARS Heating SystemsPage 48SECTION 7.Maintenance7.1 System Maintenance1. Lubricate the system water-circulating pump, ifrequired, per the instructions on the pump.2. If a strainer is employed in a pressure reducingvalve or the piping, clean it every six months.3. Inspect the venting system for obstruction orleakage at least once a year. Periodically cleanthe screens in the vent terminal and combustionair terminal (when used).4. Keep the appliance area clear and free fromcombustible materials, gasoline, and otherflammable vapors and liquids.5. If the appliance is not going to be used forextended periods in locations where freezingnormally occurs, it should be isolated from thesystem and completely drained of all water. Allsystems connected to it should also be drained orprotected from freezing.6. Low water cutoffs, if installed, should bechecked every 6 months. Float type low watercutoff should be flushed periodically.7. Inspect flue passages, and clean with brushes/vacuums, if necessary. Sooting in flue passagesindicates improper combustion. Determine thecause and correct.8. Inspect the vent system and air intake system,and if the vent system is Category III, ensure thatall joints are sealed properly. If joints need to beresealed, completely remove existing sealingmaterial, and clean with alcohol. Apply newsealing material, and re-assemble.7.2 Appliance Maintenance andComponent DescriptionOnly genuine Laars replacement parts should be used.CautionLabel all wires prior to disconnection when servicingcontrols. Wiring errors can cause improper anddangerous operation. Verify proper operation afterservicing.See Figures 31 and 32 for location of gas trainand control components.The gas and electric controls on the appliance areengineered for long life and dependable operation, butthe safety of the equipment depends on their properfunctioning. It is strongly recommended that aqualified service technician inspect the basic itemslisted below every year:a. Ignition controls d. Automatic gas valveb. Ignitors e. Pressure switchesc. Water temperature f. Blowerscontrol7.2.1 BurnersClose main manual gas valve before proceeding.Checking the burners for debris - Remove the ignitorinspection panels(s) and ignitor(s) and inspect theburners through the ignitor hole(s) using a flashlight toilluminate. If there is any indication of debris on theburners that are visible, all the burners will need to beinspected more thoroughly. Remove the screws fromaround the front of the air box (large panel from whichthe ignitor inspection panel(s) were removed), andremove the large panel. Remove the gas manifoldassemblies and the burner panels. Inspect the burners.Clean burners, if necessary, by blowing compressedair from the outside of the burners into the center ofthe burner. A dirty burner may be an indication ofimproper combustion or dirty combustion air.Determine the cause, and correct. Replace the burnersin the reverse order7.2.2 FilterThe filter used in the Pennant is washable with an83% arrestance. Since the filter is washable, it willonly need replacement when unwashable, deterioratedor damaged. If filter replacement is needed, it shouldonly be replaced with a factory part. Inspect the airfilter. If there is debris on the air filter, remove it fromthe filter box, and wash it with mild soap and water.Ensure that the filter is completely dry before re-installing, in reverse order.7.2.3 Gas ValvesThe gas valves are designed to operate withsupply pressures of 4-13 inches w.c. (1.0 to 3.2 kPa).To remove a valve, shut off 120-volt power andthe manual gas shutoff valve. Remove the top frontpanel from the unit. Disconnect the wires to the valve.Disengage the flanged fitting before and after thevalve, and remove the valve. Re-install in reverseorder. Ensure o-rings are properly installed for bothinlet and outlet. Turn on manual gas shutoff valve and120 volt power and check appliance operation andtightness of gas valve connections.7.2.4 Manual Reset High Limit ControlThe high limit switch is manual reset switch withan adjustable set point, up to 240°F (116°C) on boilermodels and 200°F (93°C) on water heater models andboilers ordered with low temperature controls. Toreplace the switch, shut off the 120-volt power to theappliance. Remove the cover from the switch to accessthe mounting screws. Remove the screws, and pull theswitch off the control panel. Remove the capilliary andbulb from the thermal well located in the header.Replace in reverse order.7.2.5 Automatic Reset High Limit ControlAn automatic reset high limit is used in additionto the manual reset high limit. The high limit switchhas an adjustable set point, up to 240°F (116°C) onboiler models and 200°F (93°C) water heater models