Laars NeoTherm NTH Installation And Operation Instructions Manual

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Laars NeoTherm NTH Installation And Operation Instructions Manual Manual pdf 46 page image

LAARS Heating SystemsPage 46SECTION 11.MaintenanceWARNINGDisconnect all power to the appliance beforeattempting any service to the appliance. Contact withelectricity can result in severe injury or death.11.1 System Maintenance(yearly, unless otherwise noted)1. 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 clean thescreens in the vent terminal and combustion airterminal (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.6. Low water cutoffs, if installed, should be checkedevery year. Float type low water cutoffs should beflushed periodically.7. Inspect and clean the condensate collection, floatswitch and disposal system yearly.8. When a means is provided to neutralizecondensate, ensure that the condensate is beingneutralized properly.9. Inspect flue passages, and clean with brushes/vacuums, if necessary. Sooting in flue passagesindicates improper combustion. Determine thecause and correct.10. Inspect the vent system and air intake system, andensure that all joints are sealed properly. If jointsneed to be resealed, completely remove existingsealing material, and clean with alcohol. Applynew sealing material, and reassemble.11.2 Appliance Maintenance andComponent DescriptionUse only genuine LAARS replacement parts.CautionLabel all wires prior to disconnection when servicingcontrols. Wiring errors can cause improper and danger-ous operation. Verify proper operation after servicing.NeoTherm gas and electric controls are engineeredfor long life and dependable operation, but the safety ofequipment depends on their proper functioning. Only aqualified service technician should inspect the basicitems listed below every year:a. Appliance control f. Flow switchb. Automatic gas valve g. Low water cutoffc. Pressure switches h. Burnerd. Blower i. Heat exchangere. Pump11.2.1 BurnerCheck the burner for debris. Remove the blowerarm assembly to access the burner. Remove the 4 boltsconnecting the blower to the arm (see Figure 34).Remove the 5 bolts, which hold the burner arm in place.Pull burner up and out. Clean burner, if necessary, byblowing compressed air from the outside of the burnerinto the center of the burner, and wipe the inside of theburner clean with glass cleaner. A dirty burner may bean indication of improper combustion or dirtycombustion air. Determine the cause, and correct. Ifdamaged, replace the burner gasket when replacing theburner.NOTE: When installing the burner, make sure theflange is aligned with the mating surface, as each iskeyed to control fit.11.2.2 Modulating Gas Valve / VenturiThe modulating gas valve consists of a valve bodythat incorporates the ON/OFF gas flow control and anegative pressure regulator. It provides the air/gas ratiocontrol in combination with the venturi to the unit. It isdesigned to operate with gas supply pressure between 4and 13 inches w.c.. To remove the gas valve and orventuri, shut off the 120 Volt power supply to theboiler. Turn off all manual gas valves connecting theboiler to the main gas supply line. Remove the frontdoor of the boiler to gain access to the gas valve andventuri. Disconnect the four (4) flange bolts connectingthe gas manifold pipe to the gas valve. Remove theelectrical connections to the gas valve. Remove the boltsconnecting the venturi flange to the blower. This allowsthe entire gas valve/venturi assembly to be removed asan assembly to facilitate inspection and cleaning.After the valve has been removed, reassemble inreverse order making sure to include all gaskets and O-rings. Turn on the manual gas valves and check for gasleaks. Turn on the 120 Volt power. Place the unit inoperation following the instructions in Section10. Oncethe boiler is operating check for leaks again and confirmall fasteners are tight.Check appliance setup according to Section 10.11.2.3 Appliance ControlNeoTherm has an integrated control thatincorporates manual reset high limit control, operatingtemperature control, modulating control, ignitioncontrol, outdoor reset control, pump control and manyother features. If any of these features are thought to bedefective, please consult the factory for proper troubleshooting practices prior to replacing the control. Ifcontrol replacement is required, turn off all power to theappliance and shut off all manual gas valves to the