Laars NTH1000 Installation And Operation Instructions Manual

Also see for NTH1000: User manual User manual Installation and operation instructions

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Laars NTH1000 Installation And Operation Instructions Manual Manual pdf 94 page image

LAARS Heating SystemsPage 90Section 11MAINTENANCEWARNINGDisconnect all power to the unit before attemptingany service procedures. Contact with electricitycan result in severe injury or death.11.1 System MaintenanceDo the following once a year:1. Lubricate the System pump, if required, per theinstructions on the pump.2. Inspect the venting system for obstruction orleakage. Periodically clean the screens in thevent terminal and combustion air terminal(when used).3. Keep the area around the unit clear and freeof combustible materials, gasoline, or otherflammable vapors or liquids.4. If the unit is not going to be used for extendedperiods in locations where freezing normallyoccurs, it should be isolated from the systemand completely drained of all water.5. Low water cutoffs, if installed, should bechecked every year. Float type low watercutoffs should be flushed periodically.6. Inspect and clean the condensate collection,float switch and disposal system yearly.7. When a means is provided to neutralizecondensate, ensure that the condensate is beingneutralized properly.8. 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 correctit.9. Inspect the vent system and air intake system,and ensure that all joints are sealed properly.If any joints need to be resealed, completelyremove the existing sealing material, and cleanwith alcohol. Apply new sealing material, andreassemble.10. Once a year, the items listed below should beinspected by a qualified service technician:a. Appliance control f. Flow switchb. Automatic gas valve g. Low water cutoffc. Pressure switches h. Burnerd. Blower i. Heat exchangere. PumpDo the following once every six months:1. If a strainer is employed in a pressure reducingvalve or the piping, clean it every six months.11.2 Maintenance NotesUse only genuine LAARS replacement parts.CautionWhen servicing the controls, label all wires beforedisconnecting them. Wiring errors can cause improp-er and dangerous operation. Verify proper operationafter servicing.The gas and electric controls in the NeoThermLC are engineered for long life and dependableoperation, but the safety of the equipment dependson their proper functioning.11.2.1 BurnerCheck the burner for debris. Remove the blowerarm assembly to access the burner. Remove the 4bolts connecting the blower to the arm. (See Figure34). Remove the 5 bolts which hold the burnerarm in place. Pull the burner up and out. Clean theburner, if necessary, by blowing compressed airfrom the outside of the burner into the center of theburner, and wipe the inside of the burner clean withglass cleaner. A dirty burner may be an indicationof improper combustion or dirty combustion air.Determine the cause of the problem, and correctit. If the burner gasket is damaged, replace it whenreplacing the burner.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 anda negative pressure regulator. It provides the air/gas ratio control in combination with the Venturi tothe unit. It is designed to operate with gas supplypressure between 4 and 13 inches w.c.. To removethe gas valve and or Venturi, shut off the 120 Volt