ACCA Standard 4 - Capital HVAC

Air ConditioningContractors of America2800 Shirlington RoadSuite 300Arlington, VA 22206703.575.4477Fax 703.575.8107www.acca.orgACCA Standard 4Standard Number: ANSI/ACCA 4 Q M – 2013Maintenance ofResidential HVAC SystemsResidential Heating, Ventilating, andAir Conditioning (HVAC) Applicationsfor One- and Two-Family Dwelling ofThree Stories or LessACCA Standards are updatedon a five-year cycle. The datefollowing the standard numberis the year of approval releaseby the ACCA-EI StandardsTask Team. The latest copymay be purchased from theACCA online store at www.acca.org or ordered from theACCA bookstore via toll-freetelephone at 888.290.2220. 2013 ACCA The Air Conditioning Contractors of America EducationalInstitute (ACCA-EI) Standards Task Team (STT) developsstandards as an American National Standards Institute(ANSI) accredited standards developer (ASD). ACCAdevelops voluntary standards as outlined in the ACCAEssential Requirements and the ANSI Essential Requirements. ACCA standards are developed by diverse groupsof industry volunteers in a climate of openness, consensusbuilding, and lack of dominance (e.g., committee/group/team balance). Essential requirements, standard activitiesand documentation can be found in the standards portion ofthe ACCA website at www.acca.org. Questions, suggestions,and proposed revisions to this standard can be addressedto the attention of the Standards Task Team, ACCA,2800 Shirlington Road, Suite 300, Arlington, VA 22206.www.ansi.orgACCA Standard 4 10.13.indd 110/16/13 7:01 AM

MAINTENANCE TASKS –GAS FURNACEPAGE 7Checklist 5.4 Gas Furnace#Inspection TaskCabineta.Inspect cabinet, cabinet fasteners, andcabinet panels.Inspect the required clearance (e.g.,b. combustion and service) aroundcabinet.Electricalc.Inspect electrical disconnect box.d.Ensure proper equipment grounding.e.Measure and record line voltage.f.Inspect and test contactors and relays.g.Inspect electrical connections andwire.h.Inspect motor capacitors.Measure and record amperage draw toi. motor/nameplate data (FLA) asavailable.Blower Assemblyj.Determine and record airflow acrossheat exchanger.Test variable frequency drive (e.g.,ECM) for proper operation.Inspect fan belt tension. Inspect beltl.and pulleys for wear and tear.Confirm the fan blade or blowerwheel has a tight connection to them. blower motor shaft. Inspect fan forfree rotation and minimal endplay.Measure and record amp draw.Condensate RemovalInspect condensate drain piping (andn.traps) for proper operation.k.Recommended Corrective ActionsRepair or replace insulation to ensure proper operation.Replace lost fasteners as needed to ensure proper integrityand of equipment (as applicable). Seal air leaks.Record and report instances where the cabinet does notmeet requirements.Ensure electrical connections are clean and tight. Ensurefused disconnects use the proper fuse size and are notbypassed. Ensure case is intact and complete. Replace asnecessary.Tighten, correct and repair as necessary.Compare to OEM specifications or equipment nameplatedata. Notify homeowner and/or utility.Look for pitting or other signs of damage. Replacecontactors and relays demonstrating evidence of excessivecontact arcing and pitting.Ensure wire size and type match the load conditions.Tighten all loose connections, replace heat discoloredconnections, and repair or replace any damaged electricalwiring.Replace those that are bulged, split, incorrectly sized, ordo not meet OEM specifications.If outside OEM rating or specification, inspect for causeand repair as necessary.Verify all grilles, registers, and balancing dampers areopen and free of obstruction and operating properly.Adjust, clean, replace, and repair as necessary to ensure toproper airflow.Replace if necessary to ensure proper operation.Repair or replace as necessary to ensure proper operation(if applicable).Lubricate bearings as needed, only if recommended byOEM. If amp draw exceeds OEM specifications thenadjust motor speed or otherwise remedy the cause. If dueto motor failure recommend replacement of blower motor.Clean, insulate, repair, or replace as necessary.ANSI / ACCA 4 QM – 2013 (Maintenance of Residential HVAC Systems)

Page 8MAINTENANCE TASKS – GAS FURNACEGas CombustionInspect burner and flue for signs ofo.water, corrosion, and blockage.Test inducer fan motor and blowerp.assembly.Inspect heat exchanger for signs ofcorrosion, fouling, structuralq. problems (e.g., cracks, perforations,and bulges), and erratic flameoperation during blower operation.Visually inspect burners for signs ofr.contamination.s. Inspect the burner blower wheelInspect hot surface igniter for cracks(white spots when energized or checkt.cold with ohmmeter and propersupply voltage).Measure and record inlet gas pressureu.at inlet pressure tap.Measure, record, and adjust manifoldv.pressure as necessary.Inspect ceramic insulator, flamew. probe, and associated wiring for anycracks or abnormalities.x.Test main burner ignition sequenceand flame safety; verify properoperation.y.Test burners.Inspect the spark igniter andassociated wiring. Verify that sparkz.gap complies with OEMspecifications.Test inducer fan motor and bloweraa.assembly.Ensure combustion air volume orbb.provision is correct.Perform combustion analysis test.cc.Measure and record test results.Measure and record TD across thedd.heat exchanger.VentingInspect vent exhaust system (e.g.,chimney, chimney liner, flue, inletand exhaust vent) for signs ofee.improper condensation, watercorrosion, cracks, fractures, andblockages.4Identify cause and clean, repair, or replace as necessary.Correct as needed.Identify cause and clean, repair, or replace as necessary.Clean, repair or replace as necessary.Clean as needed to ensure proper operation.Replace if outside OEM’s specifications.If the inlet gas pressure is insufficient for OEM operationspecifications, contact the gas supplier.Adjust the gas valve to provide proper manifold pressure.Clean according to OEM recommended procedures.Replace as needed.Record micro-amps for comparison with OEMspecifications. If outside of OEM operational range,correct combustion problem or replace components asneeded.Fire unit and adjust air shutters (if used) for OEMspecification compliance.If cracking of ceramic insulator or deterioration of sparkelectrodes is noted, igniter assembly shall be replaced.If cracking or deterioration of ignition wiring is observed,wiring shall be replaced.Correct as needed.Ensure air volume is correct per OEM instructions andlocal code4.Adjust as needed.If TD is outside OEM’s specifications, identify cause andthen clean, repair, or replace as necessary.Clean, remove blockages, repair, or replace as necessary.Direct vent, non-direct vent, and natural draft appliances have differing code requirements for combustion air.ANSI / ACCA 4 QM – 2013 (Maintenance of Residential HVAC Systems)

MAINTENANCE TASKS –GAS FURNACEVenting (Continued)Inspect all vent connectors for rustff.discoloration, or signs of condensate.Inspect inlet and exhaust vent pipe forgg. proper support, slope, andtermination.Inspect for combustible materialshh.placed too close to vent or pipe.PAGE 9Ensure they are securely fastened. Repair or replace asnecessary.Repair or replace as necessary.Relocate to safe place or provide approved clearancereduction.ANSI / ACCA 4 QM – 2013 (Maintenance of Residential HVAC Systems)

Page 10MAINTENANCE TASKS – OIL FURNACEChecklist 5.5 Oil Furnace#Inspection TaskCabineta.Inspect cabinet, cabinet fasteners, andcabinet panels.Inspect the required clearance (e.g.,b. combustion and service) aroundcabinet.Electricalc.Inspect electrical disconnect box.d.Ensure proper equipment grounding.e.Measure and record line voltage.f.Inspect and test contactors and relays.g.Inspect electrical connections andwire.h.Inspect motor capacitors.Measure and record amperage draw tomotor/nameplate data (FLA) asavailable.Blower AssemblyRecommended Corrective ActionsRepair or replace insulation to ensure proper operation.Replace lost fasteners as needed to ensure proper integrityand fit/finish of equipment (as applicable). Seal air leaks.Record and report instances where the cabinet does notmeet the requirements.Ensure electrical connections are clean and tight. Ensurefused disconnects use the proper fuse size and are notbypassed. Ensure case is intact and complete. Replace asnecessary.Tighten, correct and repair as necessary.Compare to OEM specifications or equipment nameplatedata. Notify homeowner and/or utility.Look for pitting or other signs of damage. Replacecontactors and relays demonstrating evidence of excessivecontact arcing and pitting.Ensure wire size and type match the load conditions.Tighten all loose connections, replace heat discoloredconnections, and repair or replace any damaged electricalwiring.Replace those that are bulged, split, incorrectly sized, ordo not meet OEM specifications.i.If outside OEM rating or specification, inspect for causeand repair as necessary.j.Verify all grilles, registers, and balancing dampers areopen and free of obstruction and operating properly.Adjust, clean, replace, and repair as necessary to ensure toproper airflow.Determine and record airflow acrossheat exchanger.Test variable frequency drive (e.g.,ECM) for proper operation.Inspect fan belt tension. Inspect beltl.and pulleys for wear and tear.Confirm the fan blade or blowerwheel has a tight connection to them. blower motor shaft. Inspect fan forfree rotation and minimal endplay.Measure and record amp draw.Oil CombustionInspect combustion chamber forn. structural problems (e.g., cracks,perforations, and deformities).Inspect heat exchanger and internalflue for signs of corrosion, fouling,o.and erratic flame operation duringblower operation.k.Replace if necessary to ensure proper operation.Repair or replace as necessary to ensure proper operation(if applicable).Lubricate bearings as needed, only if recommended byOEM. If amp draw exceeds OEM specifications thenadjust motor speed or otherwise remedy the cause. If dueto motor failure recommend replacement of blower motor.Identify cause and clean, repair, or replace as necessary.Identify cause and clean, repair, or replace as necessary.ANSI / ACCA 4 QM – 2013 (Maintenance of Residential HVAC Systems)