Thermo Products MDA1-125N, MDA1-50N, MHA1-75N, MHA1-100N, MHA1-50N, MHA1-125N, MDA1-75N, MDA1-100N

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All installations and services must be performed by qualified service personnel.

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Contents Induced Draft Highboy COUNTERFLOW/HORIZONTAL GAS Furnace Section Safety II. Installation Guidelines Page Packaging Shipping DamageSafety II. Installation Guidelines CodesInstallation Location Closet and Alcove InstallationNon-combustible Material Standard ClearancesRefer to Figure Plenum Flue or Vent All Models Covered by This ManualAir for Combustion and Ventilation MDA1 Horizontal Installation MDA1 Installed Horizontal Filters/ Filter Installation Duct Work and Air ConditioningUse of Non-Thermo Pride Filter Retention Means Optional Thermo Pride Filter RackFPM FormulaVenting Replacing An Existing Furnace From a Common Vent Carbon Monoxide Poisoning HazardCondensing in the Chimney Page Page Vent Connection to Inducer Inducer Mounting Sidewall Venting Automated Literature FAXHorizontal Size and Lengths for Horizontal Vents Horizontal Size and Length for Sidewall VentingGAS Piping General GAS Piping Fire or Explosion HazardPage Installation of Natural GAS Piping Typical Gas PipingInstallation of Propane GAS Piping Steel Pipe Size for Natural Gas IPSPage Field Wiring and Replacing Wiring ElectricalElectronic Air Cleaner and Humidifier Connections Room ThermostatBlower and Control Panel To delay fan Set Switch Initial StartupWhat to do if YOU Smell GAS To Turn Off Gas To Appliance Adjustment Of Heat Input Rate Page Burner Adjustment Setting Supply Air Temperature Rise Typical Observation of Main Burner FlamesCheckout Procedure Important Remove flue blockage when doneDiagnostic Features LED will also flash once at power-upShut off gas and disconnect power before continuing General InspectionHouse Air Blower Filter Maintenance Procedure Filter ReplacementReturn Air Filter VI. Installers Instructions to User Appendix a Sources for Reference Standards Appendix B Sequence of Operations Sequence of Operations for Heating SystemMode of Operation Control System Action Appendix C Troubleshooting Flowcharts Heating SystemYes Is ignitor positioned Correctly? Does system run until thermostat is satisfied? MDA1/MHA1-50S00S4426 Description Part Number QTYAppendix E Replacement Parts List MHA1 Page Replacement Parts List MDA1 Page Appendix F Wiring Diagram Page Appendix G MID-EFFICENCY Furnace Specifications MID-EFFICIENCY Highboy GAS Furnace SPECIFICATIONS5Nominal temp. rise Heating fan speed