Thermo Products MHA1-125N, MDA1-50N, MHA1-75N, MHA1-100N, MHA1-50N Packaging, Shipping Damage

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

Notice to the Installer

Installation of this gas-fired furnace must be performed by a qualified installer in accordance with all local codes and authorities having jurisdiction. In the absence of local governing codes, installation shall conform to these instructions and to the regulations of the National Fuel Gas Code, ANSI Z223.1/NFPA 54-2002 and/or, National Gas and Propane Installation Codes CSA B149.1, or the latest editions thereof.

A qualified installer, also referred to in this instruction manual as a “qualified heating contractor”, is an individual, or agency, that is responsible for the installation and adjustment of the equipment. A qualified installer is properly licensed and experienced to install gas-burning equipment in accordance with all local codes and ordinances.

Any reference to L.P. or propane gas in this manual, any other label, or markings on the furnace is to be construed to be propane HD-5, a commercial grade of liquefied petroleum gases composed of a minimum of 90 percent liquid propane (C3H8).

Material and Workmanship

This furnace was built with the highest quality materials and attention to workmanship. However, omissions and defects occasionally occur. Before installing the furnace, inspect the furnace thoroughly. If missing parts, defective material, or poor workmanship are evident, report the model and serial numbers imprinted on the furnace rating label to the seller.

Packaging

This is a complete, factory-assembled furnace contained within one package. However, certain parts, including, air filter(s), air filter rack(s), the venting system must be assembled to the furnace, in the field.

Shipping Damage

If this furnace was damaged during transit, please immediately request the transportation company inspect the furnace and issue a concealed damage report. The party receiving the furnace should file the claim for shipping damage. Report any shipping damage immediately.

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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 InstallationStandard Clearances Refer to FigureNon-combustible Material 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 Replacement Filter Maintenance ProcedureReturn 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