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

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

It is absolutely essential that a damage report be obtained. If a concealed damage report is not obtained, we cannot provide assistance in recovering your claim against the transportation company.

Warranties

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The manufacturer of this equipment assumes no liability for any damages resulting from unauthorized modifications made to the furnace, or components thereof, or improper installation of the furnace in the field. Furthermore, any such field modifications VOID THE WARRANTY and place the responsibility for safe and reliable operation of the furnace on those who performed the modification(s).

Make certain the warranty cards are returned. These must be on file to verify installation dates for replacement of any warranted part(s).

I. Safety

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The following guidelines and warnings should be read and understood before continuing with the installation of this furnace. Failure to follow these guidelines can result in improper and unsafe operation of this appliance, which can cause substantial property damage, severe personal injury, or death.

These instructions must be read in their entirety before installing the furnace. It is the installer's responsibility to do the following:

1.Use only with the type of gas approved for this furnace. Refer to the furnace marking plate.

2.Install this furnace only in a location and position as specified in Section II, B of this manual.

3.Provide adequate combustion and ventilation air to the furnace space. Refer to Sections II, E of this manual.

4.Connect this furnace to an approved vent system only. Combustion products must be vented outdoors. Refer to Section II, J of this manual for vertical vented units.

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Contents Induced Draft Highboy COUNTERFLOW/HORIZONTAL GAS Furnace Section Safety II. Installation Guidelines Page Shipping Damage PackagingSafety Codes II. Installation GuidelinesCloset and Alcove Installation Installation LocationRefer to Figure Standard ClearancesNon-combustible Material Plenum Flue or Vent All Models Covered by This ManualAir for Combustion and Ventilation MDA1 Horizontal Installation MDA1 Installed Horizontal Duct Work and Air Conditioning Filters/ Filter InstallationOptional Thermo Pride Filter Rack Use of Non-Thermo Pride Filter Retention MeansFormula FPMVenting Carbon Monoxide Poisoning Hazard Replacing An Existing Furnace From a Common VentCondensing in the Chimney Page Page Vent Connection to Inducer Inducer Mounting Automated Literature FAX Sidewall VentingHorizontal Size and Length for Sidewall Venting Horizontal Size and Lengths for Horizontal VentsGeneral GAS Piping Fire or Explosion Hazard GAS PipingPage Typical Gas Piping Installation of Natural GAS PipingSteel Pipe Size for Natural Gas IPS Installation of Propane GAS PipingPage Electrical Field Wiring and Replacing WiringRoom Thermostat Electronic Air Cleaner and Humidifier ConnectionsBlower and Control Panel Initial Startup To delay fan Set SwitchWhat to do if YOU Smell GAS To Turn Off Gas To Appliance Adjustment Of Heat Input Rate Page Burner Adjustment Typical Observation of Main Burner Flames Setting Supply Air Temperature RiseImportant Remove flue blockage when done Checkout ProcedureLED will also flash once at power-up Diagnostic FeaturesGeneral Inspection Shut off gas and disconnect power before continuingHouse Air Blower Return Air Filter Filter Maintenance ProcedureFilter Replacement VI. Installers Instructions to User Appendix a Sources for Reference Standards Sequence of Operations for Heating System Appendix B Sequence of OperationsMode of Operation Control System Action Heating System Appendix C Troubleshooting FlowchartsYes Is ignitor positioned Correctly? Does system run until thermostat is satisfied? Description Part Number QTY MDA1/MHA1-50S00S4426Appendix E Replacement Parts List MHA1 Page Replacement Parts List MDA1 Page Appendix F Wiring Diagram Page MID-EFFICIENCY Highboy GAS Furnace SPECIFICATIONS5 Appendix G MID-EFFICENCY Furnace SpecificationsNominal temp. rise Heating fan speed