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Furnace
Thermo Products
MHA1-100N, MDA1-50N, MHA1-75N, MHA1-50N, MHA1-125N, MDA1-75N, MDA1-125N, MDA1-100N
Models:
MDA1-100N
MDA1-125N
MDA1-75N
MHA1-125N
MHA1-50N
MHA1-100N
MHA1-75N
MDA1-50N
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Install
Parts list
Appendix F Wiring Diagram
To delay fan Set Switch
Maintenance
Diagnostic Features
Checkout Procedure
Adjustment Of Heat Input Rate
Safety
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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 Damage
Safety
II. Installation Guidelines
Codes
Installation Location
Closet and Alcove Installation
Non-combustible Material
Standard Clearances
Refer to Figure
Plenum Flue or Vent All Models Covered by This Manual
Air for Combustion and Ventilation
MDA1 Horizontal Installation
MDA1 Installed Horizontal
Filters/ Filter Installation
Duct Work and Air Conditioning
Use of Non-Thermo Pride Filter Retention Means
Optional Thermo Pride Filter Rack
FPM
Formula
Venting
Replacing An Existing Furnace From a Common Vent
Carbon Monoxide Poisoning Hazard
Condensing in the Chimney
Page
Page
Vent Connection to Inducer
Inducer Mounting
Sidewall Venting
Automated Literature FAX
Horizontal Size and Lengths for Horizontal Vents
Horizontal Size and Length for Sidewall Venting
GAS Piping
General GAS Piping Fire or Explosion Hazard
Page
Installation of Natural GAS Piping
Typical Gas Piping
Installation of Propane GAS Piping
Steel Pipe Size for Natural Gas IPS
Page
Field Wiring and Replacing Wiring
Electrical
Electronic Air Cleaner and Humidifier Connections
Room Thermostat
Blower and Control Panel
To delay fan Set Switch
Initial Startup
What 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 Flames
Checkout Procedure
Important Remove flue blockage when done
Diagnostic Features
LED will also flash once at power-up
Shut off gas and disconnect power before continuing
General Inspection
House Air Blower
Filter Replacement
Filter Maintenance Procedure
Return Air Filter
VI. Installers Instructions to User
Appendix a Sources for Reference Standards
Appendix B Sequence of Operations
Sequence of Operations for Heating System
Mode of Operation Control System Action
Appendix C Troubleshooting Flowcharts
Heating System
Yes
Is ignitor positioned Correctly?
Does system run until thermostat is satisfied?
MDA1/MHA1-50S00S4426
Description Part Number QTY
Appendix 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 SPECIFICATIONS5
Nominal temp. rise Heating fan speed
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