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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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Troubleshooting
Specs
Install
Parts list
Appendix F Wiring Diagram
Filter Location FILTER REPLACEMENT
Maintenance
Wiring
E. Checkout Procedure
B. Adjustment Of Heat Input Rate
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All installations and services must be performed by qualified service personnel.
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Contents
INDUCED DRAFT HIGHBOY AND COUNTERFLOW/HORIZONTAL
MODELS MHA1-50N MDA1-50N MHA1-75N MDA1-75N
MHA1-100N MDA1-100N MHA1-125N MDA1-125N
GAS FURNACE
I. SAFETY
Contents
Notice to the Installer
II. INSTALLATION GUIDELINES
VI. INSTALLER’S INSTRUCTIONS TO USER
Packaging
Notice to the Installer
Material and Workmanship
Shipping Damage
I. Safety
II. Installation Guidelines
A. Codes
B. Installation Location
C. Closet and Alcove Installation
D. Standard Clearances
E. Air for Combustion and Ventilation
F. MDA1 Horizontal Installation
Figure 2 MDA1 Installed Horizontal
H. Filters/ Filter Installation
G. Duct Work and Air Conditioning
I. Use of Non-ThermoPride Filter Retention Means
Figure 3 Optional Thermo Pride Filter Rack
Table 2 Minimum Filter Area Required Sq. in
J.Venting
CARBON MONOXIDE POISONING HAZARD
3. Condensing in the Chimney
condensing within the chimney under certain conditions. The following is an explanation on why and what to do if condensing occurs in a chimney or vent
4. Flue/Vent Connector
Figure 4 Vent Connection to Inducer
Figure 5 Inducer Mounting
K. Sidewall Venting
MODEL NUMBER
L. GAS PIPING
Piping from the natural gas meter to the furnace shall be in accordance with requirements of the local utility. Piping from the propane tank to the furnace must follow the recommendations of the gas supplier
MHA1 SERIES
1. INSTALLATION OF NATURAL GAS PIPING
Figure 6 Typical Gas Piping
2.INSTALLATION OF PROPANE GAS PIPING
TABLE 4 Steel Pipe Size for Natural Gas IPS
Figure 7 Typical Piping For Two-StageRegulation
Table 5 COPPER TUBING SIZE FOR PROPANE GASES
1. Wiring
M. Electrical
2. Field Wiring and Replacing Wiring
4.Room Thermostat
5.Blower Motor Speed Wiring
Figure 8 Blower and Control Panel
III.Initial Operation of the Furnace
A.Initial Startup
For Your Safety Read Before Operating
Operating Instructions
STOP! Read the safety information above
To Turn Off Gas To Appliance
B. Adjustment Of Heat Input Rate
Range of
C. Burner Adjustment
D. Setting Supply Air Temperature Rise
E. Checkout Procedure
DIAGNOSTIC FEATURES
IV. Troubleshooting
The LED will also flash once at power-up
A.Electrical
V. Dealer Maintenance
B. General Inspection
C. House Air Blower
Filter Maintenance Procedure
D. Return Air Filter
Figure 11 Filter Location FILTER REPLACEMENT
VI. Installers Instructions to User
APPENDIX A SOURCES FOR REFERENCE STANDARDS
Standby At any time the gas
Mode of Operation
Control System Action
valve is not energized
Control System Action
Mode of Operation
Main Burner Operation
APPENDIX C TROUBLESHOOTING FLOWCHARTS
A. Heating System
Page
Yes No
Page
APPENDIX D PARTS PACKAGE COMPONENTS
APPENDIX E REPLACEMENT PARTS LIST - MHA1
Page
REPLACEMENT PARTS LIST - MDA1
Page
APPENDIX F WIRING DIAGRAM
Page
APPENDIX G MID-EFFICENCYFURNACE SPECIFICATIONS
Model NO
