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Thermo Pride MHA1-50N Installation And Service Manual

Induced draft highboy and counterflow/horizontal gas furnace
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P/N: MG-1008 (Printed Instruction Manual)
Note: This page is not to be included as part of printed hard copy.
Overall Specifications:
Material: white plain paper
Printed text: black
Binder: staple upper left corner
Individual page specifications:
Cover page: printed single-side up
Table of contents page: printed single-side up
Warranty page: printed single-side down (facing out as last page of manual)
The balance of instruction manual pages to be printed utilizing both front and back side of paper.

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Summary of Contents for Thermo Pride MHA1-50N

  • Page 1 P/N: MG-1008 (Printed Instruction Manual) Note: This page is not to be included as part of printed hard copy. Overall Specifications: Material: white plain paper Printed text: black Binder: staple upper left corner Individual page specifications: Cover page: printed single-side up Table of contents page: printed single-side up Warranty page: printed single-side down (facing out as last page of manual) The balance of instruction manual pages to be printed utilizing both front and back side of paper.

  • Page 2: Gas Furnace

    INDUCED DRAFT HIGHBOY AND COUNTERFLOW/HORIZONTAL GAS FURNACE INSTALLATION AND SERVICE MANUAL MODELS MHA1-50N MDA1-50N MHA1-75N MDA1-75N MHA1-100N MDA1-100N MHA1-125N MDA1-125N : IF YOU DO NOT FOLLOW THE SAFETY PRECAUTIONS BELOW AND IN THIS MANUAL, A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF LIFE.

  • Page 3: Table Of Contents

    F. MDA1 Horizontal Installation ................7 G. Duct Work and Air Conditioning ..............9 H. Filter/Filter Installation ..................9 I. Use of Non Thermo Pride Filter Retention Means........10 J. Venting ......................12 1. Vertical Venting ..................12 2. Replacing an Existing Furnace from a Common........13 3.
  • Page 4 All installations and services must be performed by qualified service personnel. VI. INSTALLER’S INSTRUCTIONS TO USER ............41 APPENDIX A: SOURCES FOR REFERENCED STANDARDS .......42 APPENDIX B: SEQUENCE OF OPERATION ..........43 APPENDIX C: TROUBLESHOOTING FLOWCHART ........45 APPENDIX D: PARTS PACKAGE COMPONENTS .........49 APPENDIX E: REPLACEMENT PARTS LIST..........50 APPENDIX F: ELECTRICAL DIAGRAMS ............54 WARRANTY ......................59...

  • Page 5: Notice To The Installer

    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...

  • Page 6: Safety

    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 The manufacturer of this equipment assumes no liability for any damages resulting from unauthorized modifications made to the...

  • Page 7: Installation Guidelines

    All installations and services must be performed by qualified service personnel. 5. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections. Refer to Section II, L of this manual. 6.

  • Page 8: Installation Location

    All installations and services must be performed by qualified service personnel. B. Installation Location • These furnaces are designed for indoor installation only. • These furnaces are NOT to be used as construction heaters. • The return air duct of the furnace must be sealed air tight to prevent starvation of the combustion air, especially if the furnace is located in a closet or confined area.

  • Page 9: Standard Clearances

    All installations and services must be performed by qualified service personnel. and MDA1-75; 100CA-BASE for MDA1-100; and 125CA-BASE for MDA1-125. refer to Figure 1. Figure 1: Counter flow Furnace Combustible Surface-Mounting Base D. Standard Clearances Definitions of combustible material and non-combustible as issued by the National Fuel Gas Code are as follows: Combustible Material: Materials made of or surfaced with wood, compressed paper, plant fibers,...

  • Page 10: Air For Combustion And Ventilation

    All installations and services must be performed by qualified service personnel. E. Air for Combustion and Ventilation Relief openings in the front or top of the furnace casing should not be obstructed or blocked. These openings supply combustion and ventilation air to the furnace. Chloride, fluoride, iodide, and bromide bearing compounds when present, even in low concentrations, in air supplied for combustion to the furnace, can result in accelerated and severe corrosion of the heat exchanger and/or the venting...

  • Page 11: Mda1 Horizontal Installation

    All installations and services must be performed by qualified service personnel. 1. Utility Room (example of a confined space) In buildings of unusually tight construction, such as those wherein weather stripping and storm sash windows are used, two (2) permanent openings connecting to a well-ventilated crawl space, attic, or with the outdoors shall be provided.
  • Page 12 All installations and services must be performed by qualified service personnel. A plenum angles kit, (AOPS4942) is available for connecting the supply plenum to the furnace. The kit consists of four angles that are to be screwed to into the predrilled holes in the base of the furnace using # 8 screws.

  • Page 13: Duct Work And Air Conditioning

    MHA125) is available which, is sized for the filter provided. If an optional Thermo Pride filter rack (Figure 3) is used with the furnace, square knock outs have been provided on each side casing to act as a template for the cut out.

  • Page 14: Use Of Non Thermo Pride Filter Retention Means

    If a method other than a Thermo Pride filter rack is selected for retention of the filter and/or use of a different filter type is desired, see Table 2 for minimum size...
  • Page 15 All installations and services must be performed by qualified service personnel. Table 2: Minimum Filter Area Required (Sq. in.) Maximum Furnace Model Rate of Filter Type MHA1-50 MHA1-75 MHA1-100 MHA1-125 Velocity MDA1-50 MDA1-75 MDA1-100 MDA1-125 (FPM) *THERMO PRODUCTS SUPPLIED PERMANENT FILTER STANDARD PERMANENT...

  • Page 16: Venting

    All installations and services must be performed by qualified service personnel. J. Venting 1. Vertical Venting • The vent installation of this Category I furnace must be in accordance with National Fuel Gas Code, NFPA 54/ANSI Z223.1-2002 or latest edition, and/or local building codes and these instructions. •...

  • Page 17: Replacing An Existing Furnace From A Common

    All installations and services must be performed by qualified service personnel. These venting tables also include venting combinations, which apply to common venting arrangements of two or more appliances. These requirements as well as all the installation requirements outlined in this manual for an MHA1/MDA1 series furnace must be followed when an MHA1/MDA1 furnace is common vented with another Category I gas appliance.

  • Page 18: Condensing In Chimney

    All installations and services must be performed by qualified service personnel. restriction, leakage, corrosion or other deficiencies which could cause an unsafe condition. 3. Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building.
  • Page 19 All installations and services must be performed by qualified service personnel. 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. Moisture (in the form of water vapor) occurs in flue gases when hydrogen is combined with oxygen during the chemical reaction produced by combustion.

  • Page 20: Vent Flue/Vent Connector

    All installations and services must be performed by qualified service personnel. 4. Flue/Vent Connector • Either drill a starter hole in the inducer or use a self-tapping screw to mount the flue pipe to the inducer. Failure to follow these instructions may damage the inducer.
  • Page 21 All installations and services must be performed by qualified service personnel. Figure 4: Vent Connection to Inducer A self-tapping sheet metal screw and high temperature sealant such as Dow Corning 736 or General Electric RTV106 (temperature rating 480°F minimum) should be used to secure both the flue pipe (MHA1/MDA1-50), and the Thermo Products supplied adapter...
  • Page 22 All installations and services must be performed by qualified service personnel. When venting the MDA1 series through the blower compartment a vent chute (AOPS4941) must be used. Refer to Figure 4. This option requires the removal of the two 4-inch diameter plastic plug from the blower pan and the top panel of the unit.

  • Page 23: Sidewall Venting

    All installations and services must be performed by qualified service personnel. It is recommended that all single wall vent connectors connected to the MHA1/MDA1 Series furnaces have all seams and joints sealed with high temperature pressure sensitive aluminum tape or high temperature silicone rubber sealant as noted below.

  • Page 24: Horizontal Size And Lengths For Horizontal Vents

    All installations and services must be performed by qualified service personnel. Installation, setup, and operation must be in accordance with the instruction provided by the manufacture of the power venter. Thermo Products has provided in the following section maximum and minimum vent lengths guidelines that must also be followed.

  • Page 25: Gas/Gas Piping

    All installations and services must be performed by qualified service personnel. L. GAS PIPING GENERAL GAS PIPING FIRE OR EXPLOSION HAZARD • Failure to follow the safety warnings exactly could result in serious injury, death or property damage. • Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections.
  • Page 26 All installations and services must be performed by qualified service personnel. 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. A readily accessible, design certified manual shut off valve with a non- displaceable rotor member shall be installed within six feet of the gas equipment it serves.

  • Page 27: Installation Of Natural Gas Piping

    All installations and services must be performed by qualified service personnel. GROUND JOINT MANUAL GAS SHUT OFF VALVE STREET ELBOW GAS VALVE SEDIMENT TRAP " N.P.T. MANIFOLD PRESSURE TAP 5 FT. NOTE: MHA1 SERIES ACTUAL UNIT MAY DIFFER SLIGHTLY FROM WHAT IS SHOWN. Figure 6: Typical Gas Piping 1.

  • Page 28: Installation Of Propane Gas Piping

    All installations and services must be performed by qualified service personnel. TABLE 4: Steel Pipe Size for Natural Gas (IPS) Burner Feet of Pipe From Meter to Burner Firing Rate, BTU/Hr 50,000 100,000 150,000 1-1/4 200,000 1-1/4 1-1/4 1-1/4 250,000 1-1/4 1-1/4 1-1/4...
  • Page 29 Figure 7: Typical Piping For Two-Stage Regulation NOTICE: Two-stage regulation must be installed for propane gas when used with any Thermo Pride propane furnace. See illustration above of a typical two stage piping system. Table 5: COPPER TUBING SIZE FOR PROPANE GASES All black pipe sizes shown are nominal iron pipe sizes.

  • Page 30: Electrical

    All installations and services must be performed by qualified service personnel. M. Electrical 1. Wiring The furnace must be grounded in accordance with local codes or in the absence of local codes with the National Electrical Code, ANSI/NFPA 70-2002, or latest edition. All wiring shall be performed by a qualified electrician or service person.

  • Page 31: Electronic Air Cleaner And Humidifier Connections

    All installations and services must be performed by qualified service personnel. 3. Electronic Air Cleaner and Humidifier Connections The ignition module on this furnace has designated terminals to control the operation of an electronic air cleaner and/or humidifier. These terminals provide line voltage for the control of these accessories (See Figure 8).

  • Page 32: Blower Motor Speed Wiring

    All installations and services must be performed by qualified service personnel. Anticipators for the cooling operation are generally pre-set by the thermostat manufacturer and require no adjustment. 5. Blower Motor Speed Wiring • TURN OFF THE ELECTRICAL POWER to the furnace before attempting to change blower speed wiring.

  • Page 33: Initial Operation Of The Furnace

    All installations and services must be performed by qualified service personnel. Table 6: Blower delay settings for heating cycles To delay fan Set Switch turn-on by: 15 sec. 30 sec. *45 sec. 60 sec, To delay fan Set Switch turn-off by: 60 sec.
  • Page 34 All installations and services must be performed by qualified service personnel. b. Leak test all field gas piping connections. c. Check the tubing to the pressure switch to make sure it is snug and completely seated on the pressure tap. d.
  • Page 35 All installations and services must be performed by qualified service personnel. Operating Instructions: STOP! Read the safety information above. Set the thermostat to the lowest setting. Turn off all electric power to the appliance. This appliance is equipped with a hot surface igniter that automatically lights the burner.

  • Page 36: Adjustment Of Heat Input Rate

    All installations and services must be performed by qualified service personnel. B. Adjustment Of Heat Input Rate The main burner gas orifices for this unit were selected based upon the following assumed characteristic values of the two fuel gases suitable for use with this appliance design: a.
  • Page 37 All installations and services must be performed by qualified service personnel. 3. The following formula may be used to calculate the heat input rate for the appliance: Gas heating value x Amount of gas consumed = Heat input rate, or Amount of time required to consume the gas BTU/cu ft x Number of cu ft x 3600 seconds = Input rate (BTU/hr).

  • Page 38: Burner Adjustment

    All installations and services must be performed by qualified service personnel. b. Turn on the fuel gas and cause the appliance to activate the heating section by answering a “call for heat”. c. Allow the heating section to operate for 15 minutes. d.

  • Page 39: Setting Supply Air Temperature Rise

    All installations and services must be performed by qualified service personnel. Figure 10: Typical Observation of Main Burner Flames If long, rather poorly defined, mostly yellow in color, and nearly opaque burner flames are observed, this is an indication the quality of combustion is poor. (Under adverse conditions, black smoke and some sooting may be noticeable as well.) Some of the causes of poor combustion are, too high an input rate (“over- firing”), too little or a contaminated supply of combustion air, or a partially...

  • Page 40: Checkout Procedure

    All installations and services must be performed by qualified service personnel. E. Checkout Procedure Before any system of gas piping is finally put into service, it shall be carefully tested to assure that it is “gas-tight”, as indicated in the General Gas Piping Requirements section of this manual.

  • Page 41: Troubleshooting

    All installations and services must be performed by qualified service personnel. IV. Troubleshooting NOTICE: BEFORE TROUBLESHOOTING, FAMILIARIZE YOURSELF WITH THE START UP AND CHECKOUT PROCEDURE. ALL INSTALLATION AND SERVICES MUST BE PERFORMED BY QUALIFIED HEATING CONTRACTORS. To assist you in troubleshooting this furnace, it is equipped with an integrated ignition control with diagnostics.

  • Page 42: Dealer Maintenance

    All installations and services must be performed by qualified service personnel. V. Dealer Maintenance SAFETY DURING SERVICING AND INSPECTION ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD • Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. •...

  • Page 43: House Air Blower

    All installations and services must be performed by qualified service personnel. 2. Chimney/vent pipe - Vertically vented units - Remove flue pipe from inducer and inspect for restriction, loose joints, carbon build-up and condensation. Clean vent and chimney if necessary and replace or repair any degraded vent, vent connector or chimney damage found.

  • Page 44: Return Air Filter

    All installations and services must be performed by qualified service personnel. D. Return Air Filter The Return Air Filter(s): Provided with this unit is a permanent type filter. This filter(s) should be inspected and when dirty, cleaned or replaced, if necessary to assure proper furnace operation.

  • Page 45: Installers Instructions To User

    All installations and services must be performed by qualified service personnel. IMPORTANT: Remind homeowner of the importance of monthly filter inspections during operation to ensure maximum efficiency. VI. Installers Instructions to User After completing the installation, the installer shall inform and/or demonstrate to the homeowner: 1.

  • Page 46: Appendix A: Sources For Referenced Standards

    All installations and services must be performed by qualified service personnel. APPENDIX A: SOURCES FOR REFERENCE STANDARDS 1. Air Conditioning Contractors of America 1712 New Hampshire Avenue, NW Washington, D.C. 20009 (202) 483-9370 2. American Gas Association Distribution Center P.O. Box 79230 Baltimore, Maryland 21279-0230 (301) 617-7819 3.

  • Page 47: Appendix B: Sequence Of Operation

    All installations and services must be performed by qualified service personnel. APPENDIX B: SEQUENCE OF OPERATIONS A. Sequence of Operations for Heating System Mode of Operation Control System Action Standby (At any time the gas Continous safe operation check. If flame simulation condition present valve is not energized) or roll-out switch opens,system...

  • Page 48: Mode Of Operation

    All installations and services must be performed by qualified service personnel. Mode of Operation Control System Action After delay-to-fan-on period ends, circulating air fan is energized at heating speed. The (optional) electronic air Main Burner cleaner and humidifier are Operation energized.

  • Page 49: Appendix C: Troubleshooting Flowchart

    All installations and services must be performed by qualified service personnel. APPENDIX C: TROUBLESHOOTING FLOWCHARTS A. Heating System Set thermostat subbase to "HEAT". Does thermostat make contact? Is room temperature Turn thermostat setting above thermostat setting? above room temp. Is the transformer supplying 24 VAC to the thermostat ? Replace thermostat.
  • Page 50 All installations and services must be performed by qualified service personnel. Is there 120 VAC across draft inducer power terminals "IND" & "IND N" at the ignition control module? Check wiring to draft inducer. If okay, replace inducer assembly. Check the ignition control module After pre-purge,does the Is there voltage present at the diagnostic LED lamp.
  • Page 51 All installations and services must be performed by qualified service personnel. Measure gas supply pressure at inlet to gas valve. Is it at least 4.5" W.G. for natural gas After gas valve opens, or 11" W.G. for L.P. gases? Check gas supply. Open all do the burners ignite? manual gas control valves serving the unit.
  • Page 52 All installations and services must be performed by qualified service personnel. Does system run until Check all wiring for thermostat is satisfied? Is LED light on ignition loose connections. control module flashing? If LED Light Flashes: 1 Flash, then pause....System lockout 2 Flashes, then pause..Pressure switch stuck closed 3 Flashes, then pause..Pressure switch stuck open 4 Flashes, then pause..Open high limit, aux.

  • Page 53: Appendix D: Parts Package Components

    All installations and services must be performed by qualified service personnel. APPENDIX D: PARTS PACKAGE COMPONENTS INSTALLATION PARTS PACKAGE MDA1/MHA1-50(S00S4426) DESCRIPTION PART NUMBER QTY. WIRE NUT 300132 #8X1/2 TEK SCREWS 300208 for mounting 2X4 J-box #10-32X1/2 GND SCREW 300109 #10-32 HEX NUT 300110 3/16”...

  • Page 54: Appendix E: Replacement Parts List

    All installations and services must be performed by qualified service personnel. APPENDIX E: REPLACEMENT PARTS LIST - MHA1...
  • Page 55 All installations and services must be performed by qualified service personnel.
  • Page 56 All installations and services must be performed by qualified service personnel. REPLACEMENT PARTS LIST - MDA1...
  • Page 57 All installations and services must be performed by qualified service personnel.

  • Page 58: Appendix F: Electrical Diagrams

    All installations and services must be performed by qualified service personnel. APPENDIX F: WIRING DIAGRAM...
  • Page 59 All installations and services must be performed by qualified service personnel.
  • Page 60 All installations and services must be performed by qualified service personnel. APPENDIX G: MID-EFFICENCY FURNACE SPECIFICATIONS MID-EFFICIENCY HIGHBOY GAS FURNACE SPECIFICATIONS Model NO. MHA1-50 MHA1-75 MHA1-100 MHA1-125 50,000 75,000 100,000 125,000 Heat input rate (BTUH) 40,000 59,000 79,000 99,000 Heating capacity (BTUH) Nominal temp.
  • Page 61 All installations and services must be performed by qualified service personnel. MID-EFFICIENCY COUNTERFLOW / HORIZONTAL GAS FURNACE SPECIFICATIONS Model NO. MDA1-50 MDA1-75 MDA1-100 MDA1-125 50,000 75,000 100,000 125,000 Heat input rate (BTUH) 40,000 60,000 81,000 101,000 Heating capacity (BTUH) Nominal temp. rise 70°...

This manual is also suitable for:

Mda1-50nMha1-75nMda1-75nMha1-100nMda1-100nMha1-125n ... Show all

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