Thermo Products CMA1-50N service manual Gas Fired High Efficiency Furnace, For Your Safety

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GAS FIRED HIGH EFFICIENCY FURNACE

GAS FIRED HIGH EFFICIENCY FURNACE

DOWN FLOW & DIRECT VENT (SEALED COMBUSTION)

MODEL: CMA1-50N & CMA2-75N

INSTALLATION AND SERVICE MANUAL

For installation in:

1.Manufactured Homes

2.Modular Homes/Buildings

3.Site Constructed—Residential (Single Story Dwellings)

FOR YOUR SAFETY

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

Do not try to light any appliance.

Do not touch any electrical switch; do not use any phone in your building.

Immediately call your gas supplier from a neighbor’s phone.

Follow the gas supplier’s instructions.

If you cannot reach your gas supplier, call the fire department.

DOWN FLOW & DIRECT VENT (SEALED COMBUSTION)MODEL: CMA1-50N & CMA2-75NINSTALLATION AND SERVICE MANUALFOR YOUR SAFETYWHAT TO DO IF YOU SMELL GASManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual background: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or loss of life.

Manual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual background: Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information, consult a qualified installer, service agency, or fuel supplier.

Manual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual background: Do not use this appliance if any part has been underwater. Immediately call a qualified service technician to inspect the appliance and to replace any part of the electrical or control system that has been underwater.

PLEASE READ THESE INSTRUCTIONS PRIOR TO INSTALLATION, INITIAL FIRING, AND BEFORE PERFORMING ANY SERVICE OR MAINTENANCE. THESE INSTRUCTIONS MUST BE LEFT WITH THE USER AND SHOULD BE RETAINED FOR FUTURE REFERENCE BY QUALIFIED SERVICE PERSONNEL.

MG-508

ECN 5135-MA 100615

THERMO PRODUCTS, LLC.

POST OFFICE BOX 217

NORTH JUDSON, IN 46366

PHONE: (574) 896-2133

MADE IN USA

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Contents FOR YOUR SAFETY INSTALLATION AND SERVICE MANUALGAS FIRED HIGH EFFICIENCY FURNACE DOWN FLOW & DIRECT VENT SEALED COMBUSTIONSECTION TABLE OF CONTENTSI. SAFETY INFORMATION Page Page The vent and air intake elbows must be kept away from bushes, shrubs or any vegetation that may restrict the flow of flue products. It must also be kept clear of any leaves, weeds or other combustible materials. Keep the vent hood clear of snow. Avoid locating the terminals in areas where standing water or condensate drippage may be a problem 1.A windows be opened DIMENSIONS II. FURNACE SPECIFICATIONS - CMA SERIESMODEL GAS SUPPLY PRESSUREINSTALLATION PARTS PACKAGE NON-COMBUSTIBLEMATERIAL COMBUSTIBLE MATERIAL.” COMBUSTIBLE MATERIALMODELS CMA IV. GENERAL INSTALLATION A.FURNACE LOCATIONTable Coil Cabinet Combustible Floor Base Model: 70-BASE Figure 1AFigure 1B Cottage Base Model: 01COT-BASE Figure 1C 1. Combustible Floor Base Model: 70 BASE B. BASE INSTALLATIONFigure Figure 2. Cottage Base Model: 01COT BASE C. ALCOVE INSTALLATIONFigure Figure D. CLOSET INSTALLATIONE. FUEL PIPING F.GENERAL VENTING REQUIREMENTS Table MAXIMUM VENT LENGTHFigure 6. CMA*-75SHOWN 1. Vent And Combustion Air Pipes H. Direct Venting Through a Sidewall2. Exhaust Vent Termination Elbow Sidewall Venting Page 4. Vent Terminal Location Guidelines Terminations Figure Figure 5.Secure plate to roofFigure K.CONDENSATE DRAIN LINE AND TRAP ASSEMBLY 2.Connection Of Power Supply Wires Figure L.ELECTRICAL WIRING3.Connection Of Room Thermostat Wires 1. Electrical Branch Supply CircuitElectrical Wire Diameter AWG 24 22 20 18 4. BLOWER MOTOR SPEED WIRING Figure Speed Tap \ CMA1-50Static PressureSpeed Tap \ CMA2-75Static Pressure5. FIELD WIRING AND REPLACING WIRING V.STARTING THE UNIT A. SEQUENCE OF OPERATIONS MAIN BURNER OPERATION CALL FOR HEAT SATISFIED OPERATING INSTRUCTIONS B.INITIAL START UPC.ADJUSTMENT OF BTU INPUT RATE D.BURNER ADJUSTMENT GAS PRESSURE CHART FOR CMA* MODEL FURNACESFigure E.SETTING TEMPERATURE RISEF.FURNACE CHECKOUT PROCEDURE VII. DEALER MAINTENANCE VI. INSTALLERS INSTRUCTIONS TO USER4. INDUCER BLOWER ASSEMBLY 2.CONDENSATE LINE/TRAP ASSEMBLYA.ELECTRICAL B.GENERAL INSPECTION5. GASKETS/SEALING MATERIALS 1.CLEANING THE COIL AIR SIDEC.HEAT EXCHANGER D.HOUSE AIR BLOWERFILTER REPLACEMENT FILTER MAINTENANCE PROCEDUREVIII. TROUBLESHOOTING DIAGNOSTIC FEATURESThe LED will also flash once at power-up TROUBLESHOOTING GUIDE AT THE INTEGRATED CONTROL? Yes AFTER GAS VALVE OPENS, DO THE BURNERS IGNITE? DOES SYSTEM RUN UNTIL THERMOSTAT IS SATISFIED? IF LED LIGHT FLASHES APPENDIX – A REPLACEMENT PARTS Page APPENDIX – B WIRING DIAGRAM