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Thermo Products CMA1-50N, CMA2-75N service manual

Models: CMA1-50N CMA2-75N

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

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Thermo Products CMA1-50N, CMA2-75N service manual

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 MATERIALTable IV. GENERAL INSTALLATION A.FURNACE LOCATIONMODELS CMA Figure 1B Combustible Floor Base Model: 70-BASE Figure 1ACoil Cabinet Cottage Base Model: 01COT-BASE Figure 1C Figure Figure B. BASE INSTALLATION1. Combustible Floor Base Model: 70 BASE Figure C. ALCOVE INSTALLATION2. Cottage Base Model: 01COT BASE 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