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

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

This and the previous page contain reproductions of the various safety and instruction labels placed on the Thermo Pride Condensing Gas Furnaces. Please read and comply with the contents of these labels.

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Contents INSTALLATION AND SERVICE MANUAL FOR YOUR SAFETYGAS FIRED HIGH EFFICIENCY FURNACE DOWN FLOW & DIRECT VENT SEALED COMBUSTIONTABLE OF CONTENTS SECTIONI. 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 II. FURNACE SPECIFICATIONS - CMA SERIES DIMENSIONSMODEL GAS SUPPLY PRESSUREINSTALLATION PARTS PACKAGE COMBUSTIBLE MATERIAL.” COMBUSTIBLE MATERIAL NON-COMBUSTIBLEMATERIALMODELS 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 D. CLOSET INSTALLATION FigureE. FUEL PIPING F.GENERAL VENTING REQUIREMENTS MAXIMUM VENT LENGTH TableFigure 6. CMA*-75SHOWN H. Direct Venting Through a Sidewall 1. Vent And Combustion Air Pipes2. Exhaust Vent Termination Elbow Sidewall Venting Page 4. Vent Terminal Location Guidelines Terminations 5.Secure plate to roof Figure FigureFigure K.CONDENSATE DRAIN LINE AND TRAP ASSEMBLY Figure L.ELECTRICAL WIRING 2.Connection Of Power Supply Wires3.Connection Of Room Thermostat Wires 1. Electrical Branch Supply CircuitElectrical Wire Diameter AWG 24 22 20 18 4. BLOWER MOTOR SPEED WIRING Figure CMA1-50 Speed Tap \Static PressureCMA2-75 Speed Tap \Static Pressure5. FIELD WIRING AND REPLACING WIRING V.STARTING THE UNIT A. SEQUENCE OF OPERATIONS MAIN BURNER OPERATION CALL FOR HEAT SATISFIED B.INITIAL START UP OPERATING INSTRUCTIONSC.ADJUSTMENT OF BTU INPUT RATE GAS PRESSURE CHART FOR CMA* MODEL FURNACES D.BURNER ADJUSTMENTE.SETTING TEMPERATURE RISE FigureF.FURNACE CHECKOUT PROCEDURE VI. INSTALLERS INSTRUCTIONS TO USER VII. DEALER MAINTENANCE2.CONDENSATE LINE/TRAP ASSEMBLY 4. INDUCER BLOWER ASSEMBLYA.ELECTRICAL B.GENERAL INSPECTION1.CLEANING THE COIL AIR SIDE 5. GASKETS/SEALING MATERIALSC.HEAT EXCHANGER D.HOUSE AIR BLOWERFILTER MAINTENANCE PROCEDURE FILTER REPLACEMENTVIII. 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