Thermo Products CMA1-50N, CMA2-75N Models Cma, Table, Iv. General Installation A.Furnace Location

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

MODELS CMA	CLOSET	ALCOVE
FRONT	6”	18”
BACK	0”	0”
SIDES	0”	0”
VENT CONNECTOR(PVC)	0”	0”
TOP	0”	0”
PLENUM SIDES	1”	1”
TOP AND SIDES OF DUCT	1”	1”
BOTTOM OF DUCT	1”	1”

Table 1

This heating appliance must be installed with clearances not less than the minimums shown above as well as ample clearance for easy access to the air filter, blower assembly, burner assembly, controls, and vent connections.

IV. GENERAL INSTALLATION

A.FURNACE LOCATION

1.For best performance, locate the furnace so that it is centralized with respect to the duct system.

2.The furnace installation is only intended for free air return through the furnace door louvers. DO NOT connect a ducted return air system directly to the furnace. An improper return air installation may create a hazard and damage equipment, as well as void all warranties.

3.This furnace may be installed on a combustible floor when utilizing either the No. 70 counterflow floor base or CE111S / CE211T coil cabinet for below the floor duct systems, or the cottage base for floor level air distribution. See Figure 1A for description of Combustible Floor Base and Figure 1C for Cottage Base.

This furnace is ETL listed for closet, alcove or free standing applications. All applications must comply with the requirements of this manual.

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Contents DOWN FLOW & DIRECT VENT SEALED COMBUSTION INSTALLATION AND SERVICE MANUALFOR YOUR SAFETY GAS FIRED HIGH EFFICIENCY FURNACESECTION 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 GAS SUPPLY PRESSURE II. FURNACE SPECIFICATIONS - CMA SERIESDIMENSIONS MODELINSTALLATION 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 1. Electrical Branch Supply Circuit Figure L.ELECTRICAL WIRING2.Connection Of Power Supply Wires 3.Connection Of Room Thermostat WiresElectrical Wire Diameter AWG 24 22 20 18 4. BLOWER MOTOR SPEED WIRING Figure Pressure CMA1-50Speed Tap \ StaticPressure CMA2-75Speed Tap \ Static5. 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 USERB.GENERAL INSPECTION 2.CONDENSATE LINE/TRAP ASSEMBLY4. INDUCER BLOWER ASSEMBLY A.ELECTRICALD.HOUSE AIR BLOWER 1.CLEANING THE COIL AIR SIDE5. GASKETS/SEALING MATERIALS C.HEAT EXCHANGERDIAGNOSTIC FEATURES FILTER MAINTENANCE PROCEDUREFILTER REPLACEMENT VIII. TROUBLESHOOTINGThe 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