Thermo Products CMA1-50N, CMA2-75N service manual Yes AFTER GAS VALVE OPENS, DO THE BURNERS IGNITE?

Page 49

Yes

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

Yes

AFTER GAS VALVE

OPENS, DO THE

BURNERS IGNITE?

Yes

DO BURNERS STAY

LIT PAST PROOF

OF FLAME CHECK?


No		CHECK FOR PROPER
		MANIFOLD PRESSURE.

			Yes
			Yes

IS IGNITOR

POSITIONED CORRECTLY?

ADJUST TO 3.5" FOR NATURAL GAS

OR 10.0" WC FOR LP GAS

No	REPOSITION TO

CORRECT LOCATION.

		Yes

	DOES THE INTEGRATED CONTROL						CHECK ACROSS THE
	ENERGIZE THE				No		CIRCULATING AIR		No	REPLACE THE
	CIRCULATING AIR BLOWER						BLOWER TERMINALS			REPLACE THE
	CIRCULATING AIR BLOWER						BLOWER TERMINALS			INTEGRATED CONTROL.
	AFTER THE 45 SECOND						"CIR N" & "HEAT"			INTEGRATED CONTROL.
	AFTER THE 45 SECOND						"CIR N" & "HEAT"
		TIME DELAY.					FOR PROPER VOLTAGE.

Yes
				CONFIRM IF
				EITHER BLOWER WHEEL
DOES THE CIRCULATING	No	DOES BLOWER	No	IS RUBBING AGAINST
AIR FAN COME ON		DOES BLOWER		HOUSING OR MOTOR
AIR FAN COME ON		SPIN FREELY?		HOUSING OR MOTOR
WHEN ENERGIZED?		SPIN FREELY?		SHAFT IS SPINNING
WHEN ENERGIZED?				SHAFT IS SPINNING
				FREELY AND REPAIR
		Yes		OR REPLACE AS NECESSARY.
Yes			Yes
		IS CAPACITOR	Yes	REPLACE MOTOR
		IS CAPACITOR
		WORKING PROPERLY
		WORKING PROPERLY

No

REPLACE CAPACITOR

47

Image 49

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