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Thermo Products
CMA1-50N, CMA2-75N
service manual
Models:
CMA1-50N
CMA2-75N
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Troubleshooting
Install
Appendix – B Wiring Diagram
Figure L.ELECTRICAL WIRING
Dimension
Maintenance
Inducer Blower Assembly
F.Furnace Checkout Procedure
C.Adjustment Of Btu Input Rate
E.Setting Temperature Rise
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All installations and services must be performed by qualified service personnel.
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Contents
DOWN FLOW & DIRECT VENT SEALED COMBUSTION
INSTALLATION AND SERVICE MANUAL
FOR YOUR SAFETY
GAS FIRED HIGH EFFICIENCY FURNACE
SECTION
TABLE OF CONTENTS
I. 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 SERIES
DIMENSIONS
MODEL
INSTALLATION PARTS PACKAGE
NON-COMBUSTIBLEMATERIAL
COMBUSTIBLE MATERIAL.” COMBUSTIBLE MATERIAL
MODELS CMA
IV. GENERAL INSTALLATION A.FURNACE LOCATION
Table
Coil Cabinet
Combustible Floor Base Model: 70-BASE Figure 1A
Figure 1B
Cottage Base Model: 01COT-BASE Figure 1C
1. Combustible Floor Base Model: 70 BASE
B. BASE INSTALLATION
Figure Figure
2. Cottage Base Model: 01COT BASE
C. ALCOVE INSTALLATION
Figure
Figure
D. CLOSET INSTALLATION
E. FUEL PIPING
F.GENERAL VENTING REQUIREMENTS
Table
MAXIMUM VENT LENGTH
Figure 6. CMA*-75SHOWN
1. Vent And Combustion Air Pipes
H. Direct Venting Through a Sidewall
2. Exhaust Vent Termination Elbow
Sidewall Venting
Page
4. Vent Terminal Location Guidelines
Terminations
Figure Figure
5.Secure plate to roof
Figure K.CONDENSATE DRAIN LINE AND TRAP ASSEMBLY
1. Electrical Branch Supply Circuit
Figure L.ELECTRICAL WIRING
2.Connection Of Power Supply Wires
3.Connection Of Room Thermostat Wires
Electrical Wire Diameter AWG 24 22 20 18
4. BLOWER MOTOR SPEED WIRING Figure
Pressure
CMA1-50
Speed Tap \
Static
Pressure
CMA2-75
Speed Tap \
Static
5. 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 UP
C.ADJUSTMENT OF BTU INPUT RATE
D.BURNER ADJUSTMENT
GAS PRESSURE CHART FOR CMA* MODEL FURNACES
Figure
E.SETTING TEMPERATURE RISE
F.FURNACE CHECKOUT PROCEDURE
VII. DEALER MAINTENANCE
VI. INSTALLERS INSTRUCTIONS TO USER
B.GENERAL INSPECTION
2.CONDENSATE LINE/TRAP ASSEMBLY
4. INDUCER BLOWER ASSEMBLY
A.ELECTRICAL
D.HOUSE AIR BLOWER
1.CLEANING THE COIL AIR SIDE
5. GASKETS/SEALING MATERIALS
C.HEAT EXCHANGER
DIAGNOSTIC FEATURES
FILTER MAINTENANCE PROCEDURE
FILTER REPLACEMENT
VIII. TROUBLESHOOTING
The 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
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