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Thermo Products
CMA2-75N, CMA1-50N
service manual
Field Wiring And Replacing Wiring
Models:
CMA1-50N
CMA2-75N
1
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55
55
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55 pages
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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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Contents
GAS FIRED HIGH EFFICIENCY FURNACE
INSTALLATION AND SERVICE MANUAL
FOR YOUR SAFETY
DOWN FLOW & DIRECT VENT SEALED COMBUSTION
TABLE OF CONTENTS
SECTION
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
MODEL
II. FURNACE SPECIFICATIONS - CMA SERIES
DIMENSIONS
GAS SUPPLY PRESSURE
INSTALLATION PARTS PACKAGE
COMBUSTIBLE MATERIAL.” COMBUSTIBLE MATERIAL
NON-COMBUSTIBLEMATERIAL
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
D. CLOSET INSTALLATION
Figure
E. FUEL PIPING
F.GENERAL VENTING REQUIREMENTS
MAXIMUM VENT LENGTH
Table
Figure 6. CMA*-75SHOWN
H. Direct Venting Through a Sidewall
1. Vent And Combustion Air Pipes
2. Exhaust Vent Termination Elbow
Sidewall Venting
Page
4. Vent Terminal Location Guidelines
Terminations
5.Secure plate to roof
Figure Figure
Figure K.CONDENSATE DRAIN LINE AND TRAP ASSEMBLY
3.Connection Of Room Thermostat Wires
Figure L.ELECTRICAL WIRING
2.Connection Of Power Supply Wires
1. Electrical Branch Supply Circuit
Electrical Wire Diameter AWG 24 22 20 18
4. BLOWER MOTOR SPEED WIRING Figure
Static
CMA1-50
Speed Tap \
Pressure
Static
CMA2-75
Speed Tap \
Pressure
5. 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 INSTRUCTIONS
C.ADJUSTMENT OF BTU INPUT RATE
GAS PRESSURE CHART FOR CMA* MODEL FURNACES
D.BURNER ADJUSTMENT
E.SETTING TEMPERATURE RISE
Figure
F.FURNACE CHECKOUT PROCEDURE
VI. INSTALLERS INSTRUCTIONS TO USER
VII. DEALER MAINTENANCE
A.ELECTRICAL
2.CONDENSATE LINE/TRAP ASSEMBLY
4. INDUCER BLOWER ASSEMBLY
B.GENERAL INSPECTION
C.HEAT EXCHANGER
1.CLEANING THE COIL AIR SIDE
5. GASKETS/SEALING MATERIALS
D.HOUSE AIR BLOWER
VIII. TROUBLESHOOTING
FILTER MAINTENANCE PROCEDURE
FILTER REPLACEMENT
DIAGNOSTIC FEATURES
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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