Thermo Pride CMA3-50D36N Installation And Service Manual
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Thermo Pride CMA3-50D36N Installation And Service Manual

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GAS FIRED HIGH EFFICIENCY FURNACE
DOWNFLOW & DIRECT VENT (SEALED COMBUSTION)
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
:
If the information in these instructions is not followed exactly, a fire or explosion may
result causing property damage, personal injury, or loss of life.
: Improper installation, adjustment, alteration, service, or maintenance can cause injury or
property damage. Refer to this manual. For assistance or additional information, consult a qualified
installer, service agency, or fuel supplier.
: Do not use this appliance if any part has been underwater. Immediately call a qualified
service technician to inspect the appliance and to replace any part of the electrical or control system
that has been underwater.
PLEASE READ THESE INSTRUCTIONS PRIOR TO INSTALLATION, INITIAL FIRING, AND BEFORE PERFORMING
ANY SERVICE OR MAINTENANCE. THESE INSTRUCTIONS MUST BE LEFT WITH THE USER AND SHOULD BE
RETAINED FOR FUTURE REFERENCE BY QUALIFIED SERVICE PERSONNEL.
MG-517
ECN 5396-MA 141211
MODELS:
CMA3-50D36N, CMA3-75D36N,
CMC1-50D36N, CMC1-75D36N,
CMC1-50DV3N, CMC1-75DV3N
INSTALLATION AND SERVICE MANUAL
For installation in:
1. Manufactured Homes
2. Modular Homes/Buildings
3. Site Constructed—Residential (Single Story Dwellings)

FOR YOUR SAFETY

WHAT TO DO IF YOU SMELL GAS
THERMO PRODUCTS, LLC.
POST OFFICE BOX 217
NORTH JUDSON, IN 46366
PHONE: (574) 896-2133
MADE IN USA

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Summary of Contents for Thermo Pride CMA3-50D36N

  • Page 1: For Your Safety

    GAS FIRED HIGH EFFICIENCY FURNACE DOWNFLOW & DIRECT VENT (SEALED COMBUSTION) MODELS: CMA3-50D36N, CMA3-75D36N, CMC1-50D36N, CMC1-75D36N, CMC1-50DV3N, CMC1-75DV3N INSTALLATION AND SERVICE MANUAL For installation in: 1. Manufactured Homes 2. Modular Homes/Buildings 3. Site Constructed—Residential (Single Story Dwellings) FOR YOUR SAFETY Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SECTION BEGINNING PAGE SAFETY INFORMATION FURNACE SPECIFICATIONS III. GENERAL INSTRUCTIONS AND CLEARANCES IV. GENERAL INSTALLATION A. FURNACE LOCATION B. BASE INSTALLATION C. ALCOVE INSTALLATION D. CLOSET INSTALLATION E. FUEL PIPING F. GENERAL VENTING REQUIREMENTS G. CONNECTING THE EXHAUST VENT, AND COMBUSTION AIR INTAKE H.

  • Page 3: Safety Information

    All installations and services must be performed by qualified service personnel. I. SAFETY INFORMATION This and the following page contain reproductions of the various warning and instruction labels placed on the Thermo Pride Condensing Gas Furnaces. Please read and comply with the contents of these labels.
  • Page 4 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.
  • Page 5 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.
  • Page 6 Section IV. The following pages contain various warnings and cautions found throughout the Thermo Pride Gas Fired High Efficiency Furnace Manual. Please read and comply with the statements below. : This furnace is not to be used for temporary heating of buildings or structures under construction.
  • Page 7 All installations and services must be performed by qualified service personnel. 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.
  • Page 8 All installations and services must be performed by qualified service personnel. : Copper and brass tubing and fittings (except tin lined) shall not be used if the gas contains more than a trace (0.3 grains per 100 cubic ft.) of hydrogen sulfide gas.

  • Page 9: Furnace Specifications

    All installations and services must be performed by qualified service personnel. II. FURNACE SPECIFICATIONS MODEL CMA3-50D36 CMA3-75D36 INPUT IN BTUH 50,000 75,000 OUTPUT IN BTUH 48,000 72,000 MAIN ORIFICE-NAT. MAIN ORIFICE-LP GAS SUPPLY PRESSURE L.P. MINIMUM 11” IN.W.C. NAT. MINIMUM 4.5”IN.W.C.
  • Page 10 All installations and services must be performed by qualified service personnel. MODEL CMC1-50D36 CMC1-75D36 INPUT IN BTUH 50,000 75,000 OUTPUT IN BTUH 48,000 72,000 MAIN ORIFICE-NAT. MAIN ORIFICE-LP GAS SUPPLY PRESSURE L.P. MINIMUM 11” IN.W.C. NAT. MINIMUM 4.5”IN.W.C. L.P. MAXIMUM 14”...
  • Page 11 All installations and services must be performed by qualified service personnel. MODEL CMC1-50DV3 CMC1-75DV3 INPUT IN BTUH 50,000 75,000 OUTPUT IN BTUH 48,000 72,000 MAIN ORIFICE-NAT. MAIN ORIFICE-LP GAS SUPPLY PRESSURE L.P. MINIMUM 11” IN.W.C. NAT. MINIMUM 4.5”IN.W.C. L.P. MAXIMUM 14”...
  • Page 12 All installations and services must be performed by qualified service personnel. INSTALLATION PARTS PACKAGES CMA3-50D36N CMA3-75D36N PARTS PKG# S00S4248 S00S4249 DESCRIPTION PART # PART # J-box cover 350020 350020 Wire nut 300132 300132 3" stainless steel hose clamp 300276 300276 2-3/8"...

  • Page 13: General Instructions And Clearances

    All installations and services must be performed by qualified service personnel. III. GENERAL INSTRUCTIONS AND CLEARANCES – READ BEFORE START OF INSTALLATION 1. The BTU output capacity of the furnace proposed for installation should be based on a heat loss calculation made according to the manuals provided by the Air Conditioning Contractors of America (ACCA) or the American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc.
  • Page 14 All installations and services must be performed by qualified service personnel. c. American National Standard (ANSI-Z223.1/NFPA-54) for all gas-fired furnaces. d. American National Standard (ANSI-C1/NFPA-70 Electric Code for all electrical field wiring. e. These gas-fired units have been investigated under standards ANSI Z 21.47 CAN/CGA Z223-2001 Central Furnace test standards.

  • Page 15: General Installation

    All installations and services must be performed by qualified service personnel. 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.
  • Page 16 All installations and services must be performed by qualified service personnel. Coil Cabinet Model: CE113S / CE213T Note: Coil cabinet cannot be utilized as a cottage base. CE113S CE213T Figure 1B. Cottage Base Model: 01COT-BASE For CMA3 models only. NOTE: Serves as a plenum for single story applications with exposed supply air systems.

  • Page 17: Base Installation

    All installations and services must be performed by qualified service personnel. B. BASE INSTALLATION – CMA3 models only 1. Combustible Floor Base Model: 70 BASE (for CMA3 models only) Use the base bottom panel as a template to mark floor opening locations (see Figure 2).
  • Page 18 All installations and services must be performed by qualified service personnel. After cutting openings in the floor, place the bottom panel in position. Mark the square opening location on the distribution duct at the connection point of the connector duct. Remove the bottom panel. Cut an opening in the distribution duct slightly larger than the connector duct.

  • Page 19: Alcove Installation

    All installations and services must be performed by qualified service personnel. C. ALCOVE INSTALLATION In this application, a minimum of 18 inches of clearance must be provided to the front of the unit. See Figure 4. Note – access to diagnostic view port. CMA3 SERIES CMC1 SERIES Figure 4.
  • Page 20 All installations and services must be performed by qualified service personnel. CMA3 SERIES CMC1 SERIES Figure 5. Do not obstruct any return air openings, including the return grille on the furnace. To do so may cause the furnace to activate the high limit and shut down.

  • Page 21: Fuel Piping

    All installations and services must be performed by qualified service personnel. 8. Gas piping is not to be located in or through the return duct system. E. FUEL PIPING Sizing and installation of fuel lines must be in accordance with Federal, State & Local regulations.

  • Page 22: General Venting Requirements

    All installations and services must be performed by qualified service personnel. hazardous situation. Dry moisture from all leads and terminals if wetting occurs. Wait at least 24 hours for the circuit to fully dry before energizing the system. The furnace and its gas valve must be disconnected from the gas supply during pressure testing of the gas supply system at pressures in excess of 1/2 PSIG or 14 inches w.c F.
  • Page 23 All installations and services must be performed by qualified service personnel. MAXIMUM VENT LENGTH VENT SIZE 2 IN. PVC FURNACE VENT EXHAUST COMBUSTION AIR INTAKE MODEL LENGTH VENT ELBOWS (NO.) (FT.) ELBOWS (NO.) CMA*/CMC* *Note the drain elbow supplied with furnace count as 1 elbow. **Note the two 45°...

  • Page 24: Connecting The Exhaust Vent And Combustion Air Intake

    All installations and services must be performed by qualified service personnel. G. CONNECTING THE EXHAUST VENT AND COMBUSTION AIR INTAKE Figure 6. shows the typical exhaust vent and combustion air intake connection for CMA/CMC furnace. Figure 6. Models CMA and CMC have a removable top front panel that will allow for improved access to assist installation of the exhaust vent and combustion air intake connection to the top of the furnace.
  • Page 25 All installations and services must be performed by qualified service personnel. the conclusion of the vent pipe installation. This will insure a leak free return air compartment. Refer to Figure 6A. Figure 6A. NOTICE: The exhaust vent pipe must be supported every 4 feet. After making sure the length of the piping is correct glue all connections in place.

  • Page 26: Direct Venting Through A Sidewall

    All installations and services must be performed by qualified service personnel. gas flame. Should acid compounds form in your furnace, it may reduce the life of the furnace. H. Direct Venting Through a Sidewall 1. Vent And Combustion Air Pipes Vent and combustion air pipes may pass through a maximum wall thickness of 18 inches.
  • Page 27 All installations and services must be performed by qualified service personnel. b. The bottom edge of the vent termination elbow must be installed at least 12-inches above the outlet of intake termination elbow. c. The horizontal distance between the inlet and exhaust terminations should be minimized, when possible, and should never exceed 24- inches.
  • Page 28 All installations and services must be performed by qualified service personnel. • where wetting of components by condensate, or water vapor, could be detrimental to the operation of pressure regulators, relief valves, or any other equipment. d. The vent terminal shall be installed a minimum of 14-inches from any obstruction and 3-feet from an inside corner of an L-shaped structure.

  • Page 29: Installation Of Outside Exhaust/Intake Terminations

    All installations and services must be performed by qualified service personnel. 4. Vent Terminal Location Guidelines : Bushes, shrubs, or any vegetation that may restrict the flow of flue products must be kept away from vent and air intake terminations. Terminations must also be kept clear of any leaves, weeds, combustible materials, snow, and ice build-up.
  • Page 30 All installations and services must be performed by qualified service personnel. Figure 10: Typical Construction Details of Sidewall Vent and Air Intake Terminations 3. Finish the vent installation by caulking the annulus to seal around the two (2) holes where the thermoplastic pipes pass through the wall. 4.
  • Page 31 All installations and services must be performed by qualified service personnel. The furnace may be vented vertically through the roof. The outlet/inlet of the vent and air intake terminations shall be a minimum of 12 inches above highest anticipated snow level. The vent outlet must be installed a minimum of 12 in. above the air intake inlet.

  • Page 32: Condensate Drain Line And Trap Assembly

    All installations and services must be performed by qualified service personnel. CEILING: Frame out area around where PVC pipe is to penetrate ceiling. Cut a 2-3/8” diameter hole for 2” PVC in the ceiling and a corresponding hole in a firestop to be made of a minimum of 18 gauge galvanized metal large enough to cover the entire framed area.

  • Page 33: Electrical Wiring

    All installations and services must be performed by qualified service personnel. L. ELECTRICAL WIRING All wiring shall be performed by a qualified electrician or service person. The wiring must comply with local codes, the instructions in this manual, and in the absence of codes with the National Electrical Code ANSI/NFPA-70 (LATEST EDITION).
  • Page 34 All installations and services must be performed by qualified service personnel. IMPORTANT: The room thermostat should be installed 4 to 5 feet above the floor on an interior wall which is relatively free from direct sources of heat (sunlight or supply airflow) or exposure to cold (drafts from open windows and doors).

  • Page 35: Blower Motor Speed Wiring

    All installations and services must be performed by qualified service personnel. 4. BLOWER MOTOR SPEED WIRING Figure 15. BLOWER DELAY SETTINGS To delay fan Set Switch turn-on by: 15 sec. 30 sec. 45 sec. * 60 sec. To delay fan Set Switch turn-off by: 60 sec.
  • Page 36 All installations and services must be performed by qualified service personnel. CMA3-50D36 ALTERATIONS REQ’D FOR A/C @ DESIGN EXTERNAL STATIC PRESSURE COOLING UNIT HTG Speed Recommended CLG Speed 24,000 MED-LOW 30,000 MED-HIGH 36,000 HIGH Furnace Airflow (CFM) vs. External Static pressure (in. WC.) Speed Tap \ Static Pressure...
  • Page 37 All installations and services must be performed by qualified service personnel. CMA3-75D36 ALTERATIONS REQ’D FOR A/C @ DESIGN EXTERNAL STATIC PRESSURE HTG Speed Recommended CLG Speed COOLING UNIT 24,000 MED-LOW MED-LOW 30,000 MED-LOW MED-HIGH 36,000 MED-LOW HIGH Speed Tap \ Furnace Airflow (CFM) vs.
  • Page 38 All installations and services must be performed by qualified service personnel. CMC1-50D36 ALTERATIONS REQ’D FOR A/C @ DESIGN EXTERNAL STATIC PRESSURE COOLING UNIT HTG Speed Recommended CLG Speed 24,000 MED-LOW 30,000 MED-HIGH 36,000 HIGH Furnace Airflow (CFM) vs. External Static pressure (in. WC.) Speed Tap \ Static Pressure...
  • Page 39 All installations and services must be performed by qualified service personnel. CMC1-75D36 ALTERATIONS REQ’D FOR A/C @ DESIGN EXTERNAL STATIC PRESSURE HTG Speed Recommended CLG Speed COOLING UNIT 24,000 MED-LOW MED-LOW 30,000 MED-LOW MED-HIGH 36,000 MED-LOW HIGH Speed Tap \ Furnace Airflow (CFM) vs.
  • Page 40 All installations and services must be performed by qualified service personnel. CMC1-50DV3 ALTERATIONS REQ’D FOR A/C @ DESIGN EXTERNAL STATIC PRESSURE COOLING UNIT HTG Speed Recommended CLG Speed 24,000 MED-LOW 30,000 MED-HIGH 36,000 HIGH Furnace Airflow (CFM) vs. External Static pressure (in. WC.) Speed Tap \ Static Pressure...
  • Page 41 All installations and services must be performed by qualified service personnel. CMC1-75DV3 ALTERATIONS REQ’D FOR A/C @ DESIGN EXTERNAL STATIC PRESSURE HTG Speed Recommended CLG Speed COOLING UNIT 24,000 MED-LOW MED-LOW 30,000 MED-LOW MED-HIGH 36,000 MED-LOW HIGH Speed Tap \ Furnace Airflow (CFM) vs.
  • Page 42 All installations and services must be performed by qualified service personnel. : TURN OFF THE ELECTRICAL POWER to the furnace before attempting to change blower speed wiring. The furnace is factory wired to the ignition control with standard heating and cooling speeds. When changing motor speeds, simply switch the needed speed to either the heating or cooling terminal as applicable on the module to obtain the desired CFM.

  • Page 43: Starting The Unit

    All installations and services must be performed by qualified service personnel. V. STARTING THE UNIT A. SEQUENCE OF OPERATIONS AT ANY TIME THE CONTINUOUS SAFE OPERATION CHECK GAS VALVE IS IF FLAME SIMULATION CONDITION NOT ENERGIZED PRESENT OR ROLL-OUT SWITCH OPENS, SYSTEM ENERGIZES INDUCER FAN FOR 15 SECONDS AND CIRCULATOR BLOWER AT HEATING SPEED UNTIL SITUATION CORRECTION START...
  • Page 44 All installations and services must be performed by qualified service personnel. AFTER DELAY-TO-FAN-ON THE RETRY SEQUENCE MAIN PERIOD ENDS, CIRCULATING PROVIDES A 60 SECOND BURNER AIR FAN IS ENERGIZED AT WAIT BEFORE IGNITION OPERATION HEATING SPEED. THE (OPTIONAL) RETRY. RETRY IS ELECTRONIC AIR CLEANER ATTEMPTED WITH AN AND HUMIDIFIER ARE...

  • Page 45: Initial Start-Up

    All installations and services must be performed by qualified service personnel. B. INITIAL START UP: This furnace does not have a pilot. It is equipped with a hot surface igniter which automatically lights the burner. Do not attempt to light the burner by hand. Check the following items before the initial start-up.

  • Page 46: Adjustment Of Btu Input Rate

    All installations and services must be performed by qualified service personnel. C. ADJUSTMENT OF BTU INPUT RATE: The orifice for this furnace was sized: 1) for natural gas having a heating value of 1025 BTU per cubic foot and a specific gravity of .65, or 2) for liquefied propane gas with a heating value of 2500 BTU per cubic foot and a specific gravity of 1.55.

  • Page 47: Burner Adjustment

    All installations and services must be performed by qualified service personnel. GAS PRESSURE CHART FOR CMA*/CMC* MODEL FURNACES SUPPLY PRESSURE MANIFOLD PRESSURE MAX 14” WC 3.5 + .3” WC MIN 4.5” WC MAX 14” WC PROPANE 10.0” + .3” WC MIN 11”...

  • Page 48: Setting Temperature Rise

    All installations and services must be performed by qualified service personnel. Figure 16. The CMA/CMC furnace models are direct vent design and do not require an air shutter adjustment (air shutters are not used) for proper flame characteristics. Burner box access cover must always be secured with all screws in place and tightened before operating furnace.

  • Page 49: Furnace Checkout Procedure

    All installations and services must be performed by qualified service personnel. F. FURNACE CHECKOUT PROCEDURE Before any system of gas piping is finally put into service, it shall be carefully tested to assure that it is gas tight as indicated in the Fuel Piping Section of this Furnace Manual.

  • Page 50: Installer's Instructions To User

    All installations and services must be performed by qualified service personnel. VI. INSTALLER'S INSTRUCTIONS TO USER: After completing the installation, the installer shall inform and/or demonstrate to the homeowner: 1. The location of all the instructions in the furnace and that the instructions must be kept along with instructions for any accessories in the plastic pouch.

  • Page 51: Electrical

    All installations and services must be performed by qualified service personnel. Label wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. A. ELECTRICAL: 1. Check diagnostic code through view port prior to removing access door. 2.

  • Page 52: Heat Exchanger

    All installations and services must be performed by qualified service personnel. necessary, clean the accessible portions of the housing and blower with a damp cloth. Vacuum to remove any lint or dust from the motor assembly. 5. GASKETS/SEALING MATERIALS Inspect all visible gaskets for signs of degradation or liquid seepage, especially any seals which were removed as part of the inspection.

  • Page 53: Troubleshooting

    All installations and services must be performed by qualified service personnel. assure proper furnace operation. Follow the cleaning, removal and replacement procedure below. FILTER MAINTENANCE PROCEDURE The filter is located inside front door of the CMA/CMC. Remove filter retaining rod and remove dirty filter.
  • Page 54 All installations and services must be performed by qualified service personnel. If the sensed failure is in the system (external to the control), the LED will flash in the following flash-pause sequences to indicate failure status (each flash will last approximately 0.25 seconds, and each pause will last approximately 2 seconds).
  • Page 55 All installations and services must be performed by qualified service personnel. TROUBLESHOOTING GUIDE THE SYSTEM IS STARTED BY SETTING THE THERMOSTAT TO CALL FOR HEAT. THE FOLLOWING SHOULD HELP ESTABLISH THE TYPE OF MALFUNCTION OR DEVIATION FROM THE NORMAL OPERATION. TO USE THIS DIAGRAM, YOU JUST NEED TO FOLLOW THE INSTRUCTIONS IN THE BOXES.
  • Page 56 All installations and services must be performed by qualified service personnel. IS THERE LINE VOLTAGE CHECK THE INTEGRATED ACROSS INDUCER POWER CONTROL DIAGNOSTIC LED TERMINALS "IND" & "IND N" LAMP. RESET BY INTERRUPTING AT THE INTEGRATED CONTROL? POWER TO CONTROL FOR MORE THAN ONE SECOND.
  • Page 57 All installations and services must be performed by qualified service personnel. AFTER GAS VALVE CHECK FOR PROPER ADJUST TO 3.5" FOR NATURAL GAS OPENS, DO THE MANIFOLD PRESSURE. OR 10.0" WC FOR LP GAS BURNERS IGNITE? IS IGNITOR REPOSITION TO POSITIONED CORRECTLY? CORRECT LOCATION.
  • Page 58 All installations and services must be performed by qualified service personnel. DOES SYSTEM RUN UNTIL IS LED LIGHT CHECK ALL THERMOSTAT IS SATISFIED? ON INTEGRATED WIRING FOR CONTROL FLASHING? LOOSE CONNECTIONS. DOES BURNER SHUT OFF CHECK FOR SHORT IN WIRE TO WHEN THERMOSTAT IS THERMOSTAT AND CORRECT SATISFIED?
  • Page 59 All installations and services must be performed by qualified service personnel. IF LED LIGHT FLASHES: 1 FLASH, THEN PAUSE SYSTEM LOCKOUT 2 FLASHES, THEN PAUSE PRESSURE SWITCH STUCK CLOSED 3 FLASHES, THEN PAUSE PRESSURE SWITCH STUCK OPEN 4 FLASHES, THEN PAUSE OPEN LIMIT SWITCH OR ROLLOUT SWITCH 6 FLASHES, THEN PAUSE 115 VOLT AC POWER REVERSED...

  • Page 60: Appendix-Areplacement Parts

    All installations and services must be performed by qualified service personnel. APPENDIX – A REPLACEMENT PARTS...
  • Page 61 All installations and services must be performed by qualified service personnel.
  • Page 62 All installations and services must be performed by qualified service personnel.
  • Page 63 All installations and services must be performed by qualified service personnel.

  • Page 64: Appendix-Bwiring Diagram

    All installations and services must be performed by qualified service personnel. APPENDIX – B WIRING DIAGRAMS...

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