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Manual Thermo Products CMA1-50N

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  • Thermo Products CMA1-50N - page 1

    GAS FIRED HIGH EFFICIENCY FURNACE DOWN FLOW & DIRECT VENT (SEALED COMBUSTION) MODEL: CMA1-50N & CMA2-75N 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 flammabl e vapors and ...

  • Thermo Products CMA1-50N - page 2

    TABLE OF CONTENTS SECTION BEGINNING PAGE I. SAFETY INFORMATION 1 II. FURNACE SPECIFICATIONS 6 III. GENERAL INSTRUCTIONS AND CLEARANCES 7 IV. GENERAL INSTALLATION 9 A. FURNACE LOCATION 9 B. BASE INSTALLATION 12 C. ALCOVE INSTALLATION 13 D . C L O S E T I N S T A L L A T I O N 1 4 E . F U E L P I P I N G 1 5 F. GENERAL VENTING REQUIREMENTS 16 G. CONN ...

  • Thermo Products CMA1-50N - page 3

    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. 1 ...

  • Thermo Products CMA1-50N - 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. 2 ...

  • Thermo Products CMA1-50N - page 5

    All installations and services must be performed by qualified service personnel. The following safety information should be read, understood, and followed by the installer. 1. Use only with type of gas approved for this furnace. Refer to furnace rating plate. 2. Do not install this furnace where it c ould be exposed to drafts or other wind or moist ...

  • Thermo Products CMA1-50N - page 6

    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 othe r combustible materials. Keep the vent hood clear of snow. Avoid locating the t ...

  • Thermo Products CMA1-50N - page 7

    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. Check with your gas supplier. : TURN OFF THE ELECTRICAL POWER to the furnace before attempting to c ...

  • Thermo Products CMA1-50N - page 8

    All installations and services must be performed by qualified service personnel. II. FURNACE SPECIFICATIONS - CMA SERIES MODEL CMA 1-50 CMA2-75 INPUT IN BTUH 50,000 75,000 OUTPUT IN BTUH 48,000 72,000 M AIN ORIFIC E-NA T. MA IN ORIFICE -LP GA S SUPPLY PRESSURE L.P. MIN IMU M NAT. M INIM UM L. P . MAX I MUM NA T . MAX I MUM GA S MANIFOLD PRESSURE L. ...

  • Thermo Products CMA1-50N - page 9

    All installations and services must be performed by qualified service personnel. INSTALLATION PARTS PACKAGE CMA*-50 CMA* -75 S00S4179 S00S4114 PART # QT Y PART # QT Y J-box cover 350020 1 350020 1 wire nut 300132 2 300132 2 3" stainless steel hose c l am p 300276 4 300276 4 2-3/8" radiator hose 410017 2 410017 2 CPVC adapter 320833 1 3208 ...

  • Thermo Products CMA1-50N - page 10

    All installations and services must be performed by qualified service personnel. accordance with the latest edition of the UL Standard for Single and Multiple Station Carbon Monoxide Alarms, UL 2034, or the CSA International Standard, Residential Carbon Monoxide Alarming Devises, CSA 6.19. 5. The installer shall be familiar with and comply with all ...

  • Thermo Products CMA1-50N - page 11

    All installations and services must be performed by qualified service personnel. MODELS CMA CLOSET ALCOVE FRONT BACK SIDES VENT CONNECTOR(PVC) TOP PLENUM SIDES TOP AND SIDES OF DUCT BOTTOM OF DUCT 6” 0” 0” 0” 0” 1” 1” 1” 18” 0” 0” 0” 0” 1” 1” 1” Table 1 This heating appliance must be installed wit h clearances not le ...

  • Thermo Products CMA1-50N - page 12

    All installations and services must be performed by qualified service personnel. Combustible Floor Base Model: 70-BASE F i g u r e 1 A . Coil Cabinet Model: CE113S Note: This cabinet cannot be utilized as a cottage base. Figure 1B. 10 ...

  • Thermo Products CMA1-50N - page 13

    All installations and services must be performed by qualified service personnel. Cottage Base Model: 01COT-BASE Figure 1C. NOTE: Serves as a plenum for single story applications with exposed supply air systems. 11 ...

  • Thermo Products CMA1-50N - page 14

    All installations and services must be performed by qualified service personnel. B. BASE INSTALLATION 1. Combustible Floor Base Model: 70 BASE Use the base bottom panel as a template to mark floor opening locations (see Figure 2). Cut a square opening in the floor for the supply air connector duct. Cut the opening 1-inch larger than the square temp ...

  • Thermo Products CMA1-50N - page 15

    All installations and services must be performed by qualified service personnel. connector duct. Remove the bottom panel. Cu t an opening in the distribution duct slightly larger than the connector duct. (refer to Figure 2 for location of this cut.) Cut the connector duct to length. Install the connector duct. Bend over each tab. Insure an airtight ...

  • Thermo Products CMA1-50N - page 16

    All installations and services must be performed by qualified service personnel. D. CLOSET INSTALLATION 1. The return air opening into the closet is to have a minimum free area of 250 sq. in. (see Figure 5). 2. The return air opening may be located in the top, center or (ideally) bottom of the closet door or side wall. F i g u r e 5 . : Do not obst ...

  • Thermo Products CMA1-50N - page 17

    All installations and services must be performed by qualified service personnel. E. FUEL PIPING Sizing and installation of fuel lines must be in accordance with Federal, State & Local regulations. Including the Nati onal Fuel Gas Code NFPA 54/ANSI-Z233.1 (Latest Edition). NOTE: These furnaces are designed to be gas piped through the left side o ...

  • Thermo Products CMA1-50N - page 18

    All installations and services must be performed by qualified service personnel. : 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. GENERAL VENTING REQUIREMENTS The CMA furnace venting system must be installed by a qualified ...

  • Thermo Products CMA1-50N - page 19

    All installations and services must be performed by qualified service personnel. MAXIMUM VENT LENGTH VENT SIZE 2 IN. PVC FURNACE MODEL VENT LENGTH (FT.) EXHAUST VENT ELBOWS (NO.) COMBUSTION AIR INTAKE ELBOWS (NO.) CMA 30 8* 7** *Note the drain elbow supplied with CMA furnaces count as 1 elbow. **Note the two 45 ° elbows supplied w/CMA furnace coun ...

  • Thermo Products CMA1-50N - page 20

    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 furnace. Figure 6. (CMA*-75 SHOWN) NOTICE: The exhaust vent pipe must be supported every 4 feet. After making sure the length ...

  • Thermo Products CMA1-50N - page 21

    All installations and services must be performed by qualified service personnel. NOTICE: The furnace model series CMA may be vented either through the sidewall or the roof. For sidewall instructions, continue to the following section. For roof venting, refer to Section IV J, of this manual. NOTICE: The air intake pipe must be support ed every 4 fee ...

  • Thermo Products CMA1-50N - page 22

    All installations and services must be performed by qualified service personnel. Figure 7: Proper Direct Vent Termina tions (RH & LH views) and Vent Termination Only w/o Outside Combustion Air Intake (RH view) NOTICE: If exterior sidewall building ma terials are subject to degradation from contact with flue gases or moisture, a minimum 24-inch ...

  • Thermo Products CMA1-50N - page 23

    All installations and services must be performed by qualified service personnel. Figure 8: Typical Relative Locations of Direct Vent Terminations When Sidewall Venting 3. Exhaust Vent Terminal Location Clearance Requirements a. The vent terminal shall be located at least 3-feet above any forced air inlet located within 10-feet. Refer to Figure 9 fo ...

  • Thermo Products CMA1-50N - page 24

    All installations and services must be performed by qualified service personnel. Figure 9: NFGC Minimum Clearances Between the Vent Terminal and Various Building Features 22 ...

  • Thermo Products CMA1-50N - page 25

    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 ...

  • Thermo Products CMA1-50N - page 26

    All installations and services must be performed by qualified service personnel. inlet as shown in Figure 10, making sure that the spacing between the inlet and outlet complies with that noted in Figure 8. Figure 10: Typical Construction Details of Sidewall Vent and Air Intake Terminations 3. Finish the vent installation by caulking the annulus to ...

  • Thermo Products CMA1-50N - page 27

    All installations and services must be performed by qualified service personnel. 3. Place second flashing plate on roof over existing hole. 4. Plate must be sealed to roof to ensure a weather proof seal. 5. Secure plate to roof. 6. Drop pvc pipes thru holes in flashing plates. 7. Secure with hose clamps to flashing plate. 8. Seal with silicone type ...

  • Thermo Products CMA1-50N - page 28

    All installations and services must be performed by qualified service personnel. When the PVC vent and combustion air intake pipes pass through a ceiling, and a fire stop is required. Refer to the following: 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 correspo ...

  • Thermo Products CMA1-50N - page 29

    All installations and services must be performed by qualified service personnel. 3. An optional condensate pump (P/N 350225) is available. This pump will not fit into the vestibule of the furnace and mu st be installed below the furnace for operation. Instructions will be included wit h pump if this option is utilized. Figure 14. L. ELECTRICAL WIRI ...

  • Thermo Products CMA1-50N - page 30

    All installations and services must be performed by qualified service personnel. NOTE: Class 1 thermostat wire must be used inside the furnace burner compartment. a. Insert 24 VAC wires through the plastic grommet on the left side of the furnace casing. b. Connect the thermostat wires to the W/R 50A65-143 control (refer to the wiring diagram). c. C ...

  • Thermo Products CMA1-50N - page 31

    All installations and services must be performed by qualified service personnel. mounted junction box. The hot leg must pass through the disconnect switch in all cases to prevent the hazard of electrical shock when servicing. IMPORTANT: The furnace must be grounded in accordance with local codes and with the National Electrical Code, ANSI/NFPA NO. ...

  • Thermo Products CMA1-50N - page 32

    All installations and services must be performed by qualified service personnel. CMA1-50 ALTERA TIONS REQ’D FOR A /C @ DESIGN EXTERNA L STA TIC PRESSURE COOLING UNIT HTG Speed Recommended CLG Speed 24,000 LOW MED-LOW 30,000 LOW MED-HIGH 36,000 LOW HIGH Furnace Airflow (CFM) vs. External Static pressure (in. WC.) Speed Tap Static Pressure 0.1 0. ...

  • Thermo Products CMA1-50N - page 33

    All installations and services must be performed by qualified service personnel. CMA2-75 ALTERA TIONS REQ’D FOR A/C @ DESIGN EXTERNA L STATIC PRESSURE COOLING UNIT HTG Speed Recommended CLG Speed 24,000 MED-LOW MED-LOW 30,000 MED-LOW MED-HIGH 36,000 MED-LOW HIGH Furnace Airflow (CFM) vs. External Static pressure (in. WC.) Speed Tap Static Press ...

  • Thermo Products CMA1-50N - page 34

    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 i gnition control with standard heating and cooling speeds. When changing motor speeds, simply switch the needed speed to either the heat ...

  • Thermo Products CMA1-50N - page 35

    All installations and services must be performed by qualified service personnel. V. STARTING THE UNIT A. SEQUENCE OF OPERATIONS START TRIAL FOR IGNITION CONTINUOUS SAFE OPERATION CHECK IF FLAME SIMULATION CONDITION PRESENT OR ROLL-OUT SWITCH OPENS, SYSTEM ENERGIZES INDUCER FAN FOR 15 SECONDS AND CIRCULATOR BLOWER AT HEATING SPEED UNTIL SITUATION CO ...

  • Thermo Products CMA1-50N - page 36

    All installations and services must be performed by qualified service personnel. MAIN BURNER OPERATION END OF CYCLE CALL FOR HEAT SATISFIED AFTER DELAY-TO-FAN-ON PERIOD ENDS, CIRCULATING AIR FAN IS ENERGIZED AT HEATING SPEED. THE (OPTIONAL) ELECTRONIC AIR CLEANER AND HUMIDIFIER ARE ENERGIZED. AFTER THE DELAY-TO- FAN-OFF PERIOD ENDS, THE CIRCULATING ...

  • Thermo Products CMA1-50N - page 37

    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. 1. Check all wiring for loose c ...

  • Thermo Products CMA1-50N - page 38

    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 gravit y of .65, or 2) for liquefied propane gas with a heating value of 2500 BTU per c ubic foot and a spec ifi ...

  • Thermo Products CMA1-50N - page 39

    All installations and services must be performed by qualified service personnel. GAS PRESSURE CHART FOR CMA* MODEL FURNACES SUPPLY PRESSURE MANIFOLD PRESSURE NAT MAX 14” WC MIN 4.5” WC 3.5 + .3” WC PROPANE MAX 14” WC MIN 11” WC 10.0” + .3” WC TABLE 3 This gas furnace is equipped with a fixed orifice sized for the manifold pressure sho ...

  • Thermo Products CMA1-50N - page 40

    All installations and services must be performed by qualified service personnel. flames should be clear, blue and almost tr ansparent in color. (see Figure 16). NOTE: It is not unusual to have orangish flames visible in the tube for LP gas. Figure 16. : The CMA furnace models are direct vent design and do not require an air shutter adjustment (a ir ...

  • Thermo Products CMA1-50N - page 41

    All installations and services must be performed by qualified service personnel. control, with one of the higher speed blower leads attached to a terminal marked “Park”. Be sure to attach any unused blower leads to a terminal marked “Park”. Replace the blower door and turn on the power supply. F. FURNACE CHECKOUT PROCEDURE Before any system ...

  • Thermo Products CMA1-50N - page 42

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

  • Thermo Products CMA1-50N - page 43

    All installations and services must be performed by qualified service personnel. A. ELECTRICAL: 1. Check diagnostic code through view port prior to removing access door. 2. Check all wiring for loose connecti ons and any signs of damage or unusual wear. 3. Check for correct voltage at the furnace when operating. 4. Check amp-draw on blower motor an ...

  • Thermo Products CMA1-50N - page 44

    All installations and services must be performed by qualified service personnel. 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. Replace any suspect gaskets. C. HEAT EXCHANGER Inspect for corrosion, pitting, warpage, deterioration ...

  • Thermo Products CMA1-50N - page 45

    All installations and services must be performed by qualified service personnel. FILTER MAINTENANCE PROCEDURE The filter is located inside front door of the CMA. Remove filter retaining rod and remove dirty filter. Clean the filter by va cuuming, rinsing with tap water, hosing or dipping in an ordinary detergent solution. After cleaning, replace th ...

  • Thermo Products CMA1-50N - page 46

    All installations and services must be performed by qualified service personnel. 3 flashes, then pause pressure switch stuck open 4 flashes, then pause open high limit switch 6 flashes, then pause 115 volt AC power reversed 7 flashes, then pause low flame sense signal 8 flashes, then pause check ignitor or improper grounding Continuous flashing Fla ...

  • Thermo Products CMA1-50N - page 47

    All installations and services must be performed by qualified service personnel. TURN THERMOSTAT TO CALL FOR HEAT DOES THERMOSTAT MAKE CONTACT? IS ROOM TEMPERATURE BELOW THERMOSTAT SETTING? IS ROOM TEMPERATURE ABOVE 90 DEGREES F? TURN T'STAT SETTING ABOVE ROOM TEMP. COOL THE THERMOSTAT IS THE TRANSFORMER SUPPLYING 24 VOLTS TO THE THERMOSTAT? R ...

  • Thermo Products CMA1-50N - page 48

    All installations and services must be performed by qualified service personnel. CHECK WIRING TO INDUCER AND IF OK, REPLACE INDUCER ASSEMBLY. AFTER HOT SURFACE IGNITOR WARM-UP, DOES GAS VALVE OPEN? CHECK WIRING TO HOT SURFACE IGNITOR AND IF OK, REPLACE HOT SURFACE IGNITOR ASSEMBLY. Yes Yes No Yes Yes Yes Yes Yes CHECK WIRING TO GAS VALVE AND IF OK, ...

  • Thermo Products CMA1-50N - page 49

    All installations and services must be performed by qualified service personnel. CHECK FOR PROPER MANIFOLD PRESSURE. No Yes Yes Yes AFTER GAS VALVE OPENS, DO THE BURNERS IGNITE? ADJUST TO 3.5" FOR NATURAL GAS OR 10.0" WC FOR LP GAS IS IGNITOR POSITIONED CORRECTLY? REPOSITION TO CORRECT LOCATION. DO BURNERS STAY LIT PAST PROOF OF FLAME CHE ...

  • Thermo Products CMA1-50N - page 50

    All installations and services must be performed by qualified service personnel. 48 DOES SYSTEM RUN UNTIL THERMOSTAT IS SATISFIED? CHECK ALL WIRING FOR LOOSE CONNECTIONS. CHECK FOR SHORT IN WIRE TO THERMOSTAT AND CORRECT IF NECESSARY. DOES BURNER SHUT OFF WHEN THERMOSTAT IS SATISFIED? No DOES THE CIRCULATING AIR BLOWER TURN OFF AFTER THERMOSTAT IS ...

  • Thermo Products CMA1-50N - page 51

    All installations and services must be performed by qualified service personnel. Yes TROUBLESHOOTING COMP LETE. Yes 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 PAU ...

  • Thermo Products CMA1-50N - page 52

    All installations and services must be performed by qualified service personnel. APPENDIX – A REPLACEMENT PARTS 50 ...

  • Thermo Products CMA1-50N - page 53

    All installations and services must be performed by qualified service personnel. All installations and services must be performed by qualified service personnel. 51 51 ...

  • Thermo Products CMA1-50N - page 54

    All installations and services must be performed by qualified service personnel. APPENDIX – B WI RING DIAGRAM 52 ...

  • Thermo Products CMA1-50N - page 55

    All installations and services must be performed by qualified service personnel. 53 ...

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