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For operation at elevations above 2,000 feet (600 m), equipment ratings shall be reduced at the rate of 4 percent for each 1,000 feet (300 m) above sea level. For additional information, refer to the latest edition of the National Fuel Gas Code. Checking The Burner Flame .. CAUTION: The furnace model series CDX1 and CHX1 are sealed combustion designs that do not require an air shutter adjustment (air shutters are not used) for proper flame characteristics. The burner box access cover must always be secured with all screws in place and tightened before operating furnace. Once the input rate has been confirmed correct for a specific application, the burner flames should be checked for proper adjustment. 37 All installations and services must be performed by qualified service personnel. This furnace is designed not to require any burner adjustment. Burner aeration is fixed in this design. Burner flames can be seen by looking through the sight glass located on the burner box. Burner flames should be well-defined, light to medium blue in color, and almost transparent. (refer to Figure 24). Figure 24: Sketch of Typical Main Burner Flames During Operation NOTICE: When operating on propane gas, it is not unusual for flames to have yellow or orange colored tips. If combustion problems are evident, it may indicate problems with either the furnace air supply or the vent system. Refer to the installation and maintenance sections of this manual, or contact Thermo Products at (574) 896-2133. Checkout Procedure 1. Confirm the furnace exhaust vent and combustion air intake are constructed as outlined in the installation and service manual. They must not be blocked or otherwise obstructed. 2. Place system in operation and observe at least one (1) complete cycle to ensure all controls are operating properly. The main burner must light reliably under all conditions. 3. Perform gas leakage test on all gas pipe connections and pressure tap plugs. 38 All installations and services must be performed by qualified service personnel. TIME (sec.) FLOW (cfh) TABLE 6 - CONVERTING GAS FLOW RATE 40 90 41 88 * For one cubic foot per revolution gas meter dials, 42 86 use Table directly. 44 82 45 80 * For 1/2 cubic foot per revolution gas meter dials: 46 78 1. Determine time for two dial revolutions 47 77 2. Use Table directly 48 75 49 73 * For two cubic foot per revolution gas meter dials: 50 72 1. Determine time for one complete dial revolutions 51 71 2. Divide time by two 52 69 3. Use Table directly 53 68 54 67 55 65 56 64 57 63 58 62 59 61 60 60 62 58 64 56 66 54 68 53 70 51 72 50 74 49 76 47 78 46 80 45 84 43 88 41 92 39 96 38 100 36 105 34 110 33 115 31 120 30 125 29 130 28 135 27 140 26 150 24 160 23 170 21 180 20 39 All installations and services must be performed by qualified service personnel. C. 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 manual. NOTICE: All controls on the unit should be checked for proper functioning prior to the qualified service personnel leaving the job site. Specifically the following should be checked: With furnace in normal heating operation, check to make certain blower will start and stop automatically under control of integrated fan control. 1. Check safety limit control as follows: a. Shut off incoming power. b. Disconnect blower motor leads. c. Restore power to furnace. d. Set thermostat above room temperature calling for heat. e. When temperatures are reached in furnace at limit control setting with blower out of operation, burner should shut off. f. Shut off electrical power. IMPORTANT: Remove blockage or reconnect blower motor and restore power. 2. Make certain thermostat will automatically start and stop furnace. 3. Block the flue pipe gradually with a flat piece of metal, until the pressure switch functions shutting off the main burners. Note: If the burner was initially operating in high fire, the burner will first reduce rate to the low fire setting. As the flue becomes more blocked, the pressure switch will function and completely shut off the main burners. 4. Block the PVC pipe inlet gradually with a flat piece of metal until pressure switch functions shutting off the main burners. Note: If the burner was initially operating in high fire, the burner will first reduce rate to the low fire setting. As the flue becomes more blocked, the pressure switch will function and completely shut off the main burners. IMPORTANT: Remove flue air inlet blockage when done. 5. Remove the blower compartment access door with the furnace operating. The door interrupt switch is in the 120 volt circuit and will shut down the entire system. Replace the blower door and the furnace start-up cycle will begin. V. 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...

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