Évaluations - 4, GPA: 4.3 ( )

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(Seal with RTV silicone when finished conducting combustion analysis). BURNER ADJUSTMENT 1) Operate burner for 15 minutes before conducting test work. 2) Adjust burner settings until a trace (0-1 on a smoke scale of 10) is obtained with smoke test pump. 3) Read C02%. This should be approximately 13.0%. 4) Increase air to burner to reduce C02% 1.0 to 1.5% less than where you were able to obtain a trace of smoke. This procedure allows a margin ofreserve for variable conditions. 5) Re-check smoke to insure it is O. Your final C02% should be approximately 11.5% Check vent stack temperatures as below: M 0 D E L APPROX. AMBIENT PLUS STACK TEMP F. INPUT RATE THERMAL EFFICIENCY 50 20-24 58,000 97-99% 75 27-31 82,000 95-97% 100 29-33 100,000 94-96% 125 38-42 115,000 92-94% Temperature Rise Temperature rise must be within the range below. An incorrect temperature rise may result in condensing in or overheating of the heat exchanger. Determine and adjUst temperature rise as follows: Model Temp. F. Degree Rise 50-2.5 50-60 75-2.5 55-65 100-2.5 60-70 50-5 30-40 75-5 35-45 100-5 45-55 125-5 50-60 1. Operate furnace with burner firing for approXimately ten minutes. Ensure all registers are open and all duct dampers are in their final (fully or partially open) position. 2. Place thermometers in the return and supply ducts as close to the furnace as possible. Thermometers must not be influenced by radiant heat by being able to "see" the heat exchanger HEAT EXCHANGER RADIATION "LINE OF SIGHT" ~ SUPPLY L..,/ AIR iT'U"" Temperature Rise Measurement 3. Subtract the return air temperature from the supply air temperature to determine the air temperature rise. Allow adequate time for thermometer readings to stabilize. 4. Adjust temperature rise by adjusting the circulator blower speed. Increase blower speed to reduce temperature rise. Decrease blower speed to increase temperature rise. Set thermostat heat anticipator setting at 0.2 A as a base point. Operate furnace and measure anticipation amperage and adjust thermostat to manufacturer's instructions. CIRCULATOR BLOWER SPEEDS This furnace is equipped with a mUlti-speed circulator blower. This blower provides ease in adjusting blower speeds. These blower speeds should be adjusted by the installer to match the installation requirements so as to provide the correct heating temperature rise and correct cooling CFM. To adjust the circulator blower speed, proceed as follows: 1. Turn OFF power to the furnace. 2. Relocate desired motor leads to the circulator blower terminals on the terminal block as required. 3. Turn ON power to furnace. 4. Verify proper temperature rise as outlined in Section XIV, Startup Procedure and Adjustment -Temperature Rise. 18 Circulator Blower Speeds Low Red Medium Blue Hiah Black Common/Neutral White XII. NORMAL SEQUENCE OF OPERATION POWER UP MODE The normal power up sequence is as follows: • 115 VAC power applied to furnace • Furnace awaits call from thermostat HEATING MODE The normal operational sequence in heating mode is as follows: • Rand W thermostat contacts close, initiating a call for heat Closure of the thermostat switch through relay #1 energizes primary control on the burner. Primary control goes in the pre-purge cycle, runs for 15 seconds and then goes into ignition sequence, burner ignites. Blower operation is controlled by Blower Delay "On-Oft" Control Relay, mounted in control panel face of blower. With factory setting (DELAY ON MAKE) of (30 sec), approximately 30 seconds after burner ignites, blower relay energizes to run comfort blower in the heating speed mode. NOTE: Blower speed (heating) is factory set on high speed. THERMOSTAT SATISFIED When the thermostat satisfied, heat contact opens through relay No.1, primary control relay drops out, which de-energizes the primary control. Burner goes into post-purge cycle, and then shuts off. With factory setting (DELAY ON BREAK) of 600 seconds, comfort blower continues to run for approximately 390-600 seconds after burner is satisfied. FAN ONLY MODE The normal operational sequence in fan only mode is as follows: • Rand G thermostat contacts close, initiating a call for fan • Circulator blower is energized • Circulator blower runs • Rand G thermostat contacts open, completing the call for fan • Circulator blower is de-energized • Furnace awaits next call from thermostat COOLING MODE When the heat-cool switch is in the cool position, and the thermostat calls for cooling, 24 volts AC at C and Y will complete the circuit to contactor in condensing unit. XIII. TROUBLESHOOTING IMPORTANT: DUE TO THE POTENTIAL HAZARD OF LINE VOLTAGE, ONLY A TRAINED, EXPERIENCED SERVICE TECHNICIAN SHOULD PERFORM THE TROUBLESHOOTING PROCEDURE. PRELIMINARY STEPS: Check the diagnostic light for indications of burner condition. Refer to R7184 LED Diagnostic Light section for details. CAUTION! When simulating a call for heat at the R7184, disconnect at least one thermostat lead wire from the T -T/3 terminals to prevent damage to...

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