Assessments - 3, GPA: 3.7
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Operation is shown in Table 4. TROUBLESHOOTING AND MAINTENANCE IMPORTANT: Due to the potential hazard of line voltage, only a trained, experienced service technician should perform the troubleshooting procedure. This control contains no field-serviceable parts. Do not attempt to take it apart. Replace entire control if operation is not as described. To completely troubleshoot an oil burner installation, check the burner and oil primary control for proper operation and condition. The indicator light on the oil primary control provides lockout, recycle and cad cell indications as follows: 69-1233—2 4 R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY . Flashing at 1 Hz (1/2 second on, 1/2 second off): 3. On: cad cell is sensing flame. system is locked out or in restricted mode. 4. Off: cad cell is not sensing flame. 2. Flashing at 1/4 Hz (2 seconds on, 2 seconds off): control is in recycle mode. VALVE ON DELAY TIME: 15 SEC. (FIXED) 1 21 2 1 ONONONON 21 2 33 DELAY TIMES:BURNER MOTOR OFF DELAY TIME: 0 MIN. 2 MIN. 4 MIN. 6 MIN. ENABLED DISABLED (SHADED AREA IS SWITCH HANDLE POSITION) M17535 Fig. 8. Switch settings for burner-off delay times. Table 2. Switch Settings and Delays. Delay Timings Valve-On Delay (seconds) Burner Motor-Off Delay (minutes) S-1 R7184U R7184P 0 0 — X 15 0 0.5 Off 15 2 2 Off 15 4 4 On 15 6 8 OnX Off On Off On DIP Switch Settings S-2 S-3 Enable/Disable R7184U R7184P Off + On + On + On + On + X = Don’t Care. + = S-3 not provided on R7184P models. Cad Cell Resistance Check For proper operation it is important that the cad cell resistance is below 1600 ohms. During a normal call for heat, once the control has entered the Run mode, press and release the reset button. Indicator light will flash 1 to 4 flashes. See Table 3 for equivalent cad cell resistance. Table 3. Cad cell resistance when sensing flame. Flashes 1 2 3 4 Cad Cell Resistance in ohms Less than 400 More than400 and less than 800 More than 800 and less than 1600 More than 1600 and less than 5000 Preliminary Steps 1. Check wiring connections and power supply. 2. Make sure power is on to the controls. 3. Make sure limit control is closed. 4. Check contacts between ignitor and the electrodes. 5. Check the oil pump pressure. 6. Check the piping to the oil tank. 7. Check the oil nozzle, oil supply and oil filter. Check Oil Primary Control If the trouble is not in the burner or ignition hardware, check the oil primary control by using the following equipment: 1. Screwdriver. 2. Voltmeter (0 to 150 Vac). 3. Insulated jumper wire with both ends stripped. WARNING Electrical Shock Hazard. Can cause serious injury or death. Troubleshoot with the system powered. Be careful to observe all precautions to prevent electrical shock or equipment damage. Refer to Table 4 for further troubleshooting information. 5 69-1233—2 R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY External Action R7184 Action Power applied to control. Internal safety check conducted. If no light or flame is detected and all internal conditions are correct, control enters Idle mode. Thermostat or Aquastat® Control calls for heat. 1. Shorts across T-T terminals (on as call for heat) in warm air system and/or provides power to limit terminals in hydronic system. 2. Safety Period (4 seconds) internal and external check for flame or light. If flame or light is detected, control remains in Idle mode. 3. When flame or light is not present: a. R7184A,U (if valve-on delay is disabled) will apply power to the burner motor and ignitor. b. R7184B,P,U (if valve-on delay is enabled) will apply power to the burner motor and ignitor, enter/complete valve-on delay period and then apply power to the valve. 4. Control enters Trial for Ignition period. a. Monitors burner for flame. b. When flame is not detected: (1) Enters lockout mode (after lockout time of 15, 30 or 45 seconds). (2) Shuts off valve, ignitor and burner motor. (3) Flashes indicator light at 1 Hz (1/2 second on, 1/2 second off). (4) Depress reset button to return to power up sequence. c. When flame is detected, Carry-Over period begins: 5. Control enters Ignition Carry-Over period (continues to spark for 10 to 30 seconds). a. Turns on indicator light. b. If flame is lost and lockout time has not expired, R7184 returns to Trial for Ignition period. c. If flame is lost and lockout time has expired, R7184 enters Recycle Mode. 6. Carry-Over time expires; ignitor turns off. 7. Enters Run Mode: a. Flame is monitored until call for heat ends or flame is lost. If flame is lost: (1) Control enters Recycle Mode. (2) Recycle time starts (60 seconds). (3) Burner and valve are turned off. (4) Indicator light flashes at 1/4 Hz (2 seconds on, 2 seconds off). (5) Returns to Idle mode at end of Recycle mode. Call for heat is satisfied. 1. R7184A,U (if burner motor-off delay is disabled): a. Burner motor and oil valve shut off. b. Indicator light turns off. 2...
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