Terminal designations Without valve proving Proprietary and Confidential...
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Terminal designations With valve proving Proprietary and Confidential...
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Wiring base Common to Siemens LFL The wiring base is common with the Siemens LFL and the BurnerPRO is listed to function as a drop-in replacement for the LFL. Three common neutral and three common grounding terminals are provided for use in connecting external devices.
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Wiring base Grounding leash The BurnerPRO is grounded using a quick-disconnect plug on a wired grounding leash. This provides a more positive ground over a copper spring, which can lose contact over time. Proprietary and Confidential...
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Smart LEDs DEMAND RESET BUTTON DAMPER OPEN DAMPER CLOSED OR ECONOMY AUTO MODE IGNITION FLAME DETECTED STATUS Proprietary and Confidential...
Sequence of operation Standby LED STATE The standby state is when there is not a call for heat. Terminal 11 (ACTUATOR ECONOMY OUTPUT) is powered with line voltage in this state. Proprietary and Confidential...
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Sequence of operation Lockout LED STATE When in the lockout state, the combination of LEDs will indicate the lockout code. These codes can be found in the bulletin for the specific model. Shown is the lockout code for STANDBY FALSE FLAME (flame detected while in standby for more than 60 seconds).
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Sequence of operation Lockout reset methods A lockout condition can be reset by either pressing the reset button on the control, or by applying line voltage to terminal 21 (REMOTE LED STATE RESET INPUT). Proprietary and Confidential...
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Sequence of operation Manual lockout A lockout condition can be manually initiated by either pressing the reset button on the control or by providing voltage to terminal 21. The lockout LED STATE code (shown here) indicated REMOTE RESET INPUT as the source of the lockout.
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Sequence of operation Call for heat input Terminal 4 provides line voltage that is used to power the operating limit string. After passing through all the limits in series, line voltage is applied to terminal 5 to indicate that the limits are complete and that there is a call for heat. Proprietary and Confidential...
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Sequence of operation Call for heat, checking air switch and POC LED STATE When there is a call for heat, voltage must be detected on both terminals 12 (PROOF OF CLOSURE INPUT) and terminal 13 (AIR SWITCH NC INPUT) within 60 seconds. Failure of either input to prove in time will result in a lockout.
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11 (ACTUATOR ECONOMY OUTPUT) is no longer powered. Instead, terminal 9 (ACTUATOR HIGH ALTERNATE FIRE OUTPUT) is powered instead as the BurnerPRO is commanding the actuator to the purge position. The LEDs for actuator open and actuator closed will alternate as the control waits for feedback on terminal 8 (ACTUATOR FEEDBACK INPUT).
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(timing t11). The count begins when feedback is received to indicate that the actuator is at the high fire position for purging. The BurnerPRO will lockout if this input is not proven within the specified duration. Proprietary and Confidential...
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Sequence of operation Purge LED STATE When feedback is received to confirm that the actuator is at the purge position, input must be received from the air switch on terminal 14 (SAFETY LIMIT INPUT) within the actuator travel time duration (timing t11). If the fan LED is blinking, the control is waiting for this input.
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Sequence of operation CHECK MODE – purge LED STATE Check mode can be applied to hold the burner in purge. To do so, press and hold the reset button until the status LED changes from green to amber. The fan LED will also blink while in check mode.
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Sequence of operation Driving actuators to ignition LED STATE After the purge timing is complete, the BurnerPRO will drive the actuator to the ignition position. The output for terminal 9 (ACTUATOR HIGH FIRE OUTPUT) is no longer powered. Instead, terminal 10 (ACTUATOR LOW FIRE OUTPUT) is powered instead as the BurnerPRO is commanding the actuator to the ignition position.
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Sequence of operation Ignition LED STATE When the ignition position is reached, terminal 16 (IGNITION OUTPUT) is powered for the duration of timing t3’ before the pilot output is energized. Proprietary and Confidential...
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Sequence of operation Pilot trial for ignition (PTFI) LED STATE After timing t3’ ends, the state will change to PTFI. PTFI will last for the duration of timings TSA’ plus t7, and a flame signal must be detected during PTFI. The flame signal can be from either the UV flame detector input or from the flame rod input.
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Sequence of operation Check mode – PTFI LED STATE Check mode can be applied to hold the burner in PTFI. To do so, press and hold the reset button until the status LED changes from green to amber. The fan LED will also blink while in check BLINK mode.
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Sequence of operation Main trial for ignition (MTFI) LED STATE After timing t7 ends, the state will change from MTFI to PTFI. MTFI will last for the duration of timing t5. Terminal 16 (IGNITION OUTPUT) is not energized during PTFI. Terminal 17 (PILOT OUTPUT) will remain energized for the duration of timing t9.
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After timing t5 ends, the control transitions from MTFI to AUTO. In auto, the actuator is no longer commanded by the BurnerPRO and can modulate or mode independently if needed to maintain the connected load. The control will remain in auto until there is no longer a call for heat (loss of voltage on terminal 5) or if there is a lockout condition.
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LED STATE It is possible to check the flame signal in AUTO. The procedure is the same as outlined for placing the BurnerPRO into check mode during PTFI (press and hold the reset button until the status BLINK LED changes from green to amber). The fan LED...
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Sequence of operation Postpurge LED STATE Upon a loss of the call for heat, the control will postpurge for the duration of timing t6. During postpurge, terminals 18 and 19 (UPSTREAM and DOWNSTREAM MIAN OUTPUT) are de-energized. Terminals 6 and 7 (FAN OUTPUT) remain energized until the end of postpurge.
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Wiring Disable proof of closure check Place a wire jumper from terminal 5 to terminal 12 to disable checking the proof of closure switches. This satisfies the check by applying line voltage to terminal 12 from the call for heat input. Proprietary and Confidential...
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Wiring Disable air switch check Place a wire jumper from terminal 11 to terminal 13 to disable the air switch check. This is the check to verify that the air switch is changing states between cycles. This satisfies the check by using the line voltage that is provided by terminal 11 while in standby (to send the actuator to the economy position) to indicate that the air switch normally closed switch position has power.
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Wiring Disable actuator usage Place a wire jumper from terminal 5 to terminal 8 to disable checking actuator feedback. This is the check to verify that the actuator is moving to the required positions. This satisfies the check by using the line voltage at terminal 5 to indicate constant feedback.
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Applying voltage to terminal 15 at the beginning of the cycle (when terminal 13 is powered) indicates to the BurnerPRO to truncate the prepurge to a minimal time (effectively no prepurge). Note that this only applies when valve proving is not used as terminal 15 is used for the valve proving switch input on those models.
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Applying voltage to terminal 15 at the end of the cycle (when terminal 14 is powered) indicates to the BurnerPRO to truncate the postpurge to a minimal time (effectively no prepurge). Note that this only applies when valve proving is not used as terminal 15 is used for the valve proving switch input on those models.
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Applying voltage to terminal 15 at the beginning and end of the cycle (terminal 4 is always powered) indicates to the BurnerPRO to truncate both the prepurge and postpurge to a minimal time (effectively no purges). Note that this only applies when valve proving is not used as terminal 15 is used for the valve proving switch input on those models.
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Wiring Overlapping outputs Certain outputs can be grouped to overlap timings. For example, an interrupted (non-continuous) pilot is connected to terminal 17 alone (PILOT OUTPUT). For an intermittent (continuous) pilot, jumper terminals 17 (PILOT OUTPUT) and 18 (UPSTREAM MAIN OUTPUT) to combine the timings of the two outputs. This means the pilot will remain energized from the start of PTFI until the sequence ends.
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Wiring Modbus models BurnerPRO models that end in “-SxM” have Modbus connectivity as a standard feature. This is available from the onboard RJ45 connector provided. Standard timings are offered (i.e., S1 through S6), but all timings can be customized using the Config Wizard for BurnerPRO software.
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A pressure switch is piped between these gas valves and the contact is connected to terminal 15. The BurnerPRO does a valve proving test at either prepurge or postpurge, depending upon what is configured. When using valve proving, terminal 12 is used for the normally closed position of the valve proving switch, so it can’t be used for checking the proof of closure inputs.
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Valve proving Method Valve proving can be programmed to occur either at the beginning of the sequence (before the prepurge) or at the end of the sequence (after postpurge). In either case, the valve proving test consists of the same steps. In the following diagrams, blue represents gas is present, red indicates the valve is closed or the switch is in the normally closed state and green indicates the valve is open or the switch is in the normally open state.
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Valve proving Evacuation The first step is the evacuation. The downstream valve is opened so any gas that was present in between the valves is evacuated into the combustion chamber (to be then evacuated during prepurge). The length of time the valve remains open may be adjustable but will normally be around five seconds.
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Valve proving Evacuation test time Following the evacuation, a test is performed for a set amount of time to ensure that the gas pressure switch remains in the normally closed state. This time period may be adjustable and is normally around 25 seconds.
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Valve proving Pressurization After the evacuation test is passed, the upstream gas valve opens for an adjustable period (normally around five seconds) to pressurize the space between the safety shutoff valves. NORMALLY CLOSED PRESSURE < SETPOINT OPEN CLOSED Proprietary and Confidential...
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Valve proving Pressurization test time Following the pressurization, a test is performed for a set amount of time to ensure that the gas pressure switch changes to the normally open state. This time period may be adjustable and is normally around 25 seconds. If the test fails, the flame safeguard will lockout. This lockout indicates that the downstream valve may be leaking since the space in between is losing pressure.
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Valve proving BurnerPRO The following is a demonstration of the BurnerPRO performing a valve proving test, with a lockout due to a valve proving switch failure (switch didn’t change state to off after last test, indicating possible stuck or faulty switch).
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Valve proving BurnerPRO The Smart LEDs indicate the lockout code. Proprietary and Confidential...
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Valve proving BurnerPRO The following is a demonstration of the BurnerPRO performing a valve proving test, with a failure during the pressurization test. Proprietary and Confidential...
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Valve proving BurnerPRO The Smart LEDs indicate the lockout code. Proprietary and Confidential...
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Demonstration Sequence with valve proving The following is a demonstration of the BurnerPRO performing a successful startup, including a valve proving test. Proprietary and Confidential...
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