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• All covers or service access plates must be in place at all times except during maintenance and service. • This applies to all controls, panels, enclosures, switches, and guards or any component with a cover as part of its design. Incorrect Wiring Will Result in Improper Control Operation Fire or Explosion Hazard Can cause severe injury, death, or property damage. • The control can malfunction if it gets wet, leading to accumulation of explosive vapors. • Never install where water can flood, drip or condense on the control. • Never use a control that has been wet - replace it. Sequence of Operation RM7897C & RM7840L Flame Safeguard Controls 1. 2. 3. 4. 5. 6. 7. Initiate – The primary control enters the INITIATE sequence when the control is first powered on or power returns after an interruption. The initiate sequence is a ten second delay during which the control verifies line voltage stability. Standby – The control enters STANDBY until the limits, operating limit control, burner switch, and all microcomputer-monitored circuits are in the correct state. Load Demand – Operating limit control contacts close on drop in temperature (or pressure) and initiates the start sequence. Prepurge – The control will signal the PREPURGE sequence when the airflow interlock and all switches are in the correct state. The Prepurge sequence is the amount of time the blower motor runs prior to the ignition start sequence. Timing for the Prepurge sequence is determined by a card mounted inside the control module (typically 30 seconds). For the RM7897A control, Prepurge is conducted with the air damper in the low fire position. For the RM7840 control the air damper opens to the high fi re position for the timed prepurge period and returns to the low fire position before releasing the control for ignition. Trial for Ignition (TFI) –After the Prepurge sequence has timed out, the ignition and main gas valves will be energized. Because the burner has direct spark ignition for the main fl ame, the fl ame must be established and detected by the control within 4 seconds or lockout will occur. Flame Stabilization – The burner will operate in low fire for 10 seconds before initiating high fire. Run – With a flame established and the control continuing to detect a flame, the burner will operate 14 CG15, CG25, CG50 Burner Manual 15 Figure 9A - Typical Wiring Using Model RM7897C for High/Low Control (For Reference Only) in the RUN mode until the load demand is satisfi ed or a limit opens. For High/Low control wiring (Figure 9A), if terminals RC1 and RC2 are jumpered, the burner operates in the Low-High-Off mode. The burner starts at Low and goes to High after the fl ame stabilization period. Flame is extinguished when the load is satisfi ed or a limit opens, and the burner is sent to post purge. For High/Low control wiring (Figure 9A), if a high / low control has been wired between terminals RC1 and RC2 the burner starts at Low and is released to go to High after the fl ame stabilization period. It can repeatedly cycle between low and high as necessary to meet load demand until the load is satisfi ed or a limit opens, and the burner is sent to post purge. For modulating control wiring (Figure 9B), the 0 0 0 burner starts at Low and is released to modulate after the fl ame stabilization period. It can modulate between low and high as necessary to meet load demand until the load is satisfi ed or a limit opens, and the burner is sent to post purge. Load Satisfi ed – The fuel valves are closed. After a 15 second post purge, the burner switches to idle until the next call for operation. 8. This operation sequence is typical and for reference only. The primary control could vary, depending on the customer specifi cation and code requirements. For the specifi c operating sequence that applies to your installation, consult the appliance manufacturer’s directions, wiring instructions, and control manufacturer’s literature supplied with your burner. Section: Sequence of Operation 16 Figure 9B - Typical Wiring Using Model RM7840L for Modulating Control (For Reference Only) Section: Sequence of Operation Section: Prepare the Burner for Start-up Prepare the Burner for 2. Gas Supply Piping Start-up Professional Installation and Service Required Incorrect installation and mishandling of startup could lead to equipment malfunction andresult in asphyxiation, explosion or fire. • This burner must be installed and prepared for startup by a qualified service technician who is trained and experienced in commercial gas burner system installation and operation. • Carefully follow the wiring diagrams, control instruction sheets, flame safeguard sequence of operation, test procedures and all appliance manufacturer’s directions that pertain to this installation. • If any of these items are not clear or are unavailable, call Beckett at 1-800-645-2876 for assistance. Delayed Ignition, Explosion and Fire Hazards This is a direct spark ignition burner andby code requi...
Questo manuale è adatto anche per i modelli :Greeley - CG15 (2.99 mb)
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