Assessments - 4, GPA: 3.8
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5. When the call for heat is satisfied, the damper relay coil is de-energized - closing contacts which energize the damper motor. This causes the damper to close. When the damper blade reaches the fully closed position, the damper motor is de-energized. POWER FAILURE - The damper blade will stop in the position it was in when power failed. (Combustion can never take place unless the damper blade is in the fully open position). G. Sequence of Operation and Wiring. Refer to Table 10 for the appropriate control system. H. Optional Low-Water Cut-Off Wiring. See Figures 45 through 48. Control System Heat Anticipator Setting * Continuous Circulation Intermittent Circulation 24V Standing Pilot 1.1 0.3 24V Electronic Ignition USA: 0.9 0.3Canada: 1.2 * If room is heated above thermostat temperature setting, reduce heat anticipator setting by 0.1 or 0.2 amps. If boiler short cycles without room reaching desired temperature, increase heat anticipator by 0.1 or 0.2 amps. Table 10: Sequence of Operation and Wiring Diagrams Ignition System Country Fuel Boiler Sizes Wiring Diagram Figure Sequence of OperationContinuous Intermittent Standing Pilot (24V) USA & Canada Natural Gas 6 & 7 Sect. Figure 29 Figure 30 Page 36LP Gas Standing Pilot (OP - 120V) USA & Canada Natural Gas 6 - 10 Sect. Figure 31 Figure 32 Page 39LP Gas Standing Pilot (OP-CSD-1 - 120V USA LP Gas 8 - 10 Sec. Figure 31 Figure 32 Page 39 Intermittent Ignition (Honeywell EI - 24V) USA Natural Gas 5 - 10 Sect. Figure 33 Figure 34 Page 42 LP Gas Canada Natural Gas 5 - 10 Sect. Figure 35 Figure 36LP Gas 5 - 7 Sect. Intermittent Ignition (EP - 120V) USA & Canada Natural Gas 6 - 10 Sect. Figure 37 Figure 38 Page 47 LP Gas Not Available Intermittent Ignition (EP-CSD-1 - 120V) USA Natural Gas 8 - 10 Sect. Figure 37 Figure 38 Page 47 1. Standing Pilot (24) Sequence of Operation a. Normal Operation i. Thermostat or operating control calls for heat. Vent Damper (if used) opens. ii. Gas valves are energized allowing main gas flow and ignition of main burners. iii. Call or heat ends. Gas valves are de- energized, extinguishing main flame. Vent Damper (if used) closes. b. Safety Shutdown i. Limit: Automatically interrupts main burner operation when water temperature exceeds set point. Maximum allowable temperature is 250°F. Circulator continues to operate with call for heat, Vent Damper (if used) closes. Normal operation resumes when water temperature falls below set point. ii. Blocked Vent Switch: Automatically interrupts main burner operation when excessive flue gas spillage occurs. Circulator continues to operate and Vent Damper (if used) remains open with call for heat. If blocked vent switch is activated do not attempt to place boiler in operation. Correct cause of spillage and reset blocked vent switch. iii. Flame Roll-out Switch: Automatically interrupts main burner operation when flames or excessive heat are present in vestibule. Circulator continues to operate and Vent Damper (if used) remains open with call for heat. Control is single use device. If flame roll-out switch is activated, do not attempt to place boiler in operation. Correct cause of spillage and replace flame roll-out switch. iv. Thermocouple: Senses pilot flame and causes gas valves to turn off main burner and pilot burner gas flow should pilot burner flame extinguish. Circulator continues to operate and Vent Damper (if used) remains open with call for heat. Figure 2 : Wiring Diagram, Standing Pilot (24V), USA and Canada, Continuous Circulation 3 Figure 30: Wiring Diagram, Standing Pilot (24V), USA and Canada, Intermittent Circulation 2. Electronically Supervised Standing Pilot (OP) Sequence of Operation a. Normal Operation i. Thermostat or operating control calls for heat. ii. Terminal #6 of RM7890C Burner Control is energized, initiating a microcomputer monitored circuit test. iii. Pilot Flame Establishing Period (PFEP) begins. iv. After pilot flame is proven, terminal #9 of RM7890C is energized, allowing main gas flow and ignition of main burners. “Main” gas light will be illuminated. v. Call for heat ends. Terminal #6 of RM7890C is de-energized, in turn de- energizing gas valves and extinguishing main flame. “Main” gas light is de- energized. b. Safety Shutdown i. Limit: Automatically interrupts main burner operation when water temperature exceeds set point. Maximum allowable temperature is 250°F. Circulator continues to operate with call for heat. Normal operation resumes when water temperature falls below set point. ii. Blocked Vent Switch: Automatically interrupts main burner operation when excessive flue gas spillage occurs. Circulator continues to operate with call for heat. If blocked vent switch is activated do not attempt to place boiler in operation. Correct cause of spillage and reset blocked vent switch. iii. Flame Roll-out Switch: Automatically interrupts main burner operation when flames or excessive heat are present in vestibule. Circulator continues to operate with call for heat. ...
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