Burnham Series 2B manual

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Figure 13: Wiring Diagram, 24 Volt Standing Pilot with Continuous or Gravity Circulation

Sequence of Operation

Normal Operation

1.When the thermostat call for heat, the vent damper will open (see paragraphs 17A through 17D). The gas valve is energized allowing main gas to flow and operation of the main burners.

2.Where condensation of flue gas is encountered in boiler flues a reverse acting circulator control should be installed to stop the circulator before the boiler water temperature drops to that which flue gas condensation may occur.

3.After the thermostat is satisfied the main valve will close and main burner flames will be extinguished.

The vent damper will close (see paragraph 17E). If the boiler is so equipped, circulator will continue to run.

Safety Shutdown

1.High Limit Switch: In the event excessive boiler water temperature is developed the high limit switch will open interrupting power to the gas valve. The main burners will be extinguished immediately. Normal operation will be resumed when the boiler water temperature drops to a point where the high limit switch closes.

2.Blocked Vent Switch: In the event excessive blockage in the vent system is developed the blocked vent switch will open interrupting power to the gas valve. The main burners will be extinguished immediately and the vent damper will remain open until the thermostat is turned off. The source of blockage must be corrected by trained and skilled personnel from a qualified service agency before resetting switch.

3.Flame Rollout Switch: In the event excessive blockage in the boiler section flue passageways is developed the flame rollout switch will open interrupting power to the gas valve. The main burners will be extinguished immediately and the vent damper will remain open until the thermostat is turned off. If the flame rollout switch is activated do not attempt to place the boiler in operation. The source of the blockage must be corrected and the flame rollout switch replaced by trained and skilled personnel from a qualified service agency.

4.Pilot: The thermocouple proves pilot flame and in the absence of such within 45-90 seconds causes the combination gas valve, which is equipped with a

100% shut-off provision, to be de-energized, thus, preventing main gas or pilot gas flow.

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Contents Price $3.00 Series 2 model BTable of Contents Weight Clearances Do not drop boiler. Do not bump boiler jacket against floorMinimum Clearances Equivalent Length of Fittings Specific Gravity Correction Factors for Natural GasBoiler Piping Page Page Do not use one vent damper to control two heating appliances Page Wiring Diagrams and Heat Anticipator Settings Page Safety Shutdown Sequence of Operation Page Sequence of Operation Normal Operation Wiring Schematic, Zone Valves II. Operating Instructions Top View of VR Gas Valves Yellow LED Flame Codes Instructions to PUT the Boiler in OperationGreen LED Status Codes Lighting Instructions Check Pilot Burner Flame Check GAS Input Rate to BoilerCombustion Chamber BURN-OFF Check Ignition System Safety SHUT-OFF DeviceIII. Trouble Shooting IV. Service Pilot Burner Location Burner 40mm BurnerAvoid Breathing Fiber Particulates and Dust Section Assembly Gravity Circulation Only Repair PartsCanopy Group Section Assembly and Canopy GroupThis page Left Intentionally Blank Base Assembly USS Manifold and Main Burners Inch Main Burners Manifold and Main Burners 1 Inch Main Burners Only Manifold and Main Burners 40mm Main Burners MM Main Burners Only4B MM Main Burner, Electronic Ignition Only 4D MM Main Burner, Natural Gas, 5001-9000 Ft. USA Only MM Main Burners Only 4C MM Main Burner Manifold4D MM Main Burner, Natural Gas, 2001-5000 Ft. USA Only 4D MM Main Burner, LP Gas, 2001-5000 Ft. USA OnlyBurner Only 40mm Burner Only Pilot Burner, Honeywell Q327A1147 Pilot Burner, Honeywell Q348A1002 Jacket Assembly Jacket Assembly, CompletePage Jacket Vestibule Panel Water Trim Limit Control Transformer Continuous and Gravity Circulation Only Transformer/Relay Assembly Intermittent Circulation OnlyFlame Rollout Switch Blocked Vent SwitchDraft Hood Carton Vent DamperVent Reducer Service Record Service Record Service Record Lwco Location Wiring of Typical LwcoLimited Warranty
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