Figure 11: Wiring Diagram, 24 Volt Standing Pilot and Intermittent Circulation

SEQUENCE OF OPERATION

NORMAL OPERATION

1.When the thermostat call for heat, the vent damper will open (see paragraphs 17A through 17D). The circulator is started through a relay and at the same time the gas valve is energized allowing main gas flow and ignition of 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).

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, and the vent damper will close at the same time, but the circulator will continue to operated. 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 interrupt- ing power to the gas valve. The main burners will be extinguished immediately, the circulator will continue to operate, 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, the circulator will continue to operate 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 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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Burnham SERIES 2 manual Sequence of Operation Normal Operation, Safety Shutdown
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SERIES 2 specifications

The Burnham SERIES 2 is a highly regarded addition to the lineup of residential and commercial heating systems, known for its efficiency, reliability, and innovative design. Designed with the user in mind, the SERIES 2 boasts a range of main features that cater to the needs of modern heating solutions.

One of the standout characteristics of the Burnham SERIES 2 is its advanced cast iron construction. This material is renowned for its durability and excellent heat retention capabilities, ensuring that the system provides consistent warmth over extended periods. The cast iron heat exchanger allows for efficient heat transfer and maximizes energy output while minimizing heat loss.

Efficiency is a key focus for the Burnham SERIES 2, and it is designed to operate at high annual fuel utilization efficiency (AFUE) ratings. With its efficiency-enhancing features, including advanced combustion technology, the system helps homeowners save on energy costs while reducing their environmental footprint. The SERIES 2’s design helps ensure that a greater percentage of the fuel consumed is converted into usable heat, making it a smart choice for energy-conscious users.

Another significant feature is the versatile configuration options available with the Burnham SERIES 2. It can be installed in various settings, including basements, utility rooms, or even garages, due to its compact design. The system is compatible with multiple fuel types, allowing users to select between natural gas and propane to suit their specific preferences and availability.

The Burnham SERIES 2 also prioritizes ease of maintenance. Its user-friendly design includes access panels that simplify servicing and routine inspections. Additionally, it incorporates a range of safety features, such as an automatic shut-off system and built-in controls, to ensure safe operation.

In terms of technology, the SERIES 2 utilizes an innovative control system that optimizes heating cycles based on user demands and external conditions. This intelligent control enhances comfort and prevents excessive cycling, thereby prolonging the lifespan of the unit.

Overall, the Burnham SERIES 2 is distinguished by its robust construction, energy-efficient operation, versatility in installation, ease of maintenance, and advanced technology. For homeowners and businesses seeking a reliable heating solution, it represents a compelling choice, delivering warmth and comfort while remaining mindful of energy consumption and environmental impact.
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