SEQUENCE OF OPERATION

NORMAL OPERATION

1.When the THERMOSTAT calls for heat, the RELAY is energized. The CIRCULATOR starts and the VENT DAMPER is opened (see Paragraphs 17A through 17D). When the damper blade reaches the fully open position, the GAS VALVE powers the igniter circuit and opens the pilot valve.

2.The sensing circuit between the Q3450 or Q3480 pilot and the GAS VALVE proves presence of pilot flame.*

3.The GAS VALVE de-energizes the igniter and opens the main valve, allowing main gas to flow and ignition of main burners.

4.Where condensation of flue gas is encountered in boiler flues, a REVERSE ACTING CIRCULATOR CONTROL should be installed to stop the CIRCULA- TOR before the boiler water temperature drops to that at which flue gas condensation may occur.

5.The burners and CIRCULATOR will operate simulta- neously until the THERMOSTAT is satisfied.

6.After the THERMOSTAT is satisfied the main valve, pilot valve and the circulator will be de-energized and main burner and pilot 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, interrupt- ing power to the VENT DAMPER and the GAS VALVE. Main Burners and Pilot Burner 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 interrupt- ing power to the VENT DAMPER and GAS VALVE. Main burners and pilot burner will be extinguished immediately, the VENT DAMPER will close and the CIRCULATOR will continue to operate. 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 VENT DAMPER and the GAS VALVE. Main burners and pilot burner will be extinguished immediately. The VENT DAMPER will close and the CIRCULATOR will continue to operate. If the flame rollout switch is activated do not attempt to place the boiler in opera- tion. 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

A.Any pilot failure on the Q3450 or Q3480 Pilot will close the main gas valve and energize the igniter.

B.If the igniter breaks or becomes disconnected, the pilot valve coil loses power, closing the pilot valve.

5.For TROUBLE SHOOTING GUIDE, see Figure 28.

* · SV9500 and SV9600 Gas Valves:

The igniter and pilot gas valve will stay energized until either the pilot lights or the call for heat ends.

·SV9501 and SV9601 Gas Valves:

If the pilot fails to light after a 90 second trial for ignition, the igniter will be de-energized and the pilot gas valve will close. After a 5 minute delay, the igniter will be re-energized and the pilot gas valve will re-open. This continuous retry cycle will end either when the pilot lights or the call for heat ends.

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Image 15
Burnham SERIES 2 manual Vent Damper will close see Paragraph 17E
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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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