Manuals / Burnham / Household Appliance / Boiler

Burnham MST629 R7184 Terminals, LED and Reset Button, Cad Cell Resistance When Sensing Flame

Models: MST513 MST396 MST629 MST288

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WARNING

Before installation of the boiler is considered complete, the operation of all boiler controls must be checked, particularly the primary control and pressure limit control.

2.VERIFY PRIMARY CONTROL FEATURES using procedures outlined in Instructions furnished with control or instructions as follows:

a. Features and Controls

i.The R7184 is a microprocessor-based control. The indicator light provides diagnostic information for lockout, recycling and patented cad cell status. There is a manual reset button to exit the Lockout

Mode and enter the Idle Mode (see Figure 25).

Figure 25: R7184 Terminals, LED and Reset Button

ii.Pump Priming Cycle: To facilitate purging air from the oil lines and filters, the R7184 can be placed in a purge routine by pressing and releasing the reset button during the safety check, delayed valve-on, ignition or carry-over periods.

iii.Limited Recycle: This feature limits the number of recycle trials (for each call for heat) to a maximum of three trials. If the flame is lost three times and does not successfully satisfy a call for heat, the R7184 locks out.

iv.Limited Reset (Restricted Mode): In order to limit the accumulation of unburned oil in the combustion area, the control can only be reset three times. The reset count returns to zero each time a call for heat is successfully completed.

•To reset from Restricted Mode: Press and hold the reset button for 30 seconds. When the LED flashes twice, the device has reset.

v.T-T Jumper: Select models have pre- installed T-T jumper. Do not remove jumper. See Figure 25.

vi.Diagnostic LED: The indicator light on oil primary control provides lockout, recycle and cad cell indications as follows:

•Flashing at 1 Hz (½ second on, ½ second off): system is locked out or in Restricted

Mode.

•Flashing at ¼ Hz (2 seconds on, 2 seconds off): control is in Recycle Mode.

•On: cad cell is sensing flame.

•Off: cad cell is not sensing flame.

vii.Cad Cell Resistance Check: For proper operation it is important that the cad cell resistance is below 1600 ohms. During a normal call for heat, once the control has entered the Run Mode, press and release the reset button. Indicator light will flash 1 to 4 flashes. See Table 7 for equivalent cad cell resistance.

Table 7: Cad Cell Resistance When Sensing Flame

Flashes

Cad Cell Resistance in ohms

1Less than 400

2More than 400 and less than 800

3More than 800 and less than 1600

4More than 1600 and less than 5000 b. Check Oil Primary Control

CAUTION

Due to the potential hazard of line voltage, only a trained, experienced service technician should perform the following safety checks.

This control contains no field-serviceable parts. Do not attempt to take it apart. Replace entire control if operation is not as described.

i.Preliminary Steps

•Check wiring connections and power supply.

•Make sure power is on to the controls.

•Make sure limit control is closed.

•Check contacts between ignitor and the electrodes.

•Check the oil pump pressure.

•Check the piping to the oil tank.

•Check the oil nozzle, oil supply and oil filter.

ii.Check Safety Features

Safe Start:

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Burnham MST629, MST288, MST396, MST513 manual R7184 Terminals, LED and Reset Button, Cad Cell Resistance When Sensing Flame
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MST513, MST396, MST629, MST288 specifications

The Burnham MST series, comprising models MST396, MST629, MST513, and MST288, is renowned for its robust design and exceptional performance in the boiler industry. Each model is engineered to provide optimal efficiency and reliability for residential and commercial heating applications.

The Burnham MST396 is distinguished by its high thermal efficiency and advanced combustion technology. This model features a cast iron heat exchanger which ensures superior heat retention and distribution. The MST396 is equipped with a powerful burner that allows for variable firing rates, maximizing efficiency and extending the lifespan of the unit. Additionally, it includes a built-in electronic ignition system that enhances reliability while reducing the need for frequent maintenance.

Moving to the MST629, this model is designed for larger applications needing higher output. It boasts a significant BTU input and utilizes a multi-stage burner system. This ensures optimal combustion and adapts to varying demand, providing consistent heat without wasting energy. The MST629 also incorporates enhanced insulation and an advanced flue gas venting system to improve safety and minimize energy loss.

The MST513 caters to mid-sized applications with its adaptable performance and user-friendly features. This model is notable for its compact design, making it suitable for installations with limited space. It uses a two-stage burner for efficient energy use and offers a smart control system that monitors performance in real-time. This allows users to make informed decisions about their energy consumption and maintenance needs, ultimately leading to cost savings.

Lastly, the MST288 is the smaller model in the series, ideal for homes and small businesses. Despite its size, it does not compromise on efficiency. The MST288 features a straightforward design, ensuring ease of installation and maintenance. It utilizes a single-stage burner that provides consistent heat output, making it a reliable choice for low-demand applications. The unit is also equipped with adjustable settings, allowing users to tailor their heating needs effectively.

In summary, the Burnham MST series demonstrates a remarkable blend of innovation and practicality across its models. With features like advanced burner technology, efficient heat exchangers, and smart controls, the MST396, MST629, MST513, and MST288 cater to a wide range of heating needs while prioritizing energy efficiency and user comfort. These models stand out in the market, continually setting a standard for performance and reliability in heating solutions.