Burnham MST288, MST396, MST629, MST513 manual Boiler Sequence of Operation with Probe Lwco See Figure

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BOILER SEQUENCE OF OPERATION WITH PROBE LWCO (See Figure 18)

When the thermostat calls for heat, it energizes the R8285C Control Center relay which in turn energizes the cad cell primary control, bringing on the burner. The burner will operate in the following sequence: Prepurge for the first 10 seconds; fire until the thermostat is satisfied or the limit setting on the high limit is reached; post-purge for the last 10 seconds. When the pressure limit control restores the circuit on a drop in pressure, the burner will start if the thermo- stat is still calling for heat.

The probe low water cut-off will shut down the burner after a 10-15 second delay, if the water level in the boiler drops below the probe level.

The Hydrolevel CG450 low water cut-off will shut down the burner for 90 seconds every 10 minutes of firing time to allow water level to stabilize. If the water level is too low the burner will not be allowed to restart.

The probe low water cut-off will reset and restart the burner with a call for heat a few seconds after the water is re- turned to its normal level.

On burner start, if the cad cell does not see flame within approximately 15 seconds, primary control will shut burner down and enter into a recycle mode, after 60 seconds burner will restart and repeat trial for ignition. If after three

(3)trials for ignition, flame is not detected, control will enter into restricted mode and must be reset manually before burner can be restarted.

When there is no demand for heat, the operating control will maintain the boiler water temperature at the selected setting for proper operation of the domestic water heater, if equipped with optional tankless heater.

BOILER SEQUENCE OF OPERATION WITH PROBE LWCO (See Figure 19)

When the thermostat calls for heat, it energizes the R8285C Control center relay, which in turn energizes the cad cell primary control, bringing on the burner. The burner will operate in the following sequence: Prepurge for the first 10 seconds; fire until the thermostat is satisfied or the limit setting on the high limit is reached; post-purge for the last 10 seconds. When the pressure limit control restores the circuit on a drop in pressure, the burner will start if the thermostat is still calling for heat.

The probe low water cut-off will shut down the burner after a 10-15 second delay, if the water level in the boiler drops below the probe level.

The probe low water cut-off will reset and restart the burner with a call for heat a few seconds after the water is returned to its normal level.

On burner start, if the cad cell does not see flame within approximately 15 sec- onds, primary control will shut burner down and enter into a recycle mode, after 60 seconds burner will restart and repeat trial ignition. If after three (3) trials for igni- tion, flame is not detected, control will enter into restricted mode and must be reset manually before burner can be restarted.

When there is no demand for heat, the operating control will maintain the boiler water temperature at the selected setting for proper operation of the domestic water heater, if equipped with optional tankless heater.

McDonnell & Miller PS-801 Terminals May be Lettered or Numbered as Follows:

Wire

Numbered

Lettered

Color

Terminals

Terminals

RD

5

B

BK

1

H

WH

2

N

Jumper

1-3

H-C

BOILER SEQUENCE OF OPERATION WITH FLOAT LWCO (See Figure 20)

When the thermostat calls for heat, it energizes the R8285C Control center relay, which in turn energizes the cad cell primary control, bringing on the burner. The burner will operate in the following sequence: Prepurge for the first 10 seconds; fire until the thermostat is satisfied or the limit setting on the high limit is reached; post-purge for the last 10 seconds. When the pressure limit control restores the circuit on a drop in pressure, the burner will start if the thermo- stat is still calling for heat. The low water cut-off will shut down the burner if the water level in the boiler drops too low. The control resets and restarts the burner with a call for heat a few seconds after the water is returned to its normal level.

On burner start, if the cad cell does not see flame within approximately 15 seconds, primary control will shut burner down and enter into a recycle mode, after 60 seconds burner will restart and repeat trial for ignition. If after three

(3)trials for ignition, flame is not detected, control will enter into restricted mode and must be reset manually before burner can be restarted.

When there is no demand for heat, the operating control will maintain the boiler water temperature at the selected set- ting for proper operation of the domestic water heater, if equipped with optional tankless heater.

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Contents MegaSteam 100618-01R4-5/08 Price $3.00Important Information Read Carefully Page Table of Contents Page =B=R NET Section I PRE-INSTALLATION Boiler is Suitable for InstallationPage Control Carton Insulation WrapperJacket Carton Instruction/Label BagProcedure To Open, Close and Secure Burner Swing Door Jacket Front Panel InstallationBoiler Removal from Skid Page Page Flueway Baffle Installation Baffle UsageClosing / Securing Burner Swing Door Jacket Rear Panel Installation Flue Cleanout Covers and Smokebox Collar InstallationUNC Less HeaterSide and Top Jacket Panel Installation External Electrical Enclosure MountingTrim and Controls Installation. Pressure Limit Installation Pressure Gauge and Gauge Glass InstallationFloat-Type Lwco and Pressure Limit Installation Safety Valve and Drain Valve Installation Oil Burner InstallationDo not install burner without gasket Aquastat bulb must be fully inserted into the wellOil Burner Installation Section III Steam Boiler Piping & Trim Evaluate the existing steam systemRecommended Boiler Piping for Gravity Return Steam Boiler Section IV Tankless & Indirect Water Heater Piping Schematic Tankless Water Heater Piping Tankless Heater Data Alliance Water Heater Piping with MegaSteam Boiler Chimney Connector Section V Venting & Air intake pipingChimney Venting Recommended Vent Pipe Arrangement and Chimney Requirements Stack Temperature DraftMinimum Clearances Do not exceed maximum allowable air intake lengthSeal all external joints with weatherproof caulk Section VI Electrical GeneralWiring Diagram, Steam, Hydrolevel CG450 Probe Lwco Wiring Diagram, Steam, McDonnell & Miller PS-801 Probe Lwco Wiring Diagram, Steam, McDonnell & Miller #67 Float Lwco Boiler Sequence of Operation with Probe Lwco See Figure Boiler Sequence of Operation with Float Lwco See FigureSingle Pipe Oil Lines Single Pipe Oil LineTwo Pipe Oil Lines Two-Stage Units 3450 RPM Two Pipe SystemsSingle-Stage Units 3450 RPM Two Pipe Systems Always Inspect Installation Before Starting Burner Section Viii System START-UPAdjusting Fuel Pump Pressure Adjust OIL Burner While OPERATING. flame presentPage R7184 Terminals, LED and Reset Button Cad Cell Resistance When Sensing FlameCad Cell Location Jumper must be removed after this checkAvoid Breathing Fiber Particulates and Dust Section Ix Maintenance and Service Instructions Steam BoilersPage Gallons / Month MST288 MST396 MST513 MST629 Section X Boiler Cleaning Clean the Flueways See FigureClean the Combustion Chamber Page Section XI Trouble Shooting Section XII Repair Parts Bare Boiler Assembly Bare Boiler Assembly Bare Boiler Assembly 1FF Jacket Assembly Jacket Assembly MST288 Thru MST629 Steam Boilers Trim and Controls MST Trim and Controls Beckett AFG Burner Beckett OIL Burner Part NOS. for MegaSteam Series Boilers Beckett AFG Burner specifications OUTService Record Limited Warranty

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.
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