Brahma 37201367 MPI23 control box

Brahma MPI23 37201367 controller belongs to a series of devices based on microcontrollers and is designed to control forced-draft burners using mixed oil and gas fuels with intermittent operation. The Brahma MPI23 37201367 relay is a new product that, in addition to performing all the standard functions of the burner, also includes a valve inspection system test program, activated on request.

Connecting only one control unit instead of two is a technical and economic advantage. These control elements provide a non-volatile lock that allows the system to be restarted only through a manual reset of the control. One of the features is the ability to control various types of air dampers, ensuring the versatility of the control unit and compliance with the operating cycle prescribed by the standards.

The Brahma MPI23 37201367 controller is suitable for use with multi-stage or modulating burners for domestic and industrial heating.

General characteristics

• Flame control using flame straightening (ionization) properties or UV1 type ultraviolet phototubes (technical specifications are specified in the relevant technical data sheets).

• Two independent safety contacts for controlling the gas valve.

• The service life of electrical equipment is more than 250,000 operations at the maximum declared load.

• Built-in and/or remote manual reset with liquid crystal indication of the reasons leading to an emergency shutdown.

• The ability to control the valve inspection system at the pre-purge stage or after purging.

• Easy to install and connect.

• The possibility of multiple ignition attempts depending on the end use.

• Operating cycles compatible with the LFL1 type controller (Siemens). When replacing the control unit, the outlet must also be replaced.

Technical specifications

Power supply: 230 V (+10%/-15%) – 50/ 60 Hz; on request: 110/120 V (+10%/-15%) – 50/ 60 Hz

Operating temperature range: -20°C + 60°C

Ambient humidity: no more than 95%

Degree of protection: IP40

Classification codes:

according to EN 298:03 FBLLXN

according to EN 230:05 FTLLXN ”WLE”

Power consumption at startup: 7.5 VA

Power consumption during operation: 9 VA

The presence of a base: no

Pre-ventilation time (TV/TP): 67.5 sec

Safety time (ts): 2.5 sec

Tightness control of gas valves: yes

Weight: 0.95 kg

Dimensions: 10.3×10.3×9.1 cm

Operating mode

When the thermostats R, W and GP are closed, the device sends a command to start the engine of the first burner (M1) and, after the delay time (t7), also to the engine of the second burner (M2). After the delay t16 expires, the air flap is commanded to open up to max. air flow; as soon as the air flap is fully open, the control system checks the APS air pressure switch, and if the APS does not switch within time t10, the control system will perform a lockout. Otherwise, the cycle will continue taking into account the pre-purge time (t1). At the end of the pre-purge stage, the air flap is commanded to close to a minimum. the air flow, and the pre-ignition phase t3 (t3’) begins, at which the ignition transformer is activated. If at this stage the control unit detects a flame signal in the burner (for example, due to leakage from the fuel valves), it will perform a lockout within 1 second. If the pre-ignition stage is successfully completed, the safe time t2 (t2’) will begin, during which the control unit supplies power to the gas valve and maintains the operation of the ignition transformer. At the end of the process, during a safe time, the control system checks the flame signal; if no flame signal is detected, the control unit switches to lock mode. The second valve is switched on with a delay of t4 compared to the first valve, provided that a sufficient flame signal is detected. The start sequence ends after the delay t5 expires, when the air flap begins to adjust between the minimum and maximum air flow through the external LR control. At start-up, the air flap is checked to ensure that it is in the closed position (z); As soon as power is supplied to the M1 engine, the control system ensures that the air flap is in the fully open position (a) to ensure the best cleaning of the combustion chamber; before the start of the pre-ignition time, the control system gives the closing command to min. air flow (m); this state is maintained until the end of the ignition sequence, then the control unit sends a modulation command to the external LR device.