E4.225 GF-T

Commissioning

Program sequence test

Adjusting burner output

Testing the burner program sequence before initial gas release

• Close the manual shut-off valve upstream of the compact gas unit.

• Bridge the gas pressure switch

(terminal 2 and 3) if necessary if there is insufficient gas pressure upstream of the compact gas train. Disconnect the burner from the power supply first.

• Start the burner by switching on the heat generator and test the program sequence.

• The blower starts after a delay, depending on the automatic combustion control unit setting.

• Pre-ventilation period (54 s)

• Pre-ignition period (3 s)

• Solenoid valves open

• Safety time (3 s)

• Safety shutdown at the end of the safety time with locking of automatic combustion control unit (malfunction lamp lit).

• Disconnect the burner from the power supply by disconnecting the electrical connection and remove the wire jumper for the gas pressure switch if necessary.

• Reconnect the electrical connection.

• Unlock the automatic combustion control unit.

• Start the burner.

Rapid stroke

Initial gas flow adjustment

Main flow adjustment

Pressure switch

Coil

Access to filter

Connecting flange

Initial load flow adjustment - rapid stroke adjustment

• Twist off protective cap B and turn it through 180° to use it as an adjustment tool.

• Turn the adjustment spindle to the minimum position, then turn it back towards the plus symbol to the middle position (approximately 3 half turns).

The initial gas flow is now set to around half open.

• To achieve smooth starting characteristics, the initial gas flow should be adapted to the pressure characteristics of the heat generator.

Full load flow adjustment

• Loosen the locking screw until rotary knob C becomes adjustable. Do not loosen the sealed screw on the opposite side.

• Reduce the main flow by turning knob

C clockwise or reduce it by turning it anti-clockwise. The total path to adjust from minimum to maximum flow is approximately 4.5 turns.

• Retighten the locking screw following the adjustment.

pBr (4-20 mbar)

Adjusting screw of the gas pressure regulator

Pressure regulator adjustment

The adjusting screw has a path of 60 turns for adjusting the output pressure.

Three turns clockwise or anti-clockwise increases or reduces pressure by

1 mbar respectively.

At commissioning:

• fine tune the adjustment (more or less pressure)

• Check the gas pressure either at the multiblock pBr (M4) or the gas collector measurement nipple Ø9.

Optimising combustion values

Optimum combustion values can be achieved by adjusting the position of the baffle plate (dimension Y) if necessary.

Doing this can have an effect on starting characteristics, pulsation and combustion values. Any reduction in scale value Y increases the CO

2

value.

However, starting characteristics become harsher. Compensate for the change in airflow if necessary by adjusting the air flap position.

N.B.: Observe the minimum required flue gas temperature specified by the boiler manufacturer and the requirements demanded of flue gas ducts for avoiding condensation.

Locking screw

Sealed screw

40 02/2007 - Art. Nr. 13 021 281A