Gas Train Assembly; Low Gas Pressure Switch Adjustment - Baxi ROCA CRONO 8-G2 Instrucciones De Instalación, Uso Y Mantenimiento

TYPE
MULTIBLOC
MBZRDLE 405 B01
MBZRDLE 407 B01
MBZRDLE 410 B01
MBZRDLE 412 B01
MBZRDLE 415 B01

GAS TRAIN ASSEMBLY

The gas trains must be installed on the left side of the burner: in case of assembly on the right side, it is
necessary to remove the pressure test point on the other side (2).
It can be necessary to insert an adapter between the gas train and the burner, if the gas train diameters are
different from the burner diameter.
The connection between the gas supply line and the gas train is made by using the flange (1), supplied with
the gas train and by fixing it to the assembly with nuts (3).
It is best to tighten screws in a crisscross pattern.
Do not, under any circumstances, install the valve with the coil facing down. Once installation is complete,
you must check for leaks and make sure the gas train is working properly.
PRESSURE STABILIZER ADJUSTMENT (4)
Set the pressure regulator by turning the screw with a suitable screwdriver: turning clockwise increases
pressure delivery, whilst turning anticlockwise decreases pressure. At the first starting of the burner, it is
necessary to rotate this screw at least 10 turns in the direction (+).
At this point, it is possible to set the pressure stabilizer
Once you reach the desired nominal pressure value, close the cap and seal the ends of the wire with lead,
leaving the loop passing through the holes short.
VALVE ADJUSTMENTS
The ignition output (opening phase of the valve) is adjusted, after unscrewing of the small cover (5), by
rotating the below shaft in the direction + / –; it is possible to use, by overturning, the same small cover as
tool.
st
1 STAGE OUTPUT: Partial output
st
The partial output 1 stage can be adjusted until 40% of the nominal output. The adjustment is possible by
rotating the nut (9) in the right direction + / –.
nd
2 STAGE OUTPUT: Main output
The output is reached progressively, starting from the ignition stage which is limited by the operation of the
hydraulic brake; the output can be adjusted by rotating the rug nut (6) + / –, after loosening the unsealed
screw (7), however it is better to set the output by adjusting the pressure stabiliser (4) or by a compromise
between the pressure stabiliser and the valve adjustment.

LOW GAS PRESSURE SWITCH ADJUSTMENT

Adjust the gas pressure switch (8) by adjusting the graduated scale's wheel, after carrying out all the other
adjustments of the burner with the gas pressure switch adjusted at the beginning of the scale.
Let the burner work at the required output.
Close slowly the gate valve until the pressure, measured on the gas pressure switch gauge, comes down of
5 - 6 mbar with regard to the working value.
Rotate slowly the gas pressure switch handle until the operation of the same gas pressure switch and the
resultant burner shut-down. Open completely the gate valve.
2480
CONNECTIONS
GAS TRAIN
Ø D
CODE
NETWORK
143040192 Rp
3 / 4
143040150 Rp
3 / 4
143040153 Rp 1"
143040171 Rp 1"
1 / 4
143040172 Rp 1"
1 / 2
DIMENSIONS
Ø E
A
BURNER
Flange 257
Flange 270
Flange
351
Flange
Flange 350
2 GB
WIRING
CONNECTIONS
B
236 6 pin plug
236 6 pin plug
6 pin plug
259
6 pin plug
330 6 pin plug