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STRAP POSITION ADJUSTMENT FOR GAS
THROTTLE ACTIVATION
The adjustment of the TBG 85 P-V burner fuel capacity is carried
out using the rotation of a butterfly valve whose movement is due
to the rotation of the air shutter using the strap (3) in the figure.
According to the position in which the joints at the end of the strap
are fixed (holes 1,2,3,4 of lever A fixed to the air shutter pin or holes
1,2,3 of lever G fixed to the gas throttle pin) different rotation ratios
for the two shutters is acheived.
The factory setting for the TBG 85 PV model envisage the following
combinations:
Gas throttle lever G: hole N.1
Air valve lever A: hole N.3
With this combination, in relation to the maximum opening position
of the air shutter (90°), the maximum opening of the gas throttle is
achieved (90°).
The factory setting guarantees optimal burner operation in the ma
-
jority of applications, although in some cases it is better to modify
the position of the joints on one or both of the levers (see table).
The modify the position of the strap proceed as follows:
- Unscrew the two holding nuts of the pins on the two levers.
- Remove the strap and reposition it inserting the joint pins into
chosen holes.
- Fix down the strap again tightening the nuts and relative washers.
!
In the event the position of the straps is modified with respect
the factory configuration, it is advisable to set the air flow
regulation cam to 2
a
flame in the position corresponding to
the maximum opening of the gas throttle.
Advised strap position relating to the second stage burner thermal
output
Second stage
thermal output [kW
]
Air lever hole
A
Gas lever
hole
G
TBG 85 P-V
850 - 600*
3
1
600 - 400
4
1
** The best configuration can vary according to the charactersitics
of the application
AIR PRESSURE SWITCHES
The TBG 85 PV serie burner is equipped with two air pressure
switches which take the pressure signal in the same point inside the
fan. The pressure switch (1) (see diagram) carries out the function
of safety device envisaged by standard EN 676.
The pressure switch for second stage air pressure control (2) allows
surveillance of the proper operation of the burner in the second
stage of power. For example, if due to a faulty inverter, when passing
from first to second stage, the motor does not reach V2 speed (see
chapter: “FREQUENCY CONVERTER”, necessary to guarantee the
supply of the correct combustion air flow rate, the pressure switch
for second stage air pressure control detects pressure lower than
that set and locks out the burner.
When the burner does not operate in second stage, the signal from
the pressure switch (2) is ignored and the burner control is assigned
to the pressure switch (1) as envisaged by the standard.
Air pressure switch adjustment scale (1):
0.3 ÷ 3.5 mbar
Second stage air control pressure switch
adjustment scale (2):
2 ÷ 24 mbar
drilling lever
gas throttle “G”
drilling lever
air valve “A”
Summary of Contents for TBG 85 P-V
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