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(index of gas throttle pin at a position of 90°). In the event that
it were necessary to modify the position of the strap, follow the
instructions laid out in paragraph: “Strap position adjustment
for gas throttle activation”.
5) During the initial adjustment operations of the burner set the air
pressure switch and the air pressure control pressure switch in
second stage to the minimum value on the respective adjust
-
ment scale.
6) Adjusting the air flow rate for first ignition
:
position the gas flow regulation cam for the first flame at quite a
low open angle, around 20°-25° (see 0002936390). If it exists,
open the safety valve flow regulator completely.
7) Now switch on the control panel switch. The control equip
-
ment thus receives voltage and the programmer causes the
burner to switch on as described in the chapter “O
PERATION
DESCRIPTION”.”. On first switching on repeated “lock outs”
may occur due to:
a) The gas piping is not being freed of air correctly and so there
is not enough gas to provide a stable flame.
b) “lock out” with flame present may be caused by instability in
the ionisation area, due to an incorrect air/gas ratio. This can
be solved by changing the amount of air and/or gas supplied
so as to find the right ratio. The same problem may be caused
by incorrect air/gas distribution in the combustion head. This
can be remedied with the combustion head adjustment de
-
vice by closing or opening further the air passage between
combustion head and gas diffuser.
c) It may happen that the ionisation current is interfered
with by the discharge current of the ignition trans
-
former (the two currents have a common path on the
burner’s “mass”) so the burner gets locked out due to
insufficient ionisation This can be remedied by invert
-
ing the supply (230V side) of the ignition transformer.
This problem may also be caused by an insufficient “ground
connection” to the burner’s casing.
d) In the event that ignition is difficult it is advisable to check the
air/gas ratio in the ignition phase proceeding with the inverter
“VS” parameter adustments (see chapter FREQUENCY
CONVERTER)
8) Having completed the adjustments for the first ignition, store
the setting in the inverter by exiting the programming mode
(see chapter FREQUENCY CONVERTER). Switch off the
burner and reconnect the previously disconnected 4 pole con
-
nector. Ensure that the air flow regulation cam in the second
stage of the electric servomotor is positioned at 90°.
9) Adjustment of second stage power
.
Reconnect power to the burner closing the main switch. The
burner will switch on automatically and activate the second
stage. With the aid of appropriate instruments, attend to the
regulation of the air and gas flow according to the procedures
subsequently described:
-To regulate the gas flow operate the valve regulator: to this
end consult the instructions related to the single stage gas
valve model installed.
- To adjust the air flow rate, vary the rotation speed of the fan
motor in second stage then proceed with the adjustment of
the inverter V2 parameter (see paragraph: “FREQUENCY
CONVERTER”). Progressively adjust the motor rotation
speed and therefore the air flow by pressing the in
or – keys, checking with appropriate instruments that the
combustion is correct (C0
2
max= 10%, O
2
min=3%, CO
max=0,1%). Having finished the air and gas flow adjustment,
check the actual gas flow rate by reading the meter. Avoid
keeping the burner running if the capacity is greater than the
maximum permitted amount for the boiler, or there is a risk
it could be damaged
10)
Adjustment of first stage power
.
Having finished regulating the burner in the second stage, put
the burner into the first stage without varying the regulation of
the gas valve already undertaken in point 9. With the aid of
appropriate instruments, attend to the regulation of the air and
gas flow according to the procedures subsequently described:
- To adjust the air flow rate proceed with the setting of the servo
control air adjustment cam in first stage (see 0002936390),
until the desired gas flow rate is obtained, as the rotation of
the gas throttle is derived from the rotation of the air shutter
- To adjust the air flow rate, vary the rotation speed of the fan
motor in first stage then proceed with the adjustment of the
inverter V1 parameter (see chapter “FREQUENCY CON
-
VERTER”). Progressively adjust the motor rotation speed
and therefore the air flow by pressing the in or – keys,
checking with appropriate instruments that the combustion is
correct (C0
2
max= 10%, O
2
min=3%, CO max=0,1%). Having
finished the air and gas flow adjustment, check the actual
gas flow rate in first stage by reading the meter.
11) Adjusting the air flow rate for ignition.
Ignition of the burner takes place with the air shutter and gas
throttle adjusted for first stage operation. Once adjustment
of the first stage has been carried out the burner needs to
be switched off with verfication that the ignition is not noisy.
In the event of pulsations during ignition, it is possible to "adjust"
the air flow rate for ignition proceeding with the adjustment of
the inverter Vs parameter (see chapter “FREQUENCY CON
-
VERTER”). It is often advisable to set Vs at a slightly higher
value than V1.
12) Adjusting the air pressure switch.
Put the burner into first stage operation and increase the air
pressure switch setting until the burner goes into lock-out.
Adjust the setting of the pressure switch to a level slightly below
the actual air pressure detected in first stage operation. Release
the burner and check that it starts up correctly.
13) Adjusting the air control pressure switch in second stage.
Put the burner into second stage operation and increase the
air pressure switch setting (see chapter “A
IR PRESSURE
SWITCHES
”) until the burner goes into lock-out. Adjust the
setting of the pressure switch to a level slightly below the actual
air pressure detected. Release the burner and check that it
operates correctly in second stage.
Summary of Contents for TBG 85 P-V
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