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DETAIL OF GAS FEED REGULATOR THROTTLE
VALVE WITH DUNGS SERVOMOTOR
A Gas throttle valve position reference index
B Gas modulation servomotor
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STARTING UP AND REGULATION WITH METHANE
S
1) If not already done at the moment of connecting the burner to
H
the gas pipeline, it is indispensable to carry out a purge of
the air contained in the pipeline. As a precaution, special care
should be taken and doors and windows should be opened.
Open the pipe union on the pipeline situated near the burner
and then open a little the gas cut-off cock (or cocks). When the
characteristic odour of gas can be smelled, close the cut-off
cock. Wait until the gas present in room has dispersed, and
then reconnect the burner to the gas pipeline. Subsequently,
re-open the gas cut-off cock.
2) Check that there is water in the boiler and that the system's gate
valves are open.
3) Check, with absolute certainty that the discharge of combustion
products can take place freely (boiler and chimney lock-gates
should be open).
4) Make sure that the voltage of the electric line to which the burner
is to be connected,corresponds to that required by the burner
and that the electrical connections (motor and principle line)
have been prepared to match the voltage rating available. Also
check that all the electrical connections carried out on the spot
are in accordance with our electric wiring diagram.
5) Make sure that the combustion head is long enough to enter
the furnace to the extent specified by the boiler manufacturer.
Check that the device which regulates the air on the combu-
stion head is in the position considered necessary for the fuel
delivery required (air passage between the disk and the head
should be considerably reduced when the fuel delivery is re-
duced; on the other hand, when the fuel delivery is fairly high,
the air passage between the disk and the head should be re-
latively open). See Chapter "Air Regulation on the Combustion
Head".
6) Apply a manometer with an adequate scale (if the entity of pres-
sure forecast allows it is preferable to use a column of water
instrument, do not use a pointer instrument for moderate pres-
sure) to the pressure plug on the gas pressure switch.
7) With the switch (1) (see page 33) on the burner's control pa-
nel in the "o" position and the main switch inserted check, by
manually closing the relay, that the motor rotates in the right
direction. If it does not, exchange the places of two cables of
the motor's supply line in order to invert its sense of rotation.
8) Now insert the switch on the command panel. The control box
receives voltage in this way and the programmer turns on the
burner as described in Chapter "Description of Operations". To
adjust the burner see the "MPA 22" electronic cam instructions
in the attached manual code 0006080905.
9) After adjusting the "minimum", (P1) bring the burner towards
maximum via the controls on the MPA 22 keypad. (see MPA
22 electronic cam instructions in the attached manual code
0006080905).
10) We recommend that you carry the out combustion tests with
the appropriate instrument at all intermediate
points in the modulation range (from P1 to P9); also check the
gas flow delivery rate via the meter.
It is essential to check, with a suitable instrument, that the per-
centage of carbon monoxide (CO) present in the fumes does
not exceed the limit set by regulations at the time of installa-
tion."
11) Now check automatic mode working of the modulation (see
"MPA 22" electronic cam instructions in enclosed manual code
0006080905). In this mode the equipment receives the signal
from the electronic modulation adjuster RWF 40, if the burner
is modulating version, or from the thermostat or the pressure
switch second stage if the burner is progressive two stage.
12) The air pressure switch has the job of bringing the control box
to a safety shut down if the air pressure is not at the correct
value. Therefore, the air pressure switch must be regulated in
such a way as to intervene by closing the contact (foreseen to
by closed while working) when the air pressure in the burner
has reached a sufficient level. The pressure switch is self-con-
trolled and therefore it must close the contact (fan stops and
consequently there is an absence of air pressure in the bur-
ner) if it does not, the control box will be inserted (the burner
remains at a stadstill).It must be specified that if the contact is
not closed during working (insufficient air pressure), the con-
trol box will carry out its cycle, but the ignition transformer will
not be inserted and the gas pilot valves will not open. Con-
sequently, the burner will go to "shut down". Check that the
air pressure switch functions properly with burner at minimum
delivery, increase the regulating value until it reaches interven-
tion point and the burner should go to shut down. To unblock
the burner, press the special push-button and return the pres-
sure switch regulator to a sufficient value in order to measure
the air pressure existing during the pre-ventilation phase.
13) The pressure switches which control the gas pressure (mini-
mum and maximum) have the job of stopping the burner fun-
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0006081328_200808
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