Publicité
Les langues disponibles
Les langues disponibles
DETAIL OF GAS FEED REGULATOR THROTTLE VALVE
E
WITH DUNGS SERVOMOTOR
N
A Gas throttle valve position reference index
G
B Gas modulation servomotor
L
I
S
H
A
B
STARTING UP AND REGULATION WITH METHANE
1) If not already done at the moment of connecting the burner
to the gas pipeline, it is indispensable to carry out a purge
of the air contained in the pipeline. As a precaution, spe-
cial 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 sy-
stem's gate valves are open.
3) Check, with absolute certainty that the discharge of com-
bustion 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 ra-
ting 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 ma-
nufacturer. Check that the device which regulates the air
on the combustion head is in the position considered ne-
cessary for the fuel delivery required (air passage betwe-
en the disk and the head should be considerably reduced
when the fuel delivery is reduced; on the other hand, when
the fuel delivery is fairly high, the air passage between the
disk and the head should be relatively open). See Chapter
"Air Regulation on the Combustion Head".
6) Apply a manometer with an adequate scale (if the entity of
pressure forecast allows it is preferable to use a column
of water instrument, do not use a pointer instrument for
moderate pressure) to the pressure plug on the gas pres-
sure switch.
7) With the switch (1) (see page 33) on the burner's con-
trol panel 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 con-
trol 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 to-
wards 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
percentage
fumes does not exceed the limit set by regulations at the
time of installation."
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 bur-
ner is progressive two stage.
12) The air pressure switch has the job of bringing the con-
trol 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-controlled and therefore it must
close the contact (fan stops and consequently there is an
absence of air pressure in the burner) if it does not, the
control box will be inserted (the burner remains at a stad-
still).It must be specified that if the contact is not closed
during working (insufficient air pressure), the control box
will carry out its cycle, but the ignition transformer will not
be inserted and the gas pilot valves will not open. Conse-
quently, the burner will go to "shut down". Check that the
air pressure switch functions properly with burner at mini-
mum delivery, increase the regulating value until it reaches
intervention point and the burner should go to shut down.
To unblock the burner, press the special push-button and
return the pressure 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
(minimum and maximum) have the job of stopping the bur-
ner functioning when the gas pressure is not within the va-
lues specified. From the specific functions of the pressure
switches, it is evident that the pressure switch controls the
10 / 15
0006081083_200705
of carbon monoxide (CO) present in the
Publicité
