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Dosaodor-D
The moving assembly of the three‑way
solenoid valve is slightly different from the
two‑way valve, In fact it has an additional pad
on the upper part.
•
Replace the filtering cartridge located inside the filtering
assembly (key 25)
•
Restart the system.
Maintenance Repairs
To be carried out in the case when the system stops injecting
the required quantity of odorant. This situation is detected by
the control unit, which also prints out the cause of the problem.
To perform maintenance operations specifically trained
staff is required. Only qualified personnel should perform
mechanical/pneumatic interventions, and be well informed of
all instructions related to safety operations, to be met during
any intervention on systems with flammable agents and/or
odorizing liquids.
Washing by means of Natural Gas
The WASHING operation must be completed before
performing any maintenance on the Dosaodor-D odorizing
system. This operation drains out all the odorizing liquid
present in the injection system to facilitate the parts
dismantling of some parts by the operators. The odorant
inside the Dosaodor-D system is placed inside the container.
Only a min. quantity is injected into the line.
Follows this procedure:
a)
Set the key switch to PROGRAMMING - ON.
b)
Set the selector switch to WASHING.
c)
Close the "Low Pressure" inlet/outlet valve
d)
Verify that ALL other valves are open
Press and simultaneously release the PUSH and ALARM
RESET buttons at least 10 times, alternating pauses of 2
seconds between both positions. (This way the odorizing
liquid – in the level gauge - is reinjected into the main tank)
Note: To facilitate the cleaning operation of
delivery piping, open the solenoid injection
valve adjusting screw, mark and record
the operating position of the valve to avoid
having to recheck its previous setting.
e)
Open the "Low Pressure" inlet/outlet valve
f)
Set the selector switch to INJECTOR - 1
g)
Press the PUSH button and keep it pressed in. Set the key
switch to PROGRAMMING – OFF and maintain this posi-
tion for at least 60 seconds. (This way the odorizing liquid
– in the delivery pipes – is reinjected into the gas pipe)
h)
Set the key switch to PROGRAMMING - ON.
i)
If you have the second injector, set the selector switch to
INJECTOR - 2, and repeat the instructions described above.
36
CAUTION
j)
Set the selector switch to EXCLUDED.
k)
Set the key switch to PROGRAMMING - OFF.
At this point all the system valves must be closed and mainte-
nance operations can be performed on the applicable parts.
After completing all operations, restart the system
by reopening the system valves, set the key switch
to PROGRAMMING - ON, set the selector switch to
AUTOMATIC, press the ALARM RESET button and then set
the key switch to PROGRAMMING - OFF.
Filtering Cartridge Maintenance
(see figures 2 and 3 - key 25)
Before replacing the filtering cartridge of
odorant filter (Key 25 - Figure 4), all
devices mounted on the pneumatic panel
must be drained of any odorizing liquid they
may contain.
To do this, follow the instructions reported in paragraph
"Washing Cycle by Means of Natural Gas" section.
After completing the washing operation by gas, close all
on-off valves of the system and proceed as follows:
a)
Slowly loosen the fitting located on the upper part of the
filter (key 25A).
b)
Remove the connection on the upper intake of the
odorant filter (key 25).
c)
Unscrew and remove the upper closing cap (key 25A)
of the odorant filter (key 25).
d)
Remove the cartridge filter (key 25F) by means of a
small screwdriver.
e)
Remove the O-rings (keys 25K and 25B).
f)
REinsert the new cartridge filter (key 25F) and O-rings
(keys 25K and 25B) and place back the closing cap
(key 25A).
g)
Open all valves and make sure that there are no gas
leaks (e.g. by foam, spray).
h)
Restart the system.
Relief Valve Verification and Setting
(see figures 2 and 3)
The relief valve can be inspected and calibrated without
being removed from its position. Follows this procedure:
a)
Set the key switch of the control unit to
PROGRAMMING - ON.
b)
Set the selector switch of the control unit to WASHING.
c)
Close the "Low Pressure" inlet/outlet valve.
d)
Close the odorant inlet valve (key 7) located in the
lower part of the panel.
CAUTION
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