4.1.1
Adjusting maximum pressure
Proceed as follows to set the maximum
pressure (fig. 10):
- Connect the column test pressure to
the socket which, in the case of the
‘3/6 OF-3/4 OF PVA’
models, is loca-
ted on the burner manifold. For the
‘7/12 OF’
model connect the column
test pressure to the pressure inlet
downstream of the gas valve instead
(8, fig.9).
- Remove the coil and tighten the screw
all the way (4)
– Set the thermostat knob to the maxi-
mum value.
– Turn on the power supply to the boiler.
– Slacken lock nut (1) and turn union (3):
turn the union (3) anti-clockwise to
reduce pressure, or clockwise to
increase it.
– Tighten lock nut (1).
– Turn on the main switch repeatedly,
checking that pressure corresponds
to the values specified in Table 1.
4.1.2
Adjusting reduced pressure
Proceed as follows to set the reduced
pressure (fig. 10):
- With the coil that needs to be connec-
ted, the thermostat regulator must be
set to the maximum rate and the boi-
ler turned on, turn the screw (4) sear-
ching for the pressure rate indicated
on Table1:
In order to reduce pressure, turn the
screw anti-clockwise; in order to
increase it, turn the screw clockwise.
- Relocate and remove the coil in order
to check whether the maximum and
minimum pressures correspond to
the imposed rates.
4.2
TRANSFORMATION TO
ANOTHER TYPE OF GAS
A kit is supplied containing everything
required for transformation to propane
gas (G31). For the transformation from
one gas to another, you have to:
- Turn off the gas cock .- Replace the
main nozzles with those included in the
kit, interposing the washer of alumi-
nium o 10 (for this operation use an
open-ended spanner of 12).
- Remove the main feeder connection
and replace the nozzle supplied in the
kit.
-
In the models which have the gas
valve ‘VR 4601’ replace the pressure
switch of minimum rate calibrated
when upstream, at 16,5 mbar and
when downstream at 11,5 mbar (4
fig. 2-2/a) with the pressure inlet,
cod. 6043115 for G31, calibrated
when upstream at 27 mbar and
when downstream at 22 mbar. In the
models with a gas valve ‘VRB 25PA’
instead, turn the knob of the mini-
mum rate pressure (9 fig.9) chan-
ging the rate from 11,5 mbar for
G20 to 22 mbar for G31.
- In order to regulate the power heat fol-
low the instructions of 4.1
Once the operating pressures have
been changed, seal the regulators.
- Apply the plate provided in the kit for
identification of the gas for which the
boiler is set up to the skirt.
NOTE: All gas connections must be
tested for seal using soapy water or
products intended for the purpose
after assembly. Do not use open flame.
The operation must be undertaken
exclusively by authorized personnel.
4.3
CLEANING AND
MAINTENANCE
At the end of each heating season pre-
ventive maintenance and checking of effi-
cient operation of equipment and safety
devices must be carried out exclusively
by authorized technical personnel.
4.4
FAULT FINDING
The main burner burns badly: very high,
yellow flames
- Check whether the pressure of the
burner’s gas is regular
- Check whether the burners are clean
Radiators get hot even during summer
period
- Check whether there are impurities in
the area of the reserve valve
- The reserve valve is faulty, so provide
for replacement.
The boiler’s safety valve intervenes fre-
quently
- Check whether the pressure at which
the heating system i--sled with cold
water is too high, comply with the advi-
sable rates.
- Control whether the safety valve has
been loosened, if so, replace it
- Check the pre-inflation pressure of the
expansion tank
- Replace the expansion tank
The boiler works but the temperature
does not rise
- Check whether the quantity of gas
consumed is inferior to the scheduled
one.
- Control whether the boiler is clean
- Check whether the boiler is proportio-
nate to the heating plant.
33
IT
GB
FR
BE
DE
EKO
3/12 OF
EKO 3/4 OF PVA
Methane - G20
Burner’s maximum pressure
mbar
13,8
13,8
Burner’s reduced pressure
mbar
7,0
7,0
Propane - G31
Burner’s maximum pressure
mbar
35,5
35,5
Burner’s reduced pressure
mbar
26,9
26,9
TABLE 1
KEY
1
Lock nut
2
Coil
3
Adjusting maximum pressure
4
Adjusting reduced pressure
Fig. 10
