Ariston PH640MST NG Operating Instructions Manual Download Page 4

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Check that the pressure of the gas supply is consistent

with the values indicated in Table 1 (“Burner and nozzle
specifications”). This will ensure the safe operation and
longevity of your appliance while maintaining efficient
energy consumption.

Connection with a rigid pipe (copper or steel)

Connection to the gas system must be carried out in

such a way as not to place any strain of any kind on the
appliance.
There is an adjustable LLLLL-shaped pipe fitting on the
appliance supply ramp and this is fitted with a seal in
order to prevent leaks. The seal must always be replaced
after rotating the pipe fitting (seal provided with
appliance). The gas supply pipe fitting is a threaded 1/2
gas cylindrical male attachment.

Connecting a flexible jointless stainless steel pipe to a
threaded attachment

The gas supply pipe fitting is a threaded 1/2 gas
cylindrical male attachment.
These pipes must be installed so that they are never
longer than 2000 mm when fully extended. Once
connection has been carried out, make sure that the
flexible metal pipe does not touch any moving parts and
is not compressed.

Only use pipes and seals that comply with current

national regulations.

Checking the tightness of the connection

When the installation process is complete, check the

pipe fittings for leaks using a soapy solution. Never use a
flame.

Adapting to different types of gas

To adapt the hob to a different type of gas other than
default type (indicated on the rating plate at the base of
the hob or on the packaging), the burner nozzles should
be replaced as follows:
1. Remove the hob grids and slide the burners off their

seats.

2. Unscrew the nozzles using a 7 mm socket spanner,

and replace them with nozzles for the new type of gas
(see table 1 “Burner and nozzle characteristics”).

3. Reassemble the parts following the above procedure in

the reverse order.

4. Once this procedure is finished, replace the old rating

sticker with one indicating the new type of gas used.
Sticker are available from any of our Service Centres.

• Adjusting the burners’ primary air :
Does not require adjusting.

• Setting the burners to minimum:
1. Turn the tap to the low flame position.

2. Remove the knob and adjust
the adjustment screw, which is
positioned in or next to the tap
pin, until the flame is small but
steady.

3. Having adjusted the flame to the required low setting,

while the burner is alight, quickly change the position of
the knob from minimum to maximum and vice versa
several times, checking that the flame does not go out.

4. Some appliances have a safety device (thermocouple)

fitted. If the device fails to work when the burners are
set to the low flame setting, increase this low flame
setting using the adjusting screw.

5. Once the adjustment has been made, replace the seals

on the by-passes using sealing wax or a similar
substance.

If the appliance is connected to liquid gas, the regulation

screw must be fastened as tightly as possible.

Once this procedure is finished, replace the old rating

sticker with one indicating the new type of gas used.
Stickers are available from any of our Service Centres.

Should the gas pressure used be different (or vary slightly)

from the recommended pressure, a suitable pressure
regulator must be fitted to the inlet pipe (in order to comply
with current national regulations).

DATA PLATE
Electrical
connections

see data plate