15
2.5
SETTING THE NOMINAL LOADS
The nominal loads have been set at the correct values at
the factory.
Dangerous situations can develop if the instructions
below are not followed meticulously. Setting the nominal
load is only necessary during burner pressure control. If
the burner pressure or loads must be checked, the
procedure below must be followed:
1
Shut down the heater by pressing the red button on
the gas control block.
2
Connect a U-pipe manometer to the pressure test
nipple to measure the burner pressure on the
manifold.
3
Activate the heater and allow the burner to ignite.
4
Check the burner pressure. If necessary, reset it by
means of the burner pressure adjusting screw (see
diagram 12). Turning it anti-clockwise as far as it will
go, reduces burner pressure. Turning it clockwise,
increases burner pressure.
5
Shut down the heater, remove the U-pipe manometer
and close the pressure test nipple.
6
Restart the heater.
2.6
CONVERSION TO ANOTHER GAS
Attention: mount a gas cock which is suitable
for the gas supply to be used.
If the heater has to function on a gas category (LP gas or
natural gas) other than the gas set as standard (ex
works), the heater must be converted to the applicable
gas category with the conversion kits provided.
Diagram 12 – Setting the nominal loads/burner
pressure
Only an accredited installer may convert the heater. Al
the injectors of the bar burners and the pilot light must
be replaced.
All natural gas units require a burner pressure regulator,
but LP gas units do not. The burner pressure regulator,
but LP gas units do not. The burner pressure regulator
of the gas control block (if present) must be dismantled
when converting the heater for the use of LP gas. The
burner pressure regulator must be mounted on the gas
control block when converting to natural gas. The table
below shows which injectors must be mounted for the
gas in question.
The following procedure should then be followed
meticulously:
1
Shut the heater down. Close the main gas tap in the
gas supply and switch off the electricity supply at the
main switch.
2
Dismantle the bar burners including the bar burners
including the bar burner on which the pilot light is
mounted. To do this, dismantle the pilot light gas
pipe and the thermocouple connection of the gas
control block.
3
Replace the injectors in the manifold and the pilot
burner with the injectors from the appropriate
conversion kit. Use the table on page 22 to check
that the diameter of the injectors is correct
4
Remount the bar burners.
5
Reconnect the pilot light gas pipe and the
thermocouple connections to the gas control block.
6
Converting from natural gas to LP gas:
-
Dismantle the burner pressure control on the gas
control block. Remove the burner pressure
control and replace it with the flat covering plate
with sealing packing in the conversion kit for LP
gas (see diagram 13).
-
Replace the gas cock by one, which is suitable
for LP gas installations.
-
Open the main gas tap.
-
Check the burner pressure
Diagram 13 – Dismantling the burner pressure control