6194
8
GB
IMPORTANT NOTES
Pre-heater thermostat replacement.
Replace the probe of the new thermostat, after loosen-
ing the fixing screws of the plates pack, taking care of
better contact between the probe and the pipes and the
resistor, see drawing. The same precautions should be
taken when renewing the resistors in contact with the
thermostat probes.
If during operation exceptional changes or excessive
temperatures should be detected, verify the continuity
of the resistor, using and ohmmeter, in contact with the temperature probe (approximately 35 Ohm).
Use only filters with a groove on the tightening hexagon.
NOTE
y
The pre-heater might be provided with a second thermostat in contact of maximum value.
This thermostat can be used to act as a switch on an external contact maker to cut off the current to the pre-
heater if there is excess temperature (kit code no. 3000800).
y
Before burner start-up, verify that the pump is filled with fuel to prevent it running empty for too long.
y
Filter cleaning:
periodically clean the filters in order to avoid any burner operation problems.
y
Supply line filter:
positioned on the suction line, it causes the increase of the vacuum in the pump with the consequent flow of
gas and noise. Do not exceed the vacuum of 38 cm Hg (5 m W.c.), measured at the vacuometer fitting
(5, fig. 1).
y
Pre-heater filter (10, fig. 1):
positioned on the suction line, it causes a decrease of the atomising pressure which is detectable by use
of a manometer (12, fig. 1).
MANOMETER PROTECTION VALVE
After atomisation pressure has been checked during opportunity, the manometer should be turned off (12, fig. 1)
to avoid the pressure shocks that it might be subjected to each time the burner is turned on.
Close the protection valve when the burner is not in operation and the manometer indicates 0 bar.
Thermostat probe
Resistor
Aluminium plate pipes
Plate
D2751
