Riello PRESS 45 N/ECO Installation, Use And Maintenance Instructions page 30

IMPORTANT NOTES
If the pre-heater thermostat or the resistor in contact with
the probe should be replaced, the probe has to be posi-
tioned in contact with the resistor and with the pipes of the
last aluminium plate, after loosening of the fixing screws
of the aluminium plate packs, see drawing.
If during the operation exceptional differences or temper-
ature peaks that are too high should be detected, verify
the continuity of the resistor, using and ohmmeter in con-
tact with the temperature probe (approximately 35 Ohm).
Use only filters marked with a groove on the tightening hexagon.
NOTES
 The pre-heater might be fitted with a second maximum value contact thermostat.
That thermostat can be used to act on an external contact maker by means of a switch to cut off the current
from the pre-heater, in case of excess temperature (Kit code no. 3000800).
The resistor R placed on the atomiser holder is wired to the supply line of the pre-heater (see page 4).

When the burner is off, the pre-heater supply line shall remain fed.
Should the pre-heater line be turned off, the fuel must be pre-heated for approximately 30 minutes before the
burner start-up. On the contrary, the nozzle-holder resistor shall be supplied with an independent single-phase
line, protected by a fuse of 1A.
This line shall never be switched off, when the burner is off.
Before the burner start-up, verify that the pump is filled of fuel in order to avoid any idling for too long time.

 Filter cleaning:
periodically clean the filters in order to avoid any trouble in the burner operation.
 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.) (5, fig. 1).
Pre-heater filter (10, fig. 1):

positioned in the delivery line, it causes a decrease of the atomisationing pressure which is detectable by
use of a manometer (12, fig. 1).
MANOMETER PROTECTION VALVE
After atomisation pressure has been checked, it is recommended to cut out the manometer (12, fig. 1) to avoid
pressure shocks that it might be subjected to at every burner start up.
To achieve this, close the protection valve when the burner is not working and the manometer indicates 0 bar.
6193
Plate
D2751
8
GB
Aluminium plate pipes
Resistor
Thermostat probe