Operation Adjustment And Gas Flow Regulation - termovana Stella Installation, Maintenance And User Manual

Warning
As the burner is continuously powered, even when the switch is in "OFF"
position, make sure that the power supply is cut off before carrying out any
operation on the burner.
The gas cock fitted in the boiler should also be closed.
The "STELLA" boiler allows:
• The heating circuit temperature to be adjusted using a knob (1).
• The hot water circuit temperature to be adjusted using a knob (2).
In order to gain access to the area reserved for disconnecting the accessory parts and
calibrating the boiler, follow this procedure:
• Remove the front housing.
• Pull out the control box (pay special attention to the wiring, mainly when refitting the
box).
• Now it is possible to reach electronic board and control cables to do the normal
maintenance and to replace the fuse.
• Unscrew screw "A" (see Page 14 ELECTRIC DIAGRAM) of pressure connection
and connect a suitable pressure gauge
• Remove the heating sensor from the input pipe using the attachment spring and set
it on the bottom of the furnace without disconnecting it
• Return the external switch to the "ON / 1" position and turn the furnace on in the
heating setting
• Remove the safety screw "C" (see Page 14 ELECTRIC DIAGRAM) and rotate the
internal plastic screw counter-clockwise a few turns until, when turning the pressure
does not decrease any further
• At this point, act on "D" until the minimum pressure is reached as indicated in the
data table for the gas used (page 30 in this booklet)
• Once the minimum pressure is adjusted, the maximum pressure is adjusted by
turning the internal plastic screw located under the safety screw, "C" until the
pressure is reached as indicated in the data table for the gas used (page 30 in this
booklet)
• Turn the external switch to the "OFF / 0" position
• Reseat the safety screw "C" paying careful attention to tighten it sufficiently in order
to avoid possible gas leaks; tighten screw "A" in the same manner
• Return the heating sensor previously set on the bottom of the furnace to the input
pipe, paying careful attention that the contact plate perfectly adheres to the pipe
and that the spring is not out of line
Warning
Fully tighten all the openings used to carry out gas pressure readings or
regulation.
20
Operation Adjustments
Gas flow regulation