Installation, use and maintenance guide
PIDRA 18
Page
49
ENG
12
–
INFORMATION FOR THE SKILLED TECHNICIAN
12.1 MAIN COMPONENTS AND THEIR POSITION
SMOKE PRESSURE SWITCH
This is a safety switch that stops the screw feeder motor whenever necessary. The main cause for the pressure switch tripping is a
blocked flue outlet or smoke exhaust pipe. Note that it is strictly forbidden to apply any kind of mesh screen to the end of the pipe.
When the holes of the mesh clog up they create a plug that trips the pressure switch which stops the pellet feeder.
SCREW FEEDER MOTOR
This motor is powered at regular on/off intervals controlled by a microprocessor. The operation of this motor is affected when: The
motor's thermal cutout trips; the pressure switch trips due to blocked smoke exhaust; the generator is shut down intentionally or the
heater shuts down because it runs out of pellets; the manual reset thermostat trips.
SMOKE SUCTION UNIT
This is activated when the start up signal is given. Initially it activates at the maximum capacity, and then self adjusts to the optimal
speed. To enable the evacuation of the smoke and for greater safety of the system, the smoke suction unit continues to operate for
a preset period of time from when the appliance shuts off.
BRAZIER CLEANING MOTOR
This is a patented system that creates a continual movement of the combustion pellets inside the burner which consequently cleans
the burner.
SMOKE SENSOR
Continually detects the outgoing smoke temperature. It authorises the passage from the Start stage to the Work stage.
EXPANSION TANK
This is a safety device for the appliance used to compensate the increased water volume in the appliance due to its increasing
temperature (Attention: this tank is intended solely as protection for the appliance).
SAFETY THERMOSTAT WITH MANUAL RESET
When the temperature exceeds 98°C the pellet feed screw shuts down. After having verified and solved the causes for the
overtemperature, reactivate the appliance by unscrewing the plastic cover of the thermostat and press the button (the temperature
of the appliance must have dropped considerably).
SPARK PLUG
It is activated in the START phase. It heats the incoming air to the brazier up to 800°C, which promotes the first combustion of the
pellets in the brazier.
AUTOMATIC PURGE VALVE
The function of this valve is to eliminate air residues inside the appliance body without the need for manual intervention.
Consequently problems such as the following are eliminated:
• corrosive processes caused by the oxygen • noise generated by the passage of air in the tubes • air pockets in the heating bodies
• cavitation in the circulator pumps.
SAFETY VALVE CALIBRATED AT 3 BAR
When the calibrated pressure is reached, the valve opens and, by discharging to the atmosphere it prevents the pressure in the
system from reaching dangerous limits for the generator and for the components of the system. If it trips verify the reasons and
solve the causes for the overpressure.
It is recommended to connect this valve to an outlet to avoid damaging the material around the appliance and to prevent damage
caused by hot water under pressure.
SYSTEM CIRCULATING PUMP
This device conveys hot water produced by the appliance to the usage points. The circulating pump signal appears to indicate that
it is operating.
12.2 GUIDELINES FOR CORRECT INSTALLATION
• Read this instruction booklet.
• The appliance must always be switched off from the control panel. It is forbidden to switch off the appliance by means of the main
switch 0/I.
• The appliance must never be disconnected from the electrical power supply and the power supply must never be cut off during
normal operation. Whenever the appliance is deliberately disconnected from the electric power supply smoke could be emitted into
the room.
• Do not install the appliance with horizontal wall outlets only: Evacuation of products of combustion by natural draught must always
be guaranteed as well. Unsuitable installation of the outlets could cause a forced shut down of the appliance due to overpressure of
the exhaust smoke caused by a gust of wind.
