21
DHW DEMAND INSTANTANEOUS (jumper JP9 = 1)
When receiving a request by the sanitary flow switch, the circulator is powered and checks
the commands G1, G2, G3, G4 relative to the primary exchanger bringing the supply
temperature to the DHW set point + differential value set through parameter P7. At the end
of the request, the circulator remains powered for a time equal to the value set by
parameter P3.
FUNCTION ECONOMY / COMFORT SANITARY
In ECO mode in the stand-by condition no resistance of the primary exchanger is activated.
When it is active the COMFORT function in stand-by conditions the primary exchanger is
maintained in temperature in order to ensure a prompt response of sanitary. The main heat
exchanger is maintained at a temperature equal to the DHW set point temperature plus a
differential adjustable via the parameter P7.
REQUEST HEATING
At the closing of the room thermostat contact, if the board is in winter mode, the system
pump is only activated if the primary exchanger temperature is higher than the set
temperature using the parameter P6. If the temperature value detected by the primary
exchanger probe is lower than the flow temperature setpoint set, the triacs are turned on in
sequence according to the power required. This only occurs after a time set by parameter
P5, to allow for example the opening of eventual zone valves. The instantaneous power of
the boiler and the control of the triac G1÷G4 is by PID controller. At the end of the request,
the circulator remains powered for a time equal to the value set by parameter P4.
DEGASSING FUNCTION
During the degassing function activated by simultaneously pressing the MODE (J4) button
and ON / OFF (J7). During this function it is alternating operating states of maximum and
minimum speed of the circulator PWM in order to facilitate the escape of air bubbles from
the hydraulic circuit. The sequence is illustrated below.
When this function is active the display shows a timer that signals the time for the end of
the function.
Vel. MAX
(15 sec)
Vel. MIN
(20 sec)
Vel. MIN
(120 sec)
Vel. MAX
(5 sec)
Vel. MIN
(5 sec)
2 cycles
60 cycles
