36
To obtain central heating only
- Turn the selector switch 25 to the «
» position, the green LED
29 will light.
- Ensure that the time clock is on (see Section 4), and if fitted that
the room thermostat is calling for heat.
- The control knob 27 «
» allows you to adjust the water
temperature in the central heating circuit according to seasonal
requirements.
- Turn the control knob 27:
- Clockwise in cold weather
- Anti-clockwise in mild weather (by turning the knob too far, the
Central Heating will switch off).
- The LEDs 28
will display the temperature of the water in the
central heating circuit.
- Furthermore, if your home is fitted with a room thermostat, set it
to the desired indoor temperature.
- The orange LED 30 will light each time the burner operates.
Stopping the central heating
- Turn the selector switch 25 to the “
” position. In this state the
boiler will only produce domestic hot water,alternatively, you can
turn the time clock off or if fitted turn the room thermostat down.
Stand-by mode
- Turn the selector switch 25 to the «O » position, the green LED 29
will remain alight. The appliance will remain in stand-by mode
unless the anti-frost device is activated.
Turn off the appliance*
- Turn the selector switch 25 to the «O» position
- Turn off the external power supply to the boiler.
* N
OTE
: I
N THIS STATE THE APPLIANCES ANTI
-
FROST DEVICE IS INACTIVE
The boiler is fitted with a device, which in the event that the water
temperature falls below 8
o
C the pump activates and runs until a
temperature of 18
o
C is attained. In the event that the water
temperature falls below 3
o
C, the diverter valve switches to Domestic
Hot Water and the burner fires on minimum power until a
temperature of 33
O
C is attained.
This device is only activated when the boiler is operating perfectly
and
-
the system pressure is sufficient;
-
the boiler is powered electrically;
-
gas is available.
15.6
Sequence of Operation
Central Heating Mode
(Unless the hot water cylinder is being heated), when the time clock
and room thermostat are calling for heat, the pump starts. When all
other demands are in operation and the safety devices are satisfied
(eg. fan and air pressure switch) the burner goes through an ignition
sequence. Once the flame is detected by the ionisation system, for
the initial 30 seconds of operation the electronics monitor the
∆
T
o
between the flow and return NTC’s to ensure there is a correct flow
through the appliance.
- If the
∆
T
o
is less than 40
o
C the central heating cycle continues.
- If the
∆
T
o
is equal to or more than 40
o
C, or if the return
temperature is more than 10
o
C above the flow temperature
then the burner switches off and the relevant error code is shown
on the display.
The flow NTC adjusts the output of the boiler by modulating the
burner between the minimum and maximum pressure.
Summary of Contents for GENUS 30 Plus
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