45
CENTRAL HEATING MODE:
When heating demand is requested by the time clock (and thermostat) the boiler will
fi
re
automatically. An integral pump is then energised and hot water from the boilers primary
circuit is circulated around the heating systems pipe-work and radiators. The heat output from
the boiler is automatically adjusted by the boiler’s internal control unit to match the heating
demand. As the water temperature of the heating system increases the
gas input to the burner decreases, conserving energy and increasing
ef
fi
ciency. When the demand for heating no longer exists, either the room
thermostat is satis
fi
ed or the heating period has ended, the burner will
shut down and the boiler will revert to stand-by, waiting to respond to the
next heating demand. The integral pump may continue to run after shut
down for a short while to dissipate any excess heat within the boiler.
ACCESS TO THE BOILER CONTROLS:
The boiler controls are sited at the bottom of the
boiler’s front case. (See
fi
gure 2)
Figure 2
BOILER CONTROLS
The function and operation of the main controls located on the control panel fascia (
fi
gure 3)
is as follows:
Figure 3
1- Analogue Timer
4- C.H. Pressure Gauge
2- C.H. Temperature Control
5- LCD Display
3- Function Switch
1. Pressure Gauge :
Shows water pressure in the system. Scale from 0 - 4bar.
Recommended water pressure in system 1.5bar.
2. Central Heating Temperature Control :
The position of this control dial will determine
the temperature of the water delivered to the radiators. The water temperature can be set
from a minimum of 30ºC (anticlockwise stop position) to a maximum of 85ºC (clockwise stop
position), unless the boiler is adjusted for under
fl
oor heating operation when the maximum
setting is 60°C.
3. Function Switch :
This is the boilers main operating switch. In the
position the boiler is
in stand-by mode and power supply is ON. For the boiler to operate the switch must be in the
position.
Summary of Contents for SARGON 18S
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