Installation manual

6
BASIC OPERATING PRINCIPLE
The boiler and water heater are installed together to supply the property with heating
and hot water.
Boiler.
The boiler can be controlled by a wireless room stat or an Opentherm controller.
When the room is below temperature the boiler will come on to heat it up. The boiler
is fully modulating so as the return water temperature increases and the room warms
up the unit will reduce the gas input.
A weather compensation system is used to increase the efficiency of the system by
reducing the temperature set point of the boiler when the ambient outside
temperature increases.
Water Heater.
The water heater is used to supply the taps and outlets with hot water. It is a fully
modulating, high capacity unit that perfectly controls the outlet temperature. It allows
the user to control the temperature with a series of remote controllers. Once the
temperature is set the hot tap can be used without the need for mixing cold in at the
point of use. More than one outlet can be used without fluctuations of temperature.
The high capacity of the unit will allow multiple showers or outlets to be run at once
without sacrifice of the hot water.
Flow Switch.
A flow switch is used on the cold pipe of the water heater to control the Twin Flow
system. If the flow rate exceeds 5 L/min the flow switch contacts will open. This will
cause the boiler to extinguish and go into stand by mode. This means that although
the maximum potential gas consumption of the system is 86kW, which exceeds the
supply from a U6 domestic gas meter, the system will never draw more than the
input of the water heater (54kW.) This will consume 5.05 m
3
/hr and still leave almost
1 m
3
/hr available for any small gas appliances such as cookers or gas fires.