20
6 SYSTEM OPERATION
Fig. 21
5.5
USER INFORMATION
The User must be advised (and demonstrated if necessary) of the following important points:-
1.
How to turn the Solar Smart system on and off. It is recommended the system is always left on.
2.
Explain what information is shown on the display and in the unusual case of a fault occurring, explain the fault codes that
may be shown.
3.
How important it is for the combination boiler hot water thermostat to be left at the maximum position (No. 9) and that it is
the purpose of the label (Fig. 16) to maintain this and that the label must not be removed.
4.
Show the User the position of the pressure relief valve discharge pipe.
5.
Explain the importance of regular inspection to check the safe and efficient operation of the system.
6.
Leave these instructions with the User for use on future calls and for recording details in the Inspection History Section 11.
Solar cylinder
Cylinder
temperature
sensor
Lower cylinder
temperature
sensor
Collector
sensor
Solar collector
Drain back unit
Heat exchanger
Drain back
unit pump
Cylinder
pump
Mains cold water inlet
Warm water to boiler
Hot water to taps
Solar valve
Alpha SolarSmart 90 - System Operation
6.1
WORKING PRINCIPAL - Fig.21
The solar collector uses the energy of the natural light to heat the water being circulated around the collector. When the
heated water enters the drain back unit, heat is transfer into the stored water via a heat exchanger coil. Stored domestic
hot water is pumped from the bottom of the solar cylinder through the drain back unit heat exchanger coil where it is
heated and returned to the cylinder.
When a hot water tap is turned on mains water flows into the bottom of the solar cylinder and hot water flows out of the
top towards the solar valve at the boiler. If the water from the cylinder is above 60°C the solar valve diverts the flow
directly to the tap, if the flow is less than 60°C the valve diverts the flow through the combination boiler. When the flow is
via the combination boiler the water temperature is maintained by the boiler. As the temperature of the water entering the
boiler is higher than the normal incoming mains water, less gas is required to heat it to the required temperature thereby
saving energy costs.
