19
6
SYSTEM OPERATION
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. 17) 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.
Ensure the Checklist in Section 11 has been completed after the unit has been installed and commissioned.
7.
Leave these instructions with the User for use on future calls and for recording details in the Inspection History Section
13.
Alpha SolarSmart 150 - System Operation
6.1
WORKING PRINCIPAL - Fig.22
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 temperature 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 the water to the set
temperature of above 60°C thereby saving energy costs.
Fig. 22
Collector
Collector sensor
Cold water inlet
Warm water to boiler
Cool water to DBU
Warm water from DBU
Collector pump
System pump
Heat exchanger
Control PCB
Upper cylinder sensor
Lower cylinder sensor
Solar cylinder
Drain back unit
Hot water to taps
Solar valve
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