2. System Operation Overview
There are four modes of operation to the Solar 3C system – domestic hot water delivery, space
heating, water heating from the boiler, and heating and hot water demand.
It is assumed that the solar collectors and associated controls have been fitted to the solar coil.
2.1. Domestic hot water delivery
Domestic hot water required is supplied to the hot water outlets directly from the Solar 3C Cylinder.
This water will have been heated either exclusively by solar energy or by a combination of solar
energy and heat from the boiler (typically during the winter months or other cold periods).
The temperature of the hot water is set by a combination of the solar sensors, the thermostat on the
hot water cylinder and the heating timer. When the timer indicates that hot water is likely to be de
manded the water temperature is raised to the hot water temperature of 55˚C for supply to baths,
showers and sinks.
2.2. Heating the dwelling
Solar 3C is specifically designed to carefully balance the available heating sources (cylinder/
boiler/heat pump) so as to maintain the desired target/room temperature as effectively and
efficiently as possible, maximising the use of any available solar yield. In normal operation, (fig 2)
the Solar 3C weather compensator controls the Solar 3C Jig pump and zone valve to achieve
the required internal room temperature. External temperature, desired room temperature and the
cylinder temperature are all taken in to account during this process.
When there is heating demand and insufficient energy or temperature within the Solar 3C Cylinder
(as recognised by the Solar 3C Control Panel) the back-up boiler/heat pump will automatically be
activated to provide the heat for the system. When there is sufficient energy or temperature within
the Solar 3C Cylinder, the back-up boiler/heat pump will automatically be switched off. The zone
valve on the Solar 3C Jig will open, allowing the top/output coil of the Solar 3C Cylinder to provide
the necessary temperature/energy to the heating circuit. This will cool the Solar 3C Cylinder
promoting greater yield input from the solar collectors.
4
For illustration purposes only.
Summary of Contents for 3C382B
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