Grant Solar Thermal Accessories

The Grant GSD1 and SDC306 Differential Solar Controllers automatically manage the operation of the Solar Thermal System. Monitoring the temperature in both collector and cylinder, they operate the circulating pump only when the difference in temperature will provide efficient heating of the hot water. They will also stop the circulating pump if the temperature in the collector exceeds the maximum set or, if the cylinder has reached the required temperature.

The Grant GSD1 controller is used where the collectors are located on the same side of a roof – such as with a South facing installation, whereas the Grant SDC306 is used where the collectors are located on either side of a roof – such as with an East/West facing installation.

Both solar controllers monitor and display the amount of solar power produced by the system on a daily and cumulative basis. Amongst other features the SDC306 controller can display the collector and cylinder temperatures and also incorporates a pump kick facility which activates the pump for a short period each day to prevent the possibility of seizure if not operated for more than 24hrs.

Expansion vessel

The 18 litre expansion vessel, connected to the Solar Pump Station by a flexible hose, incorporates a special membrane selected to withstand the higher temperatures found in solar thermal systems.

Solar Fluid

The Grant Solar Fluid is an odour-free, non-toxic 40/60 glycol/water solution, developed specifically for Solar Thermal applications to protect systems from freezing. The nitrate, phosphate and ammonia free fluid has been formulated to remain stable over long periods of time and is also a good corrosion inhibitor. It is available ready mixed in 10 or 20 litre packs.