1. Collector	7. Check Valve	12. Pressure Relief Valve
2. Collector Sensor	8. Hose Bibs for Filling and Flushing	13. Pressure Gauge
3. Manual Air Valve	9. Expansion Tank	14. Collector Supply
6. Collector Return	11. Circulating Pump with flanges or couplings

Operation:

• The Controller will switch on the pump when the temperature at the collector sensor TC is higher than the return temperature TR by at least the pre selected amount.

• The pump circulates a heat transfer fluid around the loop.

• Heat from the collector is transferred to the storage tank through the heat exchange coil.

• With the pump running, if delta T is less than preset value, the pump will switch off.

• When a preset tank temperature is reached at TMAX, the controller can switch off the pump.

• The check valve (non-return valve) prevents heat from the tank rising towards the collector should the tank be warmer (e.g. at night).