Turn off both the Hot Water and Heating on the Programmer. The Boiler should stop firing, and the primary pump stop - on systems where the boiler uses a pump over-run, the pump may not turn off for a few minutes.| 7.10.4 Turn off both the Hot Water and Heating on the Programmer. The Boiler should stop firing, and the primary pump stop - on systems where the boiler uses a pump over-run, the pump may not turn off for a few minutes. |
| 7.10.5 Bleed the entire system to remove air. |
| 7.10.6 Turn the Hot Water ON to allow the cylinder to fully recover. As it does, adjust the Balancing Valve on the Flow (or return) to the Primary Coil to obtain a temperature difference of approximately 10°C (or as specified in the Boiler Installation Instructions) between the Boiler Flow & Return. |
| 7.10.7 Check that the water level in the Feed & Expansion Tank is at least 25mm below the overflow (once the unit has FULLY recovered). If necessary, adjust the position of the Ball Valve Float to obtain this. |
| 7.10.8 Once the cylinder has recovered, check that hot water is available at all outlets. |
7.10.9 Thermostatic Control of Hot Water Temperature
  The Valve is adjustable from 27°C to 67°C, and has a lockable head, as shown. Typically the valve should be set to obtain a supply temperature of 65°C, to protect against Legionella. Check the setting of the Thermostatic Blending Valve by opening a hot water outlet to a low flow rate (approximately 10 litres per minute) and measuring the output temperature. The head of the Blending Valve may be locked in position if required.The graph shows the pressure drop across the valve for various hot water flow rates. |
| 7.11 Set the Room Thermostat as required. |
| 7.12 Should the incoming mains flow rate exceed the maximum transfer rate for the domestic heat exchanger, the hot outlet temperature will drop. This can be corrected by adjustment of the stop cock on the incoming mains to achieve a flow rate off approximately 26 litres/minute. |
| 7.13 Check that a copy of both the Installation / Users Instructions is left with the Heat Bank Thermal Store, or occupier, as required. |