7.4.3 Thermostatic Control of Hot Water Temperature
The unit is fitted with a Mixcall III Thermostatic Blending Valve, to control the hot water temperature, and prevent scalding. | Control Knob Position | Min | 1 | 2 | 3 | 4 | 5 | 6 | 7 | Max | Outlet Temp. (°C) | 27 | 32 | 38 | 44 | 49 | 53 | 58 | 63 | 67 | | 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. |