Have a Heatslave 15/19 and have a problem in that when the 2 channel programmer is set to hot water only (CH off) some of the rads still get hot.
The diverter valve (Has a Drayton ZA3 actuator on it) runs to the HW position when demand for HW is given, when the demand stops the boiler goes off and the valve runs back to the HW/CH position. I realise this is opposite to normal convention but my question is should it stay in the HW position when there is no demand but the timer is still "ON" thus preventing hot water going to the rads (I assume by gravity/convection as the pump is off) ?
The diverter valve (Has a Drayton ZA3 actuator on it) runs to the HW position when demand for HW is given, when the demand stops the boiler goes off and the valve runs back to the HW/CH position. I realise this is opposite to normal convention but my question is should it stay in the HW position when there is no demand but the timer is still "ON" thus preventing hot water going to the rads (I assume by gravity/convection as the pump is off) ?