Just been reading about the integral programmer in the IG OV boiler. It seems to be very basic - just two pairs of ON/OFF times per day for the CH circuit, and no facility to differentiate between days of the week.
Further, with the integral programmer, the heat supply to the HW cylinder appears to be controlled purely by the thermostat on the HW cyl, meaning that the HW circuit is live 24 hours every day, and only goes off when the cylinder reaches the set temperature - there is no HW program control like there is for the CH.
Also, it seems the integral programmer only allows the CH circuit and the HW circuit to heat separately, never simultaneously, with priority to the HW circuit. So am I correct in thinking that the integral programmer would never allow the existing 3-way diverter value to operate in its mid position? (My current system is Y plan). Perhaps this arrangement is not such a bad thing, given my HW cylinder is well insulated so would not waste much energy by staying hot 24 hrs a day, but it does rob the system of being able to heat cylinder and radiators simultaneously.
Can anyone confirm if my interpretation is correct? I know I could retain my existing external programmer (which is fairly comprehensive for both CH and HW) and disable the integral one, but I wish there was an electrical diagram in the IG manual to show how to connect the external programmer to the boiler, without having to resort to first principles.
Would really appreciate advice/confirmation on this!
Further, with the integral programmer, the heat supply to the HW cylinder appears to be controlled purely by the thermostat on the HW cyl, meaning that the HW circuit is live 24 hours every day, and only goes off when the cylinder reaches the set temperature - there is no HW program control like there is for the CH.
Also, it seems the integral programmer only allows the CH circuit and the HW circuit to heat separately, never simultaneously, with priority to the HW circuit. So am I correct in thinking that the integral programmer would never allow the existing 3-way diverter value to operate in its mid position? (My current system is Y plan). Perhaps this arrangement is not such a bad thing, given my HW cylinder is well insulated so would not waste much energy by staying hot 24 hrs a day, but it does rob the system of being able to heat cylinder and radiators simultaneously.
Can anyone confirm if my interpretation is correct? I know I could retain my existing external programmer (which is fairly comprehensive for both CH and HW) and disable the integral one, but I wish there was an electrical diagram in the IG manual to show how to connect the external programmer to the boiler, without having to resort to first principles.
Would really appreciate advice/confirmation on this!