I have the VR66 which controls both valves, the boiler controls the pump, (exact setup depends on if you are 4xx/6xx/8xx ecotec, on 4xx you need...
Some people at one time would put the boards in the oven to reflow them (without proper reflow ovens you can kill the board completely) with play...
Check the status code the boiler is running at when flow temp is not high, it could be s53 (i think) too much differencr in flow temp, then it...
Unless you can be sure of all the piping joints under the floors etc is good, ide leave it as unpressurised as you do not want a weak joint popping.
Have you got Vailant ebus controls ie a VRC?
Water is freezing at the moment, how long is you HW on for in the morning?
Setting temp higher will not change how much fuel you use as it will just use it over a longer timeframe vs in the morning. What it will do is...
Might be little you can do if your boiler can not modulate any lower vs the heat loss, ie if you need 3kw to maintain temp but boiler can not go...
Also you loose less heat in pipes if flow temps are lower, useful if you pipes are, under floors or enclosed etc.
WC weather compensation If you have you boiler sized too high and its not scaled back then it will heat up the water too quick for the heat lost...
Reduce the flow temp first and look if you can get WC controls to dynamically change flow temps, also check if boiler has been scaled correctly...
Using a VRC is slightly different as you do not toggle the boiler trigger as its always bridged and eBus just tells it to not fire. Im sure there...
The VR66 does not have any feedback from the valves, it never knows if they are open/closed, it only assumes that they are open when powered. This...
So you keep your HW tank at full temp 24/7 or do you switch the cyl stat wire? VR66 does not need to inhibit CH as it handles both valves, so it...
d78 does not do anything without VR66 on an regular 4xx boiler, if you have a system boiler then it has the hardware internally to switch between...
You connect the 2 or 3 port valves to it and also the CylStat or NTC. You can use it without full eBUS controls (ie manual programmer) but it...
You can't without VR66 but then you loose CH control. It has to do this to prevent temp differential across the heat exchanger which causes...
To add additional clarification, ebus does not control power output as stated, the boiler does that internally to maintain the target flow temp...
D00 is the max the boiler ever goes to regardless of ebus, there is another setting for max kw for HW when using ebus.
There is no exact way of knowing unless you have calculated your losses, if you have an 18kw now and plan on another 10 radiators you could get...
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