How to questions - Baxi Duo-tec HE A 24

[burnsey]

Hello All,
About a year ago the father in-law fitted our boiler and promised he would return to fit the TRV and then fill the system with an inhibitor. Well a year on and it's still not done so I'm going to give it a go myself as I would like to get the boiler serviced. My questions are as follows.

Q1, How do I drain the water from the boiler and then the rads. The upstairs rads stangely enough have TRV but the down stairs doesn't so I'm assuming it's a full system drain required.

Q2, Should I remove the rad's from the wall and wash / flush the insides out.

Q3, I have a bottle of liquid inhibitor. Do I put this in the boiler somewhere or inside the rads. If its the rads am I ok just putting it in the ones down stairs whilst I put the TRV's back on. Should I stick it all in one Rad or divide it amongst them all on the GF?

Q4, Is there any special requirements when refilling the system?


Greatfull for any help but please keep it in laymans terms if possible.

Regards, Darren

 

[bengasman]

There should be a drain cock on on a pipe downstairs, usually close to an outside door; stick hose on, tighten jubilee clip, and open.

Turn boiler off at the spur first!

After a year, the system will have corroded, so add a bottle of fernox f3 to clean it, and leave in for 2 weeks.
No need to do anything special with the rads, and don't take them off the wall.

 

[kevplumb]

Q1, How do I drain the water from the boiler and then the rads. The upstairs rads stangely enough have TRV but the down stairs doesn't so I'm assuming it's a full system drain required.

turn boiler OFF
find the drain tap attach hose and open tap when water starts to slow start opening bleed valves on rads upstairs first

Q2, Should I remove the rad's from the wall and wash / flush the insides out.

shouldnt need to but wont do any harm

Q3, I have a bottle of liquid inhibitor. Do I put this in the boiler somewhere or inside the rads. If its the rads am I ok just putting it in the ones down stairs whilst I put the TRV's back on. Should I stick it all in one Rad or divide it amongst them all on the GF?

anywhere you put it it will get round the full system

Q4, Is there any special requirements when refilling the system?

close drain tap close rad vents open fill loop pressure up bleed rads and repeat

make sure the aav is open on the boiler

 

[baxpoti]

Get the service engineer to quote you for the work. I think it'll be money well spent.

ps do not use the aav on top of boiler to add any chemicals

 

[kevplumb]

now thats a better idea

 

[burnsey]

Thanks for the help guys. What is an aav?

Personally I would like to do the work myself, sense of achievement, etc.

 

[kevplumb]

Thanks for the help guys.

its ok just press the button

What is an aav?

auto air vent View media item 11231

 

[burnsey]

The button has been pushed.

Pictures say a thousand words. should this aav be open all of the time or just when I'm refilling?

 

[kevplumb]

all the time