potterton suprima

[jolyndhur]

I'm a recently qualified domestic acs engineer (started as a plumber, still quite young and lacking tonnes of experience) and work for a company in london servicing boilers etc.
just finished a private job on a potterton suprima 30 wall hung boiler. the job was to change the pcb. its a Y-plan set up.
I started by following the potterton literature and firstly removed the 2 purple wires for the fan motor then the two yellows for the thermister then the two white wires for the high limit stat. everything went ok except for two things:
1. the thermister was very loose fitting back on to its socket on the flow pipe (almost as if it were hanging in) which is a bit of a concern. should that not be a nice tight secure fit?
2. the melox (or velox- can't remember the name) connector block for the gas valve came without a bridge for either side of the earth. had to take it from the old pcb, which eventually helped the igniton electrode to light the gas. I take it this lead is essential for what I'm assuming, is a flame rectification device?


any responses would be welcome. its quite daunting at times when you're a bit new in this game and you have a customer askinglots of questions while you're a bit stumped with a boiler problem

 

[baxpoti]

Private work?
Take it you've got Corgi reg in your own name and public liability etc.

Thermistor are sometimes loose fitting, applying liberal amounts of heatsink compound will overcome this.
The earth on the gas valve lead is not req'd on the modified board, the new bolt in the top of the boiler is req'd for earthing purposes.

 

[jolyndhur]

yes I work under my boss' public liability and registration.
never used heat sink before though, is it an adhesive for high temperatures or something else? I just thought that there would be a solid fitting or something more secure to hold the thermistor in its place on the flow.
all my training and apprenticeship has been mostly plumbing and heating installation so I may come across as a bit green when it comes to parts.
do you post on here regularly? I've never used the internet for this but if everyone is as helpful as yourself then I may use it a bit more often.
cheers

 

[corgiman]

yes I work under my boss' public liability and registration.
never used heat sink before though, is it an adhesive for high temperatures or something else? I just thought that there would be a solid fitting or something more secure to hold the thermistor in its place on the flow.
all my training and apprenticeship has been mostly plumbing and heating installation so I may come across as a bit green when it comes to parts.
do you post on here regularly? I've never used the internet for this but if everyone is as helpful as yourself then I may use it a bit more often.
cheers

Heat sink is not an adhesive but allows the transferance of heat more effectivly

Nice boss you lets you use the insurance and registration he paid for on your privates???

You had better makes sure he knows because in the event of summink bad happening and he says "I know nothing of this" then you are for the high jump in a big big way lad.

 

[jolyndhur]

I call it private but its his job under his name, I call it that because I know the customer myself.
also if I wanted to hold my own corgi registration and work under my own name soon, what is the current procedure, because no matter who I ask they never seem to know. I've been told you organise an appointment with one of their people and they vet you whilst looking over one of your installations. is this true? If so how would I go about this if most of my current work is servicing?

 

[gasandoilman]

My acs renewal is due in sept im glad they pass so easily i was thinking of brushing up on my vents and gas chain
guess i dont need too

 

[ChrisR]

If you're working with gas see the "Combustion Chamber" part of this forum. The only free forum on the web for registered installers, it is.
You have to email [email protected] with your corgi number , or in your case your explanation (and hope he accepts it ) and wait a while until he gets round to giving you access , it seems from the comments.
No-one in there will mind you asking numpty questions, because there's no fear of diy madmen "having a go" after reading the answers.

 

[jolyndhur]

don't understand? thanks for your completely unhelpful point gasandoil. you mug