TOP TIP (oilies)

[Bunker]

When swapping out a 996 Mectron oil pump, whip the screws off the solenoid stem plate and store in a nozzle pot - same as blast tube screws

 

[Pipes Plumbing]

Atkinson Tanktops - Worth checking that the lowest threaded joint is sealed properly from the factory (sits inside the tank, just above the hose barb & contains the nrv ball).

I have had 2 recently which were allowing air into the oil lines, causing the boiler to lock out and generally misbehave.
Both had air / vac leaks on this joint. Worth splitting it and putting a bit of oil seal on there.

Annoyingly they would prime nicely with the hand pump and run for an hour on the oil in the lines and tigerloop which makes for a boring cold day waiting to prove the repair.

 

[Bunker]

Electrical testing.
Coils:
BFP coils should read between 1.8 - 2.4 KOhms
3 wire Mectron coils should read 1.4 Ohms across brown/blue and 1.47 Ohms across black/blue
RDB coils should read between 90 - 100 Ohms

Capacitors:
You can test the caps on any meter with the capacitance icon --l (-- BUT make sure there is no live to the wires. This will simply give you the read out in Uf

Transformers:
No ignition? You can test if the transformer is firing by wiring the live onto the motor live. If it fires on start up then its the control box thats faulty. Or more simply, if its an EBI, take the plug out and check for 240v - if you get it but no spark then its the transformer.
EBIs are '33%' which means they must only run for 1 minute in 3 otherwise they will cook. The later EBI4 are much hardier. If you get a really annoying boiler that cooks the EBIs then you can get a 100% unit which can run forever but obviously you are better off finding the cause rather than compromising.
Blown EBIs are usually as a result of a dodgy flame/ photocell/ control box that keeps asking it to come on.

Control Box
The control box gets its 50v power from the motor via the white wire - worth checking if you are having some strange faults.

 

[Bunker]

Put these in your phone:

Danfoss Technical 01932 350655 (very helpful)
Riello Technical 01480 432144 option 5 then 4. Often a voicemail but Graham will call you back quickly, he's great.
Worcester 0844 892 3366 option 2 then 1. Open until 8pm.
Grant 01380 736920. Ask for technical, usually busy - tell her if you are on site and they will call back quicker.

 

[Bunker]

Right, after 6 months worth of servicing and record keeping, here is my list of most common nozzles. This may help you if you are, like me, mostly domestic. From now on I have decided to deplete my range of Ws and just use ES instead.

 

[Dannypipe]

Bunker that's really good of you to put this up. Thanks.

 

[noggin78]

A piece of 5mm flat bar bent at 90 degrees can scrape almost anywhere in the combustion chamber. Drilling a hole in one end for a 8mm bolt makes a great leverage tool for getting out those pesky wb camray baffles.

 

[Duker996]

This really is s top thread :smiley2:

 

[tapsworcester]

I am currently on the Oftec-50 and am grateful for tips like this as to what to take on a job.

 

[Duker996]

Coils.
Danfoss state their operating range is 1.8 - 2.2 KOhms (across the 2 facing terminals).
If you suspect the coil is your intermittent problem, check the resistance when its been running for 10/15 mins - if the resistance is increasing, ie up to 2.5 or 2.6 then bingo its about to give up the ghost.

Maybe a very silly question.......but......do you test this while it's still energised and connected to power?!!

I imagine the figures you posted above (RDB Coil 90 - 100 Ohms) is with the coil disconnected?

 

[quality]

all resistance test is done on an electrically isolated (DE-energised) circuit

 

[Duker996]

So the post I quoted from Bunker where he said to test the coil after it's been running 10-15 minutes, to see if the resistance is climbing, that is also with it de energised?!

 

[quality]

Probably he meant to say test it isolated when its was warm after it has been in use

 

[DaveyHep]

If you try and use your meter on the resistance scale, on a live circuit, the magic blue smoke will escape.

 

[Lou]

I am updating threads. If this is not current then please visit the Oil & Solid Fuel Forum and post a new thread.