Grant 90 Outdoor Oil Burner Drain Cock

[jasps]

Hi,

Is there drain cock on the Grant 90 outdoor oil burner? I can't see one anywhere and I need to drain it so I can replace the pressure gauge which has stopped working.

Thanks in advance,

Adam

 

[oilman]

You don't need to drain it. Use the pressure relief valve to remove the water pressure, cover the burner with a plastic sheet, then put a cloth under the gauge port. Have the new one ready, and get a move on changing them over. You wont lose much water.

 

[cozzmic]

Bottom RHS below and to the right of the burner. You run the risk of getting crud in the seating of the PRV and it not reseating causing a leak of repressurisation.

 

[oilman]

You run the risk of getting crud in the seating of the PRV and it not reseating causing a leak of repressurisation.

The PRV is at the top of the boiler, I have NEVER got crud causing a problem as all the crud sinks to the bottom, where it HAS been a problem getting stuck in a little used drain cock, assuming the washer doesn't disintegrate anyway. The only problem I have had with PRVs is the knob gets stuck, or turns with no useful effect.

This attitude of discouraging opening of the PRV is contrary to the requirement to check its operation to ensure it is not stuck (as it is a safety device), when the consequences can be far more damaging. If you need a reference, see BSS 7074 part 1. (see Grant manual section 5.1)

 

[jasps]

Thanks very much for your reponse.

The pressure relief valve, is that underneath the top cover? It isn't noted on my diagram. How do I open it?

I would much rather get a professional round to do the job, however, the earliest I can get one out is the end of January ???

Adam

 

[gasandoilman]

is the boiler working?
no problem in waiting if it does

if it goes above 3bar it will blow out anyway.

 

[oilman]

It's on the top, and has a red knob, usually with an arrow pointing anti-clockwise. Twist in direction of arrow.

 

[oilman]

if it goes above 3bar it will blow out anyway.

You are making the assumption it's not stuck. Which it might be if nobody's ever checked it.