intermittent lock out

[DJS55]

Just working on a Riello rdb1 with a tiger loop and i cant maintain oil in the loop.

The oil tank is at least 30 meters away and is possibly lower that the burner.

The system and filter is clean with about a head of 7-8 inches of oil in the tank. New oil lines fitted and all joints checked, yet it wont maintain oil in the loop. I have primed the loop and it will only run for a short period and then empty the tiger loop. i had another riello burner sitting and suspecting the oil pump i did a quick change and again the loop empties.

Previously the tank has run dry so six or 8 inches of head should be sufficient.

Thoughts welcomed

D

 

[smtplumbing]

is there a non return valve at the tank ?

 

[albatross]

Tigerloop FAQ

See question 12.

 

[Best]

Is the bypass screw fitted into the oil pump?
If everything seems okay then the tiger loop might be faulty.
You didn't give enough info. 30m is a fair distance. Was there a tiger loop etc all there before?

 

[Best]

Tigerloop FAQ

See question 12.

Sorry Albatross in repeating what you said, but I read point 12 after I posted. :smile:
Something I always try to remember is the bypass screw.

 

[Dotty]

What size oil line between tank and loop?

 

[DJS55]

The system has been operational for 9 years with the tiger loop etc in situ and yes the bypass screw is in place. With the fitting of a trial burner the lock outs were not as frequent and I wonder was the pump a little stronger which has helped.

The oil level in the tiger loop is barely visible, no were near the float and I have primed it etc. In essence I may try 900 litres of oil to increase the head and wonder if the tiger loop is defective.

 

[DJS55]

Oh thanks to everyone for the input so far!

 

[Best]

Tigerloop is most likely the culprit if you are not seeing air bubbles inside it while burner running. I carry a new Tigerloop often as it can be a fault. Supposed to replace them every 12 years I read. Can't fit the things in any building/boiler house anymore, unless it is the Bio model with a vent connection for vent pipe to outside

 

[DJS55]

As an update the fire valve (teddington) was faulty restricting the oil flow, is essence starving the system of oil and triggering the intermittent lock out.

Tricky but sorted and thanks for the help!