spray booth burner low burner pressure

[leiadad]

Hi, i have been called to an unusual job for our company and was looking for some guidance. The spray booth is being heated by a gas burner fed from L.P.G cylinders. The burner will come on at high heat for a few seconds and then drop to a low burner pressure. I have spoke to the customer who tells me this is not normal and should come on at high flame until temp is reached and then regulate down. I have tried linking out the stat to which the burner will then be a continuous full burner, because it done this I assumed that this temp stat was faulty and ordered a replacement. I have since been back and this replacement is doing the same thing as the original. Any help would be appreciated.

 

[ShaunCorbs]

Commercial mate

You got yours ?

 

[leiadad]

yes shaun got it about 3 or 4 months ago

 

[leiadad]

do u have experience on these shaun?

 

[ShaunCorbs]

A bit

Normally have a stat inside the paint booth etc you tested that ?

 

[leiadad]

yes it is that which i have linked out to which the full burner will come on.

 

[ShaunCorbs]

Have you checked the internal stat ?

 

[leiadad]

 

[leiadad]

 

[leiadad]

sorry, first time I have posted pics. Know they are not great

 

[jtsplumbing]

On LPG bottles have you checked the regulator on the bottles ?

 

[leiadad]

I have checked the stat which is checking the internal temperature of the spray/bake booth. It is located within a ceiling type void.

 

[leiadad]

Yes regulator is fine, the burner will go at full rate with the stat linked out.

 

[ShaunCorbs]

Does it stay on high burn when you bypass the spray booth stat ?

Looks like it could do with a decent service

 

[leiadad]

yes it will stay on high flame when bypassed

 

[leiadad]

what is the reason for the double solenoid

 

[ShaunCorbs]

what is the reason for the double solenoid

high and low flame

 

[bacon_sandwich]

Couple of question:
Is it just a 2 setting flame or continously variable between high and low?
You say linking the stat keeps it on high flame, what type of stat is it ? - just contacts or electronic.
Trying to figure out whether you have a PID controller or not