Maybe if you purge BEFORE you commission the appliance.......?
I do very beg your pardon
WHAT???0.03ft3
I do very beg your pardon
WHAT???0.03ft3
Now you've got me worried ChrisR. The FFD check is presumably a tightness check upstream, yes? But would that be downstream of the appliance isolating valve? I ought to know this stuff .There are lots of "surprising " candidates, Most don't know how to check that a FFD, on say a grey button gas valve, isn't letting by
Everyone condemns a wooden chimney which has a liner in it
WHat I was told:The FFD check is presumably a tightness check upstream, yes? But would that be downstream of the appliance isolating valve?
With such a small volume of gas under test, even a minuscule leak would show up when it wouldn't when testing a "normal" meter + pipework volume. So the normal 4 mbar in 2 minutes allowance can't apply in such a case, can it? Are you saying than any visible drop over (what?) time would be unacceptable?Gauge shouldn't move but will if there's very small escape.
WHat I was told:
Once the FFD has clunked, attach gauge to GV, inlet side , turn off appliance iso valve. Watching the gauge, call for heat/open main solenoid. Gauge shouldn't move but will if there's very small escape.
New one on me. How many blips in a millibar, anyone? And how many small blips to the blip, for that matter?[if theres a small blip in gauge then ffd is passing, I believe british gas guys called it the blip test.
Weve been trained to check ffd same time as we do burner presssure, turn of iso valve to appliance with gauge connected.......listen for click then open valve back up
Yes......if the fsd fails gas will pass thru to burner which would then show (in a sizeable movement) on the manometer, this is what tutors have taught us this week.....it saves time on the assessment if your taking burner pressure, you can check fsd at the same time, so were told.Do you mean with the manometer attached to the BP test point?
There is a reason for the pilot.......not sure though Maybe ChrisR can explain.
The 3rd option is a tightness test at meter with iso valve open at appliance?
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