I have good news … the Teledyne 4020 can be dual fuel without mechanical or pneumatic modification. This is in stark contrast to the Rosemount 400A that does require a different fuel restrictor and different capillary.
That being said, you’ll have to do some important tasks when changing fuels.
Let’s do this (going from PURE fuel to MIXED fuel):
- Set the fuel to 10 psig and attempt to light the flame. If that doesn’t seem to work, go up to 13 psig.
- Once lit, do a quick test with zero gas and span gas just to see that it responds (we don’t care what it reads, just that it does read)
- Extinguish the flame (as we really don’t know how hot we’ve made it inside the burner; see the “The next steps” below)
Let’s do this (going from MIXED fuel to PURE fuel):
- Set the fuel to 2 psig and attempt to light the flame. If that doesn’t seem to work, go up to 3 psig.
- Once lit, do a quick test with zero gas and span gas just to see that it responds (we don’t care what it reads, just that it does read)
- Extinguish the flame (as we really don’t know how hot we’ve made it inside the burner; see the “next steps”)
The next steps:
- Find a set of needle tip probes for your voltmeter. We have to see where the temperature actually plateaus at once we get lit.
- Find a set of ‘mini-grabber’ clips to test the Preamp Board output signal
- Call RIGAS for the rest of the procedure.