Bjd said:
Run a test on the safety system, high limit, spill switch, rollout, and pressure switch.
One or more of these could result in this type of problem.
bjd
Hi bjd,
Thanks for the response. It seems the pressure switch has given me problems before. I remember on a 5 ton package commercial unit the code on the board pointed in that direction, however the switch itself was OK, but the plenum area where the hose goes from switch was exceesively dirty.
On this unit the flame sensor is itegral to the igniter, Rollout switches I think would not have been activated as the burner continues to be fed gas sup to a certain point. High limit switch mounted on plenum is a possibility
It's doing this cycling thing-which is a little confusing to me. We only been doing A/C work for a little over ayear-we are electrical contractors w/ a new HVAC license.
Where can you firnd a sequence of op for this obsolute unit?
I will go there today and do some more troubleshooting w/a couple of your suggesstions.
Thanks
ded