York 5ton split system questions. Unit is a split system york HP with 3 banks of electic heat.
Startup of a York split system. First off Plenum is a entire mess! ESP is through the roof, and duct work is only good for 1500 CFM's when it gets there.
Symptoms: Unit runs great on 1st stage of heat. 1 bank of electric heat, and HP running. Second stage heat call all banks of heat come on, and blower ramps up to 100% it runs for a minute and then shuts down. Then ramps back up for 2 minutes, and shuts back down. Its obvious that the blower is protecting it self. I put a amp probe on the blower, and everytime the ECM motor hits 6amps it shuts itself down, and then starts over.
I cut a whole in the side of the plenum and installed a 14x6 register, and i got same results. It is a given the Ductwork needs fixed. I am wondering if the motor is damaged because i reduced static, and i get same results. Only on high stage 2000 cfm call does it do this. Any help would be appreciated...