Sorry about not making all of the facts available. This is an older unit which worked just fine with the factory 15A GFCI cord cap. However, the general purpose 15A circuit the spa was using, would occastionally trip. This is understandable as the unit should pull 14A just by itself with the heater on and the pump motor in low speed. Throw another load on that circuit and trip goes the breaker. Then about three weeks ago, the pump motor was replaced because it apparently failed. I guess the old motor was making buzzing sounds and other encouraging noises. With the new motor, the amp readings are as I have indicated above. 25A measured at the breaker for a micro second, drops down to 11A for a second or two, then jumps up to 21A to 22A.
The following chain of events is just my guess, but here it goes anyway. The 25A burst is the pump motor spinning up. Then it drops down to 11A, which is the normal current draw of the pump motor in high speed. Then the heater kicks on, but the pump motor doesn't drop into low speed. So now, instead of a normal 14A draw, it is now pulling 21A to 22A.
I told the HO that with a schematic, I could have it troubleshot in no time, but alas, we dont' have one. I'm not sure how much time he wants me to spend working on a spa problem that essentially is the responsibilty of the tech who replaced the motor. I believe all the earlier EC did, was take some amp readings and tell the HO the unit needed a 30A circuit, new recep and cord cap. Perhaps the spa can in fact be converted to a higher amp draw. Or perhaps even a 240V circuit. I'm going there tomorrow evening to run the conduit to the panel for a new circuit, so maybe I'll be able to look at the spa.
*edited - I'll have to look closer at the replacement motor and make sure it is capable of two speeds. The original one was. I'm really not sure what to do if the replacement motor is not. I guess I would need to replace the SJ cord with 10-2 w/ ground, AND verify the wiring in the box in the spa is capable of a 30A circuit. Better yet, can these plug in type spas be converted to a 240V circuit?
[This message has been edited by royta (edited 10-07-2004).]
