I believe a lightning surge blew transformer on my Pentair Minimax heater. PB did not tighten ground wire in easytouch panel. I could pull the wire out of the grounding block so easy with my little finger. I suspect that caused the "frying" of the transformer. I used an ohm meter and get no voltage out of the orange white wires so I am sure it is gone. The Pentair transformer 471571 is $50-$70 to replace. Made in China and imported by Bestwill. The advantage is that the two plugs are wired in place so it is a simply plug n play replacement. I wanted to save some money so I searched for the exact spec transformer and found a White/Rogers replacement that has the same written specs and has the same weight and measurements and is less than $20 at http://www.grainger.com but one disadvantage. The wiring has different colors and am afraid of just wiring it the same and trying it so I wanted to ask for help here.
I looked at the Pentair install manual wiring diagram but it doesnt give much help. It shows the wire colors coming out of the transformer but doesn't tell you what the specific color connects to (i.e. power, ground, 240, 120). Actually one wire is even out of order on their diagram. The input plug and wires coming off the transformer itself actually has the wires in this order (top down) Black, Black-White, White-Red, Red and the diagram (top down) shows Black-White, Black, White-Red, Red. I'm not sure if that means anything or matters at all.
The new White/Rogers transformer colors (top down) are Orange, Red, White, Black. Even though they come off in a different direction (soldered on the transformer)from the original should they be connected the same order? So, new/old : Orange = Black; Red = Black-White; White = White-Red; Black = Red. ??
On the other side of the transformer are the two 24V out put. Old transformer was (Ground) then White wire, Orange wire. New model (has no extra ground wire so I assume the chasis is the ground) then Blue wire, Yellow wire. So, new/old: Blue=White; Yellow=Orange. ??
The job is just to solder the old plugs in place in the correct order. I do know that the White/Rogers came with a sheet that tells me their colors on the Input mean: COM=Black; 120V=White; 208V=Red; 240V=Orange; GND=Green (there is no green). For the out put COM=Blue; 24VAC=Yellow
Where am I right? Where am I wrong? Input is greatly appreciated and I hope this can be helpful to all of our Pentair heater owners who want to save $$ on replacing transformers. I might be able to post pictures if I can figure it out again.
Edited for font size. JasonLion