not really. the OEM board was itself a fire hazard. i simply took motor drive off of the tiny 10A relay and now the motor coils (one for now) run via the SSR. the onboard relays were switching 120Vac, now they switch low Vdc (~33Vdc). the OEM was not meant to handle 1HP motor, so i am told by Source-1 support guy. Source-1 guy tells me "
i dont know why its just a 10A relay, it wasnt designed for a 1HP motor, i dont have the schematic, you should just replace the board".
mod schematic looks like this, from R1 and R2 to the right are new parts. S1 and S2 are switches inside a onboard dip IC.
You did modify an already listed product.
Now just because that product is listed doesn't mean you didn't get one where they made a mistake at assembling.
Maybe they put the wrong board in it? Listed means they send certain specimen items for testing and listing to cover the entire product line, not that every item produced is examined for listing purposes. Mistakes happen and that is part of why there are recalls on products. QC is for finding such mistakes before products leave the manufacturer, but there is still things that can get by QC.
I do understand if this were your own equipment that you may make your own modifications. If you were doing this for someone else - you possibly could still modify it, but keep in mind you now have put your own warranty on it and have voided any manufacturer warranty if it is still relatively new, so you have to ask yourself just how much you are willing to stand behind should something fail? Not saying you shouldn't modify the item, just that you need to think about what liability you may be presenting yourself with before deciding to do so. A talk with customer about some of the problems encountered doesn't hurt either and remind them that you think there is a problem with the design, but if it is still under warranty that design issue should be dealt with through the manufacturer or else they are going to void the warranty.
If it is cold, a holiday weekend, and they want heat ASAP regardless of what it takes - that factors into decisions as well, but can still have later consequences if you try to resolve problem with the manufacturer.
A heavier duty fan control may not be a bad modification to make, but should you modify a high limit switch - now you have made a change that can effect other items you didn't touch. By allowing the heat exchanger to reach a higher operating temp - you may have earlier failure of the heat exchanger - should the manufacturer find out the high limit was tampered with they can reject the idea of replacing it under warranty.