Bob Knauff
06-27-2012, 08:59 PM
I don't recall ever seeing an A/C data plate specify only a fuse for over current protection as in the photo of this newer Goodman gas/electric package, roof mount unit. Typically they'll state Max. Fuse or Circuit Breaker sizes or Min. and Max fuse OR circuit breaker sizes.
I tried calling the Goodman factory but couldn't get past the gatekeeper because I am not a "Goodman authorized repair person". I tried calling local Goodman dealers and was told to contact an electrical contractor (as if the Goodman installers do not know this information?!). The electricians I was referred to obviously blew smoke.
Electrical circuit breakers are designed to trip on a different failure curve than fuses and so if the data plate does not specify the use of a breaker then it is my rationale that ONLY a fuse be used in the line. However, this creates a problem in that in order to obtain power from the Service Panel, on this home at least, a breaker must be installed to feed the unit. Then logic dictates that if the breaker were larger than 60A, to be larger than the fuse, a 60A fuse would do just fine in the line.
I am told the guy who rehabbed this house and installed the new A/C is a HVAC contractor. I know what he would have to say!
I would love to be able to talk to an engineer or designer from any A/C mfg., about this type of thing in order to get the low down "from the horses mouth".
Comments? Ideas?
I tried calling the Goodman factory but couldn't get past the gatekeeper because I am not a "Goodman authorized repair person". I tried calling local Goodman dealers and was told to contact an electrical contractor (as if the Goodman installers do not know this information?!). The electricians I was referred to obviously blew smoke.
Electrical circuit breakers are designed to trip on a different failure curve than fuses and so if the data plate does not specify the use of a breaker then it is my rationale that ONLY a fuse be used in the line. However, this creates a problem in that in order to obtain power from the Service Panel, on this home at least, a breaker must be installed to feed the unit. Then logic dictates that if the breaker were larger than 60A, to be larger than the fuse, a 60A fuse would do just fine in the line.
I am told the guy who rehabbed this house and installed the new A/C is a HVAC contractor. I know what he would have to say!
I would love to be able to talk to an engineer or designer from any A/C mfg., about this type of thing in order to get the low down "from the horses mouth".
Comments? Ideas?