Strange furnace fan timer

jrc2905

Hi, I am working on a RUUD oil fired hot air furnace. The unit is going off on limit due to failure of the fan timer not turning on. The fan timer suffered heat distortion and failed, the result of the blower motor not turning on. The brand on the timer is A1 components #47-22896-01. It has three 24volt connections. For the fan motor it has three 120volt terminals, COM, N.O. and N.C. I have not seen this timer before.
I have a new one but no wiring diagram came with it nor is the any on the furnace, the furnace wiring is suspect. Can anyone tell me how the three 24 volt connections are used?
The fan motor will run if I use the common and N.C. and all other components test out on this unit.
I was thinking about using a sequencer for the fan timer instead.
Any information is appreciated.

rucomfy

Model Number

If you have a model number it would help. There are different series. The A series (UOBC-084A) used a line voltage fan switch mounted with the high limit. The B series modified the chamber supports etc and used a 24V delay timer mounted at the blower. This timer is pretty much specific to Rheem/Ruud. If you have model I can look up in SM. Depending where you are, there a some good tech reps in NJ that might help.

Techman

fan delays

Morning!The Ruud/Rheem/ delays that I'm familiar with operate as follows, 1-24v is a constant hot (r),2nd 24v wire is constant common (c)and the 3rd 24vwire is from heat (w)which starts the "on" delay.Does this sound right to you?

jrc2905

Thanks I forgot to list the model number, it is UOUC130RD3A.
The timer has 3 24volt connections, I just got a wiring diagram faxed to me so now I can check it out. thanks