Switching From Stack Sensor to Timer

starsfan01 · Post by **starsfan01** » Sat. Apr. 11, 2015 4:33 pm

I have an older model Keystoker 90 stove. The White Rodgers stack control went again, so I decided to be proactive and switch to a timer for the hold fire. I thought I knew how to wire it up, but apparently I don't. Any help that anyone may have would be greatly appreciated.

The stoker has a Honeywell RA89A relay on it. I had the two leads from the t-stat on T-T and the two leads from the stack sensor on T-T as well. I picked up a C8835 timer. Initially, I ran a jumper from lead 4 on the relay to the clock terminal on the timer. I also ran a jumper from lead 2 on the relay to the plain white wire. I then ran a jumper from T-T on the relay to NO and Com on the timer. The clock motor ran and kicked on the stoker motor when I manually rotated the dial and tripped the timer. I would run the 1.5 minutes and when it clicked off, the clock motor shut off.

Can anyone share the correct wiring pattern?

Thanks in advance!

davidmcbeth3 · Post by **davidmcbeth3** » Sun. Apr. 12, 2015 4:45 pm

Beats me but pics might help ... hopefully you can get this straightened out .

WNY · Post by **WNY** » Sun. Apr. 12, 2015 5:39 pm

You need a constant power feed to the clock motor/timer.I thought it 110v.
the one relay will just kick on the stoker motor for the set period of pins. typically 3-4 pins every 10 mins. 1 pin is approx. 15 sec.

WIring diagram on the Keytsoker site in the manual.

http://www.keystoker.com/manuals/2012/90K-105K-St ... mostat.pdf

starsfan01 · Post by **starsfan01** » Mon. Apr. 13, 2015 10:28 pm

Thanks WNY! The wiring diagram definitely helps. I wasn't expecting to see neutral from the relay go to the clock terminal on the timer and then sending line to switch common. I was thinking that since the stack sensor was normally working NO and common that would be the way to go.

I will give it a try with the wiring diagram from Keystoker.

Thanks again!