Sunnen rod heater problem.
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Sunnen rod heater problem.
We have a sunnen CRH-50 rod heater. It's stopped heating. Inside there is a thermo disc. When activation button on front is pushed in the thermo disc switch has power on one side but not the other. If we bypass the switch and connect the two wires together the coil will heat up. So that makes us think the thermo disc switch is bad. Does that sound right? And any idea where to get a replacement switch? Sunnen says no longer available through them. Part number on switch is 49T11. Anyone have any experience with working on one of these things. We do mostly stock engines so 90% of all pistons we get are press fit. Thanks for any help.
- Dave Koehler
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Re: Sunnen rod heater problem.
Bit of a rip but here is one.
https://www.ebay.com/i/362843732597?chn ... q8QAvD_BwE
Edit: oops I don't think that is what you asked for.
https://www.ebay.com/i/362843732597?chn ... q8QAvD_BwE
Edit: oops I don't think that is what you asked for.
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"Never let a race car know that you are in a hurry."
Re: Sunnen rod heater problem.
Thanks for your reply but no that's not what I'm looking for. Problem is I'm not really sure if what I'm looking for is the problem. When you push the button in that you just posted the coils don't heat up. And sunnen was no help.
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Re: Sunnen rod heater problem.
Check your PM
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Re: Sunnen rod heater problem.
I think this is what you are looking for?:
https://www.radwell.com/en-US/Buy/THERM ... ISC/49T11/
It is listed as discontinued, but it appears to be NOS.
It also appears that there are cross references to the switch. Type in 49T11 Switch on Google. Here's one link:
https://www.lintechcomponents.com/produ ... 9024/81439
I am assuming that the thermo switch is mounted on the heated part of the rod heater. Its function would be to be closed (current flows) when the rod heater is turned on and, once it reaches temperature, it opens up to turn off.
https://www.radwell.com/en-US/Buy/THERM ... ISC/49T11/
It is listed as discontinued, but it appears to be NOS.
It also appears that there are cross references to the switch. Type in 49T11 Switch on Google. Here's one link:
https://www.lintechcomponents.com/produ ... 9024/81439
I am assuming that the thermo switch is mounted on the heated part of the rod heater. Its function would be to be closed (current flows) when the rod heater is turned on and, once it reaches temperature, it opens up to turn off.
Re: Sunnen rod heater problem.
You can also use any similar part as long as the temperature and current rating match. Here's another supplier of similar parts:
https://www.alliedelec.com/product/selc ... lsrc=aw.ds
https://www.alliedelec.com/product/selc ... lsrc=aw.ds
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Re: Sunnen rod heater problem.
Yes thats retail from sunnen. I have tried to buy stuff from them in the past but they believe any NOS prts are worth the same as the manufacture sold them for retail cost.Dave Koehler wrote: ↑Thu Apr 23, 2020 12:52 pm Bit of a rip but here is one.
https://www.ebay.com/i/362843732597?chn ... q8QAvD_BwE
Edit: oops I don't think that is what you asked for.
very hard seller to dicker with if at all
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Re: Sunnen rod heater problem.
z,
I bypassed both of the discs on mine over 20 years ago and have had absolutely no problems. One of them would open intermittently and the other one had never opened so I just did away with both of them. It doesnt get used as much now days but still a couple of times a week.
I bypassed both of the discs on mine over 20 years ago and have had absolutely no problems. One of them would open intermittently and the other one had never opened so I just did away with both of them. It doesnt get used as much now days but still a couple of times a week.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com
Advanced Automotive Machine
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Re: Sunnen rod heater problem.
push the switch/button in and hold it pegged for a few minutes. Does the coil begin to heat up?
Re: Sunnen rod heater problem.
So that won't overheat the coils and damage them?BillK wrote: ↑Thu Apr 23, 2020 6:56 pm z,
I bypassed both of the discs on mine over 20 years ago and have had absolutely no problems. One of them would open intermittently and the other one had never opened so I just did away with both of them. It doesnt get used as much now days but still a couple of times a week.
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Re: Sunnen rod heater problem.
my right coil worked, the left did not.
one day I held the left button pegged for like 5 minutes, the unit clicked (reset?) and it has worked ever since.
one day I held the left button pegged for like 5 minutes, the unit clicked (reset?) and it has worked ever since.
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Re: Sunnen rod heater problem.
Yes thats retail from sunnen. I have tried to buy stuff from them in the past but they believe any NOS prts are worth the same as the manufacture sold them for retail cost.
very hard seller to dicker with if at all
[/quote]
You do know he's a Sunnen rep. right?
Tom
very hard seller to dicker with if at all
[/quote]
You do know he's a Sunnen rep. right?
Tom
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Re: Sunnen rod heater problem.
Like I said, its been that way for 20 years and have not had a problem yet. If I remember correctly I never used to hear or see them do anything anyway. I imagine if you had one of the timers fail and left it on for an extended period of time that it might hurt one of the coils. Hasn't happened here yet. If i remember correctly when the disc failed back then I tried to get a replacement from Sunnen and they were not even available then.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com