Problems With Will-Burt 34170 Timer

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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Stove/Furnace Make: EFM
Stove/Furnace Model: DF520

Post Wed. Jan. 02, 2008 10:14 am

Has anyone had or familiar with problems concerning this will-burt timer, specifically the relay? My DF520 stoker was installed exactly 2 yrs ago. This past fall I noticed the relay chattering and not shutting down the stoker cleanly at the end of the timer cycle. My EFM dealer replaced the relay under warranty and things were fine for about 3 weeks and the new relay began doing the same thing. The stoker shuts down fine when being controlled by the thermostat the only problem is when it is being cycled by the timer.

Could this be a bad run of relays or should I be looking somewhere else (transformer, aquastat, etc) for a problem that may be effecting the relay?

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WNY
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Post Wed. Jan. 02, 2008 12:18 pm

Could be the signal to the relay, it may not drop off enough to release the contacts or bad connections somewhere.

Check all connections, grounds, etc....I think I have seen them put some type of capactiro and/or diodes? across the relay output terminals to prevent the chatter.? It's been a while since I dabble in electronics.
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Hyfire I & Keystoker 90K heating an 1890 Victorian
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Post Wed. Jan. 02, 2008 2:49 pm

It's very rare that we send out a replacement relay. I would check for a loose neutral connection, not enough voltage to the relay and most importantly, and likely, an improperly matched heat anticipator setting on your thermostat.

To check this, you remove the thermostat from its base and you'll see the two screws that the tstat wire is hooked to. (Assuming you have a T87F tstat)

Put the probes of a miliamp meter tester on the screws, which will pull in the relay in the timer. (Assuming you have steam heat) The heat anticipator is set to whatever the reading says.

As a caution, some will measure this current at TT in an aquastat for a hot water system without removing one of the wires from T. This will probably burn out the heat anticipator.
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Post Thu. Jan. 03, 2008 5:46 pm

Thanks guys. I checked all the connections and everything was secure. Stokerman, I put an ameter across the tstat terminal and got a reading of 12mA (the relay closed). Does this reading sound right?

I had a digital thermostat on with no anticpator adjustment. I do have a couple T87F's lying around and will install one tonight or tomorrow. Question on the anticipator setting, is the scale on the tstat in A's and should my setting be 0.12?

My system is one pipe steam.

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Post Thu. Jan. 03, 2008 9:16 pm

12mA is .012. Did you let it run for 1 minute?
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Post Fri. Jan. 04, 2008 11:07 am

It ran for 1 minute last night and rechecked it this AM with the same result. Does 12mA sound low? I'm beginning to question the accuracy of my meter. I plan to check it again today with another meter.

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Post Fri. Jan. 04, 2008 10:35 pm

My aquastat says "set anticipator to .02" printed right on it so that sounds about right. I would check to see if there is a burr on the timer wheel holding the switch partially open, it is an incredibly simple device really.
Burning coal is definitely worth the extra work involved.
"Good enough" is not good enough.

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stoker-man
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Post Sat. Jan. 05, 2008 5:49 pm

The common T87F tstat heat anticipator scale starts at 100 mA (.1) and goes up to 1.2A.

I believe Taco zone valves call for .7 and many applications call for .2, but the only way to know is with the amp meter.
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Post Mon. Jan. 07, 2008 11:27 am

The chattering seems to have stopped. I swapped out the digital tstat for a T87F. I got a 155mA reading across the terminals using a new meter, set the anticipator for 0.2 and the timer has been running well for 2 days. Thanks for all your help. This was the first time I stumbled across this forum. I plan to visit regularly. Keep up the great work.

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stoker-man
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Joined: Mon. Nov. 19, 2007 9:33 pm
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Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove
Location: Lehigh Valley, PA

Post Mon. Jan. 07, 2008 12:07 pm

efm has an area within this forum if you scroll down farther. If you have any efm questions, please visit there or call us. I don't always see all the posts in the Boiler section.
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