Aquastat Protecto relay will not trip. No heat!


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Old 02-11-07, 06:01 AM
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Unhappy Aquastat Protecto relay will not trip. No heat!

I have an old Peerless oil fired furnace. The system is hot water. It has a Honeywell Type R8182D Aquastat Proteto relay.

The limits are set at 180 and 160 with a 15 diff.

Here is what is happening.

When water reaches 180 the circulator comes on. When the water cools to 160 the furnace does not fire.

If I physically tap the protecto relay box, push the rest, or tap on the top silver relay it will trip and the furnace comes on.

Is there a way to reset the relay so that it will trip on its own? I'm running up and down the stair today.

Renirichory
 
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Old 02-11-07, 08:04 AM
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Replace the control.
 
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Old 02-11-07, 09:00 AM
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Talking

Is the control one part of the R8182d or do you mean the whole thing?
thanks
Renrichory
 
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Old 02-11-07, 09:21 AM
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You need to replace the whole 8182 ... they aren't (well, they shouldn't) be repaired. If it's intermittent, just replace the whole thing.
 
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Old 02-11-07, 09:35 AM
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Lightbulb

Thanks,
Just one last question. I found the install instructions online. By replacement does it mean shutting and draining the system ...inserting a new sensing bulb in the imersion well and applying heat conducting compound?

I may not be that savy...having never done that before.

I have installed a new circulator and flow control valve with success and feel confident with wiring.

But... If I can just remove the controller on the front and connect it to the existing sensing bulb that would be great! I assume that I would not have to cool and drain the system?

Thanks again,
Renrichory
 
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Old 02-11-07, 10:10 AM
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Control

The immersion well remains on the boiler, there is NO NEED to drain the system. The sensor bulb is inserted into the well using a heat conductive compound. The sensor must be inserted properly for the control to work.
 
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Old 02-11-07, 10:35 AM
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Right... it's really not that difficult, BUT if you feel ANY apprehension about doing the job it certainly is better to call in a tech. ESPECIALLY since this is a heating system and it is the middle of February.
 
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Old 02-11-07, 10:43 AM
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Exclamation safety limit

Originally Posted by NJ Trooper
Right... it's really not that difficult, BUT if you feel ANY apprehension about doing the job it certainly is better to call in a tech. ESPECIALLY since this is a heating system and it is the middle of February.
As an added caveat, this is a MAJOR safety control. High end temperature limit, burner control, etc. It is vital to ensure that all of the limits and sensors are working properly: high limit, cad cell detection, etc. You could conceivable end up with a run away boiler or a combustion chamber full of oil if the new control is defective or not installed correctly.
 
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Old 02-11-07, 07:01 PM
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The mechanical relays that Honeywell uses in these controls are notorious for failing. Repair is not an option since repair voids the original UL listing.

I prefer a separate aquastat and flame safegaurd control.
 
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Old 02-12-07, 06:25 PM
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Agreed

Originally Posted by furd
The mechanical relays that Honeywell uses in these controls are notorious for failing. Repair is not an option since repair voids the original UL listing.

I prefer a separate aquastat and flame safegaurd control.
It would not cost much more, if any, to install separate aquastat & flame safety controls. Another added benefit is replacement cost should one component fail. A good combination, without getting elaborate, would be an L7224 aquastat & an R7184A primary control.
 
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Old 02-16-07, 05:03 AM
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Smile

thanks! maybe that is the way i will go.
Will have repair made today! yay! Heat!
Renrichory
 
 

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