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Message |
    
Jgberkeley
Citizen
Username: Jgberkeley
Post Number: 4468
Registered: 5-2001
| | Posted on Sunday, March 5, 2006 - 11:10 am: | 
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Has anyone noticed Honeywell thermocouples not lasting very long.
One house, installed new unit 11/26/05, had to replace it again 3/4/06.
Another house, installed a new unit 12/15/04, had to replace it again 2/2/06.
This season I have replaced 11 other thermocouples that I do not know the original installation date.
Both of the known units were Honewell 300 MV universal replacements, both toast.
Anyone else? |
Master Plvmber
Citizen
Username: Master_plvmber
Post Number: 494
Registered: 3-2003
| | Posted on Sunday, March 5, 2006 - 7:50 pm: |
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I would say those are powerpile milivolt generators and not standard thermocouples you're describing.
Make sure they are not receiving too much of the flame. They can and do burn out.
Master Plvmber |
Dennis J O'Neill
Citizen
Username: Plungy
Post Number: 7
Registered: 6-2005
| | Posted on Sunday, March 5, 2006 - 10:35 pm: |
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Yeah, lots of thermocouples this season and alot of weird low gas pressure problems. We've started to also replace the pilot burner along with the thermocouple on the advice of one of our suppliers and that seems to have eliminated most of the repeat pilot outages. |
Jgberkeley
Citizen
Username: Jgberkeley
Post Number: 4471
Registered: 5-2001
| | Posted on Monday, March 6, 2006 - 4:01 pm: |
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Ok, yes to millivolt generators and not standard thermocouple. To most folks they are just one-and-the-same.
Too much flame. Yes the flame did look a mite strong on this unit. I removed the cap screw on the gas valve and then attempted to adjust the pilot flame, however, full turns in each direction did not (effect or affect) the pilot flame.
Rather than a new gas valve, can I just bend the unit to move the milivolt generator out of the bulk of the flame? |
Master Plvmber
Citizen
Username: Master_plvmber
Post Number: 495
Registered: 3-2003
| | Posted on Monday, March 6, 2006 - 8:13 pm: |
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Yes.
Master Plvmber |
ReallyTrying
Citizen
Username: Reallytrying
Post Number: 707
Registered: 1-2003
| | Posted on Tuesday, March 7, 2006 - 10:42 pm: |
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What the heck is a thermocouple?
There are a lot of potential plays on that word. |
Jgberkeley
Citizen
Username: Jgberkeley
Post Number: 4472
Registered: 5-2001
| | Posted on Wednesday, March 8, 2006 - 8:33 am: |
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I is a metal bulb or tube that sits in the pilot flame of a boiler, hot water heater or even your oven. Any gas device that has a piot light.
It senses the heat of the pilot light and allow the gas valve to open when needed to fire the unit. If it does not sense the flame or is broken, the pilot light gas will go off and the main gas valve can not open.
Two types.
First is the unit that just senses the heat and sends the message to the gas control valve. Rather simple. In boiler systems they work with 24 volt control systems.
The other type generates a small amount of voltage (milivolts) and that energy is used to run the control systems and thermostat.
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