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Honeywell pressure switch
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ChrisJ
Member Posts: 15,695
Has anyone noticed a lot of these Honeywell pressure switches failing on Luxaire/York furnaces? Its the one that measures pressure difference between the exaust and intake on direct vent systems.
The switch I'm looking at is a model 9371-DO-HS-0010 and it has failed already in less than a year after replacing the first time. Now, giving it a bump will get it working again for a while until it sticks again (sounds real safe, right?).
The switch I'm looking at is a model 9371-DO-HS-0010 and it has failed already in less than a year after replacing the first time. Now, giving it a bump will get it working again for a while until it sticks again (sounds real safe, right?).
Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
0
Comments
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Is it...
A positive or negative pressure switch? (monitors inducer or HX)
I've found on reoccurring issues the number of elbows or length or vent was right at max.Just a guy running some pipes.0 -
negative
It says -1.00WC on it so I'm assuming thats a negative pressure switch.
I know the exhaust and intake lines are almost identical, one has an extra 45 to offset it some. Also the lines are 1 elbow short of the recommended maximum except the intake has that extra 45 which moves it even closer to the max I guess.
Would modifying the lines and removing any elbows possible give the switch less of a chance of failing?Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment0 -
Yes
I would say not being 1 45* elow from max would surely help. Fieldpiece makes a sweet new pressure switch testing instrument but I don't have one yet because a failed pressure switch is uncommon. It's more likely your altitude or fittings/pipe size being near max. You can increase pipe size if fewer fittings is not possible. Use your analyzer to test negative pressure at the inducer.Just a guy running some pipes.0 -
altitude
Altitude is around 2000 feet.
After looking at it we decided we can eliminate 4 90 deg ells and replace them with 3 45s.
Thanks for your help, I appreciate it.Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment0 -
Update
So my dad said another pressure switch failed a few days ago. He installed another new one and all is well again.
Seems they go around a year before giving a "stuck open' error. Doing a quick search seemed to bring up a lot of pressure switch failures on York / Luxaire units but nothing specific other than a service bulletin saying they changed the switch to deal with contaminants from the silicone hoses.
Still haven't changed the venting arrangement although I think my dad is seriously considering it now. Either that or calling his heating guy out to see if something else isn't right.Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment0
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