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Old 02-23-2013, 01:33 PM   #1
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Inducer motor problem AGAIN!!!


Inducer motor not creating enough vacuum on a john woods 40 gal powervent hot water heater. Tank is 4 years old, replaced first blower 2 years ago, at that time measured 2" WC with no flue, 0.6" with flue. Pressure switch is rated at 0.15 " WC. Now measuring 0.2 " with no flue, .05 with flue. 13 ' of 2" venting with 3 90 deg. elbows. Have replaced 2 of them with 45's, not much change. Cleaned fins on the motor, still no help Short of replacing yet another inducer motor, any ideas? Next tank is going to be a direct vent!!

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Old 02-23-2013, 02:02 PM   #2
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Inducer motor problem AGAIN!!!


Do you have the installation manual? You might need to upside your exhaust pipe to 3 inch.

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Old 02-23-2013, 06:10 PM   #3
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Inducer motor problem AGAIN!!!


internal blockage inside tank?
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Old 03-03-2013, 11:04 AM   #4
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Inducer motor problem AGAIN!!!


2 " venting is theoretically good for 50', I have an equivalent run of 17'. Plus it was working initially with the same piping. As for internal. GSW is no help, they dont answer emails, Anyone?? Next tank I buy will not be a power vent, and definitely not a John Woods.
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Old 03-03-2013, 11:08 AM   #5
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Inducer motor problem AGAIN!!!


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internal blockage inside tank?
How would a blockage inside the tank have anything to do with the venting. It draws air from baffle, and works again when the fan is changed?
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Old 03-03-2013, 12:04 PM   #6
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Inducer motor problem AGAIN!!!


It could be the baffle inside the tank is carbonned or rusted up and blocking the space the flue gas has to exit. THe inducer/exhaust fan has to suck thru the tank so internal blockage is possible. Also possible they have a bad batch of exhaust fans. I have not removed the top of one of those to see if it has a removable baffle like the old natural draft one has. Also some tanks had a screen underneath them where the combustion air enters and they plug easily with dust/dirt/dog hair. Wherever the air enters the burner is where you want to look and different brands do it differently. May need to take a inspection mirror or mirror and look under the tank for that screen.
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Last edited by yuri; 03-03-2013 at 12:06 PM.
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Old 03-03-2013, 01:23 PM   #7
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Inducer motor problem AGAIN!!!


Maybe your air intake at the bottom of the tank is blocked with sawdust or something?

Power vent water heaters usually have 3 inch PVC pipes in my experience. I think you should change to 3 inch considering how much drop you get when adding your flue.
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Old 03-04-2013, 07:36 PM   #8
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Inducer motor problem AGAIN!!!


Replaced blower motor today, heater works again. Vacuum pressure still seems suspiciously low, 0.2", will take a look at the air intake and baffle when I get a chance and report back.
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Old 03-05-2013, 12:49 PM   #9
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Inducer motor problem AGAIN!!!


Quote:
Originally Posted by jagans View Post
Maybe your air intake at the bottom of the tank is blocked with sawdust or something?

Power vent water heaters usually have 3 inch PVC pipes in my experience. I think you should change to 3 inch considering how much drop you get when adding your flue.

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