Is is time to replace circulator pump on hot water boiler?

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Old 03-15-14, 01:17 PM
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Is is time to replace circulator pump on hot water boiler?

Greetings

About 2 weeks ago the pump started buzzing on my hot water heat boiler. At first it was sporadic but now its pretty constant every time the pump goes on.
The best I can describe its like that 60 Hz electrical hum you hear when a fluorescent ballast goes bad. (Its more irritating then loud)

Besides the humming the system is working normally. Water is definitely getting circulated.
There has been no difference in heat output.

Its a taco 007 so I'm thinking just replace the pump. Motor is going bad. But then I started reading through previous posts about other possible causes

1. Air in system - System was purged in January and like I said all radiators are heating normally.

2. Low Pressure - Well the boiler gauge says zero so I put together my own gauge based on the "measuring pressure" post.
My "custom" gauge is showing 10 PSI with boiler cool.

So its 2 pounds off the "standard" 12 PSI mentioned in other posts.
But this gauge cost me 12 bucks. Maybe its only accurate to +/- 2 pounds?

Should I just replace the pump. Or is there maybe something else is wrong in the system.

Any advice would be greatly appreciated!

Thanks
Matt
 
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Old 03-15-14, 01:56 PM
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Screwdriver to the ear, place the tip on the motor. If what you hear sounds bad, replace the pump.
 
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Old 03-15-14, 02:05 PM
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U tube shows how to replace cartridge, may save you some money .
 
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Old 03-16-14, 01:33 AM
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But this gauge cost me 12 bucks. Maybe its only accurate to +/- 2 pounds?
Most gauges are accurate to +/- 2% of the full scale reading when manufactured. Rough handling in transit can utterly destroy a gauge. If your new gauge is a 0-60 psi model then the reading of ten psi could in reality be 8.8 to 11.2 psi. I would adjust the pressure in the expansion tank and re-adjust the pressure reducing valve to a minimum of 12-13 psi showing on the new gauge. Remember that the pressure in the system MUST be at zero in order to accurately measure the pressure in the expansion tank.

Is the motor on your circulating pump in a horizontal plane as recommended by Taco? Motors in the vertical plane will cause the bearings to wear excessively.
 
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Old 03-16-14, 12:39 PM
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Thanks for the reply.


If your new gauge is a 0-60 psi model then the reading of ten psi could in reality be 8.8 to 11.2 psi.
The gauge is 0-60. So it would seem that the pressure really is under 12.
So its possible the buzzing pump is due to low pressure.

I would adjust the pressure in the expansion tank
I think I'm pretty clear on this. With system pressure at zero adjust tank to 12 PSI

re-adjust the pressure reducing valve to a minimum of 12-13 psi
Are you saying that the valve might be set to under 12 PSI?
Hmm. Not sure I know how to adjust the pressure on these valves.

Is the motor on your circulating pump in a horizontal plane as recommended by Taco?
Even though the pump is installed vertically (return line pipe is vertical) the motor cylinder is horizontal to floor.
 
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Old 03-16-14, 02:09 PM
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Matt,
Your expansion tank is set @ 12 psi, that's fine for now. Add water to your system to between 15-18 psi according to your gauge and see if noise goes away. Even if your gauge is off s little this will still give you enough to quiet the noise if that's the problem.
On you fill valve, bell shaped valve on the cold water supply. It may have a lever or a screw or something to adjust pressure manually. If it's lever just lift and you'll hear after go in if it's working, until you get to 18 psi and see what happens.
If there is air in the system and you have low pressure the pump may be cavating. Higher pressure will help solve the problem.
 
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