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1

General Outdoor Furnace Discussion / De-scaling a boiler and piping?

« on: February 08, 2011, 09:27:43 AM »

Hello

Have a Central Boiler thats been running for 2 years with high alkaline (>9ph) water. Recently drained and re-filled with water from the conditioner (6.5ph). After 2 days the PH was back up to 9ph. I suspect there's lime and calcium still in the pipes, etc.

Anybody know of any solution you can put in the boiler to de-scale the thing before I drain and refill again. Its a 450 gallon system.

Thanks
Ron

2

General Outdoor Furnace Discussion / Re: Need help- Circ pumps keep failing

« on: February 04, 2011, 05:53:44 PM »

Thanks for all the suggestions. What I have done is flush out the boiler and replace the water (10ph) with softened water (6ph). Also installed a 1" bypass with a valve half open. Also installed a TACO 2200-200-WB at TACO's suggestion. There was also a 5' piece of 3/4" in the line that was replaced with 1". So far it appears to be working fine. Ran it up to 190 degree and the pump wasnt cavitating. Dropped it back to 180.

Also, one question was how the pumps were failing. All the rotors siezed up and sometimes burnt the windings. I'll keep this forum posted on the progress, as someone may have this problem.

3

General Outdoor Furnace Discussion / Re: Need help- Circ pumps keep failing

« on: January 26, 2011, 06:56:16 AM »

Yes, the pump is mounted vertically pushing down. It was installed by the Central Boiler dealer and from what I read in the TACO docs, it's right.

Thanks
Ron

4

General Outdoor Furnace Discussion / Need help- Circ pumps keep failing

« on: January 25, 2011, 10:41:27 AM »

Hello

I have a Central boiler 6048 model. It was installed last year and since then I have replaced the pump at least 10 times. The parameters are as follows: Boiler is open system that is connected into the existing boiler. Physically, its 100 foot from this connection and consists of 50' of 1 1/4 pex and 50' of 1" copper. The total distance around to the registers is around 250' of 3/4" copper and 3 different zones.  Water temp in the boiler was at 190F and 400 foot above sea level with the pump 3' below water level.  I started out with an 009 pump and it went out in 3 weeks. Tried the 008, same thing. Spoke with Taco and suggested 007 in series feeding 009. The 007 burned up in 5 days. After going thru the calculations, I believe the 009 is running at 9 GPM and requiring more NPSHR than my boiler setup can provide so I turned down the temp to 175F to see if that lowers the NPSHR and fixes the problem. And yes, the voltages were checked out already. Taco suggested going to the 200-20WB series pump.

Any help would be appeciated as I have had several local "experts" look at this with little help.