How to check Taco 007?

joel_19

Could be something like a check valve only partialy opening?? Could be your pump too they usually get noiser if something is going on with the impeller.

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Adam E

I've got a monoflow system using one Taco 007 for three zones (1 zone - the basement - is rarely used) in a moderately sized ranch. The system is 9 years old.

I'm noticing that lately the mains seem to be taking a long time to heat up and the burner is taking up to ten minutes to kick on after a call for heat.

I've bled the radiators (Baseray) and the Taco feels like it's on.

To me it seems as if the Taco isn't pulling water the way it should. Do these pumps lose performance over time (worn impeller?)?

Any suggestions?

Thanks.

Adam E

Thanks Joel, but there are no check valves.

Also, the pump is as quiet as always. I just know something's happening from the vibration.

John Starcher_4

Take temperature readings....

....at various spots in the line downstream from the supply tapping for the zone that is calling for heat.

You should see a quick "heat up" of the line if the circ. is working properly. Sounds like it's time for a new Taco.

Starch

Adam E

Can I swap out the cartridge without draining the system?

Is it a straight forward job?

John Starcher_4

Unfortunately,........

....No. You'll need to drain the system, or close any isolation valves (if they exist) near the circulator. We always try to put valves on either side of the circulator just for this reason. Some of the new combo flange/valve models are sweet for doing this.

Starch

Mark Eatherton1

Try this...

If there is an isolation valve near the pump, with the pump running close the ball valve REAL fast. If there is fluid flowing, you will hear a slight WHooshh as you pinch of the flow. If there is no water flowing you won't hear anything.

ANother trick is to take a torch and hold it against the pipe with the water circulating. Stop the torch, wait 5 seconds and CAREFULLY touch the pipe where you had the torch. If theres water moving, the pipe will be cool. If not, you will know...

ME

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Adam E

Unfortunately, there are no iso valves on the system.

I like the torch idea. I'll give it a shot.

Here's a quick question. How are the electrical connections made when replacing the cartridge on a Taco?

Thanks all.

Wayne M. Lawrence

Taco circulator

There are no electrical connections for the cartridge. It just slips out of the body that has the windings and the wiring. I believe the taco warranty is for 3 years. You may want to just change the circulator complete. You only save about $5.00 just buying the cartridge alone.

Paul_28

cartridge

Do you mean that the cartridge cost is almost the price of a new pump?

Wayne M. Lawrence

Taco cartridge

Yes, the cost of the cartridge is almost as much as the complete circulator. I may have been a little off on the price difference, but we don't stock the cartridges alone on the service van anymore because of how close both are in price.

Dan_16

Did your system heat up quickly when it was new? Seems like a lot of pipe run for that size pump. If you do find the pump bad I'd replace the whole pump. I have to change my tacos almost every 5 years, they don't last long imo. Like someone else said, buy a flange set with built in valves. One brand is "Isolator" by Webstone. Also air can still be a problem, possibly add a spirovent. Expensive but well worth the money.

Joe Mattiello

Taco, 007

If the system was working fine for 9 years, it should work now. You mentioned one zone rarely runs, so the 007 is feeding 2 zones. In a residential application the 007 should have plenty of capacity to satisfy the load. Perhaps the aquastat/relay on the boiler needs replacing. You can replace the cartridge only on a Taco circulator, but that usually fails when the pump is installed on an open system, not that common on a closed system. For your reference I attached the instruction sheet. The replacement cartridge part number is 007-042rp.
Joe Mattiello
Technical Service Technician
joemat@taco-hvac.com
401-942-8000 X 484
www.taco-hvac.com