Taco 007 with IFC hangs up

Weezbo

are not what i use to purge a system...especiall in the modern dayand age with the use of plastic spring checks and what not...why not purge the system first then let the spirovent do its thing....Oh...now i remember...plastic impellers also no likey air! Be not mistaken ...putting them on roll in a choppy environment is detrimental to thier healt :) ...Troll on and prosper

psd_3

Stuck circulators

I have a 4 zone system, 3 heating loops and 1 DHW. Each of the loops has a Taco 007 IFC on the supply side on a common manifold. There is a Spirovent and pressure tank ahead of the circulators on the supply side. The first circulator following the Spirovent is not frequently used, perhaps a few times a week if that. I have found this zone calling for heat with the circulator humming but no output flow. A couple of on/offs on the thermostat seems to knock it loose. This is the 2nd circulator in this position that has done this and they were both new this year.

My guess - air in the system that isn't handled by the Spirovent on the first pass, will tend to migrate towards this circulator. If this circulator accumulates air in front of the flow check, or around the impeller, it sticks. But then why does cycling the T-stat knock it loose? Also, what is the best remedy for this? Would a TACO 007 without IFC and then a separate flow check on the return side help keep air out of this circulator?

Another question - how quickly does a Spirovent purge air from the system? I seldom hear or see any evidence that the Spirovent is actually working even though I can hear some air in this infrequently used loop.

psd_3

The system was purged initially. It is not always possible to eliminate all the air that way, even when using fast fill. The purge was done in the off season and then these zones lay idle. The zone in question may only run on the coldest days of the year and has probably been accumulating residual air since the heating system started. I don't like thinking that this zone can stick if not used a lot, and would like to find a way of preventing that.

Weezbo

taco makes an exerciser....

lots of different types....are made by various manufacturers basically you could ...or a timer just to cycle the zone ...my friends and i havent experienced the problem you are having so in a way its hard to think of what may be happening is it the first take off on the header?if its seldom used maybe a small line from one supply side to theother supply side of the other pump would keep the air entrained...i really dont picture this in my mind well....

Joe Mattiello

Taco IFC circulators

Taco’s circulators with the integral flow checks offer a wide range of features, including better performance, and cost savings for the professional contractor. Feed back from the HVAC trade industry has been very positive, and indications are that the industry will trend toward the use of IFC circulators. Installation on the supply side pumping away from the expansion tank insures optimum performance ensuring a positive pressure throughout the system avoiding a negative pressure, creating a vacuum at the highest point of the system. When the circulator is installed on the supply side air should naturally be purged from the casing during the system fill. This is true with non IFC pumps and an external type flow check as well, so installing an external check on the return side will not help purge the air out of the system. Apparently you have an air pocket floating around the system, and may have settled at the first pump on the manifold. I suggest repurging that zone and every zone individually to ensure a successful elimination of the problematic entrained air.

Taco, Inc.
Joe Mattiello
Technical Service Technician
joemat@taco-hvac.com
401-942-8000 X 484
www.taco-hvac.com