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Old 06-06-2010, 09:35 PM   #16
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Originally Posted by SuperPlumberGuy View Post
Anything west of Worcester may as well be a different country

The check valve can go anywhere in the loop, it does not matter. The water is either moving or its not.
thanks buddy. you've been a big help. (and to the others as well.) feeling a bit more confident about this job, but still have lots of questions.

talk to you later. take care.


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Old 06-07-2010, 02:52 PM   #17
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Originally Posted by schmolze View Post
OK. is the flow check mechanically operated? i guess i'm confused as to why the check valve is called for here as opposed to mechanical zone valves.

if both zones had flow valves and one zone called for water, wouldn't both flow valves open up?s.
The check valve keeps cooler water sitting in one of the idle zones from coming out backwards and entering the zone that is calling for heat. This ensures that the zone calling for heat gets newly heated water from the boiler.

The check valve and the circulator pump inhibit but don't completely stop forward flow (gravity flow) of heated water through a zone not calling for heat.

A mechanical, usually electrically powered, flow valve can be installed to stop all flow through a zone not calling for heat but most folks consider this to be too much of an expense.
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.

Last edited by AllanJ; 06-07-2010 at 02:55 PM.
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Old 06-07-2010, 07:04 PM   #18
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Taco makes a circulator with the flow check built in


Always ask to see your contractors license!
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