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zoned hot water system problem RayV 11-01-2006
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Posted by RayV on November 1, 2006, 1:58 pm
My BIL has a problem with his system, here's the current setup:
Boiler in basement

Split level house with all zone loops higher than basement

Three zones - all thermostats working properly

Circulator pump on the cold/return side of boiler mounted just above
boiler inlet
comes on with furnace (zone independent)

Flo-control valve on the hot/supply side of boiler mounted near ceiling

Air separater right after main flo-control valve with bladder expansion
tank

Three additional zone circulator pumps connected to the thermostat
relays

Three zone flo-control valves, one right after each zone pump

The problem is that whenever any zone calls for heat there is flow thru
all three zones. I verified that each of the zone pumps are working
independently and correctly. He told me that the system has always
operated this way and he just sets the thermostat on the upper level to
50 so it never kicks on because he always gets heat up there.
There are no zone valves on any of the zones, only the flo-control
valves. The zone pumps, flo-control valves and thermostats appear to
be add-ons to the original system.

I would like to hear ideas on possible repairs or system changes that
would get the system to only heat the zone(s) that is calling for heat.


Posted by dd on November 1, 2006, 5:33 pm

> My BIL has a problem with his system, here's the current setup:
> Boiler in basement
>
> Split level house with all zone loops higher than basement
>
> Three zones - all thermostats working properly
>
> Circulator pump on the cold/return side of boiler mounted just above
> boiler inlet
> comes on with furnace (zone independent)
>
> Flo-control valve on the hot/supply side of boiler mounted near ceiling
>
> Air separater right after main flo-control valve with bladder expansion
> tank
>
> Three additional zone circulator pumps connected to the thermostat
> relays
>
> Three zone flo-control valves, one right after each zone pump
>
> The problem is that whenever any zone calls for heat there is flow thru
> all three zones. I verified that each of the zone pumps are working
Shut off the circulator mounted at the boiler return bet the problem will go
away



Posted by RayV on November 1, 2006, 10:17 pm

dd wrote:
> >
> > The problem is that whenever any zone calls for heat there is flow thru
> > all three zones. I verified that each of the zone pumps are working
> >
> Shut off the circulator mounted at the boiler return bet the problem will go
> away

Doesn't having the pump(s) only on the outlet side of the boiler
increase the chance of a boiler overtemp?

I suppose I could just disconnect it and run each zone for 20 minutes
and see what happens.


Posted by Steve Scott on November 1, 2006, 11:07 pm
Generally speaking, a typical residential system that's properly piped
and is in a standard series loop configuration w/o primary/secondary
piping will only have circs on the supply side after the expansion
tank.

What makes you think not having a return circ would cause excessive
boiler temp?


>
>dd wrote:
>> >
>> > The problem is that whenever any zone calls for heat there is flow thru
>> > all three zones. I verified that each of the zone pumps are working
>> >
>> Shut off the circulator mounted at the boiler return bet the problem will go
>> away
>
>Doesn't having the pump(s) only on the outlet side of the boiler
>increase the chance of a boiler overtemp?
>
>I suppose I could just disconnect it and run each zone for 20 minutes
>and see what happens.


--
My problem is drinking Coke in the
Pepsi generation





Posted by RayV on November 2, 2006, 6:15 am

Steve Scott wrote:
> Generally speaking, a typical residential system that's properly piped
> and is in a standard series loop configuration w/o primary/secondary
> piping will only have circs on the supply side after the expansion
> tank.
>
> What makes you think not having a return circ would cause excessive
> boiler temp?
>
This is the third house I've seen in this area (Eastern PA and NJ) with
a pump on the return side of the boiler. One was a ranch with no
zoning, the other had one pump with three zones with zone valves after
the boiler (worked fine), and this crazy system with four pumps!

Of course most of the houses in this area have the shingles overhanging
the sheathing by 1.5" so they hang in the gutter but that isn't right.


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