On Oct 22, 10:10*am, Phil Again wrote:
On Wed, 22 Oct 2008 05:01:01 -0700, jtpr wrote:
This is a simple system. *FHW on Zone 3. *Pumps out to the garage,
through a Modine blower unit mounted near the ceiling. *It is new this
year. *I turned it on, the zone pump fires up, but the pipes (plastic),
never get warm beyond the first few feet of the return and feed. *There
is a little valve on the feed side with a grey plastic turn screw on the
top, looks like something to bleed with, but I'm not sure how it works.
I backed it all the way out, but it seems to make no difference.

The Modine unit never kicks in, but I assume there is a mechanism to
detect heat in the pipes before it does. *All is pluged in, the zone
pump just keeps running.

Any ideas where to go from here?

-Jim

Jim:

I gather from your post you are using a separate pump for each zone
instead of zone valves and a single pump.

Since your pump and HW line are new, I suggest you also look into the
reverse flow from the other zone(s) in your house. *The pump will pull
from all connection(s) on the HW manifold. *Unless there is back-flow
prevention valve on each zone.

Also, for heat efficiency, you should also have a back-flow on your
garage zone. *You don't want to waste heat in the garage.

Run only your new zone pump for 30 minutes or so, then check the return
pipes from your other zone(s) to see if they are hot, warm, or room
temp. *Trust me, if the return pipes from your other zones are HOT, you
need to make some changes.

However, I do agree with others that your problem is most likely some
sort of blockage, or the the pump motor is not spinning the pump (i.e.
the pump clutch has one or more broken springs.) *- Hide quoted text -

- Show quoted text -

Thank you. I'm not exactly sure what you mean so I'll describe the
setup in more detail. There is a large pipe coming out of the
furnace. There are 3 pipes coming off of this pipe, each one going to
a green pump above it. One pump is for the 1st floor, one for the 2nd
floor, and the third for the garage. Each pump has an electrial
connection to a box on the wall that says something along the lines of
"zone control". Each connection has a corrosponding connection to a
thermostat. Zones 1 & 2 have been operative for over a year and
working fine, the pipes associated with these are hot all the way
through. The pumps are all about a year and a half old, but this is
the first time the Zone 3 (garage) pump was acutally fired up. It
seems to be spinning. When I turn on the thermostat in the garage, I
hear a gurgle of water at the heater, but as I say, nothing get's hot
and the fan never kicks in (Modine unit)

Can you tell me how the valve on the feed end work? They have a grey
plastic knob on the top that I can turn by hand, with a lock nut below
it. If I back the plastic knob all the way up, I can then press it in
and pull it out, but nothing happens.

-Jim