Max wrote:

Thanks for the quick replys. Here's some more info for you.

It's a Burnham furnace, pressure dropped to 0 when we changed the
expansion tank. Current pressure is 20PSI, current temperature is a
hair under 170.

We have 5 zones with Taco Cartridge Circs Model 007-F4

The controls are Argo ARM842 (3 zone) with 2 expansion zone controls,
also Argo of course.

Sounds like the temp might be too high then? What would cause that
and is there a way for me to adjust it without calling in a pro?

Thanks.


170F may be normal; all depends on the heat load
the boiler must supply. You'd have to look if there
is an adjustable temp sensor in the boiler (water).
Leave the temp alone; that's probably a red herring.

Each circulator should prevent self-circulation
in its own loop when not running. That may be a clue.

There is a helpful forum here you might post to:
http://forum.doityourself.com/forumdisplay.php?f=128
Whip up a few photos of the zone pump layout.

Jim