heat upstairs none downstairs

[mikeblo17]

dear board,
I have a 2 zone heating system and one zone is working but the other is not. I have a gas weil mclain and was wondering if i need to bleed and if so how would I do that. I changed the battery in the thermostat to no avail. any help would be useful as i am stymied. mike

[LazyPup]

While there are a number of different methods that can be used to create zones primarily in a residential application a separate main line is run to each zone. We can then either install a separate circulator pump on each zone line or the system may have one circulator pump and separate control valves on each line.

A thermostat is then installed in each zone and the thermostat would either open and close the zone valve or it may control the circulator pump for that zone.

You stated that you have heat in one zone so if your system has a single circultor pump we can assume for the moment that the pump is working okay.

The problem will most likely be confined to the Thermostat, thermostat control cable or the zone valve controling that zone.

[mikeblo17]

thannks for your response
i have been doing a little tinkering. there is only one circulater. pump seems fine. therre are 2 pipes that go out from the furnace and before the man cut off handle there are 2 silver boxes. the one line is barely warm. there is a manual setting underneath the box and i turned it from automatic to manual. this allowed that pipe to get hot. the pipe on the return remained cold. now if i left the backflow (or at least that is what I think it is) in manual and therre were possibly a frozen pipe would it eventually unfreeze the pipe or would the pressure from the water not going anywhere burst the pipe.

[mikeblo17]

quote:Originally posted by LazyPup

While there are a number of different methods that can be used to create zones primarily in a residential application a separate main line is run to each zone. We can then either install a separate circulator pump on each zone line or the system may have one circulator pump and separate control valves on each line.

A thermostat is then installed in each zone and the thermostat would either open and close the zone valve or it may control the circulator pump for that zone.

You stated that you have heat in one zone so if your system has a single circultor pump we can assume for the moment that the pump is working okay.

The problem will most likely be confined to the Thermostat, thermostat control cable or the zone valve controling that zone.

I fooled around with the backflow and put it on manual and the pipe heated up. the pipe on the return did not heat up however. should I just keep the backflow box on manual, open until i figure it out or should I not. i don't know. what do you think.