"William W. Plummer" wrote in
news
Lp9c.20238$JO3.26084@attbi_s04:
"David" wrote in message
.196...
We have a gas boiler heating system with three zones. 1st zone is for
the downstairs, 2nd zone is for the upstairs and the 3rd zone is for
heating the hot water.
We are currently having problems with the 2nd zone in that it is
keeping the upstairs at 76 degrees. I have recently replaced the
thermostat upstairs and set it at 45 degrees. But the temperature
still remains at 76.
But then for a week or so it seemed like when we turned the
downstairs heat off, the upstairs would turn off also. But yesterday
and today we turned the heat all the way down downstairs and the
upstairs pipes remained hot.
One thing of note, is that prior to replacing the mercury thermostat
with a digital thermostat, I did move the thermostats control up and
down (with the cover off) and did not see any sparks when the merury
made contact with the wires to start the heating process.
Hopefully someone out there can help us out. We don't want to be
frying in the middle of summer and having the ac compete with the
heater.
Heat rises. Any heat from the first floor winds up on the 2nd
floor. The 2nd floor thermostat will always be satisfied and the 1st
floor will alway be calling for heat.
Test the theory by nailing (?) a blanket across the top of the stairs
to cut off the air flow. Or use a candle to find the drafts. There
will be cold air flowing down along the stairs to replace the hot air
going up along the ceiling.
Thanks for responding,
I understand what you are saying. But the upstairs thermostat is not
satisfied and that is why I replaced it. It is not just hot air going
upstairs, the baseboard heat is still on up there, even if the pipes
downstairs are cold.
The heat downstairs is turned off and the heat upstairs is turned off.
All thermostats are at lowest. If we wait more then a few hours, the
pipes are still hot and giving off heat upstairs. The temperature
downstairs will be at 65 and the temperature upstairs will be at 76.
The heat is turned off and the baseboard heater is still chugging
along...