DIYbanter - View Single Post - Heat wont come on after running out of oil

RBM[_3_]

On 1/17/2012 12:06 PM, wrote:
On Tue, 17 Jan 2012 11:54:50 -0500, Marilyn& Bob
wrote:

On 1/17/2012 6:17 AM, RBM wrote:
On 1/16/2012 10:23 PM, Ed Pawlowski wrote:
On Mon, 16 Jan 2012 15:20:17 -0500, wrote:

if the pumps got ice in them, both couplers could be broke. The
motors will bust those couplers if the pumps cant turn from ice.

Please - Repost that link to the photos.

Friend's house has 6 zones, and only one pump.

Two methods can be used. One pump and zone valves or individual
pumps, one on each zone. The OP has the latter.

or multiple pumps and multiple zone valves

You need valves (even if you have multiple pumps or only one zone) in
a system with a tankless coil, because without the valves, the hot water
would circulate in the heating system by convection when the boiler was
heating water for domestic usage, even if the thermostat was not calling
for heat. So despite the two circulator pumps there must be valve(s) in
this system.
And the question remains - have the zone control vslves been
checked???
I've replaced 4 over the last several years at my friend's place -
lack of heat being the symptom, seized valve the cause.

At least 2 happened when the furnace shut down due to a bad
thermocouple. (twice) Don't know if there is any cause/effect that
could be proven -.

And the same answer remains: There are still no zone valves on the OP's
system. FYI here is a picture of a basic zone valve:

http://www.pexsupply.com/Honeywell-V...tch-10907000-p