Hi,
Sorry if this discussion is showing twice. I posted this question, then after posting the table I created did not show up properly, so I edited it and saved, but then the discussion disappeared. If the previous one shows up, I'll delete/close it to avoid duplicating of it.
I tried searching the forums, and searched google for answers, but didn't find an clear explanation of the following:
I have hot gas/water baseboards for heating, 2 zones, and Taco valves.
Heating for zone 1 does not work properly. Seems that during the day it's not heating at all and zone1 temp is around 63F even if I set the thermostat to 69 or 70.
At night the temp in zone 1 is about 68. outside it's actually colder (24F) so I don't know what's going on.
Trying to troubleshoot this to see if my zone1 valve is defective, or maybe the transformer or the wires.
I tested with voltage meter and these are the readings:
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Thermostat ON Thermostat OFF
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Screws 1&2 2&3 1&2 2&3
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Zone1 21.4V* 25V 0 25.1V
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Zone2 24.4V 0 0 25V
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Transformer:
Zone1Only 22.5V 24.5V
Zone2Only 22.5V-24.5V 24.5V
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Valve
When Zone2 Thermostat is ON then Zone2 manual Valve opens all the way if I pull it.
When Zone1 Thermostat is ON then Zone1 manual Valve goes up just a quarter of the way if I pull it.
*Another time I tested Zone1 with Thermostat ON Voltage was 19.4V-21.1V
Note: When Zone2 Thermostat ON then Zone1 2&3 showing 0 volt. Tested this twice.
Thermostat for Zone1- tested wall wires = 24.5V. Tested Thermostat itself for continuity when ON = YES, when OFF = NO continuity.
Can anyone please help shed light on what is going on?
I got a new Taco zone valve from the store, but I want to understand all this before attempting to install it to see if it resolves the problem.
I can attach pictures of the transformer and the valves, but I believe this is enough info.
Thanks,
Shachar
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