TACO ZVC404-4 zone valve control

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Old 09-29-12, 04:47 PM
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TACO ZVC404-4 zone valve control

My new ZVC404-4 isolated end switch doesn't call boiler for heat. Any suggestion will be helpful.

Thank you.
 
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Old 09-29-12, 07:46 PM
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how many zones do you have and how are the other zone valves wired? What happens if you jumper the 2 wires attached to the end switch terminals?
 
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Old 09-30-12, 05:37 AM
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I have 4 zones (Honeywell V8043) and 1 circulation pump Taco 007-F5. Two yellow wire are connected to terminal 1&2 and red to 3&4 on ZVC. When thermostat call for heat zone valve open and circulator start, but boiler doesn't. If I jumper the 2 wires attached to the end switch terminals, boiler starts.
 
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Old 09-30-12, 05:59 AM
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Check the Taco fuses........
 
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Old 09-30-12, 06:01 AM
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Is the valve light lighting up along with the corresponding t-stat light when you call for heat in a zone? Which end switch terminal are the boiler leads connected to? A or B? Do you have an indirect water heater on the system? If so, is it wired on zone 4? Can you post a picture of your controller so I can see the connections?
 
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Old 09-30-12, 09:20 AM
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Yes, the lights are lighting up for every zone when thermostat call for heat. Zone 4 will be for indirect water heater, but it is not connected yet.
I am sorry, I don't know how to post picture, but you can see this controler on page 32 in this guide:
http://www.taco-hvac.com/uploads/FileLibrary/100-92.pdf
 
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Old 09-30-12, 09:32 AM
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Use a photo sharing site such as photobucket and then post the lnk to your picture here in this thread. I know how the controller should wired. I don't know how you have wired it.
 
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Old 09-30-12, 09:42 AM
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I wired the same how it is in the guide for ZVC
 
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Old 09-30-12, 09:53 AM
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If you are certain of that then you have a bad control. I can not help any further unless we verify your wiring.
 
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Old 09-30-12, 10:06 AM
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I checked by ohmmeter isolated end switch, but it never closes when zone valve opens and circulator starts.
 
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Old 09-30-12, 10:11 AM
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Did you do so at each zone valve or only at the controller
 
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Old 09-30-12, 10:20 AM
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I did at control end switch.
After, I connected one zone valve end switch directly to boiler. Boiler starts, but circulator didn't.
 
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Old 09-30-12, 10:33 AM
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I would return and replace the taco Controller
 
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Old 09-30-12, 10:37 AM
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Thank You so much. I will return it.
 
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