Boiler taco sentry zone valve

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Old 12-03-19, 08:48 PM
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Boiler taco sentry zone valve

Am having issue with upstairs zone firing boiler, the valve turns and opens but does not turn on boiler. People have pointed me toward end switch and changing head. The valve is 3 years old. This thermostat can drop to well below setting

If another zone like basement is turned on and turns on boiler. The upstairs zone will fully satisfy thermostat even after the downstairs zone has closed. The upstairs zone then continues to turn on boiler and heats.

Wouldnt that be the end switch doing that or does control on boiler take over?

any help is appreciated
 
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Old 12-04-19, 05:33 AM
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Hi, as stated in my previous reply, you must test the end switch terminals on the valve to ensure they are closed when the the Tstat is calling for heat, you could also take a short piece of wire and jump the 2 terminals, the boiler should fire up.
Geo
 
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Old 12-04-19, 10:17 AM
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How do I test the continuity into valve on end switch ?
 
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Old 12-04-19, 11:35 AM
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Or like previously stated just switch the head with another and see if the problem follows the head.
 
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Old 12-04-19, 11:40 AM
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Do you have a multimeter and know how to use it?
Geo
 
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Old 12-04-19, 11:50 AM
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Yes I do have one but am not sure how to check on valve
 
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Old 12-04-19, 11:53 AM
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I see where 2 wires go in on end switch side of valve
 
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Old 12-04-19, 04:04 PM
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Hi, set the meter to AC volts, with the zone calling for heat test between the terminals for the end switch, 0 volts means the switch is closed and the boiler should fire up, 24 volts the valve is bad or there is a bad connection, as I said before use a short piece of wire and jump the terminals out.
Geo
 
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Old 12-04-19, 07:20 PM
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So I am checking this at screw 2 and 3 with zone on. Should show a 0. What will it show if end switch is bad. Thanks for all help
 
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Old 12-04-19, 07:23 PM
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I see above 24 volts if bad.
 
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Old 12-04-19, 07:29 PM
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I see above 24 volts if bad.
 
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Old 12-04-19, 07:55 PM
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On my valve I have 4 wires going in 2 on power head side and 2 on end switch side, there is a black piece on each side that the wires go into. I would need to put multimeter on the 2 going into end switch?

It is odd it seems the zone will run and circulator and bolier if it calls at a time when boiler is still hot but if it gets cold because it has not run it won’t turn on. This morning thermostat was set at 68 and temp was 65. Again valve was open but bolier was sitting there on standby 1 which is it’s ready state

other zone works fine , superstore zone no problem
 
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