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My base-board hot water heat system has 3 Taco zone valves in it. One of the valves seems to be not shutting off completly when the thermostat shuts it off, and allows the zone to heat when the furnace is calling for it to heat the hot water tank (for house hot water) My question is the problem most likely in the power head of the zone valve or will I need to change the whole valve?----Thanke you--------------- Lacy Smith

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No you can replace just the head no need to drain the system. Push the head in with a slight twist and it will pop off. At this point check to see if the problem has gone away. If it has replace the head, if you still have the same problem drain the system and replace the valve

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I will work on the sys.further as I try to locate and replace the bad zone valve--------------------------thank you-----------Lacy Smith

Posted on Aug 20, 2008

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How do I connect a 24v damper motor with 6 colored wires red white yellow green blue black to NO COM NC terminals.


Choose two colors of the thermostat wire, and connect them to the NO and COM and connect them to the zone control board leads for the zone intended. Almost all zone valves spring return open when deenergized. So ensure the zone valve is open with the system is off. At the base of zone valve there is a set screw that needs to engage the damper valve shaft in the open position with the motor in the spring release position. Most zone valve are 90 degree moment from full open to full shut. If you have a Carrier zone valve, they go full open to full shut in 45 degrees of motion. Your open stop need to be set so the valve stops in the full stop position.
To help understand the operation of a zone system, say you have 2 zone system and zone 1 thermostat initiates a heat or cool demand. Zone 2 valves energizes and shuts and zone 1 stays open and allow air to heat/ cool zone 1. If zone 2 thermostat simultaniously initiates the same heat/cool demand, the zone 2 valve opens and both zone heat/cool. When either thermostat is satisfied the opposite zone valve closes and when both thermostat are satisfied both zone valves open.
Hope this helps you understand zone operation. The same works for higher multizone systems.

Jul 27, 2014 | Honeywell Motorized Small Rectangular Hvac...

2 Answers

3 year old hot water heater no longer providing hot water at the hottest level.


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Mar 15, 2011 | Air Conditioners

1 Answer

My heat rises higher than the designated temperature. For example, if I set the thermostat to 60 the temperature will go up to 73. Invensys 9405


there could be a few things causing this, the first would be a bad thermostat. The second would be an improper setting of a heat anticipator on the thermostat, the third could be a stuck zone valve that is allowing heat to go in the zone as another zone is calling. Or it could be a stuck flow check also allowing hot water to flow through the zone much like a stuck zone valve.

If your thermostat is an older one with Mercury in it, replace it with a new one and dispose of properly. If the thermostat is newer, remove the cover or consult the owners manual to see if there is an adjustment that shuts off the thermostat a bit sooner to compensate for the heat that will be released from the system so you do not overshoot your setting on the thermostat. There may be either DIP switches to adjust the setting or a small pointer that slides over a small coil of wire and acts like a dimmer switch. Try adjusting and testing the system to see if it helps. Remember the original settings in case it does not help.

If you have zone valves (small boxes that allow flow of water to the zone) it may be stuck open allowing water to flow into that zone as another zone calls. You can test this by feeling the pipes at a baseboard when you know that the zone over heating is not calling for heat (turn thermostat to lowest setting). Check other zones to see if there is a call for heat in one of them. Make sure you adjust one of the other zones to force a call for heat in it, After a few minutes, feel the pipes in the zone overheating and see if the pipes are getting hot (be careful). This is the same test to check for a stuck flow check valve.

Mar 05, 2011 | Air Conditioners

2 Answers

I am trying to wire this unit to a honeywell t stat model T87N1026


Wiring a new sub-panel to an isolation transformer is one method of wiring for balanced power. With a balanced power system, the power sent to each "hot" bus of the power panel is 50 percent per bus. This means that the total power of the system is split evenly between each side of the panel. Balanced power systems have the advantage of reduced noise generation. This characteristic makes this type of system great for audio.
1.Shut off the power feeding the isolation mains transformer at the main power panel. Use the documentation supplied with the isolation transformer to locate the center-tap wire on the secondary side of the transformer. Connect that wire to the sub-panel's ground bus bar.
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3.Insert each wire separately into each of the wire screw terminals.Tighten the screws to hold the wire in place. Do not over-tighten these screws. If there is a neutral wire, connect it to the neutral common bar. Once these screws are tight, close the sub-panel.8_8_2012_9_21_38_am.jpg

Jan 18, 2011 | Air Conditioners

2 Answers

White rodgers zone valve will not shut off by thermostat. you can shut off heat manually.


if this is a 13a zone valve it will have the wires in the front with a bunch of little holes for the wires. try to push each wire into there holes because sometimes they come loose and stop the valve from opening and closing. let me know how this works for you.

Dec 20, 2010 | Air Conditioners

1 Answer

We recently had Marley Double line break interrupter Thermostats installed as we could not turn our old thermostats "off". The lowest setting was 5'F. The heaters are in our cottage and when we...


Hi zone controlled thermostats are controlled normally by a master control stat that is wired ( linked ) to each zone. If you had them installed, they should have left you with the sequence of operation to explain to you how these stats work, and what to check in case of light trouble shooting? This I would insist on getting from them.Yes, I am sure they will click as each one is energized, but like I have said on all commercial heating and cooling thermostats that are zone controlled, even on a residential application, they came with a master control that sensed the temperature in that area where the zone covered, and the master received a signal to shut off the zone and automatically checked the other zones to see if they were calling for heat or cooling and would control the zone as needed. It doesn't make sense to me to have lets say 6 zones you are covering in the area of your cottage all alone like a thermostat.The click would be that it is either turning on the heat, or turning it off. This would be OK I assume, if they are controlling the heat and shutting the heaters off when you want them off, to save on your heating bill, but a programmable thermostat would do the exact same thing as the zone controllers, as these are used in office buildings, and for controlling hot water valves and dampers in the ceiling, as they have zone sensors located around the building to sense the temperature and send it back to a main controller. The zones are called slaves to this controller.I have never heard of this brand, most controllers for zone control are Johnston, Honeywell, Barber Coleman. I'm sure they are good, but I will need to find the sequence of operation, which I will get right on now. Hopefully, I can find out. If not, go back to the installer to get the paper work he should have left you explaining all to you and showing you the schematic on how they are arranged and operated either alone, or together. It just sounds to me like they are a digital sensor that senses the temperature, and maybe preset, or is adjustable inside for a certain comfort temperature, just like a programmable thermostat would do in this case. Please do what you can, and rate me on this, as I know you will be kind, but without a main control, I sincerely believe you are back where you started.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Industrial, Commercial, & Residential Contractor

Oct 28, 2010 | Air Conditioners

1 Answer

One of my 3 zone valves on my hot water base board heatig system


You need to check for power to the zone. If you have power then the valve is bad and needs replacement.

Mar 22, 2009 | Honeywell Air Conditioners

1 Answer

I have a radiant floor heating system with a wirsbo control system, i keep having to reset the system to get the zones to heat up again. The broiler is working fine. The first time I reset the radiant heat...


Is this a water circulating system? If so there are bleeder ports on your radiant heating zones on the floor that you can bleed the air out of the system. They look like a tire air pressure valve. Depress the valve core with a small screwdriver or something of the same nature. You will hear air coming out and water will come out. This is done while system is running. Also it may maybe under pressurized, circulating pump could be shutting down. Does the boiler keep running or shut down on reset. If it does could be within the boiler itself. Please rsvp with more info.

Oct 02, 2008 | Air Conditioners

1 Answer

I have a 3 zone hot water system, and 1 zone is not working.I've tested the thermostat and it worked fine. I then adjusted the wire caps leading to the zone valve making sure the wires were not the issue.I...


Happy to assist you!
Perhaps a bad blower.

Sounds like an electronic failure you need a hands on diagnoses!
My words alone will not remedy the situation!
Do not wait to fix it next year to repair it!
The cost will be more then Bad Inflation!!!!!!!!!

You need to call service !!!!!!!!!!!!!
LET ME KNOW WHAT HAPPENS???

PLEASE GIVE ME A GOOD RATING HERE AT FIXYA.COM BEFORE YOU SIGN OFF

Aug 29, 2008 | Honeywell Air Conditioners

2 Answers

I have a vitodens 100-w combi boiler and tried to turn the heating on just to give it a working as was advised. However, I have no heat coming to my radiators. The boilers seems to be working as my hot...


Here's the deal: If your Vitodens 100 has outdoor temperature sensing capability, either built in or via external aftermarket control such as Tekmar or other, and the temperature outside is above warm weather shut down (WWSD), then the boiler will not operate for space heating, but will operate to make Domestic Hot Water (DHW) only. Generally speaking WWSD is facoty set at 20*C, since this is normal room temperature so the boiler will not need to operate at temperatures above this number as it is warm enough outdoors to heat the house to comfortable levels.
If your Vitodens 100 does not have outdoor temperature sensing capability then you should check to see if your room thermostats are operational and calling for heat since the boiler is only responding to this on-off control based on room temperature. (turn up your room thermostats)
In both cases you need to make sure that your heating system's distribution pump and zone valves are operating correctly.
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Good luck.

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