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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

Posted on Apr 27, 2014

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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...

1 Answer

I have a hot water boiler with 3 zone valves and 2 circulation pumps. I see no relays wired to pumps. Pumps run constantly


Sounds like a lot of unknowns from your article. Here are some basic checks

- if they are the honeywell zone valves and you try to open them and get resistance than 9/10 times the t-stat is not calling for heat and the valve should be closed
-if stat is calling and wants heat zone valve lever should be free of resistance when moving it
- 15-20 psi is a little high but could be normal based on the size of your place and the temperature you are reading these pressures at
-with the pumps always running seems to me that the pumps are hard wired to a constant electrical source, if you want optimal control install a taco zone controller

May 21, 2017 | Water Heaters

1 Answer

One of my heat zones doesnt close when the thermostat is OFF.


If the circulator pump is not running It may be that another circulator pump is forcing boiler water through that zone when it runs,if so , you may have to install a zone valve to make sure the zone is completely closed off when not in use. Hope this helps.

Dec 31, 2013 | Heating & Cooling

1 Answer

First My sister inlaw has a 3/4 recirc line. used the by pass h&c under last faucet to use cold as recircu line. Note acutal 3/4recirc is in kitchen but even thou closer to water htr. it is last for...


I don't understand everything being asked, so add a comment any time.

Problem1 is excessive electric bill.
Suspect is new 120Volt Taco recirculation pump.
Look at motor nameplate for amps and watts and HP. Taco pump is usually robust 1/3 HP which is 252 watts or same as running four 60 watt light bulbs.
If pump runs 18 hours per day x 252 watts = 4536 watts or 4.5 Kilowatts per day
Buy a kill-o-watt meter that plugs into outlet, and plug Taco pump into the meter for 48 hours.
This will give you total watts used for that time period.
1000 watts = 1 kilowatt.
Electric bill is probably 12 to 20 cents per kilowatt.
So if Taco uses 4.5 kilowatts per day, that is $.54 to $.90 per day multiplied by 30 days.
So cost is $15 to $30 per month.

Problem2 is Taco runs too long.
Taco operates either by thermostat or by timer. You choose which mode by using slide switch that is usually located under the timer dial. Set switch to TIMER to use timer, and ON to use thermostat, and off to turn TACO off.
If Taco is set for thermostatic operation, the Taco might be defective. Or there could be crossover problem at single handled faucet.
Another problem could be air in the water line: install air vent.
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/How-to-set-timers.html

Jul 17, 2011 | Taco 1/2" 006 BC4-TAC Circulator Pump/...

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 | Heating & Cooling

1 Answer

I have a two zone water baseboard system... I installed a new zone valve to the upper zone which was not calling for heat.. the only heat it got was when the lower zone was circulating... Now the upper...


Good clues to work with--
Let's review how you wired up the Zone Valves, in relation to the Boiler Control panel...

You say the upper zone does NOT SHUT DOWN--
Does that mean it is OPEN ALL THE TIME?-- (even when the circulating pump is OFF? )
That sounds like the thermostat is not even in the circuit, then.

Have you been able to cycle each of the valves thru their cycles-- Open- and then closed?
-- It almost sounds like you have an interconnection between the two valves-- is this possible?

Each Thermostat has to control its valve only...
and most systems do this thru a control panel at the boiler--
So-- How is your control panel connected to the 2 thermostats, and how are the 2 zone valves connected to the Control board?

Are you following a wiring schematic for hooking the valves and thermostats to the control board?
There should be a schematic with the new valve you must installed, right?
did you wire it like the instructions showed?

Make a few more tests, and get back with us--

Mack B

Jan 18, 2011 | Heating & Cooling

1 Answer

How do i install a zone valve in my hot water heater. I need the schematic from boiler controller to the valve. if I tie the first floor to one valve , the rooms (2) will be on the last section before the...


The two zones have seperate supply and returns, correct? If not zoning will not be possible without piping the system in that way. Assuming the piping is correct, for two zones, you will need two zone valves, one cut into each zone. The wiring will vary, but for a 3 wire zone valve, (Taco), power from the transfomer goes through the thermostat, into terminal 1 on the Zone Valve, Terminal 2 on the zone valve goes back to the transformer, (24v common), and also to one "T" terminal on the aquastat (boiler control), and Terminal 3 on the zone valve goes to the other "T" terminal on the aquastat.

For a Honeywell, or other motorized Zone Valve, power again goes from the transformer, through the thermostat and into one side of the motor contacts/wires (depending on brand), the other motor wire goes back to the transformer, (24v common) Then the two end switch contact/wires go back to the T T terminals on the aquastat.

If you are using motorized zone valves, and only 2 of them, the transformer in the aquastat will be strong enough to power them.

Hope this helps

Jul 04, 2009 | Kenmore 75944 Gas Dryer

1 Answer

Short burn cycles


if thats a new themostst it sounds like you didnt set the cycle dip switches correctly,the type of heat you have is unknown to the thermostat so you have to tell it or it may short cycle or overheat

May 02, 2009 | Honeywell Heating & Cooling

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 Heating & Cooling

1 Answer

Zone valve on my Burnham gas furnace keeps running hot continually. How do I manually shut it off? All wires look good and are connected. The other 2 zones work fine.


ASSUMING THAT YOU HAVE HOT WATER SYSTEM,IT IS TIME TO THINK ABOUT REPLACING THE ZONE VALVE.IF YOU DISCONNECT THE ZONE VALVE,THAT AREA WILL NOT GET
ANY HEAT.IF YOU CAN GET THROUGH REST OF THE HEATING SEASON WITHOUT IT,TURN OFF THE POWER TO THE ENTIRE SYSTEM.THEN DISCONNECT THE POWER SUPPLY TO JUST THAT VALVE.BE CAREFUL TO PUT WIRE NUTS ON ANY EXPOSED BARE WIRES.YOU CAN THEN RESTORE POWER TO THE MAIN SYSTEM.

Mar 07, 2009 | Honeywell Programmable Thermostat Heater

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