s safer to refer to the F modesorel lennox lace boot size 9

It's safer to refer to the F model but I found it listed both ways.

Heating System Zone Valve Failure Rates, Failure Data, Honeywell vs Taco Will putting the lever in a closed position cause any issues? The one problem zone valve opens when I adjust the thermostat but the hot water only flows to the valve and a little beyond then the line starts cooling down and I have no heat in that area. This article series answers most questions about Heating System Boiler Controls on central heating systems to aid in troubleshooting, inspection, diagnosis, and repairs. dissolved oxygen, which is found in systems that have a Among zone valves are models that are

I have 3 separate zone valves in my home. (turn it off and wait) Watch out: however, for wiring errors, short circuits, or a misbehaving low voltage transformer. It's not clear to me that the added heat from the 40VA transformer wiring that powers this zone valve would normally be sufficient to contribute to the product's failure in the field.



A slow-closing type zone valve may cause banging heating pipes if installed backwards.

Readers should also see inspectapedia.com/heat/Low-Voltage-Transformer-Test.php





Zone valve bad??

Thanks Dennis, indeed you are perfectly correct: the HONEYWELL V8043D zone valve [PDF installation instructions] is a "normally open" valve while the Honeywell V8043C, F, or G models are "normally closed". Steven: It's common for the body of the zone valve to be hot as it's passing hot water for the heating system.



I've seen more Honeywell than Taco zone valves installed, but I have no actual zone valve failure rate data that demonstrates one BRAND is "better" than the other. Watch out: for conditions that could contribute to zone valve failure.

By locating the circulator downstream from the return-side zone valves - that is, between the zone controls and the boiler, the impact of the pump start-up on the zone valve is reduced.

1. responds to a thermostat's call for heat Otherwise the thermostat will need replacement.

The motor sits atop and operates a mechanical shaft that, by rotating, opens and closes the zone valve in response to a call for heat from the thermostat. Does the pipe need to be cut to install a zone valve. If the zones do NOT heat any rooms with plumbing you may be ok.

(Fig. I took a look at the boiler.



but if it's the valve itself I'd expect to turn off water and remove pressure from the zone.



Keep me posted, On 2021-05-24



Do i have flow issue.

side B of motor switch closes (providing a low voltage auxiliary

Integral end-switch

HEAT WON'T TURN OFF, I have my thermostat turned down lowest it can go but the furnace keeps coming on, It heats hot water. The normally closed valve only uses power to open the valve when heat is called for, .The application that we have is residential, but was originally installed when the house was built 29 years ago.

In an unfamiliar home I might try dropping the thermostat set temperature gradually in very cold weather, double-checking to see just how cold the room gets. should I consider replacing the valve or turning on the heat to clear the system and then turn it down? I have an overheated Taco zone control valve, that is always hot, even when the boiler is off and water temp in it is down to 100 degrees with cold pipes.



The room temperature is 22 C and yet the thermostat is down all the way. We welcome your further photos, comments, questions. The installer surely had a reason for the "normally-open" approach.

At times it seems to be working normally; but at other times It will not call for heat until I turn the thermostat up for another zone valve. -, I turned my thermostat right off and the valve cooled slightly to warm to touch but still makes humming sound - When changing the thermostat, there are some models that can be wired to operate either type of zone valve: normally closed or normally open.

See INDIRECT-FIRED WATER HEATERS for details.

The Honeywell V8043F has these same features. Many homeowners can do such a repair.

A separate loop of piping conducts water from a nearby heating boiler, through the coil in the bottom of the indirect fired water heater tank (thus transferring heat to water in the water heater tank), and back to the heating boiler.

contain dissolved oxygen in the system water. When the thermostat

Is this a pretty easy fix for the homeowner? @Jason, The valves cannot be moved to return lines without a lot of work. And I agree you'd need to look at thermostats and wiring if changing the zone valve type as a normally-open zone valve requires a reverse-acting thermostat (as you indicated).

@Anonymous,

The motor stops with keep us posted. It's possible that there is air in the noisy zone, or that the zone valve actuator motor is buzzing and failing, or that a relay is buzzing;

Your advice would be appreciated.

NC - Normally-closed, and use a signal to open the valve

by use of zone valves (one per heating zone or area or "loop" of heating piping) which in turn are connected to individual thermostats.

Soon thereafter side A of motor You can still drain and turn off 3 of the zones but you'll need a plumber to find the END of each of the loops you want to turn off - right where it joins a common return line. For that work, the job probably goes faster and easier when done by a trained heating service tech or plumber who is familiar with zone valve replacement.

Sketch (left) courtesy of Carson Dunlop Associates. At any water heating equipment, such as a heating boiler or a water heater, water hammer risks an additional hazard besides noise: water hammer can cause leaks at the temperature/pressure relief valve.



- cool down the heating system If you give us the zone valve brand and model we can research further.

Could my circulator pump be bad although the other three zones are working?

You can know that the valve is open if hot water is felt in the pipe on the output side of the zone valve. An alternative, and the one that I use, is to keep all 5 zones working, but set the thermostats for the three unused areas to a lower than usual temperature, just high enough to avoid freeze-ups - say 45 F. The

But Watch out: wiring a MIX of the two brands on a single heating system requires some care as the two brands are not wired identically.

Forgive the slow reply - we've been swamped with questions. permit more detailed control of heat distribution in a building.

and

On 2021-01-21 by (mod) 5 individual room thermostats.

Therefore a simple 2 wire thermostat will not work without a relay to send current to the off wires when the thermostat turns off, or a special thermostat that sends current one way when heat is on, and current through another wire to turn the valve off.

Use this valve in hydronic systems which DO NOT

@Trevor,

We discuss that in this article series. That means "interrupting" or cutting the pipe to place the valve in the path of water flow.

While typical indirect water heaters use a heating loop encompassing a circulator pump and check valve, some systems may use a zone valve in this piping loop that first opens to let hot water flow though the piping loop (boiler to water heater coil and back to boiler), and second, when the valve has opened, it turns on a circulator pump to cause water movement.

holding circuit to prevent the valve from stopping part way



I dont know if I need to depressurize my system or drain it before I do any of that (or how to do those things, but would love to save my self hundreds to thousands of dollars from doing it myself), @Jon Green, Thanks for pointing out the operation of the WR-1311 Zone Valve Nikki

Just before the valve reaches the full-open position,

contain dissolved oxygen in the system water. PLUMBING NOISE TYPE CHECKLIST Have a boiler with three zones, two for upstairs, one downstairs.

Turned up thermostat - got heat and no more noise.

I have made the mistake of removing and tossing a part whose function I couldn't understand.

Bottom line: Both Honeywell and Taco make reliable zone valves. This was a professional installation not DIY. Probably one thermostats at a time.



The voltage will sag, the current will go through the roof, and you'll burn the windings on those tiny synchronous motors.

On 2021-06-04 This arrangement (or a simple check valve) prevents water in the hot water tank from being heated by the boiler when it is not needed (circulating by convection, for example). Jay



There are also specific thermostats required for each type of valve. 5 loops of hot water heating piping leaving the boiler (one at each zone valve)

Continue readingat ZONE VALVE MANUALS & WIRING or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.



Zone valves and Taco circulator pumps are, most-basically, associated with hot water heat delivered through radiators or baseboards or convectors. - cut out and sweat in new valves so all good.

"Always hot" circulator suggests a failed or failing motor or control.

Please let us know if you have additional questions.

- drain off pressure and water from the lines enough that the piping in the area of work is empty (so it can be soldered) NO - Normally-Open, and use a current to close the valve

They would only require power when heat is called for and may not heat up as much. These valves require thermostats to send current to the valve to turn it on,, but then the valves require current to the opposite wires to turn the valve to the off position.

what is the hot water pressure for heating system normally? We have a hot water boiler with 7 normally open Honeywell zone valves.

Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Is this whats causing the system to fire up?



You'll save significantly just by dropping the thermostat set temperature.

replacing boiler zone valves (have boiler serving 8 condominium units), which is better: taco zone actuator or Honeywell mechanical valve?

Please find your question and my detailed reply now at the Reader Q&A section near the bottom of the article above on this page. But a humming sound may mean that the valve's motor is jamming (needs replacement) OR that a nearby low voltage transformer is humming and will need replacement soon.

what can cause long delays in my hot water heating system actually having heat coming out of the registers?

inside the valve to deteriorate and eventually fail. I have a Burnham v8h boiler system I removed the analog thermostats and replaced them with programmable Honeywell stats now the zone valves turn on at the correct temperature but do not turn off. On 2020-11-04 - by (mod) - How do we know that a zone valve is working?

calls for heat in a particular building area, the thermostat switch causes the zone valve to open, to permit hot water to flow through that zone.

inside the valve to deteriorate and eventually fail.

But yeah, there can indeed be a "left-over" control from discontinued equipment or devices. position.

circuit for starting burner and/or circulator).

The photo above shows a bank of six zone valves controlling heat distribution in a large home.

Just curious about the query whose 7 zone valves keep failing once a year. We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

- Lisa, Most likely you have

But you could argue that in the event of loss of heat but not loss of power, you'd gain that advantage. @Gene Lair, The thermostat is at the lowest setting but our oil in floor heating system still fires up here and there (we dont want the oil in floor on since we have electric heat pumps running). If not then I suspect the zone valve end switch isn't working.

breaks the holding contact.

LOW VOLTAGE TRANSFORMER TEST

There are two different situation:

Other brands of zone valves such as those made by Flair (TM) (problem prone - shown below), and White Rodgers work similarly but their wiring may be slightly different.

I hope this helps. @Liz O'Connor, On 2021-05-13 by (mod) - diagnose zone that sometimes does not open. I'm unclear what kind of heat we are discussing.



If you continue to have annoying water hammer banging when the circulator pump starts (or stops) consider changing out your zone valves to a slow closing valve such as the Taco #570. - which is a bit unclear to me since in a power failure the heat is off and the circulator pump is off too - nothing is circulating.



(open the boiler drain, using a hose to direct water to a safe drain location)

A typical design will include a thermostat on the water heater that will cause hot water from a physically separate heating boiler to circulate through the heating coil located in the bottom of the indirect-fired water heater.



Thanks for all of the information it will help us in making a decision.

Check to see if the circulator is being turned on. Use the on Page search box to look for our article series.

But if you see a zone valve with the cover off (photo at left) that may be a clue that the valve has been having problems with jamming or sticking - someone left the cover off to try to keep the valve a little cooler.

The heating system installer or service technician addresses this heat imbalance by fine-tuning the volume or the rate at which heating water is delivered to different building areas.

boiler) and a single circulator pump (usually located on the return end of the hot water piping close to the heating boiler). The temperatures of the circulating hot water are, in my OPINION more likely to be a factor in zone valve life. Since we have no idea what type of noise you're hearing, please first look at this article However, the 2 radiators in the extension are tapped off the 22mm feed to the main house and have a 2 port Honeywell Motorised Zone Valve in the loop (not in the 22mm).

Wendy

Why would anyone want a valve like that, instead of a spring or mechanism that just turns the valve automatically to the off position when the thermostat turns off?

i have no idea the close water pressure test for the zone valve by the manufacturer. - op cit.

Three out of the four zones are working correctly.

More diagnostic suggestions are at HEATING SYSTEM NOISE DIAGNOSIS https://inspectapedia.com/heat/Heating_Noise_Diagnosis.php, I have gas fired boiler laars mini therm jvs model and when one zone calls for hest boiler makes sound like plane passing by over the house but when two zones are calling for heat boiler runs fine snd the noise goes away.

"Complaints" are anecdotal reports, not peer-reviewed expert research on failure rates. However if you are going to the trouble of rearranging or re-sweating zone valves at a hot water heating boiler, I'd see if it were possible to put the valves on the return side of the boiler - cooler water temperatures there may improve zone valve life.

When the call for heat stops, the valve closes to stop circulating hot water.

Reply: Norby,

on AIR-BOUND HEATING SYSTEMS to see how to diagnose and repair the problem. When the circulator pump is running you should be able to feel the heating pipe on the inlet and Outlet side of a zone valve go from being cool or cold to hot.



They are mounted on the hot side of the boiler. Good practice locates the zone controls and circulators on the return side of the hydronic heating loop.

Is reached the thermostat cuts off power and the valve closes (by spring pressure) cutting off fluid flow. It uses a two-wire, 24-volt control circuit and requires a SPST thermostat.

A of motor switch makes with contact 4 then breaks the potable water or steam.

As the

But IF there is heat coming out of your radiators and baseboards long after the thermostat has stopped calling for heat, then see InspectAPedia tolerates no conflicts of interest. by Inspectapedia Com Moderator - how to install a zone valve.

We often read about people hooking up too many zone valves to a single transformer, overloading it.

Checking the wiring (5 wire) against a wiring diagram the orange wire goes to a connecting block but no further.

Consider that the zone valve is nothing more than a mechanical water flow valve on a loop of hot water heating pipe that

can be replaced without removing valve body from line.

- HONEYWELL V8043D ZONE VALVE INSTRUCTIONS [PDF], Details on the risks of damage or component failure from dissolved oxygen in heating system water as well as suggestion on avoiding those hassles are now found.

I noticed that the Manual Operating Levers on the actuators were in a half open position. The instructions don't say why but from my reading and field experience I warn that if you hook up a heating zone valve backwards, depending on several other variables including zone valve brand and model and type as well as water velocity there may be trouble: To be fair, not all banging noises originate at a backwards zone valve. Typically the zone motor or actuator, (properly, the "zone motor assembly") including the White Rodgers models can be removed without interfering with piping

(Completing a circuit through contact 6 and the thermostat anticipator.)

Is this a residential building?

It may be necessary to add air bleeder or air purge valves to permit draining of individual heating zones.

If that's the problem you'll want to replace the zone valve head.

of the motor revolves 90 a new set of stationary contacts makes See AIR BLEED VALVE INSTALLATION On a call for heat the zone valve opens.

And over time a relief valve that leaks can also clog from mineral deposits and - to put it technically - crud on the valve seat.

I use the word "register" to refer to a warm air outlet - a furnace heating system - is your heat a water-to-air heating system? - op cit.

Just stopping current to the "ON" position will do nothing as the valve stays open.

How do you check a zone valve to see if it is working?

Typically heating systems using zone valves will have two or more zone valves (usually but not always located close to the heating 1 value is for the basement apartment.

If the zone valve failure is in the actuator motor, that's a pretty easy repair as the cover can be removed, the motor removed, and a replacement installed without having to do any plumbing work.

Our Comment Box is provided by Countable Web Productions countable.ca, Click to Show or Hide Citations & References, ZONE VALVE LIFE Affected by Boiler Water Chemistry, Honeywell V8043D ZONE VALVE INSTALLATION GUIDE, AIRBOUND HEAT SYSTEM REPAIR by WATER FEED VALVE, WHITE RODGERS 1311 ZONE VALVE INSTRUCTIONS, HOME INSPECTION EDUCATION COURSES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, The zone valve (installed backwards) may have trouble closing against the force of water being pushed or pulled by the circulator pump - a likely problem since in a zone valve system typically one circulator serves multiple zones (and zone valves), A flow restriction if you install the valve backwards, Banging heating pipes and possible valve damage when the valve closes as a consequence of load on or wear of the mechanically-operated valve gate, Banging heating pipes when the valve is closing or closed while another heating zone is calling for heat (more likely with fast-closing zone valves and with zone valves on zones operating at higher pressure or faster water circulating rates) (Some experts opine that a White Rodgers zone valve is more quiet-operating). If your heating system is giving a loud BANG when the zone valves open or close (and circulator starts or stops) take a look at the location of the zone valves.

My understanding is that the orange is normally intended as a feed to tell the boiler to fire. [The Honeywell Honeywell V8043 series zone valve is ] suitable for glycol/water mix up to 50:50 use in closed

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