ZoningSupply.com - Zone Control

HVAC Zone Controls & Zoning Dampers

New & Improved Rectangle Dampers available at ZoningSupply.com

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Tired of flimsy residential-grade rectangular dampers that easily bend and bind and, worse yet, stop working prematurely.  We, at ZoningSupply, are too!  And, we have the answer with this commercial-grade, super-duty rectangular damper.  Like all of our power dampers, it includes the best motor in the industry (Belimo) and now is constructed with heavy guage aluminim for rigidity and long-life.


Rectangle Damper

Rectangular HVAC Dampers
from 175.00

8" X 8" thru 24" X 24"
New & Improved Heavy-Duty
Aluminum rectangular damper w/ Ecojay by Belimo motor
Built to stand up to use and abuse


SHIPPING TIME: 2 Weeks (because they are made to order)
RETURNS for rectangular dampers require 35% restocking fee because they are custom made to order... make sure you order the correct size.

NOTE: Order "Height" for the side with the motor.

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No other rectangle zone damper on the market is as sturdy or reliable.  Simplicity of design and precision manufacturing in the USA (Ohio & Texas) make for the BEST rectangular damper that has ever been available to the residential zone control market.  Try it for yourself today.

Ashrae 62-2 Ventilation (Fresh Air) sizing & calculation

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Many homes these days have such tight seals around doors, windows, and even closed-cell foam insulation... they are almost air-tight.  You can think of an old house like an antique metal or wooden ice box where modern homes are more like Yeti coolers.  While this is great for keeping temperatures steady inside the home, it also can trap moisture and toxic gases inside.  Fresh air ventilation is necessary to keep a healthy and efficient home.

But how much fresh air is needed?  If you bring in too much, you will make your HVAC equipment work too hard and loose efficiency.  If not enough fresh air is brought into the home, the air can become humid and allow mold growth or VOCs and other toxins can build up.  Luckily, the national organization ASHRAE has a specific recommendation for the amount of air based on occupancy and square footage of the home.  See table below.

However, this table should not be taken as gospel.  Just like other HVAC calculations and estimations, many factors are not really being taken into account with this rough estimate based on # of bedrooms (occupancy) and square footage.  Some adjustments may be needed based on factors such as climate, ceiling height, other air-leakage, etc.  To comply with 62-2 is the baseline & adjustments can be made in the field by setting run-time.

Learn more about how SmartZone-4X can control fresh air more efficiently than a separate fresh-air controller in the Install Guide

Zoning for comfort and / or economy... basics of HVAC Zoning

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We have explained in other posts on ZoningSupply.com, when it comes to HVAC zoning, each application must be evaluated individually.  Situations vary widely from building to building, but, in all cases HVAC Zone Control puts the user (homeowner, building manager, etc) in control of comfort.

Let's rewind, what is zoning?  Homes and buildings that have "central" heating and air conditioning typically have 1 thermostat that controls the whole house temperature.  With zoning, multiple thermostats can be placed throughout the house to better control temperature throughout.  SmartZone connects to all of the thermostats & automatically controls dampers (air valves) installed in the air ducts.  These air ducts direct air from the heating & cooling equipment to the different areas or "zones" of the home/building.  The dampers allow SmartZone to direct air only where needed.

Once a SmartZone has been installed, you will have the ability to set each of the zone thermostats to whatever temperature or settings you desire.  SmartZone will, within reason, keep each zone at the correct temperature by running the equipment and directing hot or cold air into the zones only when necessary.  This achieves the purpose of comfort control to manage hot or cold areas of your home. 

As for energy savings, if some of the zones are rarely used and can stay off for a sufficient amount of time, the equipment will run for a shorter time to heat or cool the rest of the building.  This and other applications that allow the user to turn off or set-back one or more of the zones can, in some cases, result in energy savings.  Some sources have published % energy savings possible with zoning, however, this is too arbitrary to have any real meaning.  Like stated at the beginning, every application is different & the real possibility of energy savings is in the hands of the user and how the thermostats are set. 

Zoning is an amazing solution to comfort issues and gives the user ultimate control over comfort throughout the home or building.  However, zone control is NOT a magic bullet for energy savings.  HVAC Zoning only puts more control in the hands of the user & it is ultimately the thermostats and how they are set that determines potential energy savings.

Use Wifi thermostats with SmartZone for ultimate control over comfort and energy use.

Use Wifi thermostats with SmartZone for ultimate control over comfort and energy use.

The reality is that in a normal home with one thermostat, the only way to get more "comfort" is to spend more energy (ie run the AC or heat).  With zoning, you can stay more comfortable in some areas while reducing run-time by not heating/cooling other areas.

SmartZone is the best hvac zone control for upgrades or new-installs.  Order today and install yourself of call any HVAC contractor in your area for installation.

SmartZone is great opportunity for DISTRIBUTORS.

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There are many reasons that distributors should take a look at stocking SmartZone, but basically because they can make more money & have a higher customer satisfaction with a very low up-front investment.

  1. Only 2 models needed to cover all applications.
    A lot of manufacturers require stocking 5,6... even dozens of different products to get the best price.  With SmartZone, you only need the SmartZone-2 and the SmartZone-4X.  That's right, only 2 models will cover everything from 2 zones to 20 zones, single & multi-stage, gas/electric & heat pump (including dual fuel).  As a bonus, the SmartZone-4X has built-in Fresh-Air control.
  2. Best wholesale pricing.
    Options for small and large volume distributors with 30 day NET terms pending credit approval.  Start with a small order or only 10 zone controllers.  Contact ECOJAY (www.smartzoning.com) for details.
  3. Documentation & training.
    Ecojay is committed to supporting distributors with documentation, signs, marketing materials, phone & online support.  Ecojay will even do an in-person training for contractors at new distributor locations (minimum order required for free training - normal price for training $500)
  4. Increase zone control profits & sales.
    SmartZone has allowed many of our distributors to increase sales of zoning because it is so much easier for contractors to use & install... they buy more.  Distributors of SmartZone also have increased margins on the higher-end controllers because SmartZone-4X can do everything the Honeywell HZ432 can do at a much lower price.
  5. Contractors will love you for it.
    Even contractors that "don't do zoning" occasionally come across a system that needs it or a customer that wants it.  SmartZone is the best the the occasional zoning contractor or the contractor that does it every day.  Most contractors that try it, don't want to use anything else.

Right now, only about 25-35% of the US has physical distribution of ECOJAY products, specifically SmartZone.  This is a HUGE missed opportunity.  Online distribution reaches nationwide, but even this is in it's infancy.  SmartZone deserves to be on the shelf of your local distributor and contractors deserve to have access to it.  Right now it is available on Amazon.com, Ebay, ZoningSupply.com for contractors in the US & Canada to have in a couple of days shipping time.

It would be great if some of the large online supply houses like ... Supplyhouse.com or AlpineAir.com would stock SmartZone so it could be purchased and shipped along with systems.  Or some of the national-chain distributors like Johnstone would also carry SmartZone for the sake of availability and exposure to SmartZone style zoning.

SmartZone is not a new gimmic in zoning, it is simply the BEST traditional forced-air zone control board that is available.  SmartZone has been designed with the HVAC contractor in mind and it shows with the feedback that is received over and over again from contractors.  SmartZone has been shipping since 2004 and has had rave reviews from the beginning. 

Contractors that never liked zoning before even love SmartZone.  Many of the problems that people had 10 or 15 years ago with zoning such as freezing coils or short cycling have been solved by more sophisticated zone controls but SmartZone made it simple.  Using Ecojay SmartZone makes zoning simple.


Fact or Myth? #HVAC #Zonecontrol can save energy

homeowners, HVAC Contractorszoning supplyComment
SmartZone zone control

First of all, if you are not familiar with HVAC Zoning (Zone control) for your home you can click here and learn more about how it works.

Sometimes, zoning is pitched as a device that can be added to your current HVAC system that will "save you energy" because you are able to turn "off" heating and cooling to areas that are not being used.  Sounds good, right?  Well...there a "but."  This as actually a highly debated or more aptly put... highly contested claim among HVAC professionals.

The simple fact is that it isn't a simple answer but the simplest version is:  HVAC Zoning CAN save energy in some applications.

Not all applications of zoning are intended to save energy, some are set up to optimize comfort.  In these situations, energy savings may not the top priority but it can still be set up to help save energy when the comfort is not in demand.

Zoning puts the control in the hands of the user (homeowner) via the thermostats.  These thermostats can be set to optimize energy savings or comfort... or, most likely, somewhere in between.

Some believe the primary purpose of zoning is comfort & I would agree, but, SmartZone can be used in some applications to save energy by reducing necessary run-time.

As far as I have found there have been very few and NO independent studies on the energy savings capabilities of hvac zone control but I have personally been in the industry for 14 years and I believe I know why.  Every test I have seen is try to prove some % of energy savings and yet there is a flaw with even the question that is being asked.  The problem with this question is that it is looking for an automatic percentage saving when zoning is installed.  I think this gets to the heart of why the professionals that dispute zone control's ability to "save energy" do so. 

This is an IMPORTANT NOTE:  HVAC Zone Control by itself will NOT save energy.  However, it CAN be used to save energy.

A proper study to prove that zone control CAN save energy would be straight-forward.   Two identical houses with identical hvac systems, one with a 2 zone system & the other with a single thermostat.  On the house with zoning, set one thermostat to OFF 12 hours per day and the other thermostat to run a normal 24hr / 7 day schedule.  The thermostat schedule should be the same as the 24hr / 7 day schedule in the house with only one thermostat.  This study would show that zoning can save energy if used in certain ways.

SmartZone has been around since 2004 and we have over 200,000 installed in the field.  We have seen direct feedback that empirically shows energy savings, not just in isolated cases but in extremely high volume.  First hand, real-world experience shows that it can be done, but it also shows that in cases where comfort is the priority... energy savings isn't a guarantee with zone control.

Check out SmartZone at ZoningSupply.com

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Eliminate BYPASS on a Zoning System?

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There has been a lot of buzz around eliminating bypass more so lately, but it has been talked about for 20+ years.  Some states have even mandated that all new Zoning systems be installed without bypass in certain types of buildings.  Others have argued against bypass for many years but only recently have HVAC zone control manufacturers offered products specifically designed to eliminate bypass.  Although these products are new, the principals they employ are NOT.  The different products on the market are just elaborate ways of "leaking" air into zones or areas that are not calling for it.

At ZoningSupply.com we rely on more than 2 decades of HVAC Zoning experience to come up with our recommendations and with regard to eliminating bypass, we do have some suggestions of applications with SmartZone that have worked well.

First of all, how many zones do you have?  The more zones you have the more difficulty you will have operating without a bypass.  It becomes more challenging because the amount of surplus air and air pressure in your duct work increases when (worst case scenario) your smallest zone is the only zone calling and all other zone dampers are closed.  A zone system with more than 4 zones needs bypass almost certainly.

Secondly, how large are your zones ducts?  Are they capable of handling the excess CFM of air that will be generated when other zones close?  Most duct can handle much more airflow than it is designed for but only up to a point.  Make sure that the smallest zone is capable of handling most or all of the airflow when the other zones are closed.  If the smallest zone is NOT capable of handling ALL of the airflow then there are at least a couple of options of techniques that can be used to possibly still eliminate bypass.

Airflow management techniques that can be used in conjunction with each other to reduce or eliminate the need for bypass on a zoning system:

  1. Over-sized ducts - increase the size of ducts and dampers beyond normal spec.
  2. Leak into zones - adjust the dampers stop screws so the dampers "leak" a fixed amount of air into some or all zones (no more than 25% recommended into each zone).
  3. Dump zone -  a room or rooms where the duct does not have a damper and will receive air flow any time the hvac system is running.
  4. Managed dump zone - use a "bypass" damper connected to "dump" duct into any or all zones.  Adjust the bypass damper to stabilize the static pressure when the smallest zone only is calling.  This is much preferable to the other "Dump Zone" because you are not dumping air when it isn't necessary which can affect air speed.
Use set screw on ecojay motor to "leak" air into NON-calling zones.

Use set screw on ecojay motor to "leak" air into NON-calling zones.

Multi-stage HVAC equipment - If your current hvac system has multi-stage (2 or more speeds) SmartZone can select the appropriate speed based on the number of zones calling (if set to 2nd-Stage Lock).  This capability can significantly reduce the amount of surplus air volume and pressure that would normally be bypassed because when only 1 zone is calling, the equipment will be in low speed.

Even with all of these techniques there are some systems and applications that just must have a bypass & for that we recommend the static pressure controlled version.  You can find more about why this is best in another blog post on ZoningSupply.com.

When it comes down to it, with Bypass or any other type of pressure relief on a zoning system, there is a balancing act between air velocity/noise.  You want to relieve or bypass as little air as possible to maintain efficiency of the HVAC system, however, with zoning it is inevitable that the air velocity will be come too high when only one zone is calling and that is why some combination of the techniques discussed should be used with any zone control system.

NEW to ZoningSupply - Insertable (Retrofit) Dampers

HVAC Contractors, Productszoning supplyComment

We are proud to announce the continuation of our damper product line here at ZoningSupply.com with the "Insert-able" damper.

Ecojay SmartZone Slip-in insertable damper

Some applications call for dampers that can be "slipped" into round duct that is spiral or other hard pipe style duct.  This is not intended for use with flex-duct but can be used with any other type of hard duct.  Simply cut a slit in the duct, insert the damper and screw it down.

Ecojay SmartZone Insertable Damper
PRO-Grade Insert Zone Damper (Retrofit)
from 89.00

4", 5", 6", 7", 8", 9", 10", 12" ROUND Diameter Dampers

Industry-leading quality & highest reliability, Belimo Motor, Full-seal gasket blade, makes mounting in any round duct easy with these super-heavy duty retro-fit slip-in dampers

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Spring is HVAC maintenance season... think about Zone Control.

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With warmer weather approaching, upstairs or certain areas of your home can become uncomfortably warm without SmartZone. HVAC zone control can make the entire home more comfortable in the hottest Summer months. 

Most homes with a single thermostat have some issues with keeping everyone, everywhere in the house comfortable.  With SmartZone, thermostats are places throughout the home to achieve comfort everywhere... and if you choose to turn off some of the areas (zones), you can even save energy.  Most importantly, however, SmartZone can make your home more comfortable than it is now.  See the slides below for how it works.

How it works...

  1. SmartZone is connected to several Thermostats placed in "zones" throughout the home or building.
  2. SmartZone is connected to the Air Conditioning (AC) and Heating equipment.
  3. Dampers (air valves) are installed in the existing ducts that connect to room vents in the "zones."
  4. SmartZone controls the AC & Heating equipment AND opens/closes dampers to control air to the zones based on the thermostats.

There is obviously a lot more to HVAC Zone control than the above bullet points.  Bypass & static pressure, duct sizing & damper leakage, thermostat & equipment types, equipment modes & changeover, compressor staging, emergency & auxiliary heat... and much more.  The good news is that SmartZone takes the guess work out of the potential complications of zoning.  Check out more about why SmartZone is the best choice here.

NEW Take-Off (Starting-Collar) Dampers from ECOJAY

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Introducing Take-Off Dampers

ecojay smartzone take-off damper 1
ecojay smartzone takeoff 2

A great value... priced at the same as standard PRO-Grade dampers.  Sizes from 6" - 18" available.

NOW available from ZoningSupply.com

Save time & money with these "TAKE-OFF" dampers.  Simply cut a hole in the plenum or duct & use the adhesive flange to attach to any flat surface.  Add a couple of screws for stability and you are done.  No need to strap or anything.  Just connect the duct.

  • Low profile for tight spaces
  • Belimo Motor
  • Sturdy construction
  • Made in the USA
  • All metal shaft, collar & can
  • Flex-poly for best seal
from 99.00
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Ecojay continues it's tradition of quality and innovation with it's latest release of the "take-off" style zone damper.  It is made in the USA and comes with a 5 year warranty.  All-metal construction & a BelimoTM motor make this the most reliable take-off on the market.  The poly-seal blade has been specially selected for durability inside the environment of ductwork.  Just like the PRO-GRADE dampers from ECOJAY, this take-off style is built with durability and longevity in mind.   Many others on the market are flimsy and not made to last... if you have ever been frustrated with a poor quality damper, Ecojay dampers are the answer.  You won't ever want to use any other damper brand again after trying the PRO-GRADE SmartZone dampers from Ecojay.

ALSO TRY SmartZone HVAC Zone Controllers:

199.00 299.00
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from 99.00
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New energy regulation standards force 24VAC Transformer change

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As of RIGHT NOW, ZoningSupply transformers will no longer have LED indicators or "resettable" fuses built in.  This is due to some new governmental regulations that apply to all power supplies less than 250W.  They must have lower power usage (wattage) when not in use.


24Vac Transformer
19.99 24.00
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You can thank the Department of Energy (DOE) for this rule they implemented back in 2012 that is just now taking effect.  A few milliamps to power an LED seems like a lot of effort for not much gain... however, anything that reduces energy usage is ok with us.

SmartZone-4X Zone Panel - Quick Wiring & Setup Video

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Introducing a new video (no Audio) showing the simple wiring process & quick setup procedure of the SmartZone-4X board.  (Applies to SmartZone-2X also).

In less than 5 minutes (real-time) this SmartZone board is wired and configured for single stage compressor with electric heat & four zones with power dampers.

To learn more about DIP SWITCH settings click here.

199.00 299.00

Universal 4-Zone Controller

Replace almost any brand existing zone control ... use with any thermostats (even WiFi like nest and ecobee).

Control heating and cooling comfort room by room.

  • EASY INSTALLATION - no screwdriver or voltmeter required
  • UNIVERSAL COMPATIBILITY - drop in replacement for many models (see list in Additional Info)
  • BEST FEATURES - built in Fresh Air Control, expansion port up to 20 Zones
  • SUPPLY AIR TEMP SENSOR - included for Smart-Staging & equipment protection
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Hot upstairs "bonus" room? Cold downstairs during the winter?

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SmartZone HVAC Zone control

These and many other common problems can occur during the winter months when the heater is running more than normal.  This can especially happen in areas that have cooling systems to handle warm and hot summer months.  The duct is often designed to be optimized in the summer months and when heat season rolls around, the airflow balance is all wrong.  The solution is Zone Control.  Even in the best designed duct systems, dampers are often used to balance the airflow on site.  This is tedious and inexact... but with SmartZone controls and power dampers, your home can be comfortable everywhere year round.

"I have personally been in too many to count homes with two stories that NEED zoning... there is nothing wrong with the equipment capacity or the ductwork, they just need the ability to direct airflow in the areas that need it in different seasons of the year or even times of day"  -- SmartZone Contractor

See how it works in more detail here

Introducing SmartZone Rectangular Dampers

zoning supplyComment

After many requests, we are now excited to be offering the Ecojay SmartZone series of rectangular power-open, power-closed dampers on ZoningSupply.com.  Available in over 80 different sizes from 8x8 to 24x24, these all-aluminum rectangular power dampers come equipped with the same top-quality Ecojay actuator (made by Belimo).  Much like our round dampers, the rectangular dampers have the highest-in-class reliability and come with a manufacturer's 5-year warranty.  If you have any questions, please contact us.


Rectangular HVAC Dampers
from 175.00
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NOTE: Because rectangular dampers are custom built to order, there is a 2 week lead time & all orders are subject to 25% re-stocking fee if returned.

Happy New Year - 2017

zoning supplyComment

ZoningSupply.com is looking forward to serving zone controls customers in 2017.  We had a fantastic 2016 and in 2017 we will have even more to offer.

If you have any HVAC zoning needs, look no further... we have products to satisfy even the most discerning customers & fit almost every zone control application.  ALL of the products offered by ZoningSupply.com are the best-in-class... from super-duty dampers to sophisticated zone control panels.  We continue to offer free shipping and the BEST technical support available anywhere.  All products are easy to install, simple to configure & come with 5-year manufacturer warranty.

Click here to start exploring what ZoningSupply.com has to offer

SmartZone is great for fireplace season... no more cold areas.

homeowners, Other HVACzoning supplyComment

Most people enjoy a good crackling fireplace when it's cold and snowy during the winter months even it isn't the primary source of heat for our homes these days... at least for most of us.  One problem that is common with homes that only have a single thermostat (no zoning) is that when a fire is burning, areas away from the fire get colder than the rest of the house.  Zone control can be the perfect solution...

2016 USER QUESTIONS - SmartZone Advanced

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Photo by BackyardProduction/iStock / Getty Images

QUESTION: I have two 9580 thermostats one in the office, the other in the main hangar bay (two zones).  When heating both zones or only the hangar, I need the furnace to go full blower with normal scheduling through stages 1 and 2.  When servicing only the small office area, I don't want the system to advance from stage 1.  Unfortunately, the office is so small and the modulating schedule of the furnace is still too much airflow for the office (the zone bypass when servicing the office is the main hangar modulating damper that is controlled via SPC (excess dumps into hangar)).  This damper will be wide open during call for hangar heat.  The main damper control logic is managed through a 3PDT  24 Vac relay. So, I need to block out stage 2 from only 1 zone (office).  The zone ramping schedule of the 9580 works well with the 100k modulating furnace control board, and would like to keep that capability. 

ANSWER: Configure the zone 1 thermostat connector STAT TYPE to G2 (conventional gas/electric) or H2 (heat pump) to allow the thermostat to control staging and use the hangar thermostat on zone 1. Wire only the stage 1 circuits (Y1 and W1) on the office thermostat to the zone 2 thermostat connector (Also connect R, C and G wires). Set dipswitch 4 to the LOCKOUT position. This will configure the zone controller to allow 2nd stage only when the hangar thermostat calls for 2nd stage regardless of whether the office thermostat is calling. When the office thermostat is calling and the hangar thermostat is not, SmartZone will not allow 2nd stage to operate.

I called last week to inquire about using this zone controller in a hangar that had a small office area and a large bay. I advised the call taker that I had Honeywell 9580. I also asked about the capability of the zone controller to handle the smaller office area’s lower CFM requirement and whether or not I could defeat the step-up from W1/Y1 to W2/Y2. I was told that the controller can be set up to defeat the stage step-ups.

After reading the manual, I found that there are no multi-stage inputs on the controller board from thermostats. So, basically, the capabilities of the Honeywell 9580 are wasted. Also, the stage defeat is for the whole system, not zone-specific as I need. It would be pointless to defeat stage increases while heating/cooling a large hangar space

ANSWER: The SmartZone controller typically controls staging based on the total system conditions which is the most efficient way to operate a multi-zoned multi-staged hvac system. However, the zone1 thermostat connector on SmartZone can be configured to allow the thermostat to control staging (refer to the top of page 10 of the installation manual). When the zone1 thermostat is configured for staging the ability to lockout 2nd stage with only 1 zone calling is disabled. With the thermostat controlling staging your ability to limit staging will be determined by the features of your Honeywell 9580 instead of the SmartZone control.

I have a honeywell mastertrol2 mm2, i wanted to update my thermostats but my zone controller has separate b and o wires going to thermostats . Will updating my zone controller to a smart zone 2 help this problem?

ANSWER: Updating your zone controller to a SmartZone 2 zone controller will allow you to use any 24VAC thermostat. SmartZone controls are designed to be universally compatible with 24VAC thermostats including WI-FI models used to control your thermostat remotely through the internet on your smart phone or tablet. You should be able to connect any 24VAC thermostat to a SmartZone control without any problems.

Do you have a digital thermostat that you recommend or sell to go with SmartZone?
From ecobee.com

From ecobee.com

ANSWER: ZoningSupply does not carry thermostats, however, SmartZone controllers are compatible with any 24VAC powered 5 or 6 wire thermostat. Popular brands our customers install with SmartZone include Honeywell, ICM, Braeburn, Nest, Ecobee, Aprilaire, Lux, Lyric,  and MANY others. We suggest you avoid using low priced 'power stealing' thermostats as they may cause intermittent issues if your utility power fluctuates. Power stealing thermostats are typically low priced and can be identified by the lack of a C (common) terminal on the thermostat wall mounting plate.
If you are looking for a WiFi thermostat check out this other article:


from 99.00
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Air balancing information & IOT evaluation from ContractingBusiness

Other HVAC, HVAC Contractorszoning supplyComment

Good articles that can affect HVAC zone control

If your technicians aren’t checking system airflow on every service call, you’re doing your company and your customers a disservice. Air balancing is the missing link in getting residential HVAC systems to perform at or near their peak levels.
— ContractingBusiness.com

Photo by scyther5/iStock / Getty Images
It is easy to be confused when it comes to the Internet of Things (IoT), with so many products and objects being connected and made more intelligent. It sounds overly complex, but one application that is easy to understand is HVAC IoT.

HVAC IoT is made up of a system of smart thermostats placed throughout building zones. The devices, and therefore the zones, are connected over wireless and software and work together as one brain. The brain has a nervous system with sensor endings in every room, hallway or lobby to monitor any environmental changes that could prompt the HVAC system to react
— ContractingBusiness.com


Support, homeownerszoning supplyComment

QUESTION: Will SmartZone replace Honeywell Trol-a-temp?

ANSWER: The SmartZone-4X is a "drop-in" replacement for all of the Honeywell boards.

Photo by spates/iStock / Getty Images

QUESTION: I live in Toronto, Ontario, Canada. Are there any qualified installers for the Smart Zone dampers?

ANSWER: Although we have customers in other parts of Canada, we do not have any specific HVAC contractor customers in Toronto. Any reputable HVAC contractor with previous experience installing zoning should be able to install the Ecojay SmartZone controls or dampers. Many do-it-yourself folks have also successfully installed Ecojay's controls/dampers without difficulty. If your contractor is not specifically familiar with SmartZone controls they can reach our technical support line, 844-ZONE-123, for assistance if needed. Feel free to contact us with additional questions.

QUESTION: I have an old DuroZone system (model SMZ-SW) that has stopped working and am looking for a replacement solution and have been researching the Smartzone option.  I have a few questions and wanted to see if you could help me.

  1. I'm not sure what has failed with the DuroZone system, but I wanted to first see if I replaced the controller with the Smartzone controller if it would work.  Will the Smartzone controller work with the DuroZone dampers ?
  2. Would you be able to put me in touch with an installer who could do the installation and testing of the smartzone controller ?  I'm not overly handy and would prefer a knowledgeable installer to do the install and tests.


  1. Ecojay's SmartZone products are compatible with your current DuroZone controller.  Your existing thermostats and dampers are normally compatible with SmartZone.as well. Wiring the dampers into SmartZone may be different depending on the model dampers you have. We can provide damper wiring instructions when you or your installer inform us the damper models you have. 
  2. The change out of your existing Durozone controller should be simple for any competent hvac contractor even if they haven't used Smartzone before.  Zoning Supply can also be contacted for technical support toll free if you or the installer need technical assistance. 

QUESTION: I have a Honeywell Chronotherm 111 system with one main panel and three mercury thermostat controllers. I have been informed that my control panel is inoperative and three dampers have failed. I would like to upgrade the system with out
losing the capability/control of the temperature in each room. I am in dire need to correct/improve my system with the Honeywell product.

ANSWER: The Honeywell Chronotherm III thermostat (models T8600, T8601 & T8603) are 24VAC powered according to Honeywell's spec sheet and should be compatible with any Ecojay SmartZone controller.

QUESTION: My customer has a Carrier/Parker zone system, not sure what version. I want to replace the complete system minus the dampers. Currently there is a main controller, bypass controller and six zones. The bypass could be converted to a dump zone. Wireless is also an option. What do you think?

ANSWER:  From our knowledge of the Carrier-Parker controls, it is VVT control system  and Carrier released two generations of the product line that we know of.  One or both generations used dampers that had DC powered, multi-position actuators. Carrier has also tended to use a more proprietary control flow using a pulsed or multi-position damper actuator which do not have an internal stop switch.  SmartZone outputs 24VAC continuously on either the OPEN damper circuit or CLOSE damper circuit with the actuator using an internal stop switch to switch off power when it reaches stop in either open or close position. This is typical of most conventional residential/light commercial zone control brands and product-lines today. If your customer's current system does not match this specification you will need to change out the damper actuators if installing Ecojay SmartZone or any other major 24VAC brand control product. Ecojay's damper actuators have a torque rating of 18 in-lb/2 Nm and can work with a round or square shaft of 1/4" to 5/8" diameter.
SmartZone is expandable up to 20 zones, capable of 2C/3H stages and is compatible with any conventional 24VAC controlled equipment including heat pump or heat pump with dual fuel. SmartZone is also compatible with all off the shelf 24VAC thermostats. If you are able to supply the specific product model your customer is using I can probably be more specific about the compatibility issues.

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QUESTION: I have a Honeywell Trol-a-temp Model MABS-2 422041-2 with a Mastertrol Add-a-zone model MAZ-1 TAT422027. This is a 4 zone electric system, heat pump with Emergency heat. I have the Master which control s the Emergency heat plus e thermostats. I would like to upgrade the Panel so that I can put a digital thermostat as the master.

ANSWER: SmartZone-4X will work for you.

QUESTION: I am looking to use this product with a 2 zone system that has 2 wire dampers. I have to power 4 dampers per zone. Will this produced do so? I am using 8" round dampers and there are 4 per floor.

ANSWER: All Ecojay SmartZone controls are compatible with 2 and 3 wire dampers. They can even be mixed on the same zone. SmartZone can support up to four 2 wire dampers (up to ten 3 wire dampers) on each zone.  Dampers and thermostats are powered from the SmartZone controller. It is important to determine the VA capacity of the transformer needed to power SmartZone as the number of devices powered from the controller increase. In your installation, the transformer used to power the SmartZone controller will need to support the power demand of the zone controller (12VA), 8 dampers (2-wire dampers at 7-10VA each), and 2 thermostats (2VA each). Total potential transformer VA demand from these components collectively total 96VA (12+80+4). However, assuming your 2 wire dampers are power close/spring open, power demand from the dampers will occur only when the dampers are closed. With a 2 zone system, you will never see both zones closed at the same time (all dampers default to open when no zones are calling) so your maximum power demand will be only from 4 dampers. This changes the maximum potential power demand to 62VA (12+40+4). A 75VA - 24VAC transformer will be capable of providing adequate power for your system. This size transformer is readily available on Ebay and many other web stores.  If your 2 wire dampers are power open/spring close (this type is typically used only for fresh air ventilation) then you will need a transformer with a VA capacity of 100VA minimum.  Visit our zoningsupply.com website and review the ZS2X/4X installation guide for more information on installation. Thank you for contacting Zoning Supply with your question. We appreciate your interest in our SmartZone products.

QUESTION: The 9580 thermostat uses delta T (difference between actual room and called for temps) as part of the staging calculation.  If the staging function of the thermostat is replaced by the zone controller, how does the controller get delta T, or is is not used?  If not, ow does it determine staging...is it rate of temp change sensed by the probe?

ANSWER: SmartZone uses algorithms based on time and supply air temperature (as measured at the supply air plenum) to control staging. Each time the equipment is started SmartZone will require a minimum run time in stage 1 before it will consider staging. This initial run time allows for the equipment to achieve a stable temperature in heat or cool before determining if staging up is necessary. After the initial run time requirement is achieved SmartZone compares supply air temperature to the cut-in temperature settings and will stage up if conditions are met. When the equipment is running stage 2 SmartZone will compare supply air temperature to the cut-out temperature and will return to stage 1 if conditions are met. SmartZone staging algorithms will vary the time and temperature elements based on equipment type (gas/electric or heat pump) and mode of operation (cool or heat). The SmartZone Installation manual included with your product provides detailed information about the sequence of operations for adjusting staging settings including the specific algorithms used for each equipment type and their modes of operation.