ibjammin

the HW VP IAQ should not be installed by a novice.

Installing dealer should be called back and hopefully have a tech familiar with this stat.

wiring should be doublechecked. if you plan on using the "dehumidify on demand" feature which is the major reason for going with the IAQ, then air handler dip switch settings should be checked and "Comfort R" needs to be disabled.

you do have an outdoor sensor? I would disable backup heat strips at 32 deg and above assuming you plan on programming for setback/recovery.

unless you have a comfort level with this stat, leave your problem with the dealer. it is his responsibility foir correct operation. you do have your owner operating manual?

I am sure you are frustrated as I would be. Sorry for the problem.

TD

Right, I shut off Comfort R assuming they even know what it is :( On a Trane, DOD is easy to wire in. Gotta be turned on in the advanced setup, 379 I think. Tell him to call the 800 number for Honeywell if he can't do it on his own.

Hey Loonie,

What if the HW VP IAQ TH9421 is used with HW HZ221(or HZ432) TrueZone panel, can the "Dehumidify On Demand" feature still be used with zoning?

Thanks,

-Dan

You said DOD has to be wired in. Exactly how do you wire it in for it to work? You also said it has to be turned on in advanced setup. I guess you are talking about advanced functions at the IAQ stat. But I can not get 370 or 379 to come up in advanced functions. It skips right over it and goes to a higher number. Please help.

ibjammin, I find the Installation Manual on Honeywell's site, it might help you, it does say 379 in the Installation Manual. I think you will have to press SYSTEM and hold for 5 seconds to get to the setup menu. On the operation manual it skips over it to the advanced menu: https://customer.honeywell.com/honeywell/ProductInfo.aspx/TH9421C1004

I don't mean to hijack the thread but since my question is related to the stat, I put it here so that people read this all can benifit.

I guess I am confused - what does EIM THM5421 do? Do it has to be used together with TH9421 to make all the features in TH9421 work? What if you use only TH9421 but not THM5421?

In turn of using it in a zoning environment, do you use TH9421 with only W8835 (network zoning panel) instead of all of TH9421+W8835+THM5421? If I have 2 zones, do I have to use 2 TH9421 with the both zones or 1 TH9421 + 1 lesser stat like TH5320 for lesser important zone?

Lastly, what's the difference to use TH9421+THM5421+HZ432 (TrueZHONE) vs TH9421+W8835 (Network zone)?

Thanks,

-dan

this is a fine example of finding the right contractor first and the cheap price that was offered to you correlates into this installers service and knowledge.

I would have recommended the Bryant 225ANA or the Carrier 25HCB5 with the FV air handler and edge thermostat this way there is no worries about humidity control or dip switches
There is a reason why I prefer bryant over trane. It's in the controls.

recommended dip switches settings for your set up
on-off-off-off-off-off-on-off

I guess I am confused - what does EIM THM5421 do? Do it has to be used together with TH9421 to make all the features in TH9421 work? What if you use only TH9421 but not THM5421?

In turn of using it in a zoning environment, do you use TH9421 with only W8835 (network zoning panel) instead of all of TH9421+W8835+THM5421? If I have 2 zones, do I have to use 2 TH9421 with the both zones or 1 TH9421 + 1 lesser stat like TH5320 for lesser important zone?

Lastly, what's the difference to use TH9421+THM5421+HZ432 (TrueZHONE) vs TH9421+W8835 (Network zone)?

Thanks,

-dan

Dan,
To make this simple, I would recommend the W8835 zone control board with the TH9421 for the thermostats.
The W8835 is the interface module with added zone control feature. There is no need for the THM5421 interface

I will say do not skimp out on zone control, a cheap zone system is scary and can give massive headaches.

The true zone is a cheaper version, I have had to correct others who attempted to install this product and I was not impressed.

I will also note for others who may be thinking about a new A/C system and zoning. Bryant Evolution or Carrier Infinity zone systems are far superior. I just finished another evolution zone system yesterday and it impresses me every time.

classicdave is right on target with his comments above.

Trane has solid equipment. But controls/stats have been and still are a very weak area in their product line. It is really pathetic that they have to depend on third party stats especially since they have a long partnership with Honeywell. Many of their so called "comfort specialist" techs can't even set the dip switches correctly. Not to mention install the HW VP IAQ.

Carrier/Bryant offer the nice Edge thermidistat. You never read problems about this stat. Why can't Trane?

And as most will agree, the Infinity/Evolution controllers are simply the best on the residential market. And what does Trane offer? humm. I can't believe they can't get their act together. Companies that rest on their reputation will have a questionable future.

it really should not be necessary for OP to figure this problem out for himself.

TD

Dave, Tiger, thanks for the comments.

If I use TH9421 and W8835 setup for the main zone on the second floor, do I have to use another TH9421 for second zone on 3rd floor finished attic? Or something like TH5320 will just do fine?

I posted a message here a while on the Trane or Bryant. To use Bryant was fully on my mind. I had a Bryant guy came to estimate it, he took my drawing on the room/windows and said he would get back with me but he never did! I called the office, they said to have him call me back but again, they never did. Very odd.

I decided to go with Trane 3 ton 410a XL15i heat pump (model # 4TWX5036A1), matching 4TEE variable speed air handler (model # 4TEE3F40B1) with 8KW heat strips, Honeywell IAQ series TH9421 stats but the contractor just specified "Honeywell zoning panel". That's why I come here again ask for help to see what exactly I need. I will insist on W8835. They probably will increase the price but I am expecting only little since I don't need the THM5421 anymore, also if I can use a TH5320 instead of a second TH9421.

Again, thanks.

Dan,
the W8835 zone is a communicating zone system. It will use 1-2-3 terminals on the IAQ thermostat. The TH5320 does not have this communication feature. So you will need the IAQ TH9421
do not go cheap on zone control. I've been and done it for years and it's my specialty.
I lost a job today because a long time customer went cheap, and was compulsive!!
This customer is going to have 10yrs of hell until he smashes it with a hammer or rips it out but life goes because tomorrow I will be setting up a perfect zone control system for an educated customer.

who knows my long time compulsive customer may show up here in a week asking how to fix a problem with his new install.

Sorry to hear that Dave.

Well they say customers come from all different shapes and colors ;-)

I really appreciate your advice and will follow up to instsit W8835.

It's not that I went with this installer just because his price was so much cheaper. From information I have gained through this forum, Trane equipment is very good and I felt confident that it would do a good job and last a long time. I have confidence in the installer as I have known him for a good while and knew he did quality work. It's just that he had not ever installed a HW Vision Pro IAQ stat before. I figured with help from you guys that have installed Trane units along with the IAQ stat that I could get some help that would help him in getting it set correctly such as how to wire the EIM to the Air Handler correctly as far as what colors should go where and what the dip switches should be set at to benefit from the Dehumidify on Demand feature it offers.

ibj,
I feel for you,
to be honest if your friend sells trane, he has got to know about the dip switches, plus he has to know about IAQ thermostats, It trane and HW IAQ for pete sake it's like bread and butter.

There is nothing wrong with trane I sold/installed them for 10 yrs I know the systems very well. I also know that there are guys who sell trane that will under cut the price then leave the customer hanging and of course the customer comes here for advice when we just got through mentioning find the right install contractor.

I can give the advice but you need to have your friend look this stuff up and fix it for you. You paid him, remember you didn't pay us. And I just lost a job because of a guy like your friend who undercut me and I know for a fact this long time customer of mine is in for a rude awaking because he went with a larger system and is not going to correct his zoning. But Things happen for a reason. His job loss turned into 4 other leads today.

For your friend
Just have him buy the IAQ stat and read the instructions it's all there and then he will know the setup for you and for the future next customer.
Remember it's his job to know or to find out how and that is why you paid him.

keep us up to date and if he doesn't pull through I will be glad to go through the IAQ thermostat with you.

Not to hijack the thread but I'm having similar issues with setting up the HW VP IAQ to DOD with my Trane systems. I've pretty much given up on my contractor to set it up correctly. They've never used the HW VP IAQ and are at a loss. They've called Honeywell and Trane and still aren't sure of the setup.

The home and equipment are new and I would just like to ensure that the IAQ and my air handlers are wired and set up correctly for the most efficient operation.

I've attached photographs of the IAQ EIM, air handler connections, and dip switch settings for my main floor and basement unit. The heat pumps are Trane XL 15i's. The main floor also uses a Trane ERV 300 and an outdoor temperature sensor that I believe are wired correctly. Any advice is appreciated.

Main floor
{{gwi:1595316}}
{{gwi:1595317}}
{{gwi:1595318}}
{{gwi:1595319}}

Basement system
{{gwi:1595320}}
{{gwi:1595322}}
{{gwi:1595324}}
{{gwi:1595326}}

bump

fish,
What is the size of your system?
the dips are set at 5 tons with the first and 2 ton at the second for normal 400 cfm per ton.

The 5 ton is not wired for IAQ humidity control and dip 5 and 6 are set for Comfort R.
If you want to use IAQ humidity Control then shut off dip 5
remove the jumper plate from terminal R and BK in the air handler. Run wire from BK to DHM2
Set 370 and 379 to 1 in IAQ set up.

Next dip switch to look at is IF your system is 5 tons, then I would recommend turning dip 7 and 8 to off for 1600cfm Aux Heat.

2 ton system
turn off Dip 5 to disable comfort R
check to see if 370 and 390 are set to 1

Dip 8 should also be set to ON so that 600cfm are used in Aux Heat mode.

ib,
dips on-off-off-off-off-off-on-off

Wireing
just like instructed above and setting 370 and 379 to 1

I'm on vacation and it's now 6am.
Trane and Honeywell owe me big time, but they don't care, boo~

if anyone would like make a comment on my site about the help I give it would be very nice return gesture to me.

Here is a link that might be useful: ClassicDaves Comment Section

Thanks for the help Dave especially since your vacationing.

The main floor unit is a 3.5 ton with a 15 kw aux heat strip.

The basement unit is 2 tons with a 10kw aux heat unit. (The contract stated the aux heat was an 8KW but the installer said it's a 10KW unit).

On the main unit I removed the jumper from R to BK and wired BK to DHM2 as suggested.

The HVAC contractor was out and has now removed all connnections to W3 and has jumpered W1 and W2 together. Aux1 on the EIM is wired to W1 and Aux2 is wired to W2 then jumpered together. Is this proper?

370 and 379 are now set to 1.

Since the main unit is a 3.5 ton, what are your suggested dip switch settings?

Basement settings should be on-off-off-off-off-off-on-on ?

Thanks again.

for a 3.5 ton system and it is also very important to know the kw of heat for proper setup so this changes things on both systems.

dip switches should be for a 3.5 ton with 15kw heat, needs Minimum Air flow in heat has to be set for 1600cfm
off-on-off-off-off-off-off-off

2 ton with 10kw Aux heat minimum air flow for heat needs to be set at 900cfm.
on-on-off-off-off-off-off-on

wireing heat
This can be tricky, and I can't give you exact with out looking at the system and the electric heat. The way you described as it is set now it is not staged.

I would try
W1 to Aux 1
W2 Jumped W3 to Aux 2
Then run the IAQ through the Testing by going in test mode and having my amp prob on L1 of heaters.

Thanks Dave.