ADC t3000 and vent setup on terminal Z2

@jwcsurety relay that I always use on all my hvac jobs and my house are Functional Devices RIBM24C. most basic and reliable relay I ever used through my 15 year havc experience. I’m attaching general picture of relay so you do’t have to wait until i get home. will attache actual one when i get home if you want me to.

Thermostat detect z2 terminal just fine so I don’t believe that we are dealing with voltage issue. Its just a basic dry contact on the thermostat. Other accessories work just fine that are all using same relays. I really think we have software issue or simply coding issue in algorithm and thermostat setting acceptance. But I may be wrong.

Before you ask, Yes I already try different relay just to make sure. same brand and model.

shopping

I’m attaching general picture of relay so you do’t have to wait until i get home. will attache actual one when i get home if you want me to.

Thank you, yes I meant the one you have installed with wiring.

I’m not questioning the quality of the relay, just in circumstances like this with a strange issue occurring we need to make sure to go over every potential.

Discussing this issue with ADC this afternoon. Hoping to get solid clarification on the limitations the support reps suggested and get to the likely cause

no problem will send you picture when i get home. @jwcsurety at this point I don’t think is a question of limitations is just not doing anything it should and maybe ADC should step up and just fix it.

@jwcsurety here are some pictures you can see three relays under my zoning board. The first one is for VENT, the second one is for Humidifier and the third one is dehumidifier control all go to the same thermostat.

I spend some time in front of the unit tody doing some work in my basement and notice that we do have a sequence. it turns on every hour for about 4min total with the settings that were recommended from ADC. With still doesn’t make any sense because it should run for 15min and be off for 45min.

edit: I did something else. I went back and change duty cycle to 100% . Can you guess how long it run for 4min.

edit2: I think override lock out has a lot more to do with this whole thing that ADC is telling us or what “?” mark explain. But if we go by “?” then non of vent options are correctly working. Anyways I did change from 2hr to 1hr with duty cycle set to 100% still at 1hr ventilation period and unit never turn on.

Are you using the Circulate option? It is similarly set using a Duty Cycle.

Does the fan circulation run as expected?

Only on one of my zones, my basement thermostat its set to 50% duty cycle and it works fine.

Just to clarify, it looks like you have two Tstats with Vent settings. Do you have two EV300s or just one system?

Also ADC is asking if you have any of the accessory sensors available for the EV300. There are some occupancy and other sensors that can be used for overrides.

Jason, I just check that was when I was switching thermostat to make sure that both have same problems. only 1st floor thermostat should have vent set up. I already removed from 2nd floor. Sorry my mistake.

Aha, great thank you for confirming. Do you have any of the accessory sensors for the EV300?

no accessories that would go in place of the thermostat then.

@jwcsurety have you got anything from ADC?

They are still looking t this and testing. The HVAC specialists have the latest info regarding the Thermostat controlling the EV300. I’m waiting on further info.

@jason I give you wrong model number but it the same as ev300. Sorry it’s actually call EV premium L. just so you know EV premium L has dry contact control that is it. Pretty much just like controlling humidifier. Nothing special.

Can you confirm which wire in the image above of the relay comes from the tstat? I believe they are going to ask.

(logically, the wiring is obvious, but they’ll want to confirm and rule out simple problems)

Identifying all the wires at the relay will help

@jwcsurety ok, I’m driving now when I arrive at my destination, I will draw out expect diagram and explain all wires. I will take a picture and attach here.

thanks for posting this question. I’m considering replacing my thermostat, but there aren’t many out there that support HRV/ERVs. I like the idea of integrating the thermostat with my security/automation system but im hesitant after reading this post.

Currently I have an Trane XL-824 Thermostat and it runs:

-2 stage furnace
-2 stage central a/c
-humidifier (only on during heat mode)
-HRV

My HRV has the option to have its own controller (which gives more options like variable fan options) but now since its controlled by the thermostat, its just on or off and its on the highest HRV fan speed setting. The HRV has a defrost mode which is controlled by the HRV itself with its onboard diagnostics and when temps are below freezing. My current setup is that the HRV runs (at least) 20 minutes every hour, and runs when the furnace fan runs, all year round regardless of mode, heat or cool. It also runs when the bathroom switches are manually turned on for 20, 40 or 60 minutes but that is a separate circuit. Do you think the t3000 would be able to do the same?

My Trane thermostat works perfectly and there really is no reason for me to change it but, I do like the integration option (which I don’t have now). Perhaps i’ll just wait on this (I mean, Trane has been in the HVAC business for decades, but don’t know how long alarm.com has been in HVAC, perhaps they will get there soon).

@xeon I just look up your thermostat and being in HVAC industry looks like this is normal non communicating thermostat. What that means that is uses 24v to control your equipment and any accessories attached to it.

In that case T3000 would be great fit for you. You be able to set up your equipment as 2 stage furnace (heat) and 2 stage AC (cooling) that is how my set up is control as well. You can also set up z1 terminal to do your humidifier same way it is now.

As it comes to ERV/HRV by the manual we should be able to do that but currently there are some problems with that option as you can read through my post. I have test that on all three of my T3000 and they all doing having same problem. When/IF ADC will fix that then you be able to setup z2 terminal to do exactly of what your thermostat is doing . Currently thermostat dose not have lock out set up for extreme temperature for HRV. I did dig deeper ant those parameters are in there but ADC is not allowing those controls.

As for your bathroom fan control your thermostat can do a lot more than T3000 currently have. So with that sad without some serious z-wave setup including switches and outlet and involve rules setup in ADC automotions rules you will not have easy way to achieve that.

Hope that help answer your questions and clarify thinks a bit. I think ADC T3000 it’s a great thermostat. I had it for quite some time and beside this one problem with vent it has been great. I have that thermostat running both of my humidifier and dehumidifier without any problems.

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@jwcsurety sorry I got home late last night and forgot to post this. Here is how unit is wire. You can see from my diagram that relay is wired in the matter that will provide isolated between thermostat and ERV so there is no power issues.

This is good to hear. I will be following this post, and will decide to change to the t3000 based on your experience.

Actually the XL-824 is a very good thermostat. It’s one of the few thermostats that has Wi-Fi and Z-Wave built in. It’s part of the Nexia ecosystem of automations and security equipment, which obviously is not alarm.com.

@xeon what panel do you have? have you actually ever try to include that thermostat in to the panel and see what options do you get in ADC ?