Carrier ICS with Honeywell AQ2000 Aquatrol?

[DavidNJ]

The Carrier has a hydronic heat setting and can work with a non-ICS 2-stage furnace. The AQ2000 (http://customer.honeywell.com/honeywell/ProductInfo.aspx/AQ25142B)has mod boiler and DHW control for 4 stage or 2 2-stage thermostats (expandable).

If the house has two Carrier ICS air handlers with hydronic coils, would that work with the AQ2000 (which is pretty cheap) to control it across both air handlers? With the mod-con boiler (which can use its own outdoor reset or use one in the AQ2000) would the outdoor reset effectively create modulation?

Did Carrier implement a dehumidification reset for its ICS air handler that could work for this?

[skippedover]

Question? With all the posts you have and all the technical questions you ask, why are you not a pro member? Many of the questions, like this one, would get much better response on the pro side.

In year 2012, all hydronic boilers in the country will need to have some sort of reset or energy manager control. This is the same logic that's been used on the System 2000 since 1978 or so. It's taken the manufacturer, Energy Kinetics, fighting an up hill battle against the DOE about AFUE versus actual system efficiencies. The DOE finally admitted that the AFUE has little to do with actual system efficiency. So now the requirement is to fall in line with what EK has said for decades. That is, that with a high AFUE rating, the next step is the way the hot water in the system is used; how much hot water is left in the boiler at the end of the heat cycle.

If there's more than one air handler in the home, then there's a t-stat for each air handler. The operation of the Honeywell control is to keep the last zone calling for heat open after the t-stat reaches set-point. This will serve to reduce the boiler water temperature without substantially overheating the room(s). This could lead to cool/cold air complaints from the occupants. Reset is another issue. Hydro-air is an unlikely candidate for any type of reset control as commonly designed. An oversized hydro-air coil with a variable speed drive blower could take some advantage of reset but only down to about 140F. If the boiler in the home is a condensing boiler then use the outdoor reset that's made for it. You'll have to run a water temperature and circulator gpm flow rate that will deliver the right temperature to the coils. A better solution would be to put in a variable speed circulator for each circuit that will deliver the right gpm based on coil water temperature Delta 'T'.

[DavidNJ]

Question? With all the posts you have and all the technical questions you ask, why are you not a pro member? Many of the questions, like this one, would get much better response on the pro side.

Don't you have to be an HVAC professional for that? Although I have a few HVAC product concepts I'm exploring, my official position is still homeowner. Did have an interesting discussion at a picnic today with someone who is developing a magnetic refrigeration unit (no refrigerant).



In year 2012, all hydronic boilers in the country will need to have some sort of reset or energy manager control. This is the same logic that's been used on the System 2000 since 1978 or so. It's taken the manufacturer, Energy Kinetics, fighting an up hill battle against the DOE about AFUE versus actual system efficiencies. The DOE finally admitted that the AFUE has little to do with actual system efficiency. So now the requirement is to fall in line with what EK has said for decades. That is, that with a high AFUE rating, the next step is the way the hot water in the system is used; how much hot water is left in the boiler at the end of the heat cycle.


I've seen the Energy Kinetics website and have always been amazed at the lack of substantive information there. Their own chart shows their system roughly the same as a mod-con boiler, although their system may have some more advanced overall system electronics built in. That their generic mod-con was so close by there own measurement, added to the obscure way they describe their own system, raised nearly every red flag I know of.


If there's more than one air handler in the home, then there's a t-stat for each air handler. The operation of the Honeywell control is to keep the last zone calling for heat open after the t-stat reaches set-point. This will serve to reduce the boiler water temperature without substantially overheating the room(s). This could lead to cool/cold air complaints from the occupants. Reset is another issue. Hydro-air is an unlikely candidate for any type of reset control as commonly designed. An oversized hydro-air coil with a variable speed drive blower could take some advantage of reset but only down to about 140F. If the boiler in the home is a condensing boiler then use the outdoor reset that's made for it. You'll have to run a water temperature and circulator gpm flow rate that will deliver the right temperature to the coils. A better solution would be to put in a variable speed circulator for each circuit that will deliver the right gpm based on coil water temperature Delta 'T'.

Are you saying that hot water coils are not compatible with mod-con boilers with an outdoor reset?

Would a T775 monitor LWT-EWT at the coil and adjust the circulation pump and mixing valve to maintain EWT and delta T?

Wouldn't the outdoor reset on the mod-con boiler act as a form of modulation increasing cycle times?

It would be nice if there was on device that could take the thermostat inputs and manage the boiler, mixing valves, circulation pumps, and control valves for multiple zones.