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-   -   Please help with understanding zoned HVAC (http://www.diychatroom.com/f17/please-help-understanding-zoned-hvac-17044/)

hmhdlh 02-13-2008 05:18 PM

Please help with understanding zoned HVAC
 
I have a heat pump with two thermostats. One on the main level and one for the room over my garage. I feel like it is not working properly and just getting a run around explanation from the builder. My year warranty is running out and I want to understand very well before I speak with the builder again. During the spring/summer when we purchased the house, he told me that when the temperature upstairs became too great in comparison to the downstairs temp a fan would run to circulate the air. This seemed reasonable and the temp difference was never greater than five degrees and I was happy with this. However, during the winter the difference is 10 degrees and the room is unbearable. I feel that if I have them fix this problem, it will only be temporary and then come summer, I'll be sweltering with an expired warranty. Thanks for any help!!:(

chris75 02-13-2008 05:20 PM

I dont understand, if you have two zones with 2 t-stats, why isn't each floor at the desired setting of the t-stat?

hmhdlh 02-13-2008 07:06 PM

That's what I don't understand. It's like my thermostat upstairs does nothing.

hvac122 02-14-2008 08:25 AM

A zoned system would use a zone board and dampers installed in the ducts. Do you have a zone board of some sort near the furnace? If the system just turns on the fan to move air it is not zoned and will more than likely not work as you desire. More info is needed. Look closely at your duct and let us know what you have if possible.

hmhdlh 02-14-2008 09:03 AM

It may very well not be zoned. I've contacted the builder and am waiting for him to call me back. There was a specific name that he used for the system which I do not recall. I will also take a look at the system myself. If it is not zoned, what is really the point of the second thermostat?

hvac122 02-14-2008 09:38 AM

Until we get more info it is hard to say what the second stat is controlling. Let us know what you find out.

chris75 02-14-2008 04:47 PM

I dont know what you have but I bet your 2nd floor t-stat only turns the blower on, but look at hour Air Handler and you should see a zone panel to see if they actually installed two zones......

handyman78 02-14-2008 05:24 PM

This could be wired like a relative's house with hot water baseboards and 3 zones. Only the main living room stat controls the heater turning on and one zone, the others control the zone valves to let heat in the other areas of the house. The other 2 stats only control the zone valves- not the heater so if the main is set low and the others high, the heat will not go on but the valves will be open when it does.

chris75 02-14-2008 05:26 PM

Quote:

Originally Posted by handyman78 (Post 98015)
This could be wired like a relative's house with hot water baseboards and 3 zones. Only the main living room stat controls the heater turning on and one zone, the others control the zone valves to let heat in the other areas of the house. The other 2 stats only control the zone valves- not the heater so if the main is set low and the others high, the heat will not go on but the valves will be open when it does.

Why would you even pay someone for this type of setup?

unsweetenedtooth 02-14-2008 05:47 PM

no one asked if it was forced air (with blower) or a boiler?

chris75 02-14-2008 05:48 PM

Quote:

Originally Posted by unsweetenedtooth (Post 98027)
no one asked if it was forced air (with blower) or a boiler?

Said it was a heat pump, so i'm assuming there is also an air handler... :)

unsweetenedtooth 02-14-2008 05:51 PM

maybe shes not putting enough wood in the stove! lol

handyman78 02-15-2008 09:08 AM

Quote:

Originally Posted by chris75 (Post 98018)
Why would you even pay someone for this type of setup?

We didn't specifically- it was in the house when it was bought many years ago. It is a shore house so it didn't seem to matter as much.


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