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Re: Fireplace Had It's Own Air Handler Unit
Interestingly, there are controls available for the HVAC system that could be used to prevent the issues that Bob talked about under these circumstances. These monitor things such as outlet temperature from the furnace or evaporator and will turn off the burners or condenser units when the outlet air reaches critical temperatures.
Of course, the fireplace contractor who set up the system Nick described probably did not installed any ancillary controls of this type. These kinds of controls are used to prevent problems when there are several duct zones controlled by multiple thermostats. Under circumstances when only one small zone might be in operation off of a larger system, the temperature drops (cooling) and rises (heating) can easily get beyond acceptable ranges.
The fireplace contractor would definitely need to be working with a qualified licensed HVAC contractor in order to make a setup like Nick described function properly and not create other problems.
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