View Full Version : New Goodman GMVC95 installed, need t-stat
02-10-2011, 08:36 PM
Hi group, I just had a new Goodman GMVC95 furnace installed and plan on having the corresponding AC unit installed this summer. The contractor left my thermostat (it's a digital but only a single stage) so I'm not getting the benefits from the furnace so I want to change it and I love the look of the Prestige IAQ THX9421R5005. On the Honeywell site it says it must be used with the THM5421R1005 Equipment. Will this stat work with my Goodman by itself or do I need that equipment module? Or is that module only if I want to use the Redlink capabilities? Thanks guy's.
02-10-2011, 08:58 PM
the goodman furnace will work with a 2stage or a single stage thermstat. with a single stage thermostat it is a time out transition from low to high heat.
02-11-2011, 08:34 AM
The Goodman ComfortNet control is another option to look at if the AC unit you plan to add is also communicating. In this case it unlocks some functionality that traditional tstats can't provide since the system is now networked.
02-11-2011, 09:37 AM
Thanks guy's. It hasn't really been a very nice home comforting experience having this installed. I did a lot of research and for the house and location and price points and all things considered the GMVC95 seemed like the way to go. Now I'm not bashing the furnace at all but my beat old mid heated up my house a lot better than this one does but I think it's the thermostat. The heat coming out of it is noticeably hotter but the amount is not. It's like the furnace is stuck on low and never kicks up. Here's a scenario...the stat is set to drop to 65 at 11PM and raise to 70 at 6AM. Usually by the time I leave for work at 7 it's reached 69, that was with my old furnace. With this one I rarely hit 67.5 - 67 by the time I leave for work. So the same time frame but less heat. I think it's the t-stat. I have a cheap digital that is neither communicating or multistage. Now from what I read and even the first response here the furnace is supposed to kick up to a higher speed no? Could my t-stat be preventing that? I don't want to call in the same guy's cause if they didn't do it right the first time what makes me think they'll do it right this time. I know they had no expeience with this furnace because I asked them and the response was "they're all the same" and I think they were a bit put out when I asked if they wanted the directions that came with it. Anyways, back to my original question/thought. I seriously love the look of the Prestige IAQ line of t-stats much better than the Comfortnet which was my first choice for obvious compatability reasons but I won't get the same results with the Prestige? Oh and again back to the original question, can I use just the THX9421R5005 as a standalone stat..without the module? Also I live in Ontario Canada where it is 0 degrees F..as I type this. Brrr!
Gunnery Sergeant Hartman
02-11-2011, 10:06 AM
Why not let the installing contractor correct the situation? They should be able to get help from the distributor they purchased the furnace from if they are not familiar with the furnace.
They can get the thermostat you request at that time and install it while visiting your job...
02-11-2011, 10:15 AM
There are dipswitches on the control board which have to be properly set for operation with either a single stage or two-stage non-communicating thermostat. There is also an option for stage delay which is set by dipswitch. Further there are dips to setup correct airflows for heating and cooling....so all of this could be coming into play for you.
The ComfortNet control bypasses all of these "legacy" dipswitch settings and autoconfigures the system based on the indoor and outdoor units telling the tstat their capacities, etc. The installer can then utilize special menus in the Tstat to refine the auto values for best performance, for example trimming airflow.
Beyond that the ComfortNet control enables system wide data sharing and fault reporting including call for service alerts at the tstat.
You should be able to have your installer double check the dips for now, and again the ComfortNet is an option when the complete system is in place.
big sky hvac
02-11-2011, 11:20 AM
What thermostat you use really depends on how much money you're willing to spend. If there are enough wires in the wall, a Focus Pro 6000 2-stage will work fine. The advantage of the Prestige IAQ is that it will control a humidifier as well. Another option would be the Vision Pro IAQ. It will provide the same functions as the Prestige, but it does not have the capability to have the remote control. The Vision Pro is considerably cheaper than the Prestige as well. And to answer your question, yes you do need the module for the Prestige IAQ or the Vision Pro IAQ. These are communicating thermostats that only require 2 or 3 wires that connect from the thermostat to the module. Then the module is wired to your equipment.
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