[starbuck83]

Hi,
I'm hoping one the pro's can provide a little insight into a couple of questions regarding my setup.
Current T'stat is VisionPro (TH8320) t'stat No outdoor sensor)
York YZB HP (Hot heatpump mode is enabled and working)
York PV8 2 stage variable speed NG furnace

It's wired according to York's diagram ( doc number 036-33182-002-A-1007) ( which has the HP defrost board as "master" for lack of better word)

Problem : I have noticed that under certain conditions the HP AND the furnace run at the same time ?? If the system is heating ( hot heat pump mode is active ie. blower running on low speed) and I increase the T'stat temp 1deg C the Furnace turns on and they are both running at the same time. (The T'stat activates Auxheat) . This seems counter intuitive ? They should not run at the same time ?? The coolant piping at coil gets very hot during these episodes ( not surprising as the coil is being feed by two heat sources)so I can't imagine that this is the way it's supposed to operate ? ( For example it's 5degC out side and T'stat set point was 20C ( indoor was 19.5C )when I bumped set point up to 21C. Compressor running and the T'stat turns on Auxheat so they are both running at the same time. Shouldn't the Defrost board prevent this ? ( That's how the York guy explained it's operation )

I'm about to replace the VisionPro T'stat with a VisioProIAQ ( because I can't stand the damn clicking of the relays :-) and I've read that it would be better to have the IAQ control the system as opposed to the York Defrost board ??
Is this correct, and if so, how should the wiring be changed to accommodate this ? I take it I would need an outdoor sensor to start , but how to connect the HP to the furnace and EIModule to keep Hot heatpump mode and two stage Furnace operation ? Ie if the Defrost board controls Hot Heat pump mode won't putting the IAQ "in control" stop this from working ? Obviously I'm missing some thing... but hey that's why I'm here :-) ( Please be gentle)

A little back ground, ... my neighbor is a commercial HVAC guy who put the system in for me. ( that was a big mistake.... After he asked ME what Hot heat pump mode was I decided end his involvement in the project) I then had to pay an Electrician to bring the install up to code. Then pay a York installer to fix the furnace install (gas piping , low V wiring etc) Needless to say I can't afford $130/hr for him to work on a system he didn't seem to familar with.

I just need a little info so I can do this correctly and have the system function to it's full capabilites

Thanks

Gary