| Hi Jarredsdad, thanks for taking the time to post. ( My pro comment wasn't directed at anyone here ( or anyone for that matter, just a little frustration on my part), I've asked this same question on few other boards and the usual is that's it's too complicated for me to understand :-) and I should have used a pro in the first place, even though I've had 3 different pro's in house already)
Well let's see
My settings are:
170 = 7
200 = 1
250 = 5
350/360 not available on my T'stat in it's current configuration.( I would think that's because there's no outdoor temp sensor)
The Defrost board in the HP should be taking care of those settings ?
I understand the T'stat calling for Aux heat but that output ( W1) is wired directly to the HP not the Furnace so logically it would be the Defrost board that is controlling/allowing both the HP and the furnace to run at the same time ? It indicates in the install manual that this is not supposed to happen without a bonnet sensor installed. ( I see no sensor anywhere on the output of the furnace/coil and there's definitely nothing wired to BS/BSG in the HP) )
The way it's currently wired, it sure appears that the York defrost board controls everything. It decides when to run the HP/furnace, ( when the T'stat asks for it) what speed the furnace runs at ( hot heat pump mode-- dependent on outside temp /line temp) etc.
W2 is connected only between the furnace and the HP so the HP seems to controlling when the furnace upstages as the upstage timer is disabled in the Furnace as per the HP install instructions.
Tonight I witnessed a defrost cycle ( at least I think it was def cycle)the lineset went cold and the furnace came ( for few minutes) on to offset the cold coil. The HP Fan shut off , there was a sucking sound and it went back to heating.
This is different from the dual heating events I have witnessed where the coil was being fed with hot refrigerant at the same time the furnace was running. Overall the system seems to function correctly for all other conditions, which has me puzzled.
I hope this doesn't come across as a rant or similar, I love my HP/Furnace and I find diagnosing fixing faults quite interesting.
I can't wait to install the IAQ and see what trouble I can get into ( I'm kidding of course)
Sorry if I posted this in the wrong section, I thought it was more of system problem as opposed to just a T'stat issue.
Cheers
Gary  |