My old furnace (X90 120,000 BTU) finally bit the dust a few weeks ago. It was mated with a XE1000 10 SEER 4 ton outdoor unit.
New system that was just installed last week consisted of the following components:
4TWZ0048B1..........XL20i 4 ton heat pump
TUH2B080A9V4.......XV95 80,000 BTU furnace
BAY24VRPAC52DA ...Relay Panel
BAYSEN01ATEMPA...Outdoor temp sensor
I spent quite a bit of time with the sales rep from a very reputable Trane dealer discussing the pros and cons of going with the above combo vs. the fully communicating XC95m 100,000 BTU furnace, and he finally convinced me to go with the less expensive XV95 which was just as efficient as the XC95m, but lacked the communication ability, which the rest of the main components had (XL20i and XL950). Since the primary heat was going be from the heat pump, I figured that would be ok.
Well, as it turned out, on the day of the install (last Thursday/Friday), the installers had to "decommunicate" the outdoor unit since you can't have a mix of communicating and non-communicating main components. So the XL950 is wired to the relay panel using 3 wires, and the XV95 and XL20i are connected using the relay contacts, completely loosing the ability of the XL950 to discover the connected components, along with various other cool features a fully communicating system would have offered.
It really ticked me off that the sales rep stated that the XL20i would still be configured as communicating when the opposite is true.
Here are some shots of the install itself. First, here is the furnace and coil. They basically slid out the old furnace and coil and installed the new setup. They only had to add a short horizontal return extension as the new furnace and coil were a lot less wide than the units they were replacing. Notice how the furnace is even skinnier than the coil above it. The 100,000 BTU XC95m would have matched the width of the coil.
The outdoor unit. This thing is huge. Take a look at the 1.5ton carrier sitting next to it that cools the 2nd floor of my house.
And here is the relay panel. The installers ran the wires from the outside temp sensor up to the XL950 instead of connecting it directly to the relay panel? Is this considered best practice? The outdoor unit is consistently ready 7 degrees higher than the actual outdoor temp. I guess they never calibrated it?
At any rate, the morning after they left, I had the following error on the XL950:
It appears to be heat related? It went away this morning on its own. Not sure if I should be concerned about it or not?
I then noticed that the outdoor unit was running in heat pump stage 1 mode, even though the outdoor temp was 34 degrees, and it was supposed to run on LP below 40. So I went into the service menu and looked at the Lock-outs. This is the Icon I pressed:
No lockouts had been set, they were all disabled. I left them that way as I then discovered the dual fuel options as seen here:
I entered my electricity cost:
And propane cost:
I then entered my Furnace AFUE rating (95) and Heat Pump HSPF rating (9.0) and I was very surprised to see the thermostat recommend 0F as the optimal crossover point from HP to LP for heat as seen here:
So I instead manually set it to 35 degrees as seen here:
Sunday and Monday I was heating 100% with propane, but after that it began to switch between HP and LP as I would have expected as seen here:
More detailed info from Installer run history:
So overall, I guess things seems to be working now, although I need to calibrate the external sensor after making sure they did seal the hole where the wire comes through the basement wall. If they did not, that could account the higher than actual reading I suppose. But the installers appeared to have very little experience with the XL950 (and the XL20i) for that matter. I got it connected to my wifi myself, downloaded the latest software, and configured the dual-fuel cut over point, and will be calibrating the outdoor temp sensor.
I'm upset that I did not end up with at least a partially communicating system as promised. I have had a few emails back and fourth with the sales guy, and in hindsight would have paid the extra 10% for the XC95m furnace to have a fully communicating system and in fact suggested that they go ahead and make the swap for me to be a referable customer.
Is that unreasonable? Should I just suck it up and live with what I have?
Btw, which would be the most economical cut over point for me to switch from HP to LP for heating given my energy costs and equipment efficiencies? If there a formula I can plug my numbers into to get something other than 0F, which seems way low to me? I would have expected 40-50 degrees to have been more optimal. The sales rep said they generally set the cutover at 40.
The overall install was top notch as far as making everything air tight and running the new line set to the outdoor unit, but I just don't know about the non-communicating furnace as it dumps down all the other components, and the error that I got on day 2.