Home Improvement Asked on January 5, 2022
I have a 2-stage cooling heat pump unit from Bryant, installed ~2006 (central Florida):
698BNX048-B
FE4ANB006
Shortly after moving in ~5 years ago, our evap coil was freezing over when cooling and the OEM Bryant thermostat was determined to be the issue. The home warranty company covered the cost of getting a new thermostat put in. The original Bryant thermostat (model SYSTXBBUID01-A
) is a communicating unit. This thermostat was replaced by a basic Honeywell unit, which as I’ve recently come to learn, doesn’t allow for any of the advanced capabilities of the system (e.g., 2-stage cooling).
The thermostat wiring was changed from the original 4-wire communicating-style setup to a "standard wiring" scheme (R
/C
/Y
/W
/etc.) Ideally I could reinstall an original Bryant thermostat, restoring all its features, but those run ~$800 new (or ~$400 used on eBay); I don’t see myself spending that on a 15 year old unit. Instead, I’m looking into other (cheaper) options, hoping I can at least restore 2-stage cooling at the compressor, which is currently running 2nd stage around the clock.
"standard wiring" schematics I’ve seen online align with how our system is wired (again, no longer communicating style). We have 8 wires from both the thermostat and condenser:
G
terminal at thermostat, but unused everywhere else)R
terminals at thermostat, handler and condenser)C
terminals at thermostat, handler and condenser)O
terminals at thermostat, handler and condenser)W
or W1
terminals at thermostat, handler and condenser)Y
or Y1
terminals at thermostat, handler and condenser)Y2
terminal at thermostat, but unused everywhere else)CEBD430510
G
terminal (what I’m trying to understand)HUM
terminal is unusedCEBD430439
A
, B
, C
, D
terminals are unusedAs mentioned, 2-stage cooling is not currently supported with our basic Honeywell thermostat. Our condenser board does not have the Black wire connected to a terminal; instead the Y2
terminal has a jumper wire from Y1
to Y2
. Here is our condenser board’s current wiring:
Y2
terminalRestating my goal of restoring 2-stage cooling at the compressor, I thought this would be as simple as:
Y1
and Y2
at the condenserY2
terminalFor the setup above, how is the blower fan in the air handler being controlled? Everything I’ve read talks about air handler boards having a G
terminal to control the fan, but my air handler doesn’t have a G
terminal and the green wires from the thermostat and condenser are unused.
My current assumptions are that:
Y
or W
terminals. If that’s the case, how would the fan know to turn on in a 2-stage cooling scenario where Black wire is energized?Black
wire has no impact on the air handler, only the condenser/compressor via the Y2
terminal.I know what they say about assumptions, so I’m looking for some more informed feedback. Thanks in advance!
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