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ACC-APG001A-EN
Conventional Thermostat Sequence of Operation
When the Odyssey system is configured to operate with a conventional thermostat, the controller
provides protection for the system (see General Support Sequence section) and continues to
provide insight to operating conditions. A conventional thermostat can be applied with constant
volume cooling only, heat pump, and single zone 2-speed fan configured systems. While not
recommended, a conventional thermostat can be applied to single zone variable volume
configured systems, but the system is limited to staged fan control instead of a fully variable
sequence.
When under conventional thermostat control, the equipment responds directly to operating
requests from the thermostat device. Each thermostat input corresponds to a specific unit
function, as described in the following tables. Equipment protection functions and compressor
minimum on/off timers remain in-control, even when under conventional thermostat control.
Table 2. Cooling only/electric heat systems
Inputs Outputs
X Y1 Y2
W1/O
W2 G
Supply
Fan On/
Off
Request
Supply
Fan Speed
Request
Compres-
sor Cool
Stage
Request
Auxiliary
Heat
Stage
Request
Heat Cool
Mode
Status
NA OPEN OPEN OPEN OPEN CLOSED ON Min None None
Fan Only
NA OPEN OPEN CLOSED OPEN X ON Max None
Stage 1
Heat
NA OPEN OPEN X CLOSED X ON Max None
Full Stage
Heat
NA CLOSED OPEN OPEN OPEN X ON Min
Stage 1
None Cool
NA OPEN CLOSED OPEN OPEN X ON Min
Stage 1
None Cool
NA CLOSED CLOSED OPEN OPEN X ON Max
Full Stage
None Cool
NA X X X X X OFF 0 None None OFF
X=ignored by controller
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