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| Furnace |
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| 5 | ComfortSense[ 7000 Thermostats | |
| XC21 Two−Stage Air | Catalog # Y0349 or Y2081 |
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| DS |
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| Conditioner Control |
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| R |
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| W | O | G |
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| On−board link | ||
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| L |
| W2 | Low voltage thermostat |
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| L |
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| wiring | |
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| Y2 | H | W1 |
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| Y1 | DH | O |
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| O |
| L |
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| DS | R | H |
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2 | C | C | D |
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| Y1 | B |
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| 3 |
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| 4 | Y2 | Y2 |
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| 1 |
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| G | Y1 |
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| R |
| C |
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| W2 |
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| T |
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| W1 | T |
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1.Thermostat T terminals are used for outdoor sensor input. Use for thermostat’s outdoor temperature display (optional).
2.R to L connection is required for this model when using the ComfortSense® 7000 − catalog number Y0349 only. Resistor Kit (catalog number 47W97) required and ordered separately.
3.Cut on−board link W915 (clippable wire) for two−stage operation.
4.Cut loop jumper (clippable wire) DS to R on two−stage units for Humiditrol® applications. This will slow the outdoor unit’s fan speed to a specific RPM. A wire must be installed between the DS terminals on the furnace and outdoor unit controls.
5.Cut on−board link (clippable wire) DS−R for Humiditrol® or Harmony IIIt applications. This will slow the indoor blower motor to the lowest speed setting. See furnace installation instruction or engineering handbook for lowest fan speed information.
FIGURE 16
Page 15
XC21 SERIES
