STEP 5 −− ELECTRICAL (Continued) −− Field Control Wiring
The following two illustrations provide examples of control wiring connections when using a non−communicating thermostat. For examples of control wiring in complete or partial communicating systems, see the icomfortt−enabled thermostat Quick Start Guide which is provided with the thermostat.
| Air Handler |
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| ComfortSense[ 7000 Thermostats | |
| 7 |
| Catalog # Y0349 or Y2081 | |
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XC21 Two−Stage | DS |
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Air Conditioner Control |
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| R |
| 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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| Y2 | H | W1 | Flat metal jumper |
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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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| 5 |
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| 6 | Y2 | Y2 |
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| 1 | |
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| G | Y1 |
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| R | W3 | C |
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| 3 | W2 |
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| 4 | 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.Air handler control ships from factory with metal jumpers installed across W1, W2 and W3. For one−stage electric heat, do not remove factory installed metal jumpers.
4.Air handler control ships from factory with metal jumpers installed across W1, W2 and W3. For two−stage electric heat, remove factory installed metal jumper between W1 to W2. Then connect thermostat wire between the air handler control’s W2 and the thermostat’s W2 terminal.
5.Cut on−board link (clippable wire) from Y1−Y2 2 STAGE COMPR for two−stage compressor and two−speed fan operation.
6.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 air handler and outdoor unit controls.
7.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 air handler installation instruction or engineering handbook for lowest fan speed information.
FIGURE 15
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