Page 24
XC21
Field Control Wiring
Y1
O
R
W1
G
D
R
Y1
L
C
C
B
Y2
Y2
W
O
DS
L
T
T
W2
H
W3
H
O
C
L
Y2
DS
DH
G
R
Y1
W2
W1
1
2
5
6
7
ComfortSense[ 7000 Thermostats
Catalog # Y0349 or Y2081
On−board link
Low voltage thermostat
wiring
Flat metal jumper
4
3
Air Handler
XC21 Two−Stage
Air Conditioner Control
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) Short DS to R 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. See table 14 for fan speed based on unit capacity.
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 11. ComfortSense® 7000 Series Thermostat Non−Communicating Connections −
Air Hander/Two−Stage Air Conditioner
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