Lennox XC21 Installation Instructions Manual page 24

XC21 Two−Stage Air
Conditioner A175
Control
W
L
Y2
Y1
O
DS
C
2
4
R
1
Outdoor sensor for outdoor temperature display (Optional).
R connection required for outdoor unit with Air Conditioner A175 Control LSOM function. Resistor Kit (Cat# 47W97) is required when using
2
the ComfortSense 7000 (Y0349) with Air Conditioner A175 Control LSOM
(Y2081).
3 Cut Furnace Control on−board link W915 (clippable wire) for two−stage operation.
Cut loop jumper (clippable wire) for Humiditrol
4
RPM. A wire must be installed between the DS terminals on the air handler and outdoor unit controls.
Cut on−board link (clippable wire) DS − R for Humiditrol
5
lowest speed. See furnace installation instruction or engineering handbook for lowest fan speed.
Figure 10. ComfortSense® 7000 Series Thermostat
506518−01
Furnace
5
DS
O
L
H
DH
R
C
Y1
3
Y2
G
W2
W1
feature. Resistor kit not required when using ComfortSense 7000
®
application. This will slow the outdoor unit's blower motor to 250
®
or Harmony III
Furnace/Two−Stage Air Conditioner
Page 24
ComfortSense[ 7000 Thermostats
Catalog # Y0349 or Y2081
R
G
W2
W1
O
L
H
D
B
Y2
Y1
C
T
T
TM applications. This will slow the indoor blower motor to the
Non−Communicating Connections −
On−board link
Low voltage thermostat
wiring
1