Lennox SL18XP1 Installation Instruction page 9

Single−Stage
Heat Pump Control
W
L
Y2
Y1
O
DS
2
C
i−
i+
R
1. Thermostat T terminals are used for outdoor sensor input. Sensor provides input for thermostat's outdoor tempera­
ture display (optional).
2. R to L connection is required for this model only when used with the ComfortSense
number Y0349). Resistor Kit (catalog number 47W97) is required and must be ordered separately.
3. Cut on-board link W951 (clippable wire) from R-O HEAT PUMP for heat pump applications.
4. Cut on−board link (clippable wire) DS−R for Humiditrol
blower motor to the lowest speed setting. See furnace installation instruction or product specification bulletin for
lowest fan speed information.
NOTE - To use furnace to temper air during defrost, wire optional temper kit (67M41) between the W terminal of the heat
pump control (A175) and the W1 terminal on the furnace control. The temper kit cycles the furnace on and off during the
defrost cycle. It also protects the heat pump compressor from high pressures during defrost.
Furnace Control
DS
O
3
L
4
H
DH
R
C
Y1
Y2
G
W2
W1
®
or Harmony IIIt applications. This will slow the indoor
FIGURE 9
Page 9
ComfortSense[ 7000 Thermostats
Catalog # Y0349 or Y2081
R
G
W2
W1
O
L
H
D
B
Y2
Y1
C
T
T
®
7000 thermostat - (catalog
On−board link
Low voltage thermostat
wiring
1
SL18XP1 SERIES