Lennox SL18XP1 Installation Instruction page 8

STEP 2 -- 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 iComfort
Quick Start Guide which is provided with the thermostat.
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
temperature 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. Air handler control ships from factory with metal jumpers installed across W1, W2 and W3. For single-stage electric
heat, do not remove factory-installed metal jumper.
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 and 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 R-O HEAT PUMP for heat pump applications.
6. Cut on-board link (clippable wire) DS-R for Humiditrol
motor to the lowest speed setting. See air handler installation instruction or product specification bulletin for lowest
fan speed information.
Air Hander Control
DS
O
5
L
6
H
DH
R
C
Y1
Y2
G
W3
3
W2
4
W1
®
or Harmony IIIt applications. This will slow the indoor blower
FIGURE 8
Page 8
ComfortSense[ 7000 Thermostats
Catalog # Y0349 or Y2081
R
G
W2
W1
O
L
H
D
B
Y2
Y1
C
T
T
®
7000 thermostat - (catalog
® -enabled thermostat
On−board link
Low voltage thermostat
wiring
Flat metal jumper
1