Lennox SL18XC1 Installation Instructions Manual page 6

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 iComfortt-enabled thermostat
Quick Start Guide which is provided with the thermostat.
On−board link
Low voltage thermostat wiring
Flat metal jumper
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 only
when used with the ComfortSense
thermostat- (catalog number Y0349). Resistor Kit
(catalog number 47W97) required and ordered
separately.
3. Air handler control ships from factory with metal
jumpers (links) installed across W1, W2 and W3.
For single-stage electric heat, do not remove
factory-installed metal link.
4. Air handler control ships from factory with metal
jumpers installed across W1, W2 and W3. For
two-stage electric heat, cut factory-installed metal
link 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) 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
product specifications bulletin for lowest fan speed
information.
On−board link
Low voltage thermostat wiring
Flat metal jumper
1. Thermostat T terminals are used for outdoor sen­
sor 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
mostat - (catalog number Y0349). Resistor Kit
(catalog number 47W97) is required and must be
ordered separately.
3. Cut on-board link (clippable wire) DS-R for Humi­
®
ditrol or Harmony IIIt applications. This will slow
the indoor blower motor to the lowest speed set­
ting. See furnace installation instruction or prod­
uct specification bulletin for lowest fan speed in­
formation.
Single−Stage
Air Conditioner Control
Y2
®
7000
Y1
DS
2
i+
FIGURE 9
Single−Stage
Air Conditioner Control
®
7000 ther­
2
Cut on-board link (W914) (clippable wire) from DS to R for dehumidification (Optional).
FIGURE 10
Page 6
Air Handler Control
DS
O
W
L
L
5
H
DH
O
R
C C
Y1
Y2
i−
G
W3
R
W2
3
W1
Furnace Control
DS
O
W
L
L
3
H
Y2
DH
Y1
O
R
DS
C C
Y1
Y2
i−
G
i+
R
W2
W1
ComfortSense[ 7000 Thermostats
Catalog # Y0349 or Y2081
R
G
W2
W1
O
L
H
D
B
Y2
Y1
C
4
T
T
ComfortSense[ 7000 Thermostats
Catalog # Y0349 or Y2081
R
G
W2
W1
O
L
H
D
B
Y2
Y1
C
T
T
1
1