Lennox Dave Signature XP21 Installation Instructions Manual page 11

COMMUNICATING SYSTEM
The jumper settings and link are default settings and ON­
LY control system operation if configuration settings in the
®
iComfort thermostat are not available.
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.
XP21 Two−Stage
Heat Pump Control
W
L
Y2
Y1
O
DS
2
C
7
R
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
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 R-O HEAT PUMP for heat pump applications.
6. Cut on-board link (clippable wire) from Y1-Y2 2 STAGE COMPR for two-stage compressor and two-speed fan operation.
7. Cut loop jumper (clippable wire) Short DS to R for Humiditrol
must be installed between the DS terminals on the air handler and outdoor unit controls.
8. Cut on-board link (clippable wire) DS-R for Humiditrol
setting. See air handler installation instruction or Product Specification bulletin for lowest fan speed information.
FIGURE 11. ComfortSense
NON-COMMUNICATING SYSTEM
The unit will operate based on jumper settings and R TO
DS link on the MAIN CONTROL. All unit setting changes
must be done at the MAIN CONTROL. The Lennox
ComfortSense
other non-communicating electronic-only thermostats.
Air Handler Control
DS
8
O
5
L
H
DH
R
C
Y1
6
Y2
G
W3
3
W2
4
W1
®
7000 - catalog number Y0349 only. Resistor Kit (catalog number 47W97)
®
applications. This will slow the outdoor unit's fan speed to a specific RPM. A wire
®
or Harmony IIIt applications. This will slow the indoor blower motor to the lowest speed
®
7000 Series Thermostat – Air Handler / Two-Stage Heat Pump
Page 11
®
7000 thermostat may be used, as well as
ComfortSense[ 7000 Thermostats
Catalog # Y0349 or Y2081
R
G
W2
W1
O
L
H
D
B
Y2
1
Y1
C
T
T
On−board link
Low voltage thermostat
wiring
Flat metal jumper
XP21 SERIES