Page 11
XP21 SERIES
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.
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
®
7000 thermostat may be used, as well as
other non-communicating electronic-only thermostats.
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
-enabled thermostat
Quick Start Guide
which is provided with the thermostat.
Y1
O
R
W1
G
D
R
Y1
L
C
C
ComfortSense
[
7000 Thermostats
Catalog # Y0349 or Y2081
B
Y2
Y2
W
O
DS
L
T
T
W2
H
W3
H
O
C
L
Y2
DS
DH
G
R
Y1
W2
W1
1
2
5
6
8
7
On
−
board link
Low voltage thermostat
wiring
Flat metal jumper
3
4
Air Handler Control
XP21 Two
−
Stage
Heat Pump Control
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
®
7000 - catalog number Y0349 only. Resistor Kit (catalog number 47W97)
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
®
applications. This will slow the outdoor unit's fan speed to a specific RPM. A wire
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
®
or Harmony III
applications. This will slow the indoor blower motor to the lowest speed
setting. See air handler installation instruction or Product Specification bulletin for lowest fan speed information.
FIGURE 11. ComfortSense
®
7000 Series Thermostat – Air Handler / Two-Stage Heat Pump
