Lennox Dave Signature XP21 Installation Instructions Manual page 12

XP21 Two−Stage
Heat Pump Control
W
L
Y2
Y1
O
DS
2
C
5
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
47W97) required and ordered separately.
3. Cut on-board link W951 (clippable wire) from R-O HEAT PUMP for heat pump applications.
4. Cut on-board link W915 (clippable wire) for two-stage operation.
5. Cut loop jumper (clippable wire) Short DS to R for Humiditrol
must be installed between the DS terminals on the furnace and outdoor unit controls.
6. Cut on−board link (clippable wire) DS−R for Humiditrol
setting. See furnace installation instruction or Product Specification bulletin for lowest fan speed information.
NOTE - For defrost temper with furnace, the optional 67M41 temper kit would be wired between W of from the heat pump control (A175) to the W1 of
the furnace control The kit allows for the furnace to cycle on and off during a defrost. It protects the compressor from high refrigeration pressures
during defrost.
FIGURE 12. ComfortSense
Furnace Control
6
DS
O
3
L
H
DH
R
C
Y1
4
Y2
G
W3
W2
W1
®
®
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 – Furnace / Two-Stage Heat Pump
Page 12
ComfortSense[ 7000 Thermostats
Catalog # Y0349 or Y2081
R
G
W2
W1
O
L
H
D
B
Y2
Y1
C
T
T
7000 - catalog number Y0349 only. Resistor Kit (catalog number
On−board link
Low voltage thermostat
wiring
1