Lennox iHarmony 10C16 Installation And Setup Manual page 14

Discharge Air
Temperature
Sensor (88K38)
NOT USED
PWR
D+
D-
C
12.5 VDC
JUMPER MUST BE SET
TO 1 -4. THE SETTING
FOR 5-8 IS FOR FUTURE
USE.
FACTORY
DEFAULT
Lennox Communicating Air Handler: Lennox Communicating Furnace:
Y1-Y2 2-stage Compr W915 Two-Stage Compr
W951 Heat Pump
R-O Heat Pump
R-DS Dehum or Harmony III W914 Dehum or Harmony III
W1, W2 and W3
NOTE 1:
FREEZESTAT TERMINAL
Pressure Switch
WILL HAVE FACTORY
(27W13) Required for
INSTALLED INSERTION
Heat Pump System)
BRIDGE.
On heat pump systems
do not use jumper to
DO NOT REMOVE UNLESS
bypass pressure
CONNECTING A
FREEZESTAT (93G35 OR
switch.
50A93) TO THIS TERMINAL.
FACTORY INSTALLED
INSERTION BRIDGE
(SEE NOTE 1)
SENSE 24VAC SENSE 24VAC
C SENSE SENSE 24VAC
FREEZESTAT
DATS PRESSURE SW
PWR
D+
D-
3
C
PWR
IN-ZONE THERMOSTAT
D+
COMM LED (GREEN)
D-
C
1 – 4
PWR
5 - 8
D+
D-
C
PWR
D+
D-
C
NOTE: When using iHarmony with a non-communicating outdoor unit, the following links on the indoor
Lennox control need to be configured as follows:
1. Cut the R-O or W951 link when the outdoor unit is a heat pump.
2. Cut Y1 to Y2 or W915 when independent high and low stages are required for 2-stage outdoor cooling unit.
3. DO NOT cut R to DS or W914 when using iHarmony control.
4. Remove flat metal jumpers between W1, W2 and W3 on the Lennox Air Handler Control.
NOTE: Interlock switch alarm 370 is activated when cutting W914 link on a two-stage communicating Lennox IFC.
Figure 7. Damper Control Jumpers LEDs and Connections
DMPR
SYS
XFMR
XFMR
(DEFAULT)
External 24VAC
Damper Transformer
R C
R C
G DMPR XFMR
DMPR SYS
XFMR
XFMR
RSBUS COMM LED
(GREEN)
3 AMP FUSE
STATUS LED
(GREEN)
PS LED (RED)
CNTRL LED (RED)
(ZONING OFF)
DAMPER CONTROL
MODULE (DCM)
14
Lennox Communicating
Thermostat (Smart Hub)
R i+ i- C
Lennox Communicating
Indoor Unit
i+ i- C
R
R i+ i- C
INDOOR
DMPR1 LED (RED)
NC
NO
Spring-Open,
Power Closed Damper
DCOM
NC
NC
NO
NO
C
DCOM
DMPR2 LED (RED)
DMPR3 LED (RED)
NC
NO
DCOM
NC
NO
DCOM
DMPR4 LED (RED)