6
7. In-zone thermostats are 12VDC devices that are
powered by the damper control module.
8. Connect zone dampers to proper terminals. Dampers
can be power-open / spring-close, power-close /
spring-open, or power-open / power-close type.
Connect to NC or NO and DCOM, depending on
type of damper being employed. Power-closed /
spring-open is the recommend damper and would be
connected to NO and DCOM.
9. See “Table 5. Damper Control Connections, Insertion
Bridge and Jumpers” on page 6 for required and
optional device connections to various terminals
10. LEDs — See “Table 6. LEDs” on page 7 for
complete descriptions for various LED functions.
11. Fuse —The control has a 3 amp fuse.
12. Error Codes—The damper control module stores NO
error codes; all codes are sent directly to thermostat.
For a list of errors that are sent to the thermostat, see
“Table 13. Alert Codes and Troubleshooting” on page
14
Lennox Communicating Indoor Control Link
Settings
When using the iHarmony
®
zoning system with a Lennox
communicating Indoor unit and non-communicating
(24VAC) outdoor unit all applicable control links illustrated
in “Figure 7. Damper Control Jumpers and Connections”
on page 7 should be congured as indicated. Failure
to cut or not cut only the required links will result in the
system being inoperable.
Table 5. Damper Control Connections, Insertion Bridge and Jumpers
Damper Control Label Description
INDOOR (Connection to iComfort furnace or air handler)
C RSBus 24VAC common
i+ RSBus data positive
I- RSBus data negative
R RSBus 24VAC power
DMPR XFMR / SYS XFMR Use factory default position.
DMPR XFMR
Connect zone damper 24VAC transformer wires to terminals DMPR R and XFMR C (see gure 8). Factory default
is DMPR XFMR.
G
SENSE
Connect the IAQ device requiring blower operation to the indoor unit control G terminal as illustrated
in the wiring diagrams located in the applicable iComfort Series Thermostat Installer Guide.
Place a wire jumper between the indoor unit G and damper control module G sense terminals. This
will allow the damper control module to adjust the indoor blower CFM from continuous blower speed
to the correct zone heating or cooling blower speed when any zone has a demand for heating or
cooling.
24VAC 24VAC power (NOT USED)
FREEZESTAT
SENSE
From the factory, an insertion bridge is installed between these two terminals. If a freezestat is to be
used, remove insertion bridge and replace with connections to freezestat. See table 3 on page 5 for
ordering freezestat. NOTE: If jumper is missing and no freezestat is installed the outdoor unit will not
operate.
24VAC
PRESSURE S/W
SENSE
A HFC-410A high pressure switch (catalog number 27W13) is required for applications with a Lennox
heat pump. This switch acts as a guard in case of high head pressures during rst- and second-stage
heating. The switch opens at 550 psig (3965 kPa) and closes (resets) at 425 psig (3102 kPa).
24VAC
DATS
SENSE
Terminals for the included discharge air temperature sensor (DATS). See gure 3 for installation
require ments.
24VAC
ZONE 5 (not used), ZONE 2/6,
ZONE 3/7 and ZONE 4/8
(NOTE: ONLY ZONES
2, 3 and 4) are used.)
PWR 12VDC power.
D+ Data positive
D- Data negative
C 12VDC common
DAMPER 1/5, DAMPER
2/6, DAMPER 3/7 and
DAMPER 4/8
NC Normally closed.
NO Normally opened.
DCOM Common
ZONE 1 - 4 / 5 - 8 The factory default for this jumper is 1-4. Do not set jumper to 5-8, which is not in use at this time.
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