3
Dampers
See table 1 to determine the minimum damper transformer
VA requirements based on the number of zones being
installed. If extended zone dampers are used then see
figure 2 for damper, transformer and zone relay wiring
requirements.
Refer to the iHarmony
®
Zoning System Product
Specification for ordering dampers and other various
components.
Once the damper control module has been installed and
the system energized, the damper control module will
automatically populate the thermostat commissioning
screens. All zone CFM settings will be selected from
commissioning screens for continuous blower and both
heating / cooling blower operations. Testing CFMs for
each or all zones may also be performed.
1.
The extended damper transformer will only supply
power to extended dampers and relay contacts.
2.
The system transformer powers the relay coils (0.4VA
each).
3.
Combined load of damper transformer (see “Table 1.
Zone Damper Transformer Selection Chart” on page
2) and add 0.4VA per zone relay to determine the
minimum damper transformer VA requirements. Total
VA requirements should not exceed 60VA.
NOTE:
Connections illustrated here are for the Lennox
recommended spring- open/power -close dampers.
The connections would be different for other
dampers.
NOTE:
Use Lennox Part catalog number 56L68 for zone
relays 1 through 4. (Pulse Control Relay, SPDT, 1
N.O. and 1 N.C., 24VAC)
MAIN
POWER
MAIN
POWER
DAMPER TRANSFORMER – POWERS DAMPER CONTROL MODULE,
Figure 2. Damper and Extended Damper Wiring
Diagram
Discharge Air Temperature Sensor - DATS
The included discharge air temperature sensor
(88K38) monitors the supply air. “Figure 4. Discharge
Air Temperature Sensor Installation (Typical Up-Flow
Furnace)” shows the discharge air temperature sensor.
This electronic sensor’s probe is inserted into the discharge
air plenum (see “Figure 3. Discharge Air Temperature
Sensor Installation - DATS”) to gather air temperature
data for the zone control module.
•
When possible, position the sensor some distance away
from the coil rather than in the immediate coil area.
•
The DATS should be located at least 19 inches above
the air handler unit and 10 inches above cooling coil
with a furnace.
•
Locate the tip of the sensor 1/2 the depth of the plenum,
and centered over the discharge airflow, side- to -side in
the discharge plenum
• Fasten the sensor bracket to the plenum with two self-
tapping sheet metal screws.
•
Connect wires to DATS on damper control module, NOT
on the Lennox communicating indoor unit control.
NOTE:
FOR UNITS WITH HUMIDITROL—Discharge air
sensor temperature (DATS) MUST be located on
the output side of the EDA (if used; see Humiditrol
Zoning Accessory Installation 505,337M).
IMPORTANT
If the DAT sensor has failed, shorted or not installed,
iHarmony will only operate in central mode. This mode is
also indicated by the DCM central mode LED being on.
There is no notification by the thermostat for this issue.
Figure 3. Discharge Air Temperature Sensor
Installation - DATS
coil
FURNACE
FRONT
VIEW
1/2
the width
of the
plenum
10 (254)
AIR HANDLER
SIDE VIEW
ECB
Electric
Heat
Strips
PLENUM
SENSOR
MOUNTING
DETAIL
19
(486)
Damper Control Module
Figure 4. Discharge Air Temperature Sensor
Installation (Typical Up-Flow Furnace)
Summary of Contents for iHarmony 10C16
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