Lennox Communicating Indoor Control Link Settings - Lennox iHarmony 10C16 Installation And Setup Manual

Damper control module

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Installation instructions manual (16 pages)

Table of Contents

in this range but is highly sensitive to air filter loading

restriction.

Select Zoning Control.

Verify the appropriate zone damper is 100% open and all others

are closed.

Verify from discharge air temperature using the following proce-

dures:

◊

On modulating units, the value will remain very constant be-

tween zones due to the gas valve modulating proportionally with

the airflow.

◊

On staged units the CFM will determine the DATS value based

on a fixed BTU output.

> Excessive air per zone will drive the DAT below target air

setting and initiate 2nd stage

> 2nd stage will then drive the temperature up to the over-

shoot limit and drop out with minimum air.

> The cycle is repeated with minimum 20° fluctuating dis-

charge temperature.

> Adjust each zone to operate in the adequate air range of the

zoning map within the proper IDBP percentage.

> The position of the DATS should not be changed as it is set

for continuous maximum capacity operation within the ade-

quate air range of the zoning map.

+ Verify DATS is tracking slow and steady in .4 - .5 incre-

ments. Temperature reading in large increment indicate

the CFM may need to be adjusted and IDBP % checked.

+ Verify steady state DATS in diagnostics is approximate-

ly the same as DAT operating target as per zoning map.

Pocket formula may be needed for this value.

+ if minimum air CFM was selected to specifically accom-

modate duct sizes >79% IDBP the DAT will run higher

as per the zoning map temperature ranges.

+ Verify DAT operating temp is less than zoning heating

limit or cool down mode will initiate, and short cycling

will occur.

Repeat for each zone installed

Select the next larger zone.

Initiate 5° heating call on subsequent zone while previous zone is

still on.

Wait for the "heating" status symbol to be displayed.

Scroll to previous zone and terminate call.

◊

This will prevent unit from cycling off.

◊

Proceed to diagnostics and record results.

If CFM changes need to be made do not use the test mode. Return to

dealer control center > equipment > reset > reconfigure system> stop on

the 6th commissioning screen.

Adjust CFM per zone as needed.

Changes will be saved and stored.

• Cooling test per zone

Same sequence as heating.

DATS position will not be changed.

DATS calibration is sensitive to specific heating performance.

DATS calibration in cooling mode.

Adjust CFM to respond to target air cooling temp setting selected in

zoning setup

Adequate air on the zoning map will find a thermal balance point

between target and 7° above that temp.

If the CFM selected achieves a point inside that range the ODU will

not continue to modulate up (staged or modulating units).

If the thermal balance point is not close enough to the target air

temp selected the CFM can be lowered to achieve that design

condition.

Good practice recommends a balance point within 2°F of target to ac-

commodate for air filter loading restriction

Discharge air temperature is subject to fluctuate based on differences in

total heat load.

Return to home screen and set all zones to normal operations.