Lennox iHarmony 10C16 User Manual

10
How to convert electric heat watts to
BTUs/Hr
15KW = 15,000 Watts
15,000 Watts X 3.413 = 51,195 BTUs/Hr
» Verify Zoning Target Air Temp for HP Heating is 90°F (10° overshoot
range is 90°- 100°F).
» Verify Zoning Supply Air Temp Limit for Cooling is set to 40°F.
» Adjust Zoning Supply Air Temp Limit for Gas/Electric Heating
to160°F. Set high heating limit to minimum of 15° above operating target
DAT and round up to the nearest 5° limit option setting. Recommend
160° limit temp to avoid short cycling and DAT cool down mode
» Verify HP Heating Lockout Time is set to 60 min.
• Go to the Verify Airow Per Zone Screen.
» From the Equipment list, select reset and on the right side of the screen,
select re-congure system.
» Verify the dealer info is completed on the rst screen.
» Continue to navigate through the various screens until you arrive at the
iHarmony zoning screen. Verify the names for each zone are correct.
Then select continue.
» Select the following for each zone and set the correct CFM for the zone.
- Blower Circulation Airow per zone: For up to four zones, each
zone assigned airow at least the minimum CFM value per ton-
nage, for example 250 CFM for 3-ton, 380 for 4-ton or 450 CFM for
5-ton. Adjustment are in 5 CFM increments.
- Heating Circulation Airow per zone:
◊ Enter Recommended CFM Per Zone from “Zoning CFM Tables”
on page 17.
◊ On staged units, values are mid-range temp rise specic and
should only be changed if the maximum of <79% Indoor Blower
Power (IDBP) cannot be achieved.
◊ Final adjustment will be made after IDBP testing.
◊ If lower CFM is needed to maintain proper IDBP the value must
remain within the recommended range listed in the blower ta-
bles.
◊ On modulating units any value between the recommended and
max airow will operate at the same temp rise and can be se-
lected based on the amount of BTU’s each zone requires as per
load calculations.
◊ The percentage of Max BTU is relative to the percentage of Max
CFM.
◊ If a lower CFM is needed to maintain proper IDBP the value
must not go below the Absolute Min CFM per Zone listed in the
blower tables.
- Cooling Circulation Airow per zone:
◊ Enter the recommended CFM per zone for the cooling load per
zone maintaining CFMs above the minimum CFM values per
zone .
◊ Final adjustment will be made after IDBP and target air tempera-
ture approach are determined
• Once adjustments have been completed, select continue. This will take you
to the test mode.
Sizing the System
Select manual test then apply.
• Record and verify all blower settings were saved.
• Select continue at the bottom of the screen and select manual tests and
then select apply.
• From the select tests to run screen, select the option deselect all.
• Select maximum rate for the heating unit being tested.
» Verify heating rate 100%.
» Verify CFM demand matches the high heating airow setting.
» Verify IDBP <79%. The indoor blower power is helpful in determining if
the zone ductwork has a high static pressure that the blower may not be
able to overcome and cause the blower to run in cut back mode.
- If IDBP is <79 % do not adjust high heating airow.
- This value is designed for mid-range temp rise operation vital to
maximum heat exchanger life and performance.
» If IDBP is <79 % scroll down to the second discharge air temperature
(S30) reading below the zoning section on the same screen.
» Calibrate the DATS
- Move DATS probe in or out as required until discharge air sensor
value (located in diagnostics) is close to the actual discharge air
temperature target, the DAR is based on BTU/CFM/1.08+Return Air
Temperature. This is a mapping value generated by the DATS not
based on actual stratied plenum temperature.
- If the DATS value exceeds the overshoot range the furnace will not
maintain 100% capacity operation
» Return to previous screen
» Select maximum or 2nd stage cooling and start.
- Verify cooling rate 100%.
- Verify CFM demand is the value selected. Set the assigned airow
equal-to, or greater-than the maximum airow (airow assigned for
peak cooling load)

Lennox iHarmony 10C16 Specifications

General

Brand	Lennox
Model	iHarmony 10C16
Category	Control Unit
Language	English