Lennox Harmony III, Installation, Setup And User Manual

Page: 63 / 80

63
Table 15. Diagnostics Codes
Code
#
(0-off;1-on)
Diag
LED1234
Fault Indicated Remedy
Fail-safe
(System
Shut
Down)
9 1001
Open pressure
switch (heat
pump systems
only)
Displayed when the pressure switch opens and does not necessarily mean there is anything wrong. However, try increasing the air delivered to
the smallest zone. An open pressure switch will stage the heat pump down to 1st stage only, if after 90 seconds the switch does not close, the
heat pump is shut off and backup heat is used to satisfy the call. Green Pressure switch LED on zone panel will be off.
No
10 0101
Insufficient
heating
Occurs when there is a call for heating and the Discharge Air Sensor does not sense a increase in supply air temperature indicating the heating
is not functioning properly.
No
11 1101
DAS sensed
frozen coil
Indicates discharge air temperature sensed by discharge air sensor drops below 45 degrees during the cooling mode. When sensed, the air
conditioner unit will stop and as long as the cooling demand is present the ID blower will continue to run until the 5 minute timed off timer expires
and the discharge air sensor senses 55ºF.
No
12 0011
Multiple jumper
selection
Each jumper block on zone control panel is allowed only one jumper, except for the system setup block. Remove extra jumper. No
13 0111
Dual-fuel furnace
use lock-in
Heat pump was not able to maintain desired discharge air temperature; furnace will be used to satisfy heat calls for the next three hours. After
three hours, the heat pump will be used again.
No
6.3. Air Delivered By Blower
The actual CFM delivered to each zone will be determined by the zone control
system settings, blower motor control board settings, zone thermostat demand
status (calling for heating, cooling, continuous fan, or no demand [zone damper
closed]), and the air distribution system’s duct size.
6.3.1. Formulas
When the zone control system is set for a particular zone, heating reduction jumper,
and/or continuous air reduction settings determine the total CFM available from the
unit as follows:
1. Determine Total Unit PIAB
— Using the formula in “Table 16. Determine total
PIAB and Total CFM Delivered” calculate the Total Percent into Adjustment
Band. This illustrates the percentage into the adjustment band that the motor
runs when more than one zone is calling for conditioning.
2. Determine Total CFM Delivered — Continuing from the previous example
and assumptions, and using the formula in Table 11, calculate the total CFM
delivered. The maximum and minimum CFM values used in the formula should
correspond to the jumper settings on the blower control board. This value
represents the volume of air received if all zones were calling for cooling.
3. Determine heating PIAB and Total Heating air CFM Delivered during a
Heating Call — Calculate these totals using the formulas and examples in
“Table 17. Determine Total Heating CFM delivered”.
4. Check ”CFM” LED or 7-Segment LED on indoor unit to obtain approximately
CFM the indoor unit is operating at.
5. Determine Total Air Delivered during a Continuous Blower Cal
l — Calculate
these totals using the formulas and examples in “Table 18. Determine Total
Continuous CFM delivered”.
IMPORTANT
If any blower speed settings (furnace or air handler) are changed, the zone
control PIAB calculations must be performed again to ensure proper airflow.