Lennox LGT Series Unit Information page 23

The supply CFM can be adjusted by changing the per-
centage of motor output using the Unit Controller settings
Refer to table 5 for menu paths and default settings.. Re-
cord any RPM% changes on the parameter settings label
located on the inside of the compressor access panel.
CAUTION
The BLOWER CALIBRATION process starts the
indoor blower at operational speeds and moves
the economizer damper blades. Before starting this
process, replace any access panels and close all
unit doors except compressor compartment door.
Blower calibration is required only on units that are newly
installed or if there is a change in the duct work or air filters
after installation..
Parameter
Note: Any changes to Smoke CFM setting must be adjusted before the other CFM settings. Use SETTINGS > RTU OPTIONS >
EDIT PARAMETERS = 12 for EBM, 6 for ECM
BLOWER SMOKE CFM
SETUP > TEST & BALANCE > BLOWER
BLOWER HEATING HIGH CFM
BLOWER HEATING LOWCFM
BLOWER COOLING HIGH CFM
BLOWER COOLING LOW CFM
BLOWER VENTILATION CFM
SETUP > TEST & BALANCE > DAMPER
BLOWER HIGH CFM DAMPER POS %
BLOWER LOW CFM DAMPER POS %
POWER EXHAUST DAMPER POS %
SETTINGS > RTU OPTIONS > EDIT PARAMETERS = 216
POWER EXHAUST DEADBAND %
SETTINGS > RTU OPTIONS > EDIT PARAMETERS = 10 (Applies to Thermostat Mode ONLY)
FREE COOLING STAGE-UP DELAY
Installer: Record any parameter changes under "Field Setting" column. Settings need to be recorded by installer for use
when Unit Controller is replaced or reprogrammed.
TABLE 5
DIRECT DRIVE PARAMETER SETTINGS - 581102-01
Field
Setting
% Percentage of RPM for blower smoke speed.
% Percentage of RPM for blower heating high speed.
Percentage of RPM for blower heating low speed (P volt gas
%
heat only).
% Percentage of RPM for blower cooling high speed.
Percentage of RPM for blower cooling low speed and vent
%
speed for standard static blowers.
% Percentage of RPM for high static blower ventilation speed.
Minimum damper position for high speed blower operation.
%
Default 0%.
Minimum damper position for low speed blower operation. De-
%
fault 0%.
Minimum damper position for low power exhaust operation.
%
Default 50%.
% Deadband % for power exhaust operation. Default 10%.
Number of seconds to hold blower at low speed before switching
sec
to blower at high speed. Default 300 seconds.
Page 23
Use the mobile service app to navigate to the SET-
UP>TEST & BALANCE>BLOWER menu. After the new
RPM% values are entered, select START CALIBRATION.
The blower calibration status is displayed as a % com-
plete. Upon successful completion, the mobile service app
will display CALIBRATION SUCCESS and go back to the
blower calibration screen.
IMPORTANT - The default value for Cooling Low motor
speed is lower than a traditional singe- or two-speed unit.
If operating the unit with a 2- or 3-stage controller (2- or
3-stage thermostat, DDC controller, etc.), it is recom-
mended to increase the Cooling Low CFM default value
to a suitable level for part load cooling (typically 60% of
full load CFM).
Description