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TABLE 10
HEATING, VENTILATION & SMOKE MINIMUM AND MAXIMUM CFM
Unit Heating CFM Vent CFM Smoke CFM
Model Speed Heat Code Default Min Max Default Min Max Default Min Max
LDT156H
Low L
6000
2725
6250 5200 1950 62500 5200 1950 6250
Std S 4325
Med M 4500
LHT156H
HP W/O EH N 3900
15, 30, 45, 60, 90 KW E, J, K, L, 6000
LDT180H
Low L
6000
2725
7200 6000 2250 7200 6000 2250 7200
Std S 4325
Med M 4500
High H 5125
LHT180H
HP W/O EH N 4500
15, 30, 45, 60, 90 KW E, J, K, L, P 6000
LDT240H
Low, Std, Med L, S, M
8000
4500
9600 8000 3000 9600 8000 3000 9600
High H 5125
LHT240H
HP W/O EH N 6000
15, 30, 45, 60, 90 KW E, J, K, L, P 6000
*Use highest value between Heating and Cooling High CFM Max.
TABLE 11
COOLING MINIMUM AND MAXIMUM CFM
LHT/
LDT
Unit
Cooling Low CFM Cooling High CFM
Default Min Max Default Min Max
156H 3380 1500 6250 4675 4000 6250
180H 3900 2000 7200 5400 5000 7200
240H 5200 3000 9600 7200 6250 9600
*Use Cooling High CFM Max.
Set Minimum Position 2
Use the following mobile service app menu in the Unit
Controller to set “Min OCP Blwr Low” for the blower CFM
below the “midpoint” CFM. When navigating into this
menu, the Unit Controller will run damper calibration and
allow damper position adjustment.
RTU MENU > SETTINGS > RTU OPTIONS > DAMPER
Tap "Next" to skip tabs and complete damper position
calibration until "Damper Calibration Blower Speed High"
tab appears.
Measure the intake air CFM. If the CFM is lower than the
design specified CFM for ventilation air, use the Unit
Controller to increase the damper percent open. If the
CFM is higher than specified, decrease the damper
percent open.
Note - Intake air CFM can also be determined using the
outdoor air temperature, return air temperature and
mixed air temperature. Refer to the economizer or
outdoor air damper installation instructions.
E-Inverter Bypass Option
The supply air inverter is factory-set to by-pass the
inverter manually. To by-pass the inverter and operate the
blower in the constant air volume mode, use the following
Unit Controller menu and set to “engaged”:
SETTINGS > RTU OPTIONS > BLOWER > VFD
BYPASS
To configure the unit to by-pass the inverter automatically,
use the following Unit Controller menu.
SETUP > INSTALL
Press SAVE until the menu reads:
CONFIGURATION ID 1
Change the 6
th
character position to A for automatic
bypass option.
Press SAVE
Caution - Units not equipped with an inverter will have the
6
th
character set to N, indicating the inverter is not
bypassed. The blower motor could be damaged and/or
result in product or property damage if the setting is
changed to automatic or manual.
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