Page 50
Note - Intake air CFM can also be determined using the out
door air temperature, return air temperature and mixed air
temperature. Refer to the economizer or outdoor air
damper installation instructions.
Set Minimum Position 2
Use the same menu in the Unit Controller to set “Min OCP
Blwr High” for the blower CFM above the “midpoint” CFM.
When navigating into this menu, the Unit Controller will
bring on the corresponding blower speed and allow damper
position adjustment.
SETTINGS > RTU OPTIONS > DAMPER > MIN
DAMPER POSITION BLOWER ON HIGH = X.X %
Measure the intake air CFM. If the CFM is lower than the
design specified CFM for ventilation air, use the Unit Con
troller 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 out
door air temperature, return air temperature and mixed air
temperature. Refer to the economizer or outdoor air
damper installation instructions.
TABLE 24
MINIMUM AND MAXIMUM CFM
Gas Heat Minimum CFM
Unit Gas Heat Size
Airflow
CFM*
LGM092/150 Std. , Med. 2225
LGM092/150 High 2550
Electric Heat Minimum CFM
Unit Heat Size (kW) Airflow CFM
LCM092 7.5 1750
LCM092 0, 15, 22.5, 30, 45 2750
LCM120, 150 15, 22.5, 30, 45 2750
LCM120, 150 0, 60 3500
Cooling Low Minimum CFM - 160 CFM/ton
Unit Blower Speed Airflow CFM
LGM/LCM092 Low 1200
LGM/LCM120 Low 1600
LGM/LCM150 Low 2000
Cooling High Minimum CFM - 220 CFM/ton
Unit Blower Speed Airflow CFM
LGM/LCM092 High 1650
LGM/LCM120 High 2200
LGM/LCM150 High 2750
Smoke and Ventilation Minimum CFM - 150 CFM/ton
Unit Not Applicable Airflow CFM
LGM/LCM092 NA 1125
LGM/LCM120 NA 1500
LGM/LCM150 NA 1875
Heating and Cooling Maximum CFM - 480 CFM/ton
Unit Blower Speed Airflow CFM
LGM/LCM092 High 3600
LGM/LCH120 High 4800
LGM/LCH150 High 6000
*Rounded to nearest 25 CFM.
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