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LGH/LCH036, 048, 060, 072
TABLE 31
MINIMUM / MAXIMUM CFM
UNIT SIZE
036 048 060
Cooling High Speed &
Heating Maximum
(480 CFM/ton)
1440 1920 2400
Cooling High Speed
Minimum (280 CFM/ton)
840 1120 1400
Cooling Low Minimum CFM
(220 CFM/ton)
660 880 1100
Ventilation Minimum CFM
(150 CFM/ton)
450 600 750
Standard Gas Heat Minim
um CFM (S,W)
970 970 970
Medium Gas Heat Minimum
CFM (M, Q, U, Y)
1120 1120 1120
High Gas Heat Minimum
CFM (H, T, X, Z)
1310 1310 1310
Electric Heat minimum CFM 1080 1280 1600
Outdoor Airflow Maximum
CFM
450 600 750
CEnter Outdoor Airflow Design Specifications Into
Unit Controller
Use the following menu path to enter the outdoor airflow
CFM (replaces minimum damper position set point) into
the Unit Controller. Make sure outdoor airflow CFM is
within limitations shown in table 31. Refer to the Unit
Controller manual provided with unit.
Settings Control MSAV Damper Outdoor Airflow
(enter value) Save Settings (yes / no)
After a YES or NO selection, display reverts back to
MSAV menu.
DOperation
1- After calibration, the indoor blower will supply the
CFM specified based on the thermostat demand
signal received by the Unit Controller:
G – Ventilation CFM
W – Heating CFM
Y1 – Cooling Low CFM
Y2 – Cooling High CFM
2- The Unit Controller, using input from PT5 and the
entered outdoor air flow CFM, will open the fresh
air dampers to minimum position. In addition, the
Unit Controller must have an occupied (OCP)
thermostat demand.
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