Direct Drive Supply Air Inverter - Lennox LCH092H Unit Information

Caution - Units not equipped with a VFD will be set to Set­
tings > Control > MSAV VFD Bypass > None. The blower
motor could be damaged and/or result in product or proper­
ty damage if the setting is changed to automatic or manual.
TABLE 27
MINIMUM AND MAXIMUM CFM
092H, 102H, 120H, 150S, 150H
Gas Heat Minimum CFM
Unit
LGH092-150
LGH092-150
Electric Heat Minimum CFM
Unit Heat Size (kW)
LCH092-102
LCH092-150 7.5, 15, 22.5, 30, 45
LCH120-150
Cooling Minimum CFM - 220* CFM/ton
Unit
LGH/LCH092
LGH/LCH102
LGH/LCH120
LGH/LCH150
Cooling Minimum CFM - 280* CFM/ton
Unit
LGH/LCH092
LGH/LCH102
LGH/LCH120
LGH/LCH150
Smoke and Ventilation Minimum CFM - 150 CFM/ton
Unit
LGH/LCH092
LGH/LCH102
LGH/LCH120
LGH/LCH150
Heating and Cooling Maximum CFM - 480 CFM/ton
Unit
LGH/LCH092
LGH/LCH102
LGH/LCH120
LGH/LCH150
*Refer to table 29 for ultra high efficiency unit minimum
CFM / ton. Ultra high efficiency units are equipped with tan­
dem compressors which allow lower minimum airflow.
Gas Heat Size
Airflow CFM
Std. , Med.
High
Airflow CFM
0
0, 60
Blower Speed
Airflow CFM
Low
Low
Low
Low
Blower Speed
Airflow CFM
High
High
High
High
Not Applicable
Airflow CFM
NA
NA
NA
NA
Blower Speed
Airflow CFM
High
High
High
High
VIII-Direct Drive Supply Air Inverter
If a test and balance contractor has not commissioned the
unit, use this section to set supply air CFM.
A-Set Blower Speed
1 Use table 28 to fill in field-provided, design specified
blower CFM.
Blower CFM Design Specifications
Blower Speed
2225
2550
Heating
Cooling High
Cooling Low
Ventilation
2800
2 Use the following menu to enter the blower design
2800
specified CFM into the Unit Controller. Don't press
4000
"SAVE" until all CFM are entered. Make sure blower
CFM is within limitations shown in table 29. Refer to the
Unit Controller manual provided with unit.
SETUP > TEST & BALANCE > BLOWER
1650
1870
3 Once all four speeds are entered, the target (highest of
the heating and cooling settings) CFM and default
2200
RPM will be displayed.
2750
Note - When units are not equipped with heat, the Blower
Heat speed will not be displayed. Blower Cooling High will
be the first blower speed to appear.
4 Measure the static pressure as shown in the Blower
2100
Start-Up section. Use the static pressure, target CFM
2380
and blower tables to determine the RPM needed. Val­
2800
ues in the blower table reflect the static pressures tak­
en in locations shown in figure 17.
3500
5 Enter the RPM and repeat the previous step until the
design CFM is reached.
6 Press SAVE followed by MAIN MENU.
1125
Note - Once the CFM settings are saved, the Unit Controller
1275
will set all other blower CFM.
1500
1875
3600
4080
4800
6000
Page 66
TABLE 28
Design
Specified CFM