Page 44
LGH/LCH156, 180, 210, 240, 300S
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 BLOWR 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
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.
TABLE 23
MINIMUM AND MAXIMUM CFM -
156, 180H, 210, 240H, 300S
Gas Heat Minimum CFM
Unit
Gas Heat Size
Airflow CFM
LGH156-300S
Low, Std. Med.
4500
LGH180-300S
High
5125
Electric Heat Minimum CFM
Unit
Heat Size (kW)
Airflow CFM
LCH156
All
5200
LCH180-300S
All
6000
Cooling Minimum CFM - 220 CFM/ton
Unit
Blower Speed
Airflow CFM
LGH/LCH156
Low, Med. Low, Med., Med. High
2860
LGH/LCH180
Low, Med. Low, Med., Med. High
3300
LGH/LCH210
Low, Med. Low, Med., Med. High
3850
LGH/LCH240
Low, Med. Low, Med., Med. High
4400
LGH/LCH300S
Low, Med. Low, Med., Med. High
5500
Cooling Minimum CFM - 280 CFM/ton
Unit
Blower Speed
Airflow CFM
LGH/LCH156
High
3640
LGH/LCH180
High
4200
LGH/LCH210
High
4900
LGH/LCH240
High
5600
LGH/LCH300S
High
7000
Smoke and Ventilation Minimum CFM - 150 CFM/ton
Unit
Not Applicable
Airflow CFM
LGH/LCH156
NA
1950
LGH/LCH180
NA
2250
LGH/LCH210
NA
2625
LGH/LCH240
NA
3000
LGH/LCH300S
NA
3750
Heating and Cooling Maximum CFM - 480 CFM/ton
Unit
Blower Speed
Airflow CFM
LGH/LCH156
High
6240
LGH/LCH180
High
7200
LGH/LCH210
High
8400
LGH/LCH240
High
9600
LGH/LCH300S
High
12000
