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
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