Lch420; Options; Economizer Start-Up - Lennox LGH480 Installation Instructions Manual

Economizer Start-Up

The economizer, when configured, controls:
S
Damper position, which determines how much outdoor
air is used to meet free cooling or indoor air quality
requirements, and
S
Optional power exhaust fans.
On a cooling demand, outdoor air is used for free cooling
instead of first-stage compressor(s) when outdoor air is
suitable.
1.1.
Enabling Economizer and Settings
To enable the economizer, if installed, go to SETUP >
INSTALL and go through the wizard. When reaching
Configuration ID 1, position 2 will need to be set to the
applicable type of economizer. Valid types are:
S
M = Motorized Outdoor Air Damper Only
MENU INTERFACE (LEVEL 1 - SETTINGS) - M (MOTORIZED OUTDOOR AIR DAMPER ONLY)
Level 2 Level 3
RTU OPTION DAMPER
TABLE 14
Level 4
MIN DAMPER POSITION
BLOWER ON HIGH = X.X %
MIN DAMPER POSITION
BLOWER ON LOW = X.X %
DEMAND CONTROL VENT
DAMPER START OPEN = XXXX.X PPM
DEMAND CONTROL VENT
DAMPER FULL OPEN = XXXX.X PPM
DEMAND CONTROL VENT
DAMPER MAX OPENING = XXX.X%
FRESH AIR HEATING
ENABLE FAH = YES OR
FRESH AIR HEATING FAH SETPOINT = XX F
NO
FRESH AIR COOLING
ENABLE AFC = YES OR
FRESH AIR COOLING AFC SETPOINT = XX F
NO
Page 38
S
T = Economizer - Temperature (Note: Used for both set
point and offset temperature control.)
S
G = Economizer - Global
S
S = Economizer - Single Enthalpy
S
D = Economizer - Dual Enthalpy
Table 14 to 18 show the options depending on economizer
type set above. These settings are also available through
the main menu at SETUP > TEST & BALANCE >
DAMPER.
Use the SETUP > TEST & BALANCE > DAMPER menu to
check damper position. Visually inspect the damper
position and follow prompts to determine proper function.
Make sure zone boxes are open and respond to prompts to
operate the blower. Follow prompts to set minimum
damper position for high and low blower speeds.
USE THE ADJUST AND SET VALUES ARROWS
TO SCROLL UP OR DOWN FOR SELECTION
Level 5

OPTIONS.

LGH/LCH420, 480, 540, 600