Reznor R6GN Option - Installation - Economizer - Manual (Page 4)

OPERATION
A - Cool ing Mode
1. On a call for cooling, with ambient temperature and humidity above enthalpy control setpoint, damper will open to
minimum vent position.
2. On a call for cooling, with ambient temperature and humidity suitable for cooling, enthalpy control will shift stage one
control to outside air and shift stage two thermostat to first stage compressor. Damper will modulate to control supply
air temperature at 55° F (13° C). If additional cooling is required, compressor one may be energized through second
stage of thermostat.
B - Heat ing Mode
1. On a call for heat damper will open to the minimum vent position.
C - Enthalpy Con trol
The enthalpy control senses both temperature and humidity or the heat content of the outside air. It controls the amount of
outdoor air brought into the system. When the heat content of the outside air is below control setpoint, the control
modulates outdoor dampers to meet cooling needs of the building. When the heat content rises above control setpoint, the
control closes outdoor dampers to minimum position. The recommended setpoint is “A”. If Economizer is allowing air
which is too warm or too humid to enter the system, control may be changed to a lower setpoint (B, C, or D). Refer to Figure
8.
IN STAL LA TION
IN STRUC TION
INSTALLATION INSTRUCTIONS FOR
555621
ECONOMIZERS USED WITH R4GM 150/180 UNITS
Fig ure 8