Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 48)

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Start-Up - Mixing Box (Optional)
Step 3 Set the Enthalpy Changeover Set Point (Optional)
If using an economizer, the enthalpy changeover setting must be set. If differential temperature or differential
enthalpy control is used, set the enthalpy changeover set point to D. If outside air temperature or enthalpy
reference is used, set the enthalpy changeover set point to the desired setting from the following table.
Step 4 Program Optional Room Stat
Program the optional room stat. Separate detailed instructions for programming the room stat ship with the
optional room stat.
NOTE!
For options EC-3 and EC-4 the enthalpy changeover set point is the temperature at which the
economizer will send the dampers to the minimum outside air position.
Enthalpy Changeover Setting
Setting
Changeover
Temperature* (ºF)
A 73
B 70
C 67
D 63
* Temperature at 50% relative humidity, see the Honeywell W7212
Economizer instructions for set points at other humidities.
Start-Up