Modulation - Greenheck IG Installation, Operation And Maintenance Manual

Sequence of Operation
2:1 Modulation Sequence,
• N.O. contact on cool relay (RC) is energized and
closed
• Power passes to evaporative cooling pump (P1)
*If DX or chilled water coils are used rather than an
evaporative cooler, the cooling sequence of operation
will depend on the coil controls. Cooling coil controls are
supplied by others.
40
Model IG / IGX Make-Up Air
Operation
4:1 Modulation and
continued
8:1 Staged Controller
Function
Enter
Program Mode
Program Mode allows the user to view the Program
Menu and edit the factory default settings. To access
Program Mode and view the Setpoints Menu, press
and hold the Function key for three seconds. While
viewing the Setpoints Menu, press the Up or Down
key to scroll through the menu options. To view the
setting of the selected menu option, press the Enter
key. To edit the setting, press the Up or Down key
while viewing the setting. To save the setting and
return to the Setpoints Menu press the Enter key.
To return to the Setpoints Menu without saving the
change, wait 15 seconds. To exit Program Mode from
the Setpoints Menu, wait 15 seconds.
Changing the default settings will significantly affect
performance. Only change a setting after reading
and understanding this entire manual.
The Enter key must be pressed to save any changes
made to a setting.
Inlet Air Sensor (iAS)
The inlet air sensor monitors the temperature of the
inlet air. If the inlet air is above the sensor's set point,
the inlet air sensor shuts off the furnace and continues
to supply the warm outside air. The inlet air sensor is
preset to the factory recommended 65ºF for 8:1 and
60ºF for 4:1.
Discharge Air Temperature (dtS)
The discharge air temperature setting is the
temperature that the unit will discharge. The discharge
air temperature is preset to the factory recommended
70ºF. The actual discharge air temperature is the
default display.
Outside Air Temperature (OAt)
To temporarily display the outside air temperature, use
the Up or Down key until the display reads "OAt," then
press the Enter key.
L1 L2 L3
Water Wizard™ User Interface
Key Function Description
WARNING
NOTE
Up
Down
®