Orion System MODGAS II - Manual (Page 12)

Section 1 MODGAS II Controller
1-8 Overview and Wiring
Setting DIP Switches
Discharge Air Temperature
This switch is only used when the controller is operated in stand-alone mode. The main unit
controller will set the discharge setpoint when the MODGAS II is used as an expansion device.
The user can set the desired Discharge Air Temperature Setpoint using the DIP Switch
labeled DISCHARGE SETPOINT. See Figure 1-5 for location and DIP Switch setting
instructions. The MODGAS II Controller will allow the user to set a Discharge Air
Temperature Setpoint between 4
0°F and 200°F. If a value of less than 40°F is set, the
controller will default to a 4 0°F Discharge Air Temperature Setpoint, a value greater
than 200 °F will cause the unit to default to a 140°F Discharge Air Temperature
Setpoint.
Discharge Air Temperature Reset Limit
The user can reset the Discharge Air Temperature Setpoint by supplying a 0-10VDC
control signal to the Reset Input (RST IN) terminal on the MODGAS II Controller
board. The reset range is determined by the RESET LIMIT DIP Switch. See Figure 1-5 for
location and setting instructions. The controller will reset the Discharge Air Temperature
Setpoint from the value set on the DISCHARGE SETPOINT DIP Switch to the value set on the
RESET LIMIT DIP Switch, as the Reset Input (RST IN)
signal is increased from 0Volts to 10Volts.
Example:
We want the Discharge Air Temperature Setpoint to increase from 70
°F when the Reset Input
signal is at 0 Volts to 130 °F when the Reset Input signal is at 10 Volts.
• Set the DISCHARGE SETPOINT DIP Switch to 70°F
• Set the RESET LIMIT DIP Switch to 130°F
The discharge air temperature will now increase from 70 °F to 130°F as the Reset Input voltage
signal ramps from 0 Volts to 10 Volts.