Orion System VCC-X Controller - Manual (Page 47)

VCC-X Controller Technical Guide
MODGAS-X CONTROLLER WIRING
47
MODGAS-X Controller Wiring
MODGAS-X Controller Wiring
The OE377-26-00058 MODGAS-X Controller (AAON Part No.
V12090) is designed to modulate up to (2) gas valves to maintain
a desired Discharge Air Temperature. It also controls the speed of
the induced draft fan to maintain proper combustion in the heat
exchanger.
The MODGAS-X Controller directly connects to the VCC-
X Controller or indirectly using an E-BUS Expansion Board via an
EBC E-BUS cable. See Figure 32.
The following information will be passed between the MODGAS-X
controller and the VCC-X Controller:

Heat activation command

Heating Discharge Setpoint
Figure 32: MODGAS-X Controller to VCC-X Controller Wiring Diagram
MODGAS-X CONTROLLER
(OE377-26-00058)
Supply
Air Temperature
Sensor
Mount In Supply
Air Duct
Connect
to AI3 & GND
On VCC-X Controller
Supply Air Temperature
Sensor
EBC E-BUS Cable
Connects To
VCC-X Controller’s
Expansion
Port
Set Jumper To 1.
Fan Enable
Low Speed Fan
24 VAC Power
Input Terminals
Max. Power
Consumption
1 Gas Valve
= 18 VA
2 Gas Valves
= 33 VA
Aux Heat Valve

The offset for the Supply Air Temperature Sensor

High Limit Temperature Setpoint

If the communication is interrupted between the
MODGAS-X Controller and the VCC-X Controller,
the MODGAS-X controller will revert to stand-alone
operation.
For more information, refer to the MODGAS-X Controller Technical
Guide.
NOTE: If using multiple E-BUS Sensors or Modules, the
E-BUS Hub or Adapter Board may be required.