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VCCX2 Controller Technical Guide
Figure 44: PREHEAT-X Controller to VCCX2 Controller Wiring
PREHEAT-X and PREHEAT-X-EXT
Controller Wiring
The ASM01688 PREHEAT-X Controller and ASM01689
PREHEAT-X-EXT Controller are designed to control xed stages
of Preheat and optional modulating Preheat to maintain a desired
Preheat Leaving Air Temperature Setpoint. The PREHEAT-X
Controller is limited to a 35°F Leaving Air Temperature Setpoint.
The PREHEAT-X-EXT Controller has an extended Leaving Air
Temperature Setpoint range down to 0°F. It should only be used
with the approval of AAON.
Either PREHEAT-X Controller directly connects to the VCCX2
Controller or indirectly using an E-BUS Expansion Board via an
EBC E-BUS cable. See Figure 44, this page for wiring.
The following information will be passed between either
PREHEAT-X Controller and the VCCX2 Controller:
• Leaving Air Temperature Setpoint
• Entering Air Temperature Setpoint
• Preheat Enable Signal
• Leaving Air Temperature Status
• Entering Air Temperature Status
• Alarm Status
• If the communication is interrupted between the
PREHEAT-X Controller and the VCCX2 Controller,
the PREHEAT-X Controller will be disabled.
For more information, refer to the PREHEAT-X or PREHEAT-
X-EXT Controller Technical Guide.
WIRING
PREHEAT-X and PREHEAT-X-EXT Controller
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