13
VCCX2 Controller Technical Guide
PART NO.
PART DESCRIPTION
ILLUSTRATION
PAGE NO.
ASM01668
MODGAS-X Module
The MODGAS-X modulates up to two 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 connects to
the VCCX2 Controller via an E-BUS cable. Available only from AAON.
Page 61
ASM01695
MODGAS-XWR2 Module
The MODGAS-XWR2 is designed to be used with White Rogers valves only.
It will modulate up to two White Rodgers gas valves to maintain a desired
Discharge (Supply) Air Temperature (up to four) modulating gas valves may be
controlled when a second MODGAS-XWR2 is configured as a slave module). It
also controls the speed of the induced draft fan to maintain proper combustion in
the heat exchanger. The MODGAS-XWR2 connects to the VCCX2 Controller via
an E-BUS cable.
Page 62
ASM01670
MHGRV-X Module
The MHGRV-X controls a Modulating Hot Gas Reheat Valve to maintain a
desired Supply Air Temperature and Dehumidification Setpoint. The MHGRV-X
Controller connects to the VCCX2 Controller via an E-BUS cable.
Page 60
ASM01687
MHGRV REHEAT Expansion Module
The MHGRV Reheat Expansion Module is designed to control one set of reheat
valves. The Reheat Expansion Module connects to the MHGRV-X via an E-BUS
communication cable. Connected together, the Reheat Expansion Modules
provide a system that allows the proper control of multiple sets of valves.
N/A
ASM01688
ASM01689
PREHEAT-X and PREHEAT-X-EXT Modules
The PREHEAT-X and PREHEAT-X-EXT are designed to control fixed stages of
Preheat or optional Modulating Preheat to maintain a desired Preheat Leaving
Air Temperature Setpoint. The PREHEAT-X 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 and should only be
used with the approval of AAON. The module directly connects to the VCCX2
Controller or indirectly using an E-BUS Expansion Board via an E-BUS cable.
Page 63
ASM01691
VCC-X EM1 Expansion Module
The EM1 Expansion Module adds Title 24 Economizer Feedback and Chilled
Water applications. It also provides a Duct Static input for Exhaust Fan control,
Return Air Plenum Pressure Control, and Return/Exhaust Proof of Flow. It
provides two analog outputs for controlling a Return Air Bypass Damper and a
Return Damper in Return Air Bypass applications.. It also has five configurable
relay outputs. It connects with an E-BUS cable to the VCCX2 Controller.
Pages
22, 45-48
OVERVIEW
Parts and Descriptions
