AAON MODGAS-XWR - BUS Expansion Board Wiring

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MODGAS-XWR2 Technical Guide
STAND-ALONE WIRING
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12 Relay E-BUS Expansion Module - Stand Alone
12 Relay E-BUS Expansion Module
The 12-Relay E-BUS Expansion Module can be used to provide addi-
tional xed heat stages for all Stand-Alone wiring. See Figure 8, below.
In order for the 12 Relay E-BUS Expansion Module to operate, the Stand-
Alone setting in the LCD Conguration Screens must be set to Forced.
If communication is lost to the 12-Relay E-BUS Expansion Module,
the 12-Relay E-BUS Expansion Module will turn o its relays and the
MODGAS-XWR2 Controller will alarm and fall back to using only its
onboard stages. If communications is restored, the MODGAS-XWR2
Controller will begin staging up if needed.
Figure 8: Stand-Alone - 12-Relay E-BUS Expansion Module