48
VCCX2 Controller Technical Guide
Return Air Bypass
The VCCX2 Controller can be congured for AAON
®
Return Air
Bypass applications. These provide improved moisture removal
capabilities while utilizing internal space loads for reheat by
redirecting Return Air around the Evaporator Coil instead of
through the coil. See the AAON
®
Return Air Bypass application
section of this manual on page 10 for complete operation details.
The AAON
®
Return Air Bypass applications utilize a Return
Air Bypass Damper Actuator and a Return Air Damper Actuator
to modulate the Return Air and Return Air Bypass Dampers to
control the amount of air that is redirected around the Evaporator
Coil.
The output is congured for 2-10 VDC direct acting operation.
See Figure 29, this page for detailed wiring of the Return Air
Bypass and Return Air Damper Actuators.
WARNING: Observe Polarity! All boards must be
wired with GND-to-GND and 24 VAC-
to-24 VAC. Failure to observe polarity
will result in damage to one or more of the
boards. Expansion modules must be wired
in such a way that the expansion modules
and the controller are always powered
together. Loss of power to the expansion
module will cause the controller to become
inoperative until power is restored to the
expansion module.
Figure 29: Return Air Bypass Wiring
+24 VAC
GND
RELAY
CONTACT
RATING IS 1 AMP
MAX @ 24 VAC
R1
R2
R3
R4
R5
RELAYOUTPUT
TERMINALS
ANALOG OUTPUT TERMINALS
GND
NOTUSED
NOTUSED
RETURN DAMPER
RETURN BYPA SS
CHILLED WATER
EXH. DAMPER
E-BUS
CONNECT
24 VAC POWER
ONLY
WARNING!
POLARITY
POWER INPUT
TERMINALBLOCK
VCC-XE EXPANSIONM1
AAON P/N: ASM01691
LABELP/N:
G040660
RC
VCC-XEM1
Expansion Module
18-30VAC
GND
Size transformerfor
correct total load.
VCC-XE 1 Module =5 VAM
2+
Y13
COM1
2+
Y13
COM1
Belimo Actuator wiring
shown. Consultfactory
forother manufacturer
wiring instructions.
Damper Actuator
Return Air
Return Air Bypass
Damper Actuator
WIRING
Return Air Bypass
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