AAON Orion VCCX2 User Manual

48
VCCX2 Controller Technical Guide
Return Air Bypass
The VCCX2 Controller can be congured 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 7 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 congured 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: It is very important to be certain that all
wiring is correct as shown in the wiring
diagram below. Failure to observe the
correct polarity could result in damage to
the Damper Actuator or the VCC-X EM1
Expansion Module.
WARNING: Observe Polarity! All boards must be
wired with GND-to-GND and 24VAC-to-
24VAC. 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
CONTAC T
RATING IS 1AMP
MAX @ 24 VA C
R1
R2
R3
R4
R5
RELAYOUTPUT
TERMINALS
ANALOG OUTPUT TERMINALS
GND
NOT USED
NOT USED
RETURN DAMPER
RETURN BYPA SS
CHILLED WATER
NOT USED
E-BUS
CONNECT
24 VA C POWER
ONLY
WARNING!
POLARITY
POWER INPUT
TERMINAL BLOCK
VCC-X E EXPANSIONM1
AAON P/N: ASM01691
LABELP/N:
G040660
RC
VCC-X EM1
Expansion Module
AOUT2
18-30 VAC
GND
Line Voltage
Size transformer for
correct total load.
VCC-X E1 Module = 5 VAM
GND
AOUT3
2+
Y13
COM1
2+
Y13
COM1
BelimoActuator wiring
shown. Consult factory
for other manufacturer
wiring instructions.
Damper Actuator
Return Air
Return Air Bypass
Damper Actuator
WIRING
Return Air Bypass

AAON Orion VCCX2 Specifications

General

Brand	AAON
Model	Orion VCCX2
Category	Controller
Language	English