24
VCCX2 Controller Technical Guide
General
Correct wiring of the VCCX2 Controller is the most important
factor in the overall success of the controller installation process.
In general, most VCCX2 Controllers are factory installed and
wired at the AAON
®
factory. It is also possible to purchase these
controllers through your local AAON
®
/Orion representative
for installation in the eld. Some of the following information
pertains to eld wiring and may not apply to your installation if
it was pre-wired at the factory. However, if troubleshooting of
the controller is required, it is a good idea to be familiar with the
system wiring, no matter if it was factory or eld wired.
Controller Mounting
When the controller is to be eld mounted, it is important to
mount the controller in a location that is free from extreme high
or low temperatures, moisture, dust, and dirt. See Table 1, this
page for a list of the required operating conditions for the VCCX2
Controller and associated expansion modules.
The VCCX2 Controller is housed in a plastic enclosure. It is
designed to be mounted by using the 3 mounting holes in the
enclosure base. The VCCX2 Controller needs to be installed in
an environment which can maintain a temperature range between
-22°F and 158°F not to exceed 95% RH levels (non-condensing).
Be careful not to damage the electronic components when
mounting the controller.
Wiring
The VCCX2 Controller and expansion modules must be
connected to a 24 VAC power source of the proper size for the
calculated VA load requirements. All transformer sizing should
be based on the VA rating listed in Table 1, this page.
Please carefully read and apply the following information when
wiring the VCCX2 Controller, RSMs, and the Expansion Module.
1. All wiring is to be in accordance with local and
national electrical codes and specications.
2. All 24 VAC wiring must be connected so that all
ground wires remain common. Failure to follow this
procedure can result in damage to the controller and
connected devices.
3. Minimum wire size for 24 VAC wiring should be
18-gauge.
4. Minimum wire size for all sensors should be 24-gauge.
Some sensors require 2-conductor wire and some
require 3-or 4-conductor wire.
5. Minimum wire size for 24 VAC thermostat wiring
should be 22-gauge.
6. Be sure that all wiring connections are properly
inserted and tightened into the terminal blocks. Do
not allow wire strands to stick out and touch adjoining
terminals which could potentially cause a short circuit.
7. When communication wiring is to be used to
interconnect VCCX2 Controllers together or
to connect to other communication devices, all
wiring must be plenum-rated, minimum 18-gauge,
2-conductor, twisted pair with shield. AAON
can supply communication wire that meets this
specication and is color coded for the network or
local loop. Please consult your AAON distributor for
information. If desired, Belden #82760 or
equivalent wire may also be used.
8. Before applying power to the VCCX2 Controller,
be sure to recheck all wiring connections and
terminations thoroughly.
Powering Up
When the Controller and Modules are rst powered up, the
POWER LED should light up and stay on continuously. If it does
not light up, check to be sure that you have 24 VAC connected
to the controller, that the wiring connections are tight, and that
they are wired for the correct polarity. The 24 VAC power must
be connected so that all ground wires remain common. If after
making all these checks, the POWER LED does not light up,
please contact AAON Controls Support for assistance.
Control
Device
Voltage
VA Load
Temperature
Humidity
(Non-
Condensing)
VCCX2 Controller
18-30
VAC
15
-22°F to
158°F
0-95%
RH
RSMD, RSMV, RSMV-HP,
RSMZ Refrigerant System
Modules & Subcool Monitor
18-30
VAC
18
-22°F to
158°F
0-95%
RH
VCCX EM1
Expansion Module
18-30
VAC
5
-22°F to
158°F
0-95%
RH
12 Relay E-BUS
Expansion Module
18-30
VAC
15
-22°F to
158°F
0-95%
RH
Table 1: Voltage and Environment Requirements
WARNING: When using a single transformer to power
multiple controllers or expansion modules,
the correct polarity must always be main-
tained between the boards. Failure to observe
correct polarity will result in damage to the
controller and expansion modules.
WIRING
Important Wiring Considerations
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