Orion System VCC-X Controller - Manual (Page 19)

VCC-X Controller Technical Guide
VCC-X CONTROLLER WIRING
19
WARNING: When using a single transformer to power more
than one controller or expansion module, the
correct polarity must always be maintained be-
tween the boards. Failure to observe correct
polarity will result in damage to the VCC-X
Controller and expansion modules.
Please carefully read and apply the following information when
wiring the VCC-X Controller, RSMV, and the Expansion Modules.
1. All wiring is to be in accordance with local and national
electrical codes and specifi cations.
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 intercon-
nect VCC-X Controllers together or to connect to other
communication devices, all wiring must be plenum-
rated, minimum 18-gauge, 2-conductor, twisted pair with
shield. WattMaster can supply communication wire that
meets this specifi cation and is color coded for the
network or local loop. Please consult your WattMaster
distributor for information. If desired, Belden #82760 or
equivalent wire may also be used.
8. Before applying power to the VCC-X Controller,
be sure to recheck all wiring connections and
terminations thoroughly.
Powering Up
When the Controller and Modules are fi 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 WattMaster Controls
Technical Support for assistance.
Important Wiring Considerations
General
Correct wiring of the VCC-X Controller is the most important
factor in the overall success of the controller installation process. In
general, most VCC-X 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 fi eld. Some of the following information pertains to fi 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 fi eld wired.
Controller Mounting
When the controller is to be fi 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 for a list of
the required operating conditions for the VCC-X Controller and
associated expansion modules.
The VCC-X Controller is housed in a plastic enclosure. It is designed
to be mounted by using the 3 mounting holes in the enclosure base.
The VCC-X Controller needs to be installed in an environment
which can maintain a temperature range between -30°F and 150°F
not to exceed 90% RH levels (non-condensing). Be careful not to
damage the electronic components when mounting the controller.
Wiring
The VCC-X 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.
Contr
ol
De
vice
V
olta
ge
V
A
Load
Temper
atur
e
Humidity
(Non-
Condensing)
OE338-26B-VCCX-
VCC-X Controller
24VAC 15
-30°F to
150°F
90% RH
OE370-26-RSMV
Refrigerant System
Module - VFD
24VAC 18
-30°F to
150°F
90% RH
OE336-23-VCCXEM1 24VAC 5
-30°F to
150°F
90% RH
OE358-23E-12R-A 24VAC 15
-30°F to
150°F
90% RH
Table 1: Voltage and Environment Requirements