AAON VCCX-IP User Manual

26VCCX-IP Controller Technical Guide
INPUTS AND OUTPUTS
VCCX-IP Controller Inputs/Outputs Descriptions
Analog Inputs
AI1 - Space Temperature Sensor Input
The Space Temperature Sensor initiates Occupied Heating and
Cooling Modes if the unit is congured for space temperature
control. It is always the sensor used to initiate Unoccupied Heating
and Cooling Modes. If the Space Temperature Sensor used is
equipped with the optional push-button override feature, this input
detects user overrides and switches the unit from the Unoccupied
Mode back to the Occupied Mode operation for a user-adjustable
amount of time. The space temperature can also be congured to
reset the Supply Air Temperature Setpoint.
AI2 - Space Temperature Sensor Slide Adjust
If the Space Temperature Sensor being used has the optional slide
adjust feature, its AUX output is connected to this input. The slide
adjust control is used to vary the HVAC Mode Heating and Cooling
Setpoints by a user-congured maximum amount.
If the space temperature is congured as the supply air temperature
reset source, the slide adjustment adjusts both the HVAC
Mode Enable Heating and Cooling Setpoints and the Supply
Air Temperature Reset Source Heating and Cooling Setpoints
simultaneously by a user-congurable maximum amount.
AI3 - Supply Air Temperature Sensor Input
Once the unit is in the Heating or Cooling Mode (based on the
temperature at the mode enable sensor), the unit controls the staging
or modulation of the heating or cooling sources to maintain a heating
or cooling Supply Air Temperature Setpoint. The HVAC unit must
always have a Supply Air Temperature Sensor installed.
AI4 - Return Air Temperature Sensor Input
To generate occupied heating and cooling demands based on return
air temperature, select this sensor as the HVAC Mode Enable Sensor.
The Return Air Temperature Sensor is also used to initiate or cancel
the morning warm-up/cool-down period on VAV congured units.
If the Return Air Temperature Sensor is connected, the outdoor air
temperature must be at least 5°F below the return air temperature
to allow economizer cooling operation.
AI5 - Building Static Pressure Sensor Input
This sensor is only required if conguring the VCCX-IP Controller
for building pressure control. Building pressure control can be
accomplished by using one of two main control methods. One
control method uses the 0-10 VDC signal to control an exhaust
fan VFD or an exhaust damper actuator for direct acting pressure
control applications. In addition, for reverse acting pressure control
applications, it can control an outdoor air damper actuator (or in
certain cases, the VFD supply fan). The other available control
method is to congure one of the output relays as an exhaust fan
output that activates the exhaust fan any time the building pressure
is above the Building Pressure Setpoint.
AI6 - Remote Supply Air Temperature Reset Signal
If a remote supply air temperature reset signal is congured as the
reset source, this input can be used to accept a congurable voltage
input between 0-10 VDC (direct or reverse acting) to reset the
Supply Air Temperature Setpoint.
AI7 - Outdoor Air Temperature Sensor Input
To conserve energy, the outdoor air temperature is used to lock out
heating or cooling at set temperatures for each Mode of Operation.
This sensor is also used to initiate Heating and Cooling Modes on
a make-up air unit. The Outdoor Air Temperature Sensor can also
be used for preheater operation and for low ambient protection
operation.
NOTE: For AI1, AI3, AI4 and AI7, all temperature sensors
must be Thermistor Type III which provide 77.0°F
@ 10K ohms resistance.
AI8 - Supply Duct Static Pressure Sensor Input
This jack-style input connection accepts a Duct Static Pressure
Sensor modular cable input. The Duct Static Pressure Sensor reading
is used to determine current duct static pressure. This static pressure
reading is used to control the output signal supplied to the supply
fan VFD or zoning bypass damper actuator. If the HVAC unit is
congured for CAV operation, this sensor is optional. If it is installed
on a CAV unit, it can be used for lter loading VFD control or used
for a status-only reading.
Binary Inputs
BI1 - Proof of Flow Input
A proof of ow switch (by others) that provides a wet contact closure
whenever the HVAC unit supply fan is operating can be connected to
this input. If the proof of ow switch contact opens while the supply
fan is operating, all heating and cooling is suspended or disabled.
BI2 - Dirty Filter Contact Closure Input
This wet contact input is required for lter status indication and
requires a dierential pressure switch to initiate a dirty lter alarm.
BI3 - Hood On/O󰀨 Input
When this wet contact input closes (hood on), the VCCX-IP
Controller switches from indoor air control to outdoor air control.
This is typically used on CAV applications requiring CAV/MUA
Dual Damper (Hood On/O) Modes.
BI4 - Remote Forced Occupied Mode Input
When this wet contact input closes, it forces the VCCX-IP Controller
into the Occupied Mode. When the remote forced occupied signal
is removed, the controller reverts to the Unoccupied Mode of
operation if no internal or external schedule has been congured
or is in eect when this occurs.

AAON VCCX-IP Specifications

General

Brand	AAON
Model	VCCX-IP
Category	Controller
Language	English