G039840-VCCX2-T.pdf

VCCX2 Controller Technical Guide

ASM01698

Software SS1088

VCCX2 Controller Technical Guide 2

This manual is available for download from www.aaon.com

VCCX2 CONTROLLER TECHNICAL GUIDE

REVISION AND DATE CHANGE

Rev. 01N, January 20, 2020 Liquid Line 1-4 Solenoid relay configurations changed to A1,A2,B1,B2 Comp Run Status in relay table and in wiring illustrations

Rev. 01N, January 20, 2020 Added BI: 126 - Exhaust Fan / Return Fan Proof of Flow Alarm

Rev. 01N, February 13, 2020 Added 11 = OA Damper Calibration to BACnet AI:3

Rev. 01N, July 14, 2020 Miscellaneous minor edits

Rev. 01P, October 1, 2020 Added RSMZ module and BACnet parameters

Rev. 01P, October 1, 2020 Added Subcool Monitor Module and BACnet parameters

Rev. 01P, December 11, 2020 10-foot cable changed to 25-foot cable for E-BUS Outdoor Air and Humidity sensors

Rev. 01P, December 11, 2020 Revision to Sump Heater and Sump Drain Enable operation

Rev. 01P, December 11, 2020 Added BACnet AV:94 Sump Drain Override

Rev. 01P, January 21, 2021 Added SIG1 - Return Air Plenum Pressure Sensor and AOUT4 - Modulating Exhaust Damper to VCC-X EM1 Wiring

Rev. Q, March 24, 2021 Updated RSMZ Trendlog tables, updated labels, miscellaneous minor edits

Rev. R, May 26, 2021 Updated BACnet points to latest VCCX2 software, updated Appendix A figures, various cosmetic updates

Rev. S. November 24, 2021 Added information regarding Paragon Air Flow. Edited BACnet table. Corrected errata. Updated formatting.

Rev. T. March 25, 2022 Added information about operation sequences for MUA systems.

Rev. U, January 24, 2024 Added Single Zone VAV Control of High OA Units. Added Direct Fire sequence information. Changes to Low Ambient Operation. Edits to RSMZ BACnet Property Identifier, content reflow, updated template, various cosmetic edits.

Rev. V, February 2, 2024 Added Return Fan Tracking information to sequences

Rev. W, December 13, 2024 Updated Economizer operation, RAT sensor information, added shield wiring schematic, cosmetic edits

Rev. X, December 13, 2024 Updated LCD Screens to include HVAC Override Mode

Rev. Y, December 18, 2024 Updated BACnet values

Rev. Z, January 2, 2025 Updated AV70 description

Rev. AA, January 7, 2025 Updated AV70 description, Economizer Override via BACnet section on page 38

AAON, Inc.

2425 South Yukon Ave.

Tulsa, OK 74107-2728 www.aaon.com Factory Technical Support Phone: 918-382-6450 Controls Support Phone: 866-918-1100 All rights reserved. © JANUARY 2025 AAON, Inc.

It is the intent of AAON to provide accurate and current product information. However, in the interest of product improvement, AAON reserves the right to change pricing, specifications, and/or design of its product without notice, obligation, or liability.

AAON® is a registered trademark of AAON, Inc., Tulsa, OK. BACnet® is a registered trademark of ASHRAE Inc., Atlanta, GA. Copeland Scroll™ is a registered trademark of Emerson Electric Co., Saint Louis, MO. Danfoss VFD® is a registered trademark of Danfoss Commercial Compressors, S.A., Tallahassee, FL. EBTRON® is a registered trademark of Ebtron, Inc., Loris, SC. GreenTrolTM is a registered trademark of GreenTrol Automation, Inc. Loris, SC. Paragon MicroTransEQ Series Airflow Monitoring Station is a registered trademark of Paragon Controls, Inc., Santa Rosa, CA. White-Rodgers® is a registered trademark of Emerson Electric Co., Saint Louis, MO.

VCCX2 Controller Technical Guide 3

TABLE OF CONTENTS

OVERVIEW

Features Applications Part Number Cross Reference VCCX2 Controller Components

DIMENSIONS

VCCX2 Controller VCC-X EM1 Expansion Module 12 Relay E-BUS Module

WIRING

Important Wiring Considerations VCCX2 Controller VCC-X EM1 Expansion Module 12 Relay E-BUS Expansion Module Airflow Station

START-UP AND COMMISSIONING

Powering Up and Configuration

INPUTS AND OUTPUTS

VCCX2 Controller and EM1 Module Inputs/Outputs Maps VCCX2 Controller Inputs/Outputs Descriptions VCC-X EM1 Expansion Module Inputs/Outputs Descriptions User Configurable Relay Outputs

SEQUENCE OF OPERATIONS

Configuration Options Modes of Operation Alarms Trend Logs

TROUBLESHOOTING

LED Diagnostics Temperature Sensor Testing Pressure Sensor Testing

APPENDIX A: SYSTEM CONFIGURATION

Options Stand-Alone System Layout Networked System Single Loop Layout

VCCX2 Controller Technical Guide 4

TABLE OF CONTENTS

Networked System Multiple Loop Layouts

APPENDIX B: LCD SCREENS

LCD Display Screen and Navigation Keys Main Screens Map Screen Descriptions

APPENDIX C: BACNET GUIDE

BACnet Connection to MS/TP Network Analog Inputs Analog Values Binary Inputs Enumerated Fields Bitfields BACnet Protocol Implementation Conformance Statement - VCCX2 v1.90 and previous BACnet Protocol Implementation Conformance Statement - VCCX2 v2.00 and on

VCCX2 Controller Technical Guide 5

TABLE OF FIGURES

FIGURES

VCCX2 Controller Technical Guide 6

TABLE OF TABLES

TABLES

7VCCX2 Controller Technical Guide

OVERVIEW

Features

The VCCX2 Controller is designed with eight analog inputs, four analog outputs, eight binary inputs, and eight relay outputs (seven configurable). It also has an on-board BACnet port for connection to an MS/TP network. The VCCX2 contains a 2 x 8 LCD character display and four buttons that allow for status and alarm display, force modes, and BACnet configuration.

The VCCX2 Controller’s capabilities are expanded with modules including the Refrigerant System Modules (RSM) MHGRV-X, MODGAS, EM1 and 12 Relay Expansion Module.

There are two EBUS expansion ports to allow communication to the modules and sensors.

The VCCX2 Controller provides for the following applications:

constant air volume (CAV), variable air volume (VAV), single zone VAV, make-up air (MUA), dedicated outdoor air system (DOAS), and space temperature control of high percentage outdoor air.

Other features of the VCCX2 include:

(VFD) compressors

SCR electric heat control)

applications

• Airflow monitoring of outdoor air, supply air, return air, and exhaust air streams with approved EBTRON, GreenTrol, or Paragon Airflow MicroTransEQ Monitoring Stations

dehumidification control

other shutdown conditions)

• Drybulb/wetbulb/dewpoint/comparative enthalpy control of economizer operation

BACnet is a registered trademark of ASHRAE.

ASHRAE does not endorse, approve or test products for compliance with ASHRAE standards. Compliance of listed products to the requirements of ASHRAE Standard 135 is the responsibility of BACnet International. BTL is a registered trademark of BACnet International.

8VCCX2 Controller Technical Guide

Applications

Variable Air Volume Unit

Units designed for VAV cooling with VAV boxes are equipped with reheat to satisfy heating demands in individual spaces. In this application, unit heat is used for Morning Warm-Up. The controller can be configured to control the supply fan variable frequency drive to maintain a Duct Static Pressure Setpoint.

VAV units that may require heating operation to “temper” the outdoor air are configured as Supply Air Tempering.

Space Temperature Controlled

Space temperature-controlled units require the space temperature sensor as the mode enabling sensor.

Return Temperature Controlled

Return temperature-controlled units require the return temperature sensor as the mode enabling sensor. This application is used for a VAV voting system.

Space Temperature Control of High Percentage Outdoor Air Units

Units are configured to use the space temperature as the mode enable sensor. When the space temperature is satisfied, the controller will utilize the outdoor air temperature sensor as the mode enable sensor before entering vent mode to avoid dumping unconditioned air into the space.

Single Zone Variable Air Volume

Units are configured to use the space temperature as the mode enable sensor. The supply fan modulates based off of the space temperature for fan energy savings. This application can be configured with high percentage of outdoor air functionality.

Make-Up Air Unit

Units are configured to use the outdoor air temperature as the mode enable sensor. Application assumes unit has return air to allow for unoccupied operations with outdoor air damper closed.

Dehumidification mode utilizes the outdoor air dewpoint.

Dedicated Outdoor Air System

Units are configured to use the outdoor air temperature as the mode enable sensor. Application assumes unit has return air to allow for unoccupied operations with outdoor air damper closed.

Dehumidification mode utilizes the outdoor air dewpoint and resets the coil temperature based off the supply air dewpoint.

HVAC Mode by Binary Inputs

Units are configured as VAV units and use binary inputs to initiate heating, cooling, vent and dehumidification modes of operation.

9VCCX2 Controller Technical Guide

Part Number Cross Reference

PART NUMBER CROSS REFERENCE

PART DESCRIPTION AAON

VCCX2 Controller ASM01698

VCC-X EM1 Expansion Module ASM01691

Refrigerant System Module for VFD Compressors ASM01686

Refrigerant System Module VFD Compressors - Heat Pump ASM01693

Refrigerant System Module for Digital Compressors ASM02201

Refrigerant System Module for VFD Compressors (RSMZ) ASM02351

Subcool Monitor Module ASM02350

12 Relay E-BUS Expansion Module ASM01873

Building Static Pressure Transducer ASM01832

CommLink 5 Communications Interface ASM01874

Duct Static Pressure Transducer and Pickup Tube ASM01640 and ASM02242

Duct Temperature Sensor - 6” or 12” G051240 / G051250

E-BUS Cable Assembly E-BUS Power and Comm

1.5 ft., 3 ft., 10 ft., 25 ft., 50 ft., 75 ft., 100 ft., 150 ft., 250 ft., and 1000 ft. Spool

G029440 (1.5 ft.), G012870 (3 ft.), G029460 (10 ft.), G045270 (25 ft.), G029510 (50 ft.), G029530 (75 ft.), G029450 (100 ft.), G029470 (150 ft.), V36590 (250 ft.), G018870 (SPOOL)

E-BUS Adapter Hub G033970

E-BUS Adapter Hub with 1.5 ft. EBC Cable ASM01635

E-BUS Adapter Board ASM01878

E-BUS CO2 Space Sensor (wall or duct mounted) ASM01829 / ASM01831

E-BUS Digital Room Sensor - LCD - Temp. or Temp and RH ASM01819 / ASM01820

E-BUS Digital Room Sensor - No LCD - Temp and RH ASM02221

E-BUS Horizontal Outdoor Air Temperature and RH Sensor ASM01836

E-BUS Vertical Outdoor Air Temperature and RH Sensor ASM01838

E-BUS Return Air Temperature and RH Sensor ASM01840

E-BUS CO2 Return Air Sensor Emulator Board ASM01623

E-BUS CO2 Space Sensor Emulator Board ASM01622

E-BUS Outdoor Air Temp/RH Sensor Emulator Board ASM01697

E-BUS Return Air Temp/RH Sensor Emulator Board ASM01621

E-BUS Space Temp/RH Sensor Emulator Board ASM01696

GPC-XP Controller ASM01868

IP Module Kit ASM01902

MHGRV-X Module / Reheat Expansion Module ASM01670 / ASM01687

MiniLink Polling Device 5 ASM01626

MODGAS-X Module ASM01668

MODGAS-XWR2 Module ASM01695

Modular Service Tool SD - Operator Interface ASM01895

Modular System Manager SD - Operator Interface ASM01901

Outdoor Air Temperature Sensor G042230

PREHEAT-X Module / PREHEAT-X-EXT Module ASM01688 / ASM01689

Standard Room Sensor - Plain or W/ Override ASM02227 / ASM01638

Standard Room Sensor - with Setpoint Adjust or Setpoint Adjust and Override ASM01642 / ASM01643

Strap-On Temperature Sensor Kit ASM01624

Suction Pressure Transducer ASM02222

10VCCX2 Controller Technical Guide

Part Number Cross Reference

PART NUMBER CROSS REFERENCE

System Manager TS-L (Touch Screen - Limited Access) ASM01900

USB-Link 2 Kit ASM02244

11VCCX2 Controller Technical Guide

VCCX2 Controller Components

Figure 1: VCCX2 Controller Components

12VCCX2 Controller Technical Guide

DIMENSIONS

Figure 2: VCCX2 Controller Dimensions

13VCCX2 Controller Technical Guide

VCC-X EM1 Expansion Module

Figure 3: VCC-X EM1 Expansion Module Dimensions

14VCCX2 Controller Technical Guide

12 Relay E-BUS Module

Figure 4: 12 Relay E-BUS Module Dimensions

15VCCX2 Controller Technical Guide

WIRING

Important Wiring Considerations

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 installed and wired at the AAON factory. It is also possible to purchase these controllers through a local AAON representative for installation in the field.

Some of the following information pertains to field wiring and may not apply to the 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 field wired.

Controller Mounting

When the controller is to be field 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 three 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% relative humidity 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.

WARNING: When using a single transformer to power multiple controllers or expansion modules, the correct polarity must always be maintained between the boards. Failure to observe correct polarity will result in damage to the controller and expansion modules.

Please carefully read and apply the following information when wiring the VCCX2 Controller, RSMs, and expansion modules.

• All wiring is to be in accordance with local and national electrical codes and specifications.

• 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.

sensors require two-conductor wire, and some require three-or four-conductor wire.

• The minimum wire size for 24 VAC thermostat wiring is 22-gauge.

• Be sure 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.

• When communication wiring is to be used to connect VCCX2 Controllers together or to connect to other communication devices, all wiring must be plenum-rated, minimum 18-gauge, two-conductor, twisted pair with shield. AAON can supply communication wire that meets this specification and is color coded for the network or local loop. If desired, Belden #82760 or equivalent wire may also be used.

• Before applying power to the VCCX2 Controller, recheck all wiring connections and terminations thoroughly.

Powering Up

When the VCCX2 and connected modules are first powered up, the POWER LED should light up and stay on continuously. If it does not light up, verify the 24 VAC is connected to the controller, the wiring connections are tight, and they are wired for the correct polarity.

The 24 VAC power must be connected so 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.

WIRING DETAILS

Control Device Voltage VA

Load Temp Humidity

(Non-Condensing) VCCX2 Controller 18-30 VAC 15 -22°F to 158°F 0-95% RH

Evaporative Condenser, RSMD, RSMV, RSMV-HP, RSMZ Refrigerant System Modules and 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

16VCCX2 Controller Technical Guide

Figure 5: VCCX2 Controller Input Wiring

17VCCX2 Controller Technical Guide

VCCX2 Controller

Outputs

Figure 6: VCCX2 Controller Output Wiring

18VCCX2 Controller Technical Guide

VCC-X EM1 Expansion Module

The VCC-X EM1 Expansion Module connects to the VCCX2 Controller with an E-BUS cable and adds an additional five analog inputs, five analog outputs, three binary inputs, and five configurable relay outputs.

The VCC-X EM1 Expansion Module can be used in conjunction with the E-BUS 12 Relay Expansion Module. The expansion modules can be used individually or together to provide the required inputs and outputs for the specific applications.

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 will result in damage to the VCCX2 Controller or Return Air Plenum Pressure Sensor.

Figure 7: Entering Water Temperature Sensor, Return Air Plenum Pressure and Return/Exhaust Proof of Flow

Figure 8: Direct Fire Wiring

19VCCX2 Controller Technical Guide

VCC-X EM1 Expansion Module

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 9: VCC-X EM1 Exhaust Duct Static Pressure and Economizer Actuator Feedback Wiring

20VCCX2 Controller Technical Guide

VCC-X EM1 Expansion Module

Outputs

The VCC-X EM1 Expansion Module must be connected to 24VAC as shown in the wiring diagram below. Please see Table 1, page 15, for correct VA requirements to use when sizing the transformer(s) used for powering the expansion module.

Also, please note that when wiring the VCC-X EM1 Expansion Module, its contacts must be wired as wet contacts (connected to

24VAC).

See Figure 10, this page, for output wiring.

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 10: VCC-X EM1 Expansion Module Output Wiring

21VCCX2 Controller Technical Guide

12 Relay E-BUS Expansion Module

The ASM01873 12 Relay E-BUS Expansion Module provides 12 dry contact configurable relay outputs. See Figure 11, this page, for complete wiring details.

The 12 Relay E-BUS Expansion Module can be used in conjunction with the VCC-X EM1 Expansion Module. The expansion modules can be used individually or together to provide the required inputs and outputs for the specific applications.

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 11: 12 Relay E-BUS Expansion Module Wiring

22VCCX2 Controller Technical Guide

Airflow Station

The E-BUS Adapter Board attaches to the VCCX2 Controller with an E-BUS cable. The Adapter Board is used for connecting the EBTRON, GreenTrol, or Paragon Airflow Measurement Digital Transmitter to the VCCX2 Control System. Wire the airflow Measurement Digital Transmitter to the adapter board as shown in Figure 12, this page.

Up to four EBTRON, GreenTrol, or Paragon MicroTransEQ Airflow Measurement Digital Transmitters can be attached to each Adapter Board. Only one Paragon Multi-Trans Smart Ecosystem (MTSE) can be attached.

Only the EBTRON GTC116 or HTN104 series, GreenTrol GA- 200-N Module (with GF series Airflow Station), or Paragon MicroTransEQ series of MODBUS RTU transmitters are compatible with the VCCX2 Controller. No other series of transmitters will work for this application. Contact AAON Controls for information on other airflow station options.

The Airflow Station’s baud rate needs to be set to 19,200 in order to communicate with the VCCX2 Controller (excludes Paragon

MTSE).

When configuring the GTC116 or HTN104 Series, be sure to set the parity to “NO PARITY, 1 STOP BIT.”

Paragon MTSE must be configured for MODBUS communication with baud rate set to 57,600 and its MODBUS ID set to “9”.

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.

23VCCX2 Controller Technical Guide

START-UP AND COMMISSIONING

Powering Up and Configuration

Before Applying Power

In order to have a trouble free start-up, it is important to follow a few simple procedures. Before applying power for the first time, it is very important to run through a few simple checks.

Power Wiring

One of the most important checks to make before powering up the system for the first time is to confirm proper voltage and transformer sizing for each controller. Each VCCX2 Controller requires 15 VA of power delivered to it at 24 VAC. Use separate transformers for each device (preferred) or power several devices from a common transformer.

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.

Check all wiring leads at the terminal block for tightness. Be sure that wire strands do not stick out and touch adjacent terminals.

Confirm all sensors required for the system are mounted in the appropriate location and wired into the correct terminals on the VCCX2 Controller.

After all the above wiring checks are complete, apply power to the VCCX2 Controller.

Configuring the Controller

The next step is configuring the controller for specific requirements.

In order to configure the VCCX2 Controller, use an operator interface. Four different operator interfaces are available for programming and monitoring of the VCCX2 Controller. See Figure 13, this page. They are as follows:

Any of these devices or a combination of them can be used to access the status, configuration, and setpoints of any controller on the communications loop.

NOTE: Use Prism II to configure units with RSMD-A, RSMVHPQ and RSMZ modules.

If using the Modular Service Tool SD or the Modular System Manager SD for programming, refer to the VCCX2 Controller Operator Interface SD Technical Guide. If using a computer and the Prism 2 software for programming, refer to the Prism 2 Technical Guide.

If using the System Manager TS-L for monitoring, please see the System Manager TS-L Technical Guide.

No matter which operator interface is used, AAON recommends proceeding with the programming and setup of the VCCX2 Controller in the order that follows:

Configure the controller for the application.

operation and correct controller configuration.

NOTE: For BACnet Configuration, see Appendix C.

Figure 13: Operator Interfaces

24VCCX2 Controller Technical Guide

INPUTS AND OUTPUTS

VCCX2 Controller and EM1 Module Inputs/Outputs Maps

Refer to the respective module technical guides for specific input and output tables.

VCCX2 Controller

Inputs

ANALOG INPUTS (AI)

INPUT NAME

AI1 Space Temperature

AI2 Space Slide Adjust

AI3 Supply Air Temperature

AI4 Return Air Temperature

AI5 Building Pressure

AI6 Supply Air Temperature Reset

AI7 Outdoor Air Temperature

AI8 Not connected – use Duct Static Pressure Connector (Duct Static Jack)

Table 2: VCCX2 Controller Analog Inputs

BINARY INPUTS (BI)

INPUT NAME

BI1 Proof of Airflow

BI2 Dirty Filter

BI3 Hood On/Off

BI4 Remote Forced Occupied

BI5 Remote Forced Cooling

BI6 Remote Forced Heating

BI7 Remote Forced Dehumidification

BI8 Emergency Shutdown

Table 3: VCCX2 Controller Binary Inputs

Outputs

ANALOG OUTPUTS (AO) (0-10 VDC)

OUTPUT NAME

AO1 Main Supply Fan VFD or Bypass Damper

AO2 Economizer (Outdoor Air Damper) or Waterside Economizer Actuator

AO3 Modulating Heating (Hot Water, Steam, or SCR)

AO4 Exhaust Fan VFD / Building Pressure Control Signal

Table 4: VCCX2 Controller Analog Outputs

RELAY OUTPUTS (RLY) (24 VAC)

OUTPUT NAME

RLY1 Fan Relay

RLY2 Configurable Relay

RLY3 Configurable Relay

RLY4 Configurable Relay

RLY5 Configurable Relay

RLY6 Configurable Relay

RLY7 Configurable Relay

RLY8 Configurable Relay

Table 5: VCCX2 Controller Relay Outputs

The following E-BUS sensors and modules are available to connect to the VCCX2 Controller via E-BUS ports or E-BUS Expansion Modules:

• E-BUS Digital Room Sensor - LCD Display - Temp Only or Temp and Humidity

• E-BUS Digital Room Sensor - No LCD Display - Temp and Humidity

airflow stations

25VCCX2 Controller Technical Guide

VCCX2 Controller and EM1 Module Inputs/Outputs Maps

EM1 Expansion Module

Inputs

ANALOG INPUTS (AI)

INPUT NAME

T1 Entering Water Temperature Sensor

T2 Mixed Air Temperature sensor

SIG1 Return Air Plenum Pressure (0-5V)

SIG2 Economizer Damper Midway Switch (5VDC)

SIG3 Economizer Actuator Feedback (0-5 or 0-10 V)

DUCT

STATIC

JACK

Exhaust Duct Static Pressure (Duct Static Jack)

Table 6: VCC-X EM1 Expansion Module Analog Inputs

BINARY INPUTS (BI)

INPUT NAME

BI1 Return/Exhaust Proof of Flow

BI2 Direct Fire Status Signal (24VAC)

BI3 Direct Fire Alarm Signal (24VAC)

Table 7: VCC-X EM1 Expansion Module Binary Inputs

Outputs

ANALOG OUTPUTS (0-10 OR 2-10 VDC)

OUTPUT NAME

AO1 Chilled Water Valve

AO2 Return Air Damper

AO3 Return Air Bypass Damper

AO4 Motorized Exhaust Damper

Table 8: VCC-X EM1 Expansion Module Analog Outputs

RELAY OUTPUTS (24 VAC)

OUTPUT NAME

RLY1 Configurable Relay

RLY2 Configurable Relay

RLY3 Configurable Relay

RLY4 Configurable Relay

RLY5 Configurable Relay

Table 9: VCC-X EM1 Expansion Module Relay Outputs

26VCCX2 Controller Technical Guide

VCCX2 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 configured 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 configured 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-configured maximum amount.

If the space temperature is configured 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-configurable 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 configured 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 configuring the VCCX2 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 configure 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 configured as the reset source, this input can be used to accept a configurable 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 configured for CAV operation, this sensor is optional. If it is installed on a CAV unit, it can be used for filter loading VFD control or used for a status-only reading.

Binary Inputs BI1 - Proof of Flow Input A proof of flow 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 flow 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 filter status indication and requires a differential pressure switch to initiate a dirty filter alarm.

BI3 - Hood On/Off Input When this wet contact input closes (hood on), the VCCX2 Controller switches from indoor air control to outdoor air control. This is typically used on CAV applications requiring CAV/MUA Dual Damper (Hood On/Off) Modes.

BI4 - Remote Forced Occupied Mode Input When this wet contact input closes, it forces the VCCX2 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 configured or is in effect when this occurs.

27VCCX2 Controller Technical Guide

VCCX2 Controller Inputs/Outputs Descriptions

BI5 - Remote Forced Cooling Mode Input A wet contact closure on this input is used to provide a means for another building automation system or control device (by others) to force the unit into Cooling Mode.

BI6 - Remote Forced Heating Mode Input A wet contact closure on this input is used to provide a means for another building automation system or control device (by others) to force the unit into Heating Mode.

BI7 - Remote Forced Dehumidification Input A wet contact closure on this input is used to provide a means for another building automation system or control device (by others) to force the VCCX2 Controller into Dehumidification Mode.

NOTE: If remote forced operation is used, it must apply to Cooling, Heating, and Dehumidification. The unit must be configured for Mode Set By Remote Contact.

BI8 - Emergency Shutdown Input This wet contact input is used to initiate shutdown of the HVAC unit when a normally closed smoke detector (by others), firestat (by others), or other shutdown condition (by others) contact is opened.

The controller remains active and can initiate alarm relays.

NOTE: The binary inputs require wet contacts (24 VAC only) to recognize an active input. If only dry contacts are provided, the contact closure is not be recognized. All binary inputs are optional. This means the VCCX2 Controller must be configured to recognize these input signals.

Analog Outputs AO1 - Main Supply Fan VFD Control Signal or Bypass Damper Control Signal This user-adjustable voltage signal is used to modulate the supply fan VFD in VAV, single zone VAV, filter loading applications, or reverse acting building pressure control using the VFD. In a volume and variable temperature zoning application, this output is used to control a bypass damper.

AO2 - Outdoor Air Damper Economizer Control Signal or Waterside Economizer Valve Signal Outdoor Air Damper Economizer Control Signal This user-adjustable voltage signal is used to control the outdoor air damper during economizer operation. It is also used to maintain the outdoor air damper at its minimum position during Occupied Mode when the outdoor air temperature is not suitable for economizer cooling purposes. This minimum position can be reset based on CO2 override conditions.

This output is also used to control the outdoor air damper based on an Outdoor Airflow Setpoint if using an outdoor airflow monitoring station. This position can be overridden during economizer control.

Finally, this output can be used to control the outdoor air damper during reverse acting building pressure control to maintain a Building Pressure Setpoint.

Waterside Economizer Valve Signal This 2-10 VDC signal is used to modulate the waterside economizer valve during waterside economizer operation.

AO3 - Modulating Heat Control Signal This output can be configured with a user-adjustable voltage range of operation which can be set up to provide either a direct or reverse acting operation. This output is used to operate a Modulating Heating Device to maintain the Heating Supply Air Setpoint during the Heat Mode of operation.

AO4 - Exhaust Fan VFD Signal / Building Pressure Control Signal This user-adjustable voltage signal is used to provide direct acting building pressure control using an exhaust fan VFD or a modulating exhaust damper.

NOTE: For reverse acting building pressure control using the outdoor air damper or supply fan VFD, the VCCX2 Controller uses the outputs specific to those devices.

On the main VCCX2 Controller, AO2 controls the outdoor air damper and AO1 controls the supply fan VFD to maintain the Building Pressure Setpoint.

Alternatively, this AO4 output will mirror those outputs and can be used as well.

Relay Outputs RLY1 - Supply Fan (Enable) This is a non-configurable output.

RLY2-RLY8 - User-Configurable Relays These relays are configurable by the user. See Table 10, page 29.

28VCCX2 Controller Technical Guide

VCC-X EM1 Expansion Module Inputs/Outputs Descriptions

Analog Inputs T1 - Entering Water Temperature Sensor Input The entering water is used to determine when to initiate waterside economizer operation. If the unit is in Cooling Mode and the entering water temperature drops 10˚F (adjustable) below the entering air temperature, the unit modulates the waterside economizer valve as part of the Cooling operation.

T2 - Mixed Air Temperature sensor Input Used for direct fire, requires a 10k Type III Sensor. Note the actual sensor is an array of four sensors wired in a parallel/series configuration to look like a single sensor.

SIG1 - Return Air Plenum Pressure Sensor Input The sensor is only required when controlling a motorized exhaust damper to maintain the Return Air Plenum Pressure Setpoint.

SIG2 – Economizer Damper Midway Switch On units using Direct Fire, this is the status input of the OA damper midway switch.

SIG3 - Economizer Feedback If economizer operation has been configured, this input will be used for the 2-10 VDC feedback signal from the economizer actuator.

Exhaust Duct Static Pressure Sensor Input This jack-style input connection accepts a Duct Static Pressure Sensor modular connector input used for exhaust duct static pressure control. This static pressure reading is used to control the output signal (AO4 on the VCCX2 Controller) supplied to the exhaust fan VFD.

Binary Inputs BI1 - Return/Exhaust Proof of Flow A proof of flow switch that provides a wet contact closure whenever the HVAC unit return fan or exhaust fan is operating can be connected to this input.

BI2 – Direct Fire Status Signal Used for direct fire. A 24VAC signal from a direct fire controller is sent to indicate direct fire is active.

BI3 – Direct Fire Alarm Signal Used for direct fire. A 24VAC signal is sent if there is an active alarm on the direct fire controller.

Analog Outputs AO1 - Modulating Chilled Water Valve Actuator This output is used to control a modulating chilled water valve actuator to maintain the Cooling Supply Air Temperature Setpoint.

This output provides a 0-10 or 2-10 VDC direct acting signal.

AO2 - Return Air Damper Actuator Signal This output signal is a direct acting 2-10 VDC output signal that is used to modulate a return air damper actuator in conjunction with a Return Air Bypass Damper actuator for AAON Precise Air Control or Digital Precise Air Control applications.

AO3 - Return Air Bypass Damper Actuator Signal This output signal is a direct acting 2-10 VDC output signal that is used to modulate a Return Air Bypass Damper actuator in conjunction with a return air damper actuator for AAON Precise Air Control or Digital Precise Air Control applications.

AO4 - Motorized Exhaust Damper Actuator Signal This output signal is a direct…