VERASYS VEC100 Generic RTU Controller, Staged Heating and Staged Cooling User Guide

: June 6, 2024
: VERASYS

Table of Contents

About this guide
Mounting the controller
Wiring the controller
Sensor bus terminal blocks
Setting the VEC address using the local display
Configuring sensors
Updating the VEC
COBP wiring diagram
VAV wiring diagram
Commissioning the system
Software terms
Contact information
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VEC100 Generic RTU Controller, Staged Heating
and Staged Cooling Quick Start Guide
LIT-12013486
2021-07-14

About this guide

This quick start guide provides the basic information you need to configure and install the Verasys® Equipment Controller (VEC), LC-VEC100-0, using the Verasys generic rooftop unit (RTU) staged heating and staged cooling controller application. The application controls a third-party changeover bypass (COBP) system or a third-party variable air volume (VAV) unit.
For further information, refer to the Versys Equipment Controller (VEC) Installation Guide (24-10143-1272) and the VEC100 Generic RTU Controller, Staged Heating and Staged Cooling Application Note (12013443).
Table 1: Application features

Options available	Possible values

Number of Heating

Stages Installed

| 0 to 2
Number of Cooling

Stages Installed

| 0 to 4
Economizer Installed| •State 0: the economizer is not available.

• State 1: the economizer is available.

Air Proving Switch Setup| • State 0: fan status device

• State 1: duct static pressure sensor

•State 2: none

Rooftop Controller Type| •State 0: changeover bypass

•State 1: VAV

Cancel ASCD Timers| • State 0: false

•State 1: true

Demand Ventilation Feature| •State 0: demand ventilation is off.

•State 1: demand ventilation is on.

Mounting the controller

To mount the controller, complete the following steps:
1. Mount a 20 cm (8 in.) section of 35 mm (1.3 in.) DIN rail horizontally.
Note: Mount the controller in the horizontal position.
2. On the back of the controller, extend the two mounting clips.

Figure 1: Pull down lower mounting clips

3. Place the controller on the DIN rail.
4. Push the bottom mounting clips inward (up) to secure the controller on the DIN rail.
Figure 2: Push up lower mounting clips

Wiring the controller

Zone bus terminal block
The zone bus terminal block is a grey, removable, 4terminal plug that fits into a board-mounted jack. Wire the removable zone bus terminal block plugs on the controller on the top row of the stacked connector, and other field controllers in a daisy-chain configuration using a 3-wire twisted, shielded cable as shown in the following figure.

Figure 3: Zone bus terminal block wiring

Table 2: Zone bus daisy-chaining configuration

1	Terminating device on the zone bus
2	Zone bus terminal block plugs
3	Daisy-chained devise on a zone bus segment
4	Connects to the next device on the zone bus.

Note: The zone bus shield (SHD) terminal is isolated and can be used to connect (daisy chain) the shields for zone bus wiring.

Sensor bus terminal blocks

The sensor bus terminal block is a brown, removable, 4terminal plug that fits into a board-mounted jack. Wire the removable sensor bus terminal block plugs on the lower part of the dual-stacked connector to the controller, and other sensor bus devices in a daisy-chain configuration using a 4-wire twisted, shielded cable as shown in the following figure.

Figure 4: Sensor bus terminal block wiring

Table 3: Sensor bus daisy-chaining configuration

1	Terminating device on the sensor bus
2	Sensor bus terminal block plug on the terminating device
3	Daisy-chained devise on a sensor bus segment
4	Sensor bus terminal block plug on the daisy-chained device
5	Cable shield connection
6	Connects to the next device on the sensor bus.

Note: The PWR terminal supplies 15 VDC. The PWR terminal can be used to connect (daisy chain) the 15 VDC power leads on the sensor bus.

Supply power terminal block
The 24 VAC supply power terminal block is a gray, removable, 3-terminal plug that fits into a board-mounted jack on the top right of the controller. Wire the 24 VAC supply power wires from the transformer to the HOT and COM terminals on the terminal plug, as shown in the following figure. The middle terminal on the supply power terminal block is not used.
Figure 5: 24 VAC Supply Power Terminal Block

Note: The supply power wire colors may be different on transformers from other manufacturers. Refer to the transformer manufacturer’s instructions and the project installation drawings for wiring details.

Setting the VEC address using the local display

To set the VEC address using the local display, complete the following steps:

To access the menu, press the ENT (Enter) button.
Navigate to the Controller menu with the up and down arrows, and press the ENT button.
In the Controller menu, navigate to Network and press the ENT button.
In the Network Parameters section, navigate to Address and press the ENT button. The display shows the default address value.
Press the ENT button. The address blinks.
Use the up or down arrow to increase or decrease the address to the value you want. Press the ENT button.
The address stops blinking and the display shows the old address.
Press either the up or down arrow. The screen refreshes to the new address.
Press ESC (Escape) repeatedly, until you return to the main screen. Ensure that the main screen shows that the system is operational.

Configuring sensors

To configure the installed sensors, complete the following steps:

Navigate to the Details menu.
Navigate to the Service menu and select the Inputs section.
Select the installed sensors using the drop-down menus for each parameter.

Updating the VEC

To update the VEC with the staged heat and staged cool application, complete the following steps:

Go to verasyscontrols.com, and log in with your credentials.
Navigate to Product Information & Support > Device Updates.
Download the package file for the application to the root folder of a USB 2.0 drive. The package file name is the following: VEC100-StgHTGStgCLG_xxxx.pkg
Note: Ensure that the USB drive is formatted as FAT or FAT32.
Insert the USB drive into the USB port on the VEC.
If the download does not start immediately, then in the controller’s local display, select the Update and Load Firmware option, then choose the package file on the USB drive, and press Enter.
When the application update finishes, use the Verasys Smart Building Hub (SBH) or the local display to configure the controller.

COBP wiring diagram

Figure 6: Changeover bypass wiring diagram – VEC100

Table 4: Changeover bypass wiring diagram

Number| Description| Object name (if

given)

---|---|---
1| Economizer Damper Output (optional)| MAD-O
2| Supply fan output (to fan VFD)| SF-O
3| Supply fan command (to fan VFD)| SF-C
4| Heating stage 1 command| HTG1-C
5| Heating stage 2 command| HTG2-C
6| Cooling stage 1 command| CLG1-C
7| Cooling stage 2 command| CLG2-C
8| Cooling stage 3 command| CLG3-C
9| Cooling stage 4 command| CLG4-C
10| 24 V HOT to damper motor| n/a
11| 24 V COM to damper motor| n/a
12| 24 V COM| n/a
13| 24 V HOT| n/a
14| From last device| n/a
15| To next device| n/a
16| Zone humidity sensor – monitor only (optional)| ZN-H

Table 4: Changeover bypass wiring diagram

Number| Description| Object name (if

given)

---|---|---
17| Return air CO2

Range: 0 ppm to 2,000 ppm, 0 VDC to 10 VDC

| RA-CO2
18| Return air temperature sensor| RA-T
19| Outside air temperature sensor

Note: This is a required sensor if the VEC100 controls the economizer. Position the sensor in a shaded area on the north side of the building.

| OA-T
20| Discharge air static pressure sensor

Range: 0 in. W.C. to 5 in. W.C., 0 VDC to 5 VDC

VAV wiring diagram

Figure 7: VAV wiring diagram – VEC100

Table 5: VAV wiring diagram

Number| Description| Object name (if

given)

---|---|---
1| Economizer Damper Output (optional)| MAD-O
2| Supply fan output (to fan VFD)| SF-O
3| Supply fan command (to fan VFD)| SF-C
4| Heating stage 1 command| HTG1-C
5| Heating stage 2 command| HTG2-C
6| Cooling stage 1 command| CLG1-C
7| Cooling stage 2 command| CLG2-C
8| Cooling stage 3 command| CLG3-C
9| Cooling stage 4 command| CLG4-C
10| 24 V HOT to damper motor| n/a
11| 24 V COM to damper motor| n/a
12| 24 V COM| n/a
13| 24 V HOT| n/a
14| From last device| n/a
15| To next device| n/a
16| Zone humidity sensor – monitor only (optional)| ZN-H

Table 5: VAV wiring diagram

Number| Description| Object name (if

given)

---|---|---
17| Return air CO2

Range: 0 ppm to 2,000 ppm, 0 VDC to 10 VDC

| RA-CO2
18| Return air temperature sensor| RA-T
19| Outside air temperature sensor

Note: This is a required sensor if the VEC100 controls the economizer. Position the sensor in a shaded area on the north side of the building.

| OA-T
20| Discharge air static pressure sensor

Range: 0 in. W.C. to 5 in. W.C., 0 VDC to 5 VDC

Commissioning the system

To activate the outputs and verify system operation, navigate to the Commissioning menu, change Start Commissioning to Trigger, and adjust outputs individually.
The following table describes the Details > Service > Factory menu options.
Table 6: Details: Service: Factory

Object or parameter| Description| Adjustable| Defaults| Enum set or range
---|---|---|---|---
Number of Cooling Stages

Installed

| Sets the number of cooling stages installed.| Adjustable| 2| 0 to 4
Number of Heating

Stages Installed

1 = Duct Static Pressure Sensor 2 = None

Equalize Cooling Stages Runtime| Enables the compressors to run in lead/lag mode based on runtime.| Adjustable| No| 0 = No 1 = Yes
OAT Cooling Lockout

Temperature

| Sets the temperature at which outside cooling lockout occurs.| Adjustable| 50°F (10°C)| 0°F to 100°F (-18°C to 38°C)
Economizer Minimum

Position Setpoint

bypass.

| Adjustable| False| 0 = False
1 = True
Supply Air Temperature Alarm Offset| If SAT is not in this value range, the SAT alarm delay starts. Examples: If the supply air setpoint is 55°F and this is set to 5°F, then the supply air must be under 60°F, or the delay timer starts. If the supply air setpoint is 110°F and this is set to 5°F then the supply

air must be above 105°F, or the delay timer starts.

| Adjustable| 5 delta °F (2.78 delta °C)| 0 delta °F to 25 delta °F (0 delta °C to 14 delta °C)
Supply Air Temperature

Alarm Delay

Product warranty
This product is covered by a limited warranty, details
of which can be found at www.johnsoncontrols.com/buildingswarranty.

Software terms

Use of the software that is in (or constitutes) this product, or access to the cloud, or hosted services applicable to this product, if any, is subject to applicable end-user license, open-source

software information, and other terms set forth at www.johnsoncontrols.com/techterms. Your use of this product constitutes an agreement to such terms.

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are subject to change without notice.
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