WCC III

WattMaster WCC III User Manual part 5

4. SCUSCR.EXE Screens

WCC III

4. SCUSCR.EXE Screens

T ABLE OF CONTENTS

SECTION 4: SCUSCR.EXE SCREENS

How to Start or Run the SCUSCR.exe

Program....................................................... 4-1

Controller Overview ....................................4-3

SCUSCR.EXE Screens Index.......................4-5

WCC VAV BOX III Sequence of Operation

(SS5010) ......................................................4-6

Modes of Operation ....................................4-8

Tenant Override Logs ...............................4-14

Series Fan Powered Pressure Dependent

Status & Setpoint Screens ....................... 4-58

Series Fan Powered Pressure Independent

Status & Setpoint Screens ....................... 4-60

Single Duct Changeover Pressure Dependent

Status & Setpoint Screens ....................... 4-62

Single Duct Changeover Pressure Independent

Status & Setpoint Screens ...................... 4-64

Single Duct Reheat Pressure Dependent

Status & Setpoint Screens ....................... 4-66

Single Duct Reheat Pressure Independent

Status & Setpoint Screens ....................... 4-68

Alarm Detection and Reporting ................4-15

WCC III VAV BOX III Trend Logging ..........4-15

Force Modes or Overrides ........................4-16

SCUSCR.EXE SCREENS ............................4-17

SAT 3D Addressing to TUC Control

Points ........................................................4-18

Single Duct Cooling-Only Screens............4-30

Single Duct Cooling-Only Screens –

Pressure Independent ..............................4-37

Parallel Fan Powered Pressure

Dependent Screens ..................................4-44

Parallel an Powered Pressure

Independent Screens ................................ 4-51

4. SCUSCR.EXE SCREENS

Running the SCUSCR Program

SECTION 4: SCUSCR.EXE SCREENS

__________________________________________

How to Start or Run the SCUSCR.exe Program (SS5026)

The SCUSCR.exe shortcut icon should have been installed on your WCC III front end computer desktop with the WCC III Installation Software CD. The WCC III Installation Software CD is WattMaster Controls Part # DM1WC01101X.

To start the SCUSCR.exe program, double-click the left mouse

button on the Shortcut Icon found on the Windows desktop. After a short period of time, dependent upon the CPU speed of your Windows based computer and the speed of your IP connection to

the internet, the WCC III T ype Connection Dialog Box will appear.

on the WCC III Front end computer. This IP Address connection is done on a higher address port number than normal (WCC III connection is port number 39289) to help reduce the risk of computer hacking.

Using your mouse, left-click on the <Access Job Site> button.

The Remote Access Dialog Window will appear.

By selecting <OK>, the SCUSCR.exe program will now start to

connect to the selected WCC III – MCD via this selected IP address

connection. It should bring up the WCC III SCUSCR Set Password Dialog screen within a new window. If the IP address connection

fails to connect to the WCC III – MCD, then another small dialog

box window will appear. This is the Cannot Communicate to Backtask Dialog Box.

Once you click <OK>, you will exit the SCUSCR.exe program.

You will have to ﬁ gure out why you cannot connect to the WCC III – MCD via the IP address connection.

Server IP Address:

This is the static IP address of the WCC III – MCD. An IP Address is like a phone number on the world wide web. The IP address for the WCC III – MCD must be Static (does not change) as opposed to Dynamic (constantly changing). This static IP address must be provided by your internet service provider. (A static IP address is the preferred IP connection method for the WCC III system to function.) If you actually know the static IP address of the WCC III – MCD that you wish to connect to, please enter it here in the

Server IP Address ﬁ eld, or better yet, continue to the Remote Access Dialog Window by selecting the <Access J ob Site> button.

You can use a Dynamic IP Address with the WCC III – MCD, but you must then have what is called a static “Host Name”. This static “Host name” must then be provided by your internet service provider and is limited to 58 total characters.

Port Number:

The SCUSCR.exe program opens a two-way, secure communications port that then allows for communication between the WCC III – MCD and the SCUSCR.exe program that is running

WCC III Technical Guide

In the Set Password Dialog Screen enter an “Operator:”

identiﬁ cation and a “Code:” or password equal to at least a pass

level 0 that has been previously set up on the WCCIII System Parameter – Operator Code Screen. (See the Operator Code

Screen of the System Parameter Screen in Section 3 for information

on setting up Operator Codes.) Click <Check Password>. If the “Current Pass Level:” stays at 0 or higher (1, 2, or 3), then click

<OK>. By selecting <OK>, the SCUSCR.exe program will now

start to connect to the selected WCC III – MCD via this selected

IP address connection. It should bring up the SCUSCR - Demo Screen within a new window. If the “Current Pass Level:” changes

to –1 then you do not have access to the WCCIII – MCD. If you

do not have access to the WCCIII – MCD and you click <OK>

then this connection to the SCUSCR.exe program is not an actual IP connection, but rather a “dummy” SCUSCR - demo screen window with no values.

4-1

4. SCUSCR.EXE SCREENS

Running the SCUSCR Program

The Remote Access Dialog Box will allow you to enter multiple

WCC III – MCD IP addresses based upon “Job Site” names. This is done by typing in the name of the jobsite you wish to call your system.

First you must select a “BLANK” line in the bottom box area with your left mouse button. (This line will then be highlighted in “Blue”.) You must then enter a Job Site name in the “Job Site” ﬁ eld, along with the static IP address and Port number (39289) for the WCC III – MCD that you wish to connect to with the SCUSCR. exe program.

If you are using a static “Host Name” instead of a static IP address, please make sure that the Dynamic Address check box has been selected, along with the static “Host Name” in the space provided. As mentioned previously, you must get this static “Host Name” from your internet service provider, and it is limited to 58 characters total.

Please note that this “Job Site” name will also be the name of a subdirectory that will automatically be created in the Local disk C:\ProgramFiles\WCCIII\SCUSCR subdirectory on the WCC III

Front end computer. The Remote Access Dialog Box also creates

a JobSite.dat data ﬁ le in the C:\ProgramFiles\WCCIII\SCUSCR subdirectory. This data ﬁ le is not a viewable type of ﬁ le. The JobSite.dat ﬁ le can be copied and then can be used on other WCC III front end computers. This reused JobSite.dat will then recreate the needed “Job Site” subdirectories on the other WCC III front end computers upon the reselection of the Job Site IP address.

In an already ﬁ lled out Remote Access Dialog Box, you can simply

select from the list of previously entered Job Sites that are displayed

in the bottom box ﬁ eld. Then left-click <OK>. This will take you back to the Connection Dialog Box that was ﬁ rst displayed. This Connection Dialog Box now should have the desired IP address in

the Server IP Address location ﬁ eld and the port number (39289) in the Port Number location ﬁ eld for the WCC III – MCD that you wish to connect to with the SCUSCR.exe program.

IP Address:

This is the static IP address where the WCC III – MCD is located. An IP Address is like a phone number on the world wide web. The IP address for the WCC III – MCD must be static (does not change) as opposed to Dynamic (constantly changing). This static IP Address must be provided by your internet service provider. (A static IP address is the preferred IP connection method for the WCC III system to function.)

Port Number:

The SCUSCR.exe program opens a two-way, secure communications port that then allows for communication between the WCC III – MCD and the SCUSCR.exe program that is running on the WCC III front end computer. This IP Address connection is done on a higher address port number than normal (WCC III connection is port number 39289) to help reduce the risk of computer hacking.

Job Site:

This is the name of the jobsite you wish to call your system. Please note that this name will also be the name of a subdirectory that will automatically be created in the Local disk C:\ProgramFiles\ WCCIII\SCUSCR subdirectory.

Host Name:

When you have ﬁ lled out all necessary ﬁ elds, left-click <OK>. This will take you back to the Connection Dialog Box that was ﬁ rst displayed. This Connection Dialog Box now should have the

desired IP address in the Server IP Address location ﬁ eld and the port number (39289) in the Port Number location ﬁ eld for the WCC III – MCD that you wish to connect to with the SCUSCR. exe program.

Left-click was ﬁ rst displayed. The Connection Dialog Box will have the

same IP address as listed originally before in the Server IP Address location ﬁ eld and the port number (39289) in the Port Number location ﬁ eld.

Left-click <Print> to send all of this data in this Remote Access Dialog Box to your Windows system default printer on the WCC

III front end computer. This print function is provided to give you a hard paper backup copy of these IP address for the various WCC III – MCD that you may have. This print function also creates a Printscreen.dat data ﬁ le in the C:\ProgramFiles\WCCIII\SCUSCR subdirectory. This data ﬁ le is not a viewable type of ﬁ le.

<Cancel> to return to the Connection Dialog Box that

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WCC III Technical Guide

4. SCUSCR.EXE SCREENS

Overview of Controllers

Controller Overview

WattMaster Controls, Inc. produces a line of application-speciﬁ c controllers that perform a multitude of various speciﬁ c dedicated functions. These dedicated controllers have a WCC user’s interface that is referred to as the SCUSCR.exe program. With this SCUSCR.exe program, you can view temperatures, setpoints, schedules, actuator position, global control commands, etc. and conversely with this same SCUSCR.exe program, you would be able to conﬁ gure and modify the setpoints, schedules, global control commands, etc. of any of these various speciﬁ c dedicated controllers. The three basic type controllers are listed below along with the two types of WCC III types of interfaces:

TUC2R (OE320) - Used mainly for VVT or VAVBOX type of applications

Two relays for direct control of the damper actuator with an actuator output connector with damper position input, a room temperature sensor input with override and adjust options, and an Expansion board connector for optional AUX fan and AUX Heating, Hot water/Chilled water valve connections.

You must consult the speciﬁ c application for the wiring, setup, and programming conﬁ guration for the exact software application you are using.

TUC5R (OE330) and TUC5R+ (OE331) - Used mainly for CV and Heat Pump applications

One Relay output for Fan ON/OFF control and 4 relay outputs that are usually conﬁ gurable for 1 to 2 stages of heating and/or cooling. Room temperature sensor input/ with override and adjust options, various sensor connections for measuring, supply air, return air, and outdoor air temperatures. Analog outputs for VFD control. The TUC5R has an optional further enhancement called TUC5R+. The TUC5R+ has an additional couple of analog inputs, and extra analog output, and an I2C expansion connection.

RTU-17 (OE310) - Used for Main unit VVT control, some complex CV, General Purpose Input Output ON/OFF controller, and dedicated AHU control applications

One Relay output for Fan ON/OFF control and 4 relay outputs that are usually conﬁ gurable for 1 to 2 stages of heating and/or cooling. Two relays are for direct control of the damper actuator with a damper position input, a Room Temperature sensor input with override and adjust options, various sensor connections for measuring, supply air, return air, and outdoor air temperatures. Analog output for VFD control.

You must consult the speciﬁ c application for the wiring, setup, and programming conﬁ guration for the exact software application you are using.

SAT 3C (OE455) - Used to interf ace the RTU-17 controller and some of the more complex TUC5R(+) controller software applications to the WCC III system

The SAT 3C occupies 8 SAT III addresses on the Satellite controller loop and is used as a data exchange device between the RTU-17 and/or TUC5R(+) data control points and the main WCC III data structures.

SAT 3D (OE455) - Used to interf ace the TUC2R controller and some of the more complex TUC5R(+) controller software applications to the WCC III system

The SAT 3D occupies 4 SAT III addresses on the Satellite controller loop and is used as a data exchange device between the TUC2R and/or TUC5R(+) data control points and the main WCC III data structures.

SAT 3F (OE456) - Used to interf ace the VAV/Zone Actuator package with the more complex V AV/Zone controller application software to the WCC III system

You must consult the speciﬁ c application for the wiring, setup, and programming conﬁ guration for the exact software application you are using.

WCC III Technical Guide

The SAT 3F occupies 4 SAT III addresses on the Satellite controller loop and is used as a data exchange device between the VAV/Zone controller actuator package data control points and the main WCC III data structures.

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4. SCUSCR.EXE SCREENS

Variable Air V olume, Heat Pump, & Constant V olume Overview

V AV Ov erview

Variable Air volume (VAV) is a technique for controlling the

capacity of a heating, ventilating, and/or air-conditioning (HVAC) system. The simplest VAV system incorporates one supply duct that, when in cooling mode, distributes approximately 55°F (13°C) supply air. Because the supply air temperature, in this simplest of VAV systems, is constant, the airﬂ ow rate must vary to meet the rising and falling heat gains or losses within the thermal zone served.

There are two primary advantages to VAV systems. The fan capacity control, especially with modern electronic variable speed drives, reduces the energy consumed by fans which can be a substantial part of the total cooling energy requirements of a building. Dehumidiﬁ cation demands are greater with a VAV system than with a constant volume system which modulates the discharge air temperature to attain part load cooling capacity.

The air blower’s airﬂ ow rate must be variable. For a single VAV air handler that serves multiple thermal zones, the airﬂ ow rate to each zone must be varied as well.

A VAV terminal unit controller, often called a VAV BOX, is

the zone-level airﬂ ow control device. It is basically a quality, calibrated air damper with an electronically controlled actuator. The VAV terminal unit is connected to a local SAT 3d controller which then connects to a central control system (WCC III - MCD). Historically, pneumatic control was commonplace, but electronic

direct digital contr ol systems are popular especially for mid-to-large

size applications. Hybrid control, for example, having pneumatic actuators with digital data collection, is popular as well.

Control of the system’s main fan capacity is critical in VAV systems. Without proper and rapid airﬂ ow rate control, the system’s ductwork, or its sealing, can easily be damaged by over pressurization. This system airﬂ ow control is usually done with a SAT III controller with the feedback from the zones in a global format.

While invented earlier, TempMaster (WattMaster) Corporation of Kansas City, Missouri is generally credited with perfecting early VAV technology. The VAV BOX hardware and software (Actuator, TUC Controller, Temperature sensor, differential pressure sensor, and proprietary software) is the heart of the technology.

Heat Pump Overview

The most common type of heat pump is an “air-source” system. “Split” air-source systems have an outdoor unit which includes a compressor, outdoor coil, fan, and reversing valve. The unit is connected with refrigerant-ﬁ lled tubing to an indoor component. The indoor unit contains a fan, indoor coil, and a supplemental resistance heating element. “Package” systems combine both components in a single unit that’s typically placed on the roof.

Depending on whether the heat pump is in a cooling or heating mode, the refrigerant moving through the system makes the indoor coils either hot or cold. A blower draws room air in through a ﬁ lter and pulls it across the indoor coil. An optional electric-resistance heating element can kick on when needed to supplement the heat. As the air passes by the coils, it either gathers or gives off heat depending on whether the coils are hot or cold. Warm or cool air travels through ductwork and registers into the building’s rooms.

Heat pumps give off less heat at one time than do conventional gas furnaces. This means that they offer a mellower type of heat, do not turn off and on with the same frequency as a gas furnace, and therefore circulate more air throughout the building. They are controlled by the same type of basic controls used for forced-air systems. On really cold days, a heat pump must work especially hard to collect heat. That’s when the supplemental heater switches on.

Constant V olume Overview

Constant Volume (CV) is a type of heating, ventilating, and airconditioning (HVAC) system. In a very basic simple CV system, the supply air ﬂ ow rate is constant, but the supply air temperature is varied to meet the thermal loads of the space.

Most CV systems are small and serve a single thermal zone. However, variations such as CV with reheat, CV multizone, and CV primary-secondary systems can serve multiple zones and larger buildings.

In mid to large size buildings, new central CV systems are not very common. Due to fan energy savings potential, variable air volume (VAV) systems are more common. However, in small buildings and residences, CAV systems are often the system of choice due to simplicity, low cost, and reliability. Such small CAV systems often have on/off control rather than supply air temperature modulation to vary their heating or cooling capacities.

There are two types of CV systems that are commonly in use to modify the supply air temperature—the terminal reheat system and the mixed air system.

The terminal reheat system cools the air in the air handling unit down to the lowest possible needed temperature within its zone of spaces. This supplies a comfortable quality to the space but wastes energy.

The mixed air system has two air streams, typically one for the coldest and one for the hottest needed air temperature in the zone. The two air streams are strategically combined to offset the space’s load. The mixed air system option is not as proﬁ cient at controlling the humidity, yet it does do well at controlling the temperature.

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WCC III Technical Guide

4. SCUSCR.EXE SCREENS

SCUSCR.EXE Screens Index

WCC V AV BOX III (WattMaster Software SS5010) Sequence of Operation 4-6

Figure 4-1: VAV BOX Status Screen 4-17 Figure 4-2: VAV BOX Setpoint Screen 4-22 Figure 4-3: TempMaster Corporation V AV BOX CFM Sizing Chart 4-24 Figure 4-4: VAV BOX Globals Screen 4-25 Figure 4-5: VAV BOX Mode of Operation Screen 4-27

WCC V AV BOX II (WattMaster Software SS5001) Sequence of Operation 4-28

Figure 4-6: Single Duct Cooling Only - Pressure Dependent Status Screen 4-30 Figure 4-7: Single Duct Cooling Only - Pressure Dependent Setpoint Screen 4-32 Figure 4-8: Single Duct Cooling Only - Pressure Dependent Globals Screen 4-34 Figure 4-9: Single Duct Cooling Only - Pressure Dependent Mode of Operation Screen 4-36 Figure 4-10: Single Duct Cooling Only - Pressure Independent Status Screen 4-37 Figure 4-11: Single Duct Cooling Only - Pressure Independent Setpoint Screen 4-39 Figure 4-12: Single Duct Cooling Only - Pressure Independent Globals Screen 4-41 Figure 4-13: Single Duct Cooling Only - Pressure Independent Setup Screen 4-43

Figure 4-14: Parallel Fan Powered - Pressure Dependent Status Screen 4-44 Figure 4-15: Parallel Fan Powered - Pressure Dependent Setpoint Screen 4-46 Figure 4-16: Parallel Fan Powered - Pressure Dependent Globals Screen 4-48 Figure 4-17: Parallel Fan Powered - Pressure Dependent Mode of Operation Screen 4-50 Figure 4-18: Parallel Fan Powered - Pressure Independent Status Screen 4-51 Figure 4-19: Parallel Fan Powered - Pressure Independent Setpoint Screen 4-53 Figure 4-20: Parallel Fan Powered - Pressure Independent Globals Screen 4-55 Figure 4-21: Parallel Fan Powered - Pressure Independent Mode of Operation Screen 4-57

Figure 4-22: Series Fan Powered - Pressure Dependent Status Screen 4-58 Figure 4-23: Series Fan Powered - Pressure Dependent Setpoint Screen 4-58 Figure 4-24: Series Fan Powered - Pressure Dependent Globals Screen 4-59 Figure 4-25: Series Fan Powered - Pressure Dependent Setup Screen 4-59 Figure 4-26: Series Fan Powered - Pressure Independent Status Screen 4-60 Figure 4-27: Series Fan Powered - Pressure Independent Setpoint Screen 4-60 Figure 4-28: Series Fan Powered - Pressure Independent Globals Screen 4-61 Figure 4-29: Series Fan Powered - Pressure Independent Setup Screen 4-61

Figure 4-30: Single Duct Changeover - Pressure Dependent Status Screen 4-62 Figure 4-31: Single Duct Changeover - Pressure Dependent Setpoint Screen 4-62 Figure 4-32: Single Duct Changeover - Pressure Dependent Globals Screen 4-63 Figure 4-33: Single Duct Changeover - Pressure Dependent Setup Screen 4-63 Figure 4-34: Single Duct Changeover - Pressure Independent Status Screen 4-64 Figure 4-35: Single Duct Changeover - Pressure Independent Setpoint Screen 4-64 Figure 4-36: Single Duct Changeover - Pressure Independent Globals Screen 4-65 Figure 4-37: Single Duct Changeover - Pressure Independent Setup Screen 4-65

Figure 4-38: Single Duct Reheat - Pressure Dependent Status Screen 4-66 Figure 4-39: Single Duct Reheat - Pressure Dependent Setpoint Screen 4-66 Figure 4-40: Single Duct Reheat - Pressure Dependent Globals Screen 4-67 Figure 4-41: Single Duct Reheat - Pressure Dependent Setup Screen 4-67 Figure 4-42: Single Duct Reheat - Pressure Independent Status Screen 4-68 Figure 4-43: Single Duct Reheat - Pressure Independent Setpoint Screen 4-68 Figure 4-44: Single Duct Reheat - Pressure Independent Globals Screen 4-69 Figure 4-45: Single Duct Reheat - Pressure Independent Setup Screen 4-69

WCC III Technical Guide

4-5

4. SCUSCR.EXE SCREENS

WCC III V A V BOX III Sequence of Operations

WCC V A V BOX III Sequence of Operation

(WattMaster Software Number SS5010)

Initialization

On initial power-up of the VAV BOX TUC-2R controller, the SCAN LED is extinguished for a few seconds and then the VAV BOX TUC-2R controller “ﬂ ashes” its address switch setting. If the address switch were set to 7, you would see 7 ﬂ ashes. After the address is ﬁ nished, the LED will extinguish for another 5 seconds. At the conclusion of this 5 second delay, the LED will begin a continuous ﬂ ashing while the Damper Feedback limits are calibrated. If the Damper is driving open, the LED will blink slowly. If the Damper is driving closed, the LED will blink fast. When the calibration is completed, the normal diagnostic ﬂ ashes will commence. These troubleshooting diagnostic LED ﬂ ashes are

listed below in Table 4-1.

No. of Blinks Description

1 Normal Operation

No Alarm Conditions Exist

2 Push Button Override or

Group Override is Active 4 Bad Airﬂ ow Sensor 5 Bad or Missing Space

Sensor 6 Damper Failure 7 Damper Feedback Failure

Table 4-1: LED Blink Codes

V AVBOX Conﬁ guration & Setup

General

There are several options that are available to conﬁ gure the WCC VAVBOX III controller for the appropriate equipment that it is installed on. All of these options can be set from the “four main screens” that are viewable from the SCUSCR.exe program. You can toggle through these four screens selections by pressing <Ctrl> + <►> (right arrow), which means next page or <Ctrl> + <◄> (left arrow), which means previous page.

VAV Box Control Method

Set this conﬁ guration item for the type of box the VAVBOX controller is used on. The options available are:

0 = Cooling Only Box (with Reheat if required)

1 = Heating/Cooling Changeover Box

2 = Series Fan Powered Box with Reheat

3 = Parallel Fan Powered Box with Reheat

Damper Operating Mode

Set the direction of rotation that the damper moves when driving towards its full open position. The following options available are:

0 = Direct Acting (Clockwise to Open Damper)

1 = Reverse Acting (Counterclockwise to Open Damper)

Pressure Independent Boxes - Airﬂ ow @ 1” W.C.

If this is a pressure independent box, this option allows you to calibrate the box CFM correctly using the VAV box manufacturer’s “K” factor. You must enter the correct “K” (CFM) factor for the inlet diameter of the box you are conﬁ guring.

NOTE: VAVBOX TUC-2R controllers will

automatically operate as pressure independent if the box size constant is greater than 0 CFM.

There are quite a few conﬁ guration selections available which can be then used to tailor the WCC III VAV BOX III software (WM Software # SS5010) operation to match the exact type of mechanical VAV box equipment that this VAV BOX TUC-2R controller is installed on. These setpoint and conﬁ guration items are programmed using a Windows-based personal computer that has the WCC III computer front-end software installed.

The SCUSCR.exe is the program that is used to view, modify, or program these selections. There are four main screens that are used for the viewing, programming, and setup of the WCC III VAV BOX III software that is installed on the TUC-2R controller.

4-6

Expansion Relays - Steps of Reheat

If the VAV box has reheat that is supplied by an electric coil, then this option must be set for the number of electric heating stages on the VAV box. If the VAV box has hot water heat with a 2 position hot water valve, set the number of stages to “1”. For hot water heat with a proportional hot water valve, set to “0”.

Options available are:

0 = No Staging

1 = 1 Stage of Reheat

2 = 2 Stages of Reheat

3 = 3 Stages of Reheat

WCC III Technical Guide

4. SCUSCR.EXE SCREENS

WCC III V A V BOX III Scheduling

Proportional Heating Signal

If the VAV box has hot water reheat using a proportional hot water valve, it is a 0-10 VDC Voltage Signal.

Allow V AV Box Heat with AHU Heat

If the VAV box that you are using has reheat, conﬁ guring this setting will allow the VAV box heat to operate at the same time as the HVAC unit heat.

This is the actual statement on the screen “Allow box heat to Remain On in the HVAC mode at the same time as the HVAC unit”

Options available are:

0 = No

1 = Yes

Main Fan Status

If the VAVBOX TUC-2R controller is installed on a non-fan powered box that has reheat, set this option to “1” in order to enable box reheat only when the HVAC unit fan is running. A full description of how this setting affects the various box types in the occupied and unoccupied modes is contained under the “Mode Sequence” heading that follows later in this manual. This is the actual statement on the screen “This Box Needs the Main Fan Status.”

Options available are:

0 = No - Heat can operate without fan

1 = Yes - Heat cannot operate without fan

Scheduling

Occupied/Unoccupied Mode

The VAVBOX TUC-2R controller monitors the SAT 3d - TUC communications loop for its Occupied and Unoccupied mode of operation command. The SAT 3d Controller receives this occupied or unoccupied command from the WCC III - MCD, and then the SAT 3d transmits the occupied command to the VAVBOX TUC-2R controller. This requires that the VAVBOX TUC-2R controllers all be connected to the SAT 3d controller via the TUC communication loop through their RS-485 connector and the VAVBOX TUC2R controllers to be properly addressed for the command to be received.

Push-button Override Operation

During unoccupied hours, you can force the VAVBOX TUC-2R controller back to occupied operation by pressing the override button on the Flushmount sensor for a period of time less than 3 seconds. This initiates the override or resets the override timer back to zero during unoccupied hours of operation. During Override operation, the user can cancel the override by pressing the override button for a period of time between 3 seconds and 10 seconds. This restores the normal unoccupied operation.

On larger installations with several terminal units, the VAVBOX Controllers can be conﬁ gured into groups with the Global Binaries so that an override generated by one VAVBOX Controller can cause several other controllers to follow along and return to occupied mode for the programmed duration. Other VAVBOX Controllers not in the same group will simply maintain an unoccupied damper or airﬂ ow setting as set by the user.

Push-button overrides (Logic Switch) are broadcast continuously by the initiating VAVBOX Controller until the controller itself times out or the override is cancelled by the user. These associated logic switches are meant to be used in Global Binary broadcasts which then can be used to force the air handler to start its main fan and provide cooling or heating, if so conﬁ gured.

WCC III Technical Guide

NOTE: VAVBOX TUC-2R controllers will go into an

override condition for the user-programmed amount of time when this button is pushed even if the unit is already in an occupied condition.

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4. SCUSCR.EXE SCREENS

WCC III V A V BOX III Operation Modes

Modes of Operation

There are 7 possible modes of operation for the HVAC Unit and the VAVBOX TUC-2R controller. These modes are determined by the supply air and/or space demand conditions. They are as follows:

Supply Air Neutral Mode - (based on HVAC Unit Supply

Air Temperature)

Space Vent Mode - (based on VAVBOX TUC-2R

Controller Space Temperature)

Supply Air Cooling Mode - (based on HVAC Unit Supply

Air Temperature)

Space Cooling Mode - (based on VAVBOX Controller

Space Temperature)

Supply Air Heating Mode - (based on HVAC Unit Supply

Air Temperature)

Space Heating Mode - (based on VAVBOX Controller

Space Temperature)

Off Mode (Not displayed. See deﬁ nition that follows.)

The process of determining each mode is discussed below, but the actual operation of each mode is explained in the section that follows.

deadband amount below the space temperature. To cancel the supply air cooling mode, the supply air temperature must rise to within 2°F of the space temperature.

Space Cooling Mode

This mode occurs when the Space Temperature rises above the user-programmed Space Cooling Setpoint.

Supply Air Heating Mode

This mode occurs when the Supply Air Temperature rises the deadband amount above the space temperature. To cancel the supply air heating mode, the supply air temperature must fall to within 2°F of the space temperature.

Space Heating Mode

This mode occurs when the Space Temperature falls below the user-programmed Space Heating Setpoint.

Off Mode (Not Displayed)

During unoccupied mode, the mode is considered “OFF” if the space temperature does not generate a heating mode or cooling mode based on the unoccupied heating & cooling setpoints.

Deﬁ nitions of Modes

VAVBOX Control Schemes

On all fan-powered and non-fan-powered terminal units, the supply air modes are calculated from supply air temperature, and space demands are calculated from setpoints. If the supply air temperature rises the deadband amount above the space temperature, the supply air mode is heating. To cancel the supply air heating mode, the supply air temperature must fall to within 2ºF of the space temperature. If the supply air falls the deadband amount below the space temperature, the supply air mode is cooling. To cancel the supply air cooling mode, the supply air temperature must rise to within 2 ºF of the space temperature. If the supply air is between the heating and cooling deadband amounts, it is considered to be in neutral mode.

Supply Air Neutral Mode

This mode occurs when the Supply Air Temperature is between the user-programmed heating and cooling deadband amounts.

Space Vent Mode

This mode occurs when the Space Temperature is between the user-programmed heating and cooling setpoints.

Supply Air Cooling Mode

This mode occurs when the Supply Air Temperature falls the

Damper Positions

The actual values for the minimum damper positions that are described in the following paragraphs can be user-conﬁ gured by changing the values in the setpoint screens of the VAVBOX TUC2R controller. These minimum values are expressed in damper open percentages for pressure dependent terminal units or in CFM for pressure independent terminal units.

Cooling Minimum

When the HVAC unit is in the Supply Air Cooling mode but the space does not require cooling, the VAVBOX damper will go to the Cooling Minimum position.

Heating Minimum

When the HVAC unit is in the Supply Air Heating mode but the space does not require Heating, the VAVBOX damper will go to the Heating Minimum position.

Vent Minimum

This is the position the VAVBOX damper will move to when the HVAC unit is in the Supply Air Vent mode.

Nite/Reheat Minimum

This setpoint has two different functions depending on whether the HVAC unit is in Occupied or Unoccupied mode.

4-8

WCC III Technical Guide

4. SCUSCR.EXE SCREENS

WCC III V A V BOX III Operation Modes

Occupied Mode

If the VAVBOX TUC-2R controller is used on a non-fan-powered terminal unit that has reheat, the VAVBOX damper will move to the Nite/Reheat position whenever a Space Heating demand occurs and the HVAC unit is in Supply Air Cooling or Neutral mode. When the HVAC unit is in Supply Air Heating mode, the VAVBOX damper will modulate as required to maintain the Space Heating setpoint.

Unoccupied Mode

When using non-fan powered terminal units, the VAVBOX damper will position itself in the Nite/Reheat minimum position. In order for fan powered terminal units to position the damper to the Nite/ Reheat minimum position, the check for main fan status must be selected and the HVAC unit fan must be operating.

Occupied Mode Sequences

Space Vent Mode

This mode only applies to the Occupied Mode of operation. If the equipment is in the Unoccupied Mode, then a lack of heating or

cooling demand would generate the Off Mode.

If the HVAC unit is in Supply Air Neutral Mode, you can adjust the damper position on pressure dependent terminal units and the airﬂ ow on pressure independent terminal units to provide a ﬁ xed amount of ventilation air into the space when there are no heating or cooling demands. During this time, the damper does not modulate on pressure dependent terminal units. On pressure independent terminal units, it only modulates to the extent required to maintain the vent minimum airﬂ ow setting. If the VAVBOX

Controller detects that the HVAC unit is in Supply Air Heating mode, indicating that the air handler has activated its heat, the heating airﬂ ow minimum will be substituted for the vent minimum position. If the VAVBOX Controller detects that the HVAC unit is in Supply Air Cooling mode, indicating that the air handler has activated its cooling, the cooling airﬂ ow minimum will be substituted for the vent minimum position.

When the VAVBOX TUC-2R controller is in the Supply Air Cooling mode, the damper is normally held at the minimum cooling position until the space temperature begins to rise above the cooling setpoint. As the space temperature rises to within 0.5 ºF of the Occupied Cooling Setpoint, the damper/airﬂ ow calculation causes the air valve to open proportionally until the maximum setpoint is achieved at 1.5 ºF above the setpoint. This is a 2 ºF proportional window starting 0.5 ºF below the cooling setpoint to

1.5 ºF above the cooling setpoint.

The damper/airﬂ ow is never allowed to modulate outside the user adjusted minimum setpoint and the maximum setpoint. The maximum damper/airﬂ ow setpoint applies to heating and cooling modes of operation only. All of the modes have their own individual minimum setting.

Series Flow Fan T erminals

If the VAVBOX TUC-2R controller has been conﬁ gured as a Series Fan Powered terminal unit, the series fan relay will activate and run the series box fan continuously anytime the VAVBOX TUC2R controller is in occupied mode.

In all cases, before the series box fan can be activated, the air damper is driven fully closed and held that way for 30 seconds to make sure the series box fan hasn’t inadvertently started to spin backwards. Once the series box fan starts, it waits an additional 10 seconds to allow the fan to spin up before it starts to open the damper and introduce airﬂ ow from the HVAC unit fan.

Parallel Flow Fan T erminals

During normal cooling or vent mode and adequate air supply, the parallel fan will be off. During the occupied cooling or vent mode, the Parallel fan will only activate if the damper/ airﬂ ow is below a user deﬁ ned low limit setting. This causes it to be used as a make-up air source. When the damper/airﬂ ow rises 15% above the low limit setpoint, the Parallel fan will be deactivated.

The check for main fan status setting has no effect on the Parallel Fan box when in the occupied mode.

Space Cooling Mode

Occupied Space Cooling mode is initiated by the temperature in the space rising above the Occupied Cooling Setpoint.

If the VAVBOX TUC-2R controller is in the Supply Air Heating mode and another VAVBOX TUC-2R controller has a cooling demand, the damper/airﬂ ow for the VAVBOX TUC-2R controller requiring cooling will position itself to provide the heating minimum setpoint amount of air into the space. No modulation open will occur because the space does not want the warm air currently being supplied by the air handler.

WCC III Technical Guide

Space Heating Mode

Occupied Space Heating mode is initiated by the temperature in the space falling below the Occupied Heating Setpoint.

If the VAVBOX TUC-2R controller is in the Supply Air Cooling mode and another VAVBOX TUC-2R controller has a heating demand, the damper/airﬂ ow for the VAVBOX TUC-2R controller requiring heating will position itself to provide the Cooling Minimum amount of air into the space. No modulation open will occur because the space does not want the cold air currently being supplied by the air handler.

4-9

4. SCUSCR.EXE SCREENS

WCC III V A V BOX III Operation Modes

When the VAVBOX TUC-2R controller is in the Occupied Supply Air Heating mode, the damper will be held at the Heating Minimum position until the space temperature falls to within 0.5 ºF of the Occupied Heating Setpoint.

As the space temperature falls below the heating setpoint, the damper/airﬂ ow calculation causes the air valve to open proportionally until the maximum setpoint is achieved at 1.5 ºF below the setpoint. This is a 2 ºF proportional window starting 0.5 ºF above the heating setpoint to 1.5 ºF below the heating setpoint.

Two different conﬁ gurations are available for the Occupied Space Heating mode. If the box is conﬁ gured to allow reheat during HVAC Heat mode, the reheat relays can be activated even when the VAVBOX TUC-2R controller is in the Supply Air Heating mode. If the box is conﬁ gured not to allow reheat when the HVAC unit is in Heat mode, the box heat relays will be de-energized when the VAVBOX TUC-2R controller is in Supply Air Heating mode. In either conﬁ guration, when the VAVBOX TUC-2R controller is in the Supply Air Heating mode, the damper will modulate open proportionally to the space demand. The proportional window for the space temperature is 0.5 ºF above to 1.5 ºF below the heating setpoint. This allows the space to take advantage of the warm supply air in the duct.

The VAVBOX TUC-2R controller can activate auxiliary heating relays if the Expansion module has been connected and the correct number of heating stages (1, 2, or 3) has been conﬁ gured. During demands for heat, the ﬁ rst stage will activate whenever the space temperature drops below the heating setpoint. The second stage will activate if the space temperature falls 1.0 ºF below the heating setpoint. The third stage will activate if the space temperature falls

2.0 ºF below the heating setpoint. There is a two-minute delay between staging. This prevents stages from activating at the same time. Once a heating stage has been activated, it must remain on for at least one minute. Once it has been deactivated, it must remain off for at least two minutes. The third stage relay will deactivate when the space temperature rises to within 1.0 ºF of the heating setpoint. The second stage will deactivate when the space temperature rises to the heating setpoint. The ﬁ rst stage relay will deactivate when the space temperature rises above the heating setpoint by 1.0 ºF.

Box Fan Relay & Reheat Relay Staging Occupied Mode

Relays

Stage On

+0.5 F

Above

Box Heat

Setpoint

At Box

Heat

Setpoint

-1.0 F

Below

Box Heat

Setpoint

-2.0 F

Below

Box Heat

Setpoint

+1.0 F

Above

Box Heat

Setpoint

+1.0 F

Above

Box Heat

Setpoint

At Box

Heat

Setpoint

-1.0 F

Below

Box Heat

Setpoint

Note 1: The series fan will run continuously anytime the

VAVBOX TUC-2R controller is in occupied mode. Note 2: The parallel fan will run whenever Space Heating Mode is

active. At all other times, the fan will only activate if the damper/airﬂ ow is below a user deﬁ ned low limit setting.

Series

Fan

See

Note 1

See

Note 1

Parallel

Fan

See

Note 2

See

Note 2

Heat

Stage

Heat

Stage

Heat

Stage

Modulating (Proportional) Heat

The VAVBOX TUC-2R controller expansion board also provides an analog output for control of a modulating hot water valve or SCR electric heater. It provides a 0-10 VDC signal to control the heating device. When the space temperature drops to 0.5 ºF above the Heating Setpoint the output starts at 0 VDC and ramps up to 10 VDC at 1.5 ºF below the Heating Setpoint.

See Table 4-2: Relay Staging - Occupied Mode for a complete

layout of the various fan and heat relay staging points.

4-10

Table 4-2: Relay Staging Occupied Mode

WCC III Technical Guide

4. SCUSCR.EXE SCREENS

WCC III V A V BOX III Operation Modes

Series Flow Fan T erminals

If the VAV/Zone Controller has been conﬁ gured as a Series Fan Powered terminal unit, the series fan relay will activate and run the series box fan continuously anytime the VAVBOX TUC-2R controller is in occupied mode.

Parallel Flow Fan T erminals

On parallel fan powered terminal units, the fan will run whenever Space Heating mode is active. At all other times, the fan will only activate if the damper/airﬂ ow is below a user-deﬁ ned low limit setting. This causes it to be used as a make-up air source. When the damper/airﬂ ow rises 15% above the low limit setpoint, the fan will be deactivated if there are no heating stages active and no space demand exists.

The check for main fan status setting has no effect on the Parallel Fan box when in the occupied mode.

Unoccupied Mode Sequences

NOTE: For the Unoccupied Mode Sequences to work

correctly the VAV/Zone controller must be able to read the Main Fan Status.

Space Vent Mode

This mode only applies to the Occupied Mode of operation. If the equipment is in the Unoccupied Mode, then a lack of heating or cooling demand would generate the Off Mode (not displayed).

Off Mode (Not Displayed)

During unoccupied mode, the mode is considered ‘OFF’ if the space temperature does not generate a heating mode or cooling mode based on the unoccupied heating & cooling setpoints.

When using non-fan powered terminal units, the VAVBOX TUC2R controller damper will position itself in the Night/Reheat minimum position. In order for fan powered terminal units to position the damper to the Nite/Reheat minimum position, the check for main fan status must be selected and the HVAC unit fan must be operating. If check main fan status has not been selected the damper will be in the fully closed position.

Space Cooling Mode

During Unoccupied Mode, the HVAC unit is normally off. Unoccupied Space Cooling mode is initiated by the temperature in the space rising to the Unoccupied Cooling Setpoint.

If the VAVBOX TUC-2R controller is in the Unoccupied Supply Air Heating mode because one or more of the VAVBOX controllers has a heating demand, and another VAVBOX controller has a cooling demand, the damper/airﬂ ow for the VAVBOX controller requiring cooling will position itself to provide the heating minimum setpoint amount of air into the space. No modulation open will occur because the space does not want the warm air currently being supplied by the air handler.

When the VAVBOX TUC-2R controller is in the Unoccupied Supply Air Cooling mode, the damper will be held at the Night/ Reheat minimum position until the space temperature begins to rise above the cooling setpoint. As the space temperature rises to within 0.5 ºF of the Unoccupied Cooling Setpoint, the damper/ airﬂ ow calculation causes the air valve to open proportionally until the maximum setpoint is achieved at 1.5 ºF above the setpoint. This is a 2 ºF proportional window starting 0.5 ºF below the cooling setpoint to 1.5 ºF above the cooling setpoint.

The damper/airﬂ ow is never allowed to modulate outside the user adjusted minimum setpoint and maximum setpoint. The maximum damper/airﬂ ow setpoint applies to heating and cooling modes of operation only. All of the modes have their own individual minimum setting.

Series Flow Fan T erminals

If the VAVBOX TUC-2R controller has been conﬁ gured as a Series Fan Powered terminal unit and check for main status has been selected, the series fan relay will activate and run the series box fan continuously anytime the HVAC unit fan is running. The series fan relay will activate and run the series box fan when the space temperature rises to 0.5 ºF below the unoccupied cooling setpoint anytime the HVAC unit fan is not running. The damper will be held closed if the HVAC unit fan is not running and will be held at the Nite/Reheat minimum until the space temperature rises to 0.5 ºF below the unoccupied cooling setpoint if the HVAC unit fan is running. If check for main fan status has not been selected, the series fan relay will activate and run the series box fan when the space temperature rises to 0.5 ºF below the unoccupied cooling setpoint. The damper will be in the fully closed position until the space temperature rises to 0.5 ºF below the unoccupied cooling setpoint.

WCC III Technical Guide

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4. SCUSCR.EXE SCREENS

WCC III V A V BOX III Operation Modes

NOTE: If check for main fan status is selected, the series fan

will activate any time the HVAC unit fan is operating.

Parallel Flow Fan T erminals

In the Unoccupied Cooling mode the parallel fan will be off whether check for main fan status has been selected or not. If check for mainfan status has been selected, the damper will be held at the Nite/Reheat minimum until the space temperature begins to rise to 0.5 ºF below the unoccupied cooling setpoint. If check for main fan status has not been selected, the damper will be held in the fully closed position until the space temperature begins to rise to 0.5 ºF below the unoccupied the cooling setpoint.

Space Heating Mode

During unoccupied mode, the HVAC unit is normally off. Unoccupied Space Heating mode is initiated by the temperature in the space falling below the Unoccupied Space Heating Setpoint.

If the VAVBOX TUC-2R controller is in the Unoccupied Supply Air Cooling mode because one or more of the VAVBOX TUC-2R controllers has a cooling demand and another VAVBOX controller has a heating demand, the damper/airﬂ ow for the VAVBOX controller requiring heating will position itself to provide the Night/ Reheat setpoint amount of air into the space. No modulation open will occur because the space does not want the cold air currently being supplied by the air handler.

When the VAVBOX TUC-2R controller is in the Unoccupied Supply Air Heating mode, the damper will be held at the Night/ Reheat minimum position until the space temperature begins to fall below the Unoccupied heating setpoint. As the space temperature falls to 0.5 ºF above the unoccupied Heating Setpoint, the damper/ airﬂ ow calculation causes the air valve to open proportionally until the maximum setpoint is achieved at 1.5 ºF below the setpoint. This is a 2 ºF proportional window starting 0.5 ºF above the heating setpoint to 1.5 ºF below the heating setpoint.

Heat mode, the box heat relays will be de-energized when the VAVBOX TUC-2R controller is in Supply Air Heating mode. In either conﬁ guration, when the VAVBOX TUC-2R controller is in the Supply Air Heating mode, the damper will modulate open proportionally to the space demand. The proportional window for the space temperature is 0.5 ºF above to 1.5 ºF below the heating setpoint. This allows the space to take advantage of the warm supply air in the duct.

If check for main fan status is not selected and the VAVBOX terminal unit has auxiliary heat (baseboard heat etc.) that does not require the HVAC unit fan to operate, reheat can be used without the HVAC unit fan operating. If check for main fan status is selected, the reheat will only operate when the HVAC unit fan is operating.

The VAVBOX TUC-2R controller can activate auxiliary heating relays if the relay Expansion Board has been connected and the correct number of heating stages (1,2, or 3) has been conﬁ gured. During demands for heat, the ﬁ rst stage will activate whenever the space temperature drops below the heating setpoint. The second stage will activate if the space temperature falls 1.0 ºF below the heating setpoint. The third stage will activate if the space temperature falls 2.0 ºF below the heating setpoint. There is a twominute delay between staging. This prevents stages from activating at the same time. Once a heating stage has been activated, it must remain on for at least one minute. Once it has been deactivated, it must remain off for at least two minutes. The third stage relay will deactivate when the space temperature rises to within 1.0 ºF of the heating setpoint. The second stage relay will deactivate when the space temperature rises to the heating setpoint. The ﬁ rst stage relay will deactivate when the space temperature rises above the heating setpoint by 1.0 ºF.

See Table 4-3: Relay Staging - Unoccupied Mode for a complete

layout of the various fan & heat relay staging points.

Modulating (Proportional) Heat

As with the Occupied Mode of operation, two different conﬁ gurations are available for the Unoccupied Space Heating mode. If the box is conﬁ gured to allow reheat during HVAC Heat mode, the reheat relays can be activated even when the VAVBOX TUC-2R controller is in the Supply Air Heating mode. If the box is conﬁ gured not to allow reheat when the HVAC unit is in

4-12

WCC III Technical Guide

4. SCUSCR.EXE SCREENS

WCC III V A V BOX III Operation Modes

Box Fan Relay & Reheat Relay Staging Unoccupied Mode

Relays

Stage On

+0.5 F

Above

Box Heat

Setpoint

At Box

Heat

Setpoint

-1.0 F

Below

Box Heat

Setpoint

-2.0 F

Below

Box Heat

Setpoint

+1.0 F

Above

Box Heat

Setpoint

+1.0 F

Above

Box Heat

Setpoint

At Box

Heat

Setpoint

-1.0 F

Below

Box Heat

Setpoint

Note 1: If check for main fan status is selected, the series fan will

activate any time the HVAC unit fan is operating. Note 2: If the VAVBOX TUC-2R has been conﬁ gured as a Parallel Fan

Powered terminal unit, the Parallel fan will run continuously when the VAVBOX TUC-2R Controller is in the Space Heating mode no matter whether check for main fan status has been selected or not.

Table 4-3: Relay Staging - Unoccupied Mode

Series Flow Fan T erminals

Series

Fan

See

Note 1

See

Note 1

Parallel

Fan

See

Note 2

See

Note 2

Heat

Stage 1

Heat

Stage 2

Heat

Stage 3

HVAC unit fan is running. If check for main fan status has not been selected, the series fan relay will activate and run the series box fan when the space temperature falls to within 0.5 ºF above the unoccupied heating setpoint and the damper will stay in the fully closed position.

NOTE: If check for main fan status is selected, the series fan

will activate any time the HVAC unit fan is operating.

Parallel Flow Fan T erminals

If the VAVBOX TUC-2R controller has been conﬁ gured as a Parallel Fan Powered terminal unit, the Parallel fan will run continuously when the VAVBOX TUC-2R controller is in the Space Heating mode no matter whether check for main fan status has been selected or not. If check for main fan status is selected, the damper will remain in the closed position until the HVAC unit controller is broadcasting that the HVAC unit fan is operating, regardless of whether it is calling for heat or not. Once the broadcast is received, the damper will then move to its Night/Reheat minimum position until the space temperature begins to fall below 0.5 ºF above the unoccupied heating setpoint. If check for main fan status has not been selected, the damper will be held in the fully closed position until the space temperature begins to fall below 0.5 ºF above the unoccupied heating setpoint. When in Supply Air Heating mode, the damper will modulate to maintain the Unoccupied Heating setpoint.

NOTE: For the VAVBOX TUC-2R controller to go

into Supply Air Heating mode the HVAC unit fan must be operating and the Supply Air temperature must be the deadband amount above the Space temperature.

WCC III Technical Guide

4-13

4. SCUSCR.EXE SCREENS

WCC III V A V BOX III T enant Override Logs

Damper Control

The damper position is calculated by the mode and demand from the space sensor. Included in this calculation is an Integral function. This prevents the damper/airﬂ ow from stagnating at a position somewhere above the setpoint because the supply air temperature or duct pressure isn’t quite enough to satisfy the space at the currently calculated proportional position. The Integral causes the calculation to keep adding a small amount of the proportional error back into the damper/airﬂ ow position each time a new position is calculated. The amount the Integral adds back in is user adjustable. This value is presented as a number between 0.0 and 100.0. That means that if the integral is less than 10.0, you are adding a percentage from 0 to 100% of the error back into the calculation. If you increase the Integral above 10, you are adding more than 100% back in.

With just proportional control, a 1 ºF error would cause a 50% increase in damper/airﬂ ow if the Integral is not included. (1 °F is half of the 2 ºF Proportional Window.)

If you had set the Integral to 10, the calculation would add 2% to the current damper/airﬂ ow calculation each time. The calculation occurs once every 10 seconds, so it would take a little over 4 minutes to reach the programmed 100% maximum.

Example:

This sliding window allows the control to be much tighter on the smaller terminal units than can be achieved on the larger terminal units as far as CFM readings. On a large terminal unit, 25 CFM may not be noticeable, but on a small terminal unit, 25 CFM may be more than the minimum airﬂ ow setting for the space.

If the pressure sensor is disconnected or fails on a pressure independent terminal unit, the damper position goes to 100% open and the VAV/Zone controller generates a General TUC Alarm to

alert the user that a failure has occurred.

On either type of terminal unit, a space sensor failure will force the damper to position itself to the 45% position and it will not change until the sensor is repaired or replaced.

T enant Ov erride Logs

If you require tenant billing for push-button override usage, the MCD has the ability to track the amount of override time generated by each space sensor equipped with push-button override.

NOTE: The VAVBOX TUC-2R controller will go into an

override condition for the user programmed amount of time when this button is pushed even if the unit is already in a occupied condition.

1. 50% Remaining / 2% Integral = 25 Moves to get to a 100% Maximum.

2. 25 Moves times 10 seconds = 250 seconds or a little over 4 minutes to reach the 100% maximum damper/airﬂ ow position.

Of course, different space temperature errors and different Integral values cause this calculation to operate slower or faster. It is up to the user to determine the optimum setting that provides the tightest temperature control without causing the damper to continue to hunt or modulate, causing premature wear of the actuator gears and motor.

On pressure dependent terminal units, the damper position is maintained to within ± 3% of the calculated position. No attempt is made to position the damper exactly on the calculated position. This reduces wear and tear on the actuator gears and motors, and the amount of airﬂ ow involved is not affected by that small amount of damper error.

On pressure independent terminal units, the airﬂ ow is maintained to within roughly 3% of the terminal unit size constant but no tighter than 16 CFM on the smallest terminal units. The actual control window is based on the formula:

Window = Terminal unit size X Square Root (1 / 750), where Terminal unit size refers to the total rated CFM of the terminal unit.

Storing and retrieving these logs requires a dedicated front end computer running the WCC III Trendlog front-end software program. No other method exists for retrieving these logs. That means that all of your VAV/Zone controllers will be connected together on the communications loop and the loop will be terminated at a Satellite device which is connected to another communications loop that is terminated at an on-site MCD computer. The tenant logs are kept on the dedicated job site computer’s hard drive. The only limitation to the number of logs stored is the capacity of the hard drive on the computer to which it is being logged.

NOTE: There is also a Tenant Override software that can

be programmed that tenants can use to turn on multiple zones(among other things) at once without having to use the push button override on the space sensor. See Section 6 of the WCC III manual for detailed operation of this program.

WARNING: This WCC III - MCD computer must be on 24

hours a day, 7 days a week, running the Backtask.exe software in order for tenant logging to be tracked. The tenant logs are kept on the dedicated end user job site computer’s hard drive. The only limitation to the number of logs stored is the capacity of the hard drive on the computer they are being logged to.

4-14

WCC III Technical Guide

4. SCUSCR.EXE SCREENS

WCC III V A V BOX III T rend Logging

Alarm Detection and Reporting

The VAVBOX TUC-2R controller continuously performs self diagnostics during normal operations to determine if any operating failures have occurred. These failures can be reported to the user in several ways, depending on the type of system and options installed by the user. If WCC III computer front-end software is installed, the alarms will be reported on the Alarm summary screen of the WCC3.exe program and will be logged to disk of the WCC III

- MCD. These system logs can be downloaded and viewed with the WCC3Utilies.exe program. If the WCC III - MCD is set up to Email out alarms, then the alarm can initiate an Email callout to alert someone to the alarm condition. See the WCC III computer front end WCC3.exe program operations manual for further information on this topic.

Internal Trend Logging

The Satellite controller can maintain an Internal Trend Log which records a ﬁ xed set of values at an interval programmed by the user. In order to utilize these logs, a computer with WCC III front-end software installed must be able to communicate with the WCC III system.

The available options for Satellite internal trend logging are: Change of State, Run Time Total, Analog Trend, and Analog Peaks. The Change of State trend log can log the on time and date, and off time and date for up to 8 binary points per Satellite. The Run Time Total trend log can log the total accumulated on or off time in seconds, minutes, or hours of up to 8 binary points within the satellite controller. The total amount of on time that can be accumulated without being reset is 9999 seconds, minutes, or hours. The Analog Trend log can log the current analog value for up to 8 analog points within the satellite. The timed interval for the Analog Trend logging can be from 1 to 99 minutes, or from 1 to 99 hours. The Analog Peaks trend log will record the time, date, and value of the Last Low Peak and the time, date, and value of the Last High Peak for up to 8 analog points.

On the Change of State and Analog Trend there are 48 log positions available. Once the last (48th) position has been recorded, depending on how the user programs the log, it can Roll(saving the latest and deleting the oldest), or stop until the log is reset. This means the user is required to retrieve the logs at an interval that is shorter than the duration of the last 48 logs.

The items that can be logged in the log are listed below:

• Date (Automatic)

• Time (Automatic)

• Space Temperature (Analog Input “AX” with X =

1 to 8)

• Date and Time of latest High and Low Space

Temperature Peaks

• Cooling/Heating Demand (Data Register A

(“RXA” with X = 1 to 8)) Note: This point will read out as a whole number with no decimal, examples: a 3.4 cooling demand will read out 34, a

2.5 heating demand will read out -25

• Supply Air Temperature (User programmable

Global Analog “GAXXX” with X = 1 to 256)

• Push Button Override Status (Logic Switch/Input

“LX” with X = 1 to 8)

• Airﬂ ow on Pressure Independent Terminal Units

(Data Register B (“RXB” with X = 1 to 8))

• Damper Position (Analog Output “PX” with x = 1

to 8)

For more information on Internal Trend Logging, see chapter 3 of the WCCIII manual.

CAUTION: These logs are subject to loss if a long power

outage occurs because there is no battery backed memory on the VAVBOX controller. These values are stored on the Satellite controller and its memory may only last up to 3 days.

External Trend Logging

Any addressable point on the WCC III system is capable of being trend logged with the WCC3Trendlog.exe program. See section 8 for further details.

Shown below are some log intervals and the duration of 48 logs.

1 Minute Interval .......................... 48 Minute Duration

15 Minute Interval ........................ 12 Hour Duration

30 Minute Interval ........................ 24 Hour Duration

60 Minute Interval ........................ 48 Hour Duration

8 Hour Interval ...............................16 Day Duration

WCC III Technical Guide

4-15

4. SCUSCR.EXE SCREENS

WCC III V A V BOX III F orce Modes

Force Modes or Overrides

The VAVBOX TUC-2R controller damper can be forced to one of several positions. These force modes aid the user during troubleshooting or air balancing, etc.

• Force Damper Full Open (Ignores Airﬂ ow

Reading)

• Force Damper Full Closed (Ignores Airﬂ ow

Reading )

• Force to Maximum Airﬂ ow/Damper Setpoint

• Force to Minimum Airﬂ ow/Damper Setpoint (for

the current Supply Air Mode)

• Force to Fixed Airﬂ ow/Damper Setpoint

• Force Damper to Re-Calibrate

The Force to Fixed Airﬂ ow/Damper mode also has a setpoint associated with it. This allows the user to provide a non-changing ﬁ xed amount of air into the space that doesn’t affect the Minimum or Maximum setpoints. That means the user doesn’t have to disturb the real minimum and maximum setpoints to achieve a nonstandard setting during their troubleshooting or air balancing modes.

The Force to Minimum mode uses the currently active minimum setting based on the Supply Air Neutral, Cooling, or Heating modes. Whatever mode the VAVBOX TUC-2R controller is in sets the minimum used by the force mode.

The damper force modes will remain in effect until cancelled by the user or until the power is removed. There are no force commands available for the auxiliary relays.

Fan Parallel Fan

Heat

4-16

WCC III Technical Guide

SCUSCR.EXE SCREENS

VAV BOX CONTROLLER

Satellite: _ 4 Unit: 1 Location: Version: 3.04

TYPE OF CONTROL METHOD: XXXXX XXXXX XXXXX

[ STATUS SCREEN ] [ EXPANSION OUTPUTS ]

{ Optional } Operating Mode: OCCUPIED MODE

Space Temp Mode: VENT MODE Fan Status.......: OFF

Supply Air Mode: COOLING MODE

Heat Relay.......: OFF

Space Temperature...............: 76.2°F

Active Cooling Setpoint.........: 72.0°F Heat Relay.......: OFF

Active Heating Setpoint.........: 70.0°F

Current Heat/Cool Demand........: 4.2°F Proportional Heat: 0%

Sensor Slide Adjust...{Optional}: 0.0°F

EMS Effect on Setpoints.........: 0 %

Supply Air Temperature..........: 55.0°F

Discharge Temperature...........: 55.0°F

Airflow.........{Pr.Indep. ONLY}: 0 CFM Main Fan Status..: OFF

Calculated Damper/Airflow.......: 54%

Damper Position.................: 56%

< Ctrl-RIGHT ARROW > for Setpoints Screen File: SCR220.SDF

The SCUSCR.exe program is used to access stand-alone controllers that have been preprogrammed with application-speciﬁ c software such as VAVBOX software, AHU control software, Heat Pump control software, etc. These screens are displayed the same as the older WCC II screens.

NOTE: Only the VAV BOX III software is explained in this

section.

V AV BO X III for WCC III Softw are Screens

4. SCUSCR.EXE SCREENS

V AV BO X III Status Screen

Figure 4-1: VA V BOX Status Screen

This is the main summary screen for the WCC3 VAV BOX III software for the WCC III system and there should be sufﬁ cient information on this screen that by simply viewing of this screen an operator can detect if the VAV BOX III controller is operating correctly or not.

Satellite: Unit:

The satellite ﬁ eld is used to input a valid SAT 3d address number. The unit number is used to select a valid TUC (Terminal Unit Controller) that is connected to the SAT 3d controller.

WCC III Technical Guide

Valid SAT 3d addresses are in groups of 4, starting at address 4. You cannot start a SAT 3d address with a 5, 6, 7, 9, 10, 11, 13, 14, 15 etc. It must be a derivative of address 4, example 4, 8, 12, 16, 20, 24, 28,etc. If there is a question with Satellite addressing, please check the Satellite summary screen to see if a valid SAT 3d exists before continuing.

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4. SCUSCR.EXE SCREENS

V AV BO X III Status Screen

Each Sat3d uses up the address space of the equivalent of 4 regular

SAT III controllers. See Table 4-4: “SAT3d Addressing to TUC

control points” for a further explanation.

Certain TUC control points have been shoehorned into SAT 3d control points so that they may be used in global calculations.

Table 4-4: SAT3d Addressing to TUC control points

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WCC III Technical Guide

4. SCUSCR.EXE SCREENS

VAV BOX CONTROLLER

Satellite: _ 4 Unit: 1 Location: Version: 3.04

TYPE OF CONTROL METHOD: XXXXX XXXXX XXXXX

[ STATUS SCREEN ] [ EXPANSION OUTPUTS ]

{ Optional } Operating Mode: OCCUPIED MODE

Space Temp Mode: VENT MODE Fan Status.......: OFF

Supply Air Mode: COOLING MODE

Heat Relay.......: OFF

Space Temperature...............: 76.2°F

Active Cooling Setpoint.........: 72.0°F Heat Relay.......: OFF

Active Heating Setpoint.........: 70.0°F

Current Heat/Cool Demand........: 4.2°F Proportional Heat: 0%

Sensor Slide Adjust...{Optional}: 0.0°F

EMS Effect on Setpoints.........: 0 %

Supply Air Temperature..........: 55.0°F

Discharge Temperature...........: 55.0°F

Airflow.........{Pr.Indep. ONLY}: 0 CFM Main Fan Status..: OFF

Calculated Damper/Airflow.......: 54%

Damper Position.................: 56%

< Ctrl-RIGHT ARROW > for Setpoints Screen File: SCR220.SDF

V AV BO X III Status Screen

Figure 4-1, cont.: VA V BOX Status Screen

Location

The Location ﬁ eld is a user programmable ﬁ eld name that is used to identify the location of the WCC3 VAV BOX zone or space that the WCC3 VAV BOX III is controlling. (There is space in this ﬁ eld

Space Temp Mode:

There are four types of Space temperature control modes: Space Cooling Mode, Space Heating Mode, Space Vent Mode, and Space Off Mode

for 20 alphanumeric characters.)

Space Cooling Mode

Type of Control Method:

The “Type of Control Method:” message ﬁ eld at the top of this

This mode occurs when the Space Temperature rises above the Space Cooling Setpoint.

screen comes from the VAV BOX mode of operation, which is Screen #4 of the (Ctrl – Right Arrow – Three times) of the VAV

Space Heating Mode

BOX setup screens. See Figure 4-5 for further details. There

are four possible messages displayed in this ﬁ eld “Single Duct Cooling”, “Heating/Cooling Change Over”, ”Series Fan Powered”,

This mode occurs when the Space Temperature falls below the Space Heating Setpoint.

or Parallel Fan Powered.

Space Vent Mode

There are there three main combinatorial control modes of the WCC3 VAV BOX III - Operating Mode, Space Temp mode, and Supply Air mode. Control of the WCC3 VAV BOX III is dependent upon a mixture of all three of these modes. See the sequence of operation of the WCC3 VAV BOX III for further details.

Operating Mode:

There are three main operating modes that can be listed here. They are Occupied, Unoccupied, and Override Occupied

WCC III Technical Guide

This mode occurs when the Space Temperature is between the Cooling Setpoint and the Heating Setpoint.

Space Off Mode

During unoccupied mode, the mode is considered “OFF” if the space temperature does not generate a heating mode or cooling mode based on the unoccupied heating & cooling setpoints.

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4. SCUSCR.EXE SCREENS

V AV BO X III Status Screen

Supply Air Mode:

There are three types of Supply Air Modes: Supply Air Cooling Mode, Supply Air Heating Mode, and Supply Air Neutral Mode.

Supply Air Neutral Mode

This mode occurs when the Supply Air Temperature is between the heating and cooling deadband amounts.

Supply Air Cooling Mode

This mode occurs when the Supply Air Temperature falls the deadband amount below the space temperature. To cancel the supply air cooling mode, the supply air temperature must rise to within 2 ºF of the space temperature.

Supply Air Heating Mode

Space Temperature

This is the current temperature of the zoned area that the WCC3 VAVBOX III is controlling. It is listed in degrees Fahrenheit. (Zone temperatures sensors WM Part# OE210, OE211, OE212, or OE213) A duct sensor in the return air ducting may also be used for return air control of the VAVBOX zone (WM Part# OE230 or OE231).

Active Cooling Setpoint

This is the current cooling setpoint that the VAV BOX III software is controlling to. This setpoint is dependent on “Occupied” or “Unoccupied” conditions. It is listed in degrees Fahrenheit.

Active Heating Setpoint

This is the current heating setpoint that the VAV BOX III software is controlling to. This setpoint is dependent on “Occupied” or “Unoccupied” conditions. It is listed in degrees Fahrenheit.

Current Heat / Cool Demand

This is the current heating or cooling demand for the VAV Box controller in degrees from the current setpoint. This current setpoint could be the occupied cooling or heating setpoint or the unoccupied cooling or heating setpoint. It is listed in degrees Fahrenheit.

Sensor Slide Adjust ….(Optional)

If the zone temperature sensor that is connected to the VAV BOX controller is equipped with a Slide offset pot, (WM Part # OE212, or OE213) for tenant comfort control of space temperature, then this ﬁ eld value will range from “0” to “5”, with 0 being disabled, and 1, 2, 3, 4, and 5, being the degrees in Fahrenheit, both plus and minus from the programmed heating or cooling setpoint depending on the current mode of operation of the WCC3 VAV BOX III controller.

EMS Effect on Setpoints

On a command from the WCC III – MCD central processor, typically during peak load demand periods, the Terminal Unit Controller (TUC-2R) will increase the cooling setpoint and also decrease the heating setpoint by an amount programmed by the system operator. The amount of increase/decrease that can be programmed is 0-10 ºF.

Supply Air Temperature

This is used to determine if the main VAV system is in a heating or cooling mode. VAV BOX zones so equipped with reheat can use cool air and then “Reheat” it back up to temperature for desired heating of the zone. These “reheated” zones are usually located on the outer perimeter of a building’s heating or cooling needs. This is because interior zones generally require cooling-only type of control.

Discharge Air Temperature

If the VAV BOX is so equipped with a stage or multiple stages of reheat, it can then affect the temperature output of the VAV BOX. An input on the VAV BOX controller must then be used to measure this outgoing temperature from the VAV BOX.

Airﬂ ow ….. {Pr. Indep. ONLY}

This is the current airﬂ ow calculation in CFM (Cubic Feet per Minute).

Calculated Damper/Airﬂ ow

In pressure independent systems, you may want to have a set CFM level in the zoned space.

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WCC III Technical Guide

+ 50 hidden pages

WattMaster WCC III User Manual part 5

Specifications and Main Features

Frequently Asked Questions

User Manual