Honeywell W7751D, W7751H, W7751B, W7751F SYSTEM ENGINEERING

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Introduction

............................................................................................................................... 4

Description of Devices........................................................................................... 4

Control Application................................................................................................. 4

Control Provided.................................................................................................... 7

Products Covered.................................................................................................. 9

Organization of Manual.......................................................................................... 9

Applicable Literature.............................................................................................. 10

Product Names...................................................................................................... 10

Agency Listings...................................................................................................... 11

Abbreviations and Definitions ................................................................................ 12

Zone Control Definitions ........................................................................................ 13

Variable Air Volume ATUs ................................................................................ 13

Air Terminal Unit Control................................................................................... 13

Pressure - Dependent And Pressure - Independent Control ............................ 13

Variable Air Volume ATUs (VAV)...................................................................... 13

Single Duct Variable Air Volume (VAV) Systems.............................................. 14

Pressure Dependent Throttling VAV Boxes...................................................... 14

Pressure Independent VAV Boxes.................................................................... 14

Series Fan Powered VAV Boxes....................................................................... 14

Parallel Fan Powered VAV boxes..................................................................... 14

Induction VAV Boxes ........................................................................................ 14

Single-Duct Constant Volume Zone Reheat Air Terminal Units........................ 15

Dual Duct Air Handling Systems....................................................................... 15

Variable Constant Volume (Zero Energy Band) Dual-Duct VAV Boxes............ 15

Dual Duct Constant Volume Systems............................................................... 15

Dual-duct mixing box terminal units.............................................................. 15

Dual-duct constant volume mixing box terminal units.................................. 15

Variable Volume/Variable Temperature (VVT).................................................. 15

Single Zone Rooftop Air Handling Unit Control (CVAHU)................................. 16

Temperature and Ventilation Control ........................................................... 16

Unitary Equipment Control................................................................................ 16

Construction........................................................................................................... 16

Controllers......................................................................................................... 16

Performance Specifications.......................................................................... 19

Communications:.......................................................................................... 19

Environmental .............................................................................................. 20

Inputs/Outputs.............................................................................................. 21

Digital Inputs................................................................................................. 21

Digital Outputs: ............................................................................................. 21

Wall Modules .................................................................................................... 21

Sensor (Duct Mount)......................................................................................... 21

Configurations........................................................................................................ 21

General ............................................................................................................. 21

Type of Box Fan................................................................................................ 21

Dual Duct Flow Mixing: (For setup and Calibration refer to the

Dual Duct Calibration procedure in Appendix B.).................................... 21

Dual Duct No Flow Mixing: (For setup and Calibration refer to the

Dual Duct Calibration procedure in Appendix B.).................................... 21

Dual Duct Flow Mix: (Pressure independent cooling, pressure

dependent heating using one Excel 10.)................................................. 21

Dual Duct Flow Mix: (Alternate Configuration).............................................. 21

74- 2949- 1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Dual Duct Constant Volume: (For setup and Calibration refer to the Dual Duct Press Flow Mix: (Pressure dependent cooling and

Dual Duct Press Flow Mix: (Alternate Configuration).................................. 21

Dual Duct Discharge Sensor Constant Volume (pressure Dual Duct Press Flow Mix (pressure dependent cooling and Dual Duct Pressure Independent (pressure independent heating

PWM fan. ..................................................................................................... 21

T7780 DDWM Binding for VAVII Controllers................................................ 21

Type of Reheat Coil .......................................................................................... 21

Pneumatic Valve Actuator Control ............................................................... 21

Exhaust Tracking Option................................................................................... 21

Occupancy Sensor............................................................................................ 21

Window Open/Closed Digital Input ................................................................... 21

Heat/Cool change over ..................................................................................... 21

Wall Module Options......................................................................................... 21

Common Temperature Control (Share Wall Module)................................... 21

Sensor Options ................................................................................................. 21

Application Steps

Pneumatic Retrofit Applications........................................................................ 21

............................................................................................................................... 21

Overview................................................................................................................ 21

Step 1. Plan The System....................................................................................... 21

Step 2. Determine Other Bus Devices Required ................................................... 21

Step 3. Lay Out Communications and Power Wiring............................................. 21

E-Bus Layout..................................................................................................... 21

Power Wiring..................................................................................................... 21

Power Budget Calculation Example............................................................. 21

Line Loss...................................................................................................... 21

Step 4. Prepare Wiring Diagrams.......................................................................... 21

General Considerations.................................................................................... 21

W7751B OEM Version...................................................................................... 21

W7751D,F Field-Mount Versions...................................................................... 21

W7751H Version............................................................................................... 21

E-Bus Termination Module................................................................................ 21

Step 5. Order Equipment....................................................................................... 21

Step 6. Configure Controllers ................................................................................ 21

General............................................................................................................. 21

Hardware I/O Assignment................................................................................. 21

Fan Type...................................................................................................... 21

Reheat Definitions........................................................................................ 21

Reheat Type................................................................................................. 21

Flow Type..................................................................................................... 21

Miscellaneous............................................................................................... 21

Personality Information..................................................................................... 21

Commissioning ................................................................................................. 21

Job Commissioning...................................................................................... 21

ID Number......................................................................................................... 21

Bench Top Configuring................................................................................. 21

Configuring in the Field ................................................................................ 21

Configuring the Zone Manager..................................................................... 21

Excel 10 VAV Controller Point Mapping............................................................ 21

Step 7. Troubleshooting......................................................................................... 21

Troubleshooting Excel 10 Controllers and Wall Modules ................................. 21

Temperature Sensor and Setpoint Potentiometer Resistance Ranges ............ 21

Alarms............................................................................................................... 21

Broadcasting the Service Message................................................................... 21

W7751 Controller Status LEDs......................................................................... 21

T7770C or D Wall Module Override LED.......................................................... 21

T7770C,D or T7780 DDWM Bypass Pushbutton Operation............................. 21

T7780 DDWM Bypass Pushbutton ................................................................... 21

Dual Duct Calibration procedure in Appendix B.).................................... 21

heating using one Excel 10.)................................................................... 21

independent discharge using one Excel 10)........................................... 21

heating using one Excel 10).................................................................... 21

and cooling using one Excel 10)............................................................. 21

74-2949–1 2

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Appendices

...............................................................................................................................21

Appendix A. Creating a Work Bench for Configuring Excel 10 W7751D,F

VAV Controllers................................................................................................. 21

Appendix B. Using E-Vision to Commission a W7751 Controller.......................... 21

Job Commissioning ............................................................................................... 21

ID Number.............................................................................................................. 21

Bench Top Configuring ..................................................................................... 21

Configuring in the Field..................................................................................... 21

Configuring the Zone Manager ......................................................................... 21

Sensor Calibration............................................................................................. 21

Air Flow Balancing (For Pressure Independent applications only)................... 21

Procedure.......................................................................................................... 21

Resetting Air Flow Calibration to Factory Defaults............................................ 21

VAVII Calibration Sequence.............................................................................. 21

Appendix C. Sequences of Operation................................................................... 21

Common Operations......................................................................................... 21

Room Temperature Sensor (RmTemp)........................................................ 21

Remote Setpoint (RmtStptPot or DischargeAir_Sensor).............................. 21

Setpoint Limits (StptLoLim and StptHiLim)................................................... 21

Bypass Mode (StatusOvrride and StatusLed).............................................. 21

BypassTime.................................................................................................. 21

OverrideType................................................................................................ 21

OverridePriority............................................................................................. 21

Standby Mode.............................................................................................. 21

Window Sensor............................................................................................ 21

CAV Control ................................................................................................. 21

Continuous Unoccupied Mode..................................................................... 21

Share Wall Module....................................................................................... 21

Night Purge .................................................................................................. 21

Morning Warm-Up........................................................................................ 21

Smoke Control.............................................................................................. 21

Demand Limit Control................................................................................... 21

Start-Up........................................................................................................ 21

Air Flow Control Sequences of Operation.................................................... 21

Dual Duct, Pressure Independent, with flow mixing, with cold and

hot duct flow pickups (uses a satellite Excel 10 for hot duct)........................ 21

Dual Duct Flow Mixing: (For setup and Calibration refer to the

Dual Duct Calibration procedure in Appendix B)..................................... 21

Dual Duct, Pressure Independent, without flow mixing, with cold and

hot duct flow pickups (uses a satellite Excel 10 for hot duct)........................ 21

Dual Duct No Flow Mixing: (For setup and Calibration refer to the

Dual Duct Calibration procedure in Appendix B)..................................... 21

Dual Duct, Pressure Independent cooling, Pressure Dependent heating

with flow mixing, with cold duct flow pickup................................................... 21

Dual Duct Press Flow Mix (pressure dependent cooling and heating

using one Excel 10)................................................................................. 21

Dual Duct, Pressure Independent cooling and heating, constant volume

with hot and cold duct flow pickups............................................................... 21

Dual Duct Constant Volume:........................................................................ 21

Dual Duct, Pressure Dependent cooling and heating, with Flow mixing

and no flow pickups....................................................................................... 21

Dual Duct Press Flow Mix (pressure dependent cooling and heating

using one Excel 10)................................................................................. 21

Dual Duct, Pressure Independent cooling and Pressure Dependent

heating, with Constant Volume and Discharge Air Flow pickup.................... 21

Dual Duct Discharge Sensor Constant Volume (pressure dependent

cooling and heating using one Excel 10). ............................................... 21

Appendix D. Complete List of Excel 10 VAVII Controller User Addresses............ 21

Appendix E. Q7750A Excel 10 Zone Manager Point Estimating Guide................. 21

Approximate Memory Size Estimating Procedure............................................. 21

Appendix F. Custom Flow Pickup Tables (not Applicable for

Pressure Dependent Applications).................................................................... 21

Method 1. Pressure Velocity Formula............................................................... 21

Method 2. Pressure Versus Flow Graph........................................................... 21

3 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

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The W7751B,D,F,H Excel 10 VAV II Box Controllers provide enhanced control solutions for single duct, dual duct and constant volume air terminal units. They feature preprogrammed heating/cooling or reheat control algorithms for standard VAV Box control applications that are selected through the E-Vision software configuration tool. They use Echelon® LonWorks® communication technology and the new Free Topology Transceiver (FTT) for greater installation flexibility. In addition, they are the first VAV Box Controllers in the marketplace from any manufacturer that use the LonMark® VAV Controller compliance profile for true openness and interoperability with third party LonMark® devices. They can be used in stand-alone applications or be used in combination with Excel 10 Zone Manager (FTT), other Excel Controllers, and the Excel Building Supervisor, to provided a complete and low cost control solution for small to large commercial buildings.

The W7751B,D,F,H Excel 10 VAV Box Controllers are configurable direct digital controllers designed for pressure independent or pressure dependent single duct VAV, dual duct VAV and constant volume air terminal unit control solutions. Four models are available including a low cost circuit board version (W7751B) for internal panel mounting, two plenum mounted controllers complete with a wiring subbase for easy field installation (W7751D and F) and the low cost W7751H Smart VAV Actuator consisting of the Excel 10 Controller that is factory mounted and wired to a 90 second ML6161B Actuator. All four of the Excel 10 VAV Box Controllers contain an integral microbridge air flow sensor that provides flow measurement for pressure independent applications. The controller configuration is selected using a personal computer and the E-Vision and CARE software configuration tools. The Excel 10 VAV Box Controllers offer many features required in todays commercial buildings including energy saving setpoint reset for electrical demand limit control, standby setpoints for setpoint reset in the occupied mode and unoccupied setpoints for both heating and cooling. The control solutions are scaleable from stand-alone installations, to a networked system using a Zone Manager as the network master or they can be fully integrated into the complete Excel 5000 system with Excel 80, 100, 500 and 600 controllers and Excel Building Supervisor. In addition, they

provide true open communication with the use of the LonMark® Controller compliance profile and the FTT for greater flexibility in network wiring and integration with third party LonMark® devices.

The T7770 are direct-wired wall modules used in conjunction with W7751B,D,F,H Controllers. The zone controlled by the W7751 Controllers will typically use a T7770 Wall Module with a temperature sensor for space temperature measurement in a minimum system configuration. Additional features available in the T7770 model include analog setpoint input, override digital input pushbutton, override status LED and E-Bus network access jack.

The T7780 Digital Display Wall Module (DDWM) has all of the features of the T7770 Wall Modules but communicates via the E-Bus.

The C7770A Air Temperature Sensor is a direct wired temperature sensor that is used to sense discharge or return air in a duct controlled by a W7751 Controller.

The Q7750A Excel 10 Zone Manager is a communications interface that allows devices on the E-Bus network to communicate with devices on the EXCEL 5000® System C-Bus. Fig. 1 shows an overview of a typical system layout. The Q7750A also provides some control and monitoring functions.

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VAV systems in commercial buildings typically incorporate a central air handler that delivers a modulated volume of air at a preconditioned temperature to multiple zones. Each zone is serviced by a VAV terminal box unit. Each box incorporates an air flow pickup assembly and motorized damper with optional fan and/or reheat coil. The controller determines and regulates the air flow of conditioned air to the space. The zone being fed by the terminal box will use a T7770 Wall Module or a T7780 DDWM for space temperature determination and access to the E-Bus network for operators. Fig. 2 shows a typical VAV box control application for the W7751B,D,F Controllers. Fig. 3 shows a typical VAV box control application for the W7751H Smart VAV Actuator. Table 1 shows the capabilities of the Excel 10 VAV Box Controllers.

74-2949–1 4

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

PERSONAL COMPUTER TOOLS E-VISION CARE

FTT E-BUS COMMUNICATIONS NETWORK

EXCEL 10

Q7751A FTT E-BUS ROUTER

W7750B CVAHU CONTROLLER

EXCEL 10 T7770 WALL MODULE

Q7752A FTT E-BUS SERIAL ADAPTER

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

1234567 89101112131415J3

C-BUS COMMUNICATION NETWORK

EXCEL 10 Q7750A FTT ZONE MANAGER

C-BUS TO E-BUS INTERFACE DEVICE

FTT E-BUS COMMUNICATIONS NETWORK

EXCEL 10 W7752 FTT FAN COIL UNIT CONTROLLER

EXCEL BUILDING SUPERVISOR

FTT E-BUS COMMUNICATIONS NETWORK

EXCEL 10 W7751F PANEL PLENUM MOUNT VERSION VARIABLE AIR VOLUME CONTROLLER

EXCEL 500

Q7740A 2-WAY REPEATER

EXCEL 10 T7780 DIGITAL DISPLAY WALL MODULE

PRIMARY AIR

∆P PICKUP

TERMINAL HEAT

AIR TERMINAL UNIT

Fig. 1. Typical system overview.

ECHELON BUS

DISCHARGE AIR

TEMPERATURE SENSOR WITH REMOTE SETPOINT ADJUSTMENT AND UNOCCUPIED BYPASS OVERRIDE BUTTON

WINDOW CONTACT

OCCUPANCY CONTACT

RETURN AIR

E-BUS NETWORK ACCESS

M11817

EXCEL 10 VAV CONTROL MODULE W7751

E-BUS NETWORK ACCESS

Fig. 2. Typical W7751B,D,F VAV box control application.

M1 = DAMPER ACTUATOR M2 = VALVE ACTUATOR

M11818

5 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

PRIMARY AIR

TERMINAL HEAT

AIR TERMINAL UNIT

DISCHARGE AIR

TEMPERATURE SENSOR WITH REMOTE SETPOINT ADJUSTMENT

RETURN AIR

∆P PICKUP

EXCEL 10 W7751G SMART VAV ACTUATOR

M1-REHEAT VALVE ACTUATOR

E-BUS

E-BUS NETWORK ACCESS

M11819

Fig. 3. Typical W7751H Smart VAV Actuator box control application (Smart VAV Actuator mounts directly on the damper shaft as represented by the dotted line). (The W7751H does not include a window contact or occupancy

sensor contact terminals, which are available via the network only.)

Table 1. Excel 10 VAV Box Controller Capability.

Excel 10 VAV Box Controller

Capability W7751B,D,F W7751H

Fan

None X X Series X X Parallel - Temp X X Parallel - Flow X X Parallel - PWM

Reheat

None X X One Stage Reheat X X** Two Stages Reheat X X** Three Stages Reheat X — One Stage Periph X X** Floating Reheat (Two outputs) X X** Floating Periph (Two outputs) X X** Floating Reheat then Periph

X—

(Four outputs) Floating Periph then Reheat

X—

(Four outputs)

Excel 10 VAV Box

Controller Capability W7751B,D,F W7751H

Exhaust Tracking

Disabled X X Enabled X X

Occupancy Sensor

None X X Connected X —*

Window Contact

None X X Connected X —*

Wall Module Configuration

Local X X Shared X X

Wall Module Type

Sensor Only X X Sensor and Setpoint X X Sensor, Setpoint and Bypass X X Sensor and Bypass X X

PWM Reheat (One output) X X** PWM Periph (One output) X X** PWM Reheat then Periph

XX**

(Two outputs) PWM Periph then Reheat

XX**

(Two outputs)

(continued)

74-2949–1 6

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Table 1. Excel 10 VAV Box Controller Capability

Excel 10 VAV Box

Controller Capability W7751B,D,F W7751H

Air Temperature Sensor

20 K ohm air temperature sensors can be used in conjunction with wall modules (Either a wall module or an air temperature sensor can be used with the W7751H, but not both.)

Dual Duct Pressure

Independent Flow mixing

Cold and hot duct flow

pickups

Without flow mixing

Cold and hot duct flow

pickups

Constant volume

Cold and hot duct flow

pickups With cold duct pickup only X X Constant volume with

discharge pickup only

Dual Duct Pressure

Dependent

With flow mixing X X Without flow mixing X X

* Available only via the network for the W7751H.

** The W7751H Smart VAV Actuator provides damper

control and two configurable outputs available for two stages of reheat, floating reheat (requires two outputs), PWM Reheat or Periph (one output required), PWM Reheat and Periph (two outputs required) or one stage of reheat or Periph (can be PWM also) and a serial or parallel fan.

*** These applications require two W7751 Excel 10

controllers per zone.

**** Flow sensor in discharge air. The temperature

control loop controls the cool damper position and the flow controls adjust the heating damper position.

(Continued).

X*** X***

X**** X****

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The W7751B,D,F,H Controllers are primarily intended for pressure independent, single or dual-duct VAV box control. Pressure independent control specifies that the individual zone terminal unit has a means for maintaining a consistent volume of air into the zone regardless of the input static pressure. The controller modulates the air flow into the zone to satisfy the Zone Temperature Setpoint. Minimum Air Flows are maintained except during emergency strategy periods or during building Unoccupied periods if using physical position stops, a MIN/MAX air flow is always maintained (see Table 2).

Pressure dependent control specifies that the damper position is controlled by space temperature only and not by a measurement of air flow volume. The amount of air delivered to the zone at any given damper position is dependent on the static pressure in the supply air duct (physical position stops, range stop pins, are used to keep the damper at a fixed position).

VAV systems generally only provide cool air to the zones; therefore, the W7751 Controller provides additional outputs for control of heating systems such as reheat coils for Heat mode or Morning warm-up mode operation. The heating equipment can be staged-resistive heating, staged 2-position (solenoid) valve, or modulated steam or hot water valve.

The possible modes of operation are listed in Table 2.

7 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Table 2. Modes Of Operation For Excel 10 VAV Controller.

Mode Description Events Causing a Controller to Switch to This Mode

Effective Occupancy (User Address: StatusOcc)

OCCUPIED* Controller is in Occupied mode. Any of the following: Network input (DestSchedOcc) containing

STANDBY* Controller is in Standby mode. Network input (DestSchedOcc) containing time-of-day schedule

UNOCCUPIED Controller is in Unoccupied mode. Network input (DestSchedOcc) containing time-of-day schedule

Override Modes (User Address: StatusOvrride)

OCCUPIED* Controller is in Occupied mode. Network input (DestSchedOcc) containing time-of-day schedule

UNOCCUPIED Controller is in Unoccupied mode. Network input (DestSchedOcc) containing time-of-day schedule

BYPASS User-initiated Bypass of the

NOT ASSIGNED No Bypass action. No Override input received.

Operational Modes (User Address: StatusMode)

START-UP AND WAIT (followed by) FLOAT_OUT_SYNC

COOLING The Excel 10 VAV Controller is

HEATING The Excel 10 VAV Controller is

REHEAT The Excel 10 VAV Controller is

MORNING WARM-UP

NIGHT PURGE The main AHU is supplying fresh

PRESSURIZE The box damper is set at

DEPRESSURIZE The box damper is set at

FLOW TRACKING Temperature control is turned off.

*Available only via the network for the W7751H.

Unoccupied mode.

Flow Diversity on power-up provides a staggered start sequence to evenly apply the load to the supply fan and electrical system.

controlling the Cooling mode.

controlling the Heating mode.

controlling the Reheating mode.

The main AHU is supplying warm air, and the box damper is set at (WarmupDmprPos).

(100 percent outdoor) air, and the box damper is set at (PurgeDmprPos).

(PressDmprPos).

(DepressDmprPos).

The box maintains a Flow Setpoint based on the sum of all of the controllers supplying the zone (the SrcBoxFlow controller provides other controllers with DestFlowTrack input).

time-of-day schedule flag from either the Excel 10 Zone Manager, a C-Bus controller, an Occupancy Sensor Digital Input, or from Network input (DestManMode) for manual override to OCCUPIED mode.

flag from the Excel 10 Zone Manager must be OCCUPIED and the Occupancy Sensor Digital Input must be UNOCCUPIED.

flag from the Excel 10 Zone Manager, the C-Bus, or the network input CmdManOcc has a value of UNOCCUPIED.

flag from the Excel 10 Zone Manager, the C-Bus, the Occupancy Sensor Digital Input or from the Network input (DestManMode) for manual override to OCCUPIED mode.

flag from the Excel 10 Zone Manager, the C-Bus, or the network input DestManualOcc has a value of UNOCCUPIED.

Digital input (Bypass pushbutton) has been pressed, and the Bypass duration timer has not yet expired, or the network input DestManualOcc has a value of BypassTime.

These modes occur on controller power-up, and after downloading to the controller from E-Vision or going to auto mode to manual mode (DestManMode). Temperature and flow control loops are disabled.

Network input (DestHvacMode) containing AHU operational mode information from other E-Bus controllers that have the value of COOL/AUTO.

Network input (DestHvacMode) containing AHU operational mode information from other E-Bus controllers that have the value of HEAT/AUTO.

Network input (DestHvacMode) has the value of AUTO, so that when cool air is supplied to the box and the space temperature is below the Heating Setpoint, causes the Excel 10 VAV Controller control algorithm to energize the Reheat coil(s).

Network input (DestHvacMode) containing AHU operational mode information from E-Bus controllers that have the value of MORNING WARM-UP.

Network input (DestHvacMode) containing AHU operational mode information from E-Bus controllers that have the value of NIGHT PURGE.

Network input (DestHvacMode) containing smoke control signal from E-Bus controllers that have the value of PRESSURIZE.

Network input (DestHvacMode) containing smoke control signal from E-Bus controllers that have the value of DEPRESSURIZE.

Configuration parameter is box type (Flow_Tracking). NOTE: See Fig. 45. FlowTrackOfst (Flow Offset) determines the differential between the boxes that are the supply air flow and the exhaust air flow.

(continued

)

74-2949–1 8

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Table 2. Modes Of Operation For Excel 10 VAV Controller (Continued).

Mode Description Events Causing a Controller to Switch to This Mode

MANUAL POSITION Box damper is set to (ManDamp). Typically this is done through E-Vision or XBS by setting the

Operational Modes (User Address: StatusMode)

MANUAL FLOW Air Flow Setpoint is set to

MANUAL See comments for FlowManState in

CLOSED* Indicates a window is open; box

SELF TEST Control algorithm is disabled; various

I/O TEST Control algorithm is disabled, various

FLOAT_OUT_SYNC Controller is synchronizing actuators. Control loops are temporarily suspended. NOTE: For controllers

(DestManFlowSpt).

Appendix D,

damper is set to (WinOpnDmprPos).

hardware tests can be performed.

hardware tests can be performed (see I/O Test Mode, Application Step

7. Troubleshooting).

Table D7. LonMark®.

point DamperPos to Manual mode.

Typically this is done through E-Vision or XBS by setting the point SupplyFlow to Manual mode.



The (Window) Digital Input contacts are open and the controller is configured for a window sensor.

The variable (TestMode) was set to TESTING. NOTE: This mode is available in Excel 10 VAV Controller versions and also include the W7751H Smart VAV Actuator.

The I/O test pin/pad is shorted (see the I/O Test Mode, Application Step 7. Troubleshooting). NOTE: The I/O Test Mode is not available on the W7751H Smart VAV Actuator.

that enter the Unoccupied mode, its actuators are controlled and resynchronize during a time frame of 125 percent of the actuators motor speed; for example, if an actuators motor speed is 90 seconds, the actuator would resynchronize after 112 seconds once its controller entered the Unoccupied mode.

If a controller remains in continuous Occupied mode, the actuators that it controls resynchronize approximately once every 24 hours based on the CPU clock of the controller. If a controller remains in continuous Occupied mode it resynchronizes randomly during this time period of one hour.

DISABLED Shutoff control algorithm Network input (DestManMode) containing AHU operational mode

*Available only via the network for the W7751H.

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This System Engineering Guide describes how to apply the Excel 10 family of W7751 VAV Controllers and related accessories to typical applications. The specific devices covered include:

W7751B,D,F,H Controllers.

•

T7770A through D Wall Modules.

•

T7780 Digital Display Wall Module.

•

Q7750A Excel 10 Zone Manager.

•

Q7751A,B Bus Router.

•

Q7752A Serial Adapter.

•

Q7740A,B FTT Repeaters.

•

209541B FTT Termination Module.

•

information from other E-Bus controllers that have the value of DISABLED.

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This manual is divided into three basic parts: the Introduction, the Application Steps, and the Appendices that provide supporting information. The Introduction and Application Steps 1 through 5 provide the information needed to make accurate material ordering decisions. Application Step 6 and the Appendices include configuration engineering that can be started using Excel E-Vision PC Software after the devices and accessories are ordered. Application Step 7 is troubleshooting. The organization of the manual assumes a project is being engineered from start to finish. If an operator is adding to, or is changing an existing system, the Table of Contents can provide the relevant information.

9 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

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The following list of documents contains information related to the Excel 10 family of VAV Box Controllers and the EXCEL 5000® System in general.

Form No. Title

74-2076C Excel 10 Technical Literature Collation 74-2942 Excel 10 W7751B,D,F Controller

Specification Data

74-2953 Excel 10 W7751H Smart VAV Actuator

Specification Data

74-2697 T7770A through G Wall Module

Specification Data

74-2955 T7780 Digital Display Wall Module

Specification Data

74-2868 Excel 10 C7770A Air Temperature Sensor

Specification Data

74-2950 Excel 10 Q7750A, Zone Manager

Specification Data

74-2952-1 Excel 10 Q7751A,B Router Specification

Data

74-2954-1 Excel 10 Q7752A Serial Interface

Specification Data

74-2858 Excel 10 Q7740A,B FTT Repeaters

Specification Data

74-2951 Excel 10 Q7750A Zone Manager Checkout

and Test Manual

95-7504 Excel 10 W7751B,D,F Controller

Installation Instructions

95-7538 T7770A,B,C,D,E,F,G Wall Module

Installation Instructions

95-7558 T7780 Digital Display Wall Module

Installation Instructions

95-7509 Excel 10 Q7750A Zone Manager

Installation Instructions.

95-7510 Excel 10 Q7751A,B Router Installation

Instructions

95-7511 Excel 10 Q7752A Serial Interface

Installation Instructions

95-7516 Excel 10 SLTA Connector Cable Installation

Instructions

95-7555 Excel 10 Q7740A,B FTT Repeaters

Installation Instructions

95-7554 Excel 10 209541B Termination Module

Installation Instructions

74-2588 Excel E-Vision User’s Guide 74-5587 CARE User’s Manual 74-1392 CARE Excel 10 Zone Manager User’s

Guide

74-5577 CARE Icon Guide 74-2039 XBS User’s Manual

74-5018 XBS Application Guide

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The W7751 Controller is available in four models:

W7751B VAV Box Controller for OEM mounting on a

•

VAV box. W7751D VAV Box Controller mounts on either a

•

standard 4 in. by 4 in. electrical junction box or a standard 5 in. by 5 in. electrical junction box (wire passes through junction box to wiring subbase). It can also be snapped onto standard EN 50 022 DIN rail 35 mm by 7.5 mm (1-3/8 in. by 5/16 in.). W7751F VAV Box Controller mounts into either a panel

•

with screws or snaps onto standard EN 50 022 DIN rail 35 mm by 7.5 mm (1-3/8 in. by 5/16 in.). Wires are terminated externally to wiring subbase. W7751H Smart VAV Actuator is a VAV controller that is

•

factory mounted to an ML6161B1000 Actuator. The actuator/controller assembly is field mounted to the VAV box damper shaft similar to the mounting of a standard actuator, and the controller wiring is terminated to the screw terminals that are located under a snap-on cover.

The T7770 Wall Module is available in five models:

T7770A1006 Wall Module with temperature sensor.

•

Use with Excel 5000 or Excel 10 Controllers. T7770A2004 Wall Module with temperature sensor and

•

E-Bus network connection. Use with Excel 5000 or Excel 10 Controllers. T7770B Wall Module with temperature sensor, setpoint,

•

and E-Bus network connection. Use with Excel 5000 or Excel 10 Controllers. T7770C Wall Module with temperature sensor, setpoint,

•

Bypass button and LED, and E-Bus network connection. Use with Excel 5000 or Excel 10 Controllers. T7770D Wall Module with temperature sensor, Bypass

•

button and LED, and E-Bus network connection. Use with Excel 5000 or Excel 10 Controllers.

NOTE: The T7770B,C Models are available with a

The T7780 DDWM is available in four models:

•

Other products:

• Q7750A Excel 10 Zone Manager.

• Q7751A,B Bus Router.

• Q7752A Serial Adapter.

• Q7740A,B FTT Repeaters

• 209541B FTT Termination Module

• ML6161 Series 60 Damper Actuator.

• M6410A Series 60 Valve Actuator (use with V5812 or

• ML684A Series 60 Versadrive Valve Actuator (use with

• MMC325-010 Transducer, Series 60 to pneumatic 0 to

• MMC325-020 Transducer, Series 60 to pneumatic 0 to

• ML6464A Direct Coupled Damper Actuator, 66 lb.-in.

• ML6474 Direct Coupled Damper Actuator, 132 lb.-in.

• ML6185A Direct Coupled Damper Actuator, Spring

relative scale plate adjustable in E-Vision °F (± 5°C).

T7780 DDWM displays and provides space temperature, setpoint, Occ/Unocc override, Application Mode, and Fan mode/speed selection for all Excel 10 controllers (except W7751A,C,E,G).

V5813 Valves). V5011 and V5013 Valves). 10 psi. 20 psi. torque, Series 60. torque, Series 60. Return, Series 60.

74-2949–1 10

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

• ML7984B Direct Coupled Valve Actuator, PWM (use with V5011 or V5013F,G Valves).

•

EL7680A1008 Wall Module Infrared Occupancy Sensor.

•

EL7628A1007 Ceiling Mounted Infrared Occupancy Sensor.

•

EL7611A1003 Ultrasonic Occupancy Sensor.

•

EL7612A1001 Ultrasonic Occupancy Sensor.

•

AK3781 E-Bus (non-plenum): 22 AWG (0.325 mm

) twisted pair solid conductor, non-shielded wire (one twisted pair).

•

AK3782 E-Bus (non-plenum): 22 AWG (0.325 mm

) twisted pair solid conductor, non-shielded wire (two twisted pairs).

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Table 3 provides information on agency listings for Excel 10 products.

Table 3. Agency Listings.

Device Agency Comments

W7751B,D,F Controllers

W7751H Smart VAV Actuator

UL Tested and listed under UL916 (file number E87741).

CSA Listed (LR95329-3). FCC Complies with requirements in FCC Part 15 rules for a Class A Computing Device.

Operation in a residential area may cause interference to radio or TV reception and require the operator to take steps necessary to correct the interference.

FCC Complies with requirements in FCC Part 15 rules for a Class B Computing Device.

Operation in a residential area can cause interference to radio or TV reception and require the operator to take steps necessary to correct the interference.

UL Tested and listed under UL916 (file number E87741).

cUL Tested and listed under UL916 (file number E87741).

CE General Immunity per European Consortium standards EN50081-1 (CISPR 22 Class B)

and EN 50082-1:1992 (based on Residential, Commercial, and Light Industrial). EN 61000-4-2 IEC 1000-4-2 (IEC 801-2) Electromagnetic Discharge. EN 50140, EN 50204 IEC 1000-4-3 (IEC 801-3) Radiated Electromagnetic Field. EN 61000-4-4 IEC 1000-4-4 (IEC 801-4) Electrical Fast Transient (Burst).

•

AK3791 E-Bus (plenum): 22 AWG (0.325 mm

) twisted pair solid conductor, non-shielded wire (one twisted pair).

•

AK3792 E-Bus (plenum): 22 AWG (0.325 mm

) twisted pair solid conductor, non-shielded wire (two twisted pairs).

Refer to Table 10 in Application Step 5. Order Equipment for a complete listing of all available part numbers.

NOTE: The Q7750A Zone Manager is referred to as

(E-Link) in internal software and CARE.

Radiated Emissions and Conducted Emissions. EN 55022:1987 Class B. CISPR-22: 1985.

FCC Complies with requirements in FCC Part 15 rules for a Class B Computing Device.

Operation in a residential area may cause interference to radio or TV reception and require the operator to take steps necessary to correct the interference.

T7770A through D

UL (Not applicable.)

Wall Modules

CSA (Not applicable.) FCC (Not applicable.)

T7780 DDWM CE Emissions; EN50081-1, EN55022 (CISPR 22 Class B), Immunity 50082-1

UL &cUL Tested and listed under UL916, S8L9 Energy Management Equipment.

FCC Complies with requirements in FCC Part 15 rules for a Class B Computing Device.

11 74-2949–1

(contifnued)

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Table 3. Agency Listings (Continued).

Device Agency Comments

Q7750A Excel 10 Zone Manager

Q7751A,B Router, Q7752A Serial Adapter

UL Tested and listed under UL916, file number S4804 (QVAX, PAZY).

CSA Listing pending. FCC Complies with requirements in FCC Part 15 rules for a Class A Computing Device.

Operation in a residential area can cause interference to radio or TV reception and require the operator to take steps necessary to correct the interference.

UL UL1784.

CSA Listed. FCC Complies with requirements in FCC Part 15 rules for a Class B Computing Device.

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AHU

- Air Handling Unit; the central fan system that includes the blower, heating equipment, cooling equipment, ventilation air equipment, and other related equipment.

Box

- A VAV terminal unit box.

CAV

- Constant Air Volume; a TUC that maintains a fixed air flow through the box.

- Carbon Monoxide. Occasionally used as a measure of indoor air quality.

- Carbon Dioxide. Often used as a measure of

CARE

C-Bus

CVAHU

DDWM

E-Bus

E-Bus Segment

Echelon®

Economizer

indoor air quality.

- Computer Aided Regulation Engineering; the PC based tool used to configure C-Bus and E-Bus devices.

-Honeywell proprietary Control Bus for communications between EXCEL 5000® System controllers and components.

CPU

- Central Processing Unit; an EXCEL 5000® System controller module.

cUL

- Underwriters Laboratories Canada.

-Constant Volume AHU; refers to a type of air handler with a single-speed fan that provides a constant amount of supply air to the space it serves.

DDF

- Delta Degrees Fahrenheit.

-Digital Display Wall Module.

D/X

- Direct Expansion; refers to a type of mechanical cooling where refrigerant is (expanded) to its cold state, within a heat-exchanging coil that is mounted in the air stream supplied to the conditioned space.

- Honeywell implementation of Echelon® LonWorks® network for communication among Excel 10 Controllers.

than 60 Excel 10s. Two segments can be joined together using a router.

and the Neuron® chips used to communicate on the E-Bus.

regulate the quantity of outdoor air that enters the building. In cool outdoor conditions, fresh air can be used to supplement the mechanical cooling equipment. Because this action saves energy, the dampers are often referred to as

dampers

- An E-Bus section containing no more

- The company that developed the LON® bus

- Refers to the mixed-air dampers that

economizer

EMI

- Electromagnetic Interference; electrical noise that can cause problems with communications

E-Link

EEPROM

EPROM

Excel 10 Zone Manager

NOTE: The Q7750A Zone Manager can be referred to as

Firmware Floating Control

Level IV

OEM

signals.

- Refers to the Q7750A Zone Manager. This name is used in internal software and in CARE software.

EMS

- Energy Management System; refers to the controllers and algorithms responsible for calculating optimum operational parameters for maximum energy savings in the building.

- Electrically Erasable Programmable Read Only Memory; the variable storage area for saving user setpoint values and factory calibration information.

- Erasable Programmable Read Only Memory; the firmware that contains the control algorithms for the Excel 10 Controller.

interface between the C-Bus and the E-Bus. The Excel 10 Zone Manager also has the functionality of an Excel 100 Controller, but has no physical I/O points.

E-Link in the internal software, CARE.

- Software stored in a nonvolatile memory

medium such as an EPROM. of a valve or damper. Floating Control utilizes one

digital output to pulse the actuator open, and another digital output to pulse it closed.

IAQ

- Indoor Air Quality. Refers to the quality of the air in the conditioned space, as it relates to occupant health and comfort.

I/O

- Input/Output; the physical sensors and actuators connected to a controller.

I x R

- I times R or current times resistance; refers to Ohm’s Law: V = I x R.

- Degrees Kelvin.

- Refers to a classification of digital communication wire. Formerly known as UL Level IV, but there is any question about wire compatibility, use Honeywell-approved cables (see Step 5 Order Equipment section).

-Original Equipment Manufacturer; the company that builds the VAV boxes.

- Refers to Series 60 Modulating Control

not

- A controller that is used to

equivalent to Category IV cable. If

74-2949–1 12

NEC

- National Electrical Code; the body of standards

NEMA

Node

PWM

Subnet

W7751 Wall Module

for safe field-wiring practices.

- National Electrical Manufacturers Association; the standards developed by an organization of companies for safe field wiring practices.

- A Communications Connection on a network; an Excel 10 Controller is one node on the E-Bus network.

- Network Variable; an Excel 10 parameter that can be viewed or modified over the E-Bus network.

- An IBM compatible Personal Computer with 386 or higher processor and capable of running Microsoft® Windows™ Version 3.1.

Pot

- Potentiometer. A variable resistance electronic component located on the T7770B,C Wall Module; used to allow user-adjusted setpoints to be input into the Excel 10 Controller.

- Pulse W i dth Modulated output; allows analog modulating control of equipment using a digital output on the controller.

RTD

- Resistance Temperature Detector; refers to a type of temperature sensor whose resistance output changes according to the temperature change of the sensing element.

- An E-Bus segment that is separated by a router from its Q7750A Zone Manager.

TOD

- Time-Of-Day; the scheduling of Occupied and Unoccupied times of operation.

TCU

- Terminal Control Unit; industry can refer to VAV box controllers such as the Excel 10 VAV Controller as TCUs.

TUC

- Terminal Unit Controller; industry can refer to VAV box controllers such as the Excel 10 VAV Controller as TUCs.

- Volt Amperes; a measure of electrical power output or consumption as applies to an ac device.

Vac

- Voltage alternating current; ac voltage rather than dc voltage.

VAV

- Variable Air Volume; refers to either a type of air distribution system, or to the W7751 Excel 10 VAV Box Controller that controls a single zone in a variable air volume delivery system.

VOC

- Volatile Organic Compound; refers to a class of common pollutants sometimes found in buildings. Sources include out-gassing of construction materials, production-line by-products, and general cleaning solvents. A VOC is occasionally used as a measure of indoor air quality.

-The model number of the Excel 10 VAV Box Controllers (also see VAV).

- The Space Temperature Sensor and other optional controller inputs are contained in the T7770 or T7780 Wall Modules. See Application Step 5. Order Equipment for details on the various models of Wall Modules.

XBS

- Excel Building Supervisor; a PC based tool for monitoring and changing parameters in C-Bus devices.

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

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Variable air volume (VAV) ATUs are commonly called VAV boxes. Each VAV box has a controller that controls the temperature of a room or zone by modulating a damper in the VAV box to vary the amount of conditioned air supplied to the zone rather than changing the temperature of the conditioned air. They are used in larger buildings that have many zones along with a central air handling fan that supplies conditioned air via a pressurized main air duct system. The central air handling fan has a separate equipment controller that controls discharge air temperature, humidity, and supply duct static pressure.

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Air terminal units (ATUs) regulate the amount of conditioned air delivered to satisfy the temperature requirements of a room or space. ATUs are classified by air handling system design and are available in several configurations. ATUs may be of variable air volume or constant volume design, and may be used in single-duct or dual-duct air handling systems. ATU controls can be as basic as a room thermostat controlling a damper or a more complex direct digital controller operating a damper, a terminal fan and enabling a reheat coil. In all cases, each ATU has a controller that is used to control the environment of the room or space.

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Static pressure variations in an air handling system can affect terminal unit operation. Pressure-dependent terminal units are affected by changing duct static pressures because their damper position is determined by space temperature only. They may have mechanical or electric minimum and maximum air flow limits. Pressureindependent terminal units can automatically adjust to duct pressure changes because they contain air flow sensors and the controllers compensate for pressure changes in the main air distribution system. The damper position in pressure independent terminal units is determined by both space temperature and air flow volume.

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Variable air volume (VAV) ATUs are commonly called VAV boxes. Each VAV box has a controller that controls the temperature of a room or zone by modulating a damper in the VAV box to vary the amount of conditioned air supplied to the zone rather than changing the temperature of the conditioned air. They are used in larger buildings that have many zones along with a central air handling Unit (AHU) that supplies conditioned air via a pressurized main air duct system.

13 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

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Single duct VAV systems are used in over 80 percent of the VAV applications and employ one main supply air duct from the central air handling system. The air handling unit supplies cool air virtually one hundred percent of the time, with the only exception being a morning warm-up cycle that is used in buildings that are not continuously occupied, that temporarily raises the discharge air temperature of the central air handling system to quickly warm the building from its unoccupied zone temperatures to the occupied zone temperatures. Since the central air handling system is usually supplying cool air, single or multiple electric reheat coils or a modulating hot water (hydronic) reheat coil are often added in the VAV box discharge air duct to reheat the cool air when the zone becomes too cold. VAV boxes with reheat coils typically have a series or parallel fan in the VAV box to ensure air flow across the coil in the heating mode.

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Pressure dependent throttling VAV boxes are the simplest and least expensive ATU. A controller modulates a damper actuator according to the temperature in the zone. The pressure dependent VAV box usually has minimum and/or maximum damper position setpoint stops in the controller for limiting air volume. Because the unit is pressure dependent, the volume of air distributed to the zone at any given space temperature varies with the supply duct static pressure at the inlet of the VAV box. Maintaining a stable duct static pressure is important for proper operation and proper setting of the minimum damper position setpoint stop is essential for adequate circulation. When reheat coils and/or finned tube radiation are used the controller will set the damper position at a minimum position during the heating mode to ensure some air flow into the space and optimize heat transfer from the reheat coil. Pressure dependent VAV boxes are used in smaller buildings or in areas of larger buildings where the supply duct static pressure is low and stable.

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Pressure-independent or variable constant-volume VAV boxes are essentially air flow control devices that deliver a constant volume of air to a conditioned space at a given temperature despite a varying supply duct static pressure. An air flow sensor in the inlet of the VAV box is used to measure the volume of air and the

resets the air flow volume setpoint as the thermal load changes in the space

VAV box controller provides two control sequences; zone temperature control and terminal unit air flow control. The controller usually has a minimum air flow setpoint to maintain air flow at light load conditions and a maximum air flow setpoint to limit the air flow to meet the design conditions for the zone. A single zone sensor can be used to control multiple VAV boxes with differing volume ratings. When reheat coils and/or finned tube radiation are used with this unit the controller will lower the air flow setpoint during the heating mode to ensure air flow into the room and optimize heat transfer from the reheat coil. Pressure independent VAV boxes are used in buildings with larger air handling systems that have constant duct static pressure fluctuations due to the large number of zones.

. Therefore, a pressure independent

VAV box controller

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Series Fan-powered VAV boxes are similar to pressure dependent and/or pressure independent VAV boxes, except they include an integral fan in series with the VAV box discharge duct that recirculates space air at constant volume and enhances the air distribution in the zone. Primary air is modulated by the VAV box damper to meet space demand for cooling and as primary air modulates down, more plenum air is drawn in by the fan to maintain a constant discharge volume to the zone. Typically the series fan is on continuously during occupied hours, or it can be programmed to be activated as primary air decreases to ensure adequate air circulation. In addition to enhancing air distribution, the units serving the perimeter area of a building usually include a reheat coil that is sequenced with the primary air damper to supply heat when required. When the primary air system is not operating (nighttime or unoccupied control mode), the night operating mode of the controller enables the fan and the reheat coil to maintain the lower unoccupied temperature setpoint in the space. Series Fan Powered VAV boxes can be pressure independent or pressure dependent.

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Parallel Fan Powered VAV boxes or Bypass Fan Induction Terminal Units are similar to Series Fan-powered VAV terminal units, except the fan is located in the return plenum and does not run continuously during occupied hours. When the zone temperature is low and the need for primary air decreases, the controller modulates the primary air damper to a minimum and enables the fan, which recirculates warm air from the return plenum into the zone acting as the first stage of reheat. If a reheat coil is used the fan is cycled on when the reheat coil is enabled. As the space warms, the reheat valve closes and the fan cycles off as the primary air damper opens to allow delivery of conditioned air from the air handling system. When heating is required in the unoccupied mode, the fan at the central air handling system remains off , the VAV box fan and the reheat coil are enabled and the zone is heated to a reduced night setback temperature using air from the return air plenum. Parallel Fan Powered VAV boxes can be pressure independent or pressure dependent.

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Induction VAV boxes use induced return air as the reheat medium which means no parallel fan is present in the VAV box. Induction VAV boxes are usually installed above the ceiling and draw return air from the plenum created by a false ceiling. The VAV box controller uses an air flow sensor for controlling air flow and a room sensor for controlling room temperature similar to pressure independent VAV boxes. The volume of air coming through the primary damper is controlled by positioning both dampers simultaneously so that as the primary air damper closes, the return air damper opens. Return air is thus drawn into the unit and recirculated into the space. Like pressure independent VAV boxes the controller resets the air flow setpoint of the controller as the thermal load changes in the conditioned space. For extremely cold design conditions, a reheat coil can be added.

74-2949–1 14

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

The induction VAV ATU maintains satisfactory air motion at lower loads than a throttling VAV box can, however, the wide use of Parallel Fan Powered VAV boxes has now limited the use of Induction VAV boxes.

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Single-Duct Constant Volume Zone Reheat Systems are used in low static pressure systems and have a heating coil (hot water, steam, or electric) in the branch supply duct to each zone. The central air-handling unit supplies constant temperature air and a manual balancing damper in each zone is set in a fixed position to determine the amount of air delivered to that zone. The volume of air delivered to each zone will change as the static pressure of the supply duct changes, however, in low static pressure systems the changes in the supply duct static pressure are small and do not have a dramatic effect on the amount air delivered to the zone. The control strategy used in single zone reheat systems is simple and involves activating electric heat or positioning a valve in conjunction to the zone temperature. In most cases this is accomplished using a simple space thermostat. However, direct digital controllers can be used in these cases to control multiple zone valve positions the reheat coil valve (or electric heating elements) as required to maintain space condition.

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In a dual-duct air handling system, supply air is divided at the central fan and hot air and cold air flow through separate ducts to the perimeter zones in the building. Dual-duct terminal units are essentially mixing boxes with two supply inlets and one discharge outlet. The air is allowed to mix in the mixing box section and is discharged out of a single duct into the zone. Since a source of heating is available reheat coils are not used in the zone. Basic dual-duct mixing systems were not economical because supply air was cooled and heated year round and modern energy codes prohibited their use in many cities in the U.S. except in critical applications like hospitals, nursing homes, etc. However, with direct digital controllers and networked systems the individual zone data can be used to reset hot and cold duct temperatures as needed, allowing dual duct systems to be used more often in todays applications. Dual duct systems are often used in conjunction with single duct systems in the same building.

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Variable Constant Volume (Zero Energy Band) Dual-Duct VAV Boxes have inlet dampers (with individual damper actuators and air flow sensors) on the cooling and heating supply ducts. The air flow is pressure independent and the Dual Duct VAV Box controller uses the zone temperature to determine the required flow of hot and cold air from the respective ducts into the mixing box and resets the hot duct and cold duct air flow setpoints in sequence as space load changes. The Zero Energy Band (ZEB) is an energy conservation technique that allows temperatures to float between programmable settings to prevent the consumption of heating or cooling energy while the temperature is in this range. As space temperature rises to approach the controller setpoint, the hot air flow volume drops to zero. If space temperature continues to rise

through the ZEB, the output signal from the controller modulates the cold-air damper open. The controller maintains adjustable minimum flows for ventilation, with no overlap of damper operations, during the ZEB when neither heating nor cooling is required. For example, if a zone had a setpoint of 74 degrees and a zero energy band of 2 degrees then the zone temperature would be allowed to float between 73 degrees and 75 degrees before the controller would use hot air to heat the zone or cool air to cool the zone. When the ZEB technique is properly used the comfort of the occupants is not sacrificed in the process of saving energy.

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Dual-duct mixing box terminal units

Dual-duct mixing box terminal units generally apply to lowstatic pressure systems that require large amounts of ventilation. The warm duct damper and the cool duct damper are linked to operate in reverse of each other from a single damper actuator. The controller positions the mixing dampers through a damper actuator to mix warm and cool supply air to maintain space condition. Discharge air quantity depends on the static pressure in each supply duct at that location.

Dual-duct constant volume mixing box terminal units

Dual-duct constant volume mixing box terminal units typically used on high-static-pressure systems where the air flow quantity to each space is critical. The units are the same as those described in the previous paragraph, except that they include either an integral mechanical constant volume regulator or an air flow constant volume control furnished by the unit manufacturer to change the damper position to maintain a constant air flow volume with changes in duct static pressure.

are

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VVT systems are also called commercial zoning systems and use a constant volume air supply (roof top unit, heat pump, small air handler) with heating, cooling and economizer functions and vary the flow rates and supplyair temperature into smaller, damper-controlled zones through a single duct distribution system. Each zone damper is modulated based on space temperature. However, damper control is based only on zone temperature and there is no flow control at the zone level as there is in a pressure independent variable air volume (VAV) system. Typically, the zone damper is modulated using an analog signal, providing excellent zone temperature control. A method of providing feedback of zone demand is provided which allows a controller at the rooftop to provide the minimum required amounts of heating and cooling (using economizer when acceptable) based on zone demand.

Because a number of zone dampers can possibly be closed, there needs to be a way to relieve pressure in the supply duct. A bypass damper is normally added in a duct between the supply and return ducts to relieve pressure. The pressure relief damper is normally controlled by sensing supply duct pressure and opening to vent supply air directly to return. This is one difference between a commercial zoning system and true VAV. A true VAV air handler actually varies air volume through the blower.

15 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

VVT makes it possible to operate a single-zone heating/cooling unit with multiple-zones and is often used in smaller buildings. Small buildings are not appropriate for VAV systems because the heating and cooling loads are not large enough for a VAV system to operate properly. VVT systems also cost less than VAV systems due to the use of constant volume packaged units, lower pressure ductwork, and they often do not require expensive perimeter heat. The main difference between VAV and VVT is the fact that VAV systems vary the amount of air entering a zone and not the temperature, where a VVT system varies both the amount of air and the temperature of the air entering the zone.

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Single-zone systems use a Constant Volume Air-Handling Unit (CVAHU) which are usually factory-packaged units mounted on the rooftop of the building, however, single zone air handling units can also be located in a mechanical room of buildings. Single zone units are used in smaller buildings, buildings that have a uniform heating/cooling load in large open zones, or in zones that have special comfort requirements that are different from other areas of the building. The building must also have the space available for the associated air handling equipment. Typical installations include; office/warehouse buildings, large open buildings such as supermarkets, restaurants, and ballrooms and lobbies of large buildings and hotels. Since single zone units are associated with only one zone, many single zone air handling units can be installed in a building. Fan volume control, as found in Variable Air Volume systems is not required, because fan volume and duct static pressure are set by the manufacturer to meet the design needs of the zone.

Temperature and Ventilation Control

A single space controller or thermostat controls the heating coil, ventilation dampers, and cooling coil in sequence as thermal load varies in the conditioned space. On rooftop mounted units the heating coils are typically electric and the cooling is by a self contained air-conditioning system using direct expansion cooling coils. However, single zone air handling systems that are located in a mechanical room of a building often employ hot water (hydronic) heating coils and use chilled water coils for cooling. The ventilation dampers (Outdoor air, Return air, and Exhaust air) are controlled to use outdoor air for the first-stage cooling when the conditions are appropriate. When outdoor air temperature or heat content (enthalpy) rises to the point that it can no longer be used for cooling, an outdoor air limit control overrides the signal to the ventilation dampers and moves them to the minimum ventilation position, as determined by the minimum positioning switch or the minimum position setpoint in the controller. Indoor air quality control is also accomplished with the Single Zone controller using sensors and control strategies that increase the minimum position of the outdoor air damper to allow more fresh air into the building when the indoor air quality is poor. A zero energy band often separates the heating and cooling control ranges, thus saving energy.

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Unitary equipment includes natural convection units, radiant panels, unit heaters, unit ventilators, fan coil units, and heat pumps. Unitary equipment does not require a central fan. Depending on design, unitary equipment may perform one or all of the functions of HVAC - ventilation, filtration, heating, cooling, humidification and distribution. Unitary equipment frequently requires a distribution system for steam or hot and/or chilled water.

Control of unitary equipment varies with system design. Typically, a room thermostat provides a signal to a controlled device to regulate the unit. The unit may use a day/night thermostat for operation at lower setpoints during unoccupied hours. If the unit has a fan, a time clock may be used to turn the fan off at night, and a night thermostat may be used to control the temperature within night limits. When DDC control is used all of the thermostat and time clock functionality is contained in the controller.

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The Excel 10 VAV Controller is available in four different models. The W7751B circuit board is ready to be snapped into a section of standard 3.25 in. (82 mm) by 9 in. (228 mm) snaptrack, part number 207912. The W7751B model is intended for OEM installation on VAV boxes at the factory. Connections to the wall module terminals (19 through 23) and the E-Bus communications terminals (29 and 30) are made at screw terminal blocks. Connection for access to the E-Bus is provided by plugging the connector into the communications jack. All other connections are made with quarter inch (6.35 mm) quick connects. See Fig. 4.

The W7751D and W7751F models both use the identical 5 in. by 5 in. circuit board contained in the housing cover. This cover can plug into either the W7751D or F Subbase. The W7751D Subbase allows screw terminations to be made on the inside. This subbase either mounts on a standard 4 in. by 4 in. or a standard 5 in. by 5 in. electrical junction box. It can also be snapped onto standard EN 50 022 DIN rail 35 mm by 7.5 mm (1-3/8 in. by 5/16 in.). For W7751D, see Fig. 5. The W7751F Subbase provides screw terminations to be made on the outside. This subbase either mounts on a panel with screws or snaps onto standard EN 50 022 DIN rail 35 mm by 7.5 mm (1-3/8 in. by 5/16 in.). DIN rail is available through local suppliers. Wires are attached to screw terminal blocks on the top and bottom of the subbase. For W7751F, see Fig. 6.

The W7751H Smart VAV Actuator is a physically smaller Excel 10 VAV Controller. The controller enclosure, which contains the controller circuit board, is constructed of a sheet metal housing and a plastic snap-on cover. The sheet metal housing is attached at the factory to the ML6161B Actuator and has two 1/2 in. (13 mm) knockouts that are compatible with 1/2 in. (13 mm) or 3/4 in. (19 mm) conduit, see Fig. 7. The actuator on the Smart VAV Actuator is field mounted to the VAV box damper shaft and its controller wiring is terminated to screw terminals located at the bottom under a snap-on cover.

74-2949–1 16

CAUTION

W7751B,D,F Controllers must be mounted vertically as shown in Fig. 4 through 6. Vertical mounting assures adequate air flow for proper heat dissipation in the controller.

The W7751H Smart VAV Actuator is intended for horizontal shaft mounting only for heat dissipation needs.

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

1-3/32

(28)

4 X 4

MOUNTING

HOLES

3/4 (19)

IMPORTANT

If controller flow sensors are connected to unusually dusty or dirty environments, a 5-micron disposable air filter is recommended for use in the high pressure line (marked as air flow pickup. This applies to all controller models. See Table 10 for filter ordering information.

(76)

Fig. 4. W7751B construction in in. (mm).

) connected to the

∆P

–

9 (228)

W7751B

KEEP WIRING ROUTED AWAY FROM THIS HIGH

RADIATION AREA TO AVOID INTERFERENCE PROBLEMS WITH OTHER EQUIPMENT.

M11820

5 X 5

MOUNTING

HOLES

1-1/2

(38)

2-11/32 (60)

1/2

(13)

4-21/32 (118)

3-7/16

(87)

1-3/32

(28)

1-3/8 (35)

DIN RAIL

MOUNTING

SLOT

M11821

Fig. 5. W7751D construction in in. (mm).

17 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

5 X 5

MOUNTING

HOLES

1-1/2

(38)

2-11/32 (60)

1/2

(13)

1-3/32

(28)

4 X 4

MOUNTING

HOLES

4-21/32 (118)

3/4

(19)

3-7/16

(87)

1-3/32

(28)

1-3/8 (35)

DIN RAIL

MOUNTING

SLOT

M11822

Fig. 6. W7751F construction in in. (mm).

74-2949–1 18

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

MAINTAIN A MINIMUM DISTANCE OF 3 IN. (76 MM) FROM OTHER DEVICES OR PANELS FOR REMOVING CONTROLLER COVER

1-13/16 (46)

1-5/16 (33)

DE-CLUTCH LEVER

3-3/4 (95)

MAINTAIN A MINIMUM DISTANCE OF 4 IN (100 MM) FROM OTHER DEVICES OR PANELS FOR ATTACHING PNEUMATIC AIR FLOW TUBING

60°

4-1/16 (103)

CCW

45°

3-5/8 (92)

CCW

45°

(25)

60°

1-13/16

(46)

5-7/8 (149)

Fig. 7. W7751H construction in in. (mm).

Performance Specifications Power:

24 Vac with a minimum of 20 Vac and a maximum of 30 Vac at either 50 or 60 Hz.

CPU:

Motorola or Toshiba 3150 Neuron processor, containing three eight-bit CPU’s. Each Neuron has a unique 48-bit network identification number.

Memory Capacity:

64K ROM/PROM in W7751B,D,F,H 512 EEPROM 2K RAM

Specified Space Temperature Sensing Range:

45° to 99°F (7° to 37°C) with an allowable control setpoint range from 50° to 90°F (10° to 32°C) when initiated from the network and 55° to 85°F (13° to 29°C) when configured and connected to a T7770 Wall Module or T7780 DDWM.

3-3/4

(95)

2-1/8

(54)

3/4

(19)

DE-CLUTCH LEVER

1-15/16 (49)

3/4

(19)

M10523

Communications

The W7751B,D,F,H Controller uses a transformer-coupled communications port with differential Manchester-encoded data at 78 kilobits per second (kbs). The transformercoupled communications interface offers a much higher degree of common-mode noise rejection while ensuring dc isolation.

Approved cable types for E-Bus communications wiring is Level IV 22 AWG (0.34 mm

) plenum or non-plenum rated unshielded, twisted pair, solid conductor wire. For nonplenum areas, U.S. part AK3781 (one pair) or U.S. part AK3782 (two pair) can be used. In plenum areas, U.S. part AK3791 (one pair) or U.S. part AK3792 (two pair) can be used (see Tables 9 and 10 for part numbers). Contact Echelon Corp. Technical Support for the recommended vendors of Echelon approved cables.

19 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

The FTT supports a polarity insensitive, free topology wiring scheme that supports star, loop, and/or bus wiring. The maximum bus length when using a combination of star, loop, and bus wiring (singly terminated) is 1640 ft (500m) with the maximum node to node length of 1312 ft (400m). In the event that the limits on the number of nodes or total wire length is exceeded, then a 2-way repeater (Q7740A) can be used to double the node count and the network length or a 4-way repeater (Q7740B) can quadruple the node count and the network length. The maximum number of repeaters per segment is one. A Q7751A E-Bus Router can also be used to effectively double the maximum bus length. The advantage of using the router is that it will segregate traffic to a segment whereas with the repeater all traffic is repeated on each segment. On a doubly terminated E-Bus utilizing bus wiring (continuous daisy-chain with no stubs or taps from the main backbone) the maximum bus length is 4593 ft (1400m) with the maximum node to node length of 3773 ft (1150m).

FTT networks are very flexible and convenient to install and maintain, but it is imperative, to carefully plan the network layout, and create and maintain accurate documentation. Unknown or inaccurate wire run lengths, node to node distances, node counts, total wire length, and misplaced or missing terminators can cause poor network performance. Refer to E-Bus Wiring Guidelines form, 74-2865 for complete description of network topology rules.

LonMark Functional Profile

W7751 Controllers support the LonMark Functional Profile number 8010 VAV Controller, version 1.0 (see Fig. 8).

Environmental

nviSpaceTemp

nv1

SNVT_temp_p

nviSetPoint

nv2

SNVT_temp_p

nviApplicMode

nv5

SNVT_hvac_mode

nviManOverride

nv6

SNVT_hvac_overid

nviSetpointOffset

nv7

SNVT_ temp_p

nviOccCmd

nv8

SNVT_occupancy

nviEnergCmd

nv9

SNVT_hvac_energ

nviBoxFlow

nv10

SNVT_ flow

nviEnergyHoldOff

nv11

SNVT_switch

nviFanSpeed

nv12

SNVT_switch

nviCO2

nv13

SNVT_ppm

nviHeaterOverid

nv14

SNVT_switch

nviDuctIn Temp

nv15

SNVT_temp_p

Hardware

Outputs

VAV Device

Object Type # 8010

Mandatory Network Variables

Optional Network Variables

nvoSpaceTemp

nv3

SNVT_ temp_p

nvoUnitStatus

nv4

SNVT_hvac_status

nvoEffectSetPt

nv16

SNVT_ temp_p

nvoFlowControlPt

nv17

SNVT_ flow

nvoBoxFlow

nv18

SNVT_ flow

nvoTerminalLoad

nv19

SNVT_lev_percent

nviEnergyHoldOff

nv20

SNVT_switch

Operating Temperature:

-40° to 150°F (-40° to 65.5°C).

Shipping Temperature:

-40° to 150°F (-40° to 65.5°C).

Relative Humidity:

5 percent to 95 percent noncondensing.

Vibration:

Rated V2 level compliant.

Hardware:

The Excel 10 VAV Box Controllers are available in four models, the W7751B circuit board only, W7751D Plenum version with internal screw connections an the subbase for conduit installations, W7751F Plenum version with external screw connections on the subbase for nonconduit installations, and the W7751H Smart VAV Actuator which in an Excel 10 VAV Box Controller mounted and wired to a ML6161B (90 second) actuator.

Configuration Properties

nc49 - Send Heartbeat (mandatory) nc60 - Occupancy Temperature Setpoints

nc52 - Minimum Send Time nc17 - Location nc46 - Duct Area nc54 - Minimum Flow nc51 - Maximum Flow (mandatory) nc55 - Minimum Flow for Heat nc56 - Minimum Flow Standby nc57 - Nominal Flow nc66 - VAV gain

(mandatory)

(optional)nc48 - Maximum Receive Time (optional) (optional) (optional)

(mandatory)

(optional) (optional) (optional) (optional)

Manufacturer

Defined Section

Hardware

Input

M11823

Fig. 8. Functional profile of LonMark compliant VAV

object details (variables not implemented in Excel 10

VAVII are greyed).

74-2949–1 20

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Inputs/Outputs

The W7751B,D,F and H controllers have the following inputs and outputs:

Analog inputs - 4 total on W7751B,D,F, 3 total on

W7751H.

Space temperature sensor (fixed location) - T7770 A

through D or T7780 DDWM

Duct velocity pressure sensor (fixed location)-

Microbridge 0-2 inch velocity pressure sensor

Configurable analog input options, 2 from the 3 listed below on W7751B,D,F,

1 from the 3 listed below for

W7751H.

•

Setpoint Potentiometer: 55° to 85°F (13° to 29.5°C) )—(9846 to 1290 ohms).

•

Discharge Air Temperature Type: RTD (NTC). Supported Sensors: C7770A1006, C7031C1031, C7031B1033, C7031J1050.

•

Supply Air Temperature Type: RTD (NTC). Supported Sensors: C7770A1006, C7031C1031, C7031B1033.

NOTE: The C7770 or C7031 Air Temperature Sensors or

Digital Inputs

5 total on W7751B,D,F, 1

the wall module Bypass pushbutton)

are sensed using a 9 milliamp at 4.8 volts detection circuit. It is very important that the device used contains high quality, non-corroding contacts with resistivity that does not degrade; that is, increase over time. Use noble metal (such as gold or silver), pimpled or sealed contacts to assure consistent, long-term operation.

•

the setpoint potentiometer options are selectable in CARE/E-Vision. (Either one or the other, but not both are allowed on the W7751H.)

on the W7751H (reserved for

. Dry-contact inputs

Wall Module Bypass Pushbutton—Momentary DI (Fixed location - See Appendix B—Sequences of Operation for bypass details.) Hardware test (Fixed location - not available on the W7751H). Three of the following Digital Inputs (DIs) can be configured when using the W7751B,D,F, (not available on the W7751H): Window Monitor—Contact Closed = Window is Closed Occupancy Switch—Contact Closed = Room is Occupied; Contact Open = Room is Unoccupied Heat/Cool change over—Contact Closed = Heat Monitoring input—Contact Closed = input off or closed (input reportable on network).

Digital Outputs:

8 total on W7751B,D,F (configurable locations), 4 total on W7751H (2 fixed position damper outputs and 2 configurable outputs). Configurable digital output options.



Floating damper open (fixed location on W7751H)



Floating damper closed (fixed location on W7751H)



Reheat types Reheat (floating) valve open Reheat (floating) valve closed PWM Stage 1 Stage 2 or Three stage binary control Stage 3 (not available on W7751H)



Peripheral Heating types Peripheral heat (floating) valve open Peripheral heat (floating) valve closed PWM Stage 1



Fan (Series or Parallel) On/Off PWM



Auxiliary (On when occupied, Off when unoccupied or Standby) Normal (On/Off) Pulsed (requires two pairs open and closed)



Network (up to 2 outputs commanded from the network) Normal (On/Off) Pulsed (requires two pairs open and closed)

Triac Outputs on the W7751B,D,F Model:

Power ratings: 20 Vac to 30 Vac at 25 mA MIN to 1.0A

MAX current for any voltage.

(For W7751H, a minimum of 25 mA at 20 Vac and a

maximum of 400 mA at 30 Vac.)

CAUTION

When any device is energized by a Triac, the device must be able to sink a minimum of 25 mA.

NOTE: Triacs sink current to the 24 Vac common

LED:

(For Wall Module LED only) 2.5V at 3 mA.

(terminals 10 on the W7751B model, see Fig. 60, or terminals 2 and 4 on the W7751D,F models, see Fig. 66, or terminal 2 on the W7751H model, see Fig. 72). The controller and all Triac loads must be wired to the same 24 Vac source.

IMPORTANT:

If non-Honeywell motors, actuators, or transducers are to be used with Excel 10 Controllers, Triac compatibility must be verified (see previous NOTE).

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The T7770 Wall Module for the Excel 10 Controller is available in a variety of configurations (see Product Names section). The models are shown in Fig. 9.

21 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

3-5/32 (80)

KNOCKOUTS FOR EUROPEAN APPLICATIONS

29/32 (23)

5-1/16 (128)

3-5/32 (80)

KNOCKOUTS FOR EUROPEAN APPLICATIONS

1-1/4 (32)

5-1/16 (128)

2-3/8 (60)

STANDARD UTILITY CONDUIT BOX (2 X 4) MOUNTING HOLES

9 8 7 6 5 4 3 2 1

W7752

DIP Switch S4 Settings:

XL600-XL20

LED

LED RETURN

SETPT

SENSOR

GND

BYPASS/FAN BYPASS/FAN

SETPT

SENSOR

AL COM

T7770A1006

W7753

BYPASS

LED

FAN

SETPT

SENSOR

1,3,5=on; 2,4=off 2,4=on; 1,3,5=off 1,2,3,4=on; 5=0ff

GND

Fig. 9. T7770A,B,C,D construction in in. (mm) sensor only.

E-BUS

T7770C

2-3/8 (60)

STANDARD UTILITY CONDUIT BOX (2 X 4) MOUNTING HOLES

M15119

74-2949–1 22

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

3-5/32 (80)

2-3/8 (60)

KNOCKOUTS FOR EUROP EAN APPLICATIONS

2-3/8 (60)

STANDARD UTILITY CONDUIT BOX(2 BY 4) MOUNTING HOLES

1 (25)

5-1/16 (128)

6HQVRU'XFW0RXQW

The C7770A Air Temperature Sensor is used for duct temperature sensing with Excel 10 Controllers (see Product Names section). The C7770A Air Temperature Sensor is shown in Fig. 11.

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Table 4 provides an overview of the Excel 10 VAV Controller configuration options. All VAV boxes are assumed to have an air flow pickup for connecting to the Microbridge flow through pressure sensor on the Excel 10 VAV Controller. Also, each box must have a flowregulating damper that is controlled by a Series 60 (floating) type actuator such as the Honeywell ML6161 or a PWM type actuator. Table 5 lists the general mechanical equipment options available with the W7751 VAV Box Controller. See Table 1 for Excel 10 VAV Box Controller capabilities. See Application Step 6. Configure Controllers for further information on configurations.

CAUTION

The Excel 10 VAV Controller is designed to work with Series 60 (floating) Damper Actuators that have a full stroke damper actuator time between 20 and 600 seconds (0.333 to 10 minutes) or PWM Damper Actuators that have a minimum time (zero percent) of 0.1 second and a maximum overall time of 600 seconds (0.1 second to 10 minutes).

The W7751H Excel 10 VAV Controller is designed to work only with the Series 60 (floating) Damper Actuator (ML6161B) that has a full stroke damper actuator time of 90 seconds.

M11751

Fig. 10. T7780 construction in in. (mm) sensor.

1-1/2 (38)

3/4 (19)

1/4 (6) DIAMETER (2 HOLES)

7/8

(22)

8-1/2 (216)

1/2 (13)

Fig. 11. C7770A construction - in. (mm).

1/2 (13)

1/2 IN. (13) DIAMETER

3/8 IN. (10) DIAMETER

6-5/32 (156)

3-1/2 (89)

M7724

23 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Table 4. Excel 10 VAV Box Controller Capability.

Excel 10 VAV Box

Controller Capability W7751B,D,F W7751H

Fan

None X X Series X X Parallel Temp X X Parallel Flow X X Parallel PWM X X

Reheat

None X X One Stage Reheat X X** Two Stages or Three Stage

Binary Control Reheat Three Stages Reheat X — One Stage Periph X X** Floating Reheat (Two outputs) X X** Floating Periph (Two outputs) X X** Floating Reheat then Periph

(Four outputs) Floating Periph then Reheat

(Four outputs) PWM Reheat (One output) X X** PWM Periph (One output) X X** PWM Reheat then Periph

(Two outputs) PWM Periph then Reheat

(Two outputs)

Exhaust Tracking

Disabled X X Enabled X X

Occupancy Sensor

None X X Connected X —*

XX**

X—

XX**

Excel 10 VAV Box

Controller Capability W7751B,D,F W7751H

Window Contact None X X Connected X —*

Wall Module Configuration

Local X X Shared X X

Wall Module Type

Sensor Only X X Sensor and Setpoint X X Sensor, Setpoint and Bypass X X Sensor and Bypass X X

Air Temperature Sensor

20 K ohm air temperature sensors can be used in conjunction with wall modules

Dual Duct Pressure

Independent Flow mixing

Cold and hot duct flow

pickups

Without flow mixing

Cold and hot duct flow

pickups

Constant volume

Cold and hot duct flow

pickups With cold duct pickup only X X Constant volume with

discharge pickup only

Dual Duct Pressure

Dependent

With flow mixing X X Without flow mixing X X

X*** X***

X**** X****

* Available only via the network for the W7751H.

** The W7751H Smart VAV Actuator provides damper control and two configurable outputs available for 2 stages of

reheat, floating reheat (requires two outputs), PWM Reheat or Periph (requires one output), PWM Reheat and Periph (requires two outputs) or 1 stage of reheat or Periph (an be PWM) and a serial or parallel fan.

*** These applications require two W7751 Excel 10 controllers per zone.

**** Flow sensor in discharge air. The temperature control loop controls the cool damper position and the flow controls

adjust the heating damper position.

74-2949–1 24

Option

Fan

Type of Reheat Coil

Type of Peripheral Heat*

Window Open Option

Monitor switch Option

Occupancy Sensor Option

Heat/Cool change over switch Option

Wall Module Option

Wall Module Type

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Table 5. Configuration Options Summary For W7751 Controllers.

Possible Configurations for the W7751B,D,F

1. None 1. None

2. Parallel Temperature 2. Parallel Temperature

3. Parallel Flow 3. Parallel Flow

4. Parallel PWM 4. Parallel PWM

5. Series 5. Series

1. One stage 1. One stage

2. Two stages or Three Stage Binary 2. Two stages or Three Stage Binary

3. Three stages 3. Series 60 Modulating electric valve, or pneumatic

4. Series 60 Modulating electric valve, or pneumatic via transducer.

5. Pulse Width Modulating electric valve, or pneumatic via transducer.

6. None

1. One stage 1. One stage

2. Series 60 Modulating electric valve, or pneumatic via transducer.

3. Pulse Width Modulating electric valve, or pneumatic via transducer.

4. None 4. None

1. None 1. None

2. Local Window Open Digital Input - directly wired to the controller. (Contacts closed means Window Closed.)

3. Network (DestWndw signal received via the E-Bus).

1. None 1. None

2. Local Monitor switch (general purpose) Digital Input -directly wired to the controller. (Contacts closed means that the switch is closed.)

1. None 1. None

2. Local Occupancy sensor Digital Input - directly wired to the controller. (Contacts closed means occupancy sensed.)

3. Network (DestOccSensor signal received via the E-Bus).

1. None 1. None

2. Local Heat/Cool change over switch Digital Input directly wired to the controller. (Contacts closed means select Heat Mode.)

1. Local (direct wired to the box) 1. Local (direct wired to the box)

2. Shared (wired to another box) 2. Shared (wired to another box)

1. Sensor only 1. Sensor only

2. Sensor and Setpoint adjust 2. Sensor and Setpoint adjust

3. Sensor, Setpoint adjust and Bypass 3. Sensor, Setpoint adjust and Bypass

4. Sensor and Bypass 4. Sensor and Bypass

5. None 5. None

Models Possible Configurations for the W7751H Model

via transducer.

4. Pulse Width Modulating electric valve, or pneumatic via transducer.

5. None

2. Series 60 Modulating electric valve, or pneumatic via transducer.

3. Pulse Width Modulating electric valve, or pneumatic via transducer.

2. Network (DestWndw signal received via the E-Bus).

2. Network (DestOccSensor signal received via the E-Bus).

(continued)

25 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Table 5. Configuration Options Summary For W7751 Controllers (Continued).

Option

Air Temperature Sensor

* If both Reheat and peripheral heat are used in the same application:



Both must be same output type such that both are: staged, floating or PWM



The first and second stage ordering is selectable between stage 1 - reheat, stage 2 peripheral or stage 1- peripheral, stage 2 reheat.

** Only 1 Analog input is configurable on the W7751H and only if the T7770A or D (no Space temperature setpoint) Wall

modules are used.

Possible Configurations for the W7751B,D,F

Models Possible Configurations for the W7751H Model

1. Discharge Air Temperature 1. Discharge Air Temperature**

2. Supply Air Temperature 2. Supply Air Temperature**

3. None 3. None

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Each VAV box that is controlled by a W7751B,D,F,H can have a series fan (see Fig. 22), a parallel fan (see Fig. 23), or no fan (see Fig. 12). The air temperature sensor cannot be used on the W7751H Smart VAV Actuator with wall modules that have a setpoint.

AIR FLOW SENSOR

PRIMARY AIR

DAMPER ACTUATOR

W7751 CONTROLLER

Fig. 12. VAV box (without fan).

Figs. 13 through 21 illustrate the W7751B,D,F,H VAV Controllers that have a box type of (single duct) with DestHvacMode in (the default of Auto).

Refer to Fig. 13 to see VAV box modes for Pressure_Independent or (Pressure_Dependent), Reheat type Float_Reheat/Float_Periph, Non-Proportional.

REHEAT COIL (OPTIONAL)

DISCHARGE AIR

VALVE

T7770

M11824

100 PERCENT OPEN

REHEAT FLOW

Periph Min Pos

REHEAT MODE

HeatOccSpt

COOLING MODE

CoolOccSpt

MAX FLOW (POS)

MIN FLOW (POS)

M11826

Fig. 13. VAV box modes for Reheat Type

Float_Reheat/Float_Periph, Non-Proportional. (suited

for Peripheral heat control because the Peripheral

output closes to a minimum position (Periph Min Pos)

at HeatOccSpt).

Refer to Fig. 14 to see VAV box modes for Pressure_Independent or (Pressure_Dependent), Reheat type Float_Reheat/Float_Periph, Proportional.

Pressure Type:

Pressure Independent or (Pressure_Dependent)

Reheat Type:

Float_Reheat or Float_Periph

Proportional Reheat Flow:

Enable

Pressure Type:

Pressure Independent or (Pressure_Dependent)

Reheat Type:

Float_Reheat or Float_Periph

Proportional Reheat Flow:

Disable

Periph Min Pos:

Greater than 0%

74-2949–1 26

Periph Min Pos:

Equals 0

REHEAT FLOW

MAX (POS)

MIN (POS)

M11827

100 PERCENT OPEN

HeatOccSpt

CoolOccSpt

Periph Min Pos

REHEAT MODE

COOLING MODE

Fig. 14. VAV box modes for Reheat Type

REHEAT FLOW

M11828

100 PERCENT OPEN

HeatOccSpt CoolOccSpt

REHEAT MODE

COOLING MODE

MAX FLOW (POS)

MIN FLOW (POS)

Periph Min Pos

REHEAT FLOW

M11829

STAGE 3 STAGE 2 STAGE 1

HeatOccSpt CoolOccSpt

MAX FLOW (POS)

MIN FLOW (POS)

REHEAT MODE

COOLING MODE

Float_Reheat/Float_Periph, Proportional. (suited for

Reheat control because the Reheat closes to zero

percent at HeatOccSpt).

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

Proportional Reheat Flow:

Enable

Refer to Fig. 15 to see VAV box modes for Pressure_Independent or (Pressure_Dependent),Reheat type Float_Reheat/Float_Periph, Proportional.

Pressure Type:

Pressure Independent or (Pressure_Dependent)

Reheat Type:

Float_Reheat or Float_Periph

Proportional Reheat Flow:

Enable

Periph Min Pos:

Greater than 0%

Fig. 16. VAV box modes for Reheat Type

Elec_ThreeStage - Proportional.

Refer to Fig. 17 to see VAV box modes for Reheat type Elec_ThreeStage - Non-Proportional.

Pressure Type:

Pressure Independent or (Pressure_Dependent)

Reheat Type:

Elec_ThreeStage or (Elec_ThreeStageBin), (Elec_OneStage), (Elec_TwoStage)

Proportional Reheat Flow:

Disable

REHEAT FLOW

REHEAT MODE

COOLING MODE

MAX FLOW (POS)

MIN FLOW (POS)

Fig. 15. VAV box modes for Reheat Type

Float_Reheat/Float_Periph, Proportional. (suited for

Peripheral heat control because the Peripheral output

closes to a minimum position (Periph Min Pos) at

HeatOccSpt).

Refer to Fig. 16 to see VAV box modes for Reheat type Elec_ThreeStage - Proportional.

Pressure Type:

Pressure Independent or (Pressure_Dependent)

Reheat Type:

Elec_ThreeStage or (Elec_ThreeStageBin), (Elec_OneStage), (Elec_TwoStage)

STAGE 3 STAGE 2 STAGE 1

HeatOccSpt CoolOccSpt

Fig. 17. VAV box modes for Reheat Type

Refer to Fig. 18 to see VAV box modes for Reheat type

Elec_ThreeStage - Non-Proportional.

PeriphThenReheat - Proportional.

Pressure Type:

Pressure Independent or (Pressure_Dependent)

Reheat Type:

Float_Periph_Reheat or (PWM_Periph_Reheat)

27 74-2949–1

M11830

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

REHEAT FLOW

MIN FLOW

M11831

PERIPHERAL

HTG

REHEAT

HeatOccSpt CoolOccSpt

100 PERCENT OPEN

REHEAT MODE

COOLING MODE

MAX FLOW (POS)

MIN FLOW (POS)

Periph Min Pos

REHEAT FLOW

MIN FLOW

M11832

PERIPHERAL

HTG

REHEAT

100 PERCENT OPEN

REHEAT MODE

COOLING MODE

HeatOccSpt CoolOccSpt

Periph Min Pos

MAX FLOW (POS)

MIN FLOW (POS)

100 PERCENT OPEN

REHEAT FLOW

MAX FLOW

MIN FLOW

M11825

HeatOccSpt CoolOccSpt

REHEAT MODE

COOLING MODE

Periph Min Pos

Proportional Reheat Flow:

Enable

Periph Min Pos:

0% or greater

Fig. 18. VAV box modes for Reheat type Peripheral

Heating Then Reheat - Proportional

(Float_Periph_Reheat/PWM_Periph_Reheatl).

Refer to Fig. 19 to see VAV box modes for Reheat type ReheatThenPeriph - Proportional.

Reheat Type:

FloatHotDuctPrDep

Proportional Reheat Flow:

Disable

Periph Min Pos:

0% or greater

Fig. 20. VAV box modes for Reheat Type Float_Reheat/Float_Periph, no minimum position, reheat goes to zero percent in cooling mode Non-

proportional (suited for Reheat control because the

Reheat closes to zero percent at HeatOccSpt).

Pressure Type:

Pressure Independent or (Pressure_Dependent)

Reheat Type:

Float_Reheat_Periph or (PWM_Reheat_Periph)

Proportional Reheat Flow:

Enable

Periph Min Pos:

0% or greater

Fig. 19. VAV box modes for Reheat Type Reheat Then

Peripheral Heating Proportional

(Float_Reheat_Periph/PWM_Reheat_Periph).

Refer to Fig. 20 to see VAV box modes for Press_Dependent, Reheat type Float_Reheat/FloatHotDuctPrDep, Non-Proportional.

Refer to Fig. 21 to see VAV box modes for Pressure Dependent, Reheat type Float_Reheat/Float_Periph.

Pressure Type:

Pressure_Dependent

Reheat Type:

Float_Reheat/Float_Periph

Proportional Reheat Flow:

Disable

Periph Min Pos:

0% or greater

100 PERCENT OPEN

REHEAT POS. (DAMPER)

MIN POS.

M11833

Fig. 21. VAV box modes for Pressure Dependent,

REHEAT MODE

HeatOccSpt CoolOccSpt

Reheat Type Float Reheat/Float_Periph.

COOLING MODE

Periph Min Pos

MAX FLOW (POS)

MIN FLOW (POS)

Pressure Type:

Pressure_Dependent

74-2949–1 28

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

A Series fan is intended to run continuously when the main air handler is on and is in-line with the primary air flow through the box. This configuration is sometimes referred to as Variable Volume Supply with Constant Volume Discharge (VVS/CVD).

NOTE: The location of the heating coils can be in the

discharge, as shown in Fig. 22, or in the plenum return.

AIR FLOW SENSOR

PRIMARY AIR

DAMPER ACTUATOR

W7751 CONTROLLER

FAN RELAY

OPEN TO PLENUM

FAN

REHEAT COIL (OPTIONAL)

DISCHARGE AIR

VALVE

M11834

T7770

Fig. 22. Series VAV box fan.

PARALLEL FAN TEMP OPERATION: COOL/REHEAT MODES

OFF

COLD WARM

HeatOccSpt CoolOccSpt

Fig. 24a. Parallel fan temperature operation: for

Cool/Reheat modes.

PARALLEL FAN FLOW OPERATION: COOL/REHEAT MODES

ROOM TEMPERATURE

M11836

A parallel fan, see Fig. 23, is not located in the primary air stream, but is designed to add return air from the plenum into the air stream delivered to the space. The Excel 10 VAV Controller turns on the parallel fan when the space temperature falls below Setpoint as a first stage of reheat (Parallel Temp), or if the air flow falls below a minimum air flow setpoint to maintain a minimum air flow to the space (Parallel Flow).

NOTE: The location of the heating coils can be in the

discharge, as shown in Fig. 23, or as part of the plenum air return, either before or after the fan.

AIR FLOW SENSOR

PRIMARY AIR

W7751 CONTROLLER

DAMPER ACTUATOR

FAN RELAY

FAN

RETURN AIR FROM PLENUM

REHEAT COIL

VALVE

DISCHARGE AIR

T7770

M11835

OFF

FanEnableFlow

SUPPLY FLOW

M11879

Fig. 24b. Parallel fan flow operation: for Cool/Reheat

modes.

Refer to Fig. 25 to see Dual Duct, Pressure Independent, with flow mixing that has cold and hot duct flow pickups.

Fig. 23. Parallel VAV box fan.

See Fig. 24a and 24b to see the Heat/Cool Modes for Parallel Temperature/Flow VAV box fans.

29 74-2949–1

EXCEL 10 W7751B,D,F,H VAVII CONTROLLERS

HOT DUCT SUPPLY AIR

COLD DUCT SUPPLY AIR

FLOW SENSOR

W7751 CONTROLLER MASTER

M11837

W7751 CONTROLLER SATELLITE

DISCHARGE AIR

T7770

SPACE AIR TEMP

Fig. 25. Dual Duct, Pressure Independent, with flow

mixing that has cold and hot duct flow pickups (uses a

satellite Excel 10 for hot duct).

Dual Duct Flow Mixing: (For setup and Calibration refer to the Dual Duct Calibration procedure in Appendix B.)

Master flow configuration:

Master_Flow_Mix

is set to zero. Since during the initial heating load, both the hot and cold duct are supplying air, we have flow mixing.

See Fig. 26 for Heat/Cool Modes for Dual Duct, Pressure Independent, with flow mixing, that has cold and hot duct flow pickups.

COLD DUCT

MAX CLG FLOW SP

MAX HTG FLOW SP

MIN HTG FLOW SP MIN CLG FLOW SP

M11838

HOT DUCT SATELLITE

MIXING ZONE

COLD HOT

HeatOccSpt

(THIS IS THE MIXING ZONE)

MASTER

CoolOccSpt

Fig. 26. Heat/Cool Modes for Dual Duct, Pressure

Independent, with flow mixing, that has cold and hot

duct flow pickups.

See Fig. 27 for Dual Duct, Pressure Independent, without flow mixing, that has cold and hot duct flow pickups.

HOT DUCT SUPPLY AIR

FLOW SENSOR

Master reheat configuration:

DualDuctReheat

Satellite flow configuration:

Satel_Flow_Mix

Satellite reheat configuration:

DualDuctReheat NOTE: SrcMaster from the Master Excel 10 must be

bound to DestSatellite of the Satellite Excel 10 and SrcBoxFlow of the Satellite Excel 10 must be bound to DestFlowTrack of the Master Excel 10 (see Refer Excel 10 Points in Network menu in EVision) in order for this application to function properly.

Dual duct flow mixing uses two control devices, a master (for the cold duct) and a satellite (for the hot duct) to provide pressure independent control. If there is a need for cooling, dual duct flow mixing will control temperature to the cooling setpoint, setting the flow control setpoint for the cold duct between min flow and max flow while setting the hot duct flow setpoint to zero. If the temperature of the space is between the cooling and the heating setpoints, the cold duct will control to the min flow while the hot duct flow is set to zero. If there is a need for heating, the controllers will try to control to the heating setpoint by first modulating the cold duct flow from min flow to zero while simultaneously modulating the hot duct flow from zero to min flow. If there is additional need for heat, the hot duct will modulate from min flow to max flow while the cold duct

DISCHARGE AIR

COLD DUCT SUPPLY AIR

FLOW SENSOR

W7751 CONTROLLER MASTER

M11837

W7751 CONTROLLER SATELLITE

SPACE AIR TEMP

T7770

Fig. 27. Dual Duct, Pressure Independent, without flow

mixing, that has cold and hot duct flow pickups (uses

a satellite Excel 10 for hot duct).

Dual Duct No Flow Mixing: (For setup and Calibration refer to the Dual Duct Calibration procedure in Appendix B.)

Master flow configuration:

Master_No_Flow_Mix

74-2949–1 30

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Honeywell W7751D, W7751H, W7751B, W7751F SYSTEM ENGINEERING

Specifications and Main Features

Frequently Asked Questions

User Manual