Honeywell W7752J, W7754P, W7752G, W7754K, W7752D SYSTEM ENGINEERING

...

Excel 10

W7752D,E,F,G,J AND W7754K,L,M,N,P

FAN COIL UNIT CONTROLLERS

SYSTEM ENGINEERING

CONTENTS

Revision overview ....................................................................................................................................................................... 2

Introduction.................................................................................................................................................................................. 3

Description of Devices.............................................................................................. 3

Products Covered..................................................................................................... 4

Organization of Manual............................................................................................. 4

Applicable Literature................................................................................................. 4

Product Names......................................................................................................... 4

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

Control Provided....................................................................................................... 5

Setpoints.............................................................................................................. 6

Bypass ................................................................................................................. 7

LED/LCD.............................................................................................................. 7

Energy-Saving Features ...................................................................................... 8

Occupancy Status................................................................................................ 8

Safety Features.................................................................................................... 9

Operating Modes ............................................................................................... 10

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

Construction ........................................................................................................... 11

Excel 10 W7752 FCU Controllers...................................................................... 11

Excel 10 W7754 FCU Controllers...................................................................... 11

Controller Performance Specifications .............................................................. 13

Configurations ........................................................................................................ 14

General .............................................................................................................. 14

Fan Type............................................................................................................ 14

Type of Heating and Cooling Equipment ........................................................... 15

Reheat Output.................................................................................................... 16

Digital Input........................................................................................................ 16

Excel 10 Wall Module Options........................................................................... 17

Abbreviations and Definitions ................................................................................. 18

Overview................................................................................................................. 19

Step 1. Plan the System ......................................................................................... 19

Application Steps ...................................................................................................................................................................... 19

Step 2. Determine Other Bus Devices Required .................................................... 19

Step 3. Lay Out Communications and Power Wiring ............................................. 20

ONWORKS Layout.............................................................................................. 20

Power Wiring ..................................................................................................... 22

Step 4. Prepare Wiring Diagrams........................................................................... 22

General Considerations ..................................................................................... 22

Terminal Block Assignment and Wiring Example for the W7752 Controller...... 23

Terminal Block Assignment and Wiring for the W7754 Controller..................... 24

ONWORKS Termination ..................................................................................... 25

Step 5. Order Equipment........................................................................................ 26

Step 6. Configure Controllers ................................................................................. 28

General .............................................................................................................. 28

Output ................................................................................................................ 29

Input................................................................................................................... 30

Equipment Control ............................................................................................. 31

Fan..................................................................................................................... 31

Switching Levels ................................................................................................ 32

Zone Options ..................................................................................................... 32

EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Miscellaneous.....................................................................................................32

PID......................................................................................................................33

Commissioning ...................................................................................................33

ID Number ..........................................................................................................33

Excel 10 FCU Controller Point Mapping.............................................................33

Step 7. Troubleshooting ..........................................................................................35

Troubleshooting Excel 10 FCU Controllers and Wall Modules...........................35

Alarms ................................................................................................................35

Broadcasting the Service Message ....................................................................37

Manual Mode......................................................................................................37

Appendix A. Using E-Vision to Commission a Fan Coil Unit .................................................................................................38

Appendix B. Configuring for Master/Slave Operation.............................................................................................................39

Appendix C. Complete List of Excel 10 FCU Controller User Addresses .............................................................................41

Appendix D. Q7750A Excel 10 Zone Manager Point Estimating Guide.................................................................................82

Temperature Sensor Calibration .............................................................................38

Procedure ...........................................................................................................38

Output Configuration Options..................................................................................39

Input Configuration Options.....................................................................................39

Equipment Control Options .....................................................................................39

Zone Control Options ..............................................................................................39

Network Variable Binding ........................................................................................39

Approximate Memory Size Estimating Procedure...................................................82

REVISION OVERVIEW

On the following pages changes have been made compared to the previous release of this document:

Page: Change:

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EXCEL 10 FAN COIL UNIT CONTROLLER - SYSTEM ENGINEERING

INTRODUCTION

Description of Devices

The W7752D,E,F,G,J and W7754K,L,M,N,P Fan Coil Unit (FCU) Controllers all belong to the Excel 10 family product line. FCU systems control the space temperature in a given room by regulating the heating and/or cooling equipment which control the temperature of the air delivered to that space and the fan which controls air flow. Reheat coils are often included at the fan coil unit. Excel 10 FCU controllers are capable of stand-alone operation; however, optimum functional benefits are achieved when the network communication capabilities are used.

Excel 500

The zone controlled by the Excel 10 FCU controllers will typically use an Excel 10 wall module with a temperature sensor for space temperature measurement, analog setpoint input, bypass push-button, and occupancy/unoccupancy override. See page 4 for form numbers of Excel 10 wall module literature for further information.

The Excel 500 can assume all of the Excel 10 FCU controllers' scheduling functions. The number of Excel 10 FCU controllers on the L

ONWORKS network is determined by

the rules of LonWorks network design (see Table 10). Frontends can be either EBNI, SymmetriE, or SynOpsys, depending upon the size and complexity of the connected system.

PCLTA10

PCC10

Excel 10 W7754

FCU Controller

LonWorks network

ONUNUSED

UNUSED

W7754Kxxxx

0345

WALL MOD.

USED

+ -

RS1A

23D25

LON

Honeywell

DI2 USED

230 Vac, 50/60 Hz

D-71101 Schönaich

max. 5 VA unloaded

Made in Ger man y

GND9LED10FAN11DI2

triac

2 A10A

0.5 A

321

4 5 6

23247

1314

15 181716

1920

2122

2526

2A/M

IIIII I

DI1

SET

SENS

534

T7460 / T7560

com

open

GND

230 V

fan

OUT1OUT2

230 V

230 Vac

Excel 10 W7752

FCU Controller

Excel 10

wall module

Fig. 1. Typical EXCEL 5000® System overview

Excel 10

wall module

3 EN0B-0377GE51 R0703

EXCEL 10 FAN COIL UNIT CONTROLLER - SYSTEM ENGINEERING

Products Covered

This System Engineering Guide describes how to apply the Excel 10 FCU controller and the accessories to typical FCU applications. The specific devices covered include:

• W7752D,E,F,G, and J FCU Controllers.

• W7754K,L,M,N, and P FCU Controllers.

• T7460 Wall Modules.

• T7560 Wall Modules.

• for further products, see Appendices.

Organization of Manual

The Introduction and Application Steps 1 through 5 provide the information needed to make accurate ordering decisions. Application Step 6 and the Appendices include configuration engineering that can be started using E-Vision software after the devices and accessories are ordered. Application Step 7 is troubleshooting. Information provided in support of the use of third-party L

ONWORKS communication packages to con-

figure FCU Controllers is found in the Appendices.

The organization of the manual assumes a project is being engineered from start to finish. If you are adding to or changing an existing system, the Table of Contents can guide you to the relevant information.

Applicable Literature

The following is a list of documents containing information related to the Excel 10 FCU Controller and the EXCEL 5000 System in general.

Form No. Title

EN0B-0376GE51 Excel 10 W7752D,E,F,G,J FCU

Controller Specification Data

EN1B-0250GE51 Excel 10 W7752D,E,F,G,J FCU

Controller Installation Instructions

EN1B-0251GE51 Excel 10 W7754K,L,M,N,P FCU

Controller Installation Instructions

74-3083 Excel 10 T7460 Wall Modules

Specification Data

95-7610 Excel 10 T7460 Wall Modules

Installation Instructions

74-3097 Excel 10 T7560 Wall Modules

Specification Data

95-7620 Excel 10 T7560 Wall Modules

Installation Instructions

74-2950 Excel 10 Q7750A, Excel 10 Zone

Manager Specification Data

95-7509 Excel 10 Q7750A Zone Manager

Installation Instructions.

95-7554 Excel 10 FTT/LPT 209541B

Termination Module Installation Instructions

95-7510 Excel 10 Q7751A Router Installation

Instructions (US only)

95-7511 Excel 10 Q7752A Serial Interface

Installation Instructions (US only) 74-2588 Excel E-Vision User Guide 74-5587 Excel CARE User Guide 74-2039 XBS User’s Manual 74-5018 XBS Application Guide

Product Names

The W7752 Controller is available in five models:

• W7752D FCU Controller with 230 Vac power input and

with reheat relay.

• W7752E FCU Controller with 230 Vac power input without

reheat relay.

• W7752F FCU Controller with 115 Vac power input with

reheat relay.

• W7752G FCU Controller with 115 Vac power input without

reheat relay.

• W7752J FCU Controller with 100 Vac power input without

reheat relay.

The W7754 Controller is available in five models:

• W7754K FCU Controller with 230 Vac power supply, one

triac output, and one digital output for the low-voltage Pulse-Width Modulated (PWM) control of a solid-state relay employed in high-current electric reheat applications

• W7754L FCU Controller with 24 Vac power supply and

two triac outputs

• W7754M FCU Controller with 230 Vac power supply

• W7754N FCU Controller with 230 Vac power supply and

two triac outputs

• W7754P FCU Controller with 230 Vac power supply, four

triac outputs, and an extra, fourth relay

The 2000-series FCU controllers can use any of the following Excel 10 wall modules:

• T7460A with temperature sensor.

• T7460B with temperature sensor and setpoint adjustment.

• T7460C with temperature sensor, setpoint adjustment,

and bypass button and LED.

• T7460D with temperature sensor, setpoint adjustment and

5-position fan switch.

• T7460E with temperature sensor, setpoint adjustment,

bypass button and LED, and 3-position fan switch.

• T7460F with temperature sensor, setpoint adjustment,

bypass button and LED, and 5-position fan switch.

• T7560A with temperature sensor, unit enable button,

setpoint adjustment, bypass button, LCD display and configurable fan override with up to five settings.

Other products:

• Q7750A Excel 10 Zone Manager.

• Q7751A Bus Router (US, only).

• Q7752A Serial Adapter (US, only).

• AK3781 L

ONWORKS (non-plenum): 22 AW G (0.325 mm

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

• AK3782 L

ONWORKS (non-plenum): 22 AW G (0.325 mm

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

• AK3791 L

ONWORKS (plenum): 22 AW G (0.325 mm

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

• AK3792 L

ONWORKS (plenum): 22 AW G (0.325 mm

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

• C7608A Return Air Sensor (Europe, only). Refer to the Table 15 (see section "Step 5. Order Equipment") for complete listing of all available part numbers.

Control Application

FCU systems in commercial buildings control room temperature through the control of heat and/or cold water valves and fan speed. Electric reheat coils may also be used in the system. The FCU Controller is located in the fan coil unit and is typically connected to an Excel 10 wall module which incorporates a temperature sensor, setpoint and fan

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

speed controls, and a bypass or override button. Fig. 2 shows a typical FCU control application.

Excel 10 W7754

FCU Controller

ONUNUSED

UNUSED

W7754Kxxxx

DI2 USED

GND9LED10FAN11DI2

321 4 5 6 23247

DI1

Honeywell

0345

230 Vac, 50/60 Hz

D-71101 Schönaich

max. 5 VA unloaded

Made in Germany

triac

2 A10A

0.5 A

131415 181716

192021 22

2526

2A/M

III II I

com

open

SET

GND

230 V

fan

SENS

5342 1

OUT1OUT2

230 V

T7460 / T7560

230 Vac

WALL MOD.

USED

+ -

RS1A

23D25

LON

wall

contact

Excel 10

wall module

LonWorks network

Fig. 2. Typical Excel 10 FCU control application

Control Provided

The Excel 10 FCU controllers provide room temperature control for two- and four-pipe fan coil units with optional electric heating coil. The basic control sequence is shown in Fig. 3. As space temperature falls below the heating setpoint, the heating output is increased. As space temperature increases above the cooling setpoint, the cooling output is modulated to 100%. Switching levels for staged heating/cooling and fan speeds are configurable. The fan may still be configured to run continuously during the zero energy band in the occupied mode. Additional configurable fan control features include fan min. ON and OFF times, run-up times, and overrun times.

The Excel 10 FCU controllers use a PID control algorithm with which each of the three parameters can be configured. There are additional configurable boost parameters (HeatBoost and CoolBoost) which specify a range outside of which the heating or cooling outputs are turned on fully for faster response (for thermal actuators this specifies the control hysteresis). The controllers are delivered with factory defaults for each of the parameters.

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Fig. 3. Control sequence diagram

Setpoints

Setpoint Knob

The Excel 10 FCU controllers may be connected to an Excel 10 wall module equipped with a setpoint knob. When configured (UseWallModSpt), the value from the setpoint knob is used to calculate the "occupied" setpoint for the heating and the cooling modes. There are two options (SptKnob) which determine how the setpoint used by the control algorithm is calculated: "relative" (or "offset") and "absolute middle". When configured for "relative", the Excel 10 wall module setpoint knob represents a number from

-9...+9 DDF(-5...+5 K) which is added to the configured "occupied" and "standby" setpoints for the heating and the cooling modes (SptCoolOcc and SptHeatOcc). When SptKnob is set to "absolute middle", the setpoint knob becomes the mid-point of the Zero Energy Band (ZEB) extending between the "occupied" or "standby" setpoints for the heating and the cooling modes. The range of the ZEB is found by taking the difference between the "occupied" or "standby" setpoints configured for the heating and the cooling modes; in the case of "absolute middle", the current "occupied" and "standby" setpoints are therefore found as follows:

"occupied" setpoint:

SrcRmTempSptEff (in cooling mode) =

SrcRmTempSptHw + (SptCoolOcc - SptHeatOcc) / 2

SrcRmTempSptEff (in heating mode) =

SrcRmTempSptHw - (SptCoolOcc - SptHeatOcc) / 2

"standby" setpoints:

SrcRmTempSptEff (in cooling mode) =

SrcRmTempSptHw + (SptCoolStby - SptHeatStby) / 2

SrcRmTempSptEff (in heating mode) =

SrcRmTempSptHw - (SptCoolStby - SptHeatStby) / 2

SptKnobLowLim and SptKnobHiLim. In the case of absolute "occupied" and "standby" setpoints, the setpoint knob still represents the mid-point of the ZEB, even when set to either of these limits. The actual setpoints are given by the equations shown above. When the setpoint knob is configured to be "relative", the lowest actual "occupied" setpoint allowed is equal to SptHeatOcc - SptKnobLowLim, and the highest allowed is equal to SptCoolOcc + SptKnobHiLim. The lowest and highest "standby" setpoints are found in an analogous way.

Setpoint from Network

When not configured for UseWallModSpt, DestRmTempSpt must be bound to another node that provides a setpoint. When bound and when a valid update is received, DestRmTempSpt is used with the appropriate ZEB:

ZEBoccupied = SptCoolOcc - SptHeatOcc ZEBstandby = SptCoolStby - SptHeatStby

The "unoccupied" setpoint does not depend on DestRmTempSpt at all.

Setpoint Offset

Third-party nodes may be bound to DestSptOffset in order to shift the setpoint in the range of -18...+18 DDF (-10...+10 K).

When in the "unoccupied" mode, the remote setpoint knob is ignored, and the configured setpoints for those modes are used instead.

Setpoint Limits

Setpoints are limited to the range of 50...95°F (10...35°C). The value of the setpoint knob (SrcRmTempSptHw) is limited to the range provided by the configuration parameters

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Table 1. Example setpoint values based upon default configuration – "absolute middle" setpoint knob (°C)

occupancy

mode

"occupied" 23 21 2 21 22 20

"standby" 25 19 6 21 24 18

"unoccupied" 28 16 12 X 28 16

NOTES:

1. Sample value shown. Limited by default configuration settings to the range of 12...30°C.

2. Limited to the range of 10...35°C.

3. = setpoint knob + (ZEB/2)

4. = setpoint knob – (ZEB/2)

Table 2. Example setpoint values based upon default configuration - Relative setpoint knob (°C)

occupancy

mode

"occupied" 23 21 2 -2 21 19

"standby" 25 19 6 -2 23 17

"unoccupied" 28 16 12 X 28 16

NOTES:

1. Sample value shown. Limited by default configuration settings to the range of -5...+5°C.

2. Limited to the range of 10...35°C.

3. = configured cooling setpoint + setpoint knob

4. = configured heating setpoint + setpoint knob

Bypass

Bypass Mode

During periods scheduled as being unoccupied, the Excel 10 wall module's bypass push-button may be used to force the

FCU controller into the "occupied" mode. The FCU controller

can also be forced into the "occupied" mode by means of a

ONWORKS network command (DestManOcc set to

L OC_BYPASS). The controller will then remain in "bypass" mode until:

1. The bypass timer has timed out, or

2. The user again presses the Excel 10 wall module's bypass push-button, thus cancelling the "bypass" mode, or

3. The occupancy schedule (DestSchedOcc network input) switches the mode to "occupied".

4. The network input DestManOcc is set to OC_NUL.

The Excel 10 wall module indicates the current bypass mode status (see Excel 10 wall module literature for further information).

Bypass Timer

When the "bypass" mode has been activated, the bypass timer is set to BypTime (default of 180 minutes), at the end of which the mode will revert to its original state (see Excel 10 wall module literature for further information).

Continuous Unoccupied Mode

The "continuous unoccupied" mode is entered when an Excel 10 wall module is configured to allow it and if :

• (in the case of the T7460) the bypass button is pressed for

four to seven seconds (until the LED blinks),

• (in the case of the T7560) the bypass button is pressed for

more than five seconds (until the flashing moon appears).

configured

cooling setpoint

configured

cooling setpoint

configured

heating setpoint

configured

heating setpoint

ZEB

setpoint

knob

setpoint

knob

effective cooling

setpoint

2,3

effective heating

setpoint

effective heating

setpoint

The FCU controller can also be forced into the "continuous unoccupied" mode by means of a L

ONWORKS network

command (DestManOcc set to OC_UNOCCUPIED). The

FCU controller will then remain in this mode indefinitely, or

until the bypass button is pressed to exit the mode or a network command is sent to clear the mode.

Bypass Push-Button

The FCU Controller may be connected to an Excel 10 wall module equipped with a bypass push-button. There are three ways to configure the bypass push-button (see Table 17 for further information):

NONE BYPASS_UNOCCUPIED BYPASS_ONLY

Override Priority

The FCU Controller can be configured to arbitrate overrides coming from the bypass push-button and the L

ONWORKS

network. There are two possible states which have the following meanings:

LAST_WINS specifies that the last command received

from either the wall module or DestManOcc determines the effective override state.

NETWORK_WINS specifies that when DestManOcc is not

OC_NUL, then the effective occupancy mode is determined by DestManOcc regardless of the wall module override state.

LED/LCD

LED Override

The wall module’s LED indicates that the FCU controller is being overridden by either the bypass button or the

ONWORKS network.

• LED ON "override bypass"

2,4

7 EN0B-0377GE51 R0703

EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

• One flash per second "override unoccupied"

• Two flashes per second "override standby" or

"occupied"

• LED OFF no override

• Four flashes per second The controller is responding

ONWORKS network management wink command.

to a L

LED Occupancy

The wall module’s LED indicates the effective occupancy mode.

• LED ON effective "occupied" or effective "bypass"

• One flash per second effective "standby"

• LED OFF effective "unoccupied"

• Four flashes per second The controller is responding

ONWORKS network management wink command.

to a L

LCD Display

This mode is used only for T7560 Wall Modules. The occupancy mode is represented by the following symbols:

effective "occupied" or effective "bypass"

effective "standby"

effective "unoccupied"

Controller is OFF

and Controller is OFF, frost protection is enabled.

Flashing symbols indicate the "override" mode:

override "occupied" or override "bypass"

override "standby"

override "unoccupied"

The controller is responding to a LONWORKS network

management wink command.

Energy-Saving Features

The "Standby" Mode

The digital input for reading input from an occupancy sensor (usually a motion detector) provides the FCU controller with a means to enter an energy-saving standby mode whenever there are no people in the room. The "standby" mode occurs when the scheduled occupancy mode is "occupied" but the occupancy sensor indicates that the room is nevertheless currently unoccupied. If no occupancy sensor is directly connected to the FCU controller, an occupancy sensor from another node may be bound to the network input DestOccSensor. The FCU controller can also be forced into the "standby" mode by means of a L command (DestManOcc set to OC_STANDBY). When in the "standby" mode, the FCU Controller uses the "standby" setpoints configured for the heating and the cooling modes (SptHeatStby or SptCoolStby).

ONWORKS network

used by binding it to DestWindow. Frost protection remains active. Normal temperature control resumes when the window closes.

Demand Limit Control

When a high-electrical-demand signal is received from an energy management system via the L

ONWORKS network

(DestDlcShed), the FCU controller uses DlcStptBump to shift the current setpoint (down for heating and up for cooling) by the configured value to save energy.

Fig. 4. Optimum start (heating)

Optimum Start Gradients

There are two parameters, RecRampCool and RecRampHeat, that can be configured to cause the cooling and heating setpoints respectively to ramp up to their occupied settings from their unoccupied or standby settings

prior to scheduled occupancy. The FCU controller uses the configured rates to determine the optimum

time to start increasing the heating or cooling demand. See the following figures. The configuration parameters are in K/hour.

Fig. 5. Optimum start (cooling)

Window Sensor

The digital input for reading input from a window contact provides the FCU controller with a means to disable its temperature control activities if someone has opened a window or door in the room. If no window sensor is directly connected to the FCU controller, the sensor from another node may be

EN0B-0377GE51 R0703 8

Occupancy Status

The occupancy status is determined based upon Table 3. Manual override may come from the network input DestManOcc or from the bypass push-button.

EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Table 3. Effective Occupancy Mode Arbitration

scheduled occupancy mode occupancy sensor status manual override status effective operating mode

"occupied" room occupied not assigned OC_OCCUPIED "occupied" room not occupied not assigned OC_STANDBY X X "occupied" OC_OCCUPIED X X "unoccupied" OC_UNOCCUPIED X X "standby" OC_STANDBY "occupied" X "standby" OC_OCCUPIED "standby" X not assigned OC_STANDBY "standby" X "standby" OC_OCCUPIED "unoccupied" X not assigned OC_UNOCCUPIED "unoccupied" X "standby" OC_BYPASS X=Don't care

Safety Features

Frost Protection

If the room temperature falls below 46.4°F (8°C), the FCU controller enables the heating circuit to ensure frost protection and an alarm is issued. When the temperature rises above 48.2°F (9°C) again, the heating circuit is turned OFF again.

Smoke Control

The FCU controller will respond to L emergency commands by switching OFF heating/cooling outputs and switching OFF the fan (depressurize) or switching ON the fan at its highest speed (pressurize). An alarm is issued for any emergency commands

ONWORKS network

Fan Failure Protection

When configured with an airflow detector, the FCU controller protects equipment by switching OFF heating / cooling outputs and issuing an alarm when the fan fails.

Fan Interlocks

The FCU controller can be configured such that heating and/or cooling outputs are never ON unless the fan is running. A fan run-up time can be configured to turn ON the fan prior to the heating/cooling outputs being switched ON, and a fan overrun time can be configured to keep the fan running for a period of time after the heating/cooling outputs are switched OFF.

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Operating Modes

The possible modes of operation are listed in Table 4.

Table 4. Modes of Operation for Excel 10 FCU Controller

mode description events causing a controller to switch to this mode

operational modes (user address: SrcFcuModeS)

START-UP AND WAIT

FLOATING OUTPUTS SYNCH

COOLING The FCU controller is controlling in

HEATING The FCU controller is controlling in

MANUAL MODE The control algorithms stay active

FACTORY TEST Control algorithm is disabled; a

DISABLED Control algorithms are terminated,

PRESSURIZE Heating/cooling outputs are switched

DEPRESSURIZE Heating, cooling and fan outputs are

Control algorithms are disabled. Outputs stay in their initial positions. Physical inputs are periodically read and digital filtering of analog inputs is turned OFF to speed up settling time. Input NVs are received and output NVs are sent periodically.

The FCU controller drives the floating control valves to their initial positions and then transitions to one of the control modes.

the cooling mode.

the heating mode.

and outputs are controlled automatically until set individually to test positions using the network input nviTest.

special factory test program runs.

outputs are turned OFF (turn-OFF sequences and interlocks are active). Frost protection is disabled.

OFF, and the fan is switched ON at its highest speed.

switched OFF.

This is the first mode after an application restart.

When the effective occupancy changes to "unoccupied" or "standby", after start-up, after 24 hours since the last positioning, or after each positioning to 0%, the FCU controller transitions to this mode.

Input NV (DestHvacMode) has a value of HVAC_COOL or HVAC_AUTO and the space temperature is above the cooling setpoint.

Input NV (DestHvacMode) has the value of HVAC_HEAT or HVAC_AUTO and the space temperature is below the heating setpoint.

Input NV (DestManMode) has value of MODE_MANUAL.

This mode is for factory testing, only.

Input NV (DestManMode) has a value of MODE_DISABLED.

Input NV (DestEmerg) containing smoke control signal from C-

Bus has the value of EMERG_PRESSURIZE.

Input NV (DestEmerg) containing smoke control signal from C-

Bus has the value of EMERG_DEPRESSURIZE.

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Agency Listings

Table 5 provides information on agency listings for Excel 10 FCU Controller products.

Table 5. Agency listings

device agency comments W7752D to J FCU Controller

W7752D to J FCU Controller W7752D to G FCU Controller W7752D to G FCU Controller

W7754K FCU Controller ??? ??? W7754L FCU Controller ??? ??? W7754M FCU Controller ??? ??? W7754N FCU Controller ??? ??? W7754P FCU Controller ??? ???

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).

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.

UL Tested and listed under UL 916 (file number E87744).

Ambient Temperature Rating: 32...122 °F (0...50 °C).

cUL Tested and listed under UL 916 (file number E87744).

Ambient Temperature Rating: 32...122 °F (0...50 °C).

Construction

Excel 10 W7752 FCU Controllers

The Excel 10 W7752 FCU Controller is available in five basic models, each with two different possibilities for L transceivers. All of these controllers are mains-powered, and two models are equipped with an additional high-power relay for applications with electric reheat. Table 6 shows the differences between models.

Table 6. Excel 10 W7752 FCU Controller models

OS number Power input Reheat relay

W7752D2007 230 Vac X

W7752E2004 230 Vac W7752F2002 115 Vac X

W7752G2000 115 Vac

W7752J2003 100 Vac

All wiring connections to the controllers are made at screw terminal blocks accessible beneath a plastic safety cover. Mounting dimensions are shown in Fig. 6.

ONWORKS

Excel 10 W7754 FCU Controllers

The Excel 10 W7754 FCU Controller is available in five basic models, each with two different possibilities for L transceivers. Table 7 shows the differences between models.

Table 7. Excel 10 W7754 FCU Controller models

OS number Power input Reheat relay

W7754K1001 230 Vac X W7754L1009 24 Vac

W7754M1007 230 Vac

W7754N1004 230 Vac W7754P1000 230 Vac

ONWORKS

CAUTION

If FCU Controllers are mounted vertically and thermal actuators are used, the transformer must not be located below the electronics due to heating effects.

WARNING

Electrical Shock Hazard.

Mains power at terminal block can cause personal injury or death. FCU Controllers must be mounted inside their fan coil unit boxes to prevent access by unauthorized personnel.

To reduce the risk of fire or electric shock, install in a controlled environment relatively free of contaminants.

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Fig. 6. W7752 construction in inches (mm)

WALL MOD.

+ -

RS1A

59.5180

ONUNUSED

UNUSED DI2

USED

GND9LED10FAN11DI2

321 4 5 6 23247

DI1

SET

5342 1

T7460 / T7560

SENS

23D25

LON

GND

0345

230 V

W7754Kxxxx

230 Vac, 50/60 Hz max. 5 VA unloaded

1314 15 181716

L N

2 A10A

III II I

Honeywell

D-71101 Schönaich Made in Germany

triac

0.5 A

1920 2122

fan

OUT1 OUT2

230 Vac

2526

2A/M

com

open

230 V

Fig. 7. "7754 dimensions (in mm)

130

110

terminal protection

cover (optional)

EN0B-0377GE51 R0703 12

EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Controller Performance Specifications

Power: W7752D and W7752E; W7754K,M,N,P

230 Vac +10%, -15%, 50/60 Hz.

W7752F and W7752G

115 Vac +10%, -15%, 50/60 Hz.

W7752J

100 Vac ±6%, 50/60 Hz.

W7754L

24 Vac ±20%, 50/60 Hz.

Operating Temperature:

32...122°F (0...50°C).

Shipping/Storage Temperature:

-40...+158°F (-40...+70°C).

Relative Humidity:

5% to 95% non-condensing

Inputs:

Temperature Sensor:

20k ohm NTC

Setpoint Potentiometer:

10k ohm

Digital Input:

Closed ≤ 400 ohms Open ≥ 10 K ohms

Outputs:

Triac voltage range:

24 Vac ± 20%.

Triac max. current ratings:

250 mA continuous 650 mA surge for 30 sec.

IMPORTANT:

When any device is energized by a Triac, the device must be able to sink a minimum of 15 mA. If nonHoneywell motors, actuators, or transducers are to be used with Excel 10 FCU Controllers, compatibility must be verified.

nviSpaceTemp

nv1

SNVT_temp_p

nviSetPoint

nv2

SNVT_temp_p

nviFanSpeedCmd

nv6

SNVT_switch

nviOccCmd

nv7

SNVT_occupancy

nviApplicMode

nv8

SNVT_hvac_mode

nviSetPtOffset

nv9

SNVT_temp_p

nviWaterTemp

nv10

SNVT_temp_p

nviDischAirTemp

nv17

SNVT_temp_p

nviEnergyHoldOff

nv18

SNVT_switch

Hardware Output

Fan Coil Unit Controller Object #8020

nvoHeatOutput

nv3

SNVT_lev_percent

Mandatory Network Variabl es

Optional Network Variabl es

nvoCoolOutput

nv4

SNVT_lev_percent

nvoFanSpeed

nv5

SNVT_switch

nvoTerminalLoad

nv11

SNVT_lev_percent

nvoLoadAbs

nv12

SNVT_power

nvoDischAirTemp

nv13

SNVT_temp_p

nvoReheat

nv14

SNVT_switch

nvoSpaceTemp

nv15

SNVT_temp_p

nvoEffectSetPt

nv16

SNVT_temp_p

nvoEffectOcc

nv19

SNVT_occupancy

nvoEnergyHoldOff

nv20

SNVT_switch

nvoUnitStatus

nv21

SNVT_hvac_status

Configuration Properties

nc49 - nciSndHrtBt SNVT_time_sec mandatory nc52 - nciMinOutTm SNVT_time_sec optional nc48 - nciRcvHrtBt SNVT_time_sec optional nc17 - nciLocation SNVT_str_asc optional nc60 - nciSetPnts nc59 - nciNumValve

SNVT_temp_setpt SNVT_count

mandatory optional

Fan relays voltage range:

20 to 253 Vac

Fan relays max. current rating:

3 A

Electric reheat relay voltage range:

20 to 253 Vac

Electric reheat relay max. current rating:

10 A 6 A (UL916)

Interoperability

The W7752 Controllers use the LonTalk protocol. They support the L

ONMARK Functional Profile # 8020 “Fan Coil Unit

Controller”, version 2.0. Fig. 8 shows the implementation used.

nviSensorOcc SNVT_Occupancy

Manufacturer

Defined

nvoSensorOcc SNVT_occupancy

Section

nviEmerg SNVT_hvac_emerg

nviReheatRelay SNVT_switch

nvoDigitInState SNVT_switch

Hardware

Input

NOT SUPPORTED.

Fig. 8. LONMARK FCU object profile

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Configurations

General

The following sections provide an overview of the Excel 10 FCU Controller options related to inputs and outputs. See section "Step 6. Configure Controllers" (page 28) for a complete list of configuration options and defaults.

Table 8. Hardware options summary

option possible configurations

fan type no fan

fan interlock enabled

FCU system type two-pipe

output 1 actuator type floating

output 2 actuator type floating

valve direction direct

reheat none

digital input not used

wall module option local

temperature sensor type

NOTE:

The floating-mid option is only for changeover applications and uses only one of the two outputs.

one-speed two-speed three-speed

disabled

four-pipe

floating mid (one for heat/cool) one-stage two-stage three-stage PWM thermal

reverse

reheat (W7752D and F only) free use (W7752D and F only)

W7754?

window closed occupied sensor air flow detector cool changeover window open unoccupied sensor no air flow heat changeover movement no movement

shared

none NTC non-linearized

Fan Type

Each fan coil unit controlled by an FCU controller can have a fan with up to three different speeds or no fan at all. Multispeed fans are switched at the same switching levels as multi-staged heating control points (see Fig. 9). For example, a three-speed fan will switch ON its first speed at the same control level as the first stage of heating or cooling up until the second stage of heating or cooling where the second fan speed will switch ON. A two-stage fan will switch with the first two stages of a 3-stage heating or cooling system. Likewise, a single-speed fan will turn ON at the first stage of any multistaged system. Conversely, a multi-speed fan may follow multiple switching levels even for single-staged, floating, PWM, or thermal actuator-based systems.

Hysteresis

The hysteresis for fan speed extends to the next lower switching level (or a control level of 0) as is shown in Fig. 9. For example, the second fan speed will remain ON until the control level falls below the switching point for the first fan speed. Min. ON and OFF times can be configured and will apply to all fan switching points.

Interlock

A fan interlock can be configured which prevents heating or cooling outputs from being turned ON in the event of a fan failure (where an air flow detector is installed to detect fan failure). When fan interlock is configured, run-up and overrun times can be configured to delay switching ON the heating or cooling equipment after switching ON the fan and delay switching OFF the fan after the heating or cooling equipment is switched OFF.

The fan can be configured to run continuously during the zero energy band during occupied periods.

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Fig. 9. Three-speed fan switching and hysteresis, cooling mode (defaults for switching levels shown)

Type of Heating and Cooling Equipment

The FCU controller can operate with either two-pipe or fourpipe systems. A two-pipe system requires a changeover input to the controller (hardware or network input).

The FCU controller can operate with a variety of actuators for heating and cooling equipment. Floating actuators can be used which will require specifying the valve run time during configuration of the controller. Valve action can be configured as either direct or reverse. When in a two-pipe system with a changeover input, a floating actuator can be used which has the middle position (50%) as the zero energy position. The cool range is then 0 to 50% and the heat range 50 to 100%. The output must be configured as floating-mid.

Multi-stage systems can be controlled with up to three different stages of heating/cooling control. Switching levels are specified in % of control level (see Fig. 10) as is a hysteresis setting which applies to all switching levels. Heating and cooling switching levels and hysteresis are specified separately. Min. OFF times can be configured, and for one-, two- and three-stage systems, a min. ON time can also be configured.

PWM electronic valves and thermal actuators can also be connected and can be configured as either direct or reverse action. The cycle time must be specified during configuration. In the case of PWM valves, the zero and full positions must also be configured.

Fig. 10. Three-stage heating/cooling switching (defaults for switching levels and hysteresis shown)

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Reheat Output

W7752D and F Controllers have an additional high-current of 10 A max. (UL916: 6 A max.) output relay to control an electric reheater (refer to Fig. 2 for sample application). The reheat output has its own switching level and hysteresis settings (see Fig. 11). The reheat relay may also be used as an auxiliary output for other purposes, in which case the W7752 must be configured to specify that the output is under the control of the L control algorithm.

Fig. 11. Reheat switching and hysteresis (defaults

ONWORKS network, and not of the FCU

shown)

Digital Input

There is a single digital input in the W7752 Controller which may be configured to accommodate an occupancy sensor, a window open/closed contact, an air flow detector (for fan failure detection), or a changeover input. It is possible to configure this input for either normally-open or normallyclosed contacts for any of the switches.

The control algorithm in the Excel 10 FCU controller uses the occupancy sensor, if configured, to determine the effective occupancy mode (see Table 3). If the Time Of Day (TOD)

schedule indicates an occupied state, and the eccupancy sensor contact is closed, the effective occupancy mode will be "occupied". However, if the TOD schedule indicates an occupied state and the occupancy sensor contact is open, then the effective occupancy mode will be "standby". The control algorithm will then control according to the "standby" setpoints configured for the heating and the cooling modes.

Configuring the digital input for movement or no movement (dependent upon normally-open or normally-closed contacts) adds a delay of 15 minutes to the occupancy sensor such that the space is considered occupied until 15 minutes has elapsed since the last movement is detected.

If the digital input is configured to read input from a window open/closed contact, heating, cooling, and fan control will be disabled while the window is detected open. Frost protection will be enabled. A set of contacts may be wired in series for multiple windows. If the window open/closed contact is not configured, a one-to-one association (binding) of the window sensor from another controller on the L can be made. A locally-wired contact can also be used in combination with the network input, the result being a logical OR of the inputs.

If the digital input is configured to read input from an air flow detector (fan status), heating and cooling control will be disabled for a fan failure (fan ON and no air flow detected).

The input may also be configured for changeover for a twopipe system.

NOTE: The Excel 10 FCU Controller has limited power

available (only 1.5 mA/4.8 V) for checking the digital input for contact closures. Ensure that contacts used remain within the specified resistance tolerance range (closed ≤ 400 ohms) even when aged.

ONWORKS network

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Excel 10 Wall Module Options

A typical FCU installation will include an Excel 10 wall module containing a 20k ohm NTC room temperature sensor and additional features depending on the wall module type (see Excel 10 wall module literature for further information).

The FCU controller can use a return air sensor rather than the sensor in the wall module if it is wired to the wall module sensor input. Setpoint adjustments can be configured as relative or absolute, and upper and lower limits can be set. A configuration option for the fan speed switch allows it to be disabled if not required. The bypass button can be configured to override the control mode to "occupied" for a configurable bypass time and to override the control mode to "unoccupied" for an indefinite time, or it may be configured to only override to "occupied". The button may also be used to cancel the override.

Common Temperature Control (Master/Slave Controllers)

When one or more FCU controllers serve a common area and a single temperature sensor is to be used, a master/slave arrangement can be configured. One Excel 10 FCU Controller is configured for the local wall module with the desired options. The other Excel 10 FCU Controller(s) will be configured without wall modules and with certain network variables bound with the master controller. Refer to Application Step 6 of this document for more details.

IMPORTANT

The slave units must have the same HVAC equipment connected to it as the master units.

The slave units will not use any internal temperature setpoints or control algorithms. The master controller determines heating/cooling output based upon setpoints and occupancy and L

ONWORKS network command

mode status and communicates this to the slave via the

ONWORKS network.

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Abbreviations and Definitions

CARE Computer Aided Regulation Engineering;

C-Bus Honeywell proprietary Control Bus for

CPU Central Processing Unit; an EXCEL 5000

Echelon

EMS Energy Management System; refers to the

EEPROM Electrically Erasable Programmable Read

EPROM Erasable Programmable Read Only

E-Vision PC-based tool used for configuration and

Excel 10 Zone Manager - A controller that is used to

Firmware Software stored in a nonvolatile memory

the PC based tool used to configure C-Bus- Bus devices.

communications between EXCEL 5000 System controllers and components.

System controller module.

The company that developed the

ONWORKS

network and the Neuron

chips used to communicate on it.

EMI Electromagnetic Interference; electrical

noise that can cause problems with communications signals.

controllers and algorithms responsible for calculating optimum operational parameters for max. energy savings in the building.

Only Memory; the variable storage area for saving user setpoint values and factory calibration information.

Memory; the firmware that contains the control algorithms for the Excel 10 FCU Controller.

commissioning of Excel 10 devices.

interface between the C-Bus and the

ONWORKS network. The Excel 10 Zone

Manager also has the functionality of an Excel 100 Controller, but has no physical I/O points. (Note: The Q7750A Zone Manager may be referred to as E-Link.)

medium such as an EPROM.

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 Ohms Law: V = I x R.

K Kelvin.

LiveCARE The PC based tool used to monitor and

ONWORKS Echelon® LONWORKS® network for

change parameters in C-Bus devices.

communication among Excel 10 FCU controllers.

NEC National Electrical Code; the body of

standards for safe field-wiring practices.

NEMA National Electrical Manufacturers

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

NV Network Variable; an Excel 10 FCU

controller parameter that can be viewed or modified over the L

ONWORKS network.

OEM Original Equipment Manufacturer; the

company that builds the fan coil units.

PC Personal Computer.

Pot Potentiometer. A variable resistance

electronic component located on Excel 10 wall modules. Used to allow user-adjusted Setpoints to be inputted into the Excel 10 FCU Controller.

segment A L

ONWORKS section containing no more

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

Subnet An L

ONWORKS 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.

VA Volt Amperes; a measure of electrical

power output or consumption as applicable to an ac device.

Vac Voltage alternating current; ac voltage as

opposed to dc voltage.

XBS Excel Building Supervisor; a PC based tool

for monitoring and changing parameters in

C-Bus devices.

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

APPLICATION STEPS

Overview

Steps one through seven, see Table 9, address considerations for engineering an Excel 10 FCU System. These steps are guidelines intended to aid understanding of the product I/O options, bus arrangement choices, configuration options and the Excel 10 FCU Controllers’ role in the overall EXCEL 5000

Step No. Description

Step 1. Plan the System

Plan the use of the FCU controllers according to the job requirements. Determine the location, functionality and sensor or actuator usage. Verify the sales estimate of the number of FCU controllers and wall modules required for each model type. Also check the number and type of output actuators and other accessories required.

When planning the system layout, consider potential expansion possibilities to allow for future growth. Planning is very important to be prepared for adding HVAC systems and controllers in future projects.

System architecture.

Table 9. Application steps

1 Plan the System 2 Determine Other Bus Devices Required 3 Lay out Communication and Power Wiring 4 Prepare Wiring Diagrams 5 Order Equipment 6 Configure Controllers 7 Troubleshooting

notebook PC

using E-Vision

shielded interface

cable

Excel 10

FCU

RS-232

serial

port

SLTA

controller

LonWorks

port

The L

ONWORKS communication loop between controllers

must be laid out according to the guidelines applicable for that topology. FCU Controllers use FTT technology which allows daisy chain, star, loop or combinations of these bus configurations. See section "Step 3. Lay Out Communications and Power Wiring" (page 20) for more information on bus wiring layout, and see Fig. 13, Fig. 14, and Fig. 15 in section "Step 4. Prepare Wiring Diagrams" (page 22) for wiring details.

It is important to understand the interrelationships between

FCU controllers on the L

ONWORKS network early in the job

engineering process to ensure their implementation when configuring the controllers. (See section "Step 6. Configure Controllers" [page 28] for information on the various Excel 10 FCU Controller parameters and on Excel 10 FCU Controller point mapping.)

Step 2. Determine Other Bus Devices Required

A max. of 62 nodes can communicate on a single LONWORKS segment. If more nodes are required, a router is necessary. Using a router allows up to 125 nodes, divided between two

ONWORKS segments. The router accounts for two of these

nodes (one node on each side of the router); a Q7750A Excel 10 Zone Manager can take one node and two slots are available for operator terminal nodes, leaving 120 nodes available for Excel 10 FCU Controllers. All 120 controllers are able to communicate through the router. A Q7750A Excel 10 Zone Manager is required to connect the L to the standard EXCEL 5000 System C-Bus. Each Excel 10 Zone Manager can support no more than 120 W7752s. This is a limit set in the Excel 10 Zone Manager database and is an absolute maximum.

ONWORKS segment is set up with two unused nodes to

Each L allow for an E-Vision operator terminal to be connected to the

ONWORKS network. Multiple E-Vision terminals can be

connected to the bus at the same time. Table 10 summarizes

ONWORKS segment configuration rules.

the L

ONWORKS network

Fig. 12. Connecting the portable operator terminal to the

ONWORKS network

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Table 10. LonWorks configuration rules and device node numbers

One L

ONWORKS Segment Example max. number of nodes equals 62

one Q7750A Excel 10 Zone Manager 1 node

port for operator terminal access (E-Vision) 1 node

max. number of Excel 10 Controllers 60 nodes (wall modules are not LONWORKS nodes)

Total 62 nodes

Two LONWORKS Segments Example max. number of nodes equals 125

one Q7750A Excel 10 Zone Manager 1 node

one Q7751A Router 2 nodes (1 in each Bus Segment)

ports for operator terminal access (two E-Vision terminals) 2 nodes (1 in each Bus Segment)

max. number of Excel 10 Controllers in segment number one 60 nodes (wall modules are not LONWORKS nodes)

max. number of Excel 10 Controllers in segment number two 60 nodes (wall modules are not LONWORKS nodes)

Total 125 nodes

The max. length of an FTT LONWORKS segment is 4600 ft (1400 m) for a daisy chain configuration or 1650 ft (500 m) total wire length and (400 m) node-to-node for any other type of configuration.

NOTE: In the case of FTT L

ONWORKS segments, the

distance from each transceiver to all other transceivers and to the termination must not exceed the max. node-to-node distance. If multiple paths exist, the longest one should be used for the calculation.

If longer runs are required, add a Q7751A Router to partition the system into two segments. It is not legal to use more than one router per Excel 10 Zone Manager.

In addition, all L a Bus Termination Module. For an FTT L

ONWORKS segments require the installation of

ONWORKS segment,

one or two Termination Modules may be required depending upon the bus configuration. See section "Step 3. Lay Out Communications and Power Wiring" (page 20) and the

ONWORKS Termination Module subsection in section "Step

4. Prepare Wiring Diagrams" (page 22) for more details.

Step 3. Lay Out Communications and Power Wiring

LONWORKS Layout

The communications bus, LONWORKS, is a 78-kilobit serial link that uses transformer isolation and differential Manchester encoding. Wire the L AWG or plenum rated level IV 22 AWG non-shielded, twisted pair, solid conductor wire as the recommended wire size (see Table 11 for part numbers). An FTT L in daisy chain, star, loop or any combination thereof as long as the max. wire length requirements given in Step 2 are met.

NOTE: Due to the transformer isolation, the bus wiring does

not have a polarity; that is, it is not important which of the two L

ONWORKS terminals are connected to

each wire of the twisted pair.

LONWORKS networks can be configured in a variety of ways,

but the rules listed in Table 10 always apply. Fig. 13 and Fig. 14 depict two typical daisy chain L one as a single bus segment that has 60 nodes or less, and one showing two segments. Fig. 15 shows examples of free topology bus layouts using 2000-series devices. The bus configuration is set up using the Network Manager tool from within E-Vision (see the E-Vision User Guide).

ONWORKS using level IV 22

ONWORKS can be wired

ONWORKS network layouts;

Note: C7750A Zone Manager has internal termination module (with jumpers installed as shown).

Fig. 13. LONWORKS wiring layout for one daisy-chain network segment

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Fig. 14. LONWORKS wiring layout for two daisy-chain network segments

Fig. 15. Free topology LONWORKS layout examples

NOTE: See section "L

ONWORKS Termination" on page 25

for additional details.

IMPORTANT

Notes on Communications Wiring:

• All field wiring must conform to local codes and ordinances.

• Do not use different wire types or gauges on the

ONWORKS segment. The step change in

same L line impedance characteristics would cause unpredictable reflections on the L

ONWORKS net-

work. When using different types is unavoidable, use a Q7751A Router at the junction.

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

• Do not use shielded cable for LONWORKS wiring runs. The higher capacitance of the shielded cable will cause degradation of communications throughput. In noisy (high EMI) environments, avoid wire runs parallel to noisy power cables, or lines containing lighting dimmer switches, and keep at least 3 in. (76 mm) of separation between noisy lines and the L

• Make sure that neither of the L grounded.

Power Wiring

IMPORTANT

Notes on Power Wiring:

• All field wiring must conform to local codes and

ordinances.

• Use the heaviest gauge wire available, up to

14 AWG (2.0 mm (1.0 mm connections.

• To minimize EMI noise, do not run Triac and/or

relay output wires in the same conduit as the input wires or the L loop.

ONWORKS cable.

ONWORKS wires is

) for all power and earth ground

) with a minimum of 18 AWG

ONWORKS communications

• To comply with CE requirements, in the case of

devices having a voltage range of 50 to 1000 Vac or 75 and 1500 Vdc which are not provided with a supply cord and a plug or with other means for disconnection from the supply having a contact separation of at least 3 mm in all poles, the means for disconnection must be incorporated in the fixed wiring.

Step 4. Prepare Wiring Diagrams

General Considerations

The purpose of this step is to assist the application engineer in developing job drawings to meet job specifications. Wiring details for the W7752 FCU Controller are shown in Fig. 17. Table 12 gives additional details for output connections.

NOTE: For field wiring, when two or more wires are to be

attached to the same connector block terminal, be sure to twist them together. Deviation from this rule can result in improper electrical contact. See Fig.

16.

Table 11 lists wiring types, sizes, and length restrictions for Excel 10 FCU Controller products.

Table 11. Field wiring reference table (US part numbers shown)

wire

function

LONWORKS

(plenum)

LONWORKS

(nonplenum)*

input wiring, sensors, contacts

output wiring, actuators, relays

power wiring

recommended

min. wire size

AWG (mm

)

22 AWG

14 to 20 AWG

(2.0 to 0.5 mm

14 AWG (2.5 mm

(18 AWG (1.0

) acceptable

for short runs)

14 AWG

(2.5 mm

)

construction

twisted pair solid

conductor, non-shielded.

twisted pair solid

conductor, non-shielded.

multi-conductor (usually

five-wire cable bundle); for

runs >100 ft (30 m),

)

twisted pair or shielded cable is recommended.

)

any pair non-shielded (use

heavier wire for longer

runs).

any pair non-shielded (use

heavier wire for longer

runs).

specification

requirement

Level IV 140°F

(60°C) rating

Level IV 140°F

(60°C) rating

140°F (60°C)

rating

NEC Class 2 140°F (60°C)

rating

NEC Class 2 140°F (60°C)

rating

NOTE: PVC wire must not be used where prohibited by local fire regulations.

vendor wire type max. length ft (m)

Honeywell (US)

AK3791 (one twisted pair)

AK3792 (two twisted pairs)

See Step 2

(Europe: Belden

9H2201504)

Honeywell (US)

AK3781 (one twisted pair)

AK3782 (two twisted pairs)

See Step 2

(Europe: Belden

9D220150)

Standard thermostat wire 82.5 ft (25 m)

Honeywell (US) AK3702 (18 AWG) AK3712 (16 AWG)

200 ft (60 m)

AK3754 (14 AWG)

or equivalent

Honeywell (US) AK3754 (14 AWG)

(twisted pair)

AK3909 (14 AWG) single

conductor or equivalent

Limited by line loss

effects on power

consumption.

(See Line Loss

subsection.)

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Terminal Block Assignment and Wiring Example for the W7752 Controller

Fig. 17 illustrates terminal block assignments and wiring for an example Excel 10 W7752 FCU Controller installation. All

connections are made at terminal blocks. Table 12 lists wiring information for wiring all of the possible actuator types.

REHEAT

1. STRIP 1/2 IN. (13 MM) FROM WIRES TO BE ATTACHED AT ONE TERMAINAL

Fig. 16. Attaching two or more wires at terminal blocks

OCCUPANCY SENSOR

CHANGEOVER CONTACT

AIRFLOW CONTACT

WINDOW CONTACT

MOTION SENSOR

WALL MODULE CONNECTIONS

HEAT

COM

COOL

FAN

MED HI

RETURN

OPEN CLOSE

POWER MAINS

2. TWIST WIRES TOGETHER WITH PLIERS (A MINIMUM OF THREE TURNS).

LONW

ORKS

NETWORK IN

ONWORKS

COM

OPEN CLOSE

NETWORK OUT

3. CUT TWISTED END OF WIRES TO 3/16 IN. (5 MM) BEFORE INSERTING INTO T ERMINAL AND TIGHTENI NG SCREW. THEN PULL ON EACH WIRE IN ALL TERMINALS TO CHECK FOR GOOD MECHANICAL CONNECTION.

W7752 FAN COIL UNIT CONTROLLER

0.5A

16A

2 3

LED SETPOINT

FAN / BYPASS

TEMP SENSOR

AGND

7 8

E-BUS IN

E-BUS OUT

E-BUS OUT OUT 1 COM

OUT 1 OPEN

OUT 1 CLOSE

15 16

OUT 2 COM OUT 2 OPEN

OUT 2 CLOSE

RELAY COM

RELAY 1

RELAY 2

RELAY 3

SUPPLY VOLT

SUPPLY VOLT PWR RELAY IN (D,F MODELS ONLY)

25 26

PWR RELAY OUT (D,F MODELS ONLY)

Fig. 17. W7752 FCU Controller wiring example

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Table 12. Output assignments for various actuator types

Output type

13 14 15 16 17 18

Out 1 Terminal Out 2 Terminal

Floating 24 Vac open close 24 Vac open close 1-stage 24 Vac on/OFF — 24 Vac on/OFF — 2-stage 24 Vac stage 1 stage 2 24 Vac stage 1 stage 2

3-stage

24 Vac stage 1 stage 2 24 Vac stage 1 stage 2

stage 3 stage 3 PWM 24 Vac PWM — 24 Vac PWM — Thermal 24 Vac on/OFF — 24 Vac on/OFF —

Terminal Block Assignment and Wiring for the W7754 Controller

Table 13 lists the terminals and their functions of the Excel 10 W7754 FCU Controller. In addition to connections made at terminal blocks, there is an extra socket located to the left of the terminal blocks containing a digital output for the low-voltage PWM control of a solid-state relay employed in high-current electric reheat applications. Table 13 lists wiring information for wiring all of the possible actuator types.

Table 13. W7754 Controller, terminals and functions

term. # function

1 receiving/sending data on the LONWORKS network 2 receiving/sending data on the LONWORKS network 3 a digital input, configurable (using the LNS plug-in) to read input e.g. from a window contact, an occupancy sensor,

4 an analog input, permanently configured to read input from a wall module's temperature setpoint adjustment knob 5 an analog input, permanently configured to read input from a room temperature sensor. 6GND 7 not present 8GND 9 a digital output, permanently configured to write output switching the wall module's LED "on" or "OFF" 10 an analog input, permanently configured to read input on whether the wall module's 3-speed fan control knob has

11 12 not present 13+14 relay 4, permanently configured to switch a hardwired electrical reheat coil ON or OFF 15 common terminal for terminals 16, 17, and 18 16 17 18 19 a triac output, permanently configured to write output to OUT1, closing it 20 a triac output, permanently configured to write output to OUT1, opening it 21 a triac output, permanently configured to write output to OUT2, closing it 22 a triac output, permanently configured to write output to OUT2, opening it 23 a common terminal for terminals 19 and 20 24 a common terminal for terminals 21 and 22 25 the "N" terminal of the power supply 26 the "L" terminal of the power supply

(1)

This digital input can be enabled / disabled using the right DIP switch located on the top of the controller.

(2)

If all three relays (terminals 16, 17, and 18) are switched OFF, then the three-speed fan is switched OFF.

etc.

been set to AUTO, OFF, LOW, MEDIUM, or HIGH and whether the wall module's "occupancy override" button has been pressed.

(1)

a digital input, permanently configured to read input on whether a window contact is "open" or "closed".

(2)

relay 3, permanently configured to write output to a three-speed fan, setting it to HIGH

(2)

relay 2, permanently configured to write output to a three-speed fan, setting it to MEDIUM

(2)

relay 1, permanently configured to write output to a three-speed fan, setting it to LOW

The triac outputs or relay outputs of the Excel 10 W7754 FCU Controller can be configured (using Honeywell's LNS plug-in) for different functions.

You can configure the four triac outputs for connection to either a floating drive or to a thermal actuator. Once the outputs have been configured, the corresponding devices can be directly connected to them.

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EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Table 14. Output assignments of Excel 10 W7754 FCU Controller for various actuator types

output type stage

19 20 21 22

floating -- close open close open

1-stage

0--OFF--OFF 1--ON--ON 0 OFF OFF OFF OFF 1 OFF ON OFF ON2-stage 2 ON OFF ON OFF 0 OFF OFF OFF OFF

3-stage

1 OFF ON OFF ON 2 ON OFF ON OFF

3 ONONONON PWM -- -- PWM -- PW M thermal -- -- ON/OFF -- ON/OFF

OUT1 OUT2

LONWORKS Termination

One or two LONWORKS terminations are required, depending on the given LonWorks bus layout.

Double termination is required only when the network is a daisy-chain configuration and the total wire length is greater than 1640 ft (500 m). The max. lengths described in Step 2 must be adhered to for either a daisy chain or free topology

ONWORKS layout. See Fig. 19 for connection details for a

doubly terminated bus. See Fig. 20 for connection details for a singly terminated bus.

Two different L

ONWORKS termination module, order no.: 209541B

• L

ONWORKS connection / termination module (mountable

• L

on DIN rails and in fuse boxes), order no.: XAL-Term

removable screw-type

3-pole terminal block

ONWORKS termination modules are available:

shield shield

plug-in jumper

LON

Term in at io n

FTT/LPT Bus FTT/LPT Free Park Position

NOTE: The Q7750A Zone Manager has an internal ter-

mination circuit, although jumpers are required at the terminal block to connect it. See form number 95-7509 for details.

Fig. 19. Termination Module connections for a doubly-

terminated FTT network

Fig. 20. Termination Module connections for a singly-

terminated FTT network

Fig. 18. LONWORKS connection and termination module

25 EN0B-0377GE51 R0703

EXCEL 10 FAN COIL UNIT CONTROLLER SYSTEM ENGINEERING

Step 5. Order Equipment

After compiling a bill of materials through completion of the previous application steps, refer to Table 15 for ordering information. Contact Honeywell for information about controllers and Excel 10 wall modules with no logo.

Table 15. Excel 10 FCU Controller ordering information

Part Number Product Description Comments

Excel 10 FCU Controllers

W7752D2007

W7752E2004

W7752F2002

W7752G2000

W7752J2003

230 Vac, FTT L reheat 230 Vac, FTT L reheat 115 Vac, FTT L reheat 115 Vac, FTT L reheat 100 Vac, FTT L reheat

W7754K1001 230 Vac

W7754L1009 24 Vac W7754M1007 230 Vac W7754N1004 230 Vac W7754P1000 230 Vac

T7460 T7560

C7068A1007 (Europe) Air Temperature Sensor Return air

Echelon-Based Components and Parts

Q7751A2002 (US)

(UK)

ONWORKS router Order from local Echelon supplier (Europe)

FTT L

(Europe)

Q7752A2001 (US)

(UK)

ONWORKS Serial Interface (SLTA) Order from local Echelon supplier (Europe)

FTT L

(Europe)

209541B FTT Termination Module Two required per LONWORKS segment.

205979A (US only) SLTA Connector Cable for LONWORKS bus Serial interface to wall module or controller.

Excel 10 Zone Manager

Q7750A2003 FTT LONWORKS Zone Manager C-Bus to LONWORKS interface

XD 505A

XD 508

—

9600 baud C-Bus Communications Submodule (1 Megabit baud rate) C-Bus Communications Submodule

Serial Interface Cable, male DB-9 to female DB-9 or female DB-25.

Honeywell (US)

AK3791 (one twisted pair)

AK3792 (two twisted pairs)

Belden (Europe)

ONWORKS (plenum): 22 AW G twisted pair

solid conductor, non-shielded.

9H2201504

Honeywell (US)

AK3781 (one twisted pair)

AK3782 (two twisted pairs)

Belden (Europe)

ONWORKS (non-plenum): 22 AW G twisted

pair solid conductor, non-shielded.

9D220150

Honeywell (US) AK3725

Honeywell (US) AK3752

(typical or equivalent)

Honeywell (US) AK3702

(typical or equivalent)

Honeywell (US) AK3712

(typical or equivalent)

Inputs: 18 AWG (1.0 mm bundle. Outputs/Power: 14 to 18 AWG (2.5 to

1.0 mm

18 AWG (1.0 mm

16 AWG (1.5 mm

ONWORKS version with

ONWORKS version without

ONWORKS version with

ONWORKS version without

Excel 10 Wall Modules

Excel 10 Sensors

Cabling

) five wire cable

) twisted pair. Non-plenum

See Excel 10 wall module literature for details.

—

Obtain locally from any computer hardware vendor.

Level IV 140°F (60°C) rating

Standard thermostat wire

NEC Class 2 140°F (60°C) rating

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