Honeywell W7750A, W7750B SYSTEM ENGINEERING

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W7750A,B CONSTANT VOLUME AHU CONTROLLER

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,QWURGXFWLRQ ...........................................................................................................................	3
Description of Devices .......................................................................................	3
Control Application.............................................................................................	4
Control Provided ................................................................................................	4
Products Covered ..............................................................................................	5
Organization of Manual ......................................................................................	5
Applicable Literature ..........................................................................................	5
Product Names ..................................................................................................	5
Agency Listings..................................................................................................	6
Abbreviations and Definitions ............................................................................	6
Construction.......................................................................................................	8
Controllers.....................................................................................................	8
Performance Specifications....................................................................	10
Inputs/Outputs:............................................................................................	14
Analog Inputs: ........................................................................................	14
Digital Inputs:..........................................................................................	15
Triac Outputs (W7750B only): ................................................................	15
Wall Modules...............................................................................................	15
Configurations..................................................................................................	18
General .......................................................................................................	18
Allowable Heating and Cooling Equipment Configurations .........................	19
Staged Heating/Cooling Control .............................................................	20
Modulating Heating/Cooling Control.......................................................	20
Heat Pump Control .................................................................................	20
Economizer Control ................................................................................	21
Pneumatic Actuator Control....................................................................	21
Mixed-Output-Type Control ....................................................................	22
Occupancy Sensor......................................................................................	22
Window Open/Closed Digital Input .............................................................	23
Wall Module Options ...................................................................................	23
Dirty Filter Monitor .......................................................................................	23
Indoor Air Quality (IAQ) Override ................................................................	23
Smoke Control ............................................................................................	23
Modes of Operation..........................................................................................	23
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Overview ..........................................................................................................	25
Step 1. Plan the System ..................................................................................	25
Step 2. Determine Other Bus Devices Required..............................................	26
Step 3. Lay Out Communications and Power Wiring.......................................	26
E-Bus Layout...............................................................................................	26
Power Wiring...............................................................................................	28
Power Budget Calculation Example .......................................................	29
Line Loss ................................................................................................	29

U.S. Registered Trademark

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Step 4. Prepare Wiring Diagrams ....................................................................	32
General Considerations...............................................................................	32
W7750 Controllers.......................................................................................	32
Digital Outputs: .......................................................................................	34
E-Bus Termination Module ..........................................................................	39
Step 5. Order Equipment..................................................................................	40
Step 6. Configure Controllers ...........................................................................	43
Step 7. Troubleshooting ...................................................................................	43
Troubleshooting Excel 10 Controllers and Wall Modules ............................	43
Temperature Sensor and Setpoint Potentiometer Resistance Ranges.......	44
Alarms .........................................................................................................	44
Broadcasting the Service Message .............................................................	45
W7750 Controller Status LED .....................................................................	46
T7770C,D Wall Module Bypass Pushbutton and Override LED..................	46
T7780A DDWM Bypass Pushbutton and LCD Display
Occupancy Symbols.................................................................................	46
$SSHQGLFHV .........................................................................................................................	47
Appendix A. Using E-Vision to Commission a W7750 Controller. ...................	47
Sensor Calibration .......................................................................................	47
Setting the Pid Parameters..........................................................................	47
Appendix B. Sequences of Operation. .............................................................	48
Common Operations ...................................................................................	49
Room Temperature Sensor (RmTemp) ..................................................	50
Remote Setpoint (RmtStptPot) ...............................................................	50
Setpoint Limits (LoSetptLim and HiSetptLim) .........................................	50
Bypass Mode (StatusOvrd and StatusLed).............................................	50
BypassTime ............................................................................................	50
OverrideType ..........................................................................................	50
OverridePriority.......................................................................................	50
Cycles per Hour (ubHeatCph and ubCoolCph).......................................	51
T7770C,D or T7780A DDWM Bypass Pushbutton Operation ................	51
Standby Mode (StatusOcySen) ..............................................................	51
Continuous Unoccupied Mode................................................................	52
Occupancy Mode and Manual Override Arbitration ................................	52
Time Clock (Occ_Time_Clock) ...............................................................	52
Schedule Master (Sched_Master) ..........................................................	52
Setpoint Ramping ...................................................................................	53
Recovery Ramping for Heat Pump Systems ..........................................	53
Fan Operation.........................................................................................	54
Window Sensor (StatusWndw)...............................................................	54
Smoke Control ........................................................................................	54
Demand Limit Control (DLC) ..................................................................	54
Dirty Filter Monitor ..................................................................................	54
Start-Up ..................................................................................................	54
Temperature Control Operations.................................................................	55
Staged Cooling Control...........................................................................	55
Staged Heating Control ..........................................................................	56
Cascade Control of Modulating Cooling/Heating....................................	57
Series 60 Modulating Control .................................................................	57
Pulse Width Modulating (PWM) Control .................................................	57
Outdoor Air Lockout of Heating/Cooling .................................................	57
Economizer Damper Control ..................................................................	57
Indoor Air Quality (IAQ) Override............................................................	58
Discharge Air Low Limit Control .............................................................	58
Economizer Enable/Disable Control .......................................................	58
Appendix C. Complete List of Excel 10 W7750 Controller User Addresses. ...	58
Appendix D. Q7750A Excel 10 Zone Manager Point Estimating Guide. .......	154
Approximate Memory Size Estimating Procedure. ....................................	154
Appendix E. Sensor Data for Calibration........................................................	155
Resistance Sensors. .................................................................................	155
Voltage/Current Sensors. ..........................................................................	157

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,1752'8&7,21	Interoperability standard for Roof Top Unit Controllers
	(see Fig. 8).

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The W7750 is the Constant Volume Air Handling Unit (CVAHU) Controller in the Excel 10 product line family. The CVAHU is a LonMark compliant device designed to control single zone and heat pump air handlers. W7750 systems control the space temperature in a given zone by regulating the heating and cooling equipment in the air handler that delivers air to that space. The W7750 air handler is typically an all-in-one constant air volume packaged unit, located on the roof of the building. In addition to standard heating and cooling control, the W7750 provides many options and advanced system features that allow state-of-the-art commercial building control. The W7750 Controller is capable of stand-alone operation; however, optimum functional benefits are achieved when the network communication capabilities are used. The W7750 utilizes the Echelon® LonWorks® network (E-Bus) for communications, and conforms with the Echelon® LonMark HVAC

The T7770 direct-wired Wall Modules or the network configurable T7780A Digital Display Wall Module (DDWM) are used in conjunction with W7750 Controllers. The zone controlled by the W7750 Controller typically can use a T7770A through D Wall Module or a T7780A DDWM which includes a temperature sensor for space temperature measurement. Additional features available in T7770A through D models include analog setpoint input knob, override digital input pushbutton, override status LED and E- Bus network access jack. The DDWM includes an LCD panel for controller status display and keypad for user interface and an E-Bus network access jack.

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

Q7752A

E-BUS

SERIAL

ADAPTER

PERSONAL COMPUTER TOOLS

E-VISION

CARE

E-BUS COMMUNICATIONS NETWORK

C-BUS COMMUNICATION NETWORK

EXCEL 10
Q7750A
ZONE		EXCEL 500
MANAGER	EXCEL BUILDING SUPERVISOR	EXCEL 500
MANAGER	EXCEL BUILDING SUPERVISOR
C-BUS TO E-BUS
INTERFACE DEVICE		Q7740A
		2-WAY
E-BUS COMMUNICATIONS NETWORK		REPEATER

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

		EXCEL 10
	Q7751A	W7750B
	Q7751A	CVAHU
	FTT	CVAHU
	FTT	CONTROLLER
	E-BUS	CONTROLLER
	E-BUS
	ROUTER

1	2	3	4	5	6
	2	3	4	5	6	7	8	9	10
									10	11	12	13	14	15	J3

EXCEL 10 T7770

WALL MODULE

EXCEL 10 W7751F

PANEL PLENUM

MOUNT VERSION

VARIABLE AIR VOLUME

CONTROLLER

EXCEL 10 T7780A

DIGITAL DISPLAY

WALL MODULE

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W7750 systems in commercial buildings typically incorporate a packaged air handler system that delivers a constant volume of air at preconditioned temperatures to the zone being served. Each zone is usually serviced by a separate AHU; however, sometimes two or more AHUs service the same zone. Note that the W7750 is not designed to control Variable Air Volume (VAV) air handlers or Multi-Zone air

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handlers, where one air handler simultaneously controls the space temperature in many zones.

The W7750 can control staged or modulating heating and cooling coils, mixed air economizer dampers, and the system fan. Control of heat pump units, where the compressor(s) is used for both cooling and heating, is also provided. The zone the W7750 services can use a T7770 or a DDWM for space temperature sensing and an E-Bus network access for users. Fig. 2 shows a typical W7750 control application.

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FILTER	COIL	COIL
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OUTDOOR
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	-	+
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EXCEL 10

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The W7750 Controller is designed to control a single air handler to maintain the units space temperature at the current setpoint. Heating and cooling control is provided for either staged or modulating equipment. Up to four stages of

mechanical cooling and up to four stages of heating are allowed. Modulating outputs can be either IORDWLQJ W\SH such

as a Series 60 control, or Pulse Width Modulated (PWM) control.

The economizer dampers can be controlled directly with floating or PWM outputs, or indirectly using a digital output as an enable/disable signal to a packaged economizer

controller. The economizer enable function, which decides when to allow outdoor air to be used for free cooling, can be configured to one of ten strategies based on the inputs. For more details, see Appendix B— Sequences of Operation. When the economizer position is controlled from the W7750, the minimum position setting (for ventilation requirements) can be adjusted based on indoor air quality (IAQ) needs in the space. IAQ monitoring is provided through either a CO2 sensor or a digital input from a space-mounted IAQ limit switch.

For heat pump configurations, up to four compressors can be controlled, along with up to four stages of auxiliary heat, and a heat/cool change over valve. Including the supply fan, the

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combination of these items may not exceed eight outputs if a W7750B is used, or six outputs for a W7750A.

Like the W7751 VAV Box Controller, the W7750 Controller can monitor a space-mounted occupancy sensor, and a door/window contact. These inputs affect the operational mode of the controller (see Table 5 for a list of all possible modes of operation).

The W7750 Controller allows other controllers in the system to use the physical inputs and outputs. A digital input and an analog input can be configured to read switch states and voltage sensor values, respectively, and send them out over the E-Bus network. Another device, such as the Q7750A Zone Manager, can use these values in custom control strategies. Additionally, two of the W7750 digital outputs are available for control program use. These outputs only respond to signals sent over the network, and are not controlled by the W7750 internal control algorithms.

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This System Engineering Guide describes how to apply the Excel 10 family of W7750 CVAHU Controllers and related accessories to typical applications. The specific devices covered include:

•W7750A,B Controllers.

•T7770A through D Wall Modules.

•T7780A DDWM.

•Q7750A Excel 10 Zone Manager.

•Q7751A,B Router (FTT to FTT and TPT to FTT).

•Q7752A Serial Interface.

•Q7740A,B Repeaters (2-way and 4-way).

•209541B FTT Termination Module.

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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.

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The following list of documents contains information related to the Excel 10 W7750 CVAHU Controller and the EXCEL 5000® OPEN SYSTEM in general.

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74-2076C Excel 10 Technical Literature Collation

74-2956 Excel 10 W7750A,B Controller Specification

Data

74-2697 Excel 10 T7770A,B,C,D,E,F,G Wall Module

Specification Data

74-2955 T7780A Digital Display Wall Module

Specification Data

74-2950 Excel 10 Q7750A, Zone Manager

Specification Data

74-2952 Excel 10 Q7751A,B Router Specification Data

74-2954 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

95-7521 Excel 10 W7750A,B Controller Installation

Instructions

95-7538 Excel 10 T7770A,B,C,D,E,F,G 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 W7750 Controller is available in two models:

•: $ Constant Volume AHU Controller - W7750A Version.

•: % Constant Volume AHU Controller - W7750B Version.

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The T7770 Wall Module is available in four models. The T7770 Wall Modules will work with all Excel 5000 and Excel 10 Controllers (except the W7751A,C,E,G):

•7 $ [[[ Wall Module with nonlinearized 20 Kohm NTC sensor only.

•7 $ [[[ Wall Module with nonlinearized 20 Kohm NTC sensor and E-Bus network jack.

•7 % [[[ Wall Module with nonlinearized 20 Kohm NTC sensor, 10 Kohm setpoint, and E-Bus network jack.

•7 & [[[ Wall Module with nonlinearized 20 Kohm NTC sensor, 10 Kohm setpoint, bypass button and LED, and E-Bus network jack.

•7 ' [[[ Wall Module with nonlinearized 20 Kohm NTC sensor, bypass button and LED, and E-Bus network jack.

NOTE: The T7770B,C Models are available with a absolute 55 to 85°F (10 to 85°C) or a relative scale plate adjustable in E-Vision to ± 18°F (± 5°C).

Mode, Fan mode/speed selection, and E-Bus network.

Other products:

•4 $ Excel 10 Zone Manager.

•4 $ % Bus Router.

•4 $ Serial Adapter.

•4 $ % FTT Repeaters.

•% FTT Termination Module.

Refer to Table 11 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.

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Table 1 provides information on agency listings for Excel 10 products.

The T7780A DDWM is available in one model:

•7 $ DDWM displays and provides space temperature, setpoint, Occ/Unocc override, Application

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: $ % &RQWUROOHUV	UL	Tested and listed under UL916 (file number E87741).
	cUL	Listed (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). 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 can cause interference to radio or TV reception and require
		the operator to take steps necessary to correct the interference.
7 $ WKURXJK ' :DOO	UL	(Not applicable.)
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	cUL	(Not applicable.)
	FCC	(Not applicable.)
7 $ '':0	CE	Emissions; EN50081-1 and 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 A Computing Device.
4 $ ([FHO	UL	Tested and listed under UL916, file number S4804 (QVAX, PAZY).
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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.

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$+8 Air Handling Unit; the central fan system that includes the blower, heating equipment, cooling equipment, ventilation air equipment, and other related equipment.

&2 Carbon Monoxide. Occasionally used as a measure of indoor air quality.

&2 Carbon Dioxide. Often used as a measure of indoor air quality.

&$5( Computer Aided Regulation Engineering; the PC based tool used to configure C-Bus and E-Bus devices.

& %XV Honeywell proprietary Control Bus for communications between EXCEL 5000® System controllers and components.

&38 Central Processing Unit; an EXCEL 5000® OPEN SYSTEM controller module.

F8/ Underwriters Laboratories Canada

&9$+8 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.

'') Delta Degrees Fahrenheit.

'':0 Digital Display Wall Module.

' ; 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.

( %XV Honeywell implementation of Echelon® LonWorks® network for communication among Excel 10 Controllers.

( %XV 6HJPHQW An E-Bus section containing no more than 60 Excel 10s. Two segments can be joined together using a router.

(FKHORQŠ The company that developed the LON® bus and the Neuron® chips used to communicate on the E-Bus.

(FRQRPL]HU Refers to the mixed-air dampers that 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 HFRQRPL]HU GDPSHUV.

(0, Electromagnetic Interference; electrical noise that can cause problems with communications signals.

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

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

((3520 Electrically Erasable Programmable Read Only Memory; the variable storage area for saving user

setpoint values and factory calibration information.

(QWKDOS\ The energy content of air measured in BTUs per pound (KiloJoules per Kilogram).

(3520 Erasable Programmable Read Only Memory; the firmware that contains the control algorithms for the Excel 10 Controller.

([FHO =RQH 0DQDJHU A controller that is used to 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.

NOTE: The Q7750A Zone Manager can be referred to as E-Link in the internal software, CARE.

( 9LVLRQ User interface software used with devices that operate via the FTT E-Bus communications protocol.

)LUPZDUH Software stored in a nonvolatile memory medium such as an EPROM.

)ORDWLQJ &RQWURO Refers to Series 60 Modulating Control of a valve or damper. Floating Control utilizes one digital output to pulse the actuator open, and another digital output to pulse it closed.

)77 Free Topology Transceiver.

,$4 Indoor Air Quality. Refers to the quality of the air in the conditioned space, as it relates to occupant health and comfort.

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

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

. Degrees Kelvin.

/HYHO ,9 Refers to a classification of digital communication wire. Formerly known as UL Level IV, but QRW equivalent to Category IV cable. If there is any question about wire compatibility, use Honeywellapproved cables (see Step 5 Order Equipment section).

1(& National Electrical Code; the body of standards for safe field-wiring practices.

1(0$ National Electrical Manufacturers Association; the standards developed by an organization of companies for safe field wiring practices.

1RGH A Communications Connection on a network; an Excel 10 Controller is one node on the E-Bus network.

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

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

3RW Potentiometer. A variable resistance electronic component located on the T7770B,C Wall Modules; used to allow user-adjusted setpoints to be input into the Excel 5000 or Excel 10 Controllers.

3:0 Pulse Width Modulated output; allows analog modulating control of equipment using a digital output on the controller.

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

6XEQHW An E-Bus segment that is separated by a router from its Q7750A Zone Manager.

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

737 Twisted Pair Transceiver.

9$ Volt Amperes; a measure of electrical power output or consumption as applies to an ac device.

9DF Voltage alternating current; ac voltage rather than dc voltage.

9$9 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.

92& 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 CVAHU Controllers (also see CVAHU).

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

:DOO 0RGXOH The Excel 10 Space Temperature Sensor and other optional controller inputs are contained in the T7770 Wall Modules or T7780A DDWM. See Application Step 5. Order Equipment for details on the various models of Wall Modules.

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

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The Excel 10 W7750 Controller is available in two different models. The W7750A Model, which is a low cost controller made for simple single zone air handlers and heat pump controls. The W7750B Model is intended for more complex applications.

The W7750B Model uses Triacs for its digital outputs, where as the W7750A Model uses dry-contact relays.

All wiring connections to the controller are made at screw terminal blocks. Connection for operator access to the E-Bus is provided by plugging the SLTA connector cable into the E- Bus communications jack.

The W7750A and W7750B Models consist of a single circuit board that is mounted in a sheet metal subbase and protected by a factory snap-on cover. The two controllers have the same physical appearance except for terminals 16 through 20 and different labels next to the wiring terminals (see Fig. 3 or 5). The controllers mount with two screws (see Fig. 4 or 6). Using DIN rail adapters (see Fig. 7) the controllers can also be snapped onto standard EN 50 022 35 mm by 7.5 mm (1-3/8 in. by 5/16 in.) DIN rail. DIN rail is available through local suppliers. If using DIN rail also purchase from Augat Inc. part number 2TK2D DIN rail (adapters) two each for every controller (see Fig. 7). Wires are attached to the screw terminal blocks on both sides of the controller.

A channel in the cover allows the controller status LED to be visible when the cover is in place. There are no field-

serviceable parts on the circuit board and, therefore, LW LV LQWHQGHG WKDW WKH FRYHU QHYHU EH UHPRYHG.

The W7750A,B can be mounted in any orientation. Ventilation openings were designed into the cover to allow proper heat dissipation regardless of the mounting orientation. See Fig. 4 and 6.

The input/output and control differences between the two models are summarized in Table 2. The I/O points in Table 2 are the free I/O points that are not reserved for Wall Module use.

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W7750A

31	30	29	28	27	26	25
							24	23
									22	21

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									24
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19	18	17	16

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LED 2

BYPASS 3

SNSR 4

GND 5

SET PT 6

AI-1	GND	DI-1	GND	GND
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7	8	9	10	11	12

NOT USED

E-BUS
14	15

E-BUS JACK

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'LJLWDO 2XWSXWV			6 Relay Outputs		8 Triac Outputs
'LJLWDO ,QSXWV		2		4
:DOO 0RGXOH		1*		1*
$QDORJ ,QSXWV		1		4
			(Resistive Input Only)		(2 Resistive and 2 Voltage/Current Inputs)
'& 3RZHU			None		20 Vdc available to power optional sensors
)ORDWLQJ 6HULHV &RQWURO			Economizer Only		Heating, Cooling, and/or Economizer
3:0 &RQWURO			None		Heating, Cooling, and/or Economizer

*The T7770 Wall Modules includes I/O points for two analog inputs for the space temperature and the setpoint knob, a digital input for the Bypass pushbutton, and a digital output for the LED Bypass Indicator. These W7750 I/O points are configurable, but are normally used for the Wall Module.

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24 Vac with a minimum of 20 Vac and a maximum of 30 Vac at either 50 or 60 Hz. The W7750A,B power consumption is 6 VA maximum at 50 or 60 Hz. The W7750A,B is a NEC Class 2 rated device. This listing imposes limits on the amount of power the product can consume or directly control to a total of 100 VA.

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The individual Triac outputs incorporate an internal common connection with the input power transformer. The Triacs provide a switched path from the hot side (R) of the transformer through the load to the common of the transformer. The W7750B Controller design PXVW use the same power transformer for any loads connected to that controller; see Fig. 28.

Each individual Triac is rated 1A at 30 Vac maximum. Under all operating conditions, the maximum load/source power budget for the W7750B Controller is 100 VA. Actual allowable Triac current is 500 mA MAX.

74-2958

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W7750B

31	30	29	28	27	26	25
	30	29					24	23



DI-4 GND		DI-3 DI-2		GND		VAC	VAC	1
DI-4 GND					DI-1	VAC	24
						24	24
						24	COM OUT
							COM OUT

2 OUT

3 OUT

4 OUT

19	18	17	16
		17
5	6
5	6	7	8
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	1	2
		2

BYPASS 3

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GND 5

SET PT 6

AI-1 GND
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7	8

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GND 11

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14	15

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

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64K ROM/PROM (6K reserved for network operations,

58K usable for control algorithm code).

512 bytes EEPROM.

2K RAM.

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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 T7770 Wall Modules or T7780A DDWM.

74-2958

Honeywell W7750A, W7750B SYSTEM ENGINEERING

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31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16
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						VAC	24	1	2	3	4	5	6	7	8
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The W7750A,B Controller uses an Free Topology Transceiver (FTT) transformer-coupled communications port running at 78 kilobits per second (kbs). Using the transformer-coupled 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 mm2) plenum or nonplenum rated unshielded, twisted pair, solid conductor wire. For nonplenum areas, use Level IV 22 AWG (0.34 mm2) such as US part AK3781 (one pair) or US part AK3782 (two pair). In plenum areas, use plenum-rated Level IV, 22 AWG (0.34 mm2) such as US part AK3791 (one pair) or US part AK3792 (two pair). (See Tables 9 and 11 for part numbers.) Contact Echelon Corp. Technical Support for the recommended vendors of Echelon approved cables.

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The FTT supports polarity insensitive free topology wiring. Freeing the system installer from the need to wire using a bus topology. Star, bus, mixed, and loop wiring are all supported by this architecture. The maximum E-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 total wire length is exceeded, then a Q7740A 2-Way Repeater or a Q7740B 4-Way Repeater can be used to allow the number of devices to be spread out as well as increasing the length of wire over which they communicate. The maximum number of repeaters per segment is one (on either side of the router). A Q7751A,B E-Bus Router can also be used to effectively double the maximum E-Bus length. The advantage of using the router is that it will segregate traffic to a segment while when using the repeater, all traffic is repeated on each segment. When utilizing a doubly terminated E-Bus structure, use a continuous daisy-chain with no stubs or taps from the main backbone, The maximum E-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. This will aid in compliance verification and future expansion of the FTT network. This will also keep unknown or inaccurate wire run lengths, node-to-node (device-to-device) distances, node counts, total wire length, inaccurate repeater/router locations, and misplaced or missing terminations minimized.Refer to E- Bus Wiring Guidelines form, 74-2865 for complete description of network topology rules.

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W7750 Controllers support the LonMark Functional Profile number 8030 Roof Top Unit Controller, version 1.0

(see Fig. 8).

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Hardware

Output

Roof Top Unit

Controller number 8030

nv1	nviSpaceTemp			nv3	nvoSpaceTemp
nv1	SNVT_temp_p		Mandatory	nv3	SNVT_ temp_p
	SNVT_temp_p		Mandatory		SNVT_ temp_p
			Network
nv2	nviSetPoint		Variables	nv4	nvoUnitStatus
nv2	SNVT_temp_p			nv4	SNVT_hvac_status
nv5	nviApplicMode			nv10	nvoEffectSetPt


	SNVT_hvac_mode				SNVT_ temp_p
	SNVT_hvac_mode				SNVT_ temp_p
nv6	nviOccCmd			nv11	nvoOutsideTemp


	SNVT_occupancy				SNVT_ temp_p
			Optional
			Optional
nv7	nviSetPtOffset		Network	nv12	nvoOutsideRH
	nviSetPtOffset		Variables		nvoOutsideRH
	SNVT_ temp_p		Variables		SNVT_ lev_percent
nv8	nviOutsideTemp			nv16	nvoCO2


	SNVT_ temp_p				SNVT_ppm
nv9	nviOutsideRH


	SNVT_lev_percent
nv13	nviSpaceRH


	SNVT_ lev_percent
nv14	nviCO2


	SNVT_ppm
	SNVT_ppm
nv15	nviEmergCmd


	SNVT_hvac_emerg


		Configuration Properties
	nc49 - Send Heartbeat			(mandatory)
	nc60 - Occupancy Temperature Setpoints (mandatory)
	nc48 - Maximum Receive Time			(optional)
	nc17 - Location			(optional)
	nc42 - CO 2Limit			(mandatory)

Manufacturer

Defined

Section

Hardware

Input	M11580

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Operating Temperature: -40 to 150°F (-40 to 65.5°C).

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-40 to 150°F (-40 to 65.5°C).

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5% to 95% noncondensing.

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Rated V2 level compliant.

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The W7750A Unit supports the following hardware features:

•Three 20 Kohm NTC (1000 through 150,000 ohm) or PT3000 (250 through 12,000 ohm) resistive analog inputs (one reserved for space temperature and one reserved for the setpoint knob).

•Three dry contact digital inputs (one reserved for the Bypass pushbutton).

•LED digital output (RQO\ for the wall module LED) 2.5V at 3 mA.

•Six 24 Vac relay digital outputs (1.5A relays rated at 7.5A inrush current).

The W7750B Unit supports the following hardware features:

•Four 20 Kohm NTC (1000 through 150,000 ohm) or PT3000 (250 through 12,000 ohm) resistive analog inputs (one reserved for space temperature and one reserved for the setpoint knob).

•Two 0.2 to 10 VDC or 2 to 20 mA (user selectable) analog inputs.

•Five dry contact digital inputs (one reserved for the Bypass pushbutton).

•Eight 24 Vac Triac digital outputs (500 mA MAX).

•LED digital output (RQO\ for the wall module LED) 2.5V at 3 mA.

•One 22 Vdc power supply for auxiliary devices with a maximum current of 50 mA.

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Type: RTD.

Supported Sensors: T7770A,B,C,D; T7780A.

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Type: RTD.

Supported Sensors: C7100A1015*, C7770A1006, C7031B1033, C7031C1031, C7031D1062, C7031F1018, C7031J1050, C7031K1017.

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Type: RTD.

Supported Sensors: C7170A1002.

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Type: RTD.

Supported Sensors: C7100A1015*, C7770A1006, C7031B1033, C7031C1031, C7031D1062, C7031F1018, C7031J1050, C7031K1017.

*The PT3000 sensor is not recommended for floating control (real time - discharge or return configured as space sensor). The PT3000 sensor is intended for monitoring or differential (staged) control

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Type: Voltage/Current.

Supported Sensors: C7600B1000 and C7600B1018

(2 to 10V), C7600C1008 (4 to 20mA).

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Type: Voltage/Current.

Supported Sensors: C7600B1000 and C7600B1018

(2 to 10V), C7600C1008 (4 to 20mA).

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Type: Current.

Supported Sensors: C7400A1004 (4 to 20mA).

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Type: Current.

Supported Sensors: C7400A1004 (4 to 20mA).

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Type: Voltage.

Supported Sensors: Third party 2 to 10V, 0 to 5 inw (1.25 kPa) differential pressure sensors.

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Type: Voltage.

Supported Sensors: Third party 0 to 10V, 0 to 2000 ppm CO2 sensors.

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Type: Voltage.

Supported Sensors: Third party 2 to 10V, 2 to 10 volts displayed.

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

Two of the following Digital Inputs (DIs) can be configured when using the W7750A, and four of the following when using the W7750B:

—Fan Status:

Contact Closed = Fan on

—IAQ Switch:

Contact Closed = Poor Air Quality

—Time Clock:

Contact Closed = Occupied Mode; Contact Open = Unoccupied Mode

—Schedule Master:

Contact Closed = Local time clock is used as master time clock

—Economizer Enable Signal:

Contact Closed = Economizer Enabled for cooling use

—Smoke Monitor:

Contact Closed = Smoke Detected

—Dirty Filter:

Contact Closed = Dirty Filter

—Shutdown Signal:

Contact Closed = Shut off all equipment

—Occupancy Switch:

Contact Closed = Room is Occupied; Contact Open = Room is Unoccupied

—Window Monitor:

Contact Closed = Window is Closed

—Wall Module Bypass Pushbutton:

Momentary DI (See Appendix B— Sequences of Operation for bypass details.)

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—Power ratings: 20 Vac to 30 Vac at 25 mA MIN to 500 mA MAX current for any voltage.

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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 (COM terminal on the W7750B Model); see Fig. 28 for wiring example.

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The T7770 Wall Modules for the Excel 5000 and Excel 10 Controllers are available in a variety of configurations. The models T7770A1006 and T7770C1002 are shown in Fig. 9. The T7770B,D are the same physical size (see Product Names section for differences).

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APPLIC ATIONS

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29/32 (23)

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DIP Switch	W7753 XL600-XL20	1,3,5=on; 2,4=off 2,4=on; 1,3,5=off	LED RETURN	BYPASS	LED LED	FAN BYPASS/FAN	SETPT SETPT	SENSOR SENSOR	GND AL COM		T7770C

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Tables 3 and 4 provide an overview of the Excel 10 W7750 configuration options. All W7750s are assumed to have a supply fan digital output. Additionally, Tables 3 and 4 list the general mechanical equipment options available with the W7750 Controller. See Application Step 6. Configure Controllers, for further information on configurations.

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For floating control, the Excel 10 W7750 Controller is designed to work only with Series 60 valve and damper actuators. Full stroke actuator drive-time must be between 20 and 240 seconds (0.25 to 4.0 minutes).

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1.Mandatory Digital Output.

2.Conventional.

3.Heat Pump.

1.None.

2.Connected: Contacts closed equals Occupied.

3.Network (Occ/Unocc signal received via the E-Bus network).

1.None.

2.Physically Connected: Contacts closed equals window closed.

3.Network (Window Open/Closed signal received via the E-Bus).

1.Local (direct wired to the controller).

2.Network (sensor value received via the E-Bus).

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(All four types have an E-Bus access jack)

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1.Sensor only.

2.Sensor and Setpoint adjust.

3.Sensor, Setpoint adjust and Bypass.

4.Sensor and Bypass.

1.None.

2.Physically Connected: Contacts closed equals smoke detected.

3.Network (Emergency/Normal signal received via the E-Bus).

74-2958

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2SWLRQ

Type of Heating

Type of Cooling

Type of

Economizer

IAQ Option

Filter Monitor

Option

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1.One stage.

2.Two stages.

3.Three stages.

4.Four stages.

5.None.

1.One stage.

2.Two stages.

3.Three stages.

4.Four stages.

5.None.

1.Digital Output Enable/Disable signal for controlling an external economizer package.

2.Series 60 Modulating electric damper motor, or pneumatic via transducer.

3.None.

1.None.

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1.One stage.

2.Two stages.

3.Three stages.

4.Four stages.

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

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

7.None.

1.One stage.

2.Two stages.

3.Three stages.

4.Four stages.

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

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

7.None.

1.Digital Output Enable/Disable signal for controlling an external economizer package.

2.Series 60 Modulating electric damper motor, or pneumatic via transducer.

3.Pulse Width Modulating electric damper motor, or pneumatic via transducer.

4.None.

1.None.

2. Local IAQ Digital Input— directly 2. Local IAQ Digital Input— directly wired to the controller. wired to the controller. (Contacts closed means poor IAQ is detected.) (Contacts closed means poor

IAQ is detected.)

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

1.None.

2.Local Dirty Filter Digital Input— directly wired to the controller. (Contacts closed means that the filter is dirty.)

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

4.Local CO2 Analog Input— directly wired to the controller. (The sensor must be a 0 to 10V device representing 0 to 2000 PPM CO2.)

1.None.

2.Local Dirty Filter Digital Input— directly wired to the controller. (Contacts closed means that the filter is dirty.)

3.Local Analog Input for Differential Pressure across the Filter (directly wired to the controller). The sensor must be a 2 to 10V device representing 0 to 5 inw (1.25 kPa).

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Each W7750 device can control a variety of different types of mechanical cooling and heating equipment within roof top air handlers. See Fig. 17 through 21 for a conceptual overview of some typical configurations. For specific wiring details, see the Prepare Wiring Diagrams section.

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Staged equipment control is available for up to four stages of heating or four stages of cooling. On the W7750, the stages are activated through digital outputs (Triacs on the W7750B, dry-contact relays on the W7750A), one for each stage, wired to 24 Vac contactors (see Fig. 25 and 28 in Step 4. Prepare Wiring Diagrams section for wiring details). Note that the number of physical Digital Outputs (DOs) on the controller limits the total number of stages that can be controlled. For example, the W7750A Model has six digital outputs, and because one is used for the supply fan, there are five DOs available for any combination of heating and cooling stages (with a maximum of four stages of heating and four stages for cooling). The W7750B Model offers two additional DOs, for a total of eight. Fig. 12 shows a typical application of two stages of heat and two stages of cooling.

		COOL	HEAT
		COIL	COIL
MIXED	FAN		DISCHARGE
AIR	FAN		AIR
AIR			AIR
		-	+
FAN	COMPRESSORS
FAN
STARTER
			T7770
	Y1	Y2
		GAS COMBUSTION
			CONTROLS
			W1 W2
EXCEL 10
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W7750A,B
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EXPANDED
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The W7750 Controller provides modulating equipment control for heating and cooling equipment (and economizer dampers, see Fig. 15) using either Series 60 Floating Control or Pulse Width Modulated (PWM) control, (PWM control is available on the W7750B RQO\). The Series 60 Modulating Control is provided through two Relay digital outputs on the W7750A or two Triac digital outputs on the W7750B, one to pulse the valve actuator open and one to pulse it closed. PWM control positions the actuator based on the length, in seconds, of the pulse from the digital output. For PWM, the controller outputs a pulse whose length consists of two parts, a minimum and a maximum. The minimum pulse time represents the analog value of 0 percent and the maximum pulse length that represents an analog value of 100 percent. If the analog value is greater than 0 percent, an additional

time is added to the minimum pulse time. The length of time added is directly proportional to the magnitude of the analog value. The PWM actuator will begin to use the analog value at the end of the pulse and will continue to use this value until a new pulse is received. Refer to appendix B under PWM Control for an example. Series 60 actuators are generally less expensive than those for PWM, but the tradeoff is that PWM requires only a single controller digital output while floating control uses two DOs. Refer to appendix B under Series 60 Modulating Control for an example. Fig. 13 illustrates a system with modulating heating and cooling (see Fig. 25 and 29 in Step 4. Prepare Wiring Diagrams section, for wiring details).

COOL HEAT

COIL COIL

MIXED	FAN	DISCHARGE
AIR	FAN	AIR
AIR		AIR
	-	+
FAN	CHILLED	HOT
FAN	WATER	WATER
STARTER	VALVE	VALVE
		T7770
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		T7780A
		M10093A

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NOTE: Pneumatically actuated valves can be controlled using a pneumatic transducer device. See Fig. 16. Also, transducer devices are available from third party vendors to convert PWM outputs to a voltage or current signal if desired.

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The W7750 Controller handles heat pump applications similarly to staged heating/cooling control. Heat pump applications are supported by providing outputs for up to four compressor stages, a change-over relay for the refrigerant reversing valve, and up to four stages of auxiliary heat. Note that the W7750A Model has six digital outputs, and therefore, with one DO used for the supply fan and one for the changeover relay, there are four outputs available for any combination of compressors and auxiliary heat stages. The W7750B Model offers two additional DOs for a total of eight. Fig. 14 illustrates a typical heat pump system with auxiliary heat (see Fig. 25 and 29 in Step 4. Prepare Wiring Diagrams section for wiring details).

74-2958

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		SHARED	AUXILIARY
		HEAT AND	HEAT
		COOL COIL	STAGE(S)
MIXED	FAN
AIR	FAN
AIR
			+	DISCHARGE
				AIR
	FAN
	STARTER
	COMPRESSOR AND
	CHANGEOVER VALVE
	COMP 1	CHANGEOVER
		CHANGEOVER
	COMP 2	RELAY
	COMP 2

T7770

EXCEL 10

CVAHU

W7750A,B

T7780A

M10100A

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Economizer control is available concurrently with any configuration in the W7750 when DOs are not all used by the heating and cooling equipment. Two types of economizer controls are supported by the W7750 Controller, modulating control and enable/disable control. Modulating control can be either Series 60 Floating Control or PWM control (PWM control is available on the W7750B RQO\). A discharge air temperature sensor is required for modulating economizer damper control. Enable/disable control is provided to emulate the Honeywell T7300 thermostat economizer operation, where a DO tracks the occupancy status of the controller. An external packaged economizer control then modulates the dampers. For modulating control, the economizer is enabled or disabled based on one of ten available strategies (see Appendix B— Sequences of Operation— Economizer Enable/Disable Control section, for further details). Fig. 15 illustrates a system with modulating economizer dampers (see Fig. 27, 29 and 30 in Step 4. Prepare Wiring Diagrams section, for wiring details).

)LJ +HDW SXPS ZLWK WZR FRPSUHVVRUV DQG DX[LOLDU\
KHDW VWDJH V
	COOL	HEAT
	COIL	COIL
OUTDOOR	FAN	DISCHARGE
AIR	FAN	AIR
AIR		AIR
	-	+
M	FAN
	FAN
	STARTER
PWM
OR		DISCHARGE
SERIES 60	RETURN	DISCHARGE
SERIES 60	RETURN	TEMPERATURE
FLOATING	AIR	SENSOR REQUIRED
MOTOR		FOR ECONOMIZER
		CONTROL
	EXCEL 10
	CVAHU
	W7750A,B	T7770
		T7780A
		M10101A
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The W7750B Controller can control pneumatic actuators for any or all of the three modulating outputs provided by the control algorithm (heat, cool and economizer). Control of

pneumatic water/steam valves and damper actuators is provided through a transducer device using either Series 60 Floating Control or PWM DOs. A floating-to-pneumatic, or a PWM-to-pneumatic transducer is required for each output signal. The W7750A Controller can only be configured to use

74-2958

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Series 60 Floating Control for the modulating economizer output and must use staged outputs for heating and cooling control. There are no PWM outputs configurable on the W7750A model.

For projects with existing pneumatically actuated reheat valves, the Excel 10 W7750 Controller output must be converted to a pneumatic signal using a transducer device developed for use with Excel 10 Controllers. The transducer is available through Honeywell, or directly from the manufacturer, Mamac Systems (see Table 11 for ordering information).

Fig. 16 depicts a typical W7750 System with modulating heating valve using a pneumatic valve actuator. Also see Fig. 33 for wiring an MMC325 Pneumatic Transducer to a W7750A,B Controller.

NOTE: When choosing the pneumatic pressure range, make sure that the closeoff pressure is 2 to 3 psi greater than that of the spring range. When using a spring range of 5 to 10 psi with 10 psi as the closed position, GR QRW use the 0 to 10 psi model of the MMC325 Transducer; use the 0 to 20 psi transducer as the recommended selection.

			HEAT
			COIL
MIXED	FAN		DISCHARGE
AIR	FAN		AIR
AIR			AIR
			+
			PNEUMATIC
FAN			ACTUATOR
STARTER		VALVE
			T7770
		T7780A	1
		T7780A	M
			M
		MMC325	PNEUMATIC
			PNEUMATIC
			TRANSDUCER

1PNEUMATIC MAIN OR BRANCH LINE MUST BE 1/4 IN. (6 MM) OR LARGER TUBING. A MINIMUM OF 6 FT (1.8M) OF TUBING IS NEEDED IN A BRANCH LINE.

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The W7750B Controller provides control for mixed-output- types of applications such as PWM heating and staged cooling control occurring simultaneously with Series 60 Floating Economizer Damper Control.

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Excel 10 W7750 Controllers provide a digital input for connection to an occupancy sensor. This is a device, such as a passive infrared motion detector, that contains a dry contact (see following NOTE) closure to indicate whether or not people are present in the space. The Excel 10 W7750 Controller expects a contact closure to indicate the space is Occupied. See Fig. 25 through 32 in Application Step 4, Prepare Wiring Diagrams, for details on wiring connections.

The control algorithm in the Excel 10 Controller uses the occupancy sensor, if configured, to determine the Effective Occupancy (see Table 5) mode of operation. If the Time Of Day (TOD) schedule indicates an Occupied state, and the occupancy sensor contact is closed, the Effective Occupancy mode is Occupied. However, if the TOD schedule indicates an Occupied state and the occupancy sensor contact is open, then the Effective Occupancy mode is STANDBY. The temperature control algorithm is then controlled to the STANDBY Cooling and Heating Setpoints.

If the occupancy sensor is not configured, a local controller can be put in the STANDBY mode only by either a one-to- one association of the occupancy sensor from another Excel 10 Controller to the local controller, or by receiving the STANDBY mode signal via the E-Bus.

NOTE: The Excel 10 Controller has limited power available (only 9 mA at 4.8 volts) for checking the digital inputs for contact closures. It is very important that the device used contains high quality, noncorroding contacts with resistivity that does not degrade; that is, increase over time. Use noble metal (such as gold or silver), or pimpled or sealed contacts to assure consistent, long-term operation.

The recommended devices for use with the Excel 10 W7750 Controllers are the EL7628A1007 Ceiling Mounted Infrared or the EL7680A1008 Wall Mounted Wide View Infrared Occupancy Sensors. If ultrasonic sensors are required, the EL7611A1003 and the EL7612A1001 Occupancy Sensors are recommended. An EL76XX Power Supply/Control Unit is required for use with these occupancy sensors. The EL7630A1003 can power up to four sensors, and is multitapped for several line voltages. The EL7621A1002 can power three sensors and it connects to 120 Vac line voltage. The EL7621A1010 can also power three sensors but it connects to 277 Vac line voltage.

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A digital input is also provided for detecting whether a window in the space was opened. The Excel 10 W7750 Controller can be connected to a dry contact (see the following NOTE and Fig. 25 through 32 in Application Step 4. Prepare Wiring Diagrams, for details) or a set of contacts wired in series (for monitoring multiple windows) to verify that the window(s) are closed. The algorithm expects a contact closure to indicate the window is closed. If an open window is detected, the algorithm changes the mode of operation to FREEZE_PROTECT, which shuts down the control functions, and watches for low space temperature conditions. The frost protection setpoint is 46.4° F (8° C), and the frost alarm occurs at 42.8° F (6° C).

NOTE: (This is the same NOTE as in the Occupancy Sensor section.) The Excel 10 has limited power available (only 9 mA at 4.8 volts) for checking the digital inputs for contact closures. It is very important that the device used contains high quality, noncorroding contacts with resistivity that does not degrade; that is, increase over time. Use noble metal (such as gold or silver), or pimpled or sealed contacts to assure consistent, long-term operation.

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As previously discussed, there are four basic varieties of the T7770 Wall Modules and one of the T7780A DDWM (see the Product Names and the Construction sections). Also, a T7770 Wall Modules and T7780A can be shared among two or more W7750s. The control algorithm must be given this wall module information when configuring the W7750 (see Excel E-Vision User’s Guide, form 74-2588).

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The air filter in the air handler can be monitored by the W7750 and an alarm issued when the filter media needs replacement. The two methods of monitoring the filter are:

Connecting a differential pressure switch to a digital input on the W7750A or W7750B.

Wiring a 2-to-10V differential pressure sensor to a voltage input on the W7750B. If the analog input sensor is used, its measured value 0 to 5 inw

(0 to 1.25 kPa) is compared to a user-selectable setpoint (FltrPressStPt— valid range: 0 to 5 inw

(0 to 1.25 kPa)), and the Dirty Filter alarm is issued when the pressure drop across the filter exceeds the setpoint.

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The Excel 10 W7750 Controller provides IAQ ventilation control using one of two different methods of detecting poor air quality. The first is with an IAQ switch device connected to a digital input on the W7750 Controller, where a contact closure indicates poor air quality, and initiates the IAQ Override mode. The device can detect poor air quality using any desired measure such as CO2, VOC, CO, etc. The second method, which is only available on the W7750B, is through an analog input that connects to a CO2 sensor (0 to 10V). The measured value of CO2 from this sensor (0 to 2000 PPM) is compared to the setpoint (IAQSetpt). When the CO2 level is higher than the setpoint, the IAQ Override is initiated.

The effect of initiating the IAQ Override mode is that the economizer dampers are allowed to open above the standard minimum position setting to allow more fresh air to enter the building. See Appendix B— Sequences of Operation, for further control details.

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The Excel 10 W7750 Controller supports smoke-related control strategies that are initiated either via a network command (DestEmergCmd) or from a local (physically connected) smoke detector digital input. The details of the W7750 smoke-related control operation are described in Appendix B— Sequences of Operation.

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The possible modes of operation for the W7750 Controller are listed in Table 5.

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2&&83,('	Controller is in Occupied mode		Any of the following: Network input (SchedOcc) containing a time-of-day
			schedule flag from either the Excel 10 Zone Manager or an E-Bus
			Controller; Time Clock DI, Occupancy Sensor DI; or from Network input
			(ManMode) for manual override to OCC mode. ManMode has the highest
			priority, followed by the Time Clock DI, and then SchedOcc.
67$1'%<	Controller is in Standby mode		Either: (A) Network input (SchedOcc) containing a time-of-day schedule flag
			from the Excel 10 Zone Manager or other E-Bus node is STANDBY, or (B)
			Network input (SchedOcc) is OCCUPIED and the Occupancy Sensor DI is
			UNOCCUPIED.
812&&83,('	Controller is in Unoccupied mode		Network input (SchedOcc) containing a time-of-day schedule flag from the
			Excel 10 Zone Manager or E-Bus, or the network input DestManualOcc has
			a value of UNOCCUPIED.
				FRQWLQXHG

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%<3$66	Controller is in Occupied mode	This mode is derived from the schedule occupancy (SchedOcc) having a
2&&83,('	through a Bypass command	state of UNOCCUPIED and a manual request for occupancy from one of
		three sources. Two of these are signals originated external to the unit, and
		received by DestManualOcc and DestBypass. The third source for an
		occupancy request is from an override button located on a wall module.
		These three sources are arbitrated in a scheme determined by the
		configuration parameter (Network Wins or Last-in Wins from OvrdPriority).
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2&&83,('	Controller occupancy mode was
	overridden to Occupied mode

67$1'%<	Controller occupancy mode was
	overridden to Standby mode
812&&83,('	Controller occupancy mode was
	overridden to Unoccupied mode

%<3$66	Controller occupancy mode was
	overridden to Bypass the current
	Unoccupied mode

127 $66,*1(' No Bypass action

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On power-up, provides a staggered start sequence to evenly apply the load to the electrical system.

The Excel 10 is controlling the Cooling mode.

The Excel 10 is controlling the Heating mode.

Compressors are disabled and only Auxiliary Heat stages are allowed to operate.

The heat/cool control is turned off immediately The node is not running its normal temperature control

The heat/cool control and frost protection are turned off immediately The node is not running its normal temperature control

The node has entered a smoke emergency. The fan and dampers are then set to the conditions configured by SmkCtlMode. The control remains in SMOKE_ EMERGENCY until power is cycled or the node receives DestEmergCmd set to EMERG_NORMAL.

The temperature control is set to HEAT with the setpoint set to the frost limit setpoint 46.4°F (8°C).

Network input (DestManualOcc) containing a time-of-day schedule override signal of OCCUPIED from the Excel 10 Zone Manager or other E-Bus device.

Network input (DestManualOcc) containing a time-of-day schedule override signal of STANDBY from the Excel 10 Zone Manager or other E-Bus device.

Network input (DestManualOcc) containing a time-of-day schedule override signal of UNOCCUPIED from the Excel 10 Zone Manager or other E-Bus device.

DI (Bypass) was pressed, and the Bypass duration timer has not yet expired, or the network input DestManualOcc has a value of BYPASS.

No Override input received.

This mode occurs on controller power-up, and after downloading to the controller from the configuration tool. Temperature control loops are disabled.

Space temperature has risen above the current cooling setpoint, or the network input (DestHvacMode) is COOL.

Space temperature has fallen below the current heating setpoint, or the network input (DestHvacMode) is HEAT.

The network input (DestManHvacMode) is EMERG_HEAT.

Network input (DestManMode) containing AHU operational mode information from C-Bus has value of MORNING WARM-UP.

—

Network input (DestEmergCmd) containing smoke control signal from another E-Bus device has value of SMOKE_EMERG.

The Window digital input detects an open window.

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The physical outputs are being controlled manually. The temperature control loop is turned off.

Control algorithm is disabled, except that the fan is turned on.

Control algorithm is shut off.

Typically this is done by the user through E-Vision or XBS by setting the point DestManMode to MANUAL mode.

The space temperature sensor has failed, or the network input (DestHvacMode) is FAN ONLY.

Network input (ManMode) containing AHU operational mode information from C-Bus has value of DISABLED.

NOTE: During all modes all digital and analog physical inputs are periodically read, the diagnostic output network variables can be polled, the input network variables are received, and the output network variables are sent periodically.

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The seven application steps shown in Table 6 are planning considerations for engineering an Excel 10 W7750 System. These steps are guidelines intended to aid understanding of the product I/O options, bus arrangement choices, configuration options and the Excel 10 W7750 Controller role in the overall EXCEL 5000® OPEN SYSTEM architecture.

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1Plan The System

2Determine Other Bus Devices Required

3Lay Out Communication and Power Wiring

4Prepare Wiring Diagrams

5Order Equipment

6Configure Controllers

7Troubleshooting

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Plan the use of the W7750 Controllers according to the job requirements. Determine the location, functionality and sensor or actuator usage. Verify the sales estimate of the number of W7750 Controllers and T7770 Wall Modules and T7780A DDWMs required for each model type. Also check the number and type of output actuators and other required accessories.

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.

The T7770 Wall Modules can be installed as either hardwired I/O-only devices or additional wiring can be run to them (for the E-Bus network ) to allow a CARE/E-Vision operator terminal to have access to the E-Bus. The application engineer needs to determine how many wall modules, T7770s and T7780s are required. T7780s are

connected to the E-Bus and occupy a node address. All T7780A DDWMs and T7770 Wall Modules, except the T7770A1006 and the T7770A1014, can be connected via the E-Bus network access jack. Also the application engineer needs to know how many T7770s without E-Bus network connections are being installed on the job, and then clearly document which wall modules (if any) have network access. This information is required during installation to ensure that the proper number and type of wires are pulled to the wall modules, and the building operators are informed about where they can plug in to the E-Bus network with a portable operator terminal (see Fig. 17 and 18). Refer to Step 4. Prepare Wiring Diagrams for details, about the about the wiring differences between the two types.

EXCEL 10

W7750

CVAHU

CONTROLLER

NOTEBOOK PC

	SHIELDED
	INTERFACE
	CABLE
RS-232	Q7752A
SERIAL	Q7752A
PORT	SLTA

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PART

NO. 205979

E-BUS

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The FTT communication wiring, (E-Bus) between controllers is a free topology scheme that supports star, loop, and/or bus wiring. Refer to the E-Bus Wiring Guidelines form, 742865 for complete description of network topology rules. See Application Step 3. Lay Out Communications and Power Wiring, for more information on bus wiring layout, and see Fig. 25 through 32 in Application Step 4. Prepare Wiring Diagrams, for wiring details.

The application engineer must review the Direct Digital Control (DDC) job requirements. This includes the Sequences of Operation for the W7750 units, and for the system as a whole. Usually there are variables that must be passed between the W7750 Controllers and other zone controller(s), or central plant controller(s) that are required for optimum system-wide operation. Typical examples are the

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TOD Occ/Unocc signal, the outdoor air temperature, the demand limit control signal, and the smoke control mode signal.

It is important to understand these interrelationships early in the job engineering process to ensure implementing when configuring the controllers. (See Application Step 6. Configure Controllers, for information on the various Excel 10 parameters and on Excel 10 point mapping.)

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A maximum of 62 nodes can communicate on a single E-Bus segment. Each W7750 (CVAHU) Controller or T7780A DDWM constitutes one node. If more nodes are required, a Q7751A,B Router is necessary. Using a router allows up to

125 nodes, divided between two E-Bus segments. The router accounts for two of these nodes (one node on each side of the router); a Q7750A Excel 10 Zone Manager takes one node and two nodes are available for operator terminal nodes, leaving 120 nodes available for Excel 10 Controllers and T7780A DDWMs. All 120 controllers and T7780A DDWMs are able to talk to each other through the router. A Q7750A Excel 10 Zone Manager is required to connect the E-Bus to the standard EXCEL 5000® System C-Bus. Each Excel 10 Zone Manager can support no more than 120 Excel 10 Controllers and T7780A DDWMs. This limit is set in the Excel 10 Zone Manager database as an absolute maximum.

Each E-Bus segment is set up with two unused nodes to allow for a CARE/E-Vision operator terminal to be connected to the E-Bus. Multiple CARE/E-Vision terminals can be connected to the E-Bus at the same time. Table 7 summarizes the E-Bus segment configuration rules.

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One Q7750A Excel 10 Zone Manager

Port for operator terminal access (CARE/E-Vision)

Maximum number of Excel 10s and T7780A DDWMs

Total

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One Q7750A Excel 10 Zone Manager

One Q7751A,B Router

Ports for operator terminal access (two CARE/E-Vision terminals)

Maximum number of Excel 10s and T7780A DDWMs in segment number one

Maximum number of Excel 10s and T7780A DDWMs in segment number two

Total

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1 node

60nodes (T7780A DDWMs are E-Bus nodes)

nodes

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1node

2nodes (1 in each Bus Segment)

60nodes (T7780A DDWMs are E-Bus nodes)

nodes

Refer to the E-Bus Wiring Guidelines form, 74-2865 for complete description of network topology rules and the maximum wire length limitations. If longer runs are required, a Q7740A 2-Way or Q7740B 4-Way Repeater can be added to extend the length of the E-Bus. A Q7751A,B Router can be added to partition the system into two segments and effectively double the length of the E-Bus. Only one router is allowed with each Excel 10 Zone Manager, and each network segment can have a maximum of one repeater.

In addition, all E-Bus segments require the installation of a 209541B Termination Module for a singly terminated E-Bus or two 209541B Termination Modules for a doubly terminated E-Bus. For more details on E-Bus termination, refer to the E- Bus Wiring Guidelines form, 74-2865, or see Application Step 3. Lay Out Communications and Power Wiring, and the E-Bus Termination Module subsection in Application Step 4.

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The communications bus, E-Bus, is a 78-kilobit serial link that uses transformer isolation and differential Manchester encoding. Approved cable types for E-Bus communications wiring is Level IV 22 AWG (0.34 mm2) plenum or non-plenum rated unshielded, twisted pair, solid conductor wire. For nonplenum areas, use Level IV 22 AWG (0.325 mm2), such as US part AK3781 (one pair) or US part AK3782 (two pair). In plenum areas, use plenum-rated Level IV, 22 AWG (0.325 mm2) such as US part AK3791 (one pair) or US part AK3792 (two pair). See Tables 9 and 11 for part numbers. Contact Echelon Corp. Technical Support for the recommended vendors of Echelon approved cables. The FTT communications bus, E-Bus, supports a polarity insensitive, free topology wiring scheme that supports star, loop, and/or bus wiring.

74-2958

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E-Bus networks can be configured in a variety of ways, so refer to the E-Bus Wiring Guidelines form, 74-2865 for complete description of network topology rules and Table 7. Fig. 18 and 19 depict two typical E-Bus network topologies; One has only one doubly terminated E-Bus segment that has 60 nodes or less, and one showing two singly terminated E- Bus segments that has 120 nodes or less (60 MAX per each segment). The bus configuration is set up using the Network Manager tool from within CARE (see the CARE Excel 10 Zone Manager User’s Guide, form 74-1392).

NOTE: For wiring details see the E-Bus Termination Module subsection in Step 4. For wall module wiring, US part AK3782 (non-plenum) or US part AK3792 (plenum) can be used. For an E-Bus that is a doubly terminated daisy-chain, these cables contain two twisted pairs (one for the run down to the wall module, and one for the run back up to the controller) for ease of installation.

	EXCEL 10
	CVAHU
T7770
	209541B
BUS-E	TERMINATION MODULES
BUS-E	E-BUS
	(AT ENDS OF E-BUS DAISY CHAIN)

EXCEL 10

VAV

CVAHU

	EXCEL 10	EXCEL 10
		VAV
	VAV

EXCEL 10			(SHARED)	EXCEL 10
Q7750A			T7780A	CVAHU
ZONE				CVAHU
MANAGER
			UP TO 60
			TOTAL NODES
TO C-BUS		E-BUS
(SEE FIG. 1)
	EXCEL 10	EXCEL 10
	VAV	EXCEL 10
	VAV	VAV
		VAV
		EXCEL 10		EXCEL 10
				EXCEL 10
		CVAHU		CVAHU
				CVAHU
	T7770	T7770	T7770
		T7770

		T7770		JACK FOR
				JACK FOR
				OPERATOR
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		E-BUS SEGMENT NUMBER 1
EXCEL 10		EXCEL 10		EXCEL 10
VAV		EXCEL 10		EXCEL 10
VAV
		CVAHU		CVAHU
		209541B		209541B
T7770		TERMINATION		TERMINATION
T7770		MODULE		MODULE
		MODULE		MODULE
		E-BUS
E-BUS SEGMENT NUMBER 2		ACCESS
	EXCEL 10	EXCEL 10
	VAV	EXCEL 10	Q7751A
	VAV	VAV	Q7751A
		VAV	FTT
			FTT
			E-BUS
			ROUTER

EXCEL 10 Q7750A

ZONE

MANAGER TO C-BUS (SEE FIG. 1)

E-BUS SEGMENT NUMBER 2

EXCEL 10		EXCEL 10
EXCEL 10	EXCEL 10
CVAHU	T7780A	CVAHU
CVAHU	CVAHU
	CVAHU
		M10104A
	E-BUS
	ACCESS

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NOTE: See the E-Bus Termination Module section for wiring details.

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A power budget must be calculated for each Excel 10 W7750 Controller to determine the required transformer size for proper operation. A power budget is simply the summing of the maximum power draw ratings (in VA) of all the devices to be controlled by an Excel 10 W7750 Controller. This includes the controller itself, the equipment actuators (ML6161, or other motors) and various contactors and transducers, as appropriate, for the Excel 10 configuration.

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The following is an example power budget calculation for a typical W7750B Excel 10 W7750 Controller.

Assume a W7750 unit with a fan, two stages of D/X cooling, modulating steam valve for heating, and modulating economizer dampers. The power requirements are:

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Excel 10 W7750	6.0	W7750
Controller		Specification Data
ML6161	2.2	TRADELINE®
Damper Actuator		Catalog
R8242A	21.0	TRADELINE®
Contactor for fan		Catalog in-rush rating
D/X Stages	0.0

NOTE: For this example, assume the cooling stage outputs are wired into a compressor control circuit and, therefore, have no impact on the power budget.)

M6410A Steam	0.7	TRADELINE®
Heating Coil Valve		Catalog, 0.32A at 24 Vac
TOTAL: 29.9		VA

The Excel 10 System example requires 29.9 VA of peak power; therefore, a 40 VA AT72D Transformer is able to provide ample power for this controller and its accessories. Alternatively, a 75 VA AT88A Transformer could be used to power two Excel 10 Systems of this type, or a 100 VA AT92A Transformer could be used to power three of these controllers and meet NEC Class 2 restrictions (no greater than 100 VA). See Fig. 21 and 22 for illustrations of power wiring details. See Table 8 for VA ratings of various devices.

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W7750A,B	Excel 10 W7750 Controller	6.0
T7780A	DDWM	0.8
ML6161A/B	Damper Actuator, 35 lb-in.	2.2
R8242A	Contactor	21.0
M6410A	Valve Actuator	0.7
MMC325	Pneumatic Transducer	5.0
ML684	Versadrive Valve Actuator	12.0
ML6464	Damper Actuator, 66 lb-in.	3.0
ML6474	Damper Actuator, 132 lb-in.	3.0
ML6185	Damper Actuator SR 50 lb-in.	12.0
ML7984B	PWM Valve Actuator	6.0

For contactors and similar devices, the in-rush power ratings should be used as the worst case values when performing power budget calculations. Also, the application engineer must consider the possible combinations of simultaneously energized outputs and calculate the VA ratings accordingly. The worst case, that uses the largest possible VA load, should be determined when sizing the transformer.

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Excel 10 Controllers must receive a minimum supply voltage of 20 Vac. If long power or output wire runs are required, a voltage drop due to Ohms Law (I x R) line loss must be considered. This line loss can result in a significant increase in total power required and thereby affect transformer sizing. The following example is an I x R line-loss calculation for a 200 ft (61m) run from the transformer to a W7750 Controller drawing 37 VA using two 18 AWG (1.0 mm2) wires.

The formula is:

Loss = [length of round-trip wire run (ft)] x [resistance in wire (ohms per ft)] x [current in wire (amperes)]

From specification data:

18 AWG twisted pair wire has 6.38 ohms per 1000 feet. Loss = [(400 ft) x (6.38/1000 ohms per ft)] x

[(37 VA)/(24V)] = 4.0 volts

This means that four volts are going to be lost between the transformer and the controller; therefore, to assure the controller receives at least 20 volts, the transformer must output more than 24 volts. Because all transformer output voltage levels depend on the size of the connected load, a larger transformer outputs a higher voltage than a smaller one for a given load. Fig. 20 shows this voltage load dependence.

In the preceding I x R loss example, even though the controller load is only 37 VA, a standard 40 VA transformer is not sufficient due to the line loss. From Fig. 20, a 40 VA transformer is just under 100 percent loaded (for the 37 VA controller) and, therefore, has a secondary voltage of 22.9 volts. (Use the lower edge of the shaded zone in Fig. 20 that represents the worst case conditions.) When the I x R loss of four volts is subtracted, only 18.9 volts reaches the controller, which is not enough voltage for proper operation.

In this situation, the engineer basically has three alternatives:

Use a larger transformer; for example, if an 80 VA model is used, see Fig. 20, an output of 24.4 volts minus the four volt line loss supplies 20.4V to the controller. Although acceptable, the four-volt line-loss

in this example is higher than recommended. See the following ,03257$17.

Use heavier gauge wire for the power run. 14 AWG (2.0 mm2) wire has a resistance of 2.57 ohms per 1000 ft which, using the preceding formula, gives a line-loss of only 1.58 volts (compared with 4.02 volts). This

would allow a 40 VA transformer to be used. 14 AWG (2.0 mm2) wire is the recommended wire size for 24 Vac wiring.

Locate the transformer closer to the controller, thereby reducing the length of the wire run, and the line loss.

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The issue of line-loss is also important in the case of the output wiring connected to the Triac digital outputs. The same formula and method are used. The rule to remember is to keep all power and output wire runs as short as practical. When necessary, use heavier gauge wire, a bigger transformer, or install the transformer closer to the controller.

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To meet the National Electrical Manufacturers Association (NEMA) standards, a transformer must stay within the NEMA limits. The chart in Fig. 20 shows the required limits at various loads.

With 100 percent load, the transformer secondary must supply between 23 and 25 volts to meet the NEMA standard. When a purchased transformer meets the NEMA standard DC20-1986, the transformer voltage-regulating ability can be considered reliable. Compliance with the NEMA standard is voluntary.

The following Honeywell transformers meet this NEMA

standard:
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		AT20A	20
		AT40A	40
		AT72D	40
		AT87A	50
AK3310 Assembly			100
	27
	27
	26
	26
	25
	25
VOLTAGE	24
	24
	23
	23
	22
	22
	21
SECONDARY	21
	20
	20
	19
	19
	18
	18
	17


	16
	16
	15
	15
	14
	14

0 50 100 150 200

% OF LOAD

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Attach earth ground to W7750 Controller terminal 1. See Fig. 21, 22 and 23, 25 through 32.

	OUTPUT
	DEVICE
	POWER
TRANSFORMER		TRIAC LINES
		TRIAC LINES
		TO ACTUATORS
		TO ACTUATORS
		AND CONTACTORS

CONNECT POWER TO TERMINALS 24 AND 25

W7750B
2524	22	20
1

EARTH	M10089A
GROUND

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See Fig. 22. for wiring more than one Excel 10 per transformer.

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