Excel 10 W7750A, B Constant Volume AHU Controller. CSI 3-Part Specifications.



	Excel 10 W7750A,B Constant Volume AHU Controller
SPECIFICATION DATA

GENERAL
The W7750A,B 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.

FEATURES

Controls single zone and heat pump Air Handling Unit.
Uses Echelon^® LonWorks^® network (E-Bus) communications protocol.
High-speed 78 kilobit communications network.
Conforms with Echelon^® LonMark^® HVAC Interoperability standard for Roof Top Unit controllers (profile number 8030).
Free Topology Transceiver (FTT) network technology is insensitive to polarity, simplifying installation.
Capable of stand-alone operation and has enhanced features available when using the E-Bus network communications.
120 controllers per Q7750A Excel 10 Zone Manager.
Designed for both staged heating/cooling control and modulating heating/cooling control.
Uses either Series 60 Floating Control (W7750A and B) or PWM (W7750B only) providing modulating control for heating/cooling equipment.
Supports two types of economizer control, modulating control and enable/disable control.
Provides Proportional Integral Derivative (PID) temperature control.
Uses an adaptive algorithm (patent pending) that continuously adjusts the discharge air setpoint as needed.
Factory configured via EEPROM with critical user parameter default values.
Motion sensor interface for enhanced energy savings.
Window sensor input for additional energy savings.

DESCRIPTION
The W7750A,B 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.

Control Techniques Supported (Heating and Cooling):

Output capacity:

W7750A� Six digital outputs
W7750B� Eight digital outputs

� Heat pump control: Up to four compressors and up to four stages of auxiliary heat.
� Up to four stages of electric or gas fired heating.
� Up to four stages of mechanical cooling.
� Floating hot water or steam heat.
� Pulse width modulated heat (W7750B only).
� Floating chilled water cooling.
� Pulse width modulating cooling (W7750B only).
� Floating mixed air damper output.
� Pulse width modulating mixed air damper output, (W7750B only).
� Occupancy sensor override and window open override.

SPECIFICATIONS

Models: W7750A,B
The W7750 is field mounted at or near the Air Handling Unit or Heat Pump. The W7750 can also be mounted using DIN rail and two each 2TK2D Augat DIN rail adapters (purchase locally). Field wiring 14 to 22 AWG (2.0 to 0.34 mm² ) attachs to screw terminals. To access the network for E-Bus communications an operator plugs into the E-Bus jack with an E-Bus Serial Interface Cable.

Inputs/Outputs:

The W7750A Unit supports the following hardware features:

Three 20 Kohm NTC (10,000 through 80,000 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 (only 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 (10,000 through 80,000 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 4 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 (only 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.

Analog Inputs:

Space Temperature:

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

Discharge Air Temperature:

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.

Outdoor Air Temperature:

Type: RTD.
Supported Sensors: C7170A1002.

Return Air Temperature:

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

Outdoor Air Humidity (W7750B only):

Type: Voltage/Current.
Supported Sensors: C7600B1000 and C7600B1018 (2 to 10V), C7600C1008 (4 to 20mA).

Return Air Humidity (W7750B only):

Type: Voltage/Current.
Supported Sensors: C7600B1000 and C7600B1018 (2 to 10V), C7600C1008 (4 to 20mA).

Outdoor Air Enthalpy (W7750B only):

Type: Current.
Supported Sensors: C7400A1004 (4 to 20mA).

Return Air Enthalpy (W7750B only):

Type: Current.
Supported Sensors: C7400A1004 (4 to 20mA).

Air Filter Differential Pressure (W7750B only):

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

CO₂ Sensor (W7750B only):

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

Monitor Sensor for network use (W7750B only):

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

Digital Inputs:
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�System Engineering Form, 74-2958.)

Triac Outputs (W7750B only):

Triac Outputs on the W7750B Model:
� Power ratings: 20 Vac to 30 Vac at 25 mA MIN to 500 mA MAX current for any voltage.

Power Supply Requirements
24 Vac with a valid range of 20 to 30 Vac at 50/60 Hz. Controller uses 6 VA maximum at both 50 and 60 Hz.

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

Memory Capacity
The W7750A,B Controller uses a 64K ROM/PROM (16K reserved for network operations, 48K usable for control algorithm code).

512 bytes EEPROM
2K RAM

Specified Space Temperature Sensing Range
45° to 99°F (7° to 37°C) with an allowable control setpoint range from 50° to 90°F (10° to 32°C) when initiated from the network and 55° to 85°F (13° to 29°C) when configured and connected to a T7770 Wall Module or a T7780A Digital Display Wall Module (DDWM).

Communications
The W7750A,B Controller uses a Free Topology Tranceiver (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 assuring dc isolation. The E-Bus is insensitive to polarity, eliminating installation errors due to miswiring.

The maximum E-Bus network length is 5000 ft (1524m). With the addition of a Q7751A Router, the maximum length of the E-Bus network can increase to 10,000 ft (3048m).

The maximum number of nodes per E-Bus segment is 60.

The maximum number of nodes per Q7750A Zone Manager FTT network is 120.

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 (0.34mm² ) such as US part AK3791 (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). Additionally, Echelon^® approved cable can be used. Contact Echelon^® Corp. Technical Support for the recommended vendors of Echelon^® approved cables.

LonMark^® Functional Profile
W7750 Controllers support the LonMark^® Functional Profile number 8030 Roof Top Unit Controller, version 1.0 (see Fig. 1).

Fig. 1. Functional profile of LonMark^® RTU object details.

Dimensions (H/W/D):
W7750A,B: 5-5/8 x 6 x 2-1/8 in. (143 x 152 x 54 mm).

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

Relative Humidity:
5% to 95% noncondensing.

Vibration:
V2 level compliant.

Corrosion:
The W7750 is not sealed against corrisive vapors or compounds.

Approval Bodies:
� The W7750A,B is listed under UL 916 (E87741) and is also listed under cUL (E87741).
� The W7750 meets FCC part 15 Class B requirements.
� The W7750 conforms to requirements per European Consortium standards EN50081-1 (CISPR 22 Class B) and EN 50082-1 (IEC 801-2, IEC 801-3 and IEC 801-4) for CE mark labeling.

Accessories:
� Excel 10 T7770A,B,C,D Wall Modules.
� Excel 10 T7780A Digital Display Wall Module.
� Excel 10 C7770A Air Temperature Sensor.
� Excel 10 Q7750A FTT Zone Manager.
� Excel 10 Q7751A,B Router.
� Excel 10 Q7752A Serial Interface.
� Excel 10 Connector Cable 205979 from the Excel 10 Q7752A Serial Interface to an Excel 10 Controller or Wall Module.
� Excel 10 Q7740A,B FTT Repeaters
� 209541B FTT Termination Module



Helping You Control Your World^®
Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis, MN 55408-0524	Home and Building Control Honeywell Limited - Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 3N7	Honeywell Asia Pacific Inc. Room 3213-3225 Sun Hung Kai Centre No. 30 Harbour Road Wanchai Hong Kong
Honeywell Latin American Division 480 Sawgrass Corporate Parkway Suite 200 Sunrise, FL 33325	Honeywell Europe 3 Avenue du Bourget 1140 Brussels Belgium	Home and Building Control Products Honeywell AG Böblinger Straße 17 D-71101 Schönaich Phone (49-7031) 637-01 Fax (49-7031) 637-493

Subject to change without notice.

74-2956 J.D 6-97