Honeywell W7750A Digital Inputs, Triac Outputs on the W7750B,C Models only, Digital Outputs

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER

Outdoor Air Humidity (W7750B,C only):

Type: Voltage/Current.

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

Return Air Humidity (W7750B,C only):

Type: Voltage/Current.

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

Outdoor Air Enthalpy (W7750B,C only):

Type: Current.

Supported Sensors: C7400A1004 (4 to 20mA).

Return Air Enthalpy (W7750B,C only):

Type: Current.

Supported Sensors: C7400A1004 (4 to 20mA).

Air Filter Differential Pressure (W7750B,C only):

Type: Voltage.

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

CO2 Sensor (W7750B,C only):

Type: Voltage.

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

Monitor Sensor for network use (W7750B,C only): Type: Voltage.

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

DIGITAL INPUTS:

NOTE: Only one of each type of input is allowed. For example, only one Smoke Monitor is allowed. No duplicate Smoke Monitors are usable on the same controller.

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,C:

—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

—Coil Freeze Stat: (Only use this DI when using E-Vision.) Contact Closed = Coil Freeze condition sensed

—Wall Module Bypass Pushbutton:

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

TRIAC OUTPUTS ON THE (W7750B,C MODELS ONLY):

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

CAUTION

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

NOTE: Triacs sink current to the 24 Vac common (COM terminal on the W7750B,C Models); see Fig. 30 for wiring example.

IMPORTANT

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

DIGITAL OUTPUTS:

COOL STAGE 1

COOL STAGE 2

COOL STAGE 3

COOL STAGE 4

HEAT STAGE 1

HEAT STAGE 2

HEAT STAGE 3

HEAT STAGE 4 CHANGE OVER RELAY FAN

AUX ECON OCCUPANCY STATUS ECON OPEN

ECON CLOSE

COOL OPEN

COOL CLOSE

HEAT OPEN

HEAT CLOSE

HEAT COOL STAGE 1

HEAT COOL STAGE 2

HEAT COOL STAGE 3

HEAT COOL STAGE 4

FREE1 (NOTE: Free1, Free1 Pulse On and Free1 Pulse Off are three separate and unique digital output points. Because they are not related, they all can be configured in a CVAHU controller at the same time.)

FREE2

FREE1 PULSE ON

FREE1 PULSE OFF ECON PWM HEAT PWM COOL PWM UNUSED

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