Honeywell W7750A Terminal Terminal Number Description, Factory Default Digital Outputs

		EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
		Table 10. W7750A Version I/O Description.
Terminal	Terminal Number	Description
DO6–(W1)	31	Heat 1 (or Reversing Valve for a Heat Pump)
DO5–(W2)	30	Heat 2 (or Aux. Heat for a Heat Pump)
DO4–(Y1)	29	Cool 1 (or Compressor 1 for a Heat Pump)
DO3–(Y2)	28	Cool 2 (or Compressor 2 for a Heat Pump)
DO2–(G)	27	Fan
DO1–NET	26	Network Digital Output
DO1–NET	25	Network Digital Output (connect to terminal number 22 +24Vac)
Rc	24	Control power for relay contacts DO2 (G), DO3 (Y1) and DO4 (Y2)
Rh	23	Control power for relay contacts DO5 (W1) and DO6 (W2)
+24Vac (H)	22	Power for the controller
COM (N)	21	Return for power to controller
E-Bus	14 and 15	Echelon communications (LONWORKS Bus) screw terminals
DI - 2	12	Digital Input 2
DGND	11	Digital Ground
DGND	10	Digital Ground
DI - 1	9	Digital Input 1
AGND	8	Analog ground
AI - 1 OHM	7	Analog Input 1 (used for Discharge Air Temperature Sensor)
SET PT	6	Space temperature setpoint potentiometer
GROUND	5	Wall Module
SENSOR	4	Space temperature sensor
BYPASS	3	Space override button
LED	2	Space LED for indication of manual occupancy status
EARTH GND	1	Earth Ground

IMPORTANT

If the W7750A controller is configured by E-Vision, the outputs may be assigned in different order than the factory defaults. Use the Custom Wiring function of E-Vision to re-assign the outputs to the desired terminals.

The W7750B,C Versions are preconfigured with the same factory default setup as the W7750A Model; however, some terminals for wiring connections differ on the W7750B,C Models. See Fig. 30 for the terminal names on the W7750B Model and Fig. 35 for the terminal names on the W7750C Model. The factory default configuration of the digital output points on the W7750B,C Models follow (terminal names are from the W7750A):

FACTORY DEFAULT DIGITAL OUTPUTS:

FREE 1 (OUT 1) DO1— NETWORK DO (OUT 2) DO2— SUPPLY FAN START/STOP

(OUT 3) DO3— COOL_STAGE_2

(OUT 4) DO4— COOL_STAGE_1

(OUT 5) DO5— HEAT_STAGE_2

(OUT 6) DO6— HEAT_STAGE_1 DO7— UNUSED

DO8— UNUSED

The Wall Module terminals are identical for the W7750A,B,C Models.

The W7750B,C Models offers two voltage/current sensor input terminals. When current-type sensors (4 to 20 mA) are configured, the W7750B,C automatically switches a 249 ohm resistor into the sensing circuit; so no external resistor is required. The W7750A Model does not support voltage or current inputs.

NOTE: If using factory defaults, DI-2 input is configured for ScheduleMaster (nvoIO.SchedMaster). For a stand-alone unit, either connect an external time clock to terminals 9 and 10 or put a jumper on terminals 9 and 10 (using a jumper puts the controller in continuous occupied mode).

37 74-2958— 1