Honeywell W7750A User Manual
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
37
74-2958—1
Table 10. W7750A Version I/O Description.
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 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 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 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
(OUT 6) DO6—HEAT_STAGE_1
DO7—UNUSED
DO8—UNUSED
The Wall Module terminals are identical for the W7750A,B,C
Models.
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.
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).
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).
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 (L
ON
W
ORKS
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