Honeywell W7750A User Manual
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
51
74-2958—1
Fig. 42. LED location on W7750.
T7770C,D Wall Module Bypass Pushbutton and
Override LED
Override LED
Pressing the bypass pushbutton, located on the T7770C,D
Wall Modules in Fig. 43, causes the override LED to display
the Manual Override mode of the controller. The modes are:
Wall Modules in Fig. 43, causes the override LED to display
the Manual Override mode of the controller. The modes are:
Fig. 43. The T7770C,D Wall Modules LED and Bypass
pushbutton locations.
1.
LED = Off. No override active.
2.
LED = Continuously on. Bypass mode (timed Occupied
override).
override).
3.
LED = One flash per second. Continuous Unoccupied
override.
override.
4.
LED = Two flashes per second. Remote only, continu-
ous Occupied override.
ous Occupied override.
T7560A,B Digital Wall Module Bypass Pushbutton
and LCD Display Occupancy Symbols
and LCD Display Occupancy Symbols
See Fig. 44 for the T7560A,B Digital Wall Module bypass
pushbutton location.
pushbutton location.
Press and release the bypass pushbutton, located on the
T7560A,B Digital Wall Modules in Fig. 44 for more than one
second to cause the sun symbol on the bottom right side of
the LCD display to appear. Pressing the bypass pushbutton
for more than four seconds causes the controller, hard-wired
to the T7560A,B, to go into continuous unoccupied override.
The T7560A,B displays the moon symbol.
T7560A,B Digital Wall Modules in Fig. 44 for more than one
second to cause the sun symbol on the bottom right side of
the LCD display to appear. Pressing the bypass pushbutton
for more than four seconds causes the controller, hard-wired
to the T7560A,B, to go into continuous unoccupied override.
The T7560A,B displays the moon symbol.
Fig. 44. The T7560A,B Digital Wall Module Bypass
pushbutton location.
APPENDICES
Appendix A. Using E-Vision to Commission a
W7750 Controller.
W7750 Controller.
NOTE:
When commissioning a CVAHU W7750 Controller,
E-Vision first checks that the actual hardware model
(such as W7750A,B,C) is the same type which was
selected from the Application Selection/Output tab. If
the types do not match, the download does not occur
and the user-entered values in the Application
Selection screens all revert back to default values.
E-Vision first checks that the actual hardware model
(such as W7750A,B,C) is the same type which was
selected from the Application Selection/Output tab. If
the types do not match, the download does not occur
and the user-entered values in the Application
Selection screens all revert back to default values.
Sensor Calibration
The space temperature, the optional resistive and voltage/
current (W7750B,C only) inputs can all be calibrated. The wall
module setpoint potentiometer can not be calibrated.
current (W7750B,C only) inputs can all be calibrated. The wall
module setpoint potentiometer can not be calibrated.
Perform the sensor calibration by adding an offset value
(either positive or negative) to the sensed value using
E-Vision menus (see E-Vision user guide, form number
74-2588).
(either positive or negative) to the sensed value using
E-Vision menus (see E-Vision user guide, form number
74-2588).
When calibrating voltage/current sensors on the (W7750B,C),
the offset amount entered by the user is in volts, regardless of
the inputs actual engineering units. See Appendix E for
information on how to derive the proper voltage value to enter
as an offset during calibration.
the offset amount entered by the user is in volts, regardless of
the inputs actual engineering units. See Appendix E for
information on how to derive the proper voltage value to enter
as an offset during calibration.
Setting the Pid Parameters
The W7750 is designed to control a wide variety of
mechanical systems in many types of buildings. With this
flexibility, it is necessary to verify the stability of the
temperature control in each different type of application.
mechanical systems in many types of buildings. With this
flexibility, it is necessary to verify the stability of the
temperature control in each different type of application.
M10095A
W7750
1
2
3
4
5
6
7
8
9
10
11 12 13 14 15
J3
31
30
29
28 27 26 25
24 23 22 21
20
19 18 17 16
E
GND
LED
BYPASS SNSR
SET PT
AI-1
OHM
OHM
A1-2
OHM
OHM
AI-3
V/mA
AI-4
V/mA
20VDC
OUT
DI-4
DI-3
DI-2
DI-1
VAC
24
VAC
24
COM
1
OUT
2
OUT
3
OUT
4
OUT
5
OUT
6
OUT
7
OUT
8
OUT
AI
GND
AI
GND
AI
GND
LONWORKS
-BUS
LON
JACK
DI
GND
DI
GND
STATUS
LED
LED
M11617
T7770C
T7770D
OVERRIDE
LED
LED
BYPASS
PUSHBUTTON
PUSHBUTTON
BYPASS
PUSHBUTTON
PUSHBUTTON
70
65
60
55
75
80
85
OVERRIDE
LED
LED
M17500
BYPASS
PUSHBUTTON
PUSHBUTTON