Honeywell Ventilation Hood W7753A User Manual
Excel 10  
W7753A Unit Ventilator Controller  
INSTALLATION INSTRUCTIONS  
The W7753A Controller communicates via the 78 kilobaud  
PRODUCT DESCRIPTION  
Echelon® LonWorks® E-Bus Network.  
The W7753A Unit Ventilator Controller is a Free Topology  
Transceiver (FTT) LONMARK® Compliant Unit Vent controller  
in the Excel 10 family product line.  
Allowable input/output connections consist of wall module  
points plus two additional resistive sensor inputs, two voltage/  
current inputs, four digital inputs and eight digital Triac  
outputs.  
This controller can be used to monitor/control HVAC  
equipment, lighting, and other miscellaneous loads in a  
distributed network. The controller is field-mounted to the  
equipment that it controls, and the controller wiring is attached  
to the screw terminals located on the controller (see Fig. 1).  
For the W7753A, any hardware driven by the Triac outputs  
must have a minimum current draw, when energized, of  
25 mA and a maximum current draw of 500 mA.  
31  
30  
29  
28  
27  
26  
25  
24  
24  
24  
23  
22  
2
OUT  
21  
3
OUT  
20  
19  
5
OUT  
DI-4  
18  
6
OUT  
GND  
17  
16  
DI-3  
DI-2  
1
OUT  
GND  
VA  
C
DI-1  
4
OUT  
VA  
C
COM  
7
8
OUT  
OUT  
E
LED  
2
BYP  
ASS  
SNSR  
GND  
5
GND  
SET  
PT  
AI-1  
GND  
8
A1-2  
AI-3  
GND  
11  
OHM  
AI-4  
V/mA 22VDC  
OHM  
1
E-BUS  
14  
V/mA  
3
E-BUS  
JACK  
4
OUT  
6
7
9
10  
1
2
13  
15  
J3  
M12688  
Fig. 1. Excel 10 W7753A Unit Ventilator Controller.  
95-7520—02  
 
EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
Power  
The 24 Vac power from an energy-limited Class II Power  
Source must be provided to each W7753A Controller. To  
conform to Class II restrictions (U.S. only), transformers must  
not be larger than 100 VA.  
2
A transformer that meets CE mark requirements and that  
meets the Low Voltage Directive (LVD) requirements must be  
used in Europe for all installations of this product. More than  
one W7753A Controller can be powered by a single  
transformer. Fig. 4 shows power wiring details for a single  
controller and Fig. 5 depicts multiple controllers using one  
transformer.  
3
IMPORTANT  
Use the heaviest gauge wire available, up to 14  
AWG (2.0 mm2) with a minimum of 18 AWG  
(1.0 mm2), for all power and earth ground wiring.  
Screw type terminal blocks are designed to accept  
up to two 14 AWG (2.0 mm2) conductors, one on  
each side of the terminal screw. More than two wires  
that are 14 AWG (2.0 mm2) can be connected with a  
wire nut. Include a pigtail with this wire group and  
attach the pigtail to one side of the terminal block.  
1
M6857  
Fig. 3. W7753A DIN rail mounting.  
OUTPUT  
DEVICE  
POWER  
Wiring  
TRANSFORMER  
TRIAC LINES  
All wiring must comply with applicable electrical codes and  
ordinances or as specified on installation wiring diagrams.  
Controller wiring on the W7753A is terminated to the screw  
terminal blocks located on the top and the bottom of the  
controller.  
TO ACTUATORS  
AND  
CONTACTORS  
W7753A  
CONNECT POWER TO  
TERMINALS 24 AND 25  
2524 22 20  
NOTES:  
—
For multiple controllers operating from a single  
transformer, the same side of the transformer  
secondary must be connected to the same power  
input terminal in each controller. The ground  
terminal (1 on the W7753A) must be connected to  
a verified earth ground for each controller in the  
group (see Fig. 5). (Controller configurations are  
not necessarily limited to three controllers, but the  
total power draw including accessories cannot  
exceed 100 VA when powered by the same  
transformer (U.S. only). See System Engineering  
form 74-2964 for power wiring recommendations.)  
All loads on an Excel 10 W7753A Controller must  
be powered by the same transformer that powers  
the Excel 10 W7753A Controller. A W7753A  
Controller can use separate transformers for  
controller power and load power.  
Keep the earth ground connection (terminal 1)  
wire run as short as possible. Refer to Fig. 9  
through 14.  
Do not connect the analog or digital ground  
terminals (5, 8, 11, 27 and 30) to earth ground.  
Refer to Fig. 9 through 14.  
1
EARTH  
GROUND  
M12681  
Fig. 4. Power wiring details; one Excel 10 per transformer.  
—
NOTES:  
—
Unswitched 24 Vac power wiring can be run in the  
same conduit as the E-Bus cable.  
Maintain at least three-inch (76 mm) separation  
between Triac outputs and E-Bus wiring  
throughout the installation.  
—
—
—
See the following IMPORTANT on Heating and Cooling  
Equipment (UL 1995, U.S. only).  
IMPORTANT  
If the W7753A Controller is used on Heating and  
Cooling Equipment (UL 1995, U.S. only) and the  
transformer primary power is more than 150 volts,  
connect the transformer secondary to earth ground  
(see Fig. 6). For these applications, only one  
W7753A Excel 10 controller can be powered by each  
transformer.  
3
95-7520—02  
 
EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
24 VAC  
120/240 VAC  
TRANSFORMER  
W7753A  
W7753A  
W7753A  
2524  
2524  
2524  
1
1
1
EARTH  
GROUND  
EARTH  
GROUND  
EARTH  
GROUND  
M12682  
Fig. 5. Power wiring details for two or more Excel 10s per transformer.  
NOTES: (For Communications Wiring)  
—
All field wiring must conform to local codes and  
ordinances (or as specified on the installation  
drawings).  
24 VAC  
LINE VOLTAGE  
GREATER  
THAN 150 VAC  
—
Approved cable types for E-Bus communications  
wiring is Level IV 22 AWG (0.34 mm ) plenum  
TRANSFORMER  
W7753A  
2
and non-plenum rated unshielded, twisted pair,  
solid conductor wires. For nonplenum areas, U.S.  
part AK3781 (one pair) or U.S. part AK3782 (two  
pair) can be used. In plenum areas, U.S. part  
AK3791 (one pair) or U.S. part AK3792 (two pair)  
can be used.  
Unswitched 24 Vac power wiring can be run in the  
same conduit as the E-Bus cable.  
Do not bundle output wires with sensor, digital  
1
EARTH  
GROUND  
—
—
—
1
input or communications E-Bus wires.  
Do not use different wire types or gauges on the  
same E-Bus segment. The step change in line  
impedance characteristics would cause unpre-  
dictable reflections on the E-Bus. When using dif-  
ferent types is unavoidable, use a Q7751A Router  
at the junction.  
In noisy (high EMI) environments, avoid wire runs  
parallel to noisy power cables, motor control cen-  
ters, or lines containing lighting dimmer switches,  
and keep at least 3 in. (76 mm) of separation  
between noisy lines and the E-Bus cable.  
Each daisy-chained E-Bus segment that is on one  
side of a Q7751A,B Router (can contain up to 60  
Excel 10s) and has a length greater than 1640 ft.  
(500m) must have two E-Bus 209541B  
Termination Modules, one at each end of the  
daisy-chain wiring run.  
EARTH  
GROUND  
IF THE W7750 CONTROLLER IS USED IN UL 1995 EQUIPMENT AND THE  
PRIMARY POWER IS MORE THAN 150 VOLTS, GROUND ONE SIDE OF  
TRANSFORMER SECONDARY.  
1
M12680  
Fig. 6. Transformer power wiring details for one Excel 10  
used in UL 1995 equipment (U.S. only).  
—
—
Communications  
Refer to E-Bus Wiring Guidelines, form 74-2865, for a  
complete description of E-Bus network topology rules.  
Approved cable types for E-Bus communications wiring are  
2
Level IV 22 AWG (0.34 mm ) plenum and non-plenum rated  
unshielded, twisted pair, solid conductor wire. For nonplenum  
areas, U.S. part AK3781 (one pair) or U.S. part AK3782 (two  
pair) can be used. In plenum areas, U.S. part AK3791 (one  
pair) or U.S. part AK3792 (two pair) can be used.  
Communications wiring can be run in a conduit, if needed,  
with non-switched 24 Vac or sensor wiring. If a longer E-Bus  
network is required, a Q7740A 2-way or Q7740B 4-way  
repeater can be added to extend the length of the E-Bus. Also  
a Q7751A Router can be added to partition the system into  
two segments and effectively double the length of the E-Bus.  
Only one router is allowed with each Excel 10 Zone Manager,  
and each network segment can have a maximum of one  
repeater.  
—
Make sure that neither of the E-Bus wires is  
grounded.  
NOTE: If a 209541B Termination Module is required at a the  
UV controller, connect two of the three termination  
module wires to the E-Bus terminals. Selecting the  
appropriate two wires depends on the E-Bus network  
topology. Refer to the E-Bus Wiring Guidelines, form  
74-2865, and the Excel 10 FTT Termination Module  
Installation Instructions, form 95-7554. For example,  
using a doubly terminated daisy-chained bus topol-  
ogy, if controllers are on either end of an E-Bus wire  
run, mount the termination module on the appropri-  
ate terminals as shown in Fig. 7.  
Pull the cable to each device on the E-Bus and connect to  
communication terminals 14 and 15 (W7753A).  
95-7520—02  
4
 
EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
W7753A  
W7753A  
W7753A  
1415  
1415  
1415  
ORANGE  
BROWN  
BROWN  
PART NO. 209541B  
TERMINATION  
MODULE  
PART NO. 209541B  
TERMINATION  
MODULE  
ORANGE  
M12690  
Fig. 7. Termination modules (place a wire nut on each remaining wire that is not connected to a controller or device).  
NOTE: When two or more wires are to be attached to the same terminal, other than 14 AWG (2.0 mm2), be sure to twist them  
together. Deviation from this rule can result in improper electrical contact. See Fig. 8.  
Wire to the terminal blocks as follows:  
1. Strip 3/8 in. (10 mm) insulation from the conductor.  
2. Insert the wire in the required terminal location and  
tighten the screw to complete the termination.  
3. If two or more wires are being inserted into one terminal  
Wiring Details  
The W7753A Controller has the terminal arrangements shown  
in Fig. 9 through 14. Connection for operator access to the  
E-Bus is provided by plugging the Serial LonTalk® Adapter  
(SLTA) connector into the E-Bus jack.  
location, strip 1/2 in. (13 mm) of insulation from the con-  
ductors then twist the wires together a minimum of three  
turns before inserting them.  
4. Cut the twisted end of the wires to 3/16 in. (5 mm)  
before inserting them into the terminal and tightening  
the screw.  
5. Pull on each wire in all terminals to check for good  
mechanical connection.  
NOTE: If an Excel 10 Controller or Zone Manager is not  
connected to a good earth ground, the controller  
internal transient protection circuitry is compromised  
and the function of protecting the controller from  
noise and power line spikes cannot be fulfilled. This  
can result in a damaged circuit board and require  
replacement of the controller. Refer to job drawings  
for specific installation wiring diagrams.  
TWO 14 AWG  
(2.0 MM2) WIRES  
3/8  
(10)  
1. STRIP 3/8 IN. (10 MM) FROM WIRES  
TO BE ATTACHED AT ONE TERMINAL.  
2. TWIST WIRES TOGETHER  
WITH PLIERS (A MINIMUM  
OF THREE TURNS).  
3. CUT TWISTED END OF WIRES TO 3/16 IN. (5 MM)  
BEFORE INSERTING INTO TERMINAL AND TIGHTENING  
SCREW. THEN PULL ON EACH WIRE IN ALL TERMINALS  
TO CHECK FOR GOOD MECHANICAL CONNECTION.  
M10086  
Fig. 8. Attaching two or more wires at terminal blocks.  
5
95-7520—02  
 
EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
WINDOW CONTACT  
(CONTACT CLOSED =  
WINDOWCLOSED)  
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16  
3
OCCUPANCY SENSOR  
(CONTACT CLOSED =  
OCCUPIED)  
+
-
24 VAC  
3
TRIAC EQUIVALENT CIRCUIT  
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16  
W7753A  
UNIT  
VENTILATOR  
CONTROLLER  
E-BUS  
TRIAC EQUIVALENT CIRCUIT  
W7753A  
1
2
4
5
6
7
8
9
10 11 12 13 14 15 J3  
3
UNIT  
VENTILATOR  
CONTROLLER  
E-BUS  
E-BUS  
1
2
3
4
5
6
7
8
9 10  
OUTSIDE  
AIR CO  
SENSOR  
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 J3  
2
TR23-F5  
WALL MODULE  
1
M29164  
E-BUS  
Fig. 9. Typical W7753A unit ventilator application wiring  
diagram with T7770F wall module. (For note 2, refer to  
Fig. 8.)  
1
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM.  
USE THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.O MM2)  
WITH A MINIMUM OF 18 AWG (1.O MM2), FOR EARTH GROUND WIRE.  
2
3
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED  
TOGETHER BEFORE INSERTION INTO THE TERMINAL BLOCK.  
CONTACTS MUST BE SUITABLE FOR DRY SWITCHING, 5V AT 10 mA. USE  
SEALED TYPE, GOLD FLASHED OR PIMPLED CONTACTS.  
M12692  
Fig. 10. Typical window and occupancy sensor wiring  
diagram. (For note 2, refer to Fig. 8.)  
95-7520—02  
6
 
EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16  
MMC325 PNEUMATIC  
TRANSDUCER  
M
M
3
B
W7753A  
TRIAC EQUIVALENT CIRCUIT  
UNIT  
VENTILATOR  
CONTROLLER  
PNEUMATIC  
VALVE  
1
2
+
E-BUS  
24 VAC  
-
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16  
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 J3  
2
1
+
S
C7600C  
E-BUS  
+
S
HUMIDITY  
(4 TO 20mA)  
C7600C  
W7753A UNIT  
VENTILATOR  
CONTROLLER  
ENTHALPY  
(4 TO 20mA)  
1
2
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE  
THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.O MM2) WITH  
A MINIMUM OF 18 AWG (1.O MM2), FOR EARTH GROUND WIRE.  
1
MAKE SURE ALL TRANSFORMER/POWER WIRING IS AS SHOWN;  
REVERSING TERMINATIONS RESULTS IN EQUIPMENT  
MALFUNCTION.  
TO ASSURE PROPER ELECTRICAL CONTACT, WIRESMUST BE TWISTED  
TOGETHER BEFORE INSERTIONINTO THE TERMINAL BLOCK.  
M12695  
2
3
OPTIONAL 24 VAC WIRING TO NEXT CONTROLLER.  
Fig. 12. Typical 4 to 20 mA Humidity and Enthalpy Sensor  
to W7753A. (For note 2, refer to Fig. 8.)  
USE 1/4 IN (6 MM) PNEUMATIC TUBING. MINIMUM BRANCH LINE  
MUST BE 6 FT. (1.8M) OR LONGER.  
M12693  
Fig. 11. Typical Pneumatic Transducer to W7753A.  
7
95-7520—02  
 
EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
+
-
ML7984B  
PWM VALVE ACTUATOR  
24 VAC  
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16  
T6 T5  
C
B
W
R
3
2
3
PWM VALVE  
ACTUATOR  
1
2
4
ON  
TRIAC EQUIVALENT CIRCUIT  
OFF  
W7753A  
4
UNIT  
CONFIGURATION DIP SWITCHES  
(LOCATED ADJACENT TO THE  
INPUT TERMINAL BLOCK)  
VENTILATOR  
CONTROLLER  
1
EARTH GROUND WIRE LENGTH SHOULD BE HELD  
TO A MINIMUM. USE THE HEAVIEST GAUGE WIRE  
AVAILABLE, UP TO 14 AWG (2.O MM2) WITH A MINIMUM  
OF 18 AWG (1.O MM2), FOR EARTH GROUND WIRE.  
E-BUS  
2
3
4
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES  
MUST BE TWISTED TOGETHER BEFORE INSERTION  
INTO THE TERMINAL BLOCK.  
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 J3  
MAKE SURE ALL TRANSFORMER/POWER WIRING  
IS AS SHOWN:REVERSING TERMINATIONS WILL  
RESULT IN EQUIPMENT MALFUNCTION.  
2
1
E-BUS  
TURN POWER OFF BEFORE SETTING THE DIP SWITCHES.  
M12694  
Fig. 13. Typical PWM Valve Actuator to W7753A. (For note 2, refer to Fig. 8.)  
NOTE: Make sure to set the Configuration DIP Switch as shown in Fig. 13. Switches 1 through 3 set the timing of the ML7984B  
valve actuator to match the W7753A outputs (0.1 sec. Min. with a max. time of 25.6 sec.).  
Switch 4 determines the action of the actuator (Off = Direct Acting, On = Reverse Acting).  
CHECKOUT  
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16  
W7753A Checkout  
Step 1. Check Installation and Wiring  
Inspect all wiring connections at the W7753A terminals and  
verify compliance with installation job drawings. If any wiring  
changes are required, first be sure to remove power from the  
controller before starting work. Pay particular attention to:  
— 24 Vac power connections. Verify that multiple controllers  
powered by the same transformer are wired with the  
transformer secondary connected to the same input  
terminal numbers on each W7753A. See Fig. 5. (Controller  
configurations are not necessarily limited to three  
controllers, but the total power draw including accessories  
cannot exceed 100 VA when powered by the same  
transformer (U.S. only). See System Engineering,  
form 74-2964, for power wiring recommendations.  
— Controller wiring. Be sure that each controller is wired  
(terminal 1) on the W7753A to a verified earth ground  
using a wire run as short as possible with the heaviest  
gauge wire available, up to 14 AWG (2.0 mm2) with a  
minimum of 18 AWG (1.0 mm2) for each controller in the  
group. See Fig. 4.  
TRIAC EQUIVALENT CIRCUIT  
W7753A  
UNIT  
VENTILATOR  
CONTROLLER  
E-BUS  
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 J3  
C7600B  
HUMIDITY  
SENSOR  
1
2
(2 TO 10 VOLT)  
E-BUS  
1
2
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE  
THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.O MM2) WITH  
A MINIMUM OF 18 AWG (1.O MM2), FOR EARTH GROUND WIRE.  
— Verify Triac wiring to external controllers uses the proper  
load power/24 Vac hot terminal (terminal 25 on the  
W7753A).  
TO ASSURE PROPER ELECTRICAL CONTACT, WIRESMUST BE TWISTED  
TOGETHER BEFORE INSERTIONINTO THE TERMINAL BLOCK.  
M12696  
NOTE: All wiring must comply with applicable electrical  
codes and ordinances or as specified on installation  
wiring diagrams.  
Fig. 14. Typical 2 to 10 Volt DC humidity sensor to  
W7753A. (For note 2, refer to Fig. 8.)  
95-7520—02  
8
 
EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
•
Node Number: This is the Excel 10 node that has the alarm  
condition (see Network Statics).  
Verify Termination Module Placement  
The installation wiring diagrams should indicate the locations  
for placement of 209541B Termination Module(s). Refer to the  
E-Bus Wiring Guidelines, form 74-2865, and the Excel 10 FTT  
Termination Module Installation Instructions, form 95-7554.  
Correct placement of the termination module(s) is required for  
proper E-Bus communications.  
Alarm Type: The specific alarm being issued. An Excel 10 can  
provide the alarm types listed in Table 1.  
Broadcasting the Service Message  
The Service Message allows a device on the E-Bus to be  
positively identified. The Service Message contains the  
controller ID number and, therefore, can be used to confirm  
the physical location of a particular Excel 10 in a building.  
Step 2. Startup  
W7753A CONTROLLER STATUS LED  
The LED on the front and center of a W7753A Controller  
provides a visual indication of the status of the controller. See  
Fig. 15. When the W7753A receives power, the LED should  
appear in one of the following allowable states:  
There is one method of broadcasting the Service Message  
from an Excel 10 W7753A Controller. This uses a hardware  
push button on the side of the controller (see Fig. 16).  
When an Assign ID command is issued from the  
commissioning tool, the node goes into the  
SERVICE_MESSAGE mode for five minutes. In the  
SERVICE_MESSAGE mode, pressing the service pin on the  
controller or the bypass button on a wall module causes the  
Service Message to be broadcast on the network. All other  
functions are normal in the SERVICE_MESSAGE mode.  
1. Off—no power to the processor.  
2. Continuous On—processor is in initialized state.  
3. Slow Blink—controlling, normal state.  
4. Fast Blink—when the Excel 10 has an alarm condition.  
W7753A  
Step 3. I/O Tests  
The controller must be configured using the Excel 10 E-Vision  
PC configuration tool. Once this is done, the W7753A can be  
commanded to MANUAL mode, and each output can be  
exercised/viewed to verify proper wiring connections and  
equipment operation. See the Excel 10 E-Vision Users Guide,  
form 74-2588 for details on configuring and testing W7753A  
Controllers.  
31  
30  
29  
28  
27  
26  
25  
24  
24  
24  
23  
22  
2
OUT  
21  
3
OUT  
20  
19  
5
OUT  
DI-4  
18  
6
OUT  
GND  
17  
7
OUT  
DI-3  
DI-2  
1
OUT  
GND  
VA  
16  
8
OUT  
C
DI-1  
4
OUT  
VA  
C
COM  
SERVICE  
PIN  
BUTTON  
E
LED  
2
BYP  
ASS  
SNSR  
4
GND  
5
GND  
SET  
PT  
AI-1  
GND  
8
A1-2  
AI-3  
GND  
11  
OHM  
AI-4  
V/mA 22VDC  
OHM  
1
E-BUS  
V/mA  
3
E-BUS  
JACK  
6
OUT  
7
9
1
0
1
2
13  
14  
15  
J3  
STATUS  
LED  
M12697  
Fig. 15. LED location on W7753A.  
ALARMS  
When an Excel 10 has an alarm condition, it reports it to the  
central node on the E-Bus (typically, the Excel 10 Zone  
Manager, or Small Building Controller). See Table 1. The  
information contained in an alarm message follows:  
M10094  
Fig. 16. Location of the service pin button.  
•
Subnet Number: This is the E-Bus subnet that contains the  
Excel 10 node that has the alarm condition. Subnet 1 is on  
the Zone Manager side of the router; Subnet 2 is on the  
other side of the router.  
Step 4. Verify Sequences of Operation  
For the detailed descriptions of the sequences of operation,  
see the Excel 10 Unit Ventilator System Engineering,  
form 74-2964 Appendix B.  
9
95-7520—02  
 
EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
Table 1. Excel 10 Alarms.  
Alarm type  
number  
Name of alarm or error bit  
NO_ALARM  
0
No alarms presently detected.  
INPUT_NV_FAILURE  
1
One or more NV inputs have failed while receiving an update within their  
specified FAILURE_DETECT_TIME.  
NODE_DISABLED  
2
The control algorithm stopped because the controller is in DISABLED_MODE,  
or FACTORY_TEST mode. The control is shut down and disabled until power is  
cycled or the node is reset. See NOTE 1 below.  
SENSOR_FAILURE  
3
One or more sensors have failed.  
FROST_PROTECTION_ALARM 4  
The space temperature is below the frost alarm limit 42.8°F (6°C) when the  
mode is FREEZE_PROTECT. The alarm condition remains until the  
temperature exceeds the alarm limit plus hysteresis.  
INVALID_SET_POINT  
LOSS_OF_AIR_FLOW  
5
6
One of the Setpoints is not in the valid range.  
The Fan Status DI indicates that there is no air flow when the node is  
commanding the fan to run. The control is shut down and disabled until power is  
cycled or the node is reset. The alarm is not issued until FanFailTime seconds  
have elapsed since the loss-of-flow condition was first reported.  
DIRTY_FILTER  
SMOKE_ALARM  
IAQ_OVERRIDE  
7
8
9
The pressure drop across the filter exceeds the limit and the filter requires  
maintenance. The control runs normally.  
The smoke detector has detected smoke and the node has entered an  
emergency state.  
The indoor air quality sensor has detected that the indoor air quality is poorer  
than the desired standard and additional outdoor air is being brought into the  
conditioned space.  
LOW_LIM_ECON_CLOSE  
10  
The economizer has to close beyond the minimum position to prevent the  
discharge air temperature from going below the discharge temperature low  
limit.  
DRIP_PAN_FULL  
FREEZE_STAT  
OAQ_ALARM  
11  
12  
13  
Drip pan maintenance is required. Cooling control is disabled. Fan continues to  
run.  
Very Cold Temperature detected inside the Unit Ventilator Cabinet. Control  
closes OA Damper, and open heat valve.  
The configured outdoor air quality sensor has detected CO or CO2 levels that  
exceeds OaQStPt (plus 30 ppm hysteresis). When there is an OAQ_ALARM,  
the economizer damper is closed.  
RETURN_TO_NORMAL  
128  
255  
Return to no alarm after being in an alarm condition. This code is added  
numerically to another alarm code to indicate that the alarm condition has  
returned to normal.  
ALARM_NOTIFY_DISABLED  
The alarm reporting was turned off by the nviManualMode. No more alarms are  
reported until nviManualMode turns on alarm reporting or upon application  
restart.  
NOTE: The node can be reset by switching the node to MANUAL and then switching to the normal operating mode  
(using DestManMode).  
Also, the Excel 10 network variables, AlarmLogX, where X is 1 through 5, that store the last five alarms to occur in the  
controller, are available. These points can be viewed through XBS, XI584 or E-Vision.  
95-7520—02  
10  
 
 
EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
11  
 
95-7520—02  
EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Toronto, Ontario M1V 4Z9  
Honeywell GmbH  
Böblinger Straße 17  
D-71101 Schönaich  
customer.honeywell.com  
® U.S. Registered Trademark  
© 2009 Honeywell International Inc.  
95-7520—02 K.K. Rev. 03-09  
 

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