Honeywell Excel 10 W7753A Users Manual 95 7520_A 10, Unit Ventilator Controller

W7753A to the manual 5f827e47-2578-49ff-bdeb-555c8f2fcece

2015-01-23

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Excel 10
W7753A Unit Ventilator Controller
INSTALLATION INSTRUCTIONS

PRODUCT DESCRIPTION

The W7753A Controller communicates via the 78 kilobaud
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).

30 29

28 27 26

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.

25 24 23
22

21 20 19
24
DI-4 GND
18 17
DI-3 DI-2 GN
16
2
D DI-1 24 VAC 1
3
4
VAC COM OU
5
6
T OUT OUT
7
8
OUT OUT OU
T OUT OUT

E LED BY
PASS SNSR GN
GND
D SET PT AI-1

OHM

GND A1-2
AI-3 GND AI4 22VDC
OHM V/mA
V/mA OUT

E-BUS

11 12 13
14

E-BUS
JACK

M12688

Fig. 1. Excel 10 W7753A Unit Ventilator Controller.

Put Bar Code Here
95-7520—02

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

INSTALLATION

The controller enclosure on the W7753A is constructed of a
sheet metal housing and a plastic factory snap-on cover. The
controller mounts using two screws inserted through the
plastic cover. Use the screws appropriate for the mounting
surface. The W7753A can be mounted in any orientation.
Ventilation openings were designed into the cover to allow
proper heat dissipation regardless of the mounting orientation.

Mount the W7753A in a position that allows clearance for
wiring, servicing and controller removal. Avoid mounting the
W7753A in areas where acid fumes or other deteriorating
vapors can attack the metal parts of the controller, or in areas
where escaping gas or other explosive vapors are present.
See Fig. 2 for mounting dimensions.

The W7753A can also be mounted using DIN rail (obtain
locally). If using DIN rail also purchase from Augat Inc. part
number 2TK2D DIN rail (adapter) two each (See Fig. 3).

2-1/8
(54)

30 29

28 27 26

25 24 23 22 21 20 19 18 17 16
24
3
2
4
6
5
7
8
24 VAC 1
DI-4 GND DI-3 DI-2 GND DI-1 VAC COM OUT OUT OUT OUT OUT OUT OUT OUT

E LED BYPASS SNSR GND SET PT AI-1 GND AI-2 AI-3 GND AI-4 22VDC E-BUS E-BUS
GND
OHM
OHM V/mA
V/mA OUT
JACK
1

11 12 13 14

5-5/8
(143)

3-1/16
(77)

5-3/16 (132)
6 (152)

M12689

Fig. 2. W7753A mounting dimensions in in. (mm).

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
3

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.
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.

M6857

Fig. 3. W7753A DIN rail mounting.
OUTPUT
DEVICE
POWER

Wiring
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.
NOTES:
—

—

—
—

TRANSFORMER

TRIAC LINES
TO ACTUATORS
AND
CONTACTORS
W7753A

CONNECT POWER TO
TERMINALS 24 AND 25

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.

25 24

22 20

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.

95-7520—02

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

24 VAC

120/240 VAC

TRANSFORMER

W7753A
25 24

W7753A

W7753A
25 24

EARTH
GROUND

25 24

EARTH
GROUND

M12682

Fig. 5. Power wiring details for two or more Excel 10s per transformer.

24 VAC
LINE VOLTAGE
GREATER
THAN 150 VAC

TRANSFORMER

W7753A

EARTH
GROUND

EARTH
GROUND
1 IF THE W7750 CONTROLLER IS USED IN UL 1995 EQUIPMENT AND THE
PRIMARY POWER IS MORE THAN 150 VOLTS, GROUND ONE SIDE OF
M12680
TRANSFORMER SECONDARY.

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
Level IV 22 AWG (0.34 mm2) 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.
Pull the cable to each device on the E-Bus and connect to
communication terminals 14 and 15 (W7753A).

95-7520—02

NOTES: (For Communications Wiring)
—
All field wiring must conform to local codes and
ordinances (or as specified on the installation
drawings).
—
Approved cable types for E-Bus communications
wiring is Level IV 22 AWG (0.34 mm2) plenum
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
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 unpredictable reflections on the E-Bus. When using different 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 centers, 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.
—
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 topology, if controllers are on either end of an E-Bus wire
run, mount the termination module on the appropriate terminals as shown in Fig. 7.

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

W7753A

1415

BROWN

W7753A

1415

ORANGE
PART NO. 209541B
TERMINATION
MODULE

PART NO. 209541B
TERMINATION
MODULE

BROWN

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
location, strip 1/2 in. (13 mm) of insulation from the conductors 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.

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.
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)

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.

95-7520—02

WINDOW CONTACT
(CONTACT CLOSED =
WINDOWCLOSED)

+
-

OCCUPANCY SENSOR
(CONTACT CLOSED =
OCCUPIED)

24 VAC

17
OUT 7

16
OUT 8

OUT 5

18
OUT 6

OUT 3

OUT 4

DI-1

OUT 2

GND

OUT 1

DI-2

24 VAC
DI-3

24 VAC COM

GND

M29164

Fig. 9. Typical W7753A unit ventilator application wiring
diagram with T7770F wall module. (For note 2, refer to
Fig. 8.)

AI-4 V/mA

22 VDC OUT

GND

OUTSIDE
AIR CO
SENSOR

E GND

BYPASS

FAN

LED

NET 1
NET 2
SET PT

SENSOR

GND

TR23-F5
WALL MODULE

TRIAC EQUIVALENT CIRCUIT

W7753A
UNIT
VENTILATOR
CONTROLLER

E-BUS

1 2 3 4 5 6 7 8 9 10

AI-3 V/mA

AI-2 OHM

GND

AI-1 OHM

SETPT

GND

SNSR

BYPASS

LED

22 VDC OUT

E-BUS

E-BUS
JACK

AI-4 V/mA

GND

SETPT

AI-3 V/mA

GND

AI-2 OHM

SNSR

GND

BYPASS

AI-1 OHM

LED

E GND

W7753A
UNIT
VENTILATOR
CONTROLLER

DI-4

3
TRIAC EQUIVALENT CIRCUIT

E-BUS

E-BUS
JACK

DI-1

OUT 7

GND

OUT 8

DI-2

OUT 6

DI-3

OUT 5

DI-4

OUT 3

OUT 4

OUT 2

OUT 1

24 VAC COM

24 VAC

GND

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

2
E-BUS

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 TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED
TOGETHER BEFORE INSERTION INTO THE TERMINAL BLOCK.
3 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

DECREASE

17
OUT 7

16
OUT 8

OUT 6

OUT 5

21
OUT 3

OUT 1

OUT 4

OUT 2

24
24 VAC COM

DI-1

25
24 VAC

DI-2

GND

DI-3

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

OUT 8

OPTIONAL 24 VAC WIRING TO NEXT CONTROLLER.

USE 1/4 IN (6 MM) PNEUMATIC TUBING. MINIMUM BRANCH LINE
MUST BE 6 FT. (1.8M) OR LONGER.

C7600C

E-BUS

HUMIDITY
(4 TO 20mA)

E-BUS
JACK

22 VDC OUT

OUT 2

AI-4 V/mA

OUT 1

MAKE SURE ALL TRANSFORMER/POWER WIRING IS AS SHOWN;
REVERSING TERMINATIONS RESULTS IN EQUIPMENT
MALFUNCTION.

W7753A UNIT
VENTILATOR
CONTROLLER
1

GND

AI-3 V/mA

AI-2 OHM

GND

SETPT

TRIAC EQUIVALENT CIRCUIT

AI-1 OHM

GND

SNSR

BYPASS

E GND

25
24 VAC

24 VAC COM

DI-1

DI-2

GROUND

DI-3

DI-4

GROUND

LED

INCREASE

24 (N)

24 (H)

24 (N)

24 (H)

+
-

W7753A
UNIT
VENTILATOR
CONTROLLER

24 VAC

3
B

PNEUMATIC
VALVE

DI-4

MMC325 PNEUMATIC
TRANSDUCER

GND

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

C7600C

ENTHALPY
(4 TO 20mA)
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 TO ASSURE PROPER ELECTRICAL CONTACT, WIRESMUST BE TWISTED
TOGETHER BEFORE INSERTIONINTO THE TERMINAL BLOCK.
M12695

Fig. 12. Typical 4 to 20 mA Humidity and Enthalpy Sensor
to W7753A. (For note 2, refer to Fig. 8.)
M12693

Fig. 11. Typical Pneumatic Transducer to W7753A.

95-7520—02

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

OUT 8

PWM OUTPUT
FROM CNTRL

PWM
(H 24 VAC)

24 (N)

24 (H)

OUT 1

24 VAC

24 VAC COM

DI-1

DI-2

DI-4

PWM VALVE ACTUATOR

GND

ML7984B

DI-3

GND

+
24 VAC
-

T6 T5

PWM VALVE
ACTUATOR

1 2 3 4
ON

22 VDC OUT

OFF
4
CONFIGURATION DIP SWITCHES
(LOCATED ADJACENT TO THE
INPUT TERMINAL BLOCK)

E-BUS
JACK

AI-4 V/mA

GND

SETPT

AI-3 V/mA

GND

AI-2 OHM

SNSR

GND

BYPASS

TRIAC EQUIVALENT CIRCUIT

AI-1 OHM

LED

E GND

W7753A
UNIT
VENTILATOR
CONTROLLER

E-BUS

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 TO ASSURE PROPER ELECTRICAL CONTACT, WIRES
MUST BE TWISTED TOGETHER BEFORE INSERTION
INTO THE TERMINAL BLOCK.
3 MAKE SURE ALL TRANSFORMER/POWER WIRING
IS AS SHOWN:REVERSING TERMINATIONS WILL
RESULT IN EQUIPMENT MALFUNCTION.
4 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).

NOTE: All wiring must comply with applicable electrical
codes and ordinances or as specified on installation
wiring diagrams.
95-7520—02

GND

OUT

AI-2 OHM

AI-3 V/mA

GND

AI-4 V/mA

22 VDC OUT

TRIAC EQUIVALENT CIRCUIT

GND

OUT 7

DI-1
SETPT

5
C7600B

AI-1 OHM

GND

OUT 8

GND

SNSR

HUMIDITY
SENSOR
(2 TO 10 VOLT)

E-BUS
JACK

DI-2

BYPASS

OUT 6

DI-3

W7753A
UNIT
VENTILATOR
CONTROLLER

LED

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.
— Verify Triac wiring to external controllers uses the proper
load power/24 Vac hot terminal (terminal 25 on the
W7753A).

E GND

Step 1. Check Installation and Wiring

OUT 5

GND

W7753A Checkout

OUT 3

OUT 4

OUT 2

OUT 1

24 VAC

24 VAC COM

DI-4

CHECKOUT

E-BUS

2
E-BUS

Fig. 14. Typical 2 to 10 Volt DC humidity sensor to
W7753A. (For note 2, refer to Fig. 8.)

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

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.

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:
1.
2.
3.
4.

Off—no power to the processor.
Continuous On—processor is in initialized state.
Slow Blink—controlling, normal state.
Fast Blink—when the Excel 10 has an alarm condition.

W7753A

• Node Number: This is the Excel 10 node that has the alarm
condition (see Network Statics).
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.
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.

Step 3. I/O Tests
31

30 29

28 27 26

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.

25 24 23
22

21 20 19
24
DI-4 GND
18 17
DI-3 DI-2 GN
16
2
D DI-1 24 VAC 1
3
4
VAC COM OU
5
6
T OUT OUT
7
8
OUT OUT OU
T OUT OUT

SERVICE
PIN
BUTTON

E LED BYP
ASS SNSR GND
GND
SET PT AI-1

OHM

GND A1-2
AI-3 GND AI-4
22VDC
OHM V/mA
V/mA OUT

E-BUS

11 12 13
14

E-BUS
JACK

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:
• 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.

M10094

Fig. 16. Location of the service pin button.

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.

95-7520—02

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Table 1. Excel 10 Alarms.
Name of alarm or error bit

Alarm type
number

NO_ALARM

No alarms presently detected.

INPUT_NV_FAILURE

One or more NV inputs have failed while receiving an update within their
specified FAILURE_DETECT_TIME.

NODE_DISABLED

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

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

One of the Setpoints is not in the valid range.

LOSS_OF_AIR_FLOW

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

The pressure drop across the filter exceeds the limit and the filter requires
maintenance. The control runs normally.

SMOKE_ALARM

The smoke detector has detected smoke and the node has entered an
emergency state.

IAQ_OVERRIDE

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

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

Drip pan maintenance is required. Cooling control is disabled. Fan continues to
run.

FREEZE_STAT

Very Cold Temperature detected inside the Unit Ventilator Cabinet. Control
closes OA Damper, and open heat valve.

OAQ_ALARM

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

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

255

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

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

95-7520—02

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Automation and Control Solutions
Honeywell International Inc.

Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN 55422

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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Title                           : 95-7520_A - Excel 10, W7753A Unit Ventilator Controller
Creator                         : Honeywell Technical Communications
Description                     : Installation Instructions
Create Date                     : 1999:07:07 12:30:47Z
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Subject                         : Installation Instructions
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Honeywell Excel 10 W7753A Users Manual 95 7520_A 10, Unit Ventilator Controller

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