Honeywell Automobile Parts W7751H User Manual

Excel 10 W7751H Smart VAV Actuator  
INSTALLATION INSTRUCTIONS  
BEFORE INSTALLATION  
INSTALLATION  
The W7751H Smart VAV Actuator is a factory-combined  
Excel 10 Variable Air Volume (VAV) Box Controller and an  
ML6174 Direct-Coupled Actuator with De-clutch mechanism.  
The actuator/controller assembly is field mounted to the VAV  
box damper shaft similar to the mounting of a standard  
actuator, and the controller wiring is terminated to the screw  
terminals that are located under a snap-on cover. See Fig. 1.  
The Smart VAV Actuator is a Free Topology Transceiver (FTT)  
LONMARK® compliant controller. The W7751H2025 is for  
smoke control use.  
Horizontally mount the W7751H on the damper shaft and  
allow clearance for wiring, servicing and module removal.  
Avoid mounting the W7751H in areas where acid fumes or  
other deteriorating vapors can attack the metal parts of the  
actuator, or in areas where escaping gas or other explosive  
vapors are present. See Fig. 2 for mounting dimensions.  
The ML6174 Direct-Coupled Actuator with De-clutch  
mechanism (see Fig. 2 for location) allows the installer to  
manually open or close the VAV box damper connected to the  
W7751H without power or software tool to command it.  
The controller in the W7751H contains a Microbridge flow-  
through pressure sensor and communicates via the  
78 kilobaud Echelon® LONWORKS® Bus Network.  
Triac output loads must draw a minimum current of 25 mA at  
24 Vac, 60 Hz nominal. Triac maximum current rating: 77 mA.  
The actuator on the W7751H mounts directly onto the VAV  
box damper shaft and has up to 70 lb-in. torque (8 Nm), 90  
degree stroke, and 90 second timing at 60 Hz.  
M19924  
Fig. 1. Excel 10 Smart VAV Actuator.  
The actuator on the W7751H can accommodate the optional  
field-installed auxiliary switches.  
IMPORTANT  
The assembly is intended only for horizontal shaft  
mounting, to assure proper heat dissipation from the  
controller housing. The Smart VAV Actuator must not  
be mounted with the controller at the top.  
NOTE: Mounting thermostat/sensor greater than 20 ft from  
the W7751H2025 requires 14506944-001 Transient  
Protectors. They must be installed on the thermostat/  
sensor leads from the T7770C pins 3, 4, 5, 6, and 7.  
95-7553-04  
 
EXCEL 10 W7751H SMART VAV ACTUATOR  
CW  
CW  
60  
60  
60  
60  
CCW  
45  
CW  
45  
CCW  
45  
CW  
45  
PULL TOP OF  
COVER OUT,  
THEN DOWN,  
FOR REMOVAL  
CIRCUIT BOARD  
TERMINAL BLOCKS  
M10000  
MOUNTING TAB  
Fig. 3. Cover removal and mounting tab/terminal block access.  
3. The direction the damper shaft rotates to open the  
damper (CW or CCW), see Fig. 5.  
4. The damper opening angle (45, 60, or 90 degrees).  
1MM (1/32 IN.)  
TYPE A DAMPER  
AIR  
FLOW  
CW TO OPEN, CCW TO CLOSE  
TYPE B DAMPER  
AIR  
FLOW  
CCW TO OPEN, CW TO CLOSE  
M2067B  
1MM  
(1/32 IN.)  
Fig. 5. Determining rotation direction (CW or CCW)  
for damper opening.  
M20884  
If damper shaft diameter is 3/8 inch (10 mm) round or square,  
use part 201391 Shaft Adapter (shipped with the W7751H  
Smart VAV Actuator). Ensure it is placed opposite set screws.  
See Fig. 6. The adapter centers a 3/8 in. (10 mm) shaft in the  
hub. Failure to use the adapter on a 3/8 in. (10 mm) shaft  
causes the mounting tab to loosen. A 1/2 in. (13 mm) shaft  
does not require the use of the adapter.  
Fig. 4. Mounting W7751H to VAV box damper housing  
when actuator is not parallel to VAV box damper housing.  
Before mounting the W7751H onto the VAV box damper shaft,  
determine the following:  
1. The damper shaft diameter, 3/8 to 1/2 in. (10 to 13 mm).  
2. If the length of the VAV box damper shaft is less than  
1-3/8 in. (35 mm), use the Short Shaft Adapter Kit (not  
included), part no. 4074EVK.  
3
95-7553—04  
 
EXCEL 10 W7751H SMART VAV ACTUATOR  
degree CW slot, the damper actuator must be  
driven fully open (CCW). To do this, the  
controller on the W7751H must be wired,  
powered, and connected to the portable PC via  
SHAFT ADAPTER  
®
the Serial LonTalk Adapter (SLTA). The SLTA  
connects to the controller on the W7751H via  
the jack for Network Access on T7770 Wall  
Module or by the B-Port on the Q7750A Zone  
Manager. From E-Vision Software, drive the  
actuator on the W7751H fully CCW, and insert  
the range stop pin in either the 45 or 60 degree  
CW slot, whichever applies (see Fig. 7). The  
range stop pin must go all the way through the  
housing. The pin can only be installed in the  
CW slots when the actuator is in the CCW  
position. (Disconnect the portable PC once  
programming has been completed.) Manually  
open the damper shaft fully (CCW) and then  
tighten the Allen set screws. When the  
M2064  
Fig. 6. Use Damper Shaft Adapter for 3/8 in. (10 mm)  
diameter round or square damper shafts.  
The W7751H is shipped with the actuator rotated in the fully  
clockwise (CW) position. The installation procedure varies  
depending on the damper direction and angle:  
1. If the damper rotates clockwise (CW) to open, and the  
angle of the damper open to closed is 90 degrees,  
manually open the damper fully to the clockwise  
direction and mount the W7751H to the VAV damper  
box and shaft. Tighten the Allen set screws. The part  
no. 201614 Range Stop Pin, which is shipped with the  
W7751H Smart VAV Actuator, is unnecessary. When  
the W7751H closes, the damper rotates CCW 90  
degrees to fully close.  
W7751H closes, the damper will rotate CW 45  
or 60 degrees to fully close.  
CW  
60  
CCW  
2. If the damper rotates clockwise (CW) to open, and the  
angle of the damper open to closed is 45 or 60 degrees,  
manually open the damper fully to the clockwise  
direction and mount the W7751H to the VAV damper  
box and shaft. Tighten the Allen set screws. Insert the  
part no. 201614 Range Stop Pin, which is shipped with  
the W7751H Smart VAV Actuator, in either the 45 or  
60 degree CCW slot, whichever applies (see Fig. 7).  
The range stop pin must go all the way through the  
housing. The pin can only be installed in the CCW slots  
when the actuator is in the CW position. When the  
W7751H closes, the damper rotates CCW either 45 or  
60 degrees to fully close.  
3. If the damper rotates counterclockwise (CCW) to open,  
and the angle of the damper open to closed is  
90 degrees, manually close the damper fully to the  
clockwise direction and mount the W7751H to the  
damper box and shaft. Tighten the Allen set screws.  
The part no. 201614 Range Stop Pin, which is shipped  
with the W7751H Smart VAV Actuator, is unnecessary.  
When the W7751H opens, the damper rotates CCW 90  
degrees to fully open.  
RANGE  
CW  
STOP PIN  
45  
60  
CCW  
45  
ACTUATOR  
PLATES  
M10002  
Fig. 7. Properly inserting range stop pin.  
The Honeywell Software Tool’s (miscellaneous parameter for  
rotation direction) defaults to CW to Open, which applies to  
the damper direction and angle in items 1 and 2 above. The  
parameter must be changed to CCW to Open if the damper  
shaft rotates in this direction, which applies to the damper  
direction and angle in items 3 and 4 above.  
IMPORTANT  
It is advisable to leave the dampers in an open  
position after W7751H installation to avoid the  
possibility of overpressurizing the ductwork on fan  
startup. Use the De-clutch lever (see Fig. 2 for  
De-clutch lever location) to open the box damper on  
W7751H controllers that are powered down, to  
prevent overpressurization in the ductwork on fan  
startup. To use the De-clutch lever, press and hold  
the lever in the direction of the arrow (this  
disengages the motor). Turn the damper shaft until  
the damper is open and release the lever. When  
power is restored to the W7751H controller, the  
controller synchronizes the damper actuator so that  
the damper is in the correct position upon startup.  
NOTE: Be aware that the damper is closed. Until the  
W7751H is powered and the damper is driven  
open, starting the fan system with all the VAV  
box dampers closed can cause duct over-  
pressurization and damage.  
4. If the damper rotates counterclockwise (CCW) to open,  
and the angle of the damper open to closed is 45 or  
60 degrees, see the following NOTE.  
When a range stop pin is used with a field-added auxiliary  
switch, the tab on top of the range stop pin must point inward  
toward the VAV damper box shaft. See Fig. 11. This allows  
clearance for the auxiliary switch housing. To remove the pin,  
pry it up with a flathead screwdriver. See Fig. 8.  
NOTE: Special precautions must be taken for this  
application. Mount the W7751H to the damper  
box. (Do not tighten the Allen set screws yet).  
Before the part no. 201614 Range Stop Pin,  
which is shipped with the W7751H Smart VAV  
Actuator, can be inserted in either the 45 or 60  
95-7553—04  
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EXCEL 10 W7751H SMART VAV ACTUATOR  
IMPORTANT  
The minimum position set screw on the actuator is  
To prevent VAV air flow connector breakage, use  
caution when removing tubing from it. Always pull  
straight away from connector; never remove by  
pulling at an angle.  
not available on the W7751H device.  
SCREWDRIVER  
Wiring  
All wiring must comply with applicable electrical codes and  
ordinances, or as specified on installation wiring diagrams.  
NOTES:  
For multiple controllers operating from a single  
transformer, the same side of the transformer  
secondary must be connected to the same input  
terminal in each controller and the ground  
terminals (3 on the W7751H, 28 on the W7751B,  
and 32 on the W7751D,F) must be connected to a  
verified earth ground for each controller in the  
group. See Fig. 10. (Controller configurations are  
not necessarily limited to three devices, but the  
total power draw including accessories cannot  
exceed 100 VA when powered by the same  
transformer. See System Engineering form  
74-2949 for power wiring recommendations.)  
All loads on an Excel 10 Controller must be  
powered by a single transformer.  
M2065  
Fig. 8. Lifting a range stop pin out of its slot.  
Piping  
Air flow Pickup  
Connect the air flow pickup to the two connectors on the  
controller of the W7751H. See Fig. 9.  
CW  
Keep the earth ground connection (terminal 3)  
wire run as short as possible. Refer to Fig. 16.  
Do not connect the analog ground terminal (5) to  
earth ground. Refer to Fig. 16.  
AIRFLOW  
DP PICKUP  
AIRFLOW  
DIRECTION  
60  
60  
CW  
CCW  
Power  
45  
45  
The 24 Vac power from an energy limited Class II Power  
Source must be provided to each Smart VAV Actuator. To  
conform to Class II restrictions, transformers must not be  
larger than 100 VA. The maximum current draw at 24 Vac is  
1.25A.  
– LO  
+ HI  
IMPORTANT  
M10003  
— Power must be off prior to connecting to or removing  
connections from output terminals 9 and 10.  
— 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. For  
nonplenum, open areas, run cables exposed (or in  
conduit, if required).  
Fig. 9. Smart VAV Actuator air flow pickup connections.  
NOTES:  
Use 1/4 in. (6 mm) outside diameter with 0.040 in.  
(1 mm) wall thickness plenum rated 1219 FR  
(94V-2) pneumatic tubing.  
— If the W7751H Smart VAV Actuator is used on  
Heating and Cooling Equipment (UL 1995, US  
only) and the transformer primary power is more  
than 150 volts, connect the transformer secondary to  
earth ground, see Fig. 10.  
Always use a fresh cut on the end of the tubing  
that connects to the air flow pickups and the  
connectors on the VAV controllers.  
Connect the high pressure or upstream tube to the plastic  
restrictor labeled (+ HI) or P1 and the low pressure or  
downstream tube to the restrictor labeled (- LO) or P2. See  
labeling in Fig. 9.  
NOTE: Maintain a three-inch (76 millimeter) separation  
between Triac outputs and LONWORKS® Bus wiring  
throughout installation.  
NOTES:  
If controllers are mounted in unusually dusty or  
dirty environments, a 5-micron disposable air filter  
is recommended for the high pressure line  
(marked as +) connected to the air flow pickup.  
When using twin tubing from pickup, split pickup  
tubing a short length to accommodate connections.  
Tubing from air flow pickup to VAV controller  
should not exceed three feet (0.914m). Lengths  
longer than this can degrade flow sensing  
accuracy.  
Auxiliary Switches  
The 201052A,B,C Auxiliary Switch can be used with the  
W7751H. It allows for control of equipment external to the  
actuator (for example, electric reheat coils or fan) at an  
adjustable point in the stroke (from 0 to 90 degrees) of the  
actuator. The 201052 Switch is field-added. Self-tapping  
Phillips head screws are included with the switch. The switch  
can be mounted only one way (see Fig. 11) with the switch  
contacts pointed to the top of the actuator.  
5
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EXCEL 10 W7751H SMART VAV ACTUATOR  
PROCEDURE  
W7751B  
28  
1. Determine desired switching action (i.e, if switch  
energizing is to occur during CW or CCW rotation). With  
switch cam as shown in Fig. 12, the normally closed  
contact opens in CCW rotation. The normally open  
contact closes. Conversely, with switch cam as shown  
in Fig. 13, the normally closed contact opens during CW  
rotation and the normally open contact closes.  
EARTH  
GROUND  
9
10  
W7751H OR J  
COM  
NO  
NC  
W7751D,F  
32  
CCW  
EARTH  
GROUND  
M2160  
1
2
3
4
Fig. 12. Switching configuration for CCW rotation  
(top view).  
1
2
3
COM  
24  
VAC  
120/240  
VAC  
NO  
NC  
EARTH  
GROUND  
TRANSFORMER  
CW  
1
EARTH  
GROUND  
1
IF THE W7751 CONTROLLER IS USED IN UL 1995 EQUIPMENT AND THE  
PRIMARY POWER IS MORE THAN 150 VOLTS, GROUND ONE SIDE  
OF TRANSFORMER SECONDARY.  
M10524A  
M2161  
Fig. 10. Power wiring for multiple controllers.  
Fig. 13. Switching configuration for CW rotation  
(top view).  
201052 AUXILARY  
RANGE STOP PIN  
SWITCH  
POINTED TOWARD  
2. Align switch hub with actuator set screws. Mount switch  
on actuator and tighten the three captive screws.  
3. Connect controller with laptop PC. To do this, the  
controller on the W7751H must be wired, powered, and  
connected to the portable PC via the SLTA. The SLTA  
connects to the controller on the W7751H via Network  
Access Jack on the T7770 Wall Module or by B-Port on  
the Q7750A Zone Manager. From E-Vision Software,  
drive the W7751H actuator and halt the motion at the  
desired position for switch operation.  
SHAFT  
N
C
N
O
COM  
45  
NOTE: When installed, angular position indicator on  
the switch face moves from 90 to 0 degrees  
during CCW motion and from 0 to 90 degrees  
during CW motion.  
M10005  
Fig. 11. 201052 Auxiliary Switch mounted on W7751H.  
NOTES:  
4. Once finished programming, disconnect the portable  
PC.  
If a range stop pin is used, it must be pointing  
inward toward the shaft (see Fig. 11) to allow  
clearance for the auxiliary switch.  
Each switch is independently adjustable in two-  
degree increments to any point within the travel of  
the actuator. Switches have a fixed differential of  
approximately three angular degrees.  
5. With a screwdriver, move the cam inside the switch  
assembly to the appropriate position, remembering cam  
travel direction for switching purposes (see Fig. 14)  
when turning switch on or off. Monitor switch closure  
with ohmmeter for a continuity check. Normally closed  
contact should measure zero ohms and normally open  
contact should measure infinite ohms when switch is not  
activated. The opposite is true when switch is activated.  
95-7553—04  
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EXCEL 10 W7751H SMART VAV ACTUATOR  
2
Approved cable type is Level IV 22 AWG (0.34 mm )  
plenum or non-plenum rated unshielded, twisted pair, solid  
conductor wire:  
SWITCH CAMS  
For nonplenum areas, use CMP listed cable.  
In plenum areas, use CMP listed cable.  
Do not bundle output wires with sensor, digital input or  
LONWORKS® Bus wires.  
Ensure that neither LONWORKS® Bus wire is grounded.  
In noisy (high EMI) environments, avoid wire runs parallel  
to noisy power cables, motor control centers, or lines  
containing lighting dimmer switches. Keep at least 3 in.  
(76 mm) of separation between noisy lines and  
LONWORKS® Bus cable.  
M2076A  
Do not use different wire types or gauges on the same  
LONWORKS® Bus segment:  
Step changes in line impedance characteristics cause  
unpredictable reflections on the LONWORKS® Bus.  
Fig. 14. Auxiliary switch cam adjustment.  
NOTE: For 2 or 3 switch models, cams align with their  
respective switches and are individually set  
using the same procedure described above.  
Wiring Details  
Wire to the terminal blocks as follows:  
1. Strip 3/16 in. (5 mm) insulation from the conductor.  
2. Insert the wire in the required terminal location and  
tighten the screw to complete the termination.  
6. Ensure switch activation at the desired degree of stroke  
by commanding the actuator to both fully open and fully  
closed; see step 3.  
NOTE: With the exception of 14 AWG (2.0 mm2), if  
inserting two or more wires into one terminal  
location, twist wires together before inserting  
them. See Fig. 15. Deviation from this rule can  
result in improper electrical contact.  
NOTE: Switches can also be preset prior to actuator  
installation if angular switch position is known.  
Communications  
Refer to LONWORKS® Bus Wiring Guidelines, form 74-8565,  
for complete description of LONWORKS® Bus network topology  
rules.f  
The controller on the W7751H has the terminal arrangement  
shown in Fig. 16. Fig. 16 through 21 provide detailed wiring  
diagrams for the W7751H. Refer to installation diagrams for  
specific wiring.  
If a longer LONWORKS® Bus network is required, a Q7740A  
2-way or Q7740B 4-way Repeater can be added to extend  
LONWORKS® Bus length, only if this is an Energy  
Management (PAZX) Bus.  
NOTE: Ensure Configuration DIP Switch is set as shown in  
Fig. 19. Switches 1 through 3 set ML7984B Valve  
Actuator timing to match W7751H outputs (0.1 sec.  
minimum with maximum time of 25.6 sec.). Switch 4  
determines actuator action (Off = Direct Acting, On =  
Reverse Acting).  
IMPORTANT  
The Q7740A,B Repeaters cannot be used in  
smoke control applications.  
A Q7751A Router can only be added to an Energy  
Management Bus to partition system into two segments  
(effectively doubling LONWORKS® Bus length). Only one  
router is allowed with each Excel 10 Zone Manager (or Excel  
15 Building Manager), and each network segment can have a  
maximum of one repeater.  
1.STRIP 1/2 IN.  
1/2  
(13)  
CONTROLLER OR  
WALL MODULE  
E-BUS CONNECTOR  
TERMINALS  
(13 MM) FROM  
WIRES TO BE  
ATTACHED AT  
ONE TERMINAL.  
Pull the cable to each device on the LONWORKS® Bus and  
connect to communication terminals 11 and 12 (W7751H).  
IMPORTANT  
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.  
2.TWIST WIRES  
TOGETHER  
WITH PLIERS  
(A MINIMUM OF  
THREE TURNS).  
Screw type terminal blocks are designed to accept  
no more than one 14 AWG (2.0 mm2) conductor.  
Multiple 14 AWG (2.0 mm2) wires can be connected  
with a wire nut. Include a pigtail with this wire group  
and attach the pigtail to the individual terminal block.  
M11413  
Notes on LonWorks® Bus Communications Wiring:  
Fig. 15. Attaching two or more wires at terminal blocks.  
All field wiring must conform to local codes and ordinances  
(or as specified on the installation drawings).  
7
95-7553—04  
 
EXCEL 10 W7751H SMART VAV ACTUATOR  
COMM  
OUT  
COMM  
OUT  
2
2
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
JACK FOR  
E-BUS  
NETWORK  
ACCESS  
JACK FOR  
E-BUS  
NETWORK  
ACCESS  
T7770C  
WALL  
MODULE  
AIR FLOW  
DP PICKUP  
T7770C  
WALL  
MODULE  
AIR FLOW  
DP PICKUP  
AIR FLOW  
DIRECTION  
AIR FLOW  
DIRECTION  
LOW  
MICROBRIDGE  
DP SENSOR  
W7751H  
LOW  
HI  
HI  
MICROBRIDGE  
DP SENSOR  
W7751H  
TRIAC  
EQUIVALENT  
NOT EARTH GROUND  
CIRCUIT  
TRIAC  
EQUIVALENT  
CIRCUIT  
NOT EARTH GROUND  
E-BUS  
12  
WALL MODULE  
1
2
3
4
5
6
7
8
9
10  
11  
E-BUS  
12  
2
WALL MODULE  
1
2
2
3
4
5
6
7
8
9
10  
11  
2
24 VAC  
COMM  
IN  
24 VAC  
2
COMM  
IN  
1
OPEN  
SIGNAL  
EARTH  
GROUND  
1
STAGE 2  
STAGE 1  
CLOSED  
SIGNAL  
EARTH  
GROUND  
NOTE: LOAD POWER WIRE  
IS CONNECTED  
TO TERMINAL 1.  
CONTACTORS  
24 VAC ONLY  
NOTE: LOAD POWER WIRE  
IS CONNECTED  
STEM  
COM  
STEM  
UP  
DOWN  
TO TERMINAL 1.  
LINE POWER  
M6410 SERIES 60  
VALVE ACTUATOR  
1
2
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE  
THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.0 MM2)  
WITH A MINIMUM OF 18 AWG (1.0 MM2), FOR EARTH GROUND WIRE.  
TWO OR THREE-WAY VALVE  
1
2
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE  
THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.0 MM2)  
WITH A MINIMUM OF 18 AWG (1.0 MM2), FOR EARTH GROUND WIRE.  
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED  
TOGETHER BEFORE INSERTING INTO THE TERMINAL BLOCK.  
M10526  
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED  
TOGETHER BEFORE INSERTING INTO THE TERMINAL BLOCK.  
M10525  
Fig. 17. W7751H 2-stage reheat wiring diagram.  
(For Note 2 instructions, refer to Fig. 15.)  
Fig. 16. W7751H modulating reheat valve wiring diagram.  
(For Note 2 instructions, refer to Fig. 15.)  
95-7553—04  
8
 
EXCEL 10 W7751H SMART VAV ACTUATOR  
CHECKOUT  
COMM  
OUT  
W7751H Checkout  
2
9
8
7
6
5
4
3
2
1
Step 1. Wiring Connections  
Inspect all wiring connections at the W7751H and the T7770  
terminals, and verify compliance with installation diagrams. 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 multiple controllers being  
powered by the same transformer are wired with the  
transformer secondary connected to the same input  
terminal numbers on each W7751. See Fig. 10. (Controller  
configurations are not necessarily limited to three devices,  
but the total power draw including accessories cannot  
exceed 100 VA when powered by the same transformer.  
See System Engineering form 74-2949 for power wiring  
recommendations.)  
— Controller wiring. Be sure that each controller is wired  
(terminal 3 on the W7751H, 28 on the W7751B, and 32 on  
the W7751D,F) 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. 10.  
— Verify Triac wiring to external devices uses the proper load  
power/24 Vac Hot terminal (terminal 1 on the W7751H).  
JACK FOR  
E-BUS  
T7770D  
WALL  
NETWORK  
ACCESS  
MODULE  
AIR FLOW  
DP PICKUP  
AIR FLOW  
DIRECTION  
LOW  
HI  
MICROBRIDGE  
DP SENSOR  
W7751H  
TRIAC  
EQUIVALENT  
NOT EARTH GROUND  
CIRCUIT  
NOTE: All wiring must comply with applicable electrical  
codes and ordinances. Refer to installation diagrams  
for specific wiring.  
E-BUS  
12  
WALL MODULE  
1
2
3
4
5
6
7
8
9
10  
11  
2
2
Verify Termination Module Placement  
The installation wiring diagrams should indicate the locations  
for placement of Termination Module(s). Refer to the  
24 VAC  
2
LONWORKS® 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 LONWORKS® Bus communications.  
COMM  
IN  
WIRED FOR MODULATING  
OR STAGED REHEAT. SEE  
FIG. 17 OR FIG. 18.  
1
EARTH  
GROUND  
Step 2. Startup  
Broadcasting the Service Message  
The Service Message allows a device on the LONWORKS®  
Bus to be positively identified. The Service Message contains  
the controller neuron ID number and, therefore, can be used  
to confirm the physical location of a particular Excel 10 in  
building.  
C7770A AIR  
TEMPERATURE SENSOR  
1
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE  
THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.0 MM2)  
WITH A MINIMUM OF 18 AWG (1.0 MM2), FOR EARTH GROUND WIRE.  
There are three methods of broadcasting the Service  
Message from an Excel 10 W7751H Controller:  
1. Physical service pin on controller:  
2
3
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED  
TOGETHER BEFORE INSERTING INTO THE TERMINAL BLOCK.  
NOTE: AIR TEMPERATURE SENSOR CANNOT BE USED WITH EITHER THE  
a. Remove the plastic cover and the white button is  
located next to the terminal strip.  
T7750B OR C WALL MODULE.  
M10527A  
b. Momentarily pressing this service pin broadcasts  
the Service Message on the network.  
2. Using the wall module bypass pushbutton:  
a. By pressing the wall module bypass/override button  
for more than four seconds, the controller sends the  
Service Message.  
Fig. 18. W7751H discharge air sensing  
(For Note 2 instructions, refer to Fig. 15.)  
b. This functionality is supported in firmware version  
1.2.15 or higher.  
9
95-7553—04  
 
EXCEL 10 W7751H SMART VAV ACTUATOR  
NOTE: During item 2, the occupancy override state of  
the controller changes based on how long the  
bypass/override button is depressed. For  
example, if the button is pressed for 6 sec., the  
node sends the Service Pin Message, AND the  
node enters Continuous Unocc mode. To clear  
Continuous Unocc mode, the button must be  
pressed momentarily.  
Alarms  
The commissioning tool is used to perform the ID Assignment  
task. Once the ID Assignment and commissioning has been  
done, check the controller status LED to determine if there are  
any alarms.  
W7751 Controller Status LED  
The LED on the front of a W7751H Controller (located just  
under the plastic cover), provides a visual indication of the  
status of the device. When the W7751H receives power, the  
LED appears in one of the following allowable states:  
1. Off—no power to the processor.  
3. The following method is only supported on E-Vision and  
LONSPEC™:  
a. When an Assign ID command is issued from the  
Honeywell Software listed, the node enters the  
SERVICE_MESSAGE mode for five minutes.  
b. In this mode, pressing the bypass/override button  
causes the Service Message to be broadcast on the  
network.  
2. Continuous on—processor is in initialized state.  
3. Slow blink—controlling, normal state.  
4. Fast blink—when the Excel 10 VAV Controller has an  
alarm condition.  
c. All other functions are normal in this mode.  
d. If the bypass/override button is not available, short-  
ing the controller Bypass Input terminals (on  
W7751H short terminals 5 and 7) broadcasts the  
Service Message.  
When an Excel 10 has an alarm condition, it reports it to the  
central node on the LONWORKS® Bus. Also, the Excel 10 VAV  
Controller 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 workstation  
software. Refer to the VAV System Engineering Guide form,  
74-2949 Table 12 for a description of the Excel 10 Alarms.  
NOTE: The node can be reset by switching the node to  
MANUAL and then to the normal operating mode.  
ML7984B  
PWM VALVE ACTUATOR  
REHEAT VALVE  
ACTUATOR  
W7751H  
TRIAC  
EQUIVALENT  
CIRCUIT  
NOT EARTH GROUND  
T6 T5  
C
B
W
R
2
ML7984B  
PWM VALVE ACTUATOR  
E-BUS  
WALL MODULE  
1
2
3
4
5
6
7
8
9
10  
12  
11  
T6 T5  
C
B
W
R
PERIPHERAL REHEAT  
VALVE ACTUATOR  
2
1
1
2
3
4
24 VAC  
ON  
OFF  
1
2
MAKE SURE ALL TRANSFORMER/POWER WIRING IS AS SHOWN;  
REVERSING TERMINATIONS WILL RESULT IN EQUIPMENT MALFUNCTION.  
CONFIGURATION DIP SWITCHES  
LOCATED ADJACENT TO THE INPUT  
TERMINAL BLOCK ON ML7948B  
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST  
BE TWISTED TOGETHER BEFORE INSERTING INTO THE TERMINAL BLOCK.  
M10528  
Fig. 19. W7751H to PWM Valve Actuator.  
95-7553—04  
10  
 
EXCEL 10 W7751H SMART VAV ACTUATOR  
SERIES OR  
PARALLEL  
FAN  
W7751H  
TRIAC  
EQUIVALENT  
CIRCUIT  
NOT EARTH GROUND  
ML7984B  
PWM VALVE ACTUATOR  
CONTACTOR  
(24 VAC)  
E-BUS  
WALL MODULE  
1
2
3
4
5
6
7
8
9
10  
12  
11  
T6 T5  
C
B
W
R
2
REHEAT  
VALVE  
ACTUATOR  
1
24 VAC  
1
2
MAKE SURE ALL TRANSFORMER/POWER WIRING IS AS SHOWN; REVERSING TERMINATIONS WILL RESULT IN EQUIPMENT MALFUNCTION.  
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED TOGETHER BEFORE INSERTING INTO THE TERMINAL BLOCK.  
M10529  
Fig. 20. W7751H to PWM Valve Actuator and series or parallel fan.  
W7751H  
NOT EARTH GROUND  
TRIAC  
MMC325 PNEUMATIC  
TRANSDUCER  
EQUIVALENT  
M
CIRCUIT  
M
B
4
E-BUS  
WALL MODULE  
1
2
3
4
5
6
7
8
9
10  
12  
11  
1
2
3
PNEUMATIC  
VALVE  
24 VAC  
1
2
REVERSE WIRES (INCREASE/DECREASE) TO REVERSE ACTION (DIRECT/REVERSE).  
MAKE SURE ALL TRANSFORMER/POWER WIRING IS AS SHOWN; REVERSING TERMINATIONS WILL RESULT IN EQUIPMENT MALFUNCTION.  
OPTIONAL 24 VAC WIRING TO NEXT CONTROLLER.  
3
4
M10530  
USE 1/4 IN. (6 MM) MINIMUM PNEUMATIC TUBING. BRANCH LINE MUST BE 6 FT (1.8M) OR LONGER.  
Fig. 21. W7751H to pneumatic transducer.  
11  
95-7553—04  
 
EXCEL 10 W7751H SMART VAV ACTUATOR  
— W7751H2025 Series 9,  
— W7761A2010,  
— Q7750,  
— Q9200,  
— XFL521, XFL522, XFL523, XFL524,  
— XL500,  
T7770C or D Wall Module Override LED  
The remote override LED, located on either the T7770C or  
T7770D Wall Module will display the Manual Override mode of  
the controller. The modes are:  
1. LED = Off. No override active.  
2. LED = Continuously On. Bypass mode (timed Occupied  
— XLINK.  
override).  
3. LED = One flash per second. Continuous Unoccupied  
override.  
4. LED = Two flashes per second. Remote only,  
Connect the controller with the laptop PC. To do this, the  
controller on the W7751H must be wired, powered, and  
connected to the portable PC via the SLTA. The SLTA  
connects to the controller on the W7751H via the Jack for  
Network Access on T7770 Wall Modules or by the B-Port on  
the Q7750A Zone Manager. From LONSPEC™, or E-Vision  
Software, drive the actuator on the W7751H open and then  
closed. Observe the operation of the actuator; if the damper is  
closed, it should begin to open. If the damper is open, it  
should begin to close.  
continuous Occupied override.  
Step 3. I/O Tests  
The controller can be configured using the LONSPEC™, or  
E-Vision PC configuration tool. Once this is done, the  
W7751H can be commanded to MANUAL mode, and each  
output and input can be exercised/viewed to verify proper  
wiring connections and equipment operation.  
NOTE: Once finished programming, disconnect the portable  
PC.  
W7751H Actuator Checkout  
To check out the actuator on the W7751H, determine the  
direction the damper shaft moves to open the damper (CW or  
CCW). See Fig. 5.  
If no movement is observed, check to see if 24 Vac is present  
at the controller on the W7751H. With proper wiring, 24 Vac  
present, and proper commands from the software, the  
actuator should operate properly. If not, the W7751H Smart  
VAV Actuator may need to be replaced.  
NOTE: Devices for use only if used for Energy Management:  
Q7740A,B and Q7751A.  
Step 4. Verify Sequences of Operation  
For the detailed descriptions of the sequences of operation,  
see the Excel 10 VAV System Engineering form 74-2949.  
Devices for use on an Energy Management and/or Smoke  
Control:  
— 14507287 Series Power Supplies,  
— W7751B2010, W7751D2016, W7751F2011,  
®
LONWORKS® and LONTALK® are registered trademarks of Echelon Corporation.  
®
LONSPEC™ is a trademark of Echelon Corporation.  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
customer.honeywell.com  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Toronto, Ontario M1V 4Z9  
® U.S. Registered Trademark  
© 2008 Honeywell International Inc.  
95-7553—04 M.S. Rev. 03-08  
 

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