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EXCEL 10 W7751H SMART VAV ACTUATOR
9 95-7553—04
Fig. 18. W7751H discharge air sensing
(For Note 2 instructions, refer to Fig. 15.)
CHECKOUT
W7751H Checkout
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 mm
2
) with a minimum of 18 AWG
(1.0 mm
2
) 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).
NOTE: All wiring must comply with applicable electrical
codes and ordinances. Refer to installation diagrams
for specific wiring.
Verify Termination Module Placement
The installation wiring diagrams should indicate the locations
for placement of Termination Module(s). Refer to the
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 L
ONWORKS® Bus communications.
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.
There are three methods of broadcasting the Service
Message from an Excel 10 W7751H Controller:
1. Physical service pin on controller:
a. Remove the plastic cover and the white button is
located next to the terminal strip.
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.
b. This functionality is supported in firmware version
1.2.15 or higher.
12345678 910
11
12
EARTH
GROUND
24 VAC
COM
OUT 1
OUT 2
E-BUS
COMM
OUT
COMM
IN
24 VAC
W7751H
C7770A AIR
TEMPERATURE SENSOR
M10527A
1
2
2
2
WALL MODULE
EARTH
GND
SENSOR
BYPASS
LED
NOT EARTH GROUND
JACK FOR
E-BUS
NETWORK
ACCESS
7 69 8 54321
T7770D
WALL
MODULE
SET PT
GND
SENSOR
BYPASS
LED
E-BUS
E-BUS
1
2
3
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE
THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.0 MM
2
)
WITH A MINIMUM OF 18 AWG (1.0 MM
2
), FOR EARTH GROUND WIRE.
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
T7750B OR C WALL MODULE.
MICROBRIDGE
DP SENSOR
AIR FLOW
DP PICKUP
AIR FLOW
DIRECTION
LOW
HI
2
TRIAC
EQUIVALENT
CIRCUIT
WIRED FOR MODULATING
OR STAGED REHEAT. SEE
FIG. 17 OR FIG. 18.
SET PT