Honeywell W7750A User Manual
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
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74-2958—1
Fig. 8. DIN rail adapters.
The FTT supports polarity insensitive free topology wiring.
This frees the system installer from wiring using a specific bus
topology. T-tap, star, loop, and mixed wiring topologies are all
supported by this architecture. The maximum L
This frees the system installer from wiring using a specific bus
topology. T-tap, star, loop, and mixed wiring topologies are all
supported by this architecture. The maximum L
ON
W
ORKS
Bus
length when using a combination of T-tap, star, loop, and bus
wiring (singly terminated) is 1640 ft. (500m) with the maximum
node-to-node length of 1312 ft. (400m). In the event that the
total wire length is exceeded, then a Q7740A 2-Way Repeater
or a Q7740B 4-Way Repeater can be used to allow the
number of devices to be spread out as well as increasing the
length of wire over which they communicate. The maximum
number of repeaters per segment is one (on either side of the
router). A Q7751A,B L
wiring (singly terminated) is 1640 ft. (500m) with the maximum
node-to-node length of 1312 ft. (400m). In the event that the
total wire length is exceeded, then a Q7740A 2-Way Repeater
or a Q7740B 4-Way Repeater can be used to allow the
number of devices to be spread out as well as increasing the
length of wire over which they communicate. The maximum
number of repeaters per segment is one (on either side of the
router). A Q7751A,B L
ON
W
ORKS
Bus Router can also be used
to effectively double the maximum L
ON
W
ORKS
Bus length.
The advantage of using the router is that it segregates traffic
to a segment while when using the repeater, all traffic is
repeated on each segment. When utilizing a doubly
terminated L
to a segment while when using the repeater, all traffic is
repeated on each segment. When utilizing a doubly
terminated L
ON
W
ORKS
Bus structure, use a continuous daisy-
chain with no stubs or taps from the main backbone, The
maximum L
maximum L
ON
W
ORKS
Bus length is 4593 ft. (1400m) with the
maximum node-to-node length of 3773 ft. (1150m).
FTT networks are very flexible and convenient to install and
maintain, but it is imperative to carefully plan the network
layout and create and maintain accurate documentation. This
aids in compliance verification and future expansion of the
FTT network. This also keeps unknown or inaccurate wire run
lengths, node-to-node (device-to-device) distances, node
counts, total wire length, inaccurate repeater/router locations,
and misplaced or missing terminations minimized. Refer to
L
maintain, but it is imperative to carefully plan the network
layout and create and maintain accurate documentation. This
aids in compliance verification and future expansion of the
FTT network. This also keeps unknown or inaccurate wire run
lengths, node-to-node (device-to-device) distances, node
counts, total wire length, inaccurate repeater/router locations,
and misplaced or missing terminations minimized. Refer to
L
ON
W
ORKS
Bus Wiring Guidelines form, 74-2865 for complete
description of network topology rules.
L
ON
M
ARK
® FUNCTIONAL PROFILE
W7750 Controllers support the L
ON
M
ARK
Functional Profile
number 8030 Roof Top Unit Controller, version 1.0
(see Fig. 9).
(see Fig. 9).
M6857
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