Honeywell EXCEL 10 W7752D - Manual (Page 21)

EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
EN2B-0285GE51 R0909 19
Fig. 15. Free topology L ON W ORKS layout examples
NOTE: See section "L ON W ORKS Termination" on page 23 for
additional details.
IMPORTANT
Notes on Communications Wiring:
• All field wiring must conform to local codes and
ordinances.
• Do not use different wire types or gauges on the
same L ON W ORKS segment. The step change in
line impedance characteristics would cause
unpredictable reflections on the L ON W ORKS net-
work. When using different types is unavoidable,
use a Q7751A Router at the junction.
• Do not use shielded cable for L ON W ORKS wiring
runs. The higher capacitance of the shielded
cable will cause degradation of communications
throughput. In noisy (high EMI) environments,
avoid wire runs parallel to noisy power cables, or
lines containing lighting dimmer switches, and
keep at least 3 in. (76 mm) of separation between
noisy lines and the L ON W ORKS cable.
• Make sure that neither of the L ON W ORKS wires is
grounded.
Power Wiring
IMPORTANT
Notes on Power Wiring:
• All field wiring must conform to local codes and
ordinances.
• See Table 10 for permitted wire sizes.
• To minimize EMI noise, do not run Triac and/or
relay output wires in the same conduit as the
input wires or the L ON W ORKS communications
loop.
• To comply with CE requirements, in the case of
devices having a voltage range of 50 to 1000 Vac
or 75 and 1500 Vdc which are not provided with a
supply cord and a plug or with other means for
disconnection from the supply having a contact
separation of at least 3 mm in all poles, the
means for disconnection must be incorporated in
the fixed wiring.
Step 4. Prepare Wiring Diagrams
General Considerations
The purpose of this step is to assist the application engineer
in developing job drawings to meet job specifications.
NOTE: For field wiring, when two or more wires are to be
attached to the same connector block terminal, be
sure to twist them together. Deviation from this rule
can result in improper electrical contact.
Table 10 lists wiring types, sizes, and length restrictions for
Excel 10 FCU Controller products.