Document Part # 026-4909 Rev 0 11-NOV-2010 Page 11 of 12
©2010 Emerson Climate Technologies Retail Solutions, Inc. This document may be photocopied for personal use.
Visit our website at http://www.emersonretailsolutions.com/ for the latest technical documentation and updates.
Installation Instructions: XJ Scroll Condenser to E2
technical bulletin
Wiring Types
Retail Solutions specifies Belden #8641 shielded twisted pair cables for use as RS485 Bus wiring (or Belden
#82761 and Belden #88761 for plenum installations).
If the recommended cable is not available in your area, be sure the wiring meets or exceeds the following specs:
Shielded? Yes
Conductor Type Twisted Pair
Gauge 18 - 24 AWG
Capacitance between
signal wires
31 pF/ft or less
(9.45 m) or less
Capacitance between
signal and shield
59 pF/ft or less
(17.98 m) or less
Maximum Length 4000 ft/18 to 22 AWG
(1219.2 m)
2500 ft/24 AWG
(762 m)
Nominal Impedance 120:r50:
Table 3 - Cable Specs
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