Emerson Copeland Scroll Series, Manual

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Installation Instructions: XJ Scroll Condenser to E2
Document Part # 026-4909 Rev 1 20-OCT-2011 Page 12 of 13
©2011 Emerson Climate Technologies, Inc. This document may be photocopied for personal use.
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technical bulletin
Wiring Types
Retail Solutions specifies Belden #8641 shielded twisted pair cables for use as RS485 Bus wir-
ing (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
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50
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Table 3 - Cable Specs