COMMUNICATION (RS 485) WIRING
System Control
Boiler Monitor
•Use Belden #9842 Cable Or Equivalent (See Note). Polarity must be observed. Make use of wire color coding to ensure proper polarity.
•The shielding foil wrapper - bare wire (drain) - MUST be grounded.
Grounding is done at the System Control Module only. DO NOT ground at Boiler Monitor.
•Note: Equivalent shielded cable must be suitable for RS 485 communication applications; must have
•Install in conduit with no other wiring.
BELDEN #9842
NOTE: Tighten terminal strip clamping screws 20 lbs - In (2.26N.m) Breakage from over torquing is not covered under warranty.
Use copper conductors only.
For supply connections use wires sized on the basis of 60°C Ampacity and rated Min. 90°C (194°F).
|
|
|
|
|
|
|
|
|
|
BOILER MONITOR | SYSTEM CONTROL |
TERMINAL TB 3 | TERMINAL TB2 |
|
|
RS 485 Communications Cable Schematic
Page 13
