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Wiring Considerations
NOTE: See the Observer
®
Zone Panel Installation Instruc-
tions f or wiring of Observer Zoning systems.
Ordinary thermostat wire is recommended. Use 22 AWG or
larger for normal wiring a pplications. Continuous wire lengths
over 25 ft. should use 18 AWG. Wire lengths over 100 ft are
NOT recommended.
NOTE: The communicating bus wiring only requires a
four-wire connection; however, it is good practice to run ther-
mostat cable having more than four wires in the event of a
damaged or broken wire during installation.
Each communicating device in the system has a four-pin
connector. It is recommended that the following color code
be used when wiring each device:
DX+ — Green = Data A
DX- — Yellow = Data B
C — White = 24VAC (Com)
R — Red = 24VAC (Hot)
NOTE: TERMINAL MARKINGS FOR EACH COMMUNICAT-
ING SYSTEM COMPONENT MAY NOT BE IN THE SAME
ORDER. IT IS NOT MANDATORY THAT THE ABOVE COL-
OR CODE BE USED, BUT EACH CONNECTOR IN THE
SYSTEM MUST BE WIRED CONSISTENTLY.
A separate four-pin connector comes inside packaging and
should be used when connecting to furnace (or fan coil). En-
sure connector is inserted properly into circuit board.
1. Turn off all power to equipment.
2. If an existing thermostat or control is being replaced:
a. Remove existing thermostat from wall.
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