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icomfort Wi-Fit 7−Day Programmable Communicating Thermostat
Page 63
Thermostat wire termination in communicating system
Indoor Unit
Controller
Outdoor Unit
icomfort Wi-Fit
thermostat
Single wire to
terminal C
Single wire to
terminal C
Unused wires
Unused wires
Communicating systems using the icomfort Wi-Fit thermostat require four
thermostat wires between the thermostat and the furnace/air handler control
and four wires between the outdoor unit and the furnace/air handler control.
When a thermostat cable with more than four wires is used, the extra wires
must be properly connected to avoid electrical noise. The wires must not be
left disconnected.
Use wire nuts to bundle the unused wires at each end of the cable. A single
wire should then be connected to the indoor unit end of the wire bundle and
attached to the C" terminals as shown in the diagram above.
This is not an issue in non−communicating systems.