Nature's Comfort NCB-175, Инструкция по установке и эксплуатации

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Use this example diagram if you have a typical, basic 4 wire system:
Use the example drawing below if you have a 2 wire system or the thermostat is the advanced
computerized type that communicates back and forth between the furnace (typically found on heat
pump systems).
Do not use this method if your HVAC system utilizes a multi-speed blower.
All
of the parts below are available through your dealer or Nature’s Comfort.