Carrier A07049 Installation Instructions Manual

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Carrier A07049 Installation Instructions Manual Manual pdf 4 page image

4INSTALLATION CONSIDERATIONSPowerThis control is powered by 24VAC only. It requires 24VAC (Rh and/or Rc and Cterminals) of the low--voltage transformer to be connected to it for properoperation. It will not operate without these 2 connections. Rh and Rc areconnected via PCB breakout jumper. See Fig. 1. For applications using two24VAC transformers, one in the indoor unit and one in the outdoor unit, connectthe common from each to the C terminal. Connect R from the indoor unit to theRh terminal. Connect R from the outdoor unit to the Rc terminal. Then, breakjumper on the circuit board. The W and HUM signals are taken from the Rhpower and the G signal is taken from the Rc power. If Thermidistat Control hasbeen installed in a two--transformer application that is later changed to asingle--transformer installation, installer must install a field supplied jumperbetween Rc and Rh. Depending on the installation, up to 14 wires may berequired. Installation as two--piece unit is recommended. Only 2 wires arerequired for connection between Display Module and Equipment ControlModule. These two wires (V+ and Vg) do not provide ordinary 24VAC. Theycarry a combination of power and communications data that is unique to theseproducts.