Carrier TC -PAC Installation Instructions Manual

Also see for A07050: Installation instructions

Contents

Carrier TC -PAC Installation Instructions Manual Manual pdf 6 page image

4INSTALLATION CONSIDERATIONSModelsThere are four models in the Comfort Series: programmable and non--programmable,AC and HP. Models TC--PAC and TC--NAC are designed for AC systems, controllingone stage of cooling and one stage of heating. They will not operate a heat pump.Models TC--PHP and TC--NHP are designed for HP systems, controlling two stages ofcooling and three stages of heating. They can be converted to AC operation. Select theappropriate model for the intended application.PowerAll Comfort Series models are dual powered. They can operate from batteries or24VAC power. Operation from 24VAC is preferred if available. Battery operation isused when there are not enough wires to support 24VAC operation or when“armchair programming” is desired. For an AC system, up to six wires are neededfor 24VAC operation and one less wire for battery operation. For a HP system, up toseven wires are needed for 24VAC operation and one less wire would be sufficientfor battery operation. For heat only operation with batteries, only two wires arerequired. When battery operation is used, the C terminal does not need to beconnected.Provision is also made for separate heating and cooling transformers via separable Rcand Rh terminals which are connected via factory--installed jumper wire.