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INSTALLATION CONSIDERATIONS
Models
There are four models in the Legacy Ser i es: programmable and non-programma bl e, AC
and HP. Model s T 2-PAC01- A and T2-NAC01- A are designed for AC systems,
controlling one stage of cooling and one stage of heating. They will not operate a heat
pump. Model s T2-PHP 01-A and T2-NHP01-A are desi gned for HP systems,
controlling two stages of cooling and three stages of heating. They can be converted to
AC operation. Se l ect the appropriat e model for the int ended applicat i on.
Power
All Legacy Series models are dual powered. They can operate from batteries or
24VAC power. Operation from 24VAC is preferred if available. Battery operation is
used 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 needed
for 24VAC operation and one less wire for battery operation. For a HP system, up to
seven wires are needed for 24VAC operation and and one less wire is sufficient for
battery operation. For heat only operation with batteries, only two wires are
required. When battery operation is used, the C terminal does not need to be
connected.
Pr ovi sion is al so made for separ at e heating and cooling transfor mer s via separ abl e Rc
and Rh terminals which are connected via factor y- install ed jumper wir e.
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