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INSTALLATION CONSIDERATIONS
Models
There ar e four models i n the Comfort Se ries: pr ogram mabl e and non--program mabl e,
AC and HP. Models TC--PAC and TC--NAC are designed for AC systems, controlling
one stage of cooli ng and one stage of heating. They wil l not operat e a heat pump.
Models TC--PHP and TC--NHP are designed for HP systems, controlling two stages of
cooli ng and thr ee st ages of heating. They can be converted to AC operation. S el ect the
appropri a t e model for the int ended applicat i on.
Power
All Comfort 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 one less wire would be 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 s i on is also made for separa t e heating and cooling tra nsf or mer s via separabl e Rc
and Rh terminal s which are connected via factory--inst alled jumper wire.
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