CARRIER'S INTEGRATED CONTROLS PRODUCTS

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Carrier's products, such as the 39 L, T air-handlers,
A series and H series equipped with P.I.C. controls
do not need an external controller to act as part
of a linkage system. The comfort system air manager
(CSAM) or the CC6400 supports linkage for non Carrier
devices or air-handlers.
(source: Installation, start-up configuration
form # 33ZC-ISI)