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20 PNEG-524 Roof Exhaust Fan
7. ELECTRICAL INSTALLATION
Three Phase System
With the power OFF at the fan disconnect, exchange the location of the current carrying
conductors at terminal L1 and L3 (See Figure 7A) of the magnetic controls. The unit will then
need to be rechecked for proper rotation.
Figure 7A Connecting the Fan Rotation for Three Phase.
Always check current local, state and national codes on electrical requirements before installing
any electrical equipment.
Transformer size is based on the current draw from the fan only. Your electrician will need to add
the KVA requirements for the other components of the system in sizing the transformer.
Copper wire (rated 75°F) is sized for the fan service. The wire size from the transformer to the
disconnect service will be determined from the fan, and the other electrical equipment
requirements.
Figure 7B 24" Roof Fan Exhauster with the Rain hood in Place.