Figure 31. Centrifugal Fan HD-390/U, schematic diagram.

are jumpered to complete the holding

cooling air through the ducts between the

ground circuit to power supply relay K180

inner and outer walls of the case. The

(fig. 25). The rt unit case blower plug

blower is driven by a single-phase ac in-

P1401 must be properly connected to jack

duction motor that operates on 115 volts

J1407, otherwise the rt unit will not re-

ac, 60 cps. Input power is supplied through

main on after POWER control S701 is re-

terminals D and E of plug P1401. Capacitor

leased (fig. 25).

C1401 provides starting torque for the

motor. Terminals F and H of plug P1401

Figure 31. Centrifugal Fan HD-390/U, schematic diagram.