GMC 1976 ZEO 6083 Maintenance Manual page 742

PRESSURE DROP
A-4775
through compressor start capacitor thus causing cur-
rent to flow only through compressor run capacitor.
COMPRESSOR START CAPACITOR-Is used to throw
the start and run windings current out of phase to
create the torque required to start the motor. It is
designed for intermittent usage and is disconnected
when the motor comes up to speed.
COMPRESSOR RUN CAPACITOR-Is designed for con-
tinuous duty . It increases motor efficiency while im-
proving power factor and reducing amperage .
OVERLOAD PROTECTOR-External protector is con-
nected in series with compressor and all power to the
compressor passes through the protector. The pro-
tector is designed to carry normal starting and oper-
ating currents . The bi-metal disc is affected by both
current and shell temperatures and will disconnect
the compressor if either becomes excessive.
FAN MOTOR RUN CAPACITOR-Is designed for con-
tinuous duty . It increases motor efficiency while im-
proving power factor and reducing amperage .
TIME DELAY RELAY-(DUO-THERM)-Is designed to en-
ergize after an approximately two minute delay, to
Figure 5-Typical Air Conditioning System
ROOF MOUNTED AIR CONDITIONER 24E- 3
allow the refrigeration system to equalize before
compressor starts .
Figure 6-Electrical Components (Mark IV)