QED AutoPump AP-2, Operation Manual

Page: 90 / 111

QED Environmental Systems
AP-2 Manual
Page 82
Motor Overload Protection
• To prevent motor damage, provide all compressor motors with overload protection.
Some motors are furnished with built-in thermal overload protection.
• To prevent motor damage due to low voltage or undue load imposed on the motor,
use larger motors in conjunction with starters that include thermal overload units.
• To determine the proper thermal protection (thermal element), consider the load to
be carried, the starting current, the running current, and the ambient temperature.
Recheck electric current characteristics against nameplate characteristics before
connecting wiring.
Caution:
Fuses are for circuit protection only and are not to be considered motor
protection devices. Consult your local power company regarding proper
fuse size.
Air Quality and Pressure
• In compressors requiring lubricating oil, do not use synthetic oil. Synthetic oil can
adversely affect some materials. Non-detergent 30 Weight oil is recommended for
compressor lubrication.
• Install an automatic drain on the compressor holding tank to periodically drain the
water and oil which collects in the tank. This will help to extend air filter cartridge
life.
• Do not lubricate the compressed air coming out of the compressor. QED equipment
is designed to run without the aid of lubricated air. The air filters are designed to
remove oil from the compressed air.
• The compressor should provide between 70 and 250 pounds per square inch (psi)
of air pressure to the system. The filter (with metal bowl) and regulator will accept
a maximum of 250 psi air pressure. Air filters with plastic bowls will accept a
maximum of 150 psi. Maximum output air pressure setting on the regulator is 120
psi.