Drive motors Before installing or replacing a drive motor, it must be established that the voltage and frequency of the motor (as stated on the nameplate) agree with those of the supply. A motor must not be connected to a supply outside the range stated on the nameplate. If connected to a low voltage supply […]
Continue reading…
Refrigeration equipment servicing and installation
Drive motors
Drive motors Before installing or replacing a drive motor, it must be established that the voltage and frequency of the motor (as stated on the nameplate) agree with those of the supply. A motor must not be connected to a supply outside the range stated on the nameplate. If connected to a low voltage supply […]
Continue reading…
Electrical circuit protection
Electrical circuit protection Every electrical installation must be protected from current overload. This is achieved by locating a protective device at the commencement of each circuit in the form of a fuse or circuit breaker. Their function is to protect the circuit conductors (cables) and not the appliance or user. Fuses Three types of fuse […]
Continue reading…
Electrical circuit protection
Electrical circuit protection Every electrical installation must be protected from current overload. This is achieved by locating a protective device at the commencement of each circuit in the form of a fuse or circuit breaker. Their function is to protect the circuit conductors (cables) and not the appliance or user. Fuses Three types of fuse […]
Continue reading…
Electrical circuit protection
Electrical circuit protection Every electrical installation must be protected from current overload. This is achieved by locating a protective device at the commencement of each circuit in the form of a fuse or circuit breaker. Their function is to protect the circuit conductors (cables) and not the appliance or user. Fuses Three types of fuse […]
Continue reading…
Drive belts and couplings
Drive belts and couplings Drive belts Correct alignment of the flywheel and drive pulley, and correct tensioning of the drive belt(s), are most important during the installation or replacement of belt(s) or motor. Incorrect alignment and tensioning can result in excessive belt wear, loss of compressor efficiency, and motor failure due to faulty motor or […]
Continue reading…
Drive belts and couplings
Drive belts and couplings Drive belts Correct alignment of the flywheel and drive pulley, and correct tensioning of the drive belt(s), are most important during the installation or replacement of belt(s) or motor. Incorrect alignment and tensioning can result in excessive belt wear, loss of compressor efficiency, and motor failure due to faulty motor or […]
Continue reading…
Drive belts and couplings
Drive belts and couplings Drive belts Correct alignment of the flywheel and drive pulley, and correct tensioning of the drive belt(s), are most important during the installation or replacement of belt(s) or motor. Incorrect alignment and tensioning can result in excessive belt wear, loss of compressor efficiency, and motor failure due to faulty motor or […]
Continue reading…
Other system components
Other system components This chapter describes the function and operation of a number of components not previously covered in detail. Solenoid valve This is an electrically operated magnetic valve. It consists of a coil wound around a sleeve of non-magnetic substance. When energized, the coil carries an electrical current and becomes a magnet. Inside the […]
Continue reading…
Other system components
Other system components This chapter describes the function and operation of a number of components not previously covered in detail. Solenoid valve This is an electrically operated magnetic valve. It consists of a coil wound around a sleeve of non-magnetic substance. When energized, the coil carries an electrical current and becomes a magnet. Inside the […]
Continue reading…