REVERSE CYCLE REFRIGERATION and AIR CONDITIONING UNIT

The 808 Reverse Cycle refrigeration and Air Conditioning Training Unit is designed specifically for use by students of refrigeration and air conditioning. The unit uses components that should be familiar to students who will be undertaking courses that will enable them to install and maintain refrigeration and air conditioning equipment. Like the equipment that students will ultimately train to maintain the 808 is not equipped with a large amount of instrumentation. This is intended to promote the use of service gauges and hand held thermometers that the students will have to use in everyday maintenance work.

The 808 is equipped with a high pressure and low pressure gauge for convenience and demonstrates the use of both an air cooled and /or a water cooled condenser and the use of reverse cycle operation for both evaporator defrosting and reversible air conditioning(heat pumps).

The components are clearly laid out on a sheet metal panel for ease of visual understanding by students. There are a number of hand valves on the unit that allow isolation of parts of the circuit and the selection of 4 different types of expansion device. Two different evaporators are fitted, one is a typical forced (fan driven) evaporator and the other uses natural convection.

A suction pressure regulator allows students to see the use of two evaporators, on one compressor, with the evaporators operating at different pressures (and hence temperatures). This is achieved with the use of a suction pressure regulator on the forced air evaporator.

This manual is written primarily for use by the instructor who, it is assumed, is familiar with the aspects of refrigeration that is being demonstrated. The manual gives details of the components of the 808 operation of the unit and suggested demonstration procedures. However it is not written to be read in isolation by the students as a self contained teaching manual.