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Advanced Training Unit for Fault Location is mounted on a wheeled steel frame with stainless steel base and back panels and incorporates:- A Semi-Hermetic compressor 0.37 kW nominal duty, Air cooled Condenser with aluminium finned, copper coil; two display-case evaporators. Aluminium finned, copper coils with hot gas defrosting; a liquid receiver; 2 thermostatic expansion valves; Low and high-pressure control, evaporator pressure control, capacity control, thermostatic control, condensing pressure control and crankcase pressure control, low pressure switch, high pressure switch.
For student practice up to 25 refrigeration and electrical faults may be introduced into the system. Advanced Training Unit for Fault Location is constructed entirely from standard commercial components, including all of the necessary primary and safety controls and will give students valuable experience of system adjustment and fault finding on a multi-evaporator three phase refrigeration system.
A small microphone may be moved axially along the tube and Acoustic Impedence Tube position measured. The loudspeakers are fed with a common pure tone from a function generator and the sound waves pass along the tube to the sample. The Acoustic Impedence Tube consists of a transparent plastic tube fitted at one end with a glass reinforced plastic enclosure containing two loudspeakers and at the other with a heavy sample holder. The portion absorbed being converted into heat by the viscous action of the airborne wave as Acoustic Impedence Tube passes through the absorber. Dependent upon the type of material and the tone frequency, a portion of the sound energy is absorbed and the remainder is reflected back along the tube.
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Water Chiller Trainer Unit Instrumentation includes condenser and suction pressure gauges, evaporator pressure (service gauge), multi point digital temperature indicator with selector switch, evaporator and condenser flow rate measurement, optional refrigerant flow meter and optional computerised data acquisition system for all parameters including compressor current.
A pump circulates the cooled water at an adjustable flow rate through a tank with individually switched heaters that load the refrigeration system. Water Chiller Trainer Unit is mounted on a steel frame with stainless steel panels and comprises an hermetic compressor with water cooled condenser, liquid receiver, water cooling evaporator with adjustable pressure regulator.
Designed for single phase operation the demonstration case is divided into two main boards:-
Control board with programmable controller and normal Run/Fault switches and indicator lamps.
Mimic Diagram with Cooling and Heating sections and room temperature and humidity potentiometers.
Automotive Air Conditioning Trainer a complete vehicle air conditioning system mounted on a stainless steel frame and fitted with standard manifold gauge connections.
The unit consists of :- An Electric Motor nominal 1500rpm with overload cut out; Evaporator fitted with three speed 12 dc fan and Thermostatic Expansion Valve; Electronic thermostat, adjustable for temperature control; Five cylinder belt driven automotive compressor; Air cooled condenser and fan with 12v dc motor; Electrical control box with key locked emergency of button, on off switch, ignition key and residual current device; Transformer to provide 12v automotive control circuit; Four switch controlled fault conditions, including:- Blocked Thermostatic Expansion valve; Compressor Fault; Blocked drier; Poor condensing.
Commercial Refrigeration Training Unit the powder coated evaporator is a forced air, blow through type with removable front panel and galvanised sheet steel casing. Commercial Refrigeration Training Unit consists of an air cooled condensing unit with high back pressure, high starting torque hermetic compressor, Complete with: Suction and Discharge Service Valves; Gauge Manifold Connections and Built in Motor Protector. The evaporator is a finned coil type with fins a 5 fins per inch.
Commercial Refrigeration Training Unit unit may be thermally loaded for performance investigation and has a dial thermometer; Liquid Line Filter Drier; Liquid-vapour Heat Exchanger; High Pressure Switch; Low Pressure Switch; Internally equalised Thermostatic Expansion Valve; High Pressure gauge; Low pressure Compound gauge.
A dedicated Hermetic Refrigeration Training Unit with a capillary flow control and a range of switch activated faults for student practice.
The unit includes: Fan cooled Hermetic Refrigeration Training Unit condensing unit with high starting torque compressor; Front mounted evaporator with suction accumulator; Liquid line dryer; Compound and Pressure gauges
Using the push button switches, five system faults can be introduced into the system: Faulty compressor valve; Choked capillary; Excess discharge pressure; Overcharged system; Undercharged system.
Visual Refrigeration Training Unit operates on refrigerant. An electrical control box is mounted on the back panel and includes indicators/warning lamp, on/off contactor and overload, as well as residual current device for protection against earth leakage. Visual Refrigeration Training Unit comprise an air-cooled condensing unit with open type twin cylinder reciprocating compressor and a transparent plastic evaporator, clearly showing change of state of refrigerant from liquid to vapour phase. The unit also incorporates, Liquid/suction heat exchanger, Liquid line filter drier and sight glass, HP/LP switches, Compound and pressure gauges, Suction and discharge service valves fitted, Liquid line hand wheel valve fitted for easy manual pump down of system. The following refrigerant flow control options may be selected by the use of hand wheel valves: Automatic Expansion Valve; Thermostatic Expansion Valve, Internally equalised; Capillary with Separate Filter Drier.
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Advanced Refrigeration Training Unit is a multiple circuit unit, incorporating important secondary controls, is constructed entirely from standard commercial components and will give the student invaluable experience in fault diagnosis, system adjustment and replacement of faulty components.
The Advanced Refrigeration Training Unit is a fully operational, small scale cold room, which enables the student to relate all test results, system faults and adjustments directly to situations encountered in service and maintenance.
Basic Installation Training Package Unit may be thermally loaded for performance investigation and has a dial thermometer, Internally equalised Thermostatic Expansion Valve; High Pressure Switch; Low Pressure Switch; Liquid Line Filter Drier; Liquid-vapour Heat Exchanger; High Pressure gauge; Low pressure Compound gauge.
Basic Installation Training Package Unit consists of an air cooled condensing unit with high back pressure, high starting torque hermetic compressor, Complete with: Suction and Discharge Service Valves; Gauge Manifold Connections and Built in Motor Protector.
The evaporator is a finned coil type with fins a 5 fins per inch. Basic Installation Training Package Unit powder coated evaporator is a forced air, blow through type with removable front panel and galvanised sheet steel casing.
The hermetic condensing Reverse Cycle Refrigeration and Air Con Training Unit has a high starting torque motor with built-in winding protector, air-cooled condenser and liquid receiver. Reverse Cycle Refrigeration and Air Con Training Unit unit demonstrates both refrigeration and air conditioning principles as well as operation of two evaporators on one compressor by means of an evaporator pressure regulator. These comprise: Automatic expansion valve; internal equalised thermostatic expansion valve; External equalised thermostatic expansion valve. and Capillary tube with separate filter drier. A water cooled condenser is provided with an automatic condenser pressure regulator. Both the forced air evaporator and the static evaporator has a 3/8 O.D. copper tube coil block with aluminium fins. The Flow Controls may be selected by hand valves.
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An electrically driven ammonia-water Absorption Refrigeration Demonstrator with insulated chiller compartment. All major components of the refrigeration system: generator, absorber, condenser and reservoir are visible.
Digital wattmeter to give instantaneous indication of generator heater input and evaporator load.
Variable electrical load inside the freezer compartment
Variable generator heater.
Instrumentation:
Digital temperature indicator
Optional Computerised Data Acquisition System.
A storage case contains all the elements of the Check Valve Assembly, and the technical drawings, list of parts and instruction manual give the student all the necessary tools to assemble the valve, and the operate the valve afterwards. The Check Valve Assembly is designed for the students to become familiar with the assembly, functionality and operation of an industry standard check valve.
Experimental Capabilities:
Disassembly of check valve.
Reading and understanding technical drawings.
Assembly of industry standard check valve.
Fire Alarm Trainer activates the detector and sets off the alarm system. The case has an internal divider and separate heater lamps designed to raise the temperature within the enclosure above the detector limits. A two zone Fire Alarm Trainer control panel to Fire Alarm Trainer is mounted on the front of a glass reinforced plastic panel. One detector zone consists of a temperature detector and rate of rise temperature detector mounted in a fire retardant glass reinforced plastic case.
Apertures at the base of the box allow combustion products from a match or lighter or visible smoke from the generator supplied to be injected into the enclosure housing the two types of detector. The second detector circuit consists of a manual call point followed by an optical smoke detector and ionised particle detector mounted in a similar box to the heat detectors.
