valutazioni - 2, GPA: 3.5
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Facilità d'uso
17 18 Mechanical system Evaporator disassembly 1. Press PURGE button to purge evaporator, and then turn power OFF. 2. Unscrew and remove stream divider as shown. 3. Unplug and remove gearmotor as shown. 4. Remove all traces of anti-seize compound or petrolgel from the auger shaft. 5. Unscrew and disconnect transport tube from louvered docking assembly. 6. Unplug sensor at the electrical box. 7. Remove vent tube from shuttle housing as shown. Fig. 13 Fig. 14 Fig. 15 19 8. Loosen nut on V-band clamp and remove. 9. Remove V-band clamp from front of evaporator. 10. Remove main housing as shown. 11. Remove and discard mating ring and seal. 12. Carefully remove auger. Fig. 16 Fig. 17 20 Lube with soap touch Do not Cardboard disc Fig. 19 3. Press new mating ring into main housing as shown. 4. Lube the shaft with liquid soap in the area shown and slip on seal and spring. Note: Do not touch the sealing surfaces. Use cardboard disk to install. Fig. 20 5. Reinstall main housing as shown. Evaporator reassembly Fig. 18 1. Remove and inspect O ring seal. Discard if damaged in any way. 2. Clean O ring groove. Lubricate O ring with petrolgel and reinstall. 21 Fig. 22 11. Reconnect transport tube to louvered docking assembly. 12. Plug sensor in at the electrical box. 13. Reconnect vent tube to the shuttle housing as shown. Apply petrol-gel Fig. 23 14. Apply a coat of petrol-gel compound to the auger shaft. 15. Install gearmotor, making sure that insulation is properly seated between gearmotor and main housing as shown. 16. Firmly tighten four gearmotor bolts in place. 17. Insert a bolt into the auger shaft and finger tighten. removed for clarity Note: Shuttle housing Fig. 21 6. Orient auger shaft with keyway in the upward position. 7. Force main housing into position against evaporator and place 1/4" (7mm) diameter Phillips screwdriver into hole in the auger shaft. 8. Replace V-band clamp as shown. 9. Replace nut on V-band clamp and tighten. 10. Remove screwdriver. 22 Fig. 25 20. Remove bolt and reinstall the washer and bolt. Place retainer over bolt and secure with nut and washer. Apply petrol-gel Fig. 26 21. Lubricate body of stream diverter with petrol-gel and reinstall. 22. Plug gearmotor power cord into electrical box. Fig. 24 18. Using a wrench, rotate the shaft clockwise to align the keyways in the gear housing and the shaft so as to accept the key. 19. Insert the key into the keyway. Refrigeration system Condenser unit operation The condensing unit is weatherproof and equipped to operate in ambient temperatures from – 2 0°F – 120°F (– 29°C – 48.9°C). The condensing unit is controlled by a dual pressure control which works in concert with a refrigerant solenoid valve on the evaporator module. On start-up, the refrigerant solenoid valve opens and suction pressure rises above the “on” set point of the control (30 psi). The compressor and fan turn on and the refrigeration system operates. Upon shut down, the refrigerant solenoid closes. The compressor will pump down the suction line until the low “off” set point is reached (10 psi), at which point the compressor and fan will turn off. Low ambient operation: Reliable operation at low ambient temperature is achieved with a pumpdown cycle, a crankcase heater and a head pressure control valve. As the ambient temperature falls and the head pressure decreases the valve maintains a minimum head pressure of 180 psi by bypassing discharge gas around the condenser to the receiver to increase the pressure at the condenser outlet. This backs liquid refrigerant up in the condenser to reduce the area available for condensing which increases the head pressure to maintain the 180 psi set point. A check valve is installed in the liquid line between the receiver and the condenser to prevent liquid migration from the receiver to the condenser during the off cycle. The crankcase heater works in conjunction with a continuous pumpdown cycle to prevent accumulation of liquid refrigerant in the compressor oil during the off cycle. This prevents compressor damage due to a flooded compressor start. The low pressure control will start the condensing unit anytime the low side pressure rises above the 30 psi set point and pump the refrigerant out until the pressure falls to 10 psi. The crankcase heater, which is energized whenever the condensing unit has power, keeps the compressor oil warmer than the coldest location in the system. This minimizes off cycle refrigerant migration. If power to the condensing unit is interrupted after the system is charged the compressor should not be started unless the crankcase heater has been energized for at least four hours immediately prior to compressor startup. However the compressor can safely be started during the refrigeration system charging process (without the warm-up period) once sufficient refrigerant is in the system to maintain a positive pressure on the suction side of the compressor. Refrigerant pressure data Air-cooled condensers (air) 60°F/16°C 7...
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