Operation

Theory of Operation

The design of the washer-extractor emphasizes performance reliability and long service life. The cylinder, shell, and main body panels are fabricated of stainless steel.

Electrical controls for the washer-extractor are housed in separate enclosures. The front control module houses the WE-6 computer, the fuse/relay board together with its interface board, water level switches, a circuit breaker which interrupts control voltage, and other control components. The rear control module houses the AC inverter drive and its components.

All variable-speed freestanding machines use the AC inverter drive control, which provides programmable motor speeds using a single motor. The AC drive interface board converts motor logic from the WE-6 computer to the correct signals for the AC inverter drive. In addition, all logic inputs to the computer are routed through this board.

Two separate bearings support the cylinder on 135-pound and 250-pound models.

The cylinder is constructed with four lifters or ribs that lift the laundry from the bath solution when the cylinder rotates at slow speed and then allow the laundry to tumble back into the bath. This mechanical action accomplishes the washing function. The cylinder is perforated, allowing the water to drain from within during the wash and extract steps.

On 135-pound capacity models, water enters the machine through electromechanical water valves. On 250-pound capacity models, water enters the machine through pneumatic water valves on the rear of the machine. (Pneumatic water valves are an option on 135-pound capacity models.)

Water valves on both washer-extractors are controlled by the microcomputer. The microcomputer also controls the drain and door lock. In addition, it selects the water levels according to the programmed cycle. Vacuum breakers are installed in the water-inlet plumbing to prevent backflow of water.

Air-operated drain valves hold water in the machine during the wash, soak, and rinse steps. The drain valve is normally open, which means that it closes only when air is applied, thus allowing the machine to drain in the event of a power failure.

A door-lock system prevents opening of the stainless steel door when a cycle is in progress. It also prevents operation of the washer-extractor when the door is open.

The doorbox contains the Hall-effect door-locked and door-closed sensors and the door unlock solenoid.

The stainless steel supply dispenser is located on the left side panel of the washer-extractor, viewed from the front. The dispenser has five supply compartments, numbered 1 – 5, starting from the rear of the machine. The compartments hold supply cups that are used for either liquid or dry supplies. A nozzle flushes supplies from the cups with water for the time programmed in the cycle.

Liquid supplies can be injected directly into the cups by a customer-supplied external chemical supply system. On 135-pound capacity models, five hose barbs on the rear of the washer-extractor facilitate connection to an external supply system. On

250-pound capacity models, five strain reliefs on top of the supply dispenser provide the same connection capability.

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