There is no suspension system nor balance system in this machine and its simplicity makes it far more likely to successfully complete a cycle after years of sitting than a 29" model with the air-driven clutches in the tranny and the problem-plagued air pump.
The "off balance" switch in the 33" combos is activated by a bar that runs across the frame at the mounting of the pulley onto the drum shaft. An unbalanced load causes this bar to seesaw first against one side of the frame and then against the other side of the frame. If it rocks too much, it hits a pneumatic switch, knocking the air out of a little bellows. This trips the circuit to the little motor that winds up the chain which pulls up the pivoting portion of the variable sheave pulley. With its power interrupted, the motor lets the chain unwind, pulled down by the weight of the pulley. The drum returns to a tumble for about 15 seconds to redistribute the load as the bellows in the pneumatic switch refills with air, completing the circuit which allows the little motor to wind up the chain which pulls up the pivoting part of the pulley which increases the drum speed to the rip-roaring spin speed. Unfortunately, nothing in this process interrupts the power to the timer motor so the very short spin periods can time out if the load does not distribute to spin properly.
The exciting moment in this came when, initially, WP used too weak a cross bar. Instead of remaining rigid and seesawing back and forth, it flexed and did not trip the pneumatic switch. The machines which rock a bit during spin anyway, started walking. If undetected, they had plenty of time, especially during the final 4 minute spin to walk out of their position to the extent their power cords or water hoses allowed, sometimes blocking doors to utility rooms so that nobody could enter to free the laundry the machines held captive.
No substation will be needed since it is a gas-drying model.
