Pentair Compool® Control LX820 Emergency Shut-Off Controller/Power Center. The Compool LX820 controller makes it easy and economical to enhance the safety of commercial spas. In the event of an emergency, pushing the mushroom-style button stops all spa equipment. This action shuts off the filter and up to two jet pumps, while sounding an alarm. Pulling the emergency button back out cancels the alarm, and returns the pumps to normal operation. Also important, the emergency shut-off switch and spring-wound timer operate on low voltage, effectively avoiding the risk of electrical shock. The LX820 controller can be quickly retrofitted to almost any commercial spa. The existing conduit for the spring-wound timer is used to bring the wires to the emergency shut-off switch. Simply use the old wires inside the conduit to pull a new 4-conductor low voltage cable. A new bell box is then installed above the spring-wound timer, and a short piece of conduit interconnects the two boxes. At the equipment pad, wiring the filter and jet pumps to the power center completes the installation. For spas with two jet pumps, an optional relay kit is added to the system. The two jet pumps can be wired together, or an additional spring-wound timer may be installed for the second pump. Unlike units created from multiple parts, the LX820 controller has a very professional look, and is UL Listed as a complete system.