110V or 220V? For pumps which are hard-wired to a switch or to a breaker, they’re wired either 110V or 220V. Most aboveground pumps are 110V and most inground pumps are wired 220V, but not always. To find out your pump voltage, you possibly can compare the printed wiring diagram on the motor, with the wiring within the back of the motor. Or, you can look on the pump breaker, single pole breakers (about ¾?thick) are usually wired with just one 110V power wire. Double pole breakers (about 1.5?thick) are usually wired with two 110V power wires, to offer 220V total to the pump. Finally, you can test the two power wires on the motor or timeclock, to determine in case you have 110V or 220V running from the timeclock to the pump.
Digital or Mechanical? Mechanical time clocks are the standard pool timer, with the iconic yellow time dial – digital timeclocks came about in the late 90’s. Intermatic PE153 digital timers have some advantages over mechanical timers. You possibly can program up to three devices on one timer, and the Dual Voltage PE153 also accepts both 110V and 220V wiring, and works with both single-speed and two-speed pool pumps. It also has an optional freeze sensor to show the pumps on at low temperatures, and a battery backup saves current time and programs during power outages. With all those advantages, why do the T104 mechanical Intermatic timers still dominate the backyards of America? Perhaps because they’re easier to understand, and may be more durable in the outdoors.
Single Speed or Dual Speed? In case your pool or spa pump has two speeds, you should have four wires coming into the pump, instead of the standard 3-wire hook-up. The fourth wire is the low-speed wire, and a special timeclock mechanism is used, Intermatic T106M. Dual speed pumps may use the digital timer PE153, but cannot use the only speed T104 timer clocks.
Aboveground or Inground? As mentioned previously, most aboveground pool pumps are powered with 110V (aka 115V, 120V), and require a 110V time clock. The Intermatic 110V timer fits the bill perfectly for a hard-wired system using flexible or rigid wire conduit from timeclock to the pump. If your aboveground pool pump has a 3-prong grounded power cord attached, you can even make use of our economy 24-hour timer clock for aboveground pool and spa pumps, or outdoor lighting.