If only 240V is available

240V Control Box

240V Control Box

If only 240V power is available, then you can use two elements and use them either independently or both together, either in parallel or in series.

A different type of control box is needed, as with 240V it is safe to plug into just one wall socket. The diagram shows two heater elements connected to a control box, which is in turn plugged into the 240V power supply wall socket. There are just three switches: a simple ON/OFF switch for each of the elements, switches A and B, and a DPDT switch to change from parallel to series operation, switch C.

By using two different sized heater elements, you can achieve a range of different power settings. One useful design uses 1000W and 2000W elements. These give you the following selection of powers: 667W, 1000W, 2000W, and 3000W off a 240V, 15 amp power supply. You might like to explore other combinations using the basic electrical relationships we gave above, but always remember to check the current by dividing the wattage by the supply voltage. Any combination larger than 3500W requires at least a 20 amp circuit.

Again, we've designed an alternative to switches, so you have a choice. 240V Jumper Plug Box

Fig. 7-16
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