DO NOT hork this thing together like you have been aiming to do so far. Call an electrician, or learn proper wiring methods and fit your own box. I would say that is also true of the wall-wart transformer you really want.īut you don't really want a wall-wart transformer, you want this thing, hardwired in and installed to code. The key to this type is you let the thermostat wire do the traveling, you fit the transformer in a less finished utility space, crawlspace or basement where that makes sense. (or the electrician also could, obviously, and they're experienced at fishing wires through finished walls without wrecking drywall). You use thermostat cable to take the 24V wherever you need to go. Alternately, she can fit one of these boxes at an appropriate location, and then use listed wiring methods compliant with the Electrical Code to bring 120V mains power to the box.Īt that point, the electrician splices the transformer's 2 wires to mains power hardwired, fits the transformer as the box lid, tightens it down, and leaves. Now, if your basement is unfinished, there's likely to be one of these junction boxes somewhere, with handy circuits behind it your electrician can tap. The non-hazardous low voltage terminals are to be on the outside of the box. Code requires it be mounted with the AC power (black and white) wires on the inside, where they will splice to AC power wires also inside. 1 product rating - Sloan Valve EL-154 24-Volt Transformer For Optima And PWT Systems. As you can see, your transformer is made to be the lid of this. Sloan Valve EL-154 24-Volt Transformer For Optima And PWT Systems. In order to get 30+ volts you either have the wrong transformer, there is a slight short within the primary windings that actually parallell a few turns, or your meter is in need of calibration. They're so common Amazon doesn't practically sell them, since every hardware store and electrical supply stocks them for about a dollar. Even a 208v-24 transformer would only give you a 28.8v secondary if you applied 250v. Enter products like yours, which are designed to mount on standard 120/240V steel junction boxes, common as dirt in 120V wiring methods: However for thermostat wiring, the above is a silly product, because generally speaking thermostat wiring is a permanent part of the building, and there'd be no reason to make it pluggable, and a lot of reason not to. You're running smack into that right now. These cords use switching regulation, so they produce the stated voltage even when your outlet’s power or the power drawn by your device fluctuates. All components should be available at Radio Shack with the exception of the 1558 op-amp.In mains electrical, wiring methods are everything. Plug these adapter cords into a standard outlet and they change AC voltage to DC voltage. The 3 amp output is obtained using the center tap of the transformer with the switch in the 18 volt position. For three -phase equipment, use this formula to find power output: VA Volts × Amps × 1.73. The power transformer shown is a center tapped 25.2 volt AC / 2 amp unit that will provide regulated outputs of 24 volts at 0.7 amps, 15 volts at 2 amps, or 6 volts at 3 amps. For single -phase equipment, use this formula to find power output: VA Volts × Amps. The power transformer should be capable of the desired current while maintaining an input voltage at least 4 volts higher than the desired output, but not exceeding the maximum supply voltage of the op-amp under minimal load conditions. The maximum DC supply voltage for the 14 is 36 and 44 respectively. The 1458 may be substituted in the circuit below, but it is recommended the supply voltage to pin 8 be limited to 30 VDC, which can be accomplished by adding a 6.2 volt zener or 5.1 K resistor in series with pin 8. Voltage regulation is controlled by 1/2 of a 1558 or 1458 op-amp. The 2N3055 and 2N3053 transistors should be mounted on suitable heat sinks and the current sense resistor should be rated at 3 watts or more. This 3V to 24 volt variable-regulated power supply can be adjusted from 3 to 25 volts and is current limited to 2 amps as shown, but may be increased to 3 amps or more by selecting a smaller current sense resistor (0.3 ohm).
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