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Old 11-06-2008, 12:33 PM   #1
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What do DC wires look like (colors)?


I got a solenoid valve that came with a kit I purchased and the instructions are EXTREMELY generic, this solenoid can come in about 20 different configurations and the instructions only show a generic picture. It can come in 240V AC, 120V AC, 24V DC, Plug in, and/or hard wired. It has 2 red wires, and 1 green wire coming out of it. The model# on the box does not seem to match what's inside (as the model on the box says 120V AC but... I can't see that being the case with 2 red wires and a green).

Am I correct this is DC (since every AC I've dealt with has black/white/green and NEVER 2 reds)?

To wire it, if this is the DC model I need to get a 24V transformer then each "red" wire would go to it's own screw terminal, the green ground of the transformer?

Make any sense? Another hint is, this is for a heating system which I believe it's standard for heating systems to be 24V. Thanks!


Last edited by Piedmont; 11-06-2008 at 12:40 PM.
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Old 11-06-2008, 01:22 PM   #2
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What do DC wires look like (colors)?


Generally red is positive, black is negative on DC systems. If there are two reds then my guess is that either can positive and the solenoid will work with either polarity. The green would more than likely be ground and is meant to be grounded to the chassis of the furnace unit.

Most components on HVAC are either 24vdc, 120vac or 240vac. The solenoids and transformers are 24vdc.

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Old 11-06-2008, 01:35 PM   #3
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What do DC wires look like (colors)?


Colour of the wires mean NOTHING. Look for a label on the solenoid. It should be marked with the voltage.
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Old 11-06-2008, 02:35 PM   #4
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What do DC wires look like (colors)?


I'll check Joed, I've probably spent 3 hours looking at the solenoid, box & instructions trying to locate the voltage I would likely have noticed the solenoid saying such but... will check again when I get home tonight.
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Old 11-06-2008, 03:01 PM   #5
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What do DC wires look like (colors)?


Then the model number on the box says it's 120 volts. I say it's 120 volts. Like I said you can tell nothing from the wire colours. Two reds are power wires and green is ground wire. Black and white is only for the cable. Devices could be almost anything. two red or two black would certainly be common colours for this device.
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Old 11-06-2008, 07:17 PM   #6
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What do DC wires look like (colors)?


"Red Hat" solenoid valves are what I have been installing, and the 120 volt version (and probably all versions) come with 2 reds and a green. Polarity doesn't matter. If you would like I can check the resistance of the coil on the 120 volt version and if it is close to yours, yours should be 120 volt.

Although if the box says 120v, it probably is.
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Old 11-07-2008, 02:28 PM   #7
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What do DC wires look like (colors)?


Take the actual coil out of the metal enclosure, thats where the voltage is described.

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