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Ronald Hall Posted on Dec 31, 2018

Honeywell thermostat rlv3150 2lines which one is load and which one is line

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  • Posted on Dec 31, 2018
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What colour are the lines?

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The VisionPro thermostat line has quickly become one of the leading digital programmable thermostats on the market to today. The ease of programming this thermostat and the touch screen interface has made it a very popular choice for many people. There is a variation of this thermostat for virtually any possibility that you can think of. The FocusPro line also is a very good choice at a bit less cost. There is a basic Pro line and also even a digital thermostat in the traditional round configuration. Both digital programmable and basic digital thermostats are available for line voltage control of electric heating.

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http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations
on Jan 15, 2010 • Heating & Cooling
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I am installing a new thermostat for my baseboard electric heat. The electric box has 2 wires comming into it. So I have 2 black, 2 white and 2 ground. The old thermostat had a place for all 4 wires (one...

One wire is "IN" the other is "OUT" A Thermostat works by "Breaking" the "Phase" line. It is just that simple. You usually have a pair of wires that connects, on the "Hot" side, to the always power ON line, & neutral. The Circuit, or Load, on the "Cold" side, has a a pair of contacts that open & close depending on Thermostat, in series with that conductor. Hot Contacts Cold P In-------------------><-----------------P Out
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Thermostat installation

On paul 306, I don't have any info on you're system, but the old thermostat that has the smaller wires with the colors you described is a low voltage (24volt) controls. The new one you purchased sounds like it is for a system that is made for line voltage (120 volts or more) connecting this to the unit may have bad results. This also may apply to GUEST.
COACOOCHEE, the white and black coming into the box is the line, even though white should not be used for line, the connections for the other side of the thermostat is the load. The new thermostat you have be a single pole break as opposed to the old one may be a double pole. You should have a meter to check the voltage coming into the box, it may be 120 or 220 depending on what you have. Without any more info I cant be sure, but you may be able to connect the black wires to the switch and the white together. But it would be wise to test with a meter to be sure before doing this.
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