how to distinguish non color coder tstat wire

[NCSteve]

I Was Wondering If Someone Could Answer A Question For Me, If I Am Changing A Thermostat On A Heat Pump And All The Wires Are Purple Hypothetically Speaking How Do I Distinguish What Is What.

[freddy-b]

a meter

[NCSteve]

someone told me i can ground a wire but i cant seem to understand

[freddy-b]

Dude' if you are serious, I think you dont need to be around electricity of any voltage.

[dapper]

If you are changing the Trane weathertron t'stat be very careful. It's been a long time but, some versions had a resistor built into the y2? circuit. The y2? circuit in the board in the unit was designed for 12 volts, all others are 24 volts. If you replace this stat with a standard stat you will fry the board. I beleive it was a 4.7k ohm resistor in series with the circuit.

Could be the y1 circuit. Look for the resistor wired in behind the mercury bulbs.

[Airmechanical]

I Was Wondering If Someone Could Answer A Question For Me, If I Am Changing A Thermostat On A Heat Pump And All The Wires Are Purple Hypothetically Speaking How Do I Distinguish What Is What.


you must first get your eyes checked! :eek:

if that don't work ohm them wires out!



.

[keepitsimplestupid]

I worked on an X-ray set once and all the wires were black. Same thing happens with motors. Look carefully for numbers and/or markings on the wire.

If that fails use a wire identifier and/or toner.

[wen-sar]

take any 2 wires at one end.. attach a meter set to ohms..
now at the other end start twisting wires together (2 at a time) until you get a reading.. label those #1 and #2 at both ends.. now separate those wires and take #1 only and twist it with any unlabeled wires (1 at a time) until you get a reading again.. follow that procedure until all wires are labeled.. keep increasing the label each time.. #3, #4, etc.. make sure you double-check that first set of wires so you labeled the first set correctly at both ends.. wouldn't want one end labeled 1 and the other end labeled 2 would you.. you can just use wire #3 for that.. in other words once you labeled wire #1 and #2 separate them.. now use #1 and #3 wired together at one end and the meter at the other end should read checking wires #1 and #3.. if not you probably labeled the #1 and #2 backwards at one end..

pretty easy huh..

:D