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I have some wires that came off on the outside unit and I can't figure out what goes where???

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  • Perry Putnam
    Perry Putnam May 11, 2010

    What's the brand and model number for the unit and is it a heat pump or straight a/c?

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You have not said what model this is for. But as a rule, you have indoor to outdoor wiring, if you open the indoor unit they are labelled 1,2,3,4,5. The indoor wiring must correspond to the outdoor unit. So whatever is wired to 1 indoor must be same on outdoor.

Posted on Mar 10, 2009

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If the wire goes from the thermostat to the heat pump outside and has no connections in the air handler, then it is most likely 1 of 2 wires.

The first would be the reversing valve wire. This wire energizes the reversing valve at the appropriate time....either during a call for heat or cool.


The other would be an outdoor thermostat. Some much older thermostats and units had a "T" terminal that hooked to an outdoor thermistor. If that is the case, you can simply remove this wire from the set-up. The days of using an outdoor thermostat to control efficiency are long behind us.

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Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
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HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

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1 Answer

I need wiring manual for goodman mini split.


outside unit L1 and L2 are load (input 240vac)
then you have control voltage, usually yellow and blue (24vac) this connects to some 18/2 thermostat wire which goes inside as white and red.

note: this unit may only need 24v control which is 2 wires from the inside unit and also 3 wires 2 hot 1 ground for line voltage.

STANDARD WIRING
on the inside unit you have green, white, blue and red control wires.

on your thermostat you have white, red, yellow and green

you run the wire from the outside unit to the inside unit. then run a 18/4 wire to the thermostat if wired and join the following wires.

inside unit thermostat outside unit
green------------------------green
white-------------------------white
red----------------------------red
blue-------------------------------------------------------blue
yellow--------------------yellow

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CONNECT AC TO AIR HANDLER


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