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Wiring a thermostat.

Ruud heater model (-)HQA(-) five wires coming out of the unit. Two black labels G and W. One yellow wire coming from the 24v transformer. And one purple and one brown. Need to know how to wire just the heater without the air unit.

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The green one is for the evaporator fan motor relay. The white one is for the heat sequencer. The one coming out of the transformer is usually red BUT it will be the power so attach it to the terminal labeled R on the thermostat. If there is a RH and a RC, put a jumper in between them. See if the purple and brown ones go to the fan motor, if so, then just cap them off with wire nuts, and that should have your heat working. Check to make sure the green and white wires go to their designated areas (the heat sequencer looks like a stacked set of thermal overload switches and the relay looks like, well, a relay) and neither ground out before flipping on power or you will pop your transformer.

Posted on Jan 28, 2008

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Need to know full low voltage wiring information to thermostat


Usually the Red wire provides 24v and connects to the R termenal-
Next the Green wire is to the indoor blower motor and connects to G terminal-
Next the Yellow wire is to the outdoor unit to call for cooling and will engage power to the contactor solenoid to pass 240v power to compressor and power to Start/Run capacitor and fan! It will connect to the Y terminal-
Next is the White wire an it calls for Hea and is connected to the W terminal-
If you have an Orange wire it is for the reversing valve of a heat pump system.
Remember the red feeds 24v to each of these colored wires to complete a connection and pass power to the device being called into action.
BLue or Black wire will be ground if the thermostat needs power instead of batteries.

Red wire is the only hot 24v wire going to the thermostat period! And it comes from the Transformer!

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We are working on wiring a new S84-17 transformer fan control 40VA to our ancient Rheem furnace and had forgotten to label one of the wires. Trying to figure out if the yellow wire ties in with the upper...


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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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1 Answer

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If the transformer wires are shorted together, this will burn up the transformer. Normally transformers on the LV side (24 volt) are not grounded, but the solenoids that they control could be grounded, and a t-stat wire that is unintentionally grounded could burn up the transformer, but its not likely.

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Turn the power off to the air handler. Open the control cover. Write down what color wires go together at the wiring terminal. All 8 wires are probably not used.
Post the findings here.
In most cases,
E= brown-emergency heat
AUX=white-auxillary heat to supplement HP
Y= yellow-to compressor for heat or cool(hp)
G=green-indoor fan
O-orange-reversing valve on HP when energized in COOL
L=t-stat light(probably not used)
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B=black-reversing valve on HP when energized in HEAT
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Only one of the "O" or "B" will be used. Not both.

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Hopefully there are markings on the old t-stat as to what terminal is what.
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There should not be a bare wire, it probably just has the insulation stripped back way too far.
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170-7
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200-0
other parameters that I did not specify, you may read the manual and make your own decision but I recommend factory settings for the other parameters

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