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How to wire a raa20 siemens thermostat - Air Conditioners

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I have got the diagram for you,but cant send it here,give me a e-mail where i can send it for you.

Waiting your reply

Posted on Sep 10, 2008

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SOURCE: Siemens RAA20 2-wire installation

Please provide more information on you problem. Thank you.
Roger

Posted on Apr 03, 2011

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My air conditioner thermostat keeps losing power


The power for thermostat come to an from the thermostat with the red and common wire. Check for proper connection to thermostat and check thermostat wire from the thermostat to the air handler. Technicians sometimes do not install splices well and sometimes the splices comes loose. I prefer using rtv loaded wire nuts to make splices when I can find them. Another cause for this problem is bad insulation on thermostat wire allowing wire to short out. If this is your problem, you need to replace the thermostat wire itself. If these do not fix your problem, you may need to replace the thermostat itself.
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Assuming this is a standard unit the thermostat connections you will use: Y, R, G, W and possibly C.

Run two conductor thermostat wire to the condenser. The condenser will have two wires to connect. Connect the two conductors to the condenser wires and run them in to the air handler.

At the air handler, connect the two condenser wires to: Y (yellow) and C

Run 4 or 5 conductor thermostat wire from the air handler to the thermostat. At the thermostat, connect the yellow wire to Y, the white wire to W, the green wire to g, and the red wire to r.

At the air handler, connect the thermostat wires: White to w1, yellow to Y, green to G, and red to R

*Y will now be connected to the thermostat and the condenser
*If you have 5 conductor wire to the thermostat, connect the last wire (which is probably blue) to C
At the air handler, connect the last wire (blue) to C. This will enable you to have 24 volts at the thermostat in case the thermostat actually requires 24 volts to operate it.

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1 Answer

Siemens RAA20 2-wire installation


Please provide more information on you problem. Thank you.
Roger

Apr 03, 2011 | Air Conditioners

1 Answer

WE HAVE A HONEYWELL THERMOSTAT FOR USE WITH THIS BOILER. IT HAS FAILED AND THE WHOLE APPARATUS IS DEAD. THE INSTALLER IS AWAY ON HOLIDAY. CAN YOU SAY WHICH STAT OF ANOTHER MAKE - POSSIBLY SIEMENS-...


If the boiler has a 24 volt thermostat system, it may not be the thermostat that has failed. It may be the 24 volt inline transformer that's failed. To find out, you will need a circuit tester to make sure power is getting from the transformer to the thermostat. This way, you will know what needs to be replaced.

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