Question about Heating & Cooling

3 Answers

Central air system notworking

Thermostat ok at least for heating. Signal goes to condensingunit and blower turns on. Need info on checking electric circuitry at condensing unit.

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  • caleb470 Jun 14, 2009

    I need an expert who knows about Trane Home air conditioners. Model TTR742A100AO.

  • caleb470 Jun 14, 2009

    Dou know how to add refrigerant to a TRANE condensing unit ?

  • caleb470 Jun 14, 2009

    I wish to add refrigerant to my TRANE home central air condensing unit. Please do not reply unless you have the experience to do so.

    Thank you.

  • caleb470 Jun 14, 2009

    james, ty. are gage manifolds rentable? Should this be done at the condensing unit?





































































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You will need gages and temp meter to add refrigerant plus R22. Flare cap on large is the suction low side line. Put low side gage on there. Start unit .Your suction pressure should read about 70 to 75 if the house is very warm. Add refrigerant until this pressure is reached. You need to read the temp of the large line. It should not be below about 54 degrees. Normally. If you have not done this before be very careful to much freon will damage compressor. You have a leak somewhere if you have to add gas. Make a note of how much you add and when. Gives a base line to go by. Rusty

Posted on Jun 14, 2009

  • James Stopp
    James Stopp Jun 14, 2009

    You may be able to rent the gages at a Tool rental store but the refrigerant is another problem. You have to have EPA card to buy R22. But if you know someone who has some use it.

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Hi,,

Here are more details in addition to the prior techs articles.

www.fsec.ucf.edu/.../FSEC-CR-1044-98/pvres2.htm

Thanks

Posted on Jun 14, 2009

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Hi,

Please check this article. It gives a fair idea about the cirfuitry.

www.flagshipmarine.com/chiller.html

For a more techinical know this would be best:

www.miata.net/garage/CoolingSystemProblems.html

Ask Manualfox.com - it is a personal Document Search Service for electronic user, service manuals and drivers. They help you to save time and money by finding your needed product information.
Thanks for contacting Fixya

Posted on Jun 14, 2009

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3 Answers

My Goodman heat pump doesn't blow air through the vents into the house, but the fan comes on when the thermostat is turn on for the air conditioning


Check first that
  • the air conditioning equipment is turned on,
  • the thermostat is calling for cooling, and that
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Here are the details of what to check in what order if your air condtioner or heat pump doesn't start at all when you set the room thermostat to call for cooling:
  1. Check the Room Thermostat Temperature Setting: Set the thermostat to at least 5 degrees below room temperature. Our elderly mom has no patience with switches and controls. She regularly calls her air conditioning service company with a service request, sometimes late at night, because she has simply failed to set the temperature on the thermostat lower than the room temperature. Don't drive your A/C like our mother.
  2. Check that the Room Thermostat is set to "Cool" not "Off" or "Heat". If the thermostat is not set to "cool" it is simply turning off your A/C. If the thermostat display is blank then it's not receiving power (for modern digital thermostats). Check that electrical power is on at the air handler and to the the low-voltage transformer that supplies power to the thermostat.

    If the thermostat has power, check that when you set the thermostat temperature down at least 5 degrees below room temperature the thermostat calls for cooling. If it doesn't then check for broken or shorted thermostat wires anywhere between the wall thermostat and the control board at the air handler.

    You can easily eliminate possible thermostat problems as a cause of failure of the air conditioner to start by simply eliminating the thermostat from the picture: disconnect the thermostat wires at the blower unit's control board and instead connect the two thermostat terminals directly together with a jumper wire. If the system starts then the problem is in the thermostat itself or in its wiring.

    If the thermostat is working but the compressor condenser unit won't start, you could skip ahead
    to COMPRESSOR / CONDENSER DIAGNOSTICS but I wish you'd double check the remaining steps in this article first because there are some sneaky snafus listed below that might still be the problem.

  3. Check that electricity is on for the equipment. Check all of the electrical switches and controls that can turn electrical power off at the indoor air handler or at the outdoor compressor/condenser unit. There are more of these switches than you might guess. Here's a list of what to check:

    Electrical power switches and service switches outside by the compressor, inside at the air handler, and fuses or circuit breakers in the electrical panel. Don't forget to check that the access covers to the equipment are properly closed and latched. Otherwise a
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    There are several other safety switches and controls, both manual and automatic that can leave an air conditioner or heat pump turned "off" such as a blower compartment door interlock safety switch, an electric motor overload or overheat switches, and a condensate tray spillage detector switch.

    Some hard-to-find electrical switches on an air conditioner or heat pump could be keeping your air conditioner from starting, such as
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    causing CONDENSATE PAN SWITCH LOCKOUT - condensate spilling into an overflow pan that uses a sensor switch can be enough to shut down your air conditioner.
    or
    a blower MOTOR OVERLOAD RESET SWITCH could be keeping a fan motor from starting.

    A bad or failed starter capacitor could also be leaving your system shut down, failing to start a blower, fan, or compressor motor.
    See CAPACITORS for HARD STARTING MOTORS

    Watch out: See A/C - HEAT PUMP CONTROLS & SWITCHES to be sure you have found and checked everymanual or automatic electrical switch on the system.
  4. Check the electrical supply voltage. Even if electricity is on, if the supply voltage has fallen too far below the operating voltage range of your air conditioner it's likely that the system will not operate, particlarly, you may note that the compressor motor won't start.
    See VOLTS MEASUREMENT METHODS

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