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Low voltage schematic for RHLL-HM2417JA

Low voltage connection from Air handler to condenser

Posted by shamaty on

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5 Related Answers

Anonymous

SOURCE: Low Voltage Wires - MSZ-A24NA Mr. Slim Heat pump

does the fan come on at all

Posted on Jan 13, 2007


Anonymous

  • 3 Answers

SOURCE: Carrier air handler tonnage?

That is a fairly large difference. It is usually ok to have the inside evap. coil and blower up to 1 ton larger than the outside condenser. That will make the unit slightly more efficient as well as less likely to freeze up on low airflow situations. It is not recommended to install a new condenser on an old evap coil. There has been a lot of changes to the design of the coils in the last little while. For example a 10 year old 2 ton coil may only have 3 cubic feet of volume but a new 2 ton coil may have 4 cubit feet of volume.

There are many factors that may have infulenced the decision on what size condenser to install. Many of which can only be done by visiting the home and doing alot of work, checking the duct sizing bioth supply and return, inspecting the insulation and windows of the home etc. etc. Most of the time that never gets done. You can blame the contractor for not doing a complete check, but at the same time you can blame the customer because many contractors that are that good loose the job to a cheaper bid that did not no any of the research. It is a catch 22 for everyone involved.

There is ALOT more to sizing equipment that many people think, sadly that also includes many HVAC contractors. Way too many people use "rule of thumbs" or flat out "guess".

Sorry for the rant but your queston can only be answered by a good well educated HVAC contractor visiting your home. That type of a contractor is getting hard to find these days in such a price competetive world.

Posted on Oct 14, 2008

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Anonymous

  • 1 Answer

SOURCE: Rheem Air Handler will not run

We tried to bypass at the Tstat. Thanks for your time and interest.

Posted on Apr 12, 2009

mike bare

  • 116 Answers

SOURCE: Need low voltage wiring diagram for condenser

look on the indoor unit and see what they do you hav common from trans former yellow for compressor white for elect heat then reversing valve usually orange green for fan on the out door unit board you can tell what is common and what is for heat

Posted on May 09, 2009

Anonymous

  • 1 Answer

SOURCE: problems with low voltage control wiring turning on cond. unit

hooked up white wire from condensing unit to (c) on furnace control board and ( red ) wire from condenser to (y) on furnace control board and could not get 24 volts out goodman condenser ! there is 24volts coming out of transformer! also good fuse in control board!

Posted on Jun 23, 2009

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1 Answer

Heat pump compressor/fan/air handler runs heat for 30 secs, then all stop. (Trane XR 11 HP w/honeywell T8411R thermostat). Capacitor good, new 5-2-1 hard-start kit added but didn't solve problem.


Sounds like low pressure. Are you losing low voltage to condenser? Backup heat not working likely due to a setting error or possibly a wiring issue.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Nov 14, 2016 | Heating & Cooling

1 Answer

Low to zero pressure on low side test port


150 is low for high side pressure. may have to add more r-22 to system. if you had a blockage high side pressure should be higher. have you turned both service valves at condensor ccw completely?

Apr 20, 2014 | Goodman CKL42AR42 Air Conditioner

1 Answer

My carrier programmablethermostat has no power


Check for power to the air handler.
If you have power there,check power on the low voltage side of the transformer in the air handler.
No low voltage out of the transformer is will need replacing.
There may also be a 3 to 5 amp fuse on the air handler control board that is blown.
Any auto motive fuse of the same size will replace it.

Apr 04, 2011 | Honeywell Heating & Cooling

1 Answer

Our Carrier central air is unresponsive, nothing at all, no noises, air handler and condenser unit will not turn on, please help me before I lose more weight in my 150 degree attic. The serial # for the...


I think you need to slow down and start fresh.
1) You have 115v at Transformer-You are reading from Red to White
on windings?

2) If that checked out OK are you reading 24v out of Transformer?
3) If yes, remove thermostat wires and put a jumper wire between
R and G. Put the Blower Door Back ON and turn on power
hopefully your fan will come on.

4) If the fan comes on, move the jumper between R and Y, put the
blower door back on and turn on power, indoor fan should come
on as well as the outdoor unit. If the happens you have a problem
with the low voltage wire being broke or a defective thermostat.

5) If none of the above happens and you do not have 24v Between
R and Y or R and G, but you have 24v on the secondary side
of the transformer, you have a defective control board.

Jul 20, 2010 | Heating & Cooling

1 Answer

Air Handler: I have two 24V supply lines one from the transformer the other, I think from the condenser fan. Both wires are connected to a relay which operates the indoor blower. When the 240V power supply...


you have 24 volts from the indoor thermo to the transformer in the air handler then 24volts from air handler to the contactor when this is energized it goes to 240 volts to run the compressor and outdoor fan. Sounds like the contactor is not enegizing check the voltage at the contactor. you should have a schematic to show you the voltage.

Jun 21, 2010 | Heating & Cooling

1 Answer

Air handler does not respond to thermostat


If you have high voltage power to the air handler you need to make sure there is a low voltage call to the air handler from the thermostat. sounds like the low voltage wiring is miswired.

Sep 13, 2009 | Heating & Cooling

1 Answer

My air conditioner won't turn on. When thermostat is set to cool, the furnace blower kicks on but the compressor and outdoor fan do not.


sounds like your not getting a low voltage signal to the condenser, if your Air handler is in the attic check your secondary drain pan it might be off on the float switch, if your air handler is in a closet you need to check your float switch, it will have some wires coming out of it. Hope that helps you get started.

Apr 26, 2009 | Goodman CKL42AR42 Air Conditioner

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