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Need help with electrical for Armstrong 3.5 Ton 16 SEER

I have just had an Armstrong 3.5 Ton 16 SEER R-410a system installed but I don't think the second stage is coming on. I am using a Honeywell FocusPRO TH6000 series thermostat, a 4SCU16LT series outdoor unit and a R Series variable speed airhanler. The system calls for 19.0 Amps RLA but but the Amprobe only measures 6.6 Amps. The system cools but I want to ensure that the system is configured corectly. Please advise what the correct wiring should be from the thermostat to airhandler and compressor unit.

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  • ian4926 Jun 23, 2009

    Richard, thanks for your quick response. The airhandler model # is RVME36636S002.

    Response to your questions/points:

    1) You are correct on the unit being a 3 Ton (my mistake).

    2) Taking reading on L1 or L2 at the compressor.

    3) I didn't check the temps at the grills but the thermostat was set on 72F and indcating a room temp of 78 and the outside temp was about 87F

    Thanks again.

  • Richard Johnson PE
    Richard Johnson PE May 11, 2010

    1st: Your condensing unit is 3 Ton not 3.5; Armstrong only makes that line in 2, 3, 4, and 5 ton, not halve sizes. Also, 3 Ton is rated at 19 FLA.

    2nd: Which wire and from what location are you getting your amprobe reading?

    3rd: What is the temperature in the home, both supply air temp, return air temp and outside air temperatures? during this amprobe reading?

    It may be a case of the unit only operating at 1 stage due to load conditions. But per my previous post, give me exact model numbers of both condensing unit, and air handler and I will post complete wiring diagrams on a page within my company website and post the link here so you can review them and print them as necessary.



  • Richard Johnson PE
    Richard Johnson PE May 11, 2010

    What is the exact model number of the air handler? After you provide that, I will post a link to my company website with the complete wiring diagram for you to print.





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Next item: What is the exact model of the thermostat? It should consist of TH6###?#### where the "#" are numbers, and the "?" is a letter. And also you can check the following:

1. Remove the thermostat by gently pulling straight out from the wall to remove it from the sub base and tell me is you have 1 or 2 terminal blocks on the sub base. This will tell me if your thermostat is a 1 stage cool or 2 stage cool thermostat.

2. Check the air handler low voltace connections and check that the wiring is connected to both Y1 and Y2 and that these wires are connected to Y1 and Y2 at the condensing unit.

It may be the case of not connecting the condensing unit 2nd stage wiring, the thermostat is only 1 stage cool, or some similiar wiring mishap. Have seen it many times over the years. People get in a hurry and forget the small things. But if this was professionally installed, you paid a good price, if you find that the wiring is incorrect or the themostat is wrong, you should call your installing contractor and demand they return to correct this issue to maintain your factory warranty. If you have any addtional questions, or concerns or need help with any of the above, you can contact me again through here or via my company website at .


Posted on Jun 23, 2009


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