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    At one time Lennox heat pumps had what they...

    At one time Lennox heat pumps had what they called a "temperature compensating thermistor" installed in the outdoor unit which connected to the 'T' terminal on the stat. It was supposed to help the...
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    Humidity Control Options

    Hot gas reheat is an excellent way to control humidity but the owner should understand that there's an energy cost, it's expensive to operate a compressor for the long periods needed to control...
  3. Thread: Lennox LF24 45A

    by jm0711
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    Double check all wiring paying close attention to...

    Double check all wiring paying close attention to polarity on both low voltage and high voltage wiring. If the old board was faulty you probably have a mis-wiring problem -or- a different problem...
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    I started in the trade in 1984 as a helper. I...

    I started in the trade in 1984 as a helper.

    I have installed a handful of that style furnace, both oil fired and gas fired models. I LOVED those furnaces if for nothing else the erector set...
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    Zonex - Opinions?

    I am looking at options for replacing a Carrier/Parker VVT system. We are considering using Zonex. The job has nine zones on a 12-1/2 ton packaged rooftop in an office environment. Four of the...
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    Some ideas on how to get started: Go to every...

    Some ideas on how to get started:

    Go to every hvac shop in your area, small shops, large shops, one-man shops and have your resume in your hand. Ask to talk to the owner or the manager. Look the...
  7. I worked in the HVAC field for 24 years, and I am...

    I worked in the HVAC field for 24 years, and I am a licensed plumber. I changed careers 4 1/2 years ago and became the Director of Facilities for a public school district. Welcome to the field.
    ...
  8. Thread: 1974

    by jm0711
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    I live in a neighborhood that was built in the...

    I live in a neighborhood that was built in the 1960's.

    A couple of doors down there's a house with an American Standard condensing unit installed in 1969 by my father. The drain pan on the air...
  9. Thread: 60s what is it?

    by jm0711
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    2,453

    Bryant.

    Bryant.
  10. Thread: P3 duct

    by jm0711
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    I remember first seeing this stuff at an AHR show...

    I remember first seeing this stuff at an AHR show at the Javits center in NYC. It must have been 10+ years ago. A couple of Italian guys had a booth in a far corner of the show. It seemed like a...
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    To answer your original question....on that...

    To answer your original question....on that furnace the oem motor is the only one to use. Any other motor will fail quickly. I don't know what's so special about that motor or the design but an...
  12. This pilot cleaning pump is a real time saver. I...

    This pilot cleaning pump is a real time saver. I have used all the other methods mentioned here. I would never go out doing no-heat calls without this pump. You can pull the pilot tubing off the...
  13. Check the Owner's Manual

    [QUOTE=Surferman;14192661]I have a Fujitsu 15RLQ mini split located in a 1500 sq ft walk-out basement. I attempted to use it in "dry" mode this summer and it did not reduce humidity nor did it...
  14. Thread: Fujitsu 12RLQ

    by jm0711
    Replies
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    970

    Solved

    Update on the solution:

    This may help someone else in the future....
    -Wound up talking with tech support to get the resistance values on the coil for the exv. Fujitsu has come a long way with...
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    Lennox Not sure what exact model...

    Lennox

    Not sure what exact model though.......maybe HS-6
  16. Thread: Fujitsu 12RLQ

    by jm0711
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    970

    Thanks to both of you. I did weigh in the...

    Thanks to both of you. I did weigh in the charge.....and I will check the expansion valve for clicking and resistance.

    It sure seems like the exv is not opening.
  17. Thread: Fujitsu 12RLQ

    by jm0711
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    970

    Fujitsu 12RLQ

    I am at a loss to explain what's going on with this thing. When operating in test mode (cooling) I am getting a suction pressure of 60psi and no real cooling from the unit. When operating in normal...
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    Mystery Rooftop

    It could be an American Standard from the late 60's/early 70's?
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    As you noted, Lennox requires the installer to do...

    As you noted, Lennox requires the installer to do one of three things on an application where airflows of 2000 cfm are required: 1. install two return air drops into the sides 2. install return air...
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    Old Junk

    nope, that first picture was packaged from the factory. But they just took the split design of the day and backed it up to an air handling section.

    I have seen that Bryant unit too, and I had...
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    Carrier

    It's a carrier condensing unit of the era, mated to an air handling section and a horizontal to vertical transition box. Some of these used R500 (Carrene 7 <sp>) The transition box was often...
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    Carefully Check

    the plastic coupling between the motor and the damper. It is keyed to the motor shaft and could be stripped. It's not the spring. The spring closes the damper.
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    comp changes

    You mentioned compressor changes....if there has been multiple changes then one thing to consider is an excess amount of oil in the compresssor, brought back suddenly by the improved piping and...
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    Maple Chase is gone.....at least the name is. ...

    Maple Chase is gone.....at least the name is.

    The same stat was sold under the Robertshaw and Invensys names.

    You may be able to find manuals from their websites.

    I believe the 9700 is an...
  25. Take a look at ductless heat pumps. Some models...

    Take a look at ductless heat pumps. Some models qualify for the federal tax credit.
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    Week 17 - I owe a prize

    Despite my feeble attempts at playing the pool this year which resulted in a very poor showing......

    I owe someone a prixe for this week!!

    Send me an e-mail (find it in my profile) with your...
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    Fuel flow meter

    Flow meters are not a common item.

    Another option is a hour meter. If you know the nozzle size and the pump pressure you can calculate the oil consumption used by your burner in hours. Then it's...
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    I'm in as well

    I quietly played in this pool last year...

    I just signed up again. If you need a week covered for a prize just let me know.

    -Jared
  29. Thread: Lennox RTU

    by jm0711
    Replies
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    744

    Frank, Check your private messages.

    Frank, Check your private messages.
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    R-8 Wrap

    the 3" duct wrap is a pain in the neck to install and especially difficult to get it on there while looking decent.

    One item we use that makes it a bit easier is a product called Zip-Ez fasteners....
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    Mikman, I work in exactly the same way as you...

    Mikman, I work in exactly the same way as you describe...and I am 90 miles north of NYC.

    I got the hell out of NYC after college.....worked in Manhattan while going to college in the Bronx and...
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