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  1. What is % increase in load from an 85 degrees to 95 .

    If all things are the same considering a 100% sunny day what is the aproximate increase in load from 85-95 outside temperature??
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    Radius elbow on return drop..?

    I was told that installing an elbow on the bottom of the return drop can increase air flow 25% .. Rather then the end cap that you typically see ..has anyone tested this or improved cooling/airflow ...
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    Heat load calculation for windows

    Was wondering what the formula for heat gain calculation is for windows receiving direct sunlight..
  4. How much heat is produced running a couple of burners on kitchen stove

    Customer complained she had stat set at 69 and after she was done cooking the stat was up to 72 degrees.. It was located in adjoining room near kitchen..
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    Setting t stat at 69 degrees

    I told customer setting the stat this low is not a practical set point.. Since these systems are not designed maintain that kind of indoor temp.. Due tightness of duct system and home..
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    Honeywell 8000 thermostat fan on question

    I noticed that on a call for cooling when the fan is set to on about 10-15 seconds before the outdoor condenser starts the indoor fan motor hesitates or switches off for a quick second.. Is this the...
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    I think this is my issue described in this...

    I think this is my issue described in this article..When a compressor fails short, what happens is that insulation on the wires has worn off or burned off or broken inside the compressor. This allows...
  8. Welded contactor killed condenser fan motor

    Had a contactor get welded from loose wire on compressor .. Only had one leg that had continuity .. I believe this condition fried the condenser fan motor .. I changed the contactor and capacitor ...
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    Failed compressor winding test good

    Can the stator/rotor of compressor be shorted and still have continuity in the windings?
  10. Would an 8 year old compressor in a Westinghouse unit be under warranty?

    Would an 8 year old compressor in a Westinghouse unit be under warranty?
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    Went back and found burnt wires on the start and...

    Went back and found burnt wires on the start and common terminals of the compressor. I repaired and replaced the wires .i then tried to restart the unit.. Compressor would not start or do...
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    Could all this be caused bya loose wire on the...

    Could all this be caused bya loose wire on the circuit breaker..?
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    Would pulling Lra or losing a leg of power damage...

    Would pulling Lra or losing a leg of power damage or cause these issues .would this damagethe capacitor? Also the condenser fan motor was replaed a week ago after it was cycling on and off on thermal...
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    Common wire on compressor burnt

    Found a compressor with the common wire that had popped off the terminal and was a little burnt . The breaker had popped .. I replaced the wire and terminal and the unit ran fine for a couple weeks ....
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    I ran a little test .. I blocked off 75% of the...

    I ran a little test .. I blocked off 75% of the condenser with carboard and the amperage only moved from 1.6 up to 1.7 .. Dirty condensers make a miniscule difference inmho..
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    Thought fan motors have one rating unlike a ...

    Thought fan motors have one rating unlike a compressor.. With FLA and RLA distinction..
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    Amperage on condenser fan motor

    I installed a condenser fan motor that was running at 1.6 amps and was rated for 1.6 amps. Is this too close to rating ?? Should i be running slightly below rating on motor..?
  18. Should the customer be told the condenser is...

    Should the customer be told the condenser is destroyed if this condition occurs? Would a txv protect the system somewhat from slugging??
  19. If Blower motor quits is the compressor pumping liquid?

    Have always heard a small amount of refrigerant can wreck the compressor.. So on a residential split system when the blower quits and the outdoor condenser continues to run and ices up is that...
  20. Higher seer unit freeze in low ambiant conditions

    I noticed that some of the higher seer r 22 units do not really build up enough head pressure when the outdoor temp is in the 60 degree range to keep the suction above freezing.. Is this common?
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    Voltage across a capcitor on A/C

    Why is this voltage running 390 volts from herm to common on the cap? Is this even a worthwhile check ? When replacing an open capacitor what else should be checked to avoid a callback?
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    What size is this Lennox Condenser

    Model# HS18-311-4p
    Serial# 5885F03767
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    Is hvac for loners ?

    It gets old being by yourself on the roof or in a mechanical room all day ?
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    And the silence is deafeaning..

    And the silence is deafeaning..
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    Any Chicago union shops hiring techs??

    ??
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    Aleardy has a fuse.. Like i said the fuse did not...

    Aleardy has a fuse.. Like i said the fuse did not blow because the transformer burned out on the high vlotage side..
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    This is a trane residential furnace.. The low...

    This is a trane residential furnace.. The low voltage fuse was uneffected and did not burn out
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    Transformer burned out..

    Replaced a transformer that burned out on high voltage side and received a call back .. Going back there tomorrow .. What would you check first and how ?
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    Trane Voyager test Mode

    I was starting and checking a YCD Trane unit today in test mode .. It was about 48- 50 degrees ambient temp. I was just wondering why the second condenser fan did not activate in test mode . both...
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    Who gets stuck being on call

    Just wondering what kind of positions in this industry do not have to be on call?
  31. Anyone working 40 hours a week in Chicago this time of year??

    ??
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    I was wondering how big of a jump it would be on...

    I was wondering how big of a jump it would be on the technical side Coming from hvac with the typicall controls/systems that are in this environment.. ?
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    Maintenance technician in steel mill

    I saw a job posting for a job at a major steel producer in the midwest. I am kinda of sick of the lack of job stability in this business. Thinking a position at a mill would be steadier hours? As...
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    It was not a smoke detector...

    It was not a smoke detector...
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    York D1SS240G40017HPB

    Does anyone have schematic for this unit.. I was working on it today and I had 24 volts and a call for heat . the unit was dead in the water . I could not activate the fan by jumping r-g. Or jumping...
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    I do not believe a local union has the ability to...

    I do not believe a local union has the ability to pull tax records. They are not the f.B.I. They may request them at the time you retire. That does not mean you must disclose them . Many presidents...
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    The union job is mainly doing new construction...

    The union job is mainly doing new construction doing ventilation and duct work at a hospital expansion. When that job is complete if there not another project going i would be laid off.. The non...
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    Go back to union??

    I have been on and off work from the sheet metal workers union for the last four years.. I finally pulled the plug and landed a job with a commercial service contractor. The pay is about 25% less...
  39. Thread: drawing 9 volts

    by jmiles
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    drawing 9 volts

    I walked up to Carrier rtu today that was suspected of not having power. when I pushed the contacter in the compressor would start. When i tried jumping r-w or r-g or r-y Nothing would activate. I...
  40. Thread: Toke

    by jmiles
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    517

    Toke

    Anyone
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    well I got fired after 3 weeks for dropping the...

    well I got fired after 3 weeks for dropping the ball and calling for help on this unit .The boss told me he now needs someone who can work on 50 ton units. When he knew I was coming from residential...
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    It was 208/3

    It was 208/3
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    This unit had two transformers.. One was a normal...

    This unit had two transformers.. One was a normal 75va transformer which I was getting 24 volts from. There was also a second transformer that was massive in size that was giving me 14 volts that...
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    It was a regular stat.. The trouble light on the...

    It was a regular stat.. The trouble light on the main board was steadily glowing but the light on the ignition board would not illuminate..
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    12 ton trane voyager

    How much more difficult is it to troubleshoot a trane voyager rtu?? I don't have any experience with these units.. I was sent out to change an ignition board on one of these units that was diagnosed...
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    Employee rate vs. Hourly rate of contractor ?

    If a company charges $100 an hour as there rate no matter if you are working on a large chiller or a roof top unit.. Why don't all techs make $40 an hour?? I mean the guy changing a rtu compressor is...
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    Troubleshooting Lennox L series.

    Just wondering what the sequence of operation is on these units for a cooling call .. Any differences from other units..?Does the main ?? circuit board run the economizer..
  48. How do you get off the roof once working in commercial

    What skills can you recommend learning to avoid having to use extension ladders and working on roofs in commercial hvac.
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    Quitting hvac to drive a truck??

    Tired of coming home with a sore back.. Thinking I could sit on my but and drive a truck and make just about as much.. Plus I would not have to waste money replacing and buying tools.. Has anyone...
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    Quitting hvac to drive a truck..

    Tired of coming home with a sore back.. Thinking I could sit on my but and drive a truck and make just about as much.. Plus I would not have to waste money replacing and buying tools.. Has anyone...
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