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  1. Replies
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    We can measure the SC. Thanks.

    We can measure the SC. Thanks.
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    System

    It is a R-134a system with a 5 hp scroll compressor, TXV, evap & cond coils & F/D. Two motors - one for air over the condenser/compressor and the other for drawing air over the evap coil and into...
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    How to tell if you are low on refrigerant

    We have a relatively simple HVAC system where we have thermocouples in various locations, pressure gauges and a sightglass.

    Is there a way based on pressure and temperature to determine if there...
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    Another Recycling Question

    Is it better to NOT use a recycling unit on R-134a or some other blend? Is it only really good for something like R-22? My thinking is if the blend has leaked, it's not really the correct...
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    Thanks for the helpful response. Good...

    Thanks for the helpful response. Good information.

    - Andreas
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    We repair air conditioning systems pulled off...

    We repair air conditioning systems pulled off locomotives. They are not in the best condition when they come in. The question I should have asked early on was what do you think is acceptable to put...
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    Recycle

    Recycle
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    Recommend a Recycling Unit?

    Does someone have a recommendation on an R-22 Recycling Unit to be used on about 40 units per year? The charge is 10 lbs.
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    Reply

    Thanks for your responses. Any thoughts are welcome.
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    Detachable HVAC System

    I work in locomotives, and we are looking at using a split system like you would see in a house. That is, the condensing box would be 10-15 feet away from an evaporator box. The question is how...
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    Sprayed on is what I was thinking. I'm trying to...

    Sprayed on is what I was thinking. I'm trying to cost-reduce the unit, and I was thinking spray-on may be cheaper from a material standpoint and take less time and effort to apply. Maybe there's a...
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    Blown-in Insulation

    We insulate an HVAC box with 1/2" black foam insulation with adhesive backer as shown in the attached photo. Do you know if a blown-in insulation would serve as an effective cheaper alternative?
    ...
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    Thanks

    Thanks for the information. Because we are in a pinch and the vendor cannot turn something around quickly enough, we will use the three pieces. Have a good day!
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    Application

    It is used in railway HVACs
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    The correct attachment

    I apologize for putting the wrong attachment to my previous email. This is the correct one.

    3350
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    Questionable Stainless Tube Bend

    3349

    We are in a time crunch and need the above part. Do you think this stainless steel having a ripple in it be acceptable for installation? It will be on the suction accumulator or low...
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    Thanks

    Thanks for your answer. I finally did get through to a salesman and they said not to mount it rotated 90 degrees.
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    Application

    We are re-building an old rooftop locomotive HVAC. It had an old Chrysler automotive compressor with the suction/discharge tubes coming out horizontally. We need the tubes to be horizonal to fit...
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    Automotive Compressor - Rotation Acceptable?

    We are re-building an HVAC and putting in the Seltec TM-15HS automotive compressor shown in the attached file. Do you think we can rotate the compressor 90 degrees so the suction and discharge are...
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    Thanks

    My buddy looking for an answer apparently found it on his own. In his words.......

    I found the answer this morning and
    sent it to my dad. The answer depends on many different variables but I...
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    Heat Pump Capability

    Say you have just bought yourself an Amana window mount heat pump which performs both heating and cooling operations. What volume of space can you expect it to cool or heat?

    I believe the most...
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    It has a thermostat and will not run all the...

    It has a thermostat and will not run all the time. It would be a couple of weeks before I could get a picture. Unfortunately they are doing plant inventory and all the HVAC units are cleared out.
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    This is an HVAC for locomotives and the...

    This is an HVAC for locomotives and the compressor is a TM-15HD. We run about 1600 - 2000 rpms on the compressor when maximum is 6000 rpms. (Why not 3500 rpms?, I don't know). I have learned the...
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    System Info

    Andreas here. I have looked into the system further....
    - The compressor is manufactured by TAMA and the model no. is 488-45021. R134a.
    - There are no pulleys. The motor shaft is tied to the...
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    Would reducing the refrigerant charge (in lbs)...

    Would reducing the refrigerant charge (in lbs) help?
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    Say you have an external motor driving an...

    Say you have an external motor driving an automotive type compressor. Say the motor always runs at 1600 RPM. Next say you have increased the motor's RPM to 2000 RPM but have changed nothing else in...
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    Thanks for the reply.

    Thanks for the reply.
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    What happens if the refrigerant flows backwards...

    What happens if the refrigerant flows backwards through a liquid line filter-drier, that is, opposite the arrows printed on it? Is this a no-no?
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    Thanks for the opinions. - Andreas

    Thanks for the opinions. - Andreas
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    I work for a company that manufactures HVAC units...

    I work for a company that manufactures HVAC units for locomotives. We are toying with the idea of replacing the copper condenser coil with an aluminum coil as a cost reduction. Are the copper and...
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    I work for a company that makes HVAC units for...

    I work for a company that makes HVAC units for locomotives. The question is one of our service shops has found R-134a at a significantly lower price, say $100, at Sam's Club. We are currently...
  32. Thread: Fan Swap

    by andreas
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    To be a little more clear on my part, we are...

    To be a little more clear on my part, we are constrained to a smaller HP in the replacement motor, but we can alter the motor's RPM as we like. To make the HVAC system work as before, that is with...
  33. Thread: Fan Swap

    by andreas
    Replies
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    We make HVAC units for locomotives and are...

    We make HVAC units for locomotives and are looking at swapping out the condenser and evaporator fans for the purpose of having a different voltage. How do you ensure the HVAC system will run as it...
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    Any suggestions to this problem on a household AC...

    Any suggestions to this problem on a household AC problem?:

    1) Condensation overflow
    2) Drain has been checked & cleaned of crud. Continues to drip on floor and not from drain line.
    3)...
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    The current customer spec is they want 30,000...

    The current customer spec is they want 30,000 Btu/hr at the test condition of 95 F ambient air entering the condenser and 80 F DB and 67 F WB air entering the evaporator. Our unit, designed by an...
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    You guessed correctly on the model -...

    You guessed correctly on the model - ERF1-0310-FXX (55 V).

    Thanks for the comments - definitely worth looking into. I am thinking to re-size the coils, txv and fans, you would need some sort of...
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    It's a Copeland semi-hermetic operating at 60 hz...

    It's a Copeland semi-hermetic operating at 60 hz - not an open drive.

    We are open on adding a feature or a re-design to achieve the 11% boost in capacity.
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    A little more on the system.... It is contained...

    A little more on the system.... It is contained in a large box that is attached to the underside of locomotives. The locomotive provides 74-V, but an inverter brings it down to 55-V for the HVAC...
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    Does someone know of a way of increasing the...

    Does someone know of a way of increasing the capacity of a well established air conditioning system by 11% at its rated condition? We have a 3-ton reciprocating compressor with R-22 in place now. ...
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    Thanks. Your answers make sense. Also, I will...

    Thanks. Your answers make sense. Also, I will surely benefit from my upcoming community college classes, Basics of Cooling and Cooling Systems, and HVAC Loads and Psychometrics.
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    Thanks for the helpful responses. My...

    Thanks for the helpful responses.

    My followup question is what if in addition to changing the compressor from 3-ton to 5-ton, you changed the refrigerant from the higher pressure, higher...
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    I am green in the industry (hence the...

    I am green in the industry (hence the question).....

    Say you had an HVAC system with a 3-ton compressor, and decided to put a 5-ton compressor in it instead. Nothing else is changed - coils,...
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