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Type: Posts; User: RuralSpaceman

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  1. Replies
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    In case your customer might like to add a...

    In case your customer might like to add a variable frequency drive one day... make sure everyone understands the system is a "corner grounded, delta system" and follow the VFD installation...
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    1,009

    On the "Multistack" water cooled chillers, the...

    On the "Multistack" water cooled chillers, the condenser coils are the same BPHE type. However water from the tower enters the bottom of the HEs. I think the heat transfer works well in either...
  3. Replies
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    1,617

    Been using Turbo Torch for brazing commercial...

    Been using Turbo Torch for brazing commercial work for over 15 years.

    That's with just the Turbo Torch tips and acetylene only - no O2. Installed two 8-ton computer room AC units w/ remote...
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    1,357

    Pretty sure one side of the 24v transformer is...

    Pretty sure one side of the 24v transformer is supposed to be grounded, if so make sure it's well grounded - no paint in between.

    How many stages (contactors) can turn at once - can the...
  5. Replies
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    Yep. I've seen an extra section of pipe...

    Yep.

    I've seen an extra section of pipe installed just past the chiller to make it easier for access and inspection. Remove the blank and the screens are right there.

    Need a long hook to gently...
  6. Replies
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    10,101

    Sorry guys, I know it's been a while. Last I...

    Sorry guys, I know it's been a while.

    Last I heard the electricians (different company) were having trouble getting circuit breakers which feeds this buildings panel. Until then - no power. The...
  7. Arc Flash clothing layers... does it add up?

    Since it seems arc flash PPE is a requirement now, does anyone know if the HRC value increases with the more layers of arc flash rated clothing one wears? Does HRC2 long-sleeve shirt + HRC2 jacket =...
  8. Replies
    12
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    1,133

    Never seen a 1/16'' tube used for TXV...

    Never seen a 1/16'' tube used for TXV equalization before, always 1/4" - wouldn't even hesitate to change this. If the equalization tube plugs or can't ventillate itself, the result would be the...
  9. Replies
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    1,737

    You can lead a horse to water...

    You can lead a horse to water...
  10. Replies
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    1,737

    I would recommission the drive, no doubt about...

    I would recommission the drive, no doubt about it.

    Who knows maybe someone was curious and changed a parameter by mistake and doesn't want to say.

    Make sure the switching frequency is not se...
  11. Replies
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    897

    How much load is there on the unit? What's the...

    How much load is there on the unit? What's the return air temp? Is the air filter full? How's the airflow? Is the termostat in a good location? What's the temp setpoint?

    Answer these questions and...
  12. Replies
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    1,758

    Good answer.

    Good answer.
  13. Replies
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    2,176

    Carrier - fusible plug. Notorious for leaks. ...

    Carrier - fusible plug. Notorious for leaks.

    Replace it when you can. In the meantime, fill it with 95/5 solder - melts around 450F.

    Don't just cap it off - dangerous.
  14. Replies
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    1,731

    Humid weather in Toronto? The higher the humidity...

    Humid weather in Toronto? The higher the humidity - the more frost there'll be. Need to set the defrost timer to whatever works. Should only have frost forming, not ice remaining. If that's the case...
  15. Replies
    15
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    1,727

    Been there too. Seems to be a design problem -...

    Been there too. Seems to be a design problem - happens often on small bore shafts with long spans. Shaft will "whip" with the smallest amount of fan unbalance.

    If you can't have the fan (shaft,...
  16. Most people don't concern themselves with this...

    Most people don't concern themselves with this sort of thing for a small fan like this. If there's trouble, there would be other symptoms... vibration, bad bearings, noise... then troubleshoot from...
  17. Replies
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    10,101

    We put in the press transducer and temp sensor...

    We put in the press transducer and temp sensor for SH calculation and an EEV, coil and air sensors too of course. Once it's up, I think the customer will go for the network connection so they can...
  18. Replies
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    10,101

    I installed one last week for the first time for...

    I installed one last week for the first time for a new 1200 sqft freezer. Start up and commissioning next week.

    It better work is all I can say.
  19. Certainly emergency circumstances will create...

    Certainly emergency circumstances will create crazy ideas, but when we have a choice to do the right thing as mechanics, we ought to.

    Here's a good article on the topic.
  20. Yes I remember Bernoulli's Principle from my...

    Yes I remember Bernoulli's Principle from my industrial gas fitter's course, but I'm not sure it applies in a case like this. I can't think of any part of a refrigeration system that would form a...
  21. No way. I wouldn't believe that even if the unit...

    No way. I wouldn't believe that even if the unit somehow ran under water.

    Moisture has a mass and it moves by force like everything else. Until the forces equalize, moisture will stay where most...
  22. Replies
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    1,844

    Normally, domestic water or chilled water cooled...

    Normally, domestic water or chilled water cooled condensers will have a head pressure regulating valve installed on the water outlet of the coil. When the unit starts and the head pressure builds the...
  23. Gonna need two motors soon!

    Gonna need two motors soon!
  24. Replies
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    5,229

    From a deep vacuum, weigh in your charge man! Why...

    From a deep vacuum, weigh in your charge man! Why on earth wouldn't you? Read the Fujitsu IOM. End of story.
  25. Replies
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    461pat, find and read the IOM for this unit. If I...

    461pat, find and read the IOM for this unit. If I remember right, a new unit in cooling mode should have 11-14 deg F rise across the source side piping and 8-10 deg F drop in heating mode. This must...
  26. I started an HVAC apprenticeship in Ontario in...

    I started an HVAC apprenticeship in Ontario in 1989. Near when I became Journeyman my employer asked if would join the DDC group. It has been an excelent career move. Not many controls technicians...
  27. Replies
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    683

    What's the problem...?

    Ok, so there's at least one problem here but are there more?

    The unit is a York rooftop heat pump unit, about 12 years old. I found the door to the blower compartment about 12' from the unit - no...
  28. Replies
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    Wow... I would be very careful about using this...

    Wow... I would be very careful about using this product. Outside air is introduced into buildings for other reasons - maintaining O2 and CO2 volumes per cubic foot of indoor air is one of them.
  29. Replies
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    In the HVAC industry, I've thought pillow block...

    In the HVAC industry, I've thought pillow block bearings shouldn't be warmer than your hand (90F). Otherwise where would the heat be coming from? Friction - too much grease, no grease? Vibration -...
  30. Replies
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    1,239

    Make sure the unloader gaskets are the right way....

    Make sure the unloader gaskets are the right way. Sometimes they look right but aren't. You need to be absolutely certain they are the right kind and installed the right way. If not the compressor...
  31. Replies
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    Certainly an interesting sytem, thanks for...

    Certainly an interesting sytem, thanks for posting.

    As for the new equipment... make sure to consider the application or use of space. Nothing like sitting in a theatre in your shorts & t-shirt...
  32. Replies
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    If you've decided you have a refrigerant problem,...

    If you've decided you have a refrigerant problem, as in how much, and no other problems as in contamination - reclaim, evacuate and weigh in the nameplate quantity plus the extra (0.6 oz/foot beyond...
  33. Replies
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    ^^funny^^ Maybe you mean split-taper sheaves...

    ^^funny^^

    Maybe you mean split-taper sheaves with a concentric bore? Like this:

    http://www.emerson-ept.com/eptroot/public/prod/Components/VBeltDrives/SplitTaperShv.asp
  34. Replies
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    526

    Have to clairify myself. No problem so long as...

    Have to clairify myself. No problem so long as both units are a Cat I appliance - nameplate would say so. Cannot connect atmospheric unit into postive pressure vent for obvious reasons.
  35. Replies
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    I think you're talking about air in the...

    I think you're talking about air in the refrigerant side, not the water side? (open loop water system) If so, air is a non-condensable gas in a refrigeration system. Among other things air will take...
  36. Replies
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    I think circuit 1 is short-charged pal. The tech...

    I think circuit 1 is short-charged pal. The tech before you replaced txv and drier... ok, but only charges refrigerant until the site glass clears. Resulting short-charge raises the evap outlet temp...
  37. Replies
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    526

    No code issue in BC, as long as the vent and both...

    No code issue in BC, as long as the vent and both connectors are correctly sized.
  38. Thread: LLSV

    by RuralSpaceman
    Replies
    17
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    1,852

    Doesn't make sense. Scrap the Alco and try a...

    Doesn't make sense. Scrap the Alco and try a Sporlan to get you going again, then do forensic on the Alco. ?? Maybe a bleed port is blocked?
  39. Thread: LLSV

    by RuralSpaceman
    Replies
    17
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    1,852

    What would happen if the LLSV was installed...

    What would happen if the LLSV was installed backwards?
  40. Replies
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    456

    ds, I can appreciate your concern around...

    ds, I can appreciate your concern around installing a UFAD type HVAC system. I'm wondering why the design group is pressing so hard for it when there are other systems which would better suit the use...
  41. Replies
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    11,274

    Old thread, but couldn't help it, made me...

    Old thread, but couldn't help it, made me curious. With elvis66 MIA, I think indy2000 has called it on this one. No need to worry if level present and not tripping.

    One thought tho... POE has more...
  42. Replies
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    542

    Hey thanks gasguy! From the Kootenays. Work for a...

    Hey thanks gasguy! From the Kootenays. Work for a small firm here, but we seem to get a lot of the weird stuff - so I thought I should join an HVAC forum to help with those "head scratchers".
    Cheers
  43. Replies
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    542

    Hello from British Columbia

    Took a tour of the site for the first time this weekend, great forum! Saw some really good questions and some really good answers. Kinda jumped the gun tho and threw my 2 cents in on some post before...
  44. Replies
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    1,978

    Need to install a side-stream filter with a 40...

    Need to install a side-stream filter with a 40 micron filter core across the HP loop circ pump. Then install an HP loop detergent for iron piping and let circulate for a week or so. Afterwards,...
  45. I would recommend consulting a Building...

    I would recommend consulting a Building Automation/Controls contractor in your area - sounds like the controls are due for an upgrade. They should be able to help you control the equipment in the...
  46. Replies
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    1,143

    Go to a HVAC/R wholesaler which sells the product...

    Go to a HVAC/R wholesaler which sells the product you have. If they can get parts for your equipment, they can also get you a schematic.
  47. Replies
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    Found same kinda pblm on McQuay RTU onetime....

    Found same kinda pblm on McQuay RTU onetime. Eventually learned it only happned during or after rainy weather. Control section was under neg pressure from supply fan and cabinet panels let water draw...
  48. Replies
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    676

    1. Reduce the water content in the air around the...

    1. Reduce the water content in the air around the equipment - this is the real issue. Pkg de-hum units (like above) are effective and efficient.
    2. Insulate the the equipment from the environment....
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