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Type: Posts; User: Cold shot

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  1. Replies
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    2,653

    Poll: I have installed, started & commissioned...

    I have installed, started & commissioned Mitsubishi Citi-Multi Systems that have been in operation for 10 years. I can not speak to the reliability of other VRF systems. In my opinion, Mitsubishi...
  2. Replies
    15
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    1,978

    May have got away with it using 22, but never...

    May have got away with it using 22, but never with 410 & POE oil. We fix a lot of these after poor install. Purge with nitro during all pipe work. Triple evac & use ACCURATE micron gauge.
    ONLY...
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    1,978

    410a systems are even more prone to clogging LL...

    410a systems are even more prone to clogging LL driers.
  4. Replies
    15
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    1,978

    APC, Stulz, Data Aire... All are inferior to...

    APC, Stulz, Data Aire... All are inferior to Liebert in my opinion.
    Also, in-row cooling designs are the way to go.
    LIEBERT IS THE CADILLAC OF CRITICAL ROOM COOLING!
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    2,838

    I have not seen that before, interesting. Must...

    I have not seen that before, interesting. Must have a second contactor to run fan in opposite direction.
  6. Thread: Carrier RTU

    by Cold shot
    Replies
    24
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    3,024

    True, but there are several things that can be...

    True, but there are several things that can be added. Air proving switch, freeze stat, low & high pressure switches, discharge line thermostats, phase monitors. All to protect the compressor.
  7. Thread: Carrier RTU

    by Cold shot
    Replies
    24
    Views
    3,024

    Economizer would disable 1st stage mechanical...

    Economizer would disable 1st stage mechanical cooling if outdoor conditions were suitable (sounds like they are) for free cooling. Suction line freeze stat on 2nd stage compressor or Low ambient...
  8. Is it a semi-hermetic?

    Is it a semi-hermetic?
  9. Replies
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    2,400

    Tried to get guys to use this at our company,...

    Tried to get guys to use this at our company, they were too OLD SCHOOL. I think these rings eliminate using too much Silfos on joints (a lot of techs do this to make sure no leaks). Also works very...
  10. Replies
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    2,838

    Carrier 38AKS condensing units with 2 fans do...

    Carrier 38AKS condensing units with 2 fans do this too. #2 fan rotates backwards while #1 runs, when #2 is energized, it continues to run in wrong direction. A new capacitor fixes this.....for a...
  11. Replies
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    2,653

    Poll: Our company learned this the hard way...

    Our company learned this the hard way too......MITSUBISHI'S ARE THE ONLY MINI SPLIT & VRF'S WE INSTALL NOW! CITY MUTI IS A GREAT PRODUCT.
  12. Replies
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    2,202

    Use a high quality electronic vacuum gauge (not...

    Use a high quality electronic vacuum gauge (not your $100 variety). Gotta trust your tools!
  13. Replies
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    3,291

    Find the cooler gpm in the Manufacturers IOM...

    Find the cooler gpm in the Manufacturers IOM book. There will be a minimum & maximum GPM graph where you can plot your FT./head. You will need to get cooler entering water psi & cooler leaving...
  14. Replies
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    2,202

    I have installed 3 of the City Multi systems- a...

    I have installed 3 of the City Multi systems- a great tip is to inventory your refrigerant tubing (lengths) & save the unused pieces from each branch line. Measure those left over pieces & subtract...
  15. Replies
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    2,202

    Just use a good recovery machine & keep recovery...

    Just use a good recovery machine & keep recovery tanks cool.
  16. Replies
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    3,068

    Personally, I use my rubber gloves & leather...

    Personally, I use my rubber gloves & leather protector gloves when I feel it is necessary. Mostly when I am working inside an electrical panel, motor starter control cabinet etc. Also voltage...
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    1,673

    Burnouts in Heat Pumps are very troublesome...

    Burnouts in Heat Pumps are very troublesome because of the possibility of getting debris in the check valves, reversing valve etc. I would encourage the customer to replace the unit before heading...
  18. Replies
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    1,673

    I use Acid Away & install suction & liquid line...

    I use Acid Away & install suction & liquid line replaceable core driers w/ HH cores. Run system for a couple days, remove suction core, replace liquid line core drier with standard core drier & run...
  19. Replies
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    1,737

    Time for a new RTU!

    Time for a new RTU!
  20. Thread: leibert

    by Cold shot
    Replies
    9
    Views
    1,657

    I was referring to the Challenger & Minimates. I...

    I was referring to the Challenger & Minimates. I have worked on the ICOM In-Row with digital scroll R410 & 407C. I have not been to the ICOM class yet.
  21. Thread: leibert

    by Cold shot
    Replies
    9
    Views
    1,657

    Lieberts very good machines & are easy to work on.

    Lieberts very good machines & are easy to work on.
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