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  1. Replies
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    All, The loop issue cannot be fixed. Its not...

    All,

    The loop issue cannot be fixed. Its not even a long term issue, its a weird anomaly that occurs due to my location in the building. Landlord refuses to fix it.

    It only happens 1-2 times a...
  2. Replies
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    1,837

    Lieberts and High Head Pressure Limit Switch

    I have about 38-ton of Liebert cooling - all glycol condenser cooled.

    The building operates a 24x7x365 loop with roof top cooling towers.

    I am on the 1st floor, and for the past 2 years have...
  3. Replies
    2
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    595

    Attic AC Options - Creating a zoned system

    I have a question about what AC options exist for an attic installation.

    For starters, I have alot of experience with commercial Liebert AC units for datacenter facilities. I work with air-cooled...
  4. Replies
    32
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    3,994

    Carrier Heat Pumps - Colder Climates

    I ran into someone at a home show in Philadelphia, PA and to may shock he was showing off a new heat pump unit from Carrier. I pulled him aside and asked why he was trying to push heat pump...
  5. Replies
    7
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    1,130

    There is plenty of redundancy, we have 15-tons of...

    There is plenty of redundancy, we have 15-tons of backup capacity. So we're covered if a compressor fails in the 20-ton, and even if the 20-ton has a total shutdown, we're only down a net 5-tons,...
  6. Replies
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    1,130

    GoColts, thats exactly what is occurring here....

    GoColts, thats exactly what is occurring here. After a few days, we've noticed that the temp spike happens at the same time everyday - approx 24 hours apart.

    Is there a benefit to letting the unit...
  7. Thanks for all the replies... Here is an update....

    Thanks for all the replies... Here is an update.

    We are doing a pressure test tomorrow for the condenser. The building (who maintains the loop) also took a glycol sample to check the specific...
  8. Replies
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    The unit is a 2004 date code. I dont know the...

    The unit is a 2004 date code. I dont know the eeprom version until I look at it on Mon.

    We just recently added sensors right by the discharge plenum, so we just recently noticed this.

    The cycle...
  9. Recommendation for web-connected AC thermostat/control

    I was searching the web for a wired-internet controllable thermostat for AC control. So many options, I found it hard to make a choice, was hoping someone could make a recommendation.

    We have two...
  10. Replies
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    1,130

    Liebert System3 Deluxe Controls

    We have noticed an odd thing that our 20-ton Liebert CRAC unit is doing - about once every day or so.

    The unit is effectively running at full load, it should never cycle off either compressor. But...
  11. Head Pressure and Flow Issues - Liebert Glycol Unit

    I have a 20-ton Liebert CRAC unit, glycol condenser cooled.

    The unit has a 2" glycol supply and return feeding it. Its a building loop that I have no control over. The 2" pipe runs horizontal for...
  12. Infrared/pan units are easy, just have to clean...

    Infrared/pan units are easy, just have to clean out deposits in pan with a brillo. Problem is power consumption.

    The interest in ultrasonic was energy savings. In a CRAC environment, we have very...
  13. Experience with Ultrasonic Humidification in Liebert?

    Would like to see if anyone has had experience with retro-fiting an ultrasonic humidification system into a Liebert or into any commercial space.

    Found a company that makes these ultrasonic units,...
  14. Replies
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    Downflow and Upflow in the same room

    I am on the fence regarding a purchase of a 20-ton Liebert unit for a datacenter.

    The space has a 14" high raised floor plenum that we currently use with (3) 5-ton downflow Lieberts.

    The new...
  15. The thing that really concerns me is that if the...

    The thing that really concerns me is that if the leak is from the water/glycol condenser coil, what else does that imply. If the glycol/water could eat in small hole in the outside tube portion...
  16. The thing that really concerns me is that if the...

    The thing that really concerns me is that if the leak is from the water/glycol condenser coil, what else does that imply. If the glycol/water could eat in small hole in the outside tube portion...
  17. Am I crazy or is this the weirdest leak ever...

    One of my Liebert Challenger 3000's was looking to be a tad low on refrigerant. Could be a leak, could just be losing from gauge connections over the month.

    I noticed what looks to be an oil stain...
  18. True cost of a water-cooled unit (domestic tap)

    I have a backup 5-ton water-cooled unit.

    In full operation, it uses about 4gpm.

    I was trying to calculate the true daily and monthly cost if I ran the unit 24x7. Just wanted a second pair of...
  19. I love this forum. I second set of eyes (and...

    I love this forum. I second set of eyes (and mind) always helps.

    The Challenger 3 definitely can ship without a LP switch, like mine. I didn't realize that the LP circuit has to be satisfied even...
  20. Old Liebert Challenger - compressor shuts down after 3min

    Another old Liebert unit I am raising from the dead. Its a 1994 Challenger 3 with Level 0 controls, Glycol.

    Unit starts up and compressor comes on. Gauges show 60/205. Liquid line solenoid opens...
  21. Replies
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    Fixed... This is a 1984 Challenger 2. There is...

    Fixed...

    This is a 1984 Challenger 2. There is no triac jumper, but it does have a manual low pressure switch with cut-in and cut-out.

    De-installer messed with those settings and thats why the...
  22. Replies
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    1,554

    Old Liebert refuses to shutoff...

    I acquired an older Liebert Challenger2 - date code 1984. Its in very good condition - in fact I think it was never used, but has a few weird problems.

    1. When you open up the main circuit...
  23. Replies
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    714

    Thanks. And because its a NC valve, if there...

    Thanks.

    And because its a NC valve, if there is any kind of internal failure with the valve control mechanism itself, it will remain shut, and the Liebert sensors will know to shutoff the...
  24. Replies
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    Water Reg Valve on older Liebert

    I picked up an older Liebert Challenger 2. Model is CU069W - so its a 5-ton water-cooled unit.

    Like most water- or glycol-cooled Lieberts, it has a 2-way water regulating valve. Most of my Liebert...
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