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  1. Replies
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    887

    With those numbers it does look like ckt 1 is...

    With those numbers it does look like ckt 1 is overcharged. Subcooling at 32 and SH at 10 with 266psi head. What is your water entering temp? Are you sure the free cooling coil valve isn't leaking?...
  2. Replies
    14
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    887

    Low airflow would cause and can be verified by...

    Low airflow would cause and can be verified by amps vs nameplate FLA. If that was an issue, i would think you would of heard of hot spots in the room by now. You said this unit has a free cooling...
  3. Replies
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    849

    Air in the water side will cause the refrigerant...

    Air in the water side will cause the refrigerant head pressure to rise. An air pocket flowing around in a system can cause HP tripps based on when air enters the condenser, the refrigerant pressure...
  4. Replies
    14
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    887

    Sounds like the 20psi difference is coming from...

    Sounds like the 20psi difference is coming from whoever installed the TXV and didn't properly adjust along with that high subcooling. Is this unit condenser an air cooled or water cooled? What where...
  5. Replies
    5
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    897

    How old is compressor? SH is a little low but...

    How old is compressor? SH is a little low but sounds like the powdercoat didn't adhere properly and under constant heat load (172F) is causing the bubbling. How bad is the bubbling?
  6. Replies
    3
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    877

    Yes, you said the plate machine was off and i was...

    Yes, you said the plate machine was off and i was asking can you turn the min-mate off at night also? if so, then activate the setback feature in the wall box to shut it down at night. This SCR is...
  7. Replies
    3
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    877

    The SCR Reheat in the Mini-Mate is for a more...

    The SCR Reheat in the Mini-Mate is for a more precise temperature control. It is not designed to reheat a room. When cooling is activated the SCR's are activated to control the temperature drop more...
  8. Replies
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    1,860

    HGBP would only come into play if you were having...

    HGBP would only come into play if you were having some Low Suction issues and that would be from Low Load. If these units have proper load then HGBP should not be activated. From what your saying...
  9. Replies
    12
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    1,860

    Are all XDV's running? Sounds like low load. you...

    Are all XDV's running? Sounds like low load. you have 320kw of cooling capability with 2 chillers. You need at least 40%(130kW) to run them properly. What is the load in the space? U may have to turn...
  10. Replies
    13
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    1,652

    How may tons of cooling do you need currently?...

    How may tons of cooling do you need currently? How far away are the condensers and what elevation? Need more info..
  11. Thanks Guy's, I appreciate it. Glad I am able to...

    Thanks Guy's, I appreciate it. Glad I am able to help. I am known as a Liebert junky even though I don't work there anymore, but I still push the product because I think it is great and the...
  12. To access the Set Mode 2 programming functions,...

    To access the Set Mode 2 programming functions, perform the following steps: 1.

    Use the Advance push button to scroll to the red TEMPERTURE led.

    2.

    Simultaneously press and hold the...
  13. I have a PDF for the level 00, Here is some info...

    I have a PDF for the level 00, Here is some info from the Service Manual. I can't post PDF's to this site.
    ------------------------------------------
    Microprocessor Control Board Display and...
  14. Here you go: Install Manual:...

    Here you go:


    Install Manual:
    http://www.emersonnetworkpower.com/en-US/Brands/Liebert/Documents/Discontinued%20Product%20Documents/SL-18200.pdf


    O&M Manual...
  15. Where are your High and Low Humidity alarm points...

    Where are your High and Low Humidity alarm points set to? The lamps do not lower temperature. You have to look at all aspects when trying to trouble shoot humidity issues. 5% is to...
  16. What is your OAT? 240 would be ok if your OAT is...

    What is your OAT? 240 would be ok if your OAT is 80+. Head pressure on an an air cooled unit will be affected by OAT. I like the numbers on your other compressor. 200 is more reasonable for current...
  17. The compressor pumped down after power cycle due...

    The compressor pumped down after power cycle due to it just completely shut off on a safety and did not pump down. Another concern is that the unit is making temp at 68F with one compressor, which...
  18. Those pressures seem to good to be true. Sounds...

    Those pressures seem to good to be true. Sounds like a faulty Low PSI Switch. They are Auto reset. Only HPS is Manual reset. You could test the LLSV by having guages on and cycle compressor off and...
  19. What were your pressures if you don't mind? ...

    What were your pressures if you don't mind?

    Also, is this an air cooled unit or water cooled?
  20. That sensativity set points are very tight. The...

    That sensativity set points are very tight. The temp set point is low and rh is high. With no real room load, you need to balance the units with the sensativity. With all concrete walls, that adds to...
  21. I agree with keeplearning. If you are using a...

    I agree with keeplearning.

    If you are using a Residential unit to cool this room, the only option you have is to install a head pressure control device to cycle the condenser fan in 0F and let it...
  22. Replies
    19
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    2,372

    No arguing- Just discussion.. The book states...

    No arguing- Just discussion.. The book states -maintain 230# to ensure the head pressure control valve is closed. You are correct in that it does state above the sightglass. I was taught to charge it...
  23. Replies
    19
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    2,372

    You need to float the ball at 1/2 sight glass at...

    You need to float the ball at 1/2 sight glass at 230-240. It is tricky to do and you have to be ready for it. These are easy to over charge.
  24. Replies
    33
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    6,771

    What Chiller Guy said. Also, I have ran into...

    What Chiller Guy said.

    Also, I have ran into this problem too many times on Start-up's when I was at Liebert. That High Head + Flashing Sight glass was always 99.9% NON-Condensables. Some one...
  25. There will be alot of variables to answer that...

    There will be alot of variables to answer that question. What is your critical load kw? How may CRAC units are there and what size are they? Is your room raised floor? Basically your cooling tonnage...
  26. Replies
    16
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    1,201

    The question is How much R-22 was added. Does...

    The question is How much R-22 was added. Does this unit have Air or Water Condenser? All I am saying is he needs to be on the safe side to prevent problems. Its like putting Gas in a Diesel truck....
  27. Replies
    16
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    1,201

    It is necessary due to the fact that the 22 was...

    It is necessary due to the fact that the 22 was introduced to the system. Now the system oil has been contaminated. Check the link out for R22-R407C Coversion.
    ...
  28. Replies
    16
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    1,201

    Klove, Looks like I may have over looked what I...

    Klove, Looks like I may have over looked what I wrote. My mistake....I corrected my posts.
  29. Replies
    16
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    1,201

    He said that another tech added R-22 to the R407C...

    He said that another tech added R-22 to the R407C system.
  30. Replies
    16
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    1,201

    There is the Problem.:LOL: Yes the compressor...

    There is the Problem.:LOL:

    Yes the compressor will run but your cooling tonnage went down. How much R-22 was added? Regardless, the blend is no good now for the R407C. Time to remove and flush...
  31. Replies
    4
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    1,210

    Ok, they did that design to accommidate the new...

    Ok, they did that design to accommidate the new Paradenser Condenser (Designed by Liebert for R407C) and provide the best filtratration for that area. The only way to bypass that would be to build a...
  32. Replies
    4
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    1,210

    Are you talking about the new Liebert DS/VS unit?...

    Are you talking about the new Liebert DS/VS unit? The deluxe replacement.
  33. Replies
    8
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    2,939

    What is your glycol cut(60-40, 70-30%)? 4*F...

    What is your glycol cut(60-40, 70-30%)? 4*F split? How old are these units? Sound like the cut isn't correct(too much glycol or too much water). At your highest point in the system, Do you have air...
  34. Hello, What is the Humidity set point and the...

    Hello,

    What is the Humidity set point and the Humidity sensitivity at the CRAC unit? Are these Lieberts Avanced Microprocessor? How big is the server room and how many CRAC units? Is there any...
  35. Replies
    20
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    3,405

    Is the Aqua-Stat for the Glycool setting Set at...

    Is the Aqua-Stat for the Glycool setting Set at 60*F or below? You should be at full mechanical cooling with that high return. You have to pull return temp past 66*F (68*F -2*F) to cycle off...
  36. What were your suction line temps? Were both...

    What were your suction line temps? Were both compressors at 100%?
  37. Replies
    42
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    4,894

    Traps for every 25' of rise. Sounds like the...

    Traps for every 25' of rise. Sounds like the install with the traps is ok. Are the units loaded? What are your pressures and Superheat? Are the Liquid Line sight glasses flashing? Where is the oil...
  38. Replies
    35
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    3,603

    Klove, No worries. I hope that you didn't think I...

    Klove, No worries. I hope that you didn't think I talking about you guy's when I said special breed for facility guy's. I was not talking about anybody here. I was talking about the Building...
  39. Replies
    2
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    2,040

    That should be 24VAC actuator. Check your...

    That should be 24VAC actuator. Check your dipswitches and make sure #5 is set to on (Dual Cooling). The 7153 is Feedback Control which shows the board valve position where you can see it through...
  40. Replies
    35
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    3,603

    Wow, I was talking about 06D compressor's that we...

    Wow, I was talking about 06D compressor's that we use in Precision Cooling apps. I know there is more Critical situations than Data centers. I thought we were talking about that.
  41. Replies
    17
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    1,684

    Air, I have been in rooms that have been...

    Air,

    I have been in rooms that have been lower than 30%. The lowest being around 20%. I have asked the IT guy's in the rooms that are low in humidity if they are seeing any problems and they...
  42. Replies
    35
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    3,603

    Thank You, Data Rooms are a special breed. I...

    Thank You,

    Data Rooms are a special breed. I have worked in rooms where they want a MOP (Method of Procedure) for putting a set of gauges on. Contractor's have been thrown out of these rooms...
  43. Replies
    17
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    1,684

    BR7401, This is what you will find in most...

    BR7401,

    This is what you will find in most computer room

    Temperature avg = 68-72*F

    Humidity avg = 30-50% RH

    Room design will play a big role in the capability of humidification.
  44. Replies
    35
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    3,603

    Don't take chances, just do it right the first...

    Don't take chances, just do it right the first time and replace the valve. The 1/2 hr you save repacking vs. sweating in a new valve isn't worth the damage with the customer relations if that valve...
  45. Replies
    2
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    943

    I have been told to size for 115-125% of load....

    I have been told to size for 115-125% of load. What they are adding will take another 3.5-5 tons of cooling. A challenger unit will handle that (BU042 or BU060). What size room? You don't want to go...
  46. Replies
    11
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    1,705

    Jay, What is the Humidity readings on the...

    Jay,

    What is the Humidity readings on the units now? How much load is in this room?

    Would not recommend putting 100% outside air into a return plenum, because it is going to give the units a...
  47. Replies
    8
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    1,139

    OH OK, Thanks Domcort. I looked at the break down...

    OH OK, Thanks Domcort. I looked at the break down sheet and couldn't find it. Good info on the charge.
  48. Replies
    8
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    1,139

    I looked this condenser M/N up and do not show a...

    I looked this condenser M/N up and do not show a PB280A-A. That is kind of big for the 5 ton challenger M/N you gave. Does this condenser have a side mounted receiver (Lee Temp)?
  49. Replies
    20
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    1,709

    LOL...OK:rolleyes: Are are going to cycle...

    LOL...OK:rolleyes:

    Are are going to cycle compressors off and use the glycol to cool if water temp is 68-72*F, which is most room temps. What will that give you...68-72*F supply temp! That won't...
  50. Replies
    7
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    9,458

    Had to stop a start-up because I found this same...

    Had to stop a start-up because I found this same thing. They also ran 3 low voltage wires to condenser and not 4. When I asked, where is the 4th wire, I was told, "we looked at the drawing and saw 4...
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