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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...

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...

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...

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...

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,...

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...

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...

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...

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...

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...

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...

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...

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,...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...