From tigwiki

[edit] Contact Information

• General TIGRESS: Greg Hackman, 604-222-7441
• Technical TIGRESS: Randy Churchman, 604-222-1047 x6239
• Site Mechanical Engineer: Curtis Ballard, 604-645-0782
• Site Electrical Engineer: Franco Mamarella, 604-222-7412
• MRO & Warranty: Broadway Refrigeration (Vendor), 604-255-2461, ask for Daryl McDonnell

[edit] Specifications

Liebert DH219A-AA00 Downflow Air Conditioner

• 15 Ton Capacity
• Dual Compressor
• Water Cooled
• Copper or Stainless Steel on All Wetted Parts
  • Unit was delivered with CAST-IRON caps on heat exchanger
  • These were nickel-plated and reinstalled in post-installation service
• See TRIUMF Purchase Order TR-164670

[edit] Documentation

All documentation supplied by Liebert has been scanned and posted on the Plone repository.

[edit] FAQ

[edit] Who do I call if something goes wrong?

Scroll up to the Contacts section.

[edit] I push the "On" button. It comes on for a really short time and then turns off again.

Release the on button more rapidly.

I have found that if you hold any of the buttons down for more than about 1/2 second, the unit interprets that as multiple button presses, just like holding down a key on (most) computer keyboards. In particular, in the time it takes for you to press the button, wait for the unit to roar to life, and release the button -- it already thinks you've held it down long enough to be interpreted as a multiple keypress. So don't wait for the unit to turn on before you release the button.

[edit] It won't restart and keeps showing a "Head Pressure" error.

Left panel of air conditioner removed, revealing compressors. Fingers point to high head-pressure sensors.

Close-up of high head-pressure sensors. Finger points to reset pushbutton switch.

The cause and solution to this problem is described in the Liebert Maintenance and Operation Manual, on Page 45 (Section 6.1.4).

• Leave the main power to the unit on, and push the ON button on the front control panel.
• Remove the LEFT side panel. You need to turn the hex-head screws about 1/4 to 1/2 turn to disengage them, then the panel comes off easily.
• Find the high head-pressure sensors and reset button. (see pictures to right).
• Depress the reset button on the top compressor. Hold it down until the compressor roars into action. It will make a loud noise and shudder violently. Believe it or not, that's OK.
• Repeat for the second compressor.
• Reinstall the left side panel.

[edit] What happens if the unit fails?

There is no direct communication between the unit and anything else. The most expensive and irreplaceable electronics in the shack are protected by the State-of-Health system.