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CAUTION
!
Risk of leaking water. Can cause equipment and building damage.
This unit requires a water drain connection. It may also require an external water supply to
operate. Improper installation, application and service practice can result in water leakage
from the unit. Water leakage can result in severe property damage and loss of critical data
center equipment. Do not locate unit directly above any equipment that could sustain water
damage. Emerson recommends installing leak detection equipment for unit and supply lines
and in the secondary drain pan. Check drain lines periodically for leaks, sediment buildup,
obstructions, kinks and/or damage and verify that they are free running.
CAUTION
!
Risk of sharp edges, splinters and exposed fasteners. Can cause injury.
Only properly trained and qualified personnel wearing appropriate safety headgear, gloves,
shoes and glasses should attempt to move the unit, lift it, remove packaging from or prepare
the unit for installation.
NOTICE
Risk of a leaking coil due to freezing and/or corrosion. Can cause equipment and serious
building damage.
Cooling coils and piping systems that are connected to open cooling towers or other open
water/glycol systems are at high risk for freezing and premature corrosion. Fluids in these
systems must contain the proper antifreeze and inhibitors to prevent freezing and premature
coil corrosion. The water or water/glycol solution must be analyzed by a competent water
treatment specialist before startup to establish the inhibitor requirement. The water or
water/glycol solution must be analyzed every six months to determine the pattern of inhibitor
depletion. The complexity of water-caused problems and their correction makes it important
to obtain the advice of a water treatment specialist and follow a regularly scheduled
maintenance program.
NOTICE
Risk of damage from forklift. Can cause unit damage.
Keep tines of the forklift level and at a height suitable to fit below the skid and/or unit to
prevent exterior and/or underside damage.
NOTICE
Risk of improper storage. Can cause unit damage.
Keep the Liebert Mini-Mate2 upright, indoors and protected from dampness, freezing
temperatures and contact damage.
®
™
Liebert
Mini-Mate2
2
Important Safety Instructions
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Table of Contents
Troubleshooting
Need help?
Do you have a question about the Mini-Mate2 MMD24E and is the answer not in the manual?
Questions and answers
Low suction & head pressure w/ glycol system & free cooling. Inlet cooling water 56 degrees, 10# diff. press, recovered refrigerant & weighed in proper charge 96oz.
Low suction and head pressure in a Liebert Mini-Mate2 MMD24E with a glycol system and free cooling could be caused by:
1. Low Glycol Solution Level – Insufficient glycol in the system can reduce heat transfer efficiency.
2. Improper Glycol Concentration – Incorrect glycol mixture can affect system performance.
3. Low Water/Glycol Temperature – If the temperature is too low, the free-cooling coil may take over, reducing suction and head pressure.
4. Restricted Flow in the System – Blockages or closed valves in the glycol piping can limit circulation.
5. Malfunctioning Three-Way Valve – If the free-cooling valve does not function correctly, it may divert flow improperly.
6. Dirty or Clogged Coil – A buildup of debris on the free-cooling coil can restrict heat exchange.
7. Air in the System – Entrapped air can reduce efficiency and cause pressure issues.
8. Pump Issues – A faulty or improperly sized pump may not circulate glycol effectively.
Checking glycol levels, valve operation, and system cleanliness can help diagnose the issue.
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