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Figure 3
Model number nomenclature—Outdoor air-cooled prop fan condensing units
PF = Prop Fan Condensing Unit with Hot Gas Bypass
0 = Std. Sound Level
Z = Quiet-Line
PFH
0
— = Standard Coil
C = Coated Coil
Figure 4
Model number nomenclature—Water/glycol-cooled condensing units
MC = Liebert Mini-Mate2
indoor condensing
units
D = Disconnect Switch
0 = No Disconnect Switch
MC
D
®
™
Liebert
Mini-Mate2
Nominal Capacity, kBtuh
37
A
P = 208/230V - 1ph - 60Hz
Y = 208/230V - 3ph - 60Hz (3-ton only)
A = 460V - 3ph - 60Hz (3-ton only)
B = 575V - 3ph - 60Hz (3-ton only)
S = 220V - 1ph - 50Hz (3-ton only)
M = 380/415V - 3ph - 50Hz (3-ton only)
Nominal Capacity
26 = 2-ton, 60Hz
37 = 3-ton, 50Hz
38 = 3-ton, 60Hz
Cooling Method
W = Water/Glycol
38
W
Head Pressure Controls
2 = 2-Way Standard Pressure Water Reg Valve
3 = 3-Way Standard Pressure Water Reg Valve
D = 2-Way High-Pressure Water Reg Valve
T = 3-Way High-Pressure Water Reg Valve
4
Cooling Method
A = Air-Cooled
—
P
Supply Power
P = 208/230V - 1 ph - 60Hz
X = 277V - 1ph - 60Hz
S = 220V - 1ph - 50Hz (3-ton only)
A = 460V - 3ph - 60Hz (3-ton only)
Y = 208/230V - 3ph - 60Hz (3-ton only)
M = 380/415V – 3ph-50Hz (3-ton only)
2
A
Product Number Nomenclature
Refrigerant
7 = R-407C
L
7
L = 95°F Ambient,
Liebert Lee-Temp
H = 105°F High Ambient,
Liebert Lee-Temp
H
7
Refrigerant
7 = R-407C
H = Hot Gas Bypass
™
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Table of Contents
Troubleshooting
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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.
This answer is automatically generated