Emerson Liebert iCOM Manual De Usuario

S135 DT1 (Room/Outdoor) Type—Sets the activation point of the ambient dry bulb outdoor 

temperature as it relates to either an indoor actual temperature or temperature setpoint. See 3.5.2 - 

Liebert Air Economizer Control Settings for more information.
S136 DT1 (Room/Outdoor) Value—Field-adjustable setpoint or temperature. Type (setpoint or 

temperature) is based on the setting on S135.
S137 DT2 (Room/FC Fluid) Type—Determines the method to activate the water circuit on 

Dual-Cool and free-cool units. It may be set to CONTACT, TEMP or SET. CONTACT which uses a 

dry contact to activate the free-cooling circuit. TEMP uses a sensor reading that can then be 

compared to the return temp to see whether free-cooling is possible. SET compares the temperature 

SET to the free-cooling sensor to determine free-cooling availability.
S138 DT2 (Room/FC Fluid) Value—Sets the delta between the actual temperature and fluid 

temperature that must be met before free-cooling will occur. 

Example: Actual Temperature = 75°F
Free-cooling Temperature = 70°F
DT2 Value = 4
Since the difference between the free-cooling fluid and the actual temperature is 5°F and the DT2 

value is set to 4°F, then free-cooling would be utilized.

S139 Minimum CW Temp—Enables the temperature at which free-cooling can operate 

independently without assistance of the compressor circuit(s).
S140 Minimum CW Temp Value—Sets the water temperature at which 100% free-cooling can be 

provided to handle the full room load. When the fluid temperature is below this setting, then the 

compressors will no longer turn On until the water temperature is above the minimum CW Temp.
S141 Lockout FC at FC Fluid below—Prevents frost from building up on the free-cooling pipes 

when the outdoor ambient is extremely low by turning Off the free-cooling circuit when the water 

temperature is too low.