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Service Menu Parameters
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Figure 50 Setpoints screen, page 4 of 6
DT between Room / Outdoor Type—This feature is used only on Liebert HPM products.
DT between Room Air / Outdoor—This feature is used only on Liebert HPM products.
DT between Room / FC Type—Determines the method to activate the water circuit on Dual-Cool
and free-cool units. When this parameter is set to “Contact,” a dry contact closure can be used to
activate the free cooling circuit. When this parameter is set to “Value,” the delta between the water
temperature of the free-cool circuit and the actual room temperature are compared.
DT between Room Air / FC Fluid—Sets the delta between the actual room temperature and the
free-cooling fluid temperature to determine if cooling can be provided.
Minimum CW Temp—Enables the temperature at which free-cooling can operate independently
without assistance of the compressor circuit.
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.
Lockout FC at FC Fluid below—The temperature that turns off the free-cooling circuit when the
water temperature is too low. This setting prevents frost from building up on the free-cooling pipes
when the outdoor ambient is extremely low.
Transition Change—Applied over the “Cooling Filter at 0% / 100%” when the cooling signal makes
the transition between cooling and dehumidification. This will smooth the cooling capacity changes
between dehumidification and cooling.