Service Menu Parameters
64
Figure 46 Setpoints parameters screen - Page 4
DT between Room / Outdoor Type
—This feature is only used on HPM products.
DT between Room Air / Outdoor
—This feature is only used on HPM products.
DT between Room / FC Type
—This parameter determines the method to activate the water circuit
on Dual Cool and Freecool units. When set to “Contact” a dry contact closure can be used to activate
the free cooling circuit. When set to “Value” the delta between the water temperature of the freecool
circuit and the actual room temperature are compared.
DT between Room Air / FC Fluid
—This parameter sets the delta between the actual room temper-
ature and the free cooling fluid temperature to determine if cooling can be provided.
Minimum CW Temp
—This parameter enables the temperature at which freecooling can operate
independently without assistance of the compressor circuit.
Minimum CW Temp Value
—This parameter sets the water temperature at which 100% freecooling
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
—This parameter is the temperature that turns off the freecooling
circuit when the water temperature is too low. This setting prevents frost from building up on the
freecooling pipes when the outdoor ambient is extremely low.
Transition Change
—This parameter is applied over the “Cooling Filter at 0% / 100%” when the
cooling signal goes to / comes from dehumidification. This will smooth the cooling capacity changes
between dehumidification and cooling.
SETPOINTS (pg 4 of 6)
to change parameter
to confirm
to select parameter
for next/previous unit
then
UNIT 01
PASSWORD (Actual Level 0)
????
DT between Room / Outdoor Type
Disable
DT between Room Air / Outdoor
°F
DT between Room / FC Type
Disable
DT between Room Air FC Fluid
°F
Minimum CW Temp
Disable
Minimum CW Temp Value
°F
Lockout FC at FC Fluid below
48°F
Transition Change
100 .0%
S134
S135
S136
S137
S138
S139
S140
S141
S142
S143
S144
Summary of Contents for Liebert Challenger 3000
Page 2: ......
