Figure 84 Service Menus-Setpoints Parameters Screen - Emerson Liebert CRV User Manual

Figure 84 Service menus—Setpoints parameters screen - Page 4
S135 MIN at CFC for EC Fan—Provides an offset to the minimum fan speed at the minimum call
for cooling. When set to 0 / 100 the MIN speed is reached when the call for fan is at 0%; the STD speed
is reached when the call for fan reaches 100%.
For example, if the minimum is set to 20 and the standard is set to 90, the fan speed MIN is reached
earlier (the fan operates on lower speed compared to the calculated call for fan), and the STD speed is
reached faster when compared to the calculated call for fan.
S136 STD at CFC for EC Fan—Provides an offset to the minimum fan speed at the minimum call
for cooling. When set to 0 / 100, the MIN speed is reached when the call for fan is at 0%; the STD
speed is reached when the call for fan reaches 100%.
S137 High Temp Limit Approach—Sets the sensor that controls the fan speed maximum override.
This can be set to 0 = Disabled, 1 = Supply Sensor and 2 = Return Sensor.
NOTE
The Liebert CRV fans are oversized and can be used to help protect equipment in emergency
situations, such as high temperature and a single fan failure.
S138 High Temp Limit Approach at—Sets the temperature (0 - 10°F) when the units fan speed
can operate above the maximum speed.
Defines a temperature differential below the High Supply or Return Temp Limit where the fan speed
would increase from Fanspeed Setpoint STD to Fanspeed MAX, which is defined on _A146 Analog
Out 1 High Limit.
S144 Ball Valve Setpoint Offset—Adjusts the operating compressor discharge pressure (0 - 70 psi
[0.0 - 4.8 bar]) by changing the targeted range of control.
Unit Diary—Shows program changes and maintenance performed on the unit.The Unit Diary serves
as a note pad, where information can be added by an Emerson Network Power
technician.
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