Figure 89 Setpoints Screen - Emerson Liebert iCOM Manual

Service Menu Parameters
S175 Display Off and BDR—When the back draft damper is enabled, different modes can activate
this feature. Remote Off, Display Off, BMS Off and Local Off can all be set to activate the back draft
damper operation. To do so, press the I/O key at the unit to put the unit is a display OFF condition.
S176 BMS Off and BDR—When the back draft damper is enabled, different modes can activate this
feature. Remote Off, Display Off, BMS Off and Local Off can all be set to activate the back draft
damper operation. This is done by sending a remote OFF signal from BMS to the unit to be remotely
OFF.
S177 LOC Off and BDR—When the back-draft damper is enabled, different modes can activate this
feature. Remote Off, Display Off, BMS Off and Local Off can all be set to activate the back draft
damper operation. This is done by sending a local OFF signal from the unit by pressing I/O key.
Figure 89 Setpoints screen, page 8 of 9
S178 SCR Control Type—Sets the control type for the SCR reheats. If set to "Standard," then the
reheats will modulate when the temperature is below setpoint based on the control settings. If this
parameter is set to "Tight" control, then one compressor will be locked on and the reheats will
modulate to offset the cooling capacity.
S179 Fanspeed Transition Filter—Controls how quickly the fan speed changes between different
modes of operation. Example: If the fans are operating based on a call for reheat which is normally
100% fan speed and the reheats are turned Off or no longer needed, then the fan speed would
instantly change if this filter is not applied, which may cause instability in the fan speed control. This
filter helps with the transition to avoid overshoot. This parameter should only be adjusted by a
factory service trained technician.
S180 Start 1st Compressor At—Sets the activation point of the compressor. This parameter can be
used when set to "Tight" control.
S181 Stop 1st Compressor At—Sets the deactivation point of the compressor. This parameter can
be used when set to "Tight" control.
S182 1st Compressor Stop Delay—Sets the delay when the stop compressor setpoint for the first
compressor is met.
S183 Start 2nd Compressor At—Sets the activation point of the second compressor. This
parameter can be used when set to "Tight" control.
S184 Stop 2nd Compressor At—Sets the deactivation point of the second compressor. This
parameter can be used when set to "Tight" control.
S185 2nd Compressor Stop Delay—Sets the delay when the stop compressor setpoint for the
second compressor is met.
S186 Cycle Time—Set at the factory and should be changed only by an authorized Emerson
representative.
S187 SCR Factor—Set at the factory and should be changed only by an authorized Emerson
representative.
S188 Actual SCR Request—Displays the actual SCR reheat being requested.
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115 Liebert iCOM for Liebert DSE