Figure 80 Condenser Timer Screen - Emerson Liebert iCOM Manual

User Menu Parameters
Figure 80 Condenser timer screen—page 2
U813 Select Condenser 2—This menu selection toggles between condenser 1 and 2. When "Select
Condenser 2" is shown the data below is for condenser 1. When "Select Condenser 1" is shown, the
data below is for Condenser 2.
U814 Fan Reversal Every x Days—Selection defines the numbers of days between fan reversals.
This parameter is adjustable from 1-100 days. The default set value is 0 days = OFF. Fan reversal can
only be preformed with both compressors satisfied. Fan reversal interval should be preformed during
standby periods. If the compressor is operating, the control with skip the scheduled reversal and retry
the next interval day. If the scheduled fan reversal is missed, the control will look for the next
available time to do a fan reversal where the compressors calls are met and initiate the reversal.
U815 Reverse Fan At:—Selection defines when the fan reversal will be performed in 00:00 to 24:00.
U816 Reversal Duration—Selection defines the length of time the fan(s) will be operated in reverse.
This parameter is adjustable from 0-999 seconds. The default set value is 60 seconds.
U817 Reverse Fans Now—Selection performs a rotation when parameter is set to "YES." When
selection is set to "YES" the parameter will automatically change back to "NO" when the timer, U816,
has elapsed. NOTE: If one or both of the compressor(s) are in operation and/or the fan is in a low noise
operation the request to reverse the fans will be ignored. When the conditions above are met to
reverse the fans the control will perform a reversal.
U818 Max Speed at OpMode 0 (LN)—Linked to U807 0=LN column and defines the maximum
speed during Low Noise operation.
U819 Max Speed at OpMode 100 (HE)—Linked to U807 100=HE column and defines the
maximum speed during normal or High Efficiency operation.
U820 Current Max Speed—Parameter show the status of the actual maximum fan speed.
Configuring Low Noise Operation
First, determine the days and time of day low noise is required. This will be set U806 through U808
respectively. Second, determine the maximum fan speed setting during low noise operation.
Here, the user does not want fan speed to exceed 35% max speed from 10 pm to 8 am weekdays.
1. Set U805 Mon-Fri columns to yes.
2. Set U806 interval time from 22:00 to 8:00
3. U807 = 0% / 100%
4. U818 = 35% (Max fan speed low noise)
5. U819 = 100% (Max fan speed during normal operation)
The settings above result in a 35% maximum speed when the timer is active (i.e., at night) and will
operate the fan between 0 and 100% maximum speed of when the timer is inactive (normal operation,
during daytime).
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105 Liebert iCOM for Liebert DSE