Figure 80 User Menus-Condenser Timer Screen - Emerson Liebert CRV User Manual

U805 interval Days—Selects the interval day(s) low noise operations will be available for the
condenser fan. When the parameter is set to YES the low noise operation is selected. When set to NO
the low noise will be disabled even if an interval time is set below.
U806 Interval From—Selects the time of day that the low noise feature will be enabled between
00:00 and 24:00.
U807 Operating Mode (0=LN, 100=HE)—The first value represents the fan speed during low noise
operation. The second value represents the fan speed during normal or high efficiency operation. The
first value is linked to U818 and the second to U819. An example of low noise programming and how
the lines function together is provided on page 105. The selectable ranges for LN and HE is 0-100%.
Also, a read-only column is available to show the status of the low noise selection. The status will be
shown as:
• 0 = Inactive
• 1 = Active-Interval
• 2 = Active-Whole Day
Figure 80 User menus—Condenser timer screen-page 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.
NOTE
If the compressor is in operation and/or the fan is in a low noise operation the request to
reverse the fans will be ignored. Fan reversal will resume when the next reversal time request is
made. This is safeguard to prevent a high pressure condition. Coordinate fan reversal time and
date with unit off conditions where applicable.
U815 Reverse Fan At:—Defines what time the fan reversal will be performed in 00:00 to 24:00.
U816 Reversal Duration—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—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 the compressor is 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 (Low Noise)—This line is linked to U807 0=LN column and defines
the maximum speed during Low Noise operation.
U819 Max Speed at OpMode 100 (High Efficiency)—This line is linked to U807 100=HE column
and defines the maximum speed during normal or High Efficiency operation.
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Liebert CRV 104
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Liebert iCOM Control