UnIT fUnCTIons
www.DaikinApplied.com 69 IOM 1206-7 • TRAILBLAZER
™
MODEL AGZ CHILLERS
Compressor Starts Per Hour
Since the compressor cycle timers are not maintained through
power cycling, a limitation on the number of starts per hour
will be added. Each compressor will be allowed six starts in an
hour.
If a compressor start is being delayed due to this limitation,
it can be cleared by using the existing Clear Cycle Timers
setting.
The following table shows the approximate best case scenario
for start time and loading time with the RapidRestore
®
operation.
Table 60: RapidRestore
®
Mode Response Times
# of compressors
Maximum
Restart Time
Time to
Fully Loaded
Power lost
and restored
4
125 sec.
220 sec.
6 280 sec.
Backup
chiller with
constant
power
4
20 sec.
115 sec.
6 175 sec.
Sound Reduction
A special mode of operation is available for E vintage models
with two fan VFD’s per circuit, which reduces sound levels by
limiting condenser fan speeds. This mode can be enabled and
disabled via the Sound Reduction Enable setting.
Scheduling
When enabled, sound reduction will become active based on
a daily schedule. This schedule is congurable and allows a
start time and duration to be selected for each day of the week.
Start times can be set in one hour increments and duration can
be set in hour increments.
Sound reduction will be active if the controller time is within the
time block determined by the settings for the current day.
Operation When Active
When sound reduction is active, the condenser fans will be
limited to the speed selected by the fan speed limit set point.
If the Sound Reduction priority is set to ‘sound’, the fan speed
limit is applied at all times regardless of operating conditions. If
conditions are such that condenser pressure is elevated a high
pressure stage down may occur, which would effectively lower
the pressure into a safe zone but capacity of the chiller would
be limited.
If priority is set to ‘capacity’, the fan speed is allowed to exceed
the limit as needed to avoid high condenser pressure stage
downs, which allows the chiller to maintain a higher operating
capacity.
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