The fastest
chiller restart after
power failure
QUICK START
FEATURE
Ensure the fastest chiller restarts with Quick Start feature
Temperature-sensitive operations such as data center,
pharmaceutical, and manufacturing facilities require constant
cooling for equipment and processes. If power fails and cooling
is interrupted, critical operations may also fail — risking millions
of dollars in equipment failure and operational downtime.
Now there‘s a sure way to reduce the risk of cooling disruption —
the Quick Start feature from Johnson Controls. This feature for
YORK® centrifugal chillers with OptiSpeed™ variable-speed drive
can save you both time and money by:
• Reducing time for chiller restart after power failure
• Rapidly re-establishing chilled-water temperature
• Keeping process equipment cooled
• Reducing risks of expensive downtime
• Providing a faster initial start, too
Reduce restart time to seconds
After power is interrupted, it can take a standard centrifugal
chiller many minutes to restart. But with the Quick Start feature,
once power is restored, the chiller can restart in as little as
25 seconds!
However, we understand that your application does not just
require the chiller to restart, but needs the fastest delivery of
chilled water at the design temperature. In Figures 1, 2, and 3
on the next page, restart times are measured from the moment
the power fails, and the backup generator is assumed to have
established emergency power in 15 seconds.
Quick Start feature without UPS is fast:
• Once emergency power is established, the chiller can restart
as soon as the OptiView™ control panel reboots (75 seconds)
and the OptiSpeed drive precharges (25 seconds), assuming
coastdown of the compressor has been completed. If
emergency power is available after 15 seconds, the chiller
will restart in 115 seconds after power was lost.
Quick Start feature with UPS is faster:
15
25
Power
VSD
failure precharge
60
Coastdown*
15
Power
failure
60 seconds
to restart
with UPS
340
320
300
280
260
240
220
200
180
160
140
120
100
80
60
40
249 seconds =
about 4 minutes
Standard Chiller
Quick Start without UPS
Quick Start with UPS
115 seconds =
almost 2 minutes
60 seconds
0
5
10
15 sec.
20
power failure
25
30
35
Length of power failure (seconds)
Figure 2: Restart times for 500-ton chiller.
Proven performance
With over 100 Quick Start installations in the field, you get
the peace of mind knowing your chillers — and your operation —
can be protected from the consequences of power failure by
Johnson Controls.
For details on how the Quick Start feature can protect your
application, contact your nearby Johnson Controls sales
office today.
60
Coastdown*
OptiView Chiller
control panel reboot
75
60
VSD
115 seconds
precharge to restart
Additional steps required if UPS not used
*Coastdown time for a 500-ton chiller
Figure 1: Required steps when power interruption occurs
with and without UPS.
Faster restart restores specified leaving chilled-water
temperature quicker
The Quick Start feature not only minimizes chiller restart time,
it reduces the time required for the re-establishment of the
design leaving chilled-water temperature (LCHWT). The Quick
Start feature utilizes accelerated loading logic, with the inlet
vanes fully open, to re-establish the specified leaving chilledwater temperature faster. While the actual time to re-establish
the LCHWT will depend on plant design, compressor size, and
operating conditions, a chiller equipped with the Quick Start
option can cut the time by as much as 70%.
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www.johnsoncontrols.com
LCHWT:
Standard Logic
Setpoint
Quick Start with UPS
58
25
Temperature (degrees F)
With UPS
Without UPS
Timeline from loss of power
• The UPS keeps the OptiView and OptiSpeed control circuits
energized and the oil heater operative until the emergency
generator is activated, which eliminates the need for control
panel reboot. The chiller will restart in 60 seconds after
power was lost.
Time to restart from power loss (seconds)
Faster restarts due to smarter power management
The Quick Start feature is available in two configurations,
for use with or without an uninterruptible power supply (UPS):
56
54
52
50
48
10 minutes
12 seconds
3 minutes
2 seconds
46
44
42
40
–2
0
2
4
6
8
Time from power failure (minutes)
Figure 3: Time to re-establish LCHWT for 500-ton chiller
at low load.
10
12