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.
The fastest
chiller restart after
power failure
QUICK START
FEATURE
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.
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):
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:
• 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.
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 chilled-
water 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%.
LCHWT:
Standard Logic
Setpoint
Quick Start with UPS
10 minutes
12 seconds
3 minutes
2 seconds
Time from power failure (minutes)
Temperature (degrees F)
–2 0 2 4 6 8 10 12
40
42
44
46
48
50
52
54
56
58
60
Standard Chiller
Quick Start without UPS
Quick Start with UPS
249 seconds =
about 4 minutes
115 seconds =
almost 2 minutes
60 seconds
15 sec.
power failure
Length of power failure (seconds)
Time to restart from power loss (seconds)
0 5 10 20 25 30 35
60
40
80
100
120
140
160
180
200
220
240
260
280
300
320
340
Additional steps required if UPS not used
*Coastdown time for a
500-ton chiller
Without UPS With UPS
60 seconds
to restart
with UPS
115 seconds
to restart
15 25
Power
failure
VSD
precharge
60
15
60
75 25
Coastdown*
Coastdown*
VSD
precharge
Power
failure
OptiView Chiller
control panel reboot
Timeline from loss of power
Figure 1: Required steps when power interruption occurs
with and without UPS.
Figure 2: Restart times for 500-ton chiller.
Figure 3: Time to re-establish LCHWT for 500-ton chiller
at low load.
Printed on recycled paper.
PUBL-6113 (909)
© 2009 Johnson Controls, Inc. P.O. Box 423, Milwaukee, WI 53201 Printed in USA
www.johnsoncontrols.com
/
