York YK Centrifugal Water Chiller User guide

Brand: York

Model: YK Centrifugal Water Chiller

Type: User guide

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

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

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

75 25

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)

www.johnsoncontrols.com

York YK Centrifugal Water Chiller User guide

York YK Centrifugal Water Chiller User guide

York YK Centrifugal Water Chiller User guide

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