Quick Start Screen; Figure 43 - Quick Start Screen - York YK Style H Operation Manual

FORM 160.76-O2
issue date: 6/15/2015

FIGURE 43 - QUICK START SCREEN

OVERVIEW
The Quick Start feature is useful in data center and
process control applications where it is desirable to re-
establish cooling as fast as possible after a shutdown
or power failure. This feature, when enabled, allows
quicker starts and restarts than normal control. It does
this by reducing the time cycle for chiller restart and
once running, loading the chiller as fast as possible.
After the chiller is running and has met a specified
setpoint or a specified period of time has elapsed, con-
trol returns to normal.
Quick Start feature has two different start modes:
• Quick Restart – When a chiller shutsdown, if
certain conditions are met at the completion of
coastdown (and within 30 seconds thereafter), the
VSD is started immediately with no prelube. The
vanes are given a constant open pulse and after the
VSD achieves its start frequency, the speed ramp
rate is faster than with normal control.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION

QUICK START SCREEN

• Quick Normal Start – If the conditions for a Quick
Restart are not met, the next time the chiller is
started, it has a prelube period just like a normal
start, however the vanes will begin to open at the
beginning of prelube, instead of waiting until Sys-
tem Run. At the completion of prelube, the VSD
is started and after the VSD achieves its Start Fre-
quency, the speed ramp rate is faster than with
normal control.
In order to use this feature, the chiller must be equipped
with a Variable Speed Drive or a Medium Voltage Vari-
able Speed Drive. The low inrush current of a VSD
allows more starts per hour and allows the chiller to
start with a more open vane position. It must be en-
abled with an ADMIN password by a qualified Ser-
vice Technician using the procedure in OptiView Con-
trol Center – Service Instructions (Form 160.76-M1).
Once enabled, all setpoints and parameters related to
this feature are displayed on this screen, when logged
in at SERVICE access level.
Service Technicians refer to OptiView Control Center
– Service Instructions (Form 160.76-M1) for complete
explanation of this feature.
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