Quick Start Screen; Figure 45 - Quick Start Screen (Software Version C.opt.01.21.307 And Later) - York YK Series Operation Manuals

FORM 160.54-O1
ISSUE DATE: 9/10/2014
(SOFTWARE VERSION C.OPT.01.21.307 AND LATER)

FIGURE 45 - QUICK START SCREEN (SOFTWARE VERSION C.OPT.01.21.307 AND LATER)

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.
• 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
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION

QUICK START SCREEN

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 in Modbus Protocol Con-
figuration or a Medium Voltage Variable 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 enabled with an ADMIN pass-
word by a qualified Service Technician using the pro-
cedure in OptiView Control Center – Service Instruc-
tions (Form 160.54-M1). Once enabled, all setpoints
and parameters related to this feature are displayed on
this screen, when logged in at SERVICE access level.
If Heat Pump Duty is enabled, Quick Start is only avail-
able when the Heat Pump Operational mode setpoint
is set to Cooling. When Heat Pump Duty Operational
mode is set to Heating, Quick Start is automatically
Disabled.
Service Technicians refer to OptiView Control Center
– Service Instructions (Form 160.54-M1) for complete
explanation of this feature.
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