Capacity Control Screen; Figure 15 - Capacity Control Screen - York YK Style H Operation Manual

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

FIGURE 15 - CAPACITY CONTROL SCREEN

OVERVIEW
This screen applies to all VSD drive type chillers.
Some of the fields will not be visible depending upon
what capabilities, drive and mode of operation the unit
is in. This screen allows Manual/Auto control of the
VSD, PRV and Hot Gas Bypass if logged in at the Ser-
vice access level. This screen also serves as a gateway
to subscreens.
DISPLAY ONLY
Evaporator Pressure
Displays the pressure in the evaporator.
[Evaporator Pressure] Override Threshold
Displays the evaporator pressure setpoint below which
the low evaporator pressure capacity control override
takes effect.
Condenser Pressure
Displays the pressure in the condenser.
JOHNSON CONTROLS

CAPACITY CONTROL SCREEN

[Condenser Pressure] Override Threshold
Displays the condenser pressure setpoint above which
the high condenser pressure capacity control override
takes effect.
Discharge Superheat
Displays the discharge superheat temperature.
[Discharge Superheat] Override Threshold
Displays the discharge superheat setpoint below which
the low discharge superheat capacity control override
takes effect to prevent slugging the compressor with
liquid.
Input Current % FLA
Displays the percent of useful job full load current
presently supplied to the chiller, determined from the
highest of the three phase Input Currents/(Input Job
FLA setting/0.9). Displayed with Raptyr drive only.
Override Threshold
Displays the active input current percent limit, which
is the minimum of Local Input Current Limit, Remote
Input Current Limit, and Pulldown Current Limit or
BAS (ISN) current limit.
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
LD19453
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