Operating Status; Figure 40 - Main Screen - York YHAU-CW Manual

FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018

FIGURE 40 - MAIN SCREEN

The Main Screen displays the equipment status (chiller
start or stop, operating, pumps ON or OFF, purge pump
ON or OFF, and chilled, and cooling water pumps
ON or OFF). Also, the operating status of the various
modes of chiller operation.

OPERATING STATUS

On the upper left of the screen below the LOCAL and
REMOTE buttons is a list of options. Each has a lamp
to indicate on or off for the following:
• Startup: Lights if the chiller is ready to start.
Light is off if the chiller is stopping or if it is not
ready to start.
• Steam V Lo Hold: The steam control valve or
steam drain control valve low hold light is on if
the steam control valve low hold is operating.
The steam control valve stays in the low position
before the automatic temperature control process
runs.
JOHNSON CONTROLS
MAIN SCREEN
• Temp. Control: Light is lit if the temperature
control of the microcomputer panel changes to
RUN status. Turns off if the chiller stops.
• Thermo OFF: Lights if the chilled water tem-
perature falls to the automatic stop temperature.
Turns off when the temperature rises enough to
allow an automatic restart.
• Load Limit: Light is lit if the load restriction acti-
vates due to the cooling water temperature, refrig-
erant temperature, or HG temperature or pressure
is higher than the set point. Light turns off when
the load restriction is removed.
• Dilution: Light is lit during the dilution operation
after the chiller stops. It turns off when the dilu-
tion operation is complete.
• ChilledW Pump: indicates the temperature of the
chilled water.
• CoolingW Pump: indicates the temperature of
the cooling water.
SECTION 6 – OPERATION
LD20042_UL
107
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