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FORM 155.21-O1 (615)
59
JOHNSON CONTROLS
2
Condenser Liquid Flow Switch Opened
The condenser liquid flow switch has been opened
continuously for 30 seconds. If the chiller was in RUN
status, the chiller initiates limited dilution. If the con-
denser liquid pump was commanded to run in manual
mode from the control panel and the unit was not in
RUN status, the chiller remains in standby.
Recovery Conditions
• If the chiller was in RUN status at the time of the
event, and limited dilution has timed out (4 hours),
when the unit switch is taken to STOP/RESET posi
-
tion the chiller becomes ready to start.
• If the chiller was in RUN status at the time of the
event and the unit switch is taken to STOP/RESET
position before limited dilution has timed out (4
hours) unit initiates dilution then the chiller becomes
ready to start.
• If the chiller was not in RUN status at the time of
the event, when the switch contacts close or call
for manual pump operation is ceased and the unit
switch is placed to STOP/RESET position the chiller
becomes ready to start.
Dilution Cycle Interrupted-Chilled Water Off
The chilled liquid flow switch has not closed during
the first 30 seconds of normal dilution or opened for 2
continuous seconds during dilution. Limited dilution
initiates.
Recovery Condition
• After the chiller condition is assessed and the prob
-
lem corrected, the unit can be restarted. To restart
the unit, press the UNIT switch to the STOP/RESET
position, then press the WARNING RESET key,
then initiate a start.
Dilution Cycle Interrupted-Cond Water Off
The condenser liquid flow switch has not closed during
the first 30 seconds of normal dilution or opened for 30
continuous seconds during dilution. Limited dilution
initiates.
Recovery Condition
• After the chiller condition is assessed and the prob
-
lem corrected, the unit can be restarted. To restart
the unit, press the UNIT switch to the STOP/RESET
position, then press the WARNING RESET key,
then initiate a start.
Dilution Cycle Interrupted - Switch 3F Opened
This shutdown occurs when 3F is open at least for
"Chiller Refrigerant level shutdown delay setpoint"
when the unit is performing a dilution cycle (only ap-
plicable to unit equipped with Buffalo Pumps). The unit
will start a limited dilution cycle after the refrigerant
pump shutoff delay expires.
Recovery Condition
• When the unit switch is placed in the STOP/RESET
position, it attempts a dilution cycle ready to start.
Generator Hi-Press Analog PT1 > 672 Mmhg
The generator shell pressure sensed at PT1 is greater
than or equal to 672 mmHG. If the chiller was in RUN
status, the chiller initiates a dilution cycle.
Recovery Conditions
• If the chiller was in RUN status at the time of the
event, then when the shell pressure at PT1 is less
than 672 mmHg and the unit switch is taken to
STOP/RESET position the chiller continues dilution
if it was in progress or becomes ready to start.
• If the chiller was not in RUN status at the time of
the event, when the shell pressure at PT1 is less
than 672 mmHg and the unit switch is placed to
STOP/RESET position the chiller becomes ready
to start.
Gen Hi-Temp Analog Switch RT3 > 330ºF (166ºC)
The strong solution temperature from the generator
sensed at RT3 is greater than or equal to 330ºF (165.6ºC).
If the chiller was in RUN status, the chiller initiates a
dilution cycle.
Recovery Conditions
• If the chiller was in RUN status at the time of the
event, then when the strong solution temperature
from the generator sensed at RT3 is less than or
equal to 329ºF (165ºC) and the unit switch is taken to
STOP/RESET position the chiller continues dilution
if it was in progress or becomes ready to start.
• If the chiller was not in RUN status at the time of
the event, when the strong solution temperature from
the generator sensed at RT3 is greter than or equal
to 329ºF (165ºC) and the unit switch is placed to
STOP/RESET position the chiller becomes ready
to start.