York OPTIVIEW YIA D - Page 60

JOHNSON CONTROLS
60
FORM 155.21-O1 (615)
OptiView Control Center
Generator Hi-Press Digital Switch HP1 Opened
The generator high pressure digital safety switch opened
(Shutdown = 710 mmHg Abs). 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 digital safety contacts close
(Reset = 40 mmHg Abs) 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 digital safety contacts close (reset
= 40 mmHg Abs) and the unit switch is placed to
STOP/RESET position the chiller becomes ready
to start.
Gen Hi-Temp Digital Switch HT1 Opened –
Man Reset
The generator high temperature digital safety switch
opened (Shutdown = 337ºF/169ºC). 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 digital safety contacts close
(Reset = 333ºF/167ºC) 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 digital safety contacts close
(Reset = 333ºF/167ºC) and the unit switch is placed
to STOP/RESET position the chiller becomes ready
to start.
High Concentration in Strong Solution
This shutdown occurs when the strong solution con-
centration is greater than or equal to strong solution
concentration safety shutdown limit (66%). When this
occurs the unit will perform a dilution cycle.
Recovery Condition
• Strong solution concentration is less than strong
solution concentration safety shutdown limit and the
unit switch is placed to the STOP/RESET position,
the unit becomes "READY TO START" at restart.
High Hot Water Supply Temp RT7 > %XXX.XX°F
The unit is hot water fed and the hot water temperature
less than or equal to 255°F (123°C) and the generator
conguration is for low temp, or the unit is hot water fed
and the hot water temperature is greater than or equal to
270°F (132°C) and the generator conguration is high
temp. The unit will perform a dilution cycle.
Recovery Conditions
 • Hot Water temperature is less than 254°F (123°C)
when the generator conguration is low temp and the
unit switch is placed in the STOP/RESET position.
• Hot Water temperature is less than 269°F (131°C)
when the generator conguration is high temp and the
unit switch is placed in the STOP/RESET position.
High Steam Supply Press PT2 > 35psia
(241.3kpa)
This safety shutdown occurs when the steam supply pres-
sure is greater than or equal to 35PSIA (241.3KPA), the
unit will perform a dilution cycle.
Recovery Condition
 • Steam supply pressure is greater than or equal to
31PSIA and the unit switch is placed to the STOP/RE-
SET position; unit becomes "READY TO START".
High Steam Supply Temp RT7 > XXX.XX°F
The unit is steam fed and the steam temperature ≥ 290°F
(143°C) and the generator conguration is for low temp,
or the unit is steam fed and the steam temperature is ≥
340°F (171°C) and the generator conguration is high
temp. The unit will perform a dilution cycle.
Recovery Conditions
• Steam temperature is less than 289°F (142°C) when
the generator conguration is low temp and the unit
switch is placed in the STOP/RESET position.
• Steam temperature is less than 339°F (170°C) when
the generator conguration is high temp and the unit
switch is placed in the STOP/RESET position.
Low Refrigerant Temp Analog RT8 < 33ºF
(0.56ºC)
The refrigerant temperature sensed at RT8 is less than or
equal to 33ºF (.56°C). If the chiller was in RUN status,
the chiller will close valves and stop all pumps except
the chilled water pump run contacts.