System information

27
water temperature is greater than the condenser freeze point. If
the chiller is in recycle shutdown mode when the condition oc-
curs, the controls will transition to a non-recycle shutdown.
CONTROL TEST — This feature allows the operator to
quick-test the controls and related hardware, including all unit-
controlled outputs except compressor output.
The unit must be off to run the test function. If the unit is on,
the test function cannot be accessed. The compressor can only
be started after the control test is finished (QCK_TEST =
FALSE). The test function also requires the user to enter the
User password if it has not already been entered. All control
test parameters are accessible through the QCK_TEST table.
To perform the control test function, set the first item Quick
Test Enable in the QCK_TST table to Enable.
Unless otherwise noted, all protective limits remain active
during the controls test.
Discrete Outputs
— When the control test is enabled, discrete
outputs can be enabled by setting the corresponding points to
Yes in the QCK_TST table.
NOTE: The following outputs cannot be enabled at the same
time Guide Vane Increase and Guide Vane Decrease are
enabled: HGBP Valve Open and HGBP Valve Close; Econo-
mizer Damper Valve Open and Economizer Damper Valve
Close.
NOTE: For oil pressure, a value  18 psi within 40 seconds
after the oil pump is turned on indicates a confirmation of pres-
sure (Oil Pres Test Passed=YES).
Analog Output
— When the control test is enabled, the fol-
lowing analog outputs can be enabled by entering the positions
in the QCK_TST table:
• Head Pressure Valve
• Diffuser Actuator
• Chiller Status Output (Q_CHST)
Guide Vane Calibration
— The guide vane position should be
calibrated before starting the chiller. Guide vane calibration
can be started by setting Quick Test Enable to Enable and GV1
Calibration Enable to Enable.
If the actuator type is digital (POS) 0, then:
• The fully closed guide vane feedback resistance will be
in the range of 62.5 ohms to 688 ohms (350 ± 75 ohms
target setting).
• The fully opened guide vane feedback resistance will be
in the range of 6190 ohms to 11,496 ohms (10,000 ohms
target setting).
If the actuator type is analog (1):
• The fully closed guide vane feedback mA value will be
in the range of 3 mA to 5 mA.
• The fully opened guide vane feedback mA value will be
in the range of 19 mA to 20.8 mA.
SWIFT RESTART — This function is used for data center ap-
plications. It allows the chiller to be restarted swiftly to meet
building load requirements.
To enable this function, the AUTO RESTART OPTION
point in the CONF_OPT table should be set to ENABLE.
The water flow verification time, oil prelube time and other
delays will be decreased accordingly. If the control system and
oil system are equipped with UPS (uninterrupted power sup-
ply), the start-up time will be decreased accordingly.
COOLING TOWER CONTROL — If WATER PRES-
SURE OPTION in the CONF_OPT table is set to ENABLED,
there will be another optional hydraulic control I/O board in the
PIC5 control system to allow PIC5 control for the water pumps
and cooling tower fans (high speed and low speed).
The cooling tower fans are controlled by the pressure differ-
ence between condenser and evaporator and entering water
temperature of condenser. The objective is to maintain the en-
tering condenser water temperature in the optimal range.
HEAD PRESSURE CONTROL — If the chiller system is
equipped with a head pressure control valve, and the HEAD
PRESSURE VALVE option in the CONF_OPT table is EN-
ABLED, the PIC5 control system will control the opening of
the head pressure valve to maintain the pressure difference be-
tween condenser and evaporator. The output of this valve is 4
to 20 mA type.
Before using this function, the pressure difference values for
20 mA and 4 mA should be set.
The head pressure valve should be in fully closed position
when chiller is in OFF mode.
ICE BUILD OPTION — The PIC5 controller provides an ice
build option based on efficiency improving point. The ICE
BUILD OPTION in the CONF_OPT table should be set to
ENABLED to make ice build active, and the following two pa-
rameters should be configured:
• Ice_recy (ICE BUILD RECYCLE) indicates whether
recycle option is enabled in ice build mode.
• Ice_term (ICE BUILD TERMIN SOURCE) indicates
how the ice build is terminated. There are three types:
temperature (0), dry contact (1), or combined tempera-
ture and dry contact (2).
TIME SCHEDULE — The PIC 5 control provides three
schedules:
• Local schedule - OCCPC01S
• Ice build schedule - OCCPC02S
• Network schedule - OCCPC03S
Each schedule has 8 time segments. If two time segments
overlap, the unoccupied time segment takes priority.
There are 16 holiday time segments. Each holiday time seg-
ment is determined by three parameters—month, start date,
and holiday days. The controller will be in unoccupied mode
when a holiday time segment is active.
BLACK BOX — The black box task continuously stores
operation parameters in memory every 5 seconds. Up to 20
collects can be stored before a chiller operation alarm event to
avoid filling the buffer unnecessarily. Each collect contains up
to 180 records (15 minutes), with 168 records (14 minutes)
before the alarm event and 12 records (1 minute) after the
event. The black box task uses the “rotary” rule to fill the
records in the buffer (first in first out). Each record is associ-
ated with a time in hour, minute, and second. When 12 records
have been collected after the process alarm event, the black
box task stops the collect, transfers the information into a .csv
file, and starts to fill another event record. The RAM memory
writing is never stopped, so if another alarm event occurs there
is no data loss. (If power is lost, only the .csv files remain. Data
in RAM memory is lost.)
The black box file can be uploaded with the Carrier S-Ser-
vice tool. Once the upload is done, the data collect erase flag
will be sent from the Carrier S-Service and the collect buffer
will be erased.
PRESSURE TRANSDUCER CALIBRATION — The HMI
pressure readings are displayed in the Main Menu  Pressures
screen. See Fig. 36 and 37.