Johnson Controls YORK OPTIVIEW CONTROL CENTER, Operation Manual

Page: 103 / 142

JOHNSON CONTROLS
103
SECTION 3 - OPTIVIEW DISPLAY MESSAGES
FORM 160.10-O1
ISSUE DATE: 4/27/2018
3
ten to a location in the microboard battery backed
memory device (BRAM). This data is then read from
the BRAM and compared to the test data. If the read
data is not the same as what was written to the device,
the control center assumes the BRAM (and Real time
Clock operation) is defective and this message is dis-
played. The BRAM should be replaced by a qualified
service technician. This message automatically clears
when the BRAM problem has been solved.
Warning – Condenser Or Evaporator XDER
Error
The evaporator pressure transducer is indicating a
higher pressure than the condenser pressure transducer
after the chiller has been running for ten (10) minutes.
This is indicative of a condenser or evaporator trans-
ducer failure. This message will be displayed until the
condition clears and the WARNING RESET key is
pressed in OPERATOR (or higher) access mode. This
condition is not checked in brine mode.
Warning – Setpoint Override
A blank BRAM battery-backed memory device or a
failure of this device was detected during the initial-
ization process that occurs when power is applied to
the control center. Because of this failure, any or all of
the programmed setpoints may be corrupted. For safety
purposes, all setpoints are automatically changed to de-
fault values. All setpoints will have to be programmed
to their desired values. This message will clear when
the WARNING RESET key is pressed (Operator or
higher access mode).
Warning – Evaporator –
Low Pressure Limit
The evaporator pressure has decreased to the warning
threshold. This threshold is fixed in water cooling ap-
plications. In brine cooling applications, the threshold
is a fixed amount above the programmable safety shut-
down threshold. The safety threshold in brine applica-
tions is dependent upon the brine solution concentra-
tion and is determined by the YORK Factory. While
this condition is in effect, the pre-rotation vanes are in-
hibited from opening further. This message automati-
cally clears and the vanes are permitted to open when
the evaporator pressure increases to the reset value.
TABLE 4 - EVAPORATOR PRESSURE THRESHOLDS
WARNING THRESHOLD
(PSIA)
RESET THRESHOLD
(PSIA)
Refrig. Water Brine Water Brine
R11 5.5 0.1>Safety
Setpoint
5.6 0.3>Safety
Setpoint
R123 4.5 0.1>Safety
Setpoint
4.7 0.3>Safety
Setpoint
Warning – Condenser – High Pressure Limit
The condenser pressure has exceeded the high pressure
warning setpoint (service programmable), inhibiting
the pre-rotation vanes from opening further. This mes-
sage automatically clears and the vanes are permitted
to open when the condenser pressure decreases to 0.1
PSIA below the programmed setpoint.
Warning – Vanes Uncalibrated –
Fixed Speed
The compressor motor variable speed drive (VSD) is
operating in FIXED SPEED (full speed) mode because
the pre-rotation vanes position potentiometer calibra-
tion has not been performed.
Warning – Harmonic Filter –
Operation Inhibited
The compressor motor VSD harmonic filter has been
inhibited. Refer to the Variable Speed Drive – Service
Manual (Form 160.00-M1)
. Harmonic filter operation
should not be altered by anyone other than a qualified
service technician.
Warning – Harmonic Filter – Data Loss
Communication between the harmonic filter logic
board and the VSD logic board or the ACC board can-
not be detected. While this condition exists, all filter
related parameters are displayed as X’s. This message
automatically clears when communications are re-
stored.
Warning – Vanes Uncalibrated
The hot gas bypass feature is enabled, but the pre-
rotation vanes calibration procedure has not yet been
performed.
Warning – Harmonic Filter – Input Frequency
Range
The power line frequency detected by the VSD har-
monic filter is outside the range of 58 to 62 Hz (60 Hz),