York YMC2 User Manual

JOHNSON CONTROLS
90
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
TABLE 8 - START INHIBIT MESSAGES
MESSAGE DESCRIPTION
LINE FREQUENCY NOT SET
This start inhibit is set when the Line Frequency setpoint is “INVALID”. Line Frequency
is set invalid on a new or cleared BRAM until programmed.
LINE VOLTAGE NOT SET
This start inhibit is set when the Line Voltage setpoint is “INVALID”. Line Voltage is set
invalid on a new or cleared BRAM until programmed.
VGD STROKE NOT CALIBRATED The Variable Geometry Diffuser stroke calibration procedure has NOT yet been performed.
VGD FEEDBACK NOT
CALIBRATED
The Variable Geometry Diffuser feedback calibration has not yet been performed since
last stroke calibration.
MBC - INITIALIZATION
FAILURE
OptiView was unable to read a valid validation key code over serial communications
from the MBC after prompted by voltage present on the MBC Alive contacts (I/O board
TB3-71).
TABLE 9 - WARNING MESSAGES
MESSAGE DESCRIPTION
WARNING - CONDENSER
FREEZE THREAT FROM LOW
PRESSURE
While the chiller state is Stopped, the Saturated Condenser Temperature decreased
below 35.0 °F. The condenser pump run contacts close. The message is automatically
reset and pump contacts return to prior state when either the chiller is not in stopped
state or the Saturated Condenser Temperature is > 40.0 °F.
WARNING – CONDENSER –
HIGH PRESSURE LIMIT
The Condenser Pressure exceeds the High Pressure Warning Setpoint threshold,
programmed by a Service technician logged in at SERVICE access level. While this
condition is in effect, the chiller capacity is in override to reduce pressure. This message
automatically clears and normal LCHLT capacity control restored when the Condenser
pressure decreases to below the Setpoint.
WARNING – CONDENSER OR
EVAPORATOR XDCR ERROR
The Evaporator pressure Transducer is indicating a higher pressure than the Condenser
pressure Transducer after the chiller has been running for 10 minutes. This is indicative
of a Condenser or Evaporator Transducer failure. This message will be displayed until
the condition clears and the WARNING RESET Keypad key is pressed in OPERATOR
(or higher) access mode. Condition not checked in Brine mode.
WARNING – CONDENSER OR
VGD SENSOR FAILURE
The difference between the Discharge Pressure Transducer output and the Condenser
Pressure Transducer output has exceeded 21 PSID for 3 continuous minutes while the
chiller was running. This feature veries the operation of the transducers. Since both
transducers are measuring essentially the same pressure, both outputs should be within
the specied tolerance. This message must be manually cleared. It will be displayed un-
til the transducer outputs are within the acceptable range of each other and the WARN-
ING RESET key in SERVICE access level.
WARNING – EVAPORATOR –
LOW PRESSURE LIMIT
The Evaporator pressure has decreased to the Warning threshold. This threshold is
xed in Water cooling applications. In Brine cooling applications, the threshold is a xed
amount above the programmable safety shutdown threshold. The Safety threshold in
Brine applications is determined by the Brine solution and is determined by the YORK
Factory. While this condition is in effect, the chiller capacity control is in override to in-
crease suction pressure. This message automatically clears and normal LCHLT capacity
control restored when the Evaporator pressure increases to the reset value.
EVAPORATOR PRESSURE THRESHOLDS
Warning Threshold (PSIG) Reset Threshold (PSIG)
Water Brine Water Brine
27.0 +2.0>Safety Setpoint 28.0 +3.0>Safety Setpoint
WARNING – EXCESS SURGE
DETECTED
(Applies only if Surge Protection SHUTDOWN feature is Disabled) The Surge Window
Count has exceeded the Count Limit. Message can be manually cleared after the Surge
Window Count is less than or equal to the Count Limit, or the SHUTDOWN feature is
Enabled or the chiller is stopped. To clear message press WARNING RESET key on
HOME Screen when logged in at OPERATOR (or higher) access level.
WARNING - LIQUID LEVEL
SETPOINT NOT ACHIEVED
The chiller is running and Refrigerant Level > (Refrigerant Level setpoint +15%) OR
Refrigerant Level < (Refrigerant Level setpoint -15%) for 10 continuous minutes. The
Warning is bypassed for the rst 30 minutes of run to allow stabile operation to estab-
lish. It is released when the chiller is not running or Refrigerant Level is within setpoint
+- 15%. The message clears automatically.

York YMC2 Specifications

General

Brand	York
Model	YMC2
Category	Chiller
Language	English