Johnson Controls YORK YMC2 Operation And Maintenance Manual

MBC startup messages
Table 95: MBC startup messages
Message Description
WAITING FOR FLOW
The chilled liquid or condenser flow switch input is not reading voltage
indicating no presence of flow from the flow switch. Indication of flow is
required during the MBC Startup state to allow transition to chiller run.
WAITING FOR MBC
LEVITATION
The OptiView has issued a MBC Levitate command to the MBC and is
waiting for confirmation from the MBC that De-levitated mode is OFF,
Levitated mode is ON, and the input from the digital Rotation Allowed
contacts on the MBC is high at OptiView
™
I/O board terminal TB3-30.
This message precedes “Waiting for Chilled Liquid Flow”.
WAITING FOR VSD
PREREGULATION
The OptiView has issued a VSD Pre-Charge/Pre-Regulate command
to the VSD and is waiting for confirmation from the VSD that it has
achieved regulated DC Bus voltage and is awaiting a run command.
This message precedes “Waiting for MBC Levitation”.
Start inhibit messages
Table 96: 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 VGD stroke calibration procedure has not yet been performed.
VGD FEEDBACK NOT
CALIBRATED
The VGD 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).
Warning messages
Table 97: 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 (1.6°C). 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 (4.4°C).
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.
97
YMC
2
Mod B with OptiView Control Center

Johnson Controls YORK YMC2 Specifications

General

Brand	Johnson Controls
Model	YORK YMC2
Category	Chiller
Language	English