York OPTIVIEW - Shutdown Messages; Routine Shutdown Messages; Cycling Shutdown Messages

JOHNSON CONTROLS
118
FORM 160.78-O2
ISSUE DATE: 5/22/2017
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
TABLE 7 - ROUTINE SHUTDOWN MESSAGES
MESSAGE DESCRIPTION
LOCAL STOP A local shutdown command has been received by pressing the Keypad Stop key.
REMOTE STOP
A shutdown command has been received from a remote device. Remote Stop com-
mands can be received in Digital Remote mode via I/O Board TB4-7/8 or in BAS (ISN)
(Integrated Systems Network) Remote mode via the E-Link Gateway serial communica-
tions. If the chiller is running when this occurs, the chiller performs a soft shutdown.
TABLE 8 - CYCLING SHUTDOWN MESSAGES
The chiller will automatically restart when the cycling
condition clears. Service and troubleshooting informa-
tion is contained in the YORK YMC
2
Service Manual
MESSAGE DESCRIPTION
CHILLED LIQUID – FLOW
SWITCH OPEN
The Chilled Liquid Flow Switch has remained open for 5 continuous seconds while the
chiller was running, in soft shutdown, or at least 45 seconds after MBC startup is initi-
ated. The chiller will automatically restart when the ow switch closes.
CONDENSER – FLOW SWITCH
OPEN
The Condenser water ow switch has remained open for 5 continuous seconds while
the chiller was running or in soft shutdown. This check is bypassed until “System Run” is
achieved. The chiller will automatically restart when the ow switch closes.
CONTROL PANEL – LOSS OF
CONTROL VOLTAGE
The control power input signal at I/O board TB3-81 was low for 1 second continuous.
This signal is used to determine when the digital inputs are affected by a panel power
loss versus an actual condition for their devices. This fault is not expected on an actual
loss of microboard power, because the processor will be off before the fault delay.
CONTROL PANEL – POWER
FAILURE
A Control Power failure has occurred. If the power failure occurred while the chiller was
running, it will automatically restart when power is restored. This message can indicate
a Cycling (auto-restart after power failure) or Safety (manual restart after power failure)
shutdown, depending upon control center conguration. It indicates a cycling shutdown
when displayed in orange characters; Safety shutdown when displayed in red char-
acters. The control center is congured for auto-restart or manual restart after power
failure by a qualied Service Technician following instructions in YORK YMC
2
Service
Manual (Form 160.78-M2).
CONTROL PANEL – SCHEDULE
The programmed Daily Schedule Setpoint has shutdown the chiller. If this occurs while
the chiller is running, a Soft Shutdown is performed. The chiller will automatically restart
at the next scheduled start time.
EVAPORATOR – LOW
PRESSURE
The evaporator pressure, as sensed by the Evaporator Transducer, has decreased to
the shutdown threshold. For water cooling applications, the shutdown threshold is a
xed value. For Brine cooling applications, the shutdown threshold varies according to
the concentration of the Brine solution. The Brine shutdown threshold is programmed at
the YORK Factory. It should not be changed by anyone other than a qualied Service
Technician following instructions in YORK YMC
2
Service Manual (Form 160.78-M2). The
chiller will restart after the evaporator pressure increases to the restart threshold. If this
shutdown occurs 3 times in a 90 minute period, an EVAPORATOR-LOW PRESSURE
safety shutdown is initiated.
SHUTDOWN
SHUTDOWN
(PSIG)
RESTART
(PSIG)
Water Cooling
-R134a
25.0 25.1
Brine Cooling
-R134a
6.0 to 25.0
as programmed
+0.1>
Shutdown threshold
(Form 160.78-M2) and YMC
2
Variable Speed Drive
Service (Form 160.78-M3).