FORM 155.21-O1 (615)
57
JOHNSON CONTROLS
2
Refrigerant Pump Overload Contacts are in
conflict
This shutdown occurs when the refrigerant pump over-
load contacts open when the refrigerant pump is OFF.
If the unit is NOT running, the unit will be set in a stand
by safety shutdown condition. If the unit is running, it
will start a limited dilution cycle.
Recovery Condition
• The operator should address the problem and place
the unit switch in the STOP/RESET position.
Solution Pump Overload Contacts are in
conflict
This shutdown occurs when the solution pump overload
contacts open when the solution pump is off. The unit
will be set in a stand by safety shutdown condition.
Recovery Condition
• The operator should solve the problem, and place
the unit switch to the STOP/RESET position.
High Steam Supply Pressure PT2 > 32 psia
(220.6kpa)
The unit is not running and the valve is closed for 10
minutes steam line pressure is above 20 psia. This is an
indication that live steam may be inadvertently available
to a shutdown unit. This message resides until pressure
is below 32 psia.
Recovery Condition
• Steam line pressure is less than 20 PSIA releases
this warning but is required to press the RESET
WARNING key in SERVICE access to clear the
warning.
8SOL failure; PT3 > 100mmhg -
manually close VP2 & VP4
This message occurs when purge pump pressure at PT3
is greater than 100mmHg and the purge pump is not
running. The unit will close 7SOL and 8SOL if opened,
start the purge pump, change the purge mode to MAN-
UAL if in AUTO, and close the alarm contacts.
Recovery Condition
• Purge pump pressure is less than 100mmHg; releases
this warning but is required to press the RESET
WARNING key in OPERATOR or SERVICE access
to clear the warning.
Routine Shutdown Messages
Local Stop
A local shutdown command has been recieved as Soft
Shutdown or by placing the Keypad Start-Run-Stop/
Reset Switch in the Stop (O) position.
Remote Stop
A shutdown command has been recieved from a remote
device. Remote Stop commands can be recieved in
Digital Remote mode via I/O Board TB4-7/8 or in ISN
(Integrated Systems Network) Remote mode via the
MicroGateway serial communications. If the chiller is
running when this occurs, the steam or hot water valve is
driven fully closed prior to shutting down the chiller.
Cycling Shutdown Messages
Daily Schedule Programmed Stop
The unit will perform a dilution cycle and execute a
cycling shutdownif the unit was running when there is a
daily stop time that matches the current machine time.
Recovery Condition
• The unit is started manually by the operator or there
is a daily schedule start time that matches the current
machine time and the main switch is not in the stop
position.
Emergency Power Source Activated
The unit will perform a cycling shutdown when there is
a power failure and there is an emergency power sup-
ply. The unit will execute a limited dilution cycle and
block any other activity in the machine if the unit was
running or in a dilution cycle. The unit will stop any
manual pumps and valves operation.
Recovery Condition
• The power is recovered, the unit will restart if it
was running before the power failure or the unit
activates a safety shutdown "
RT3 LOW TEMP
AFTER POWER FAILURE - CHK CRYST
" if the
unit was not running.
