Product manual

IOMM ACR/AGR-1 53
Alarms
Circuit Alarm Conditions
The “Circuit Alarm Conditions” are those alarms that only affect one circuit and can stop the
compressors of that circuit. These alarms are:
• Compressor Motor Protection
• High Condenser Pressure
• Freezestat Protection
The Alarm Light on the control panel will illuminate if either circuit has a high head pressure
occurrence or a compressor motor protection occurrence. Freeze protection would be indicated on the
optional Zone Terminal. If a circuit is off and the panel alarm light is not on, try depressing the
Freezestat reset on the control panel. There is a five minute time delay after depressing the reset
button.
The chiller must have the manual reset system alarm conditions cleared before normal operation can
resume. If the alarm that occurred is an auto-clearing alarm, once the condition has corrected, the
chiller will resume normal operation provided the anti-cycle timers have cleared and sufficient load
exists.
System Alarm Conditions
The “System Alarm Conditions” are those alarms that are common to both refrigeration circuits and
require all compressors to be temporarily shut off or locked out, whichever applies.
System alarm conditions are:
• Loss of Water Flow
• Phase Voltage Monitor PVM (Optional)
• Ground Fault Protection GFP (Optional)
The Alarm Light on the control panel will illuminate if either the PVM or GFP has a fault occurrence.
Loss of water flow is indicated on the optional Zone Terminal.
The chiller must have the manual reset system alarm conditions cleared before normal operation can
resume. If the alarm that occurred is an auto-clearing alarm, once the condition has corrected, the
chiller will resume normal operation provided the anti-cycle timers have cleared and sufficient load
exists.
ZONE TERMINAL (optional)
The Zone Terminal (ZT) is a hand-held or unit mounted device that monitors and adjusts your
McQuay Global Reciprocating Chiller information.
A standard telephone-style jack directly connects the ZT to the McQuay Global UNT controller.
Features
• Portability
• Simultaneous monitoring of three different settings or values
• Easy operation with only seven buttons
• Flashing numbers to show which items are ZT adjustable
• Flashing symbols to notify you of alarm conditions
Capabilities
With the ZT, you can:
• Quickly identify a chiller alarm and its location
• Monitor and adjust up to 18 different settings