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The Alarm and Indicator Light Descriptions table describes the conditions that trigger the alarms and indicator lights.
Alarm and Indicator Light Descriptions
Alarm/Indicator
Power Fail
Temperature High Alarm
Temperature Low Alarm
Door Open
Door Open Too Long
Refrigeration System Failure*
Defrost in Progress
Refrigeration Assist System A & B
System Operating Normally
Preventative Maintenance Reminder
Calibration Reminder
A = Audible Alarm
Note: When a refrigeration system is defrosting, the warning light on the light tower and display will illuminate. The defrosting
system cannot assist in the chamber temperature recovery during that period (approximately 15 minutes).
*When the Refrigeration System Failed alarm occurs, the affected system switches from AUTO to OFF. Refer to the
Troubleshooting section of this manual for further information on system failures.
External Access Ports
Two front access ports on the cabinet allow for usage of a building management system (BMS) or supervisory control and data
acquisition (SCADA) temperature monitoring probe. Each port is 0.875-in. (2.22 cm) in diameter and is located between the
exterior doors of the ULC Series. The access ports are plugged with rubber stoppers on the exterior and interior and are insulated
to reduce moisture infiltration. After installing a sensor in an external port, replace the insulation and seal the port both inside
and outside of the cabinet to reduce moisture infiltration.
Note: Customer BMS probe/sensor should be routed from the top of the ULC chamber, next to each refrigeration system probe.
The front ports are to be used when performing temperature mapping only.
Failure to properly seal the access port on both the interior and exterior will result in moisture infiltration, degrading the perfor-
mance of the unit. Moisture leads to ice buildup on metal surfaces, including the evaporator coil. If the moisture is uncontrolled,
the ice buildup on the coil will begin to limit refrigeration capacity (i.e., a reduced surface area for heat transfer).
System A
System B
V/C
V/C
A/V/C
A/V/C
A/V/C
A/V/C
V/C
V/C
A/V/C
A/V/C
A/V/C
A/V/C
V
V
-
-
V
V
V
V
V
V
V = Visual Alarm
Figure 4: Exterior Sensor Access Port
ULC SERIES INSTRUCTION MANUAL
Light Tower
Displays
-
-
Red
Alarm Icon
Red
Alarm Icon
Yellow
Warning Icon
Red
Alarm Icon
Red
Alarm Icon
Yellow
Warning Icon
Green
-
Green
No Alarm or Warning
Green
Service Icon
Green
Service Icon
C = Dry Contacts Switch
Settable Range
-
-80°C to 30°C
+10°C to -40°C
Instantaneous
5-300 seconds
-
-
0°C to 40°C
-
1 to 240 months
1 to 240 months
08
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