Helmer Scientific i.Series
®
and Horizon Series
™
Freezer - Undercounter
Service and Maintenance Manual
360417/A
59
11.1 Alarm Tests
Test alarms to ensure they are working correctly. The freezer has alarms for chamber temperature, power failure, and
door open (time).
Chamber Temperature Alarm Test
NOTICE
• Perform the low alarm test before the high alarm test to control the temperature more closely and complete the testing
more quickly.
• Before testing alarms, protect items stored in the unit from extended exposure to adverse temperature.
• Temperature probes are fragile; handle with care.
Test the High Alarm:
1. Identify the setting for high alarm setpoint.
2. Place the glass of product simulation solution in the freezer.
3. When the product simulation solution has stabilized at the chamber temperature, remove the solution from the freezer.
4. Remove the monitor probe from the probe bottle and insert into the product simulation solution.
5. Observe the temperature on the monitoring system display at which the high temperature alarm sounds.
6. Compare the temperature at which the alarm sounds to the high alarm setpoint.
7. Remove the probe from the product simulation solution.
8. Place the monitor probe in the probe bottle, immersing it at least 2” (50 mm).
Power Failure Alarm Test
Note
During a power failure, the back-up battery should continue to provide power to the monitoring system.
1.
Switch the AC power switch OFF. The audible power failure alarm will activate by displaying “PoFF” (power off) and an
audible tone can be heard approximately every 30 seconds.
2. Switch the AC power switch ON. The audible power failure alarm will cease and “PoFF” will clear from the display.
Door Open Alarm Test
Note
The Door Open alarm is factory-set to three minutes and cannot be changed.
1. Open the freezer door and note the time.
2.
After three minutes, the audible alarm will activate and the DOOR ALARM lamp will flash.
3.
Close the freezer door. The audible door open alarm will cease and the DOOR ALARM lamp will stop flashing.
Horizon Series
