Thermo Scientific Harris Ultra-Low Temperature Freezers
Installation and Operation
5
5.2 Start Up
Refer to Section 5.1 and Figure 3 on page 4 as you complete the
following procedures.
5.2.1 Turning the Power On
To start up the Harris DLT and SLT Series Freezers, complete the
following steps:
1. Plug the freezer into the power outlet (refer to Section 4.2 on
page 2).
2. Turn the key switch to the POWER ON position. The Power
On LED and the Cabinet Temperature LED illuminate.
Note:
The audible alarm function is not active at this time.
Refer to Section 5.2.3 for information about setting the
alarms. In addition, the Set Points will not be locked in
this key position.
5.2.2 Setting the Cabinet Temperature
To set the cabinet temperature, complete the following steps:
1. Press and hold the Control Set Point pad.
2. The Control set point LED lights and the Cabinet
Temperature LED goes out.
3. Press and hold
to increase the temperature or
to
decrease the temperature. The digital display scrolls through
temperature settings.
4. Release both pads when the digital temperature display
window shows the correct set point value.
Note:
If no keys are pressed within ten seconds, the
temperature display reverts to the cabinet temperature.
5.2.3 Setting the Alarms
To set the cold alarm, complete the following steps:
1. Confirm that the key switch is at the Power On position (Set
Points not locked).
2. Press and hold the Cold Alarm Set Point pad. The LED next
to this pad lights. The temperature display shows the Cold
Alarm value.
3. Press and hold
or
to adjust the Cold Alarm Set Point.
4. Release both pads when the digital temperature display
window shows the correct set point value.
To set the warm alarm, complete the following steps:
1. Confirm that the key switch is at the Power On position (Set
Points not locked).
2. Press and hold the Warm Alarm Set Point pad. The LED next
to this pad lights. The temperature display shows the Warm
Alarm value.
3. Press and hold
or
to adjust the Warm Alarm Set Point.
4. Release both pads when the digital temperature display
window shows the correct set point value.
When the cabinet temperature drops below the Warm Alarm
setting, turn the key switch to ALARM ON. The freezer is ready
to operate.
Note:
If a power failure occurs, the POWER ON light goes out.
After 30 seconds the POWER FAILURE light and the
digital temperature display flash simultaneously.
WARNING!
You must turn the three-position key
switch to the ALARM ON/SET POINTS locked
position to activate the audible alarm and place it in
security operation.
5.2.4 Alarm Reset & Status Lights (Harris DLT and SLT
Freezers)
The Silent Witness alarm reset feature ensures user
acknowledgment of the occurrence of certain alarm conditions.
This provides greater monitoring power by alerting the user if an
alarm condition has occurred during periods when the freezer
must be left unattended. The alarm conditions that activate this
feature are:
•
Temperature Failure-Warm Alarm
•
Temperature Failure-Cold Alarm
•
Voltage Low
•
Power Failure
•
Extreme Ambient Alert
During any of these alarm conditions, the corresponding
indicator will flash quickly, approximately 90 times per minute.
If the alarm condition then disappears, the flash rate will
decrease to approximately 15 times per minute. Unless the
condition reoccurs, the indicator will then continue to flash at
this rate until the Alarm Reset button is pressed. Once this has
occurred, the indicator will no longer be lit.
In the case of TEMPERATURE FAILURE-WARM ALARM and
TEMPERATURE FAILURE-COLD ALARM, if these
conditions have occurred but are now within the given limits, the
two indicators will alternately flash (180° out of phase). In
addition, for these two temperature failures, the highest
temperature and lowest temperature, respectively, during the
error condition will be saved. Before you reset after temperature
failure, you can view the temperature extreme by pressing the
Cabinet Temperature pad simultaneously with either the Warm
Alarm Set Point pad or the Cold Alarm Set Point pad.
Once the Alarm Reset button is depressed, the extreme
temperature value is reset to the current cabinet temperature.
