Thermo Scientific Revco Cryogenic Storage Freezers
Installation and Operation
4
6.2 Start Up
Refer to Section 6.1 and Figure 2 on page 3 as you complete the
following procedures.
6.2.1 Turning the Power On
To start up your cryogenic freezer, 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 alarm function is not active at this time. Refer to
Section 5.2.3 for information about setting the alarms. In
addition, the Setpoint Security will be deactivated in this
key position.
3. The unit will start about 30 seconds later.
6.2.2 Setting the Cabinet Temperature
To set the cabinet temperature, complete the following steps:
1. Press and hold the Control Setpoint pad.
2. The Control setpoint 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 setpoint value.
Note:
If no keys are pressed within ten seconds, the
temperature display reverts to the cabinet temperature.
6.2.3 Setting the Alarms
To set the cold alarm, complete the following steps:
1. Confirm that the key switch is at the Power On position
(Setpoint Security disabled)
2. Press and hold the Cold Alarm Setpoint 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 Setpoint.
4. Release both pads when the digital temperature display
window shows the correct setpoint value.
To set the warm alarm, complete the following steps:
1. Confirm that the key switch is at the Power On position
(Setpoint Security disabled).
2. Press and hold the Warm Alarm Setpoint 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 Setpoint.
4. Release both pads when the digital temperature display
window shows the correct setpoint 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 lasting over 30 seconds occurs, the
POWER ON light goes out and the POWER FAILURE
light and digital temperature display flash
simultaneously.
WARNING!
You must turn the three-position key
switch to the ALARM ON/SETPOINT SECURITY
position to activate the alarm and place it in security
operation.
6.2.4 Alarm Reset & Status Lights
The 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 incorporating this feature are:
•
Temperature Failure-Warm Alarm
•
Temperature Failure-Cold Alarm
•
Voltage Low
•
Power Failure
•
Life-Guard Alert
•
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. The indicator
will then remain flashing at this rate, unless the condition
reoccurs, 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 temperatures failures, the highest
temperature and lowest temperature, respectively, during the
error condition will be saved. Prior to the temperature failure
being reset, the temperature extreme may be viewed by pressing
the Cabinet Temperature pad in conjunction with either the
Warm Alarm Setpoint pad or the Cold Alarm Setpoint pad.
Note:
Once the Alarm Reset button is depressed, the extreme
temperature value is reset to the current cabinet
temperature.
6.2.5 Alarm Test
To test the cold and warm alarms, complete the following steps:
1. Press and hold the Alarm Test pad. The digital temperature
display indicates rising temperature. When the temperature
reaches the warm alarm value, the alarm sounds.
Note:
The temperature of the refrigerated space does not
change during this procedure. Only the sensor is heated.
2. Release the Alarm Test pad, the sensor and display return to
cabinet temperature in a few minutes.
