Operation; System Status Lights; Maintenance And Troubleshooting; Cleaning The Condenser - Thermo Scientific PLUS Series Installation And Operation Manual

Thermo Scientific Revco

10.4 Operation

When the backup system is in operation, you can view and reset
parameters in Program Mode (refer to Section 8.7 on page 7).
The backup system can run for a minimum of eight hours on
battery power.

10.5 System Status Lights

The built-in backup system includes main control panel system
status lights, which appear to the right of the main temperature
display as shown in Figure 1 on page 4.
The Supply On Indicator lights when the backup system is
•
operating on battery power and the system is actively
injecting CO or LN .
2 2
The Backup System Battery Low Indicator lights when the
•
backup system battery charge is low. The built-in battery
charger recharges the battery to full charge when power is
restored to the system. Pressing Battery Low displays the
battery charge in tenths of a volt, then returns to the main
display after about one second.
Since rechargeable batteries degrade over time, the
Note:
battery should be replaced after approximately three
years or after an event which has required the injection
of CO2 or LN2.
The Backup System Empty Indicator lights when the standby
•
CO or LN bottle is empty.
2 2

11 Maintenance and Troubleshooting

Unauthorized repair of your freezer will invalidate your
warranty. Contact Technical Service at 1-800-438-4851 for
additional information.
CAUTION!
Maintenance should only be performed
by trained personnel.

11.1 Cleaning the Condenser

Clean the condenser at least every six months; more often if the
laboratory area is extremely dust prone.
To clean the condenser, complete the following steps:
1. Pull the grill open.
2. Remove the filter. Check the fans. If a fan is not operating,
contact an authorized service company immediately.
3. Vacuum the condenser.
4. Replace the filter and close the grill.
Upright Freezers
PLUS

11.2 Cleaning the Condenser Filter

Clean the condenser filter every two or three months.
1. Pull the grill open.
2. Remove the filter.
3. Shake the filter to remove loose dust, rinse the filter in clean
water, shake the excess water from the filter, and replace the
filter.
4. Close the grill.

11.3 Gasket Maintenance

Periodically check the gaskets around the door for punctures or
tears. Leaks are indicated by a streak of frost which forms at the
point of gasket failure. Make sure that the cabinet is level (refer
to Section 6.3 on page 2 for leveling information).
Keep the door gaskets clean and frost free by wiping gently with
a soft cloth.

11.4 Defrosting the Freezer

Defrost the freezer once or year or whenever the ice buildup
exceeds 3/8".
To defrost, complete the following steps:
1. Remove all products and place in another cabinet.
2. Turn off the freezer.
3. Open the outer door and all inner doors.
4. Let the freezer stand with doors open for at least 24 hours.
This allows both the interior and foamed refrigerant system
to warm to room temperature.
5. Dispose of the ice and wipe out any water standing in the
bottom of the cabinet.
6. If there is freezer odor, wash the interior with a solution of
baking soda and warm water. Clean the exterior with any
common household cleaning wax.
7. Close the doors, restart the freezer and reload, following the
instructions in Section 4.1 on page 2.

11.5 Alarm Battery Maintenance

Have a certified technician replace the alarm battery after each
use, and check the condition of the battery at least once a year.

11.6 Troubleshooting Procedures

Table 2. Troubleshooting Procedures
Problem
Clean Filter
Condenser filter is dirty. Refer to Section 11.2.
indicator is on.
Alarm battery is low on charge. Have a
Alarm Battery Low
technician check the alarm battery. Refer to
indicator is on.
Section 11.5.
Installation and Operation
Solution
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