Maintenance; Cleaning The Cabinet Interior; Cleaning The Condenser; Automatic Defrost - Thermo Scientific TSG Series Installation And Operation Manual

Maintenance

Cleaning the Cabinet
Interior
WARNING: Disconnect equipment from main
power before attempting any maintenance to
equipment or its controls unless stated
otherwise.
To clean the cabinet interior, remove the shelves, use a
solution of water and a mild detergent for cleaning. Rinse the
interior storage components and wipe them dry with a soft
cloth.

Cleaning the Condenser

CAUTION: Condensers should be cleaned at
least every six months; more often if the
laboratory area is dusty. In heavy traffic areas,
condensers load with dirt more quickly. Failure to
keep the condenser clean can result in
equipment warm-up or erratic temperatures.
CAUTION: Never clean around the condensers
with your fingers. Some surfaces are sharp.
The condenser is located in the bottom front of the unit.
To clean the condenser, complete the following steps:
1. Disconnect the power.
2. Vacuum the condenser and clean up any loose dust.
3. Reconnect power.

Automatic Defrost

The defrosting process on all the models is primarily
accomplished by electrical heater.Defrost cycle works on
adaptive defrost method which is both temperature and time
controlled.
18 | Maintenance

Time based Defrost

Controller is programmed to initiate defrost for every 6 hrs and
defrost will terminate when Evaporator sensor senses
temperatures above 0 deg C.
Temperature based
Defrost
Controller is also featured with temperature based defrost in
case of heavy icing on Evaporator. Controller will initiate
defrost when the Evaporator sensor senses temperature
colder than -41 deg C. Defrost will terminate when Evaporator
sensor sees temperatures more than 0 deg C.

Gasket Maintenance

Periodically check the gaskets around the door for punctures
or tears. Leaks are indicated by condensation or frost which
form at the point of gasket failure. Make sure that the cabinet
is level.
Keep the door gaskets clean and frost free by wiping gently
with a soft cloth.
To check the door seal, complete the following steps:
1. Open the door
2. Insert a strip of paper (a couple of inches wide) between
the door gasket and the cabinet flange and close the
door.
3. Slowly pull the paper strip from the outside. You should
feel some resistance.
4. Repeat this test at 4-inch intervals around the door. If the
door does no seal properly, replace the gasket.
General Purpose Freezers