Clean Door Gasket; Vacuum Relief Port - Thermo Scientific Revco ExF-86C Operating Manual

Section 4 Section 4
Maintenance Maintenance
Long Term Storage with
W-c Condenser (cont.)

Clean Door Gasket

Vacuum Relief Port

4-4 Revco ExF
Note Do not use liquids corrosive to stainless steel or the brazing material
(copper or nickel). Do not use hydrochloric acid or muriatic acid.
1. Turn the freezer off.
2. Drain and clean the unit following the procedure in this section, Clean
Water-cooled Condenser.
3. The condenser must be fully dry prior to storage. Use dry air to purge
and dry the condenser circuit as much as possible. Since the freezer is
not running, the internal valve will be closed and dry air cannot be
circulated through the loop. Allow the condenser to dry, open to the
air, until no moisture is seen at the connecting ports.
4. After the condenser water loop is dry, purge both the inlet and outlet
with nitrogen or dry air and cap the ports.
Note On restarting a freezer that has been stored for some time, it is
suggested to run the unit briefly, then check and clean the particulate
filter, if fitted, to ensure that no sediment or growth occurred in the
condenser during storage.
The door gasket should be cleaned monthly, minimum. Using a soft cloth,
remove any frost build-up from the gasket and door(s). The door gasket
may need to be cleaned more frequently if dirt or excessive frost build-up
prevents the door from closing properly.
The exterior door gasket provides an excellent seal to protect product,
provide an energy efficient thermal barrier to keep cold air in and room
temperature air out, and reduce frost build up on the inner doors.
Because the door gasket seals so well, a vacuum can be created after a door
opening. Warm air enters the cabinet, cools and contracts, creating a
vacuum that pulls the door in tightly against the seal.
To equalize the pressure inside the cabinet after a door opening requires
1.5-3.0 cu.ft. of ambient air to be drawn into the cabinet. The amount of
air required to equalize the pressure varies depending on the cabinet size,
cabinet temperature, duration of door opening, inventory volume and the
temperature/humidity of the ambient air. The unit is designed with a
"vacuum relief port" that allows the pressure to be equalized.
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