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Model 700 Series -40C________________________________________________________________________Maintenance
4.5 Cleaning Door Gasket (minimum monthly)
Using a soft cloth, remove any frost build-up from the gas-
ket 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.
4.6 Cleaning Vacuum Relief Port (minimum monthly)
The exterior door gasket provides an excellent seal that pro-
tects product, provides an energy efficient thermal barrier to
keep cold air in and room temperature air out and reduces frost
build up on the inner doors.
Because the door gasket seals so well, a vacuum can be cre-
ated 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, dura-
tion 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 equal-
ized.
The time required to draw 1.5-3.0 cu.ft. of air into the cabi-
net depends on two factors,
a) the size and number of paths available for the air to
enter the cabinet, and
b)
the pressure difference between the internal cabinet
and the ambient room.
Cabinets with the vacuum relief port operating normally,
(i.e. vacuum relief port is not iced over) will require a minimum
of 30 seconds up to a maximim of 120 seconds for the cabinet to
equalize. This is also a good indication that the exterior door is
well sealed.
The vacuum relief port requires routine maintenance. It will
ice over unless preventive measures are taken. If the vacuum
relief port becomes iced over, the freezer will take several hours
to equalize pressure.
To open the door if a vacuum lock occurs:
1. Unlatch the handle of the freezer (Figure 4-1).
2. On the HINGED side of freezer (Figure 4-2), slide part
number 402058 tool or a non-metallic flat object such as
a ruler, tongue depresser or plastic putty knife carefully
between the door gasket and door until only the end of
the tool handle is showing (Figure 4-3). There will be a
noticeable sound of air exchange that could last a few
minutes.
3. As the air pressure equalizes, the door releases.
Do not leave the freezer unattended while the
door is unlatched. The vacuum could release
resulting in a door opening and product loss.
Vacuum Relief
Mechanism
Figure 4-3
4 - 2
Figure 4-1
Flat
Tool
Figure 4-2
Hinge
side
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