4
Sensor of Mechanical
Thermostat not in good thermal
contact with evaporator at
designed location.
The free end of the Mechanical Thermostat sensor must be in
good thermal contact with the evaporator at the point where
the black plastic clamp is situated. Not attaching the sensor,
or attaching at somewhere other than the designed location
will result in undesirable box temperatures.
5
Poor spillover system
construction
If you are running the evaporator as a freezer and cooling an
adjoining refrigerator compartment with spillover air, there
must be an adequate thermal barrier between the two. It also
must be completely sealed down the sides and along the
bottom to prevent unwanted air-flow. Temperatures in the
refrigerator side should be controlled either with trial-and-
error convection holes, or a thermostatically controlled fan,
(Spillover Fan/Thermostat Kit, PN E26200). Two apertures
are necessary, one high and one mid-height for adequate air
circulation.
11:5
Excessive frost build-up
Note
This is the result of moist air being allowed to enter the box. Problems are compounded when
cold, dense air leaks from the lower area of the box through an open drain or weak door seal
and is replaced by warm, humid air being drawn in elsewhere.
Probable cause
Action
1
Drains and holes not plugged
Make sure all drains and holes in the floor and walls of the
box are sealed.
2
Circulating fan
If a small fan is used to circulate air in the box, make sure
that it is not too powerful, and that cold air is not escaping
from a door/lid seal. This could force cold air out of the
refrigerator box, and the freezer then has to draw air in from
a weak seal to replace it.
3
Poor or damaged door/lid seals
Check seals and replace if necessary. A good seal will grip a
$1 bill when inserted between the seal and door/lid when
closed. A front opening door/top opening lid combination
with poor seals is likely to result in excessive frost build-up
on the evaporator and cause extended run times. To
determine leaking seals, apply masking tape to suspect areas
after defrosting, and then check after several days for frost
build-up.
