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LIGHTING –
Interior lighting is provided by incan-
descent lamps. The lamps have protective
shields which can be removed for bulb re-
placement. The lights are equipped with
switches mounted in the upper left hand cor-
ner of the door opening, that allow the lights
to come on when the door is opened. The
switches are connected in series.
FRAME HEATERS –
The cabinet is equipped with frame
heaters around each door. These are ther-
mostatically controlled and will not come on
until the cabinet is at operating temperature.
FRAME HEATER REPLACEMENT –
To replace the cabinet frame heater
wires, first remove the vinyl breaker strips
by pulling the outer edge away from the cabi-
net. Replace wires exactly as removed, pull-
ing the leads through the plastic conduit. Af-
ter connections have been made, check the
heaters for operation. Replace the plastic
breakers by reversing the removal proce-
dure.
EXPANSION VALVE ADJUSTMENT –
Expansion valve must be adjusted to
fully feed the evaporator. Before attempting
to adjust the valve make sure the evaporator
is either clean or only lightly covered with
frost, and that the cabinet is within 10º of its
expected operation temperature. Adjust the
expansion valve as follows:
1. Attach two sensing probes to the evapora-
tor, one under the clamp holding the ex-
pansion valve sensing bulb and the other
securely taped to one of the return bends
two thirds of the way through the evapo-
rator circuit. Some "hunting" of the ex-
pansion valve is normal
2. The valve should be adjusted so that dur-
ing the hunting the greatest difference
between the two probes is 3º to 5º F.
3. Remove valve stem cover and turn valve
stem counter-clockwise to decrease tem-
perature difference between the probes.
4. To increase temperature difference of
probes, turn the valve stem clockwise.
With this adjustment, during a portion of
the hunting the temperature differences
between the two probes may be less than
3º F, or at times as low as 0º F.
5. Make adjustments of no more than one
half turn of the valve stem at a time and
wait for at least fifteen minutes before
rechecking probe temperature and mak-
ing further adjustments. Replace and
tighten cover of the valve stem.
REFRIGERATION –
As stated previously, this case is a self-
contained system featuring semi-hermetic
compressor and thermostatic expansion
valve. The condenser is of a bare tube con-
struction and SHOULD BE PERIODI-
CALLY CLEANED TO MAINTAIN EFFI-
CIENT OPERATION
If it should become necessary to leak
test the system, please adhere to the following
notice:
Page 7
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