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There is also and adjustable tempera-
ture differential (the difference between the cut-
in temperature and the cut-out temperature)
located on the back of the temperature control
cover. When adjusting the differential, the tem-
perature setting may also have to be adjusted.
See figure below for internal adjustment loca-
tions.
The control has a range of –20º F to
+220º F with a differential of 1º to 30º. It is fac-
tory set for approximately 29ºF with a 10º dif-
ferential. The temperature should be checked
with a thermometer other than the case ther-
mometer after it is running to insure that the
case is running at the proper temperature for
the product.
A picture of A319 Electronic Tempera-
ture Control and Board Layout is located on
the last page of this booklet.
Thermometer –
The thermometer is located by looking
through the right hand door onto the right
hand end of the fan plenum.
The thermometer will also warm up
rather rapidly when the case door is held open
for a time such as when the case is being re-
stocked or a shopper is making a decision on a
product. After the door is closed it will take
some time for the thermometer to pull back
down to the case temperature. The thermome-
ter and temperature control sense discharge air
temperature which is 5-10º colder than the case
temperature.
The thermometer may be replaced by
removing the two screws securing it to the
evaporator fan grill. Lower the evaporator coil
cover by removing the brass thumb screws
located at each end of the cover, and backing
out the thumb screws located along the front
edge of the cover.
Follow the sensing lead from the ther-
mometer until you locate the sensing element.
Loosen the clamp securing the element and re-
move the element. Remove the thermometer.
Assemble is the reverse order making sure you
first thread the element through the hole in the
evaporator fan grill. Cleaning of the sensing
element may also be accomplished in this man-
ner.
Electrical Enclosure –
For servicing convenience, access is
gained by removing the access panel and elec-
trical box cover. The cabinet supply breakers
should be disconnected before removing the en-
closure cover.
Lighting –
Electronically powered T-8 lamps lo-
cated inside each doorway provide interior
lighting. The tubes are enclosed in a patented
lens system to maintain proper heat around the
bulb for maximum light intensity and to protect
the product in case of breakage. See the
Commercial instructions for the lens removal,
attached at the back of this booklet.
Each HGM model has a convenient ON/
OFF switch so lights may be turned off to con-
serve energy during hours when the store is
closed. The switch is located inside the cabinet
above the left hand door. This switch only con-
trols the lights. 115 volt power must be shut off
at the main power supply source located within
the store prior to starting any service or main-
tenance work.
Page 6
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