Defrost Time Clock; Defrost Heater Thermostat; Defrost Heater Replacement - Hussmann HGL-1BS Installation And Service Instructions Manual

THE CABINET SUPPLY BREAKERS
SHOULD BE DISCONNECTED BE-
FORE REMOVING THE ENCLOSURE
COVER.
DEFROST TIME CLOCK –
The timer is factory pre-set for two
defrost cycles per day at 6:00 a.m. and
10:00 p.m. with a 40 minute failsafe. The
timer must be adjusted to the proper time
of day when the cabinet is started. The
timer is adjusted by turning the knurled
adjustment knob in the center of the dial
face counter-clockwise until the time indi-
cator corresponds with the correct time of
day. The defrost pins should be checked
for tightness. The timer will require re-
adjusting after a power failure or the
cabinet supply is turned off for extended
periods of time. If an additional defrost is
required due to ambient or cabinet usage
conditions, do not put a defrost during the
middle of the day. Put any additional de-
frost during the night or a time when the
cabinet has the lowest usage.
Defrost is time initiated and tem-
perature terminated. If cases are multi-
plexed, the defrost thermostats can be
wired in series so that the cases can be
temperature terminated.
If the thermostat should fail, the
timer is equipped with a failsafe set at 40
minutes that will allow defrost to termi-
nate on time.
DEFROST HEATER THERMOSTAT –
The defrost heater thermostat is
clamped to the evaporator outlet tube. It
is a bi-metal thermostat that is tied in se-
ries with the evaporator fans for a delay
and with defrost time clock solenoid to end
defrost when the temperature has been
satisfied. The evaporator fans will not
come on until the thermostat senses 32ºF
and defrost will terminated when the stat
senses 58ºF.

DEFROST HEATER REPLACEMENT

The defrost heaters are firmly em-
bedded in the evaporator and held in place
with spring clips. To remove the heater,
first remove all the spring clips and pull
the defective heater out of the slots in the
evaporator, starting at the wire supply
lead.
The replacement heater should be
firmly seated in the slots by using a small
block of wood and a mallet. After the new
heater is in place, replace all of the spring
retaining clips to assure heater retention.
One lead of the defective heater may be
used to pull the new leads through the
cabinet to the respective terminals as
marked on each lead.
NOTE: Care must be taken to make sure
the drain stub is correctly inserted in the
cabinet drain tube for proper drainage.
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