Alto-Shaam HALO HEAT 750-GDU Manual de uso y mantenimiento - Página 5
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THERMOSTAT/INDICATOR LIGHT SEQUENCE
Whenever the dial thermostat is turned ON, the
light will indicate the power ON/OFF condition of
the heating cable; and consequently, the cycling of
the cabinet as it maintains the dialed cavity tempera-
ture. If the indicator light does not illuminate after
normal start-up, the main power source, thermostat,
and/or light must be checked. If the warming
cabinet does not hold the temperature as dialed, the
calibration of the thermostat must be checked. If the
warming cabinet fails to heat or heats continuously
with the thermostat "OFF," the thermostat must be
initially checked for proper operation. If these items
are checked and found to be in order, a continuity
and resistance check of the heating cable should be
made. SEE CIRCUIT DIAGRAM.
TION
THERMOSTAT CALIBRATION
MANUAL (DIAL) THERMOSTATS
The thermostat is precision calibrated at the
factory. Normally, no adjustment or recalibration is
necessary unless the thermostat has been mishandled
in transit, changed or abused while in service. A
thermostat with a sensing bulb operates on hydraulic
pressure; consequently, any bending of the bulb
results in a change in its volume, and alters the accu-
racy of the thermostat calibration.
A thermostat should be checked or recalibrated
by placing a quality, thermal indicator at the center
of an empty holding cavity. DO NOT CALIBRATE
WITH ANY FOOD PRODUCT IN THE
CABINET. The thermostat should be set at 140°F
(60°C), and should be allowed to stabilize at that
setting for a minimum of one hour. Following
temperature stabilization, the center of the thermal
swing of the air temperature within the cabinet
should approximately coincide with the thermostat
setting.
If calibration is necessary, the calibration screw
should be adjusted with great care. The calibration
screw of the thermostat is located in the thermostat
dial shaft. With the shaft held stationary, a minute,
clockwise motion of the calibration screw appreciably
lowers the thermostat setting. A reverse, or counter-
clockwise motion appreciably raises the thermostat
setting. After achieving the desired cycling of the
thermostat, the calibration screw must be sealed.
Place a few drops of enamel sealant directly on the
calibration screw.
(
RED NAIL POLISH OR EQUIVALENT IS ACCEPTABLE
ELECTRONIC THERMOSTATS
The electronic thermostat has been set at the factory
to indicate in degrees Fahrenheit or degrees Celsius
as requested at the time of order. The temperature
scale can be changed in the field only by an autho-
rized Alto-Shaam service agency.
The electronic thermostat is a precise instrument and
is designed to offer trouble free service. If you
suspect the temperature inside the holding compart-
ment does not match the temperature indicated on
the digital display, follow the instructions listed
below.
1. Check to make certain the unit voltage matches
CALIBRA-
2. Verify the temperature inside the holding
If the reading on the thermal indicator does not
match the digital display within 10°F (6°C), see
troubleshooting section in this manual, or contact
factory.
.)
#828 Operation & Care Manual - 4.
the power source. A power source less than that
required to operate the unit will result in inaccu-
rate temperatures.
compartment with a quality thermal indicator.
A. With the exception of the wire shelves,
completely empty the holding compartment.
B. Make certain the holding cabinet sensor,
located inside the holding compartment at
the left side of the unit, is completely clean.
C. Suspend the thermal indicator in the center
of the holding compartment.
D. Allow the temperature set on the electronic
thermostat to stabilize for a minimum of one
hour before comparing the digital display
with the reading on the thermal indicator.
Do not open the cabinet door(s) during
the temperature stabilization period.
(
INFORMATION ON ELECTRONIC THERMOSTATS
—
5)
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