Alto-Shaam 500-PH/GD Manuale - Pagina 13

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THERMOSTAT & INDICATOR LIGHT SEQUENCE

THERMOSTAT & PILOT LIGHT SEQUENCE

Whenever the thermostat is turned "ON," the

indicator 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 temperature. If this light does not illuminate

after normal start-up, the main power source,

thermostat, and/or indicator 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 WIRE DIAGRAM INCLUDED WITH THE

UNIT.

S E R V I C E

500-PH/GD (Rev . 1) • Installation/Operation/Service Manual • 11

THERMOSTAT CALIBRATION

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 accuracy 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, and should be allowed to

stabilize at that setting for a minimum of one hour.

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.)