Alto-Shaam HALO HEAT 500-E/DELUXE - Manual (Page 15)

500-E installation / opEration / sErvicE manual • 13.
√ S E R V I C E • M A N U A L C O N T R O L
THERMOSTAT & INDICATOR
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 CIRCUIT DIAGRAM.
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.)
This section is provided for the assistance of qualified technicians only and is not intended for use by
untrained or unauthorized service personnel. If your Alto-Shaam ® unit is not operating properly, check the
following before calling your Authorized Alto-Shaam ® Service Agent:
* Check the power flow to the unit. Plug in outlet? Circuit breaker switch at back of unit turned on?
Do not attempt to repair or service the unit beyond this point. Contact Alto-Shaam ® for the nearest
authorized service agent. Repairs made by any other service agents without prior authorization by
Alto-Shaam
®
will void the warranty on the unit.
A. No power. Display will not light.
1. Verify that power is available at the outlet or junction box.
2. Verify that the circuit breaker switch on the back of the unit is turned on.
3. Verify that the power cord is not open. Check continuity with a VOM meter.
4. If none of the above steps help, call a qualified service technician or refer to the Service Manual for
this particular oven.
TROUBLE SHOOTING INTERNAL ELECTRICAL COMPONENTS