SAFETY • INSTALLATION & INTEGRATION • OPERATING INSTRUCTIONS • MAINTENANCE •
SERVICE
Troubleshooting - Extended 4
USER GUIDE
u-line.com
Relay & DC Outputs
One of the primary functions of the main control is to
operate the multiple relay and DC outputs during
each cycle. Verify proper operation of these relays
using the following procedure.
1.
Enter “Relay Toggle” through the service menu.
NOTICE
Frequently toggling the compressor relay could
force the compressor into overload. The
compressor will automatically deactivate during
an overload and will remain deactivated until the
overload switch cools. This could take some time.
It is important to allow the compressor at least 5
minutes off time between relay cycles.
2.
Toggle the relay. Its related component should
activate / deactivate with the switching of the
relay. If it does not, see “Component Testing.”
Inputs
The main control monitors a number of thermistor
inputs and switch states during operation. It would be
unlikely that an error in reading an input would be at
the board level. Always attempt to replace the faulty
switch or thermistor input with a known working
sample to verify proper board operation.
Other Suspected Main Control Faults
If other components have been ruled out as being
faulty but the unit continues to have operating issues,
it is most likely due to a configuration error.
Configuration errors can be cleared by restoring the
unit to its factory default setting. Factory defaults
may be restored through the service menu.
CAUTION
Precautions must be taken while working with
live electrical equipment. Be sure to follow
proper safety procedures while performing tests
on live systems.
CONVECTION COOLING
All 3000 series units are equipped with an advanced
convection cooling system. Convection cooling
stabilizes cabinet temperature, cools product faster
and increases energy efficiency.
Evaporator Fan
The evaporator fan is responsible for circulating warm
air from the refrigeration zone, past the evaporator and
back into the refrigerated zone.
The evaporator fan is factory set to have a 1 minute
delay at the beginning of a cooling cycle. This delay
gives the evaporator time to cool properly before warm
air is passed over it. The fan will continue to run for an
additional 2 minutes at the end of a cooling cycle. Fan
delay times can be modified through the service menu.
Evaporator fan operation is also determined by door
switch state. If the door switch circuit opens the fan
will stop. When the door switch circuit is closed the
fan will either continue running with the cooling cycle,
or if not currently cooling, the fan will run for 1
minute to circulate air and clear any condensation
that may have appeared on glass doors and shelves.
NOTE: If the unit is set to sabbath mode the
evaporator fan will no longer respond to the state of
the door switch.
In order to operate efficiently the evaporator fan
blade and vents should be unobstructed and free of
any dust buildup.
Summary of Contents for U-3018RINT-00A
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