U-Line 1224R User Manual page 43

USER GUIDE
SAFETY • INSTALLATION & INTEGRATION • OPERATING INSTRUCTIONS • MAINTENANCE •
Check Voltage
No Voltage
At Wall Outlet
Voltage
Verify Voltage At
No Voltage
Main Control
Voltage Input
Voltage
Check Fuse F1
No Continuity
For Continuity
Continuity
Connect Test Display
Cycle Power And Check
For Operation
Not Operating
Is the Reed
Switch Operating
Properly?
No
Replace
Reed Switch
Testing The Main Control
If the main control is suspected of being faulty, the
following procedure should be performed to verify main
control for functionality.
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.
Alert Customer
Of Power Failure
Replace
Power Cord
Replace
Fuse
Inspect
Operating
Customer UI
and Data Cable
Replace Main
Yes
Board
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, test component.
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.
THERMISTORS
Thermistors are used for various temperature readings.
Thermistors provide reliable temperature readings using a
resistance which varies based on surrounding
temperatures. If a faulty thermistor is suspected it may
be tested using an accurate ohmmeter. In an ice water
bath (32°F) resistance should measure 16.1 kilohms.
5K OHMS @ 77°
16.1K OHMS - 32°F ambient
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Troubleshooting - Extended 3