10
troubleshooting
The control panel has been factory tested before shipment and most issues
lie outside of the control panel e.g. proper field wiring connections to the
control panel.
In an effort to troubleshoot the system, please check the following:
• The two circuit breakers must be energized with operating handles in
the up position
• The unit requires programming in the field. See programming instruc-
tions in this manual. The ultrasonic sensor head does not require any
field programming.
• Check water make up selector switch position.
• Confirm the two sensor wires are oriented and correctly connected at
terminal points in the control panel assuring the terminal connection
does not land on the insulation of the sensor wire. Strip back just enough
wire insulation so you can see some copper wire exposed assuring a
metal-to-metal connection.
• The sensor wire is a four wire plus shielded cord. The red and black wires
connect to terminal points 24 and 13. The shield connects to ground.
Always refer to the as-built wiring diagram on the inside door panel for
current connection points. Tape back the white and green wires that are
not used.
• If sensor wires were extended in the field, check to make sure the exten-
sion wires were numbered correctly and connections secure.
•
Assure no external power wiring from other devices run in parallel with the
sensor wiring. Follow best practice wiring for power and instrumentation
wiring placements.
Checking the power circuit for the makeup solenoid
• Rotate the WATER MAKE UP selector switch to the HAND position. The
solenoid should energize allowing makeup water to flow into the cooling
loop. Inside the control panel is a single-pole circuit breaker, which must be
in the ON position to power the circuit.
