Troubleshooting - Randell DIPPING CABINET SERIES Operator's Manual

TROUBLESHOOTING

This unit is designed to operate smoothly and efficiently if properly maintained.
However, the following is a list of checks to make in the event of a problem. Wir-
ing diagrams are found at the end of this manual. When in doubt, turn unit off
and contact service at 888-994-7636 or tsrandell@unifiedbrands.net.
SYMPTOM POSSIBLE CAUSE
No power to unit
Control in OFF position
Unit does not run
Faulty control
Unit too cold Incorrect set point
Door / drawer ajar
Gasket torn or out of place
Unit too warm
Incorrect set point
Warm product introduced
to cabinet
Ice on the coil
Unit noisy Ice on the coil
Unit does not defrost Excessive ice on the coil
DANFOSS CONTROLLER CODES
DISPLAYED ALARM
ALARM CODE
Hi High Temperature Alarm
Lo Low Temperature Alarm
Condenser Temperature
CON
High Limit
uHi Line Voltage Too High
uLi Line Voltage Too Low
Continuous Compressor
LEA
Runtime
E01 S1 Sensor Failure
E02 S2 Sensor Failure
E03 S3 Sensor Failure
E04 S4 Sensor Failure
4 OM-ICE CREAM DIPPING CABINET
SERVICE
PROCEDURE
Plug in unit
This piece of equipment uses a R290 Refrigeration system. This equipment has
Turn controller on
been clearly marked on the serial tag the type of refrigerant that is being used.
Call for service at 888-994-
There is also a warning labels stating that the unit contains R290 refrigerant. R290
7636
is safe to use as long as you follow these warning labels.
Adjust control set point
No smoking or open flames when servicing this equipment. If needed, use a CO2
Ensure door / drawer is fully
or powder type fire extinguisher.
closed
Replacement parts used on any R290 Refrigeration system cabinet must have
Inspect the gasket for wear
specific UL certification for non-sparking components.
and position
Only authorized service technician, certified in R290 system should service this
Adjust control set point
equipment.
Pre-chill product 37ºF
MANIFOLD SET
A R134A manifold set can be used for servicing this equipment.
Initiate manual defrost
REFRIGERANT RECOVERY
Initiate manual defrost
Follow all national and local regulations for R-290 refrigerant recovery.
Initiate manual defrost
LEAKING CHECKING AND REPAIR
Leak check an R-290 system the same way you would an R-134a or R-404A
system with the following exceptions.
ACTION
1. Do not use a Halid leak detector on a R290 system.
2. Electronic leak detector must be designated specifically for combustible gas.
Inspect door/drawer sealing
Use of a bubble solution or an ultrasonic leak detector are acceptable.
Contact service
When repairing a leak, it is recommended using oxygen free dry nitrogen with a
Contact service
trace gas not exceeding 200PSI.
Clean condenser coil
When accessing an R290 system, piercing valves are not to remain on the
Inspect coil for any objects
equipment in a permanent manner. After charge is recovered, Schrader valves
obstruction hindering airflow
are to be installed on the process stubs. Proper charge is to be weighed into the
Contact service
system and the system is to be leak checked afterwards.
Verify voltage of power source,
The R290 equipment must have red process tubes and other devices through
to be performed by qualified
which the refrigerant is serviced, such as any service port. This color marking
technician
must remain on the equipment. If marking is removed, it must be replace and
Contact service
extend at least 2.5 centimeters (1") from the compressor.
Verify voltage of power source,
CHARGING
to be performed by qualified
Follow the charge amount specified on the data tag. It is recommended to use the
technician
shortest hoses possible to prevent undercharging.
Contact service
• Ensure the system is sealed and leak checked
Inspect door/drawer sealing
• Evacuate system to a minimum 500 micron
Inspect condenser coil, clean if
necessary
• Weigh in correct charge
Contact service
• Leak check the system again
Contact service
• Bleed the refrigerant from the high side hose to the low side hose
Contact service
• Disconnect the hoses
Contact service
• Remove line taps
Contact service
CAUTION: COMPONENT PARTS SHALL BE REPLACED WITH FACTORY OEM PARTS.
SERVICE WORK SHALL BE DONE BY FACTORY AUTHORIZED SERVICE
PERSONNEL, SO AS TO MINIMIZE THE RISK OF POSSIBLE IGNITION DUE TO
INCORRECT PARTS OR IMPROPER SERVICE.
CAUTION: BEFORE MAKING ANY REPAIRS, ENSURE THE UNIT IS DISCONNECTED
FROM ITS POWER SOURCE.