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Section 9
PROBLEM
1. Solution takes excessively
long to freeze to a slush
consistency.
2. Unit does not operate
after control switch is
pressed (no fan or
compressor operation).
Troubleshooting Guide
Troubleshooting Guide
PROBABLE CAUSE
a. Solution added to removable basin
was above 4_C (40_F).
b. Improper use of heat transfer
medium.
c. Shortage of refrigerant as
evidenced by low suction and
head pressures.
d. Solution was left in removable
basin unattended. No scraping.
Ice formed on basin walls;
therefore, solution in center of
basin remains liquid.
e. Faulty automatic expansion valve
as evidenced by suction pressure
not stabilizing at 3 -- 4 PSI (21 --
28 kPa). (Pressure fluctuates.)
f. Dirty condenser as evidenced by
high head pressure.
g. Compressor is going out on
overload.
h. Fan does not operate as
evidenced by high head pressure.
i. Oil is trapped in copper tubing
around the insulated evaporator.
a. Unit is unplugged.
b. Control switch is defective.
c. Faulty coil in compressor
contactor as evidenced by line
voltage at the coil, but no
compressor or fan operation.
14
REMEDY
a. Solution added to the removable
basin should be below 4_C
(40_F).
b. Heat transfer medium must be a
good conductor of heat and
pre--cooled prior to adding the
solution.
c. Call a service technician.
d. Constant scraping and agitating is
necessary to refrigerate the
solution.
e. Call a service technician.
f. Clean the condenser regularly.
g. Allow the compressor to cool. It
will automatically start up again.
Check to make sure the unit is the
only appliance running on the
same 15A circuit.
h. Call a service technician.
i. Call a service technician.
a. Plug into appropriate wall
receptacle.
b. Call a service technician to
replace the control switch.
c. Call a service technician to
replace the compressor contactor.
Model 20
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