Taylor 428, Service Manual

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14
Troubleshooting Model 428
General Troubleshooting Guide
PROBLEM PROBABLE CAUSE REMEDY
1. No freezer operation with power
switch in the AUTO position.
a. Unit unplugged. a. Plug main power cord in the wall
receptacle.
b. Fuse blown or circuit breaker in the
OFF position.
b. Replace the fuse or place breaker
in the ON position.
c. The beater motor is out on reset. c. Place the control switch in the OFF
position and press the reset button
firmly. Place the power switch in
the WASH position and observe
the freezer's performance. Resume
normal operation.
2. With the power switch in the
AUTO position, the beater motor
runs, but the compressor does
not operate.
a. Tripped internal overload in the
compressor.
a. Allow the internal overload to cool.
Check for high head pressure,
refrigerant overcharge, stuck
pistons, or tight bearings.
b. Compressor is burned out. b. Replace the compressor.
c. Compressor is improperly wired. c. Check wiring against diagram on
compressor.
d. Low line voltage. d. Check the line voltage at terminal
block. Locate cause of voltage
drop.
e. Single‐phasing compressor
contactor.
e. Replace the compressor contactor.
3. Unit short cycles. a. Cycling on high pressure cut‐out.
Cut in: 404A: 340 PSI (2,344 kPa.)
Cut out: 404A: 440 PSI (3,034 kPa.)
a. Check the water supply (water‐
cooled units only) and make sure
the condenser is clean. Check for
potential refrigerant overcharge.
4. Compressor hums intermittently,
but will not start. Cycling on
overload.
a. Compressor is improperly wired. a. Check wiring against the diagram.
b. Low line voltage. b. Check the main line voltage and
locate voltage drop.
c. Relay contacts not closing. c. Check by operating manually.
Replace defective relay.
5. Product too stiff. a. Viscosity control is set too high. a. See the Torque Control section to
reset the control.
b. Torque Assembly incorrectly
assembled.
b. See the Troubleshooting Torque
Components section.
c. Inadequate mix in the hopper. c. Fill hopper with mix.
6. Product too soft. a. Viscosity control is set too low. a. See the Torque Control section to
reset the control.
7. Head pressure too low. a. Shortage of refrigerant. a. Locate and repair the leak.
Recover the refrigerant, evacuate,
and charge the system.
b. Water valve stuck open (water
cooled unit).
b. Clear or replace the valve.