Hubbell JHX, Installation, Operation And Maintenance Manual

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29
SECTION V
– TROUBLESHOOTING
Common Issues:
Symptom Probable Cause Corrective Action
Water reaches setpoint
temperature but does
not last through the
entire dishwasher
cycle. Low incoming water
temperature. Incoming water temperature must be
adequate for the booster size. Increase the
incoming water temperature.
Incoming water
temperature is
dropping. Primary water supply is not adequate to
continually provide correct temperature in
sufficient quantities. Increase the supply of
primary warm water.
Water pressure is too
high. Higher water pressure uses an excessive
supply of hot water. Verify a pressure
reducing valve is installed and adjust the
water pressure to the dish machine
specifications.
Booster heater may be
undersized. The booster heater must be properly sized
for the incoming water and rinse
requirements of the dishwasher. If
required, replace with a properly sized unit.
Incorrect voltage. Voltage available at the booster heater
must be correct for unit. Verify voltage on
all phases matches nameplate on the
booster heater.
Gauge(s) not reading
correctly. Check the temperature of the water with a
thermometer to verify the gauges are
working properly. Replace gauges, if
required.
Temperature setpoint
too low. Adjust the temperature setpoint.
Water at the
dishwasher is not the
proper temperature. Booster heater piping to
the dishwasher is not
insulated. If there is more than 5 linear feet of piping
between the booster heater and the
dishwasher the piping should be wrapped
in insulation or a recirculating system
should be installed.
Bypass valve is open or
allowing water to pass
when closed. Verify that the bypass valve between the
hot and warm water lines is closed. If
condition continues, replace the bypass
valve.
If none of the above addresses and solves the issue, proceed with the Initial Evaluation.