Hatco Imperial Series Installation And Operating Manual page 29

English
WARNING
This unit must be serviced by qualified personnel only.
Service by unqualified personnel may lead to electric
shock or burn.
Symptom
Water reaches 82°C (180°F) but
does not last through the entire
dishwasher operation.
The booster heater does not
heat at all or only delivers water
at 49°–66°C (120°–50°F).
Form No. EBOOSTERm_CN-0911
Probable Cause
Low incoming water temperature.
Incoming water temperature drops.
Flow pressure is too high.
Booster heater may be undersized.
Incorrect voltage.
Unit may have been energized without
water (dry fired).
Fuses may be blown or circuit breaker
tripped.
Over-current fuses may be blown.
Temperature setting out of calibration or
inoperable.
Contactors do not pull in.
High limit switch may be tripped or
defective.
Transformer not working properly.
Low water cutoff inoperable, contacts do
not close.
TROUBLESHOOTING GUIDE
ELECTRIC SHOCK HAzARD: Turn power OFF at
disconnect switch/circuit breaker and allow unit to cool
before performing any maintenance or cleaning.
Incoming
adequate for booster size. Increase incoming
water temperature.
Primary water supply is not adequate to
provide correct temperature in sufficient
quantities. Increase supply of primary hot
water.
Higher pressure uses an excessive quantity of
hot water. adjust flow pressure to 138 kPa
(20 psi).
Booster heater must be properly sized for
incoming water temperature and rinse
requirements of the dishwasher.
Check voltage on heater serial plate and make
sure supplied voltage matches. a 240 V
booster heater operating on 208 V reduces
wattage to 76% efficiency.
This will cause the elements to burn out
quickly. Replace the element(s).
Check for proper fuse sizing. Replace fuses.
Check/reset circuit breaker.
Check for shorted elements, bad fuse block or
short in wiring.
Temperature setting should be maximum of
88°C (190°F).
Test for voltage at coils. If coils are open or
shorted, replace contactors.
Reset switch. If switch continues to trip or
cannot be reset contact an authorized Service
agent.
Check secondary voltage, it should be the
same as the control circuit voltage. If not,
replace the transformer.
Remove probe wire and touch it to the tank. If
contacts close, probe is fouled and must be
cleaned or replaced. Relay on circuit board
maybe defective. Jumper terminals 6 & 7. If
unit energizes, circuit board is defective and
should be replaced.
29
WARNING
Corrective Action
water temperature must be