REV 8/03
19
18. FAN OVERLOAD ALARM (optional)
This alarm requires a motor overload relay that is wired to the alarm optional input and menu #42,“OPT
ALARM 3”, is set for “FAN OVERLD”. When overload relay is energized, alarm will goes off until the alarm
condition is corrected.
19. LOCAL ALARM (optional)
This alarm requires a 24 VAC signal applying to the alarm optional input and menu #41 or #42 are set for
“LOCL ALARM”. This alarm can be used as a custom alarm. When 24 VAC signal is not present, alarm
will goes off until 24 VAC signal resumes.
20. LOW PRESSURE 1 ALARM (optional)
Apply for single compressors system only. The low pressure 1 alarm is set on menu #41, “OPT ALARM
2”. This alarm goes off when the low pressure switch opens. “LOW PRES C1” message is displayed and
audio alarm is activated. Compressor is off and alarm stays on until the low pressure is corrected.
21. LOW AC VOLTAGE WARNING
When 24 VAC power supply that feeds the MINI-DAP II drops below 18 VAC, this alarm will goes off until
24 VAC power is back to normal.
Troubleshooting
1. The power must be turned off before servicing or replacing the panel.
2. Factory notification is required before any parts are replaced in the panel.
PROBLEM POSSIBLE CAUSE CHECK OR REMEDY
No power or panel does
not come on.
Main disconnect switch is off. Turn main disconnect switch on.
Optional remote shutdown
contact is opened.
Check remote shutdown contact.
Loose connections on pin #2
and #3 of TB1 (24vac input) on
Mini-DAP II board.
Check the connections on pin #2 and pin
#3 of TB1. Also check 24 VAC between
pin #2 and #3.
PCB fuse of Mini-DAP II is
blown.
Check PCB fuse and replace with 1 amp
fuse if necessary.
Transformer circuit breaker is
tripped.
Reset the circuit breaker on the control
transformer inside unit electrical box.
Operates but no display. Loose connections on IC chips
of PC board.
Turn panel off. Firmly press on all IC chips
that plug into sockets on the board.
Improper LCD adjustment. Adjust the LCD adjust pot on the top left
hand corner the PC board
Display is too dim or too
bright.
Improper LCD adjustment. Adjust the LCD adjust pot on the top left
hand corner the PC board
Self-Test Failures:
EPROM: FAIL
Loose connection or
contaminated EPROM.
Insure EPROM chip is secured in U9
socket on PC board. Replace EPROM.
EEPROM: FAIL Loose connection or
contaminated.
Insure EEPROM chip is secured in U20
socket on board.
VAC A TO D: FAIL Bad 24 VAC power supply or
sensors wiring are incorrect
Check 24 VAC across pin #2 and #3 of
TB1, make sure it is 24VAC± 10%.
Refer to unit wiring diagram to check
sensor wiring
RTN SENSOR: FAIL
(return air temp sensor)
Loose connections or sensor is
wired incorrectly.
Check connections and wiring. See
temperature sensor problem.
HUM SENSOR: FAIL
(relative humidity sensor)
Loose connections or sensor is
wired incorrectly.
Check connections and wiring. See
humidity sensor problem.
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