Electra DNG 18 Service Manual page 93

CONTROL SYSTEM
d. STEP 3: AUTO LED WALK TEST.
1) All the LEDS will turn OFF.
2) All the LEDS will turn ON for 1 second one by one in the following sequence:
STAND-BY Ö OPERATE Ö TIMER Ö FILTER Ö COOL Ö HEAT.
3) In PRX all the LEDS will turn ON for 1 second one by one in the following
sequence : 18 °c Ö 20 °c Ö 22 °c Ö 24 °c Ö 26 °c Ö 28 °c Ö 30 °c Ö
High IFAN Ö Auto IFAN Ö Med IFAN Ö Low IFAN Ö STAND-BYÖ TIMER Ö
FILTER ÖCOOLÖ HEAT.
e. STEP 4: AUTO REALY WALK TEST:
All relays will energize one by one in the following sequence:
COMPRESSOR Ö OUTDOOR FANÖR. V. Ö HEATER 1 Ö HEATER 2 Ö
INDOOR WATER PUMP Ö SWING or OUTDOOR WATER PUMP Ö INDOOR
FAN: LOW Ö MID Ö HIGH.
When the relay walk test is completed, the next test will start automatically.
f. STEP 5: FREQUENCY TESTING:
If the frequency measuring process fails the COOL LED will turn ON. In order to
move to the next step, press ON/OFF button on the remote control.
g. STEP 6: INPUT TEST.
The test purpose is to check the analog real time indicators (thermistors, LEVEL
and clock) according to the table below.
LED Indicator
STBY LED
OPER LED
TIMER LED
FILTER LED
COOL LED
HEAT LED
h. STEP 7: TIMING RESET TEST (WATCH DOG).
The test purpose is to verify that the CPU rise time after power failure is between 1
to 3 sec, test results are indicated on the LEDS : STAND-BY,OPER, TIMER and
FILTER turning ON one by one.
The results of the test are coded as follows:
Pass condition:
1 sec - STAND-BY and OPER are turned ON
2 sec - STAND-BY, OPER and TIMER are turned ON
13-30
Condition for LED to be ON
Room thermistor z 25°c
Indoor coil thermistor z 25°c
Outdoor coil thermistor z 25°c
Clock
LEVEL 2&3
LEVEL 4
Revision Y05-01
CONTENT
Service Manual - DNG Series