8-30
CONTROL SYSTEM
Revision Y05-01
Service Manual - DNC Series
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 OPERATE TIMER FILTER COOL HEAT.
3) In PRX all the LEDS will turn ON for 1 second one by one in the following
sequence : 18 °c 20 °c 22 °c 24 °c 26 °c 28 °c 30 °c High IFAN
Auto IFAN Med IFAN Low IFAN STAND-BY TIMER FILTER COOL HEAT.
STEP 4: AUTO REALY WALK TEST:
All relays will turn ON one by one in the following sequence :
COMPRESSOR OUTDOOR FANR. V. HEATER 1 HEATER 2 INDOOR WATER
PUMP SWING or OUTDOOR WATER PUMP INDOOR FAN: LOW MID HIGH.
When the relay walk test is completed, the next test will start automatically.
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.
STEP 6 : INPUT TEST.
This stage is testing the analog real time indicators (thermistors, LEVEL and clock) according
the table below.
LED indicator Condition for LED to be ON
STBY LED
Room thermistor ≠
≠≠
≠ 25 °c
OPER LED
Indoor coil thermistor ≠
≠≠
≠ 25 °c
TIMER LED
Outdoor coil thermistor ≠
≠≠
≠ 25 °c
FILTER LED Clock
COOL LED LEVEL 2&3
HEAT LED LEVEL 4
STEP 7 : TIMING RESET TEST (WATCH DOG).
The test purpose is to find out 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 are turning
ON one by one.
The results of the test are coded as follow:
pass condition
1 sec - STAND-BY and OPER are turn ON
2 sec - STAND-BY ,OPER and TIMER are turn ON
Fail condition
0 sec - STAND-BY is turn ON
3 sec - STAND-BY ,OPER , TIMER and FILTER are turn ON
When the timing reset test is completed, the next test will start automatically.
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