Service manual

40
<Auto vane drive>
(a) The auto vane is driven by DC12V motor.
(b) Airflow direction is selected depends on the number of pulse were sent.
(c) Before start driving the auto vane, detect the standard position first, output the number of pulse to each airflow.
(d) The speed of the auto vane drive for both open and close are set at 200 pulse/sec.
(e) Method of driving the auto vane.
1 Detecting the standard position :
Output 1448 (PCH-2~3),1498 (PCH-4~6)
2 Position setting :
Output the number of pulse indicated no below chart to the closing direction.
(4) Detecting abnormalities in the outdoor unit
After the compressor has been continuously operated for 3 minutes, if the difference between the indoor coil temperature
and room temperature is out of RANGE C for 1 minute, the indoor fan speed will turn to LOW. Five minutes later, if the dif-
ference is still out of RANGE C,the outdoor unit is functioning abnormally. Thus, the compressor stops and check code
“P8” appears on remote controller.
RANGE A : Indoor coil temperature is more than 5 degrees above room temperature.
RANGE B : Indoor coil temperature is within 5 degrees either way of room temperature.
RANGE C : Indoor coil temperature is more than 5 degrees below room temperature.
Indoor coil temperature
minus room temperature.
+5
0
-5
RANGE A
RANGE B
RANGE C
(degree)
(5) Drain pump control (OPTION)
The drain pump works in COOL or DRY operation. When operation stops or changes to HEAT mode, the drain pump con-
tinues to operate for 3 more minutes. The drain pump does not work in check mode.
<Drain sensor>
When both the drain pump and unit are operating, the drain sensor detects the temperature. This temperature tells
whether the drain water level is above or under the drain sensor. If the drain water level rises above the drain sensor due
to a drain pump malfunction, the unit will stop operating in order to prevent drain from overflowing. The check code “P5” on
the remote controller will display this occurrence. When either of the following conditions are satisfied, the drain sensor is
determined to be under water.
● Though the drain sensor has been heated by the drain sensor heater for more than 40 seconds, its temperature rise is
less than 20 degrees.
● The drain sensor temperature is below 63°C.
The number of pulse output after
directing the standard position
Close
Horizontal
Downward A
Downward B
Downward C
PCH-2~3
1448
247
435
624
813
PCH-4~6
1498
318
511
693
817