Ballu KFR-2501G/Y2BPE, Service Manual

Page: 31 / 70

7.CONTROL MODE
30
LCD Back Lighting
When the air conditioner is in run mode, the background of the LCD is lighted up. For different run
modes, the background shows different colors as follows:
Cooling Heating Dehumidifying Airflowing Automatic
green red green orange automatic display according to the
specific mode.
3.Switch ON/OFF
(1)
When in “Stop”(OFF) position, the air conditioner stops and does not receive the signal from the
remote controller.
(2)
When in “Run”(ON) position, the air conditioner is in the normal operating condition.
(3) When in “Stop Run”(OFF ON) position, the air conditioner is in the “automatic run” condition;
if Troom temperature 23 the air conditioner runs in heating cycle; if Troom temperature 26 , the
air conditioner runs in cooling cycle; otherwise the air conditioner works under air freshening run.
(4)
When in “Run Test” position, the air conditioner will be forced to run in the cooling cycle, and
the compressor runs at the rated frequency.
4. How to start the outdoor without the indoor?
Connect the outdoor T-RUN and COM by short circuit connection, and turn on the main power. The air
conditioner runs in the heating mode, and the outdoor fan runs at the medium airflow rate. Then disconnect
the short circuit connection, the air conditioner runs in the cooling mode (compressor delays 50 seconds),
the fan runs at the high airflow rate at first and then at the low airflow rate.
5. Indoor control time shortened to 1/60
Short circuit the indoor TEST socket, the indoor control time will be shortened to 1/60.
6. Control of the electronic expansion valve
(1) This air conditioner employs two electronic expansion valves. They control the flow rate of the
refrigerant in the indoor unit A and outdoor unit B respectively. The valve's control ability is the key to
assure the efficiency and safety of the entire air conditioning system. The testing and inspection of an
electronic expansion valve's control ability must be conducted in the air conditioner performance test
laboratory.
(2) When first powered on, the electronic expansion valve will reset first, close to the minimum and then
open to the preset value. Either compressor or outdoor fan does not start until the valve opens to the preset
position.
(3) The openness of the electronic expansion valve depends on the following factors: the compressor's
operating frequency, the values of the 10 indoor and outdoor sensor, the temperature setting, etc. The
outdoor micro-processors carries out an effective control over the valve according to the 12 parameters. In
consideration of a very high accuracy required for these values detected by the temperature sensors, special
attention must be paid during the manufacture and assembly of an air conditioner to this end.
(4) When both of the indoor units get started at the same time, the corresponding valve closes as soon as the
room temperature reaches the temperature setting. If the room temperatures corresponding to both of the
machines reach the preset value, the compressor and outdoor fan will shut down. Otherwise, the compressor
frequency will go down.
7. How to run the air conditioner at a fixed frequency?
Press the “High Efficiency ” button on the remote controller for consecutive 8 times within 10 seconds, the
air conditioner enters the standard operating condition and test itself.
°Ñ °Ñ