Friedrich CCF05B10A Service Manual page 18

Sequence of Operation
8.4 The indoor fan motor works as below while RT meets the set temperature to stop compressor:
a) The indoor fan motor runs for 1 min according to the set speed continuously, and then stops.
b) The indoor fan keeps the stopping status in the following 10 min if RT meets the requirement of
compressor stopping work.
c) After 10 min, the indoor fan motor runs for 20 seconds and lets the indoor air flow through the
evaporator.
d) The indoor fan works as step b) and c) circularly.
e) During above process, if RT increase or ST decrease, also RT meet the requirement of compressor
need to work, the unit exits above b), c) & d) circulation----indoor fan motor operation immediately at set
speed, and compressor also starts up while three-min protection is met.
f) If the compressor working condition is not met after switching on the unit, the indoor fan runs at
set speed for 1 min, then runs as step b) and c) circularly; If the compressor working condition is met after
switching on the unit, the indoor fan runs at set speed
g) In above circulation, the 3-min protection for compressor always function.
9. Filter cleaning function
1. The LED for air FILTER will light (ON) when the indoor fan motor work has accumulated 500 hours.
2. Pressing the FILTER button means cleaning is finished, the accumulation hours are reset to 0and start timing
again, the FILTER indicator OFF.
3. 500 accumulation hours could be reset to 0 by pressing the filter cleaning button only.
4. There is no effect on the AC operation even when the filter indicator is ON.
Assistance function
1. Display and Key button
Display: default indicates set temperature (ST).
The key buttons include POWER (ON/OFF), FAN, MODE, UP, DOWN, TIMER, SLEEP, ECO, FILTER cleaning and
HEALTH, the buzzer BIBI response for each valid button pressing.
The detailed instructions are below:
POWER ON/OFF button
When switched on, the indicator displays current set value and the running status can be adjusted by pressing buttons; there is
no display when turned off, press FAN, UP, DOWN and MODE button is invalid; In timer mode, the timer indicator ON and digital
LED displays the remained time, no other indicator, FAN and MODE button invalid. Pressing ON/OFF button may cancel the timer
function. (Note: The Auto Restart Function default activated after production in the factory.)
FAN speed button
Pressing the FAN speed button causes switchover as:
Auto speed
MODE button
Cooling Only: Cooling -Dry - Fan - Auto.
Cooling & Heating pump : Cooling - Dry - Fan - Heat - Auto.
UP / DOWN button
It is used for temperature preset and timer adjustment.
When pressing the UP or DOWN button, buzzer response, and the digital display the set temperature or the set time.
In the running status, press SLEEP button 6 times within 8 seconds will be ON or OFF the room temperature display, the buzzer
shortly BIBI twice. (by remote controller)
TIMER button
When unit is working (without time set), press TIMER button to set the AC time to shut down, the timer indicator ON.
When unit is OFF, press TIMER button to set the time of AC power on, the timer indicator ON
The timer can be set from 0.5, 1.0, 1.5, 2.0, ......10, 11, 12...... to 24 hours, it could circulate by dual direction: when showing 0.5,
pressing DOWN button, the time changes to 24, vice versa, when showing 24, pressing UP button, the time changes to 0.5.
When 88 digital display timer, press UP/DOWN to adjust the timing time, the number flashes and 10s later, the digital recovery
to display the set temperature. In order to regulate timer quickly in timing mode, pressing the UP/DOWN button for 2 seconds to
trigger continuous adjustment with the frequency 5Hz.
FILTER button
When filter light is ON, pressing this button, the light will be OFF. It will be meaningless to press this button while the light is OFF.
HEALTH button
Pressing this button to turn on anion function, if pressing once more time to shut off anion.
2 BUZZER function
Power on controller: Buzzer buzzing once for 0.3s.
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OPERATION
High speed Med speed Low speed