24
25
8. ELECTRONIC FUNCTIONS
def.
tim er
ion
8.1 Abbreviations
T
1
: Indoor room temperature
T
2
: Coil temperature of evaporator
T
3
: Coil temperature of condenser
T
4
: Outdoor ambient temperature
T
5
: Compressor discharge temperature
8.2 Display functions
8.2.1 Icon explanation on indoor display board.
Run Indication Lamp:
This lamp lights up when the air
conditioner is in operation.
Auto Indication Lamp:
Lights up during the Auto operation
Ion Indication Lamp:
Lights up when Ionizer/Plasma
function is activated.
Timer Indication Lamp:
Lights up during Timer operation
Defrost Indication Lamp:
This indicator lights up when the
air conditioner starts defrosting automatically or when the
anti-cold wind function is activated in heating operation.
DIGITAL DISPLAY Indication Lamp:
Displays current
setting temperature or malfunction codes when the air
conditioner is in operation.
run
8.3 Main Protection
8.3.1 Three Minutes Delay at restart for compressor
A 1 minute delay for the 1st start-up and 3 minutes’ delay for
subsequent re-starts.
8.3.2 Temperature protection of compressor top
The unit will stop working when the compressor top temperature
protector cuts off, and will restart after the compressor top
temperature protector restarts.
8.3.3 Temperature protection of compressor
discharge
When the compressor discharge temperature increases, the
running frequency will be limited as stated below:
• Compressor discharge temp. T
5
> 115° for 5s, compressor will
stop.
• 108° < T
5
< 115°, decrease the frequency to the lower level
every 3 minutes.
• 90° < T
5
< 105°, keep running at the current frequency.
• T
5
< 90°, no limit for frequency.
8.3.4 Fan Speed is out of control
When Indoor Fan Speed remains too low (300RPM) for a certain
time, the unit will stop and the LED will display the failure.
8.3.5 Inverter Module Protection
The Inverter module has a protection function related to current,
voltage and temperature. If one of these protection functions
occur, the corresponding code will display on the indoor unit and
the unit will stop working.
8.3.6 Indoor fan delayed 10 seconds open function
When the unit starts up, the louvre will be active immediately
and the indoor fan will open 10 seconds later. If the unit runs in
heating mode, the indoor fan will be also controlled by the anti-
cold wind function.
8.3.7 Compressor pre-heating functions
Pre-heating permitting condition:
If T
4
(outdoor ambient temperature) < 3° and the machine has
just been turned on or if T
4
< 3° and compressor has been
switched off for over 3 hours, the compressor heating cable will
work.
Pre-heating mode:
If the current fl ow through the wiring terminal of the compressor is
too low, the compressor can get heated even if it is not operating.
Pre-heating release condition:
If T
4
> 5° or the compressor starts running, the pre-heating
function will stop.
8.3.8 Zero crossing detection error protection
If the unit detects that the time interval is not suffi cient for a
continuous 240 secs, the unit will stop and the LED will display
the error. The correct zero crossing signal time interval should be
between 6-13 mins.
8.4 Operation Modes and Functions
8.4.1 Fan mode
1. Outdoor fan and compressor stop.
2. Temperature setting function is disabled, and no setting
temperature is displayed.
3. Indoor fan can be set to high/med/low/auto.
4. The louvre operates same as in cooling mode.
5. Auto fan:
8.4.2 Cooling Mode
8.4.2.1 Compressor running guidelines
The maximum operating frequency of the compressor after
starting is specifi ed in the diagram below:
27.5
27
High
Low
25
Medium
25.5
45
43
40
38
30
28
22
20
Fmax=F4
Fmax=F7
Fmax=F8
Fmax=F6
Fmax=F3
E963_Lennox Luna Inverter Service Manual 4.indd 24-25
E963_Lennox Luna Inverter Service Manual 4.indd 24-25
2/02/12 10:13 AM
2/02/12 10:13 AM
