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INDOOR BASIC FUNCTIONS
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OPERATING MODES
The system has 5 operating modes. The mode selection is done from indoor using handset.
The operating modes are:• Cool• Heat• Fan• Auto• Dry
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THERMOSTAT CONTROL
C
B
A
Cooling
-2C
-0.5C
T
0C
1.5C
THeating
-2C
A
B
C
Fan speed remains unchanged
Fan speed changes to lower rpm (300rpm)
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THERMOSTAT CONTROL
OFF condition: T falls in Zone A.
ON condition: T is above Zone C after being in Zone A.• Unit resumes operation from defrost control.• Operation is turned ON in any zones except A.• The monitoring time has passed while T is in Zone B:
Cooling/dry mode – 10 minutes. Heating – 10 seconds.
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FAN MODE
6 fan setting buttons can be set using handset:• Silent, L, ML, M, MH & H.• Silent is at LL step.
When auto fan mode is selected:• Cooling: L, ML, M, MH, H• Heating: LL, L, ML, M, MH, H• Dry: L• Powerful: H + 80rpm
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AUTO MODE
For heat pump only Mode switching point:
• Heating CoolingTr ≥ Ts + 2.5
• Cooling HeatingTr ≤ Ts – 2.5
During initial operation• Cooling operation: Tr > Ts• Heating operation: Tr < Ts
Ts + 1.5 CThermostat OFF
Ts + 2.5 C
Ts - 2.0 CThermostat OFF
Ts - 2.5 C
Heating operation
Cooling operation
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NIGHT SET MODE
Cut in when OFF timer is set.Maintain the air flow setting by user.
0.5C
1 hour
OFF timerNight set circuit ON
Temperature shift
2.0CHeating
Cooling
Unit stops at the set hours
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ECONO MODE
Maximum power consumption is limited to 700W.
Can be activated while unit is running in Cool, Heat, Dry or Auto.
Once this function is activated, the input current upper limit is applied.
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POWERFUL OPERATION To set the unit to run in full capacity. Indoor fan speed and compressor frequency is
increased. Fan speed and target set temperature will be
adjusted as follows for a 20 minute duration:
Mode Fan speed Target Ts
Cool* H + 80rpm 18C
Dry L + 80rpm Ts (dry) - 2.5C
Heat* H + 80rpm 30C
Fan H + 80rpm -
Auto Same as * Unchanged
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OUTDOOR BASIC FUNCTIONS
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OVERVIEWGenerally, compressor rotation is controlled within 5 zones: stop, drop, keep, up and reset subjected to a particular operating temperature/current/pressure.
Zone Control
Stop Compressor is stopped when a certain limit reaches the stop zone for abnormality correction.
Drop Frequency will be dropped with a timer setting.
Keep Frequency is maintained at lower/upper limit.
Up Frequency will be increased with a timer setting.
Reset Frequency lower/upper limit is canceled and returned to command rotation.
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GENERAL FUNCTIONS
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THERMISTORS
Thermistor LocationOutdoor coil ADischarge pipe BIndoor coil COutdoor air Heat sink
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To prevent frequent compressor ON/OFF & toallow pressure equalization
• The compressor will be on 3 minutes stand-by after turning OFF before it is allowed to turn ON.
• OD fan OFF delay to improve pressure equalization & to prevent refrigerant from entering into evaporator.
MINIMUM RUN CONTROL
Applicable for the whole range
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AUTO RESTART
Factory pre-set.Allow unit to automatically resume the
same operating mode it was in before a power failure.
Applicable for the whole range
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4-WAY VALVE CONTROLOFF delay of 160 second is applied when unit
is turned OFF and heating is stopped.
Operating mode 4-way valve isHeat, except for defrost ONCoolDryDefrost
OFF
Applicable for the whole range
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DEFROST CONTROL Condition for entering defrost
• Compressor minimum run time – 6 minutes AND• Accumulated run time > 28 minutes since the start or
end of a previous defrost cycle.• Similarly based on OD coil & OD air temperatures.
Condition for terminating defrost• Minimum run time of 60 seconds, THEN• 4 OD coil 22C or • Total defrost timer of 690 seconds.
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DEFROST CONTROL
ON
OFFCompressor
ON
OFF4-way valve
ON
OFFFan
EXV 400 pulse
430 pulse
Start End
690 second
60 second
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OUTDOOR FAN CONTROL
This control is carried out according to:During defrost.During powerful mode.During quite mode.During cooling/heating operation. When compressor stops, fan OFF delay 70
seconds is carried out for maintaining pressure difference.
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PREHEATING OPERATION CONTROL
Subjected to Control A and B: Control A – OD air 7C
Enter End
Td < 10C ANDTfin < 85C
Td > 12C ANDTfin 90C
Control B – OD air < 7CEnter End
Td < 20C ANDTfin < 85C
Td > 22C ANDTfin 90C
The compressor power consumption is only 35W.
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INDOOR COIL FREEZE PREVENTION Only available in cooling mode. Activation only after 2 second from the start of unit operation.
13CReset zone
Drop zone
9C
11CUp zone
7C
0CStop zone
Keep zone
Return from stop
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ROTATION REGULATINGFUNCTIONS
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OVERVIEW
Command Rotation
Starting RotationT
Defrost*
Limit Rotation
Lower limit rotation
Upper limit rotation
Target Rotation
* Defrost control for heat pump model only
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STARTING ROTATION
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STARTING CONTROL
To avoid excessive oil discharge from compressor or to promote oil lubrication during startup.
To prevent liquid flood back to the compressor. To limit starting current. When compressor starts to rotate from OFF to
ON, compressor rotation is set to run gradually to each upper limit at a specific timer setting.
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STARTING CONTROL
Applicable for 5LCY Series I
Compressorrotation, f
Time (second)180 180 10
ModelCooling Heating
Min. fMax. f
5LCY10ER-5WMY10KR 66 Hz 92 Hz 24 Hz
5LCY15ER-5WMY15KR 90 Hz 98 Hz 28 Hz
58
72
90
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COMMAND ROTATION
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COMMAND ROTATIONCut in upon termination of Starting Control.Achieve capacity control by controlling the
compressor rotation based on :• Temperature difference between set and room
temperature, T.• Limit Rotation.• Defrost control.
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COMMAND ROTATION
PI CONTROL Based on P control & I control. P control: T of each indoor is calculated at every sampling
time of 20s and compressor rotation is adjusted according to the difference from the previously calculated rotation.
I control: if the operating frequency is not changed more than a certain fixed time:• If T is small lower frequency.• If T is large increase frequency.
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LIMIT ROTATION
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LIMIT ROTATION
Determine from• Upper limit rotation
A minimum value is determine among the upper limits rotation, i.e. protection controls.
• Lower limit rotationA maximum value is determine among the lower limits
rotation, i.e. protection controls.
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HIGH PRESSURE PROTECTION
The compressor frequency is adjusted based on indoor coil temperature in heating mode & outdoot coil temperature in cooling mode.
Activation only after 2 second from the start of unit operation.
65C
Reset zone
Drop zone52C
55C
Up zone
50C
Stop zone
Keep zone
45C
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DISCHARGE PIPE TEMPERATURE CONTROL
Applicable for 5LCY Series I & 5MSY
110C
Reset zone
Drop zone101C
105C
Up zone
99C
Stop zone
Keep zone
97C
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If compressor discharge temperature >105°C, this control starts and set the current frequency as upper limit. At the same time, running frequency start to reduce by 1 step and so on, until temperature falls between 105°C)and 101°C – at the keep zone.
This protection will cut in when the compressor discharge temperature > 110°C. The compressor will stop and considered trip.
If the compressor discharge temperature < 97°C, the compressor frequency will be reset based on the OD ambient, set and room temperature.
DISCHARGE PIPE TEMPERATURE CONTROL
Applicable for 5LCY Series I & 5MSY
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OVERALL CURRENT CONTROL
Mode Cooling Heating
L2Normal 6.0A 6.75A
ECONO 2.75A 2.75A
L3Normal 5.25A 6.0A
ECONO 2.0A 2.0A
Applicable for 5LCY Series I & 5MSY
14A
L2
L3
Stop zone
Drop zone
Keep zone
Reset zone
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OVERALL CURRENT CONTROL
Frequency control in each zone: Drop zone
• Set compressor maximum limit = operation frequency – 2 Hz.• After that, frequency is dropped by 2 Hz/second until it reaches
Keep zone. Keep zone
• The current maximum frequency is remained. Reset zone
• Compressor frequency is reset based on T & ambient. Stop zone
• After monitoring for 2.5 second, the compressor will stop if current does not fall below 14A.
Applicable for the whole range
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THANK YOU&
Q & A