TECHNICAL TRAINING INVERTER-Y K-SeriesALGORITHM. INDOOR BASIC FUNCTIONS.

Technical Training Technical Training

INDOOR BASIC FUNCTIONS


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


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)


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.


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


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


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


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.


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


OUTDOOR BASIC FUNCTIONS


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.


GENERAL FUNCTIONS


THERMISTORS

Thermistor LocationOutdoor coil ADischarge pipe BIndoor coil COutdoor air Heat sink


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


AUTO RESTART

Factory pre-set.Allow unit to automatically resume the

same operating mode it was in before a power failure.



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



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.


DEFROST CONTROL

ON

OFFCompressor

ON

OFF4-way valve

ON

OFFFan

EXV 400 pulse

430 pulse

Start End

690 second

60 second


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.


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.


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


ROTATION REGULATINGFUNCTIONS


OVERVIEW

Command Rotation

Starting RotationT

Defrost*

Limit Rotation

Lower limit rotation

Upper limit rotation

Target Rotation

* Defrost control for heat pump model only


STARTING ROTATION


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.


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


COMMAND ROTATION


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.


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.


LIMIT ROTATION


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.


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


DISCHARGE PIPE TEMPERATURE CONTROL

Applicable for 5LCY Series I & 5MSY

110C

Reset zone

Drop zone101C

105C

Up zone

99C

Stop zone

Keep zone

97C


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



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


14A

L2

L3

Stop zone

Drop zone

Keep zone

Reset zone


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.



THANK YOU&

Q & A

TECHNICAL TRAINING INVERTER-Y K-SeriesALGORITHM. INDOOR BASIC FUNCTIONS.

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Transcript of TECHNICAL TRAINING INVERTER-Y K-SeriesALGORITHM. INDOOR BASIC FUNCTIONS.