Haier HSU-12HSA03 User manual

Haier air conditioner Edition: 20070116
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Domestic
Air conditioner
CAUTION
READ THIS MANUAL
CAREFULLY TO
DIAGNOSE TROUBLE
CORRECTLY BEFORE
OFFERING SERVICE.
THIS MANUAL IS USED
BY QUALIFIED
APPLIANCE
TECHNICIANS ONLY.
HAIER DOES NOT
ASSUME ANY
RESPONSIBILITY FOR
PROPERTY DAMAGE
OR PERSONAL INJURY
FOR IMPROPER
SERVICE
PROCEDURES DONE
BY ONE UNQUALIFIED
PERSON.
HSU-09HSA03/R2(DB)
HSU-12HSA03/R2(DB)

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CONTENTS
1. GENERAL INFORMATION...............................................................3
2. SPECIFICATION...............................................................................6
3. ELECTRICAL CONTROL..................................................................8
4. THERMISTER RESISTANCE CHART.............................................30
5. TROUBLE SHOOTING....................................................................40
6. PERFORMANCE CURVES DIAGRAM...........................................46
6.1 High drop and long pipe capacity modification curves…………………………......46
6.2.1 Cooling capacity-temperature curves……………………………………………. .4 7
6.2.2 Heating capacity-temperature curves……………………………………………..49
6.3 Air outlet temp.-ambient temperature curves……………………………………….51
6.4.1 Cooling discharge pressure curves...................................................................53
6.4.2 Cooling suction pressure curves.......................................................................55
6.4.3 Heating discharge pressure curves...................................................................57
6.4.4 Heating suction pressure curves.......................................................................59
6.5 Sensible cooling value-temperature curves.........................................................61
6.6 Power consumption-temperature curves.............................................................63
6.7 Noise curves........................................................................................................65
6.8 Compressor performance curves………………………………………………........66
7. WIRING DIAGRAM..........................................................................68
8. SCHEMATIC DIAGRAM OF PCB....................................................70
9. INSTALLATION................................................................................72

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1. General information
This Service Manual describes the operation, disassembly, troubleshooting, and repair of Haier Room
Air Conditioners, etc. It is intended for use by authorized services who troubleshoot and repair these
units.
It is assumed that users of this manual are familiar with the use of tools and equipment used to
troubleshoot and repair electrical, mechanical, and refrigeration systems; and understand the
terminology used to describe and discuss them.
Haier urges you read and follow all safety precautions and warnings contained in this manual. Failure
to comply with safety information may result in severe personal injury or death.
Related Publications
This is a base service manual, covering a range of similar models. It is intended to be used in
conjunction with the Parts Manual and Technical Sheet covering specific model being serviced.
NOTE: General Precautions and Warnings
WARNING
To avoid risk of personal injury or death due to electrical shock, disconnect electrical power to unit
before attempting to service the unit.
WARNING
To avoid risk of personal injury or death due to electrical shock, DO NOT, under any circumstances,
alter the grounding plug .Air conditioner must be grounded at all times. Do not remove warning tag
from power cord. If a two-prong (non-grounding) wall receptacle is encountered, contact a qualified
electrician and have the receptacle replaced with a properly grounder wall receptacle in accordance
with the National Electrical Code.
WARNING
To avoid risk of heat exposure, which may cause death or severe illness, air conditioner must be
monitored when failures or shuts down.
WARNING
To avoid risk of personal injury or death due to electrical shock, grounding wires and wires colored like
grounding wires are NOT to be used as current carrying conductors. The standard accepted color
coding for ground wires is green or green with a yellow stripe. Electrical components such as the
compressor and fan motor are grounded through an individual wire attached to the electrical
component and to another part of the air conditioner. Grounding wires should not to be removed from
individual components while servicing, unless the component is to be removed and replaced. It is
extremely important to replace all removed grounding wires before completing service.

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MODEL: HSU-09HSA03/R2(DB)
Product Features
Healthy negative ion
Intelligent airflow
Entire auto mode
ESF filter
Easy clean design
Main Specification
Cooling Capacity: 2400W
Power Input: 680W
Current Input:3.50A
EER:3.53
Heating Capacity: 2650W
Power Input:730W
Current Input: 3.8A
COP: 3.63
Air Volume(Indoor/outdoor): 400m3/h
Power Supply: 1PH/230V/ 50Hz

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MODEL: HSU-12HSA03/R2(DB)
Product Features
Healthy negative ion
Intelligent airflow
Entire auto mode
ESF filter
Easy clean design
Main Specification
Cooling Capacity: 3300W
Power Input: 1078W
Current Input: 4.9A
EER:3.06
Heating Capacity: 3600W
Power Input:1230W
Current Input: 5.4A
COP: 2.93
Air Volume(Indoor/outdoor): 450m3/h
Power Supply: 1PH/230V/ 50Hz

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2. Specification
Item Unit HSU-09HSA03
/R2(DB)
HSU-12HSA03
/R2(DB)
Power PH, V, Hz 1, 230, 50 1,230,50
Climate Type T1 T1
Starting Current A 10 12
Cooling Capacity W 2400 3300
Rated Power W 680 1078
Rated Current A 3.50 4.9
Max Power W 870 1350
Max Current A 3.8 6.0
Cooling
EER W/W 3.53 3.06
Heating Capacity W 2650 3600
Rated Power W 730 1230
Rated Current A 3.8 5.4
Max Power W 1100 1480
Max Current A 4.4 6.8
Heating
EER W/W 3.63 2.93
Cooling ć18~46 18~46Operating temp.
range Heating ć-15~24 -15~24
H rpm 1150 1300
M rpm 950 950
Indoor fan Velocity
L rpm 740 740
Outdoor fan Velocity rpm 710 800
Indoor Air Volume (High) m3400 450
Max. pressure at warm side MPa 4.15 4.15
Moisture Removal 10-3 m3/h 0.83 1.2
Indoor (H/M/L) dB(A) 42/40/38 42/40/38
Noise Level
Outdoor dB(A) 48 52
Net Kg 8.6 8.6
Indoor Weight
Gross Kg 10.8 10.8
Net Kg 31 33
Outdoor Weight
Gross Kg 34 36
Net mm 760× 182× 285 760× 182× 285
Indoor Dimension Package mm 837× 282× 312 837× 282× 312
Net mm 780× 245× 540 780× 245× 540
Outdoor Dimension
Package mm 790× 366× 484 790× 366× 484
Manufacture TOSHIBA SANYO
Type DA89X1C-20FZ C-6RZ092H1A
Compressor
Oil Charge ml 370 320

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Type R410A R410A
Net Charge g 800 1200
Refrigerant
Charge if over standard pipe
length g/m 12 12
Liquid pipe Diameter mm 6.35 6.35
Gas pipe Diameter mm 9.52 12.7
Standard length m 5 5
Refrigerant Pipe
Max length m 15 15
Length mm 2000 2000
Drain Hose
Diameter mm 16 16
Drainage pipe material diameter mm 16 16
Remote Controller Model YR-H04 YR-H04
Class of electric Shock Protection I I
Class of Water Proof IP 24 IP 24
Power Cord (Model × Sectional Area) H05VV-F 3G2.5mm2H05VV-F 3G2.5mm2

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3. Electrical control
ĉ. Scope of Application
This specification use for HSU-09/12HSA03/R2˄DB˅frequency conversion air condition are manufactured
by Haier air condition parent company. "Setting value" (express in parameter) in this specification
means is a parameter that is stored in EEPROM. Refer to [EEPROM parameter table].
1. Chip pin definition
This controller adopts MOTROLA MC68HC908 AB32; Chip each pin definition as following:
1 PTC4 door switch
2 IRQ
3 RST over-zero detection
4 PTF0/TACH2 remote control receiving
5 PTF1/TACH3 SDA
6 PTF2/TBCH2 SCL
7 PTF3/TBCH3 Buzzer
8 PTF4/TBCH0 Swing stepping motor A
9NC
10 PTF7 Swing stepping motor D
11 PTF5/TBCH1 Swing stepping motor B
12 PTF6 Swing stepping motor C
13 PTE0/TXD network output
14 PTE1/RXD network output
15 PTE2/TACH0 PG feedback
16 PTE3/TACH1 PG output
17 PTE4/SS fresh air
18 PTE5/MISO negative ion output
19 PTE6/MOSI self check/ decrease time
20 PTE7/SPSCK empty
21 VSS GND
22 VDD VCC
23 PTG0/KBD0 ultraviolet ray A
24 PTG1/KBD1 empty
25 PTG2/KBD2 empty
26 PA0 selection panel 1 sliding stepping motor A
27 PA1 high/low drive model sliding stepping motor B
28 PA2 large/small model sliding stepping motor C
29 PA3 A/B code selection sliding stepping motor D
30 PA4 panel selection 2 pushup stepping motor A
31 PA5 pushup stepping motor B

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32 PA6 pushup stepping motor C
33 PA7 pushup stepping motor D
34 PTB0/ATD0 output outdoor communication
35 PTB1/ATD1 input outdoor communication
36 PTB2/ATD2 room temperature
37 PTB3/ATD3 inner coil
38 PTB4/ATD4 swing left stepping motor D
39 PTB5/ATD5 swing left stepping motor C
40 PTB6/ATD6 swing left stepping motor B
41 PTB7/ATD7 swing left stepping motor A
42 PTD0 swing right stepping motor D
43 PTD1 swing right stepping motor C
44 VDDAREF VCC
45 AVSS/VREFL GND
46 PTD2 swing right stepping motor B
47 PTD swing right stepping motor A
48 PTH0/KBD3 central control input
49 PTH1/KBD4 central control output
50 PTD4/TBCLK empty
51 PTD5 G/V LCS K health H heat
52 PTD6/TACLK G/V WR K operation H dry
53 PTD7 G/V DA K power supply H cool
54 VREFH VCC
55 VDDA VCC
56 VSSA GND
57 CGMXFC
58 OSC2
59 OSC1
60 PTC0 emergency switch
61 PTC1 empty K timer
62 PTC2/MCLK G/V green light K green light H
operation
63 PTC3 G/V blue light K blue light H timer
64 PTC5 G/V red light K red light H health
II. Temperature adjustment function
2.1 During temperature adjustment function, the operation frequency of outdoor unit will be based on
indoor temperature and the set temperature.
When air capacity operates automatically; the indoor fan will be controlled on the basis of the
requirements of temperature adjustment.
When the unit operates to make heat, the indoor wind unit will be controlled based on scrolling
temperature.

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2.1.1 Standard of temperature sensor under indoor environment.
When the line is in short circuit or open circuit, the indicator light will be alarming and the indoor fan
motor will be off. It will resume to the original state automatically after it returns normally, and operates
as usual.
Short circuit:
Temperature: above 126 degrees,
Hex: Above F8H,
Value of Resistance: Below 0.65K, above 4.85V.
Normal temperature:
Temp: 25 degrees,
Hex: 40H,
Value of Resistance: 23K,
Voltage: 2.33V.
Power failure:
Temp: below -31 degrees,
Hex: below 08H,
Value of Resistance: Below 620K,
Voltage: Below 0.15V.
B parameter=4200
R (25degrees) =23K
2.1.2 Value of Resistance of indoor temperature sensor is ignored, when the heat mode is ON and the
indoor fan is OFF, as well as after warm start indoor fan operate for 30 seconds. (in order to avoid
affection of heat exchanger)
2.2 When frequency increase to holding frequency
In order to oil return fully during operating, the system will must keep some frequencies for a period of
time.
Time Indication Frequency indication
Drying in cool mode Heat Defrosting in heat mode Holding frequency
60 seconds 60 seconds 30 seconds 58Hz
After Forced operation OFF at the start status, system will begin to control the temperature area.
2.3 Preset temperature correction
The preset temperature is corrected according to the operating mode, air capacity and forced
operation status.
Only in the heat mode to correct the air capacity, confine to the low and middle speed of the air
capacity.
Corrected value table for preset temperature:

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Mode Corrected contents Corrected variable Corrected
parameter
Correct the operating mode ETBL0 4.67ć
Correct forced operating mode ETBL1 6ć
When the air capacity is low to
correct it ETBL2 4.67ć
Heat
When the air capacity is low to
correct it ETBL3 4.67ć
Correct the operating mode ETBL4 -0.33ćCool and
dry mode Correct the forced operating mode ETBL5 -4ć
2.4 Control the temperature the area
2.4.1 Deviation
Calculation the deviation of the temperature area, as following:
Heat: E= (remote control preset temperature + corrected value)-room temperature
Cool and dry: E=room temperature - (remote control preset temperature+ corrected value)
2.4.2 Compressor OFF
˄
OFF
˅
When E is negative and |E|>?T:
Heat Cool
? T TCHAHL 0.67 TCHACL 0.33
After ?T variation TCHAHH 0.67 TCHACH 1
?T variation condition When the system is start to operate, E=3.0ć,
The compressor will be stopped after detected continuously for 120 seconds.
After operation starts, when compressor turns off at the first time, based on the above conditions, the
unit should operate according to ?T variable data. Between the time when compressor is off and
restarts, the unit should operate on ?T starting data (Except dry) and operating mode is transferring.
(Except the case that waiting unit is off). Compressor starts when the wrap E is larger than –?T. When
compressor is operating and the set temperature by the remote control changes in the orientation that
compressor is off, in addition, it is below –?T, compressor will be off.
2.4.3 Compressor operating
During the time when compressor is off, after waiting for 3 minutes, the deviation E is much larger
than-ƸT +0.67ć, compressor will start to operate.
2.4.4 DASH operation
When the system starts to operate or to switch the operation mode (except compressor first to off and
then to on), when the compressor is on, the system will indicate the maximum frequency satisfied
condition as following:
Cool deviate to 0
Dry deviate to G area
Heat deviate to F area

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When the system is in test run, emergency operation, silencing operation mode, the DASH will be
stopped.
2.4.5 Temperature adjustment section
˄
DASH operation condition in the different mode
˅
2.4.6 Frequency in the different mode
In this area, the frequency (from indoor to outdoor) indication as following:
When the system is in the cool and dry mode, the frequencies between A area and B area are same.
In the silencing operation mode, the frequencies between A-E area and F area are same.
Indication frequency Scope of
frequency
Temperature
changing area
Heating FQHOT [0—7] 30-140Hz A—H
Heat in Silence mode FQSHOT [0—2] 30-72Hz F—H
Dry FQDRY [0—7] 30-98Hz B—H
Cooling FQCOOL [0—7] 30-98Hz B—H
Cooling in silence mode FQSCOOL [0—2] 30-64Hz F—H
The maximum frequency is the maximum frequency value as above table.
The max or min frequency in the cool or heat mode is corresponding with the max or min frequency
value as the above table.
2.4.7 Control frequency in the same area
The compressor operating by the identity frequency for 3minutes that its area has no change, the
indication frequency will be changed.
The timer will be reset when you input the different frequency. The system’s temperature area have no
change when the system operating by new frequency for 3 minutes, please changing its indication
frequency (add FQUPH or FQUPL).

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Controlling table in the identity area˖
Temperature change area
AB C D E F G H
Heat FQUP(2Hz) FQUP(2Hz) FQUP(2Hz) FQUP(1Hz) FQUP(1Hz)
Cool and dry FQUP(2Hz) FQUP(2Hz) FQUP(2Hz) FQUP(1Hz) FQUP(1Hz)
FQUPH˖2Hz˗FQUPL˖1Hz
2.4.8 Air capacity decision when Air capacity is running automatically.
When air capacity is running automatically, based on temperature adjusting sections, you shift the
switch for air capacity, namely, enhanced, middle, and weak.
When air capacity is running automatically, shown following air capacity table.
H---High M----Middle L---Low
Temperature adjustment section
ABCDE F GHI
Heat H H H H H M LLSL
O
Cool H H H M M LLL
Dry H M M M L L SLO SL
O
2.5 Defrost
When the high load precaution control operating, the priority is precaution control operating.
Compressor is not off.
During the heat-making operation, communication of outdoor unit will deliver defrosting signal (I21=10),
indoor unit will be based on defrosting controlling. It will continue until communication of outdoor unit
delivers defrosting released signal (I21=01), indoor unit will be on heat-making operation directly. Air
capacity will be of under the temperature controlling section of heat making.
2.6 Air capacity limited
During compressor operating, when the maximu m speed of indoor fan be set middle or low speed, the
upper limit of indication frequency shown respectively as following:
Frequency number of air capacity limit table:
Limiting frequency variable Limiting frequency
Air capacity middle limit FQLIMMD 90Hz
Air capacity low limit FQLIMLO 52Hz
Upper and down limit of fresh
air capacity frequency
FUPHEAL 30Hz
Estimate the limiting frequency condition in heat mode; first, estimate it whether is the limiting
frequency condition of set low fan or health fan. If there have set low fan, health fan or both of them, to

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correction the limit frequency according to the following condition:
Outdoor temperature condition Indication frequency
011(20ćmore than) Low fan or health fan limited frequency 48Hz
010(15-20ć) Low fan or health fan limited frequency
+FUPHEA1
50Hz
001(10-15ć) Low fan or health fan limited frequency
+FUPHEA2
52Hz
000(10ćdownward) In general frequency

ċ. Indoor fan motor control
Objective revolutions:
When air capacity is set for controlling by hand; it is the revolution of (High + Low)/2.
When it runs automatically, it is the revolution of (automatically high + automatically low)/2. (No
account the revolution when it doesn’t reach 10rpm)
3.1 Heat operation
3.1.1 Warm start
A, Control cool air during heating˖
Heat exchange temperature˖
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Based on the heat exchange temperature to control the indoor fan as the above shown.
1. When the heat exchange temperature rise, to distinguish the fan speed based on the heat exchange
temperature:
The heat exchange temperature is less than 35.2 , the speed of fan motor isćweak (for the first power
on, when the system operating in heat mode or OFF the defrost mode, and when the heat exchange
temperature is less than 25.2 , the fan mćotor will OFF; if the temperature is between 25.2 andć
35.2 , the fan motor willćbe weak speed operating);
The fan motor operating with low speed when heat exchange temperature is between 35.2 andć
37ć˗
The heat exchange temperature is more than 37 , faćn motor operating by the set speed.
2. When drop of the heat exchange temperature, to distinguish the fan speed based on the heat
exchange temperature:
The fan motor operating with low speed when heat exchange temperature is between 35.2 andć
25.2 ;ć
The fan motor always operates with little-low speed when heat exchange temperature is less than
25.2 . (for the first power on, when the system operating in heat mode orćstopping the defrost mode,
and when the heat exchange temperature is between 25.2 and 16ć, the fan motor will operatingć
with weak speed; when the temperature is drop down to under16 , the fan motor will be stopped.ć˅
3. During the heat exchange temperature is risingˈfan speed is in the weak and low speed status, if
the heat exchange temperature don’t return to previous value after 4 minutes, the fan speed will rise
and continuously operating by the set temperature for 4 minutes, the system will adjustment the fan
speed based on the heat exchange temperature;
4. When the heat exchange temperature is dropping down, the fan speed will go up to the set speed
if the fan motor operate continuously by the low speed for more than 4 minutes.

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3.1.2 Compressor OFF and waiting for 3 minutes
1. The compressor is OFF (the flamestat is OFF), the air capacity will change from small to little small
after 20 seconds (is SSLO in silence mode);
2. To heat operating in stand-by time (when the mode switch, the compressor will OFF), the air
capacity keep to weak.
3. Power off by remote controlˈthen the indoor fan motor will OFF.
3.1.3 Compressor restart
It is set air capacity by remote control after the system warm start.
System will be based on the temperature to determine its ventilation.
Reference the control function in temperature area.
3.1.4 Defrosting operation
Fan motor is off after being low for 20 minutes.
The system received command from the outdoor unit communication I21=11 during low temperature
and defrosting in heat mode to control the air capacity, it is the same with through the heat exchange
temperature transducer go to warm start to control. (3-1-1).
After defrosting operation, if the compressor is on, the system will go to warm start to control the air
capacity. If compressor is off, the air capacity is weak.
3.2 Cool operation
When set the air capacity is high, middle and low which represents its air capacity separately.
When air capacity is running on automatically, it is based on temperature.
Refer to Temperature adjustment Functions. ˄reference 2-4-8˅
3.3 Dry operation
3.3.1 Compressor OFF and waiting for 3 minutes
When the compressor is OFF, the fan motor will stop.
It will switch to weak after wait for 3 minutes.
The compressor will change to ON after wait for 3 minutes, and it will in the on-control mode.

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3.3.2 Compressor ON
When the air capacity is set High, Middle and Low, the compressor will operate by the set mode.
When the air capacity is set auto fan, the air capacity will be adjusted by the temperature.
. Enhanced operationČ
Enhanced operation will continue for 15 minutes.
Enhanced operation will finish if the operation is off or after 15 minutes.
Enhanced operation will finish when the status be changed.
Enhanced operation will finish if the unit enters the status of “silence”, operates normally or on-timer
signal control.
In the auto mode, there are enhanced /silence function; the main unit operating is based on enhanced
cool /silence function in the cool mode; the main unit operated by the enhanced heat/silence function
in the heat mode; the main unit will operate is based on no-enhanced/silence function in the fan mode.
4.1 Enhanced heat
Modify the set temperature. It has temperature-adjustment function.
Air capacity will be automatic middle fan speed.
When operating for defrosting, outdoor unit will not receive the communication signal of enhanced
operation. After operation for defrosting, the system will operate enhanced function only in the
remaining time.
After enhanced operation continues for 15 minutes, compressor is forbidden to be OFF for 10 minutes.
(Except the error)
4.2 Enhanced Cool
Modify the set temperature. It has temperature-adjustment function.
The high air capacity will be set for hand controlling.

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After compressor starts, it’s not on the low load protection within 3 minutes.
4.3
ˊ
No enhanced function for fan and defrosting mode.
.Silence operationč
Send silence operation signal to outdoor unit.
5.1 Heating in the silence mode
When compressor is on, air capacity is SSLO.
When compressor is off, air capacity is SSLO within 20 seconds, and then it changes to be tenuity.
5.2 Cooling in the silence mode
Air capacity is SSLO.
5.3 No silence functions during dry operating and fan operating in the silence
mode.
.Fresh airĎ
After the system receives remote control command, the negative ion generator will be activated to emit
the negative ion if the fan motor is operating.
When the fan motor is OFF, the negative ion generator will OFF.
When the negative ion generator is OFF, if the fresh air mode is ON, the fan motor operating again and
the negative ion generator will ON automatically.
.Timer operatingď
Use the timer to time counting is according to the time difference between time clock and current time.
During timer operating, the timer indicator light will light.
7.1 Timer off
When the timer is off, the character display of the panel running status does not change, once the
timer time is time-up, its operating will OFF.
7.2Timer ON
When the timer is ON, the panel only displays the timer character, once the on-timer time, the system
will operate start by the set mode.

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7.3 Timer ON/OFF
The executing order is based on the direction from the board.
. Sleep operatingĐ
8.1 During cool/ dry operation, the fixed temperature will rise by 1ćafter it operates for 1 hour. After
another hour the temperature will rise by another 1 . After 6 hours, the unit is off.ć
8.2 During heat-making operation, the fixed temperature will rise by 2 after 1 hour. After another 2ć
hours the temperature will rise by 2 . The temperature will rise by 1 after three hours. After the lastćć
3 hours, the unit is off.
8.3 Indoor fan unit will be high fan before the unit is set for sleeping state. After it is set for sleeping
state, fan speed indoors will change into middle fan speed. If indoor fan unit is middle fan speed before
it is set for sleeping state, fan speed indoors will change into low fan after it is set for sleeping state. If
indoor unit is low fan before it is set for sleeping state, fan speed indoors will keep the same.
. Automatic operationđ
The automatic operation is divided into automation and full automation by use the variant selection
mode.
9.1 Automation operating mode:
Automation operating is on, MCU will select corresponding operation mode based on the room
temperature to preserve the set temperature (set temperature is 23 in the heat mode; it is 26 inćć
the cool mode).
For the first power on, if the indoor temperature T=23 the system will operate in the heat mode,ć
T>23 operating in the cool mode.ć
The system will perform the heat program in the heat mode (set temperature is 23 ), when systemć
temperature arrive at stop value of compressor, the compressor to off and waiting for 3 minutes; after
the compressor stop continuance for 15 minutes, if the system detected the ventilation temperature is
more than 23 , it will enter cool mode, or else it will continuously operate in the heat mode.ć
When enter the cool mode and the system operating in cool mode (set temperature 26 ), theć
compensation temperature contrast will be canceled automatically, when it arrive at the stop
temperature of the compressor, the compressor to off and wait for 3 minutes; after the compressor
stop continuously for 15 minutes, the system detected the ventilation temperature T=23 , then it wćill
enter heat mode and automatically add the compensation temperature. or else it will continuously
operate in the cool mode.

Haier air conditioner Edition:20070116
-20-
When the system switch from other mode to auto mode, if the operation status change (i.e. first
determine and then operation), it will stop for 3 minutes and then determine temperature based on the
indoor ventilation temperature.
9.2 Full-automation operation
After system is on and the operation mode will switches to auto mode, the system determine operating
mode by the difference between current set temperature and the room temperature, and then operate
in the determined mode. In the following selection condition, Tr indicate room temperatureˈTs indicate
set temperature.
In First enter auto mode, select operating mode as following condition:
Tr=Ts -3 select cool modeć
Tr˘Ts-3 select heat modeć
When system enter the auto mode, the operation mode will switch between cool and heat according to
change of the indoor temperature: if the unit operating in the cool mode, when system temperature
arrive at stop value of compressor, the compressor to off and stop continuously for 15 minutes, and
then to detect the room temperature, at this point, if Tr ˘Ts-3 , then the system enter the heat mode,ć
otherwise it will operate continuously in the cool mode; if the unit operating in the heat mode, when
system temperature arrive at stop value of compressor, the compressor to off and stop continuously
for 15 minutes, and then to detect the room temperature, at this point, if Tr˚Ts+3 , then the systemć
enter the cool mode, otherwise it will operate continuously in the heat mode.
This mode has timer and sleep function, if the system enter the cool mode, then enter the cool+ sleep
mode, if enter the heat mode then enter heat + sleep mode.
Select swing or sticking on one position for the fan blade, and fan speed including: low, middle, high
and auto fan, you can select any one of them without control.
Ē
. Running-in
In the Running-in mode the indication frequency is 58Hz, the air capacity is enhanced.
Running-in is off after 30 minutes. When the system received the remote control signal in the
running-in mode, the system will exit this mode.
No taking activities under low load protection.
Ēĉ
. Low load protection controlling
The standard of heat alternating temperature sensor
B destiny=3700 R (25 degrees) =10KO
When it operates for coolness making or defrosting, low load protection will be taken based on Heat
exchange temperature as the following picture shows
Controlling under low load protection
If selection model is GANGDA communication, the indoor unit have not this function.