Toyotomi MUL12- FWCA User manual

Service Manual
MODEL:
MUL FWCA Series

CONTENTS
PRODUCT ..................................................................................................................
1 MODELS LIST .......................................................................................................................
1.1 Outdoor Unit .................................................................................................................................................
1.2 Indoor Unit....................................................................................................................................................
2 NOMENCLATURE ...............................................................................................................
2.1 Nomenclature of Outdoor Unit ....................................................................................................................
2.2 Nomenclature of indoor unit .......................................................................................................................
3 FUNCTION .............................................................................................................................
4 PRODUCT DATA ..................................................................................................................
4.1 Product data of outdoor............................................................................................................................
4.2 Product data of indoor.................................................................................................................................
4.3 Working Temperature Range.....................................................................................................................
5 PIPING DIAGRAM ..............................................................................................................
CONTROL ................................................................................................................
1 OPERATION FLOWCHART ...............................................................................................
1.1 Cooling/Dehumidfying Operation ..............................................................................................................
1.2 Heating Operation......................................................................................................................................
2 MAIN LOGIC........................................................................................................................
2.1 Control Function of Outdoor Unit............................................................................................................
2.2 Protection Function .....................................................................................................................................
2.3 Control Function of Indoor Unit.................................................................................................................
3 REMOTE CONTROLLER ...................................................................................................
3.1 Wired Remote Controller ...........................................................................................................................
3.2 Wireless Remote Controller........................................................................................................................
INSTALLATION ......................................................................................................
1 PRECAUTIONS FOR INSTALLATION ...........................................................................
1.1 Precautions for Installation ........................................................................................................................
1.2 Key Points of Installation ............................................................................................................................
2 FLOW CHART OF INSTALLATION.................................................................................
3 OUTDOOR UNIT INSTALLATION...................................................................................
3.1 Before Installation ........................................................................................................................................
3.2 Installation Site.............................................................................................................................................
3.3 Caution for Installation................................................................................................................................
3.4 Dimension Data ...........................................................................................................................................
3.5 Installation Clearance Data.........................................................................................................................
4 INDOOR UNIT INSTALLATION........................................................................................
4.1 Installation of Duct Type..............................................................................................................................
4.2 Installation of Cassette Type........................................................................................................................
4.3 Installation of Floor Ceiling Type ...............................................................................................................
5 REFRIGERATION PIPING WORK ...................................................................................
5.1 Connection between Indoor and Outdoor Units........................................................................................
5.2 Refrigerant Charging and Trial Running .................................................................................................

6 ELECTRIC WIRING WORK...............................................................................................
6.1 Wiring Principle ...........................................................................................................................................
6.2 Electric Wiring Design .................................................................................................................................
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MAINTENANCE......................................................................................................
1 TROUBLE TABLE.................................................................................................................
1.1 Please check the following items before contact the maintenance serviceman.......................................
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1.3 Error description..........................................................................................................................................
2 FLOW CHART OF TROUBLESHOOTING .....................................................................
3 WIRING DIADRAM..............................................................................................................
3.1 Outdoor unit .................................................................................................................................................
3.2 Indoor unit ....................................................................................................................................................
4 DISASSEMBLY AND ASSEMBLY PROCEDURE OF MAIN PARTS............................
4.1 Outdoor Unit................................................................................................................................................
4.2 Indoor Unit....................................................................................................................................................
5 EXPLODED VIEWS AND PART LIST ...............................................................................
5.1 Outdoor Unit ................................................................................................................................................
5.2 Indoor Unit....................................................................................................................................................

1
PRODUCT

PR
O
D
UCT
1
.2 Indoor Un
i
t
1.2.2 Cassette type
U
nits
S
eries
M
odel
C
apac
i
t
y
R
ef
.
Power
Suppl
y
A
pp
earance
C
ooling
(
kW
)
H
eating
(
kW
)
Cassette
Type
Indoor Unit
MUL12- FWCA 3,5 3,85
R
41
0
A
220
~
240V
-
1Ph-50H
z
MUL18- FWCA 5
5.
5
0
MUL24- FWCA 7,1 8.0
0

3
PRODUCT
2 NOMENCLATURE
NO. Description Options
1Name Model
2Product Type
DTA: Duct type
FWCA: Cassette type
CON: Floor type
3Cooling Heating :
H: Heat pump
4Cooling Capacity 12 represents 12000Btu/h
1kW=3,412KBtu
5Series Series code
6Power Supply Voltage:
220-240V - 1Ph - 50Hz
7Refrigerant R410A
8Compressor Frequency DC inverter type

4
PRODUCT
3 FUNCTION
Function Duct type Cassette type Floor ceiling type
For Comfortable
Air Conditioning
Fan operation Mode ƔƔ Ɣ
Auto Swing Controller - ƔƔ
Timer Selector ƔƔ Ɣ
Auto Mode Operation ƔƔ Ɣ
Cool Mode Operation ƔƔ Ɣ
Heat Mode Operation ƔƔ Ɣ
Dry Mode Operation ƔƔ Ɣ
Fan Mode Operation ƔƔ Ɣ
Sleep mode setting ƔƔ Ɣ
Drain Pump ƔƔ -
For Flexible Control
Wired Controller ƔƔ Ɣ
Wiredless Remote Controller ƔƔ Ɣ
Ɣ+DYH)XQFWLRQV
- :No Functions

7
PRODUCT
4.2.2 Cassette type
Model Heat pump MUL12- FWCA MUL18- FWCA MUL24- FWCA
Capacity
Cooling kW 3.5 5 7.1
Heating kW 3.85 5.5 8
Power supply V-Ph-Hz 220~240-1-50 220~240-1-50 220~240-1-50
Motor power input kW 0.07 0.07 0.1
$LUÀRZYROXPH
m3/h 680 680 1180
CFM 400 400 694
Sound pressure level(H/L) dB(A) 42/38 42/38 45/41
Fan motor
Output kW 0.0385 0.0385 0.055
Running current A 0.374 0.374 0.535
Connecting
pipe
Gas inch ƎPP ƎĭPP ƎĭPP
Liquid inch ƎĭPP ƎĭPP ƎĭPP
Connection method Flare Connection Flare Connection Flare Connection
Drain pipe
External dia. mm 31 31 31
Thickness mm 3 3 3
Outline
Dimension
Body(W×D×H) mm 840×840×190 840×840×190 840×840×240
Panel(W×D×H) mm 950×950×60 950×950×60 950×950×60
Package
Dimension
Body(W×D×H) mm 960×960×257 960×960×257 960×960×310
Panel(W×D×H) mm 1040×1025×115 1040×1025×115 1040×1025×115
Net Weight
Body kg 25 25 30
Panel kg 6.5 6.5 6.5
Gross Weight
Body kg 33 33 38
Panel kg 10 10 10
Loading quantity
20'GP 72 72 72
40' GP 144 144 144
40' HQ 144 144 144

9
PRODUCT
Notes:
a. The rated cooling capacity data is measured under the following work condition: Indoor Temperature is
27ćDB, 1 9ćWB. Outdoor Temperature is 35ćDB.The rated heating capacity data is measured under the following
work condition: Indoor Temperature is 20ćDB. Outdoor Temperature is 7ćDB, 6ćWB.
b. The data will change with the change of products. Refer to those parameters listed on nameplate.
c. Noise was tested in semi-silenced room, so the actual noise value will be a little higher for change of ambient.
4.3 Working Temperature Range
Indoor side state Outdoor side stae
Dry bulb temp. ćWet bulb temp. ćDry bulb temp. ćWet bulb temp. ć
Rated Cooling 27 19 35 24
Max. cooling 32 23 48 26
Min. cooling 21 15 18 —
Rated Heating 20 15 7 6
Max. heating 27 — 24 18
Min. heating 20 15 ˉ15 ˉ16
Notes˖
a. The heating/cooling capacity and noise listed below are all measured before the shipment.
b. All parameters listed below are measured under the standard working conditions. If there is any change, the
parameters marked on the nameplate always prevail.
c. The heating capacity of the indoor unit just involves that of the heat pump but apart from that of the auxiliary
electric heater.

10
PRODUCT
5 PIPING DIAGRAM
Schematic Diagram of Multisplit Inverter Heat Pump
Schematic Diagram of Multisplit Inverter Heat Pump
The outdoor and indoor units start to work once the power is switched on. During the cooling operation, the low
temperature, low pressure refrigerant gas from the heat exchanger of each indoor unit gets together and then is taken
into the compressor to be compressed into high temperature, high pressure gas, which will soon go to the heat exchanger
of the outdoor unit to exchange heat with the outdoor air and then is turned into refrigerant liquid. After passing through
the throttling device, the temperature and pressure of the refrigerant liquid will further decrease and then go the main
valve. After that, it will be divided and go to the heat exchanger of each indoor unit to exchange heat with the air which
needs to be conditioned. Consequently, the refrigerant liquid become low temperature, low pressure refrigerant gas
again. Such a refrigeration cycle goes round and round to achieve the desired refrigeration purpose. During the heating
operation, the four-way valve is involved to make the refrigeration cycle run reversely. The refrigerant radiates heat in
the heat exchanger of the indoor unit (so do the electric heating devices) and absorb heat in the heat exchanger of the
outdoor unit for a heat pump heating cycle so as to achieve the desired heating purpose.
M

11
CONTROL
CONTROL

12
CONTROL
CONTROL
1 OPERATION FLOWCHART
Conn ecting To Power Supply
Initialization Of Bectronic
Expansion Valve
Start Indicating Light Is ON
Start/Stop
Is The Protecting
Is The Start Indicating
Display The Last Setting s Of
Air
Start Display:Flickering
Abno rmality Code Display
Press The Start/ Stop Switch
Volume:.Air Supply Direction
Start Indicating Light:OFF
Stop
Yes
Yes
Start
No
No
Start Indicating Light ON
Air Volume Setting Display
Displaying
Air Supply Direction Setting
Display Displaying
Temperature Setting Display
Displaying
Start Display:OFF
Abno rmal Mod e Di splay
Air Supply Or Temperature
Cooling Of Heatig?
Temperature
Adjustment
Heating OperationCooling Operation Air Supply
Operation
Air SupplyCoolin gH eating
A
Air Supply Blower:Stop
Electronic Expansion
Gu ide Louv er: Stop

13
CONTROL
1.1 Cooling/Dehumidfying Operation
Fan Motor: Operation
Electronic Expansion
Valve: Capacity Control
A
There Is Not
There Is
Yes
Yes
No
No
˄Go To The Previous Page˅
Electronic Expansion Valve: Close
Fan Motor:Stop
Temperature
Adjustment?
In The Process Of
Preventing Restart Operation?
(3 Minutes)
Guide Louver
Cooling Operation
Guide Louvers Swing

14
CONTROL
1.2 Heating Operation
Heating Operation
Guide Louver
Guide Louvers
Swing
In The Operation
Of Defrosting?
In The Process Of
Preventing Restart
Operation ? (3 Minutes )
Temperature
Adjustment ?
Fan Motor :
As Per Set Air Supply
Speed
In The Process Of
Preventing Cold Air ?
Electronic Expansion
Valve: Capacity Control
Fan Motor : Stop
Fan Motor : Stop
Electronic
Expansion Valve :
Close
Fan Motor : Stop
Electronic
Expansion Valve:
Defrosting Control
There Is
There Is Not
Yes
Yes
Yes
Yes
No
No
No
No
A

15
CONTROL
2 MAIN LOGIC
2.1 Control Function of Outdoor Unit
2.1.1 Cooling Mode
a. Cooling conditions and process:
If the compressor is in stop status and start the unit for cooling operation, when one of the indoor units reaches the
cooling operation condition, the unit start cooling operation; in this case, the electronic expansion valve, the outdoor fan
and the compressor start operation.
b. Stop in cooling operation
a) Compressor stops
The compressor stops gradually, the outdoor fan stops after 1min.
b) Some of the indoor units reach the stop condition (the compressor does not stop) The compressor operates
according to the required frequency. For the indoor unit with no requirement, the corresponding electronic expansion
valve is closed to 0P.
c. Cooling mode transfers to heating mode
When the unit transfers to heating mode, the 4-way valve is energized after the compressor runs for 40s. The other
disposals are the same as stopping in cooling mode.
d. 4-way valve:
In this mode, the 4-way valve is closed.
e. Outdoor fan control in cooling mode
The outdoor fan starts before 5s of the starting of compressor. The outdoor fan will run in high speed for 3min
after starting and then it will run in set speed.
The fan shall run at every speed for at least 80s. (When the quantity of running indoor unit is changed, the unit
will enter the control described in 1.3.5.1 and 1.3.5.2); When the compressor stops, the outdoor fan runs at present speed
and stops after 1min.
2.1.2 Dry Mode
a. The dry conditions and process are the same as those in cooling mode;
b. The status of 4-way valve: closed;
c. The temperature setting range: 16 ~ 30ć;
d. Protection function: the same as those in cooling mode;
e. In dry mode, the maximum value A of the capacity requirement percentage of single unit is 90% of that in
cooling mode. The open condition of the electronic expansion valve, outdoor fan and compressor is the same as those in
cooling mode.
2.1.3 Heating Mode
a. Heating conditions and process: When one of the indoor units reaches the heating operation condition, the unit
starts heating operation.
b. Stop in heating operation:
a) When all the indoor units reach the stop condition, the compressor stops and the outdoor fan stops after 1min;
b) Some of the indoor units reach the stop condition The compressor reduces the frequency immediately and
operates according to the required frequency;
c) Heating mode transfers to cooling mode(dry mode), fan mode
The compressor stops;
The outdoor fan stops after 1min;
The status of 4-way valve: energized;
c. Outdoor fan control in heating mode
The outdoor fan starts before 5s of the starting of compressor and then it will run in high speed for 40s; The fan
shall run at every speed for at least 80s; When the compressor stops, the outdoor fan stops after 1min.
d. Defrosting function
When the defrosting condition is met, the compressor stops; the electronic expansion valve of all indoor units open
in big angle; the outdoor fan stops after the stop of the 4-way valve, meanwhile, the 4-way valve reverses the direction;
after the 4-way valve reverses the direction, the compressor starts; then begin to calculate the time of defrosting, the
frequency of the compressor rises to reach the defrosting frequency.
e. Oil-returned control in heating mode
a) Oil-returned condition
The whole unit is operating in low frequency for a long time
b) Oil-returned process in heating mode
The indoor unit displays “H1”
F2LOUHWXUQHG¿QLVKHGFRQGLWLRQLQKHDWLQJPRGH
The duration reaches 5min

16
CONTROL
2.1.4 Fan Mode
The compressor, the outdoor fan and the 4-way valve are closed; temperature setting range is 16 30ć.
2.2 Protection Function
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When the setting mode is different of different indoor unit, the unit runs in below status:
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E)DQPRGHLVLQFRQÀLFWZLWKKHDWLQJPRGHDQGWKHKHDWLQJPRGHLVWKHEDVLFPRGH1RPDWWHUZKLFKLQGRRUXQLW
RSHUDWHV¿UVWWKHXQLWZLOOUXQLQKHDWLQJPRGH
2.2.2 Overload Protection Function
When the tube temperature is a little low, the compressor raises the operation frequency; when the tube
temperature is a little high, the compressor frequency is restricted or lows down the operation frequency; when the tube
temperature is too high, the compressor protection stops running. If the discharge temperature protection continuously
appears for 6 times, the compressor can’t resume running. The compressor can resume running after cutting off the
power and then putting through the power. (if the running time of the compressor is longer than 7min, the protection
times record will be cleared)
2.2.3 Discharge Protection Function
When the discharge temperature is a little low, the compressor raises the operation frequency; when the discharge
temperature is a little high, the compressor frequency is restricted or lows down the operation frequency; when the
discharge temperature is too high, the compressor protection stops running. If the discharge temperature protection
continuously appears for 6 times, the compressor can’t resume running. The compressor can resume running after
cutting off the power and then putting through the power. (if the running time of the compressor is longer than 7min, the
protection times record will be cleared)
2.2.4 Communication malfunction
Detection of the quantity of installed indoor units: After 3min of energizing, if the outdoor unit does not receive
the communication data of certain indoor unit, the outdoor unit will judge that indoor unit is not installed and will treat
it as it is not installed. If the outdoor unit receives the communication data of that indoor unit later, the outdoor unit will
treat that unit as it is installed.
2.2.5 Compressor high-pressure protection
a. When the high-pressure switch is detected cut off for 3s continuously, the compressor will enter high-pressure
protection as it stops when reaching set temperature. Meanwhile, the outdoor unit will send the signal of “high-pressure
protection” to the indoor units;
b. After the appearance of high-pressure protection, when the high-pressure switch is detected closed for 6s
continuously twice an hour, the compressor can resume running only after cutting off the power and then putting
through the power.
2.2.6 Compressor low-pressure protection
a. Low Pressure Protection for Shutdown
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a low pressure protection signal will be send out.
If it is detected continuously for three seconds that the low pressure protection switch is opened after the
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pressure protection occurs twice in one hour, then it becomes unrecoverable and has to be recovered by powering the
outdoor unit again.
b. Low Pressure Protection during the Operation
a) When it is detected continuously for three seconds that the low pressure protection switch is opened, then the
whole unit should be shut off and a low pressure protection signal should be sent to the indoor unit.
b) On condition that a low pressure protection error occurs and the whole unit has stopped for more than three
minutes and it is detected continuously for six seconds that the low pressure protection switch is closed, then this error
can be eliminated. However, if the low pressure protection occurs twice in one hour, then it has to eliminate the error by
powering the outdoor unit again.

17
CONTROL
2.2.7 Compressor overload protection
If the compressor overload switch is detected having movement, the indoor unit will display the corresponding
malfunction as it stops when the indoor temperature reaching set temperature. When the compressor stops for more than
3min and the compressor overload switch is reset, the unit will resume operation status automatically. If the protection
appears for more than 6 times (if the running time of the compressor is longer than 30min, the protection times record
will be cleared), the unit can not resume operation status automatically, but can resume running only after cutting off the
power and then putting through the power.
2.2.8 Drive Error
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mode, and they will go to the piping test through the preset mode after they has run at the high fan speed for six minutes.
2.2.9 Refrigerant Recovery
The refrigerant can be recovered from either the indoor unit or the outdoor unit.
From the outdoor unit: it is available to recover the refrigerant from the outdoor unit by pressing “SW3”for a long
time period.
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minute to go the refrigerant recovery mode by pressing three times the “LIGHT” button on the wireless controller in
three seconds with “F0”displayed.
How to quit the refrigerant recovery:
When the refrigerant recovery has started, it will quit when the “SW3” is pressed down for a long time period or
there is a signal from the wireless controller or it has run for ten minutes.
2.2.10 Forcible Defrosting
How to activate this function: when indoor unit runs under the heating mode and at 16 ć, it will activate the
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+RZWRTXLWWKLVIXQFWLRQWKHIXQFWLRQZLOOTXLWZKHQWKHPRGHRILQGRRUXQLWVFRQÀLFWV
2.2.11 Switchover of the Defrosting Modes
Under the unit is under the “Off” status, if “H1” is not displayed on the wireless controller, then the unit will go to
the defrosting mode 1 when it is turned on through the wireless controller.
Under the unit is under the “Off” status, if “H1” is displayed on the wireless controller, the unit will go the
defrosting mode 2 when it is turned on through the wireless controller.
Under the unit is under the “Off” status, it is available to switch over the defrosting mode 1 and defrosting mode 2
by pressing the “Mode” and “Blow” buttons simultaneously.
2.3 Control Function of Indoor Unit
2.3.1 Running Mode
1.COOL 2.DRY 3.HEAT 4.AUTO 5 FAN
2.3.2 Basic Functions of the System
a. COOL Mode
Under this mode, the fan and swing function goes as the set conditions, and the set temperature range is
16ć~30ć.
b. DRY Mode
Under this mode, the fan will run at the low speed and the swing function is performed under the set conditions.
The set temperature range is 16~30ć.
c. FAN Mode
Under this mode, only the fan of the indoor unit runs. And if the auto speed is set, the fan will run under the same
condition as the COOL mode.
d. HEAT Mode
a) Under this mode, the set temperature rang is 16ć~30ć.
b) The defrosting symbol “H1” will be displayed when the defrosting signal is received from the outdoor unit.
e. AUTO Mode
a) When the ambient temperature is higher than 25ć, the unit will run as the COOL mode.
b) For the cooling and heating unit, if the ambient temperature is or lower than2 0ć(72 ), the unit will run as
the HEAT mode.
c) When the indoor ambient temperature is higher than 20ćbut lower than 25ć, the unit which starts to work
under the AUTO or DRY mode will shift to the FAN mode, while the unit which starts to work under other mode will

18
CONTROL
keep the current running mode.
f. 0RGH&RQÀLFW
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show the error code “E7”.
2.3.3 Other Control
a. Beeper Control
When the controller is powered on or it receives a valid either press button signal or remote control signal, the
beeper will utter a warning tone.
b. Auto Speed Control
Under the HEAT mode:
If the ambient temperature is equal or higher than the set temperature, the fan will run at the low speed;
If the ambient temperature minus 3ćis equal or lower than the set temperature, the fan will run at the medium
speed;
If the ambient temperature minus 3ćis lower than the set temperature minus 3ć, the fan will run at the high
speed.
Under the COOL mode:
If the ambient temperature is equal to or lower than the set temperature, the fan will run at the low speed;
If the ambient temperature is between the set temperature and the set temperature minus 3ć, the fan will run at
the medium speed;
If the ambient temperature is higher than the set temperature plus 3ć, the fan will run at the high speed.
Under the FAN mode:
The fan will run at the medium speed constantly.
Once the fan starts, its speed can not be changed unit it has run for at least 30 seconds at the currently set speed.
c. AUTO Press Button
The whole unit will run under the AUTO mode by pressing this button when the unit is off. In this condition, the
fan of the indoor unit will run at the auto speed with the swing function activated. When the unit is on, it will be turned
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d. Sleep
a) Under this mode, the proper sleep curve will be adopted in accordance with different set temperatures.
b) Sleep 1
Under the COOL mode or the DRY mode, the temperature will go up by 1ćafter one hour and by another 1ć
after another hour, after that, the temperature will be kept on.
Under the HEAT mode, the temperature will go down by 1 ćafter one hour and by another 1 ćafter another
hour, after that, the temperature will be kept on.
c) Sleep 2
Sleep Curve under the COOL mode
0 1 2 3 4 5 6 7 8 9 10 11 12
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Sleep Curve under the HEAT mode

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CONTROL
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Time/(Hour)
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How to set the sleep 3 curve:
1)When the sleep 3 mode is selected, press the “Timer” button to go to the setting status with “1 Hour” displayed
and the corresponding temperature of the sleep curve set last time displayed at the temperature area.
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3)Press the “Timer” button to increase the time by one hour, and the sleep curve temperature set last time will be
displayed at the temperature area.
4)Repeat the step 2 and step 3 until the temperature of eight hours has been set.
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e. Quiet
Quite Function: It is divided into the “Quiet” mode and “Auto Quiet” mode.

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CONTROL
a) Under the “Quiet” mode, the low fan speed will be kept and is unchangeable.
b) Under the “Auto Quiet” mode, the fan speed changes in accordance with the difference of the indoor ambient
temperature and the set temperature.
f. Timer
a)Timer On
When the unit is powered on but in the idle condition, it is available to set when to start the unit. Then, when the
unit starts, it will run as the previously set mod. The set range of the timer is 0.5 24 hours with a interval of 0.5 hour.
b) Timer Off
When the unit is on, it is available to set when to stop the unit. The set range of timer is 0.5 24 hours with a
interval of 0.5 hour.
g. Memory
a) Memorizing Objects: modes (AUTO, COO, DRY, FAN, HEAT), swing, set temperature, set fan speed, etc.
b) When the indoor unit works without the wired controller, it will resume the working condition as the power
failure occurs after it is powered on again. When the indoor unit is with the wired controller, it is available to set the
memory function by pressing the corresponding buttons of the wired controller.
c) When the indoor unit works without the wired controller, if the timer is not set for the last remote control
instruction, the system will memorize this last instruction and works following it ; if the timer is set, it will be canceled
as the power failure occurs and will have to be reset.
d) When the indoor unit works with the wired controller, it will wok as the message sent by the wired controller
after it is powered on again.
h. Forcible Defrosting
When the unit is on and runs under the HEAT mode and at 16 ćset temperature, the indoor unit will go to the
forcible defrosting by pressing the “+”and“-”buttons alternatively on the wireless controller for five seconds and
meanwhile a forcible defrosting signal will be sent to the outdoor unit.
When the indoor unit receives a forcible defrosting signal from the outdoor unit, it will quit the forcible defrosting
setting and cease to sending the forcible defrosting single to the outdoor unit.
i. Selection of the Indoor Temperature Sensor
a)For the duct type indoor unit: Under the COOL, HEAT, DRY, or FAN mode, the return air temperature sensor is
adopted; while under the HEAT mode, it is the receiver temperature sensor.
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ambient temperature sensor can be set in the following four ways:
ķ01:The indoor temperature sensor is set for the return air.
ĸ02:The indoor temperature sensor is set for the wired controller.
Ĺ03:The indoor temperature sensor is set for the wired controller under the HEAT mode, and for the return air
under any other mode.
ĺ04:The indoor temperature sensor is set for the return air under the HEAT mode, and for the wired controller
under any other mode.
c) Setting of the Ambient Temperature Sensor of the New Screen-Touch Wired Controller
When the unit is off, it is available to go to the debugging status by pressing the “Function” and “Timer” buttons
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The third one is the default code. The setting of the ambient temperature sensor of the wired controller should be
memorized.
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button press within 20 seconds, then the system will quit the setting and go to the normal “Off” status but with the
setting still saved.
j. Switchover of the Defrosting Mode
On condition that the unit is off, if “H1” is not displayed on the wireless controller, then the unit will go to the
setting status of the “Defrosting Mode 1”as it is turned on through the wired controller. Then, once the indoor unit
receives this signal, it will soon send it to the outdoor unit. In contract, if “H1”is displayed, the unit will go the setting
status of the “Defrosting Mode 2”, and the indoor unit also will send this signal to the outdoor unit as soon as it receives
it.
On condition that the unit is off, it is available to switch over the “Defrosting Mode 1” and “Defrosting Mode 2”
by pressing the “MODE” and “BLOW” buttons simultaneously.