Toyotomi TAN-A20EW User manual

CONTENTS
SPECIFICATION....................................................................1
FUNCTIONS ..........................................................................7
SERVICE FUNCTION EXPLANATION ..................................9
OPERATION DETAILS.........................................................10
TROUBLESHOOTING GUIDE.............................................19
PERFORMANCE CURVE DIAGRAM ..................................27
SCHEMATIC DIAGRAM AND
THERMISTOR RESISTANCE CHART.................................
ELECTRIC CIRCUIT DIAGRAM ..........................................
EXPLODED VIEW (INDOOR UNIT) ....................................
EXPLODED VIEW (OUTDOOR UNIT) ................................
PARTS LIST (INDOOR UNIT)..............................................
PARTS LIST (OUTDOOR UNIT)..........................................
SERVICE MANUAL
ROOM AIR CONDITIONER
TAN/TAG-A20EW
TAN/TAG-A28EW
TAN/TAG-A32EW

SPECIFICATION
– 1 –
TAN/TAG-A20EW
Unit
BTU/hCooling Capacity
INDOOR OUTDOOR
–
BTU/hHeating Capacity –
L/h
phase
Moisture Removal –
Power source
Single
V230
Hz 50
OUTLET
Airflow Method
SIDE VIEW TOP VIEW
INTAKE
m/min
Air circulation (at High) Cooling ;
Heating ;
W
Electrical Data
Input
Running Current
Starting Current
Inner diameter
Length
Cooling ;
Heating ; –
–
ACooling ;
Heating ; –
–
A
inch
Piping Connection Port (Flare piping) L L
inch G G
inch
Pipe Size (Flare piping) inch
mm
Drain hose
Length
Height
Width
Depth
Number of core-wire
Power Cord
–
m–
m–
core-wire/ 1 mm –
mm
Dimensions mm
mm
kg
Net Weight
3
2
; Half Union 1/4''
; Half Union 3/8''
L (liquid side) ; 1/4''
G (gas side) ; 3/8''
; 2-way valve 1/4''
; 3-way valve 3/8''
L (liquid side) ; 1/4''
G (gas side) ; 3/8''
TAN-A20EW TAG-A20EW
7,700
8,800
1.4
18
6.5
7.0
750
710
3.5
3.4
14
0.7
1.5
265
795
175
7.2
490
640
210
24

SPECIFICATION
– 2 –
Unit
Air Circulation
INDOOR OUTDOOR
Cross-flow Fan Propeller Fan
18 15
Induction (4-pole) Induction (6-pole)
W
Heat Exchanger 18.1FPI 19.5 FPI
Capillary Tube
Plate fin configuration,forced draft
Refrigerant Control Device g (oz)
Refrigerant (R410A)
–700(24.7)
–
OHR
–
Thermostat
Protection Device
Air Filter
Parts Provided
Electronic Control
Type
Motor Type
Rated Output
–
Mold-proof –
Specifications are subject to change without notice.
1 Mounting plate
2 Remote controller
3 Battery (2 pcs.)
4 Remote controller holder
5 Screw cap (2 pcs.)
6 Drain elbow
Timer –
Real time dual ON/OFF
7-hour OFF
TAN-A20EW TAG-A20EW

SPECIFICATION
– 3 –
TAN/TAG-A28EW
Unit
BTU/hCooling Capacity
INDOOR OUTDOOR
–
BTU/hHeating Capacity –10,500
L/h
phase
Moisture Removal –
Power source
Single
V230
Hz 50
OUTLET
Airflow Method
TOP VIEW
INTAKE
m/min
Air circulation (at High) Cooling ;
Heating ;
W
Electrical Data
Input
Running Current
Starting Current
Inner diameter
Length
Cooling ; –
–
8.0
820
840
3.6
3.7
7.0
Heating ;
ACooling ; –
–
Heating ;
A
inch
Piping Connection Port (Flare piping) L L
inch G G
inch
Pipe Size (Flare piping) inch
mm
Drain hose
Length
Height
Width
Depth
Number of core-wire
Power Cord
–
m–
m–
core-wire/ 1 mm –
mm
Dimensions mm
mm
kg
Net Weight
3
2
; Half Union 1/4''
; Half Union 3/8''
L (liquid side) ; 1/4''
G (gas side) ; 3/8''
; 2-way valve 1/4''
; 3-way valve 3/8''
L (liquid side) ; 1/4''
G (gas side) ; 3/8''
9,000
1.6
22
14
0.7
1.5
265
795
175
7.2
545
710
255
29
SIDE VIEW
TAN-A28EW TAG-A28EW

SPECIFICATION
– 4 –
Unit
Air Circulation
INDOOR OUTDOOR
Cross-flow Fan Propeller Fan
18 20
Induction (4-pole) Induction (6-pole)
W
Heat Exchanger 18.1FPI 19.5FPI
Capillary Tube
Plate fin configuration,forced draft
Refrigerant Control Device g (oz)
Refrigerant (R410A)
–830(29.3)
–
OLR(INNER)
–
Thermostat
Protection Device
Air Filter
Parts Provided
Electronic Control
Type
Motor Type
Rated Output
–
Mold-proof –
Specifications are subject to change without notice.
1 Mounting plate
2 Remote controller
3 Battery (2 pcs.)
4 Remote controller holder
5 Screw cap (2 pcs.)
6 Drain elbow
Timer –
Real time dual ON/OFF
7-hour OFF
TAN-A28EW TAG-A28EW

SPECIFICATION
– 5 –
TAN/TAG-A32EW
Unit
BTU/hCooling Capacity
INDOOR OUTDOOR
–
BTU/hHeating Capacity –13,500
L/h
phase
Moisture Removal –
Power source
Single
V230
Hz 50
OUTLET
Airflow Method
TOP VIEW
INTAKE
m/min
Air circulation (at High) Cooling ;
Heating ;
W
Electrical Data
Input
Running Current
Starting Current
Inner diameter
Length
Cooling ; –
–
Heating ;
ACooling ; –
–
Heating ;
A
inch
Piping Connection Port (Flare piping) L L
inch G G
inch
Pipe Size (Flare piping) inch
mm
Drain hose
Length
Height
Width
Depth
Number of core-wire
Power Cord
–
m–
m–
core-wire/ 1 mm –
mm
Dimensions mm
mm
kg
Net Weight
3
2
; Half Union 1/4''
; Half Union 3/8''
L (liquid side) ; 1/4''
G (gas side) ; 3/8''
; 2-way valve 1/4''
; 3-way valve 3/8''
L (liquid side) ; 1/4''
G (gas side) ; 3/8''
11,500
2.1
27
8.0
9.7
1,050
1,010
4.7
4.5
14
0.7
1.5
265
795
182
8.3
545
710
255
33
SIDE VIEW
TAN-A32EW TAG-A32EW

SPECIFICATION
– 6 –
Unit
Air Circulation
INDOOR OUTDOOR
Cross-flow Fan Propeller Fan
22 20
Induction (4-pole) Induction (6-pole)
W
Heat Exchanger 19.5FPI 19.5 FPI
Capillary Tube
Plate fin configuration,forced draft
Refrigerant Control Device g (oz)
Refrigerant (R410A)
–1,100(38.8)
–
OLR(INNER)
–
Thermostat
Protection Device
Air Filter
Parts Provided
Electronic Control
Type
Motor Type
Rated Output
–
Mold-proof –
Specifications are subject to change without notice.
1 Mounting plate
2 Remote controller
3 Battery (2 pcs.)
4 Remote controller holder
5 Screw cap (2 pcs.)
6 Drain elbow
Timer –
Real time dual ON/OFF
7-hour OFF
TAN-A32EW TAG-A32EW

– 7 –
REMOTE-CONTROL TRANSMITTER
ON/OFF
Operation mode selection
AUTOMATIC
COOL
DRY
HEAT
CIRCULATER
Air flow selection
AUTOMATIC
HIGH
MEDIUM
LOW
Room temperature setting
16°C〜30°C
Timer operation selection
CONTINUOUS operation
OFF
ON
Sleep
Timer / time setting
Operation stops at the set time(OFF timer)
Operation starts at the set time(ON timer)
0.5〜7.0hours(Sleep timer)
Air flow direction control
Auto angle selection
Auto swing mode
Manual mode
INDOOR UNIT
Sensing the room temperature
Room temperature sensor (thermistor)
Time delay safety control
Restarting is inhibited for approximately
3 minutes.
Indoor fan speed control
High, Med, Low
Operation indication lamps (LED)
(GREEN).......Light up in operation
(YELLOW) .... Timer in operation
(GREEN).......Outdoor unit operate
Dry operation mode
Intermittent operation of fan at low speed.
Room temperature control
Maintains the room temperature in
accordance with the setting temperature.
Deice (defrost) control
Deicing operation automatically starts
when the heating efficiency is declined by
the ice formed in the outdoor unit.
After deicing operation, heating operation
automatically starts with “Hot start
function.”
FUNCTIONS
SET
ON
APM
CLOCK
OFF
℃
LH
M
AUTO
MODE
FAN
TIMEADJ
ON OFF
LOUVER

– 8 –
Hot-start control (heating)
The indoor fan stops until the evaporator
piping temperature will be reached.
Overload protection
Anti-freezing control for the
evaporator
Compressor will be stopped when the
evapolator’s piping temperature is below
2°C for one minute.
Compressor will be restarted when the
evaporator’s piping temperature is above
2°C.
Airflow direction control
When ON/OFF BUTTON is pressed, the
vertical louver will move to the adequate
positions for each operation automatically.
Manual operation.
The louver starts vertical swing with a
push of the LOUVER BUTTON. Push the
LOUVER BUTTON once again to stop
the louver at the desired position while
swinging.
Auto recovery function
If there is any power failure during
operation, operation status before power
failure is memorized.
3〜4 minutes after power recovery, the
unit restarts automatically with previous
operation status memorized.
(3〜4 minutes is protective time for
compressor.)
Attention
Because of Auto recovery function, if
shutting off the power supply during
operation, the unit may restart
irrespective your intention when turning
on the power supply next time.
If the unit is not to be used for a long
time, shut off the power supply after
terminating all operation with remote
controller.
OUTDOOR UNIT
Compressor overload protector
When overheating of the compressor is
detected,protector ★1 stops the
operation of the compressor.
When high current supplied to the
compressor is detected, the main
controller stops the operaiton of outdoor
unit including compressor
3 min. forced operation control
Once the compressor is activated, it does
not stop for 3 minutes.
In case of termination of this operation,
push the ON/OFF button on remote
controller.
FUNCTIONS
★1OHR(Over Heat Relay) ••••
INNER PROTECTOR •••••
TAN/TAG-A20EW
TAN/TAG-A28EW, TAN/TAG-A32EW

– 9 –
Emergency Operation
•Use this operation only when the remote controller is out of order or lost.
•When the emergency operation switch is pressed, beep starts once, which
means the start of this operation.
•In this operation, the system automatically selects the operation modes, cooling
(or heating when available) according to the room temperature, as follows.
•It is not possible to operate in dry mode.
Test Operation
Test operation switch is same as emergency one.
•Use this operation only for testing the performance of the machine in the condition
where the room temperature is less than 16°C.
•Continue to press the test operation switch for more than 5 seconds.
After you hear twice beep, release your finger from the switch: the cooling
operation starts with the air flow speed “HI.”
•If the test operation switch is pressed more than 10 seconds, it doesn’t work.
•After 30 minutes, test operation ends automatically.
When two indoor units used in the same room, interference of the signals may happen. To avoid this, alternative
signal model B can be selected by the following. (Ex-factory setting is mode A)
•Remote controller side : Have “J1” on the PC board short-circuited by soldering.
•Indoor unit side : Cut “R7” on the PC board.(7K, 9K, 12Kmodel)
(Each Operations Details)
EMERGENCY AND TEST OPERATION
SERVICE FUNCTION EXPLANATION
Beep
Twice beep
<Remote control unit> <Indoor unit>
Receive
Ex-factory setting (Mode A) Ex-factory setting (Mode A)
Cut R7 on the PC board (Mode B)
Have "J1"on the PC
board short-circuited
by soldering (Mode B)
Receive
Not receive
Not receive
ON
APM
CLOCK
OFF
℃
LH
M
AUTO
℃
ON
APM
CLOCK
OFF
℃
LH
M
AUTO
℃
J1
Soldering
J1
Temperature
ABOVE 23℃
BELOW 23℃
COOLING
HEATING
26℃
23℃
CONTINUOUS
CONTINUOUS
AUTOMATIC
AUTOMATIC
Operation
mode Designated temperature Timer mode Air flow
HOW TO RELEASE EMERGENCY AND TEST OPERATION
INTERFERENCE PREVENTION OF SIGNALS FROM THE REMOTE CONTROLLERS
•In case of releasing during those operations, you can either push emergency operation switch once more or
apply operation using remote control.
You will hear a beep sound and emergency/ test operation is released.
•If you release the operation by remote control, operation will continue as setting of the remote control
automatically.

– 10 –
OPERATION DETAILS
TIMER OPERATION
ON Timer operation
•Press the ON/OFF switch.
•Set the “ON Time” : Press the “TIMEADJ” button twice.
Adjust the time with the “ , ” button.
Press the “TIME ADJ” button twice.The setting of “ON Time” is completed and the present time appears on the LCD.
•Set the “ON Timer” : Press the Timer fixing button “ON”.
OFF Timer operation
•Press the ON/OFF switch.
•Set the “OFF Time” : Press the “TIMEADJ” button 3 times.
Adjust the time with the “ , ” button.
Press the “TIME ADJ” button once.The setting of “OFF Time” is completed and the present time appears on the LCD.
•Set the “OFF Timer” : Press the Timer fixing button “OFF”.
Sleep Timer operation
•Press the “SLEEP” button during the operation.
•Set the operating period by pressing the “SLEEP” button until the period appears on the LCD.
Timer Cancellation
•ON/OFF Timer : Press the Timer fixing button “ON”(On Timer) and/or “OFF”(Off Timer) once again.
•Sleep Timer : Press the “SLEEP” button until the operating period on the LCD disappears.
AIRFLOW DIRECTION CONTROL
Vertical adjustment
When ON/OFF switch is pressed, the vertical louver will move to the adequate positions for each operation
automatically.
Swing of air flow
If air flow direction switch is pressed once, the vertical louver will move within the range of figures.
Fixing the flow direction
If air flow direction switch is pressed again, the vertical louver will be fixed and that position is memorized.
From the next operation the louver will be set at previous position automatically.
Notes :
•In Swing Mode, the louver automatically moves up and down within the certain range, as the illustration below.
•There is two different ranges of louver swinging; one is of cooling & dry mode operation and the other is of
heating operation.
Level
Approx. 10
degrees
Level
Approx. 60
degrees
Level
Approx. 10
degrees
Approx. 45
degrees
Level
Approx. 10
degrees
Approx. 60
de
g
rees
During Cooling,
Dry Operation During Heating Operation

– 11 –
COOLING MODE OPERATION
•Compressor stops when the room temperature is cooled down to the designated temperature.
•Compressor restarts when room temperature is raised to +0.7°C higher than the designated temperature.
OPERATION DETAILS
ROOM TEMP.
DESIGNATED TEMP.
INDOOR FAN ON
ON OFF ON ON ON ON
OFF
COMPRESSOR
0.7
OFF OFF
TIME DELAY SAFETY CONTROL FUNCTION - FOR PROTECTION OF COMPRESSOR
•Compressor will not restart, in any operation modes, for 3 minutes after its stop.
•Compressor does not stop during the first 3 minutes of its operation even if the room temperature reaches to
the designated temperature, except changing setting temperature.

– 12 –
•Fan speed control when “Auto” is selected in fan mode
When “Auto” is selected,the fan speed is automatically controlled according to the difference between the room
and designated temperatures.
ROOM TEMP.
DESIGNATED TEMP.
Hi Me
Lo Hi
INDOOR FAN
＋3℃
＋1℃
＋3.7℃
＋1.7℃
＋0.7℃
Me
• Method of anti-freezing control of heat-exchanger(indoor)
When the sensor(heat-exchanger) detects the temperature below 2°C for the duration of one minute,the
compressor stops the operation.
After that,the compressor will automatically resume the operation
when the sensor(heat-exchanger) detects the temperature 2°C and above.
TEMPERATURE,
INDOOR HEAT
EXCHANGER
ON ON ON
OFF
COMPRESSOR
2℃
OFF
3min1min
OPERATION DETAILS

– 13 –
DESIGNATED TEMP.
(super low)
10min. 6min.
(super low) (super low) (super low) (super low)
INDOOR FAN
COMPRESSOR
0.7
2.0
ON
OFF
ON
ON OFF
OFF
OFF
ON
ONON
ON OFF
OFF OFF
10min. 6min. 3min.
DRY MODE OPERATION
1. When the room temperature is +2°C (or more) higher than designated temperature, compressor and indoor
fan operate.
2. When the room temperature has been cooled to the temperature +2°C higher than the designated, the
compressor and indoor fan start intermittent operation, ON (for 10 min.) and OFF (for 6 min.) by turns.
The air flow speed of indoor fan is super low.
3. When the room temperature is cooled to designated temperature, compressor and indoor fan stop.
The indoor fan restarts at the air flow speed of super low, after 3 minutes the compressor stops.
4. When the room temperature is raised to +0.7°C higher than the designated temperature, the intermittent
operation above #2 starts.
5. When operating in #2 above, if the room temperature becomes +2.7°C higher than the designated, the
operation #1 above starts.
OPERATION DETAILS

– 14 –
0.7℃
6℃
Designated
Temperature
Room
Temperature
Max.
4 min.
★
INDOOR FAN Stop Super
low Low Designated by remote controller
★: In maximum 4 minutes,the operation proceed to the next steps when the heat
exchanger is not warmed up to the reference temperature shown above.
Max.
4 min.
★
ON
ON ON OFF OFF OFF ON
OFF
COMPRESSOR
HEATING MODE OPERATION
• When room temperature is raised to +6°C higher than the designated temperature, compressor stops.
• When room temperature gets less than +5.3°C higher than the designated temperature, compressor turns on.
• At the start of heating operation, if the room temperature is less than +18°C, additional +1°C is set to the
temperature designated by the remote controller. (Canceled when the compressor first stops.)
• Hot Start Function
To prevent the unpleasant cold air to flow, the air flow speed is determined as shown below according to the
temperature of the indoor heat exchanger.
Temperature,
indoor heat
exchanger 38℃
23℃
44℃
INDOOR FAN Stop Super
low Low Designated by remote controller
OPERATION DETAILS

– 15 –
• Method of overload control by checking the temperature of heat-exchanger(indoor)
ON ON ON
OFF
OUTDOOR FAN
TAN/TAG-A20EW
TAN/TAG-A28EW
T1※
57℃
T2
54℃
T2※
OFF
T1※
10sec
TAN/TAG-A32EW 67℃ 64℃
OPERATION DETAILS
•Fan speed control when “Auto” is selected in fan mode
When “Auto” is selected,the fan speed is automatically controlled according to the difference between the room
and designated temp.+4°C.
ROOM TEMP.
DESIGNATED TEMP.+6℃
Hi Me
Lo Super low Lo Hi
INDOOR FAN
−1℃
−3℃
−0.7℃
−1.7℃
−3.7℃
Me

– 16 –
OPERATION DETAILS
• Method of overload control by checking the operating current
ON ON ON
OFF
OUTDOOR FAN
CURRENT
I1
3.6A
3.7A
4.9A
I2
3.2A
3.3A
4.5A
I2※
OFF
I1※
※ TAN/TAG-A20EW
TAN/TAG-A28EW
TAN/TAG-A32EW

– 17 –
Condition(a) Condition(b)
TAN/TAG-A20EW 3.6A (or 4.1Aonce in four defrosting operation) 3.2A
TAN/TAG-A28EW 3.2A (or 5.1Aonce in four defrosting operation) 3.3A
TAN/TAG-A32EW 3.4A (or 7.0Aonce in four defrosting operation) 5.0A
Condition(a) Condition(b)
TAN/TAG-A20EW 4min 2min
TAN/TAG-A28EW 4min 2min
TAN/TAG-A32EW 4min 2min
Defrosting operation is called off after 9 minutes at maximum, even if the current value does not reach
to the above.
DEFROSTING OPERATION
•Defrosting operation is controlled by room temperature, temperature of indoor heat exchanger and timer switch.
•Defrosting operation starts when
(a) 50 minutes pass after the start of heating operation or after the completion of previous defrosting
operation, and while compressor is running, the temperature of indoor heat exchanger falls below “room
temperature +14°C”. Condition(a)
or
(b) accumulated time for the stop of outdoor fan, which is for the protection of compressor from excess current
or for the prevention of overheating of indoor heat exchanger, exceeds 90 minutes after the start of heating
operation or after the completion of previous defrosting operation. Condition(b)
Compressor
Defrosting starts
No judge
current
Current
3.6A
1
4min. 2
55sec.
1min. Max. 9min. 3
Defrosting stops
Indoor fan
OFF OFFON
OFF Hot start Operation
OFF
OFF
super low
Outdoor fan
4way valve
55sec.
1min.
★1.
★2.
★3.
OPERATION DETAILS

– 18 –
REFRIGERATION CYCLE DIAGRAM
INDOOR UNIT
REFRIGERANT PIPING
REFRIGERANT PIPING
2-WAY VALVE
3-WAY VALVE
COOLING MODE
HEATING MODE
4-WAY VALVE
STRAINER CAPILLARY TUBE
CAPILLARY
ACCUMULATOR
COMPRESSOR
REFRIGERANT FLOW
OUTDOOR UNIT
HEAT EXCHANGER
CHECK VALVE
HEAT EXCHANGER
TUBE
OPERATION DETAILS

– 19 –
TROUBLESHOOTING GUIDE
FOR YOUR SAFETY USE
TAN : indoor unit TAG : outdoor unit
●For the safety and proper use and handling of the product, please read and follow the instructions carefully.
●The meaning of the marks below are as follows.
●Neverremodelappliance.
Use designated parts or accessories to avoid accidents.
●In case of gas leakage, not only refill the required amount of the refrigerant gas but
also find out the gas leakage point and mend it. If the service work has to be
suspended before mending the leakage points, be sure to collect the refrigerant
gas in the outdoor unit by using pump then fasten the service ports to avoid any
further leakage. Poisonous gas may be generated when the leaked refrigerant is
exposed to fire.
●Clean the pins of the plug and insert the plug completely into the outlet.
●Be sure to change the cable if it is damaged.
Do not use damaged cable.
●Do not use power supply cord extended or connected in halfway.
●Be sure to put the units to earthing works.
●Be sure to check the insulated resistance, more than 1MΩ.
Warning
※The combinations of three LED indicators (ON/Flashing/OFF) provide the self-diagnosis information as most of them shown in
the trouble shooting guide.
[Note1]
Check
Point
Check
Point
●Be sure to off the plug when servicing.
It may cause the risk of electric shock.
●If leakage of refrigerant occur in the installation, ventilate a room.
If the leaked refrigerant is exposed fire, poisonous gas may be generated.
Danger
Improper use will cause the significant risk of death or serious injury of the user.
Danger
Warning Improper use may cause the risk of death or serious injury of the user.
Caution ProhibitedHigh Voltage
Strict enforcement Connect the earthing cable
Off the Plug
●Please refer the marks below.
High Temperatare
Discharge electricity of the capacitor by making short circuit firstly. Then check the capacitor by tester.
Be sure to set up the tester for the measurement of bigger resistance.