Argo ASR409VHG Manual

TECHNICAL DATA
& SERVICE MANUAL
INDOOR UNIT: ASR409VHG
ASR412VHG
ASR418VHG
SPLIT SYSTEM AIR CONDITIONER
ASR418VHG
0.8180.370.0 07/2004
Model No. Product Code No.
ASR409VHG 387006990
387006992
387006991ASR412VHG

IMPORTANT!
Please read before installation
This air conditioning system meets strict safety and operating
standards.
For the installer or service person, it is important to install or
service the system so that it operates safely and efficiently.
For safe installation and trouble-free operation, you must:
• Carefully read this instruction booklet before beginning.
• Follow each installation or repair step exactly as shown.
• Observe all local, state and national electrical codes.
• ay close attention to all warning and caution notices given in
this manual.
•The unit must be supplied with a dedicated electrical line.
This symbol refers to a hazard or unsafe practice which can result
in severe personal injury or death.
This symbol refers to a hazard or unsafe practice which can result
in personal injury or product or property damage.
If necessary, et help
These instructions are all you need for most installation sites and
maintenance conditions.
If you require help for a special problem, contact our sale/service
outlet or your certified dealer for additional instructions.
In case of improper installation
The manufacturer shall in no way be responsible for improper
installation or maintenance service, including failure to follow the
instructions in this document.
SPECIAL PRECAUTIONS
• During installation, connect before the refrigerant system and
then the wiring one; proceed in the reverse orden when removing
the units.
When wirin
ELECTRICAL SHOCK CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH. ONLY QUALIFIED,
EXPERIENCED ELECTRICIANS SHOULD ATTEMPT
TO WIRE THIS SYSTEM.
• Do not supply power to the unit until all wiring and tubing are
completed or reconnected and checked, to ensure the grounding.
• Highly dangerous electrical voltages are used in this system.
Carefully refer to the wiring diagram and these instructions when
wiring.
Improper connections and inadequate grounding can cause
accidental injury and death.
•Ground the unit following local electrical codes.
• The Yellow/Green wire cannot be used for any connection
different from the ground connection.
• Connect all wiring tightly. Loose wiring may cause overheating
at connection points and a possible fire hazard.
• Do not allow wiring to touch the refrigerant tubing, compressor,
or any moving parts of the fan.
• Do not use multi-core cable when wiring the power supply and
control lines. Use separate cables for each type of line.
When transportin
Be careful when picking up and moving the indoor and outdoor
units. Get a partner to help, and bend your knees when lifting to
reduce strain on your back. Sharp edges or thin aluminium fins on
the air conditioner can cut your fingers.
When installin ...
• Keep all tubing runs as short as possible.
• Use the flare method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces of the flare
and union tubes before connecting them; screw by hand and
then tighten the nut with a torque wrench for a leak-free
connection.
• Check carefully for leaks before starting the test run.
NOTE:
Depending on the system type, liquid and gas lines may be either
narrow or wide. Therefore, to avoid confusion, the refrigerant
tubing for your particular model is specified as narrow tube for
liquid, wide tube for gas.
When servicin
• Turn the power OFF at the main power board before opening
the unit to check or repair electrical parts and wiring.
• Keep your fingers and clothing away from any moving parts.
• Clean up the site after the work, remembering to check that no
metal scraps or bits of wiring have been left inside the unit being
serviced.
• Ventilate the room during the installation or testing the refrigeration
system; make sure that, after the installation, no gas leaks are
present, because this could produce toxic gas and dangerous
if in contact with flames or heat-sources.
WARNING
CAUTION
WARNING
… In a ceiling
Make sure the ceiling is strong enough to hold the unit-weight.
It may be necessary to build a strong wooden or metal frame to
provide added support.
… In a room
Properly insulate any tubing run inside a room to prevent
"sweating", which can cause dripping and water damage to
walls and floors.
... In moist or uneven locations
Use a raised concrete base to provide a solid level foundation
for the outdoor unit. This prevents damage and abnormal
vibrations.
... In area with strong winds
Securely anchor the outdoor unit down with bolts and a metal
frame. Provide a suitable air baffle.
... In a snowy area (for heat pump-type systems)
Install the outdoor unit on a raised platform that is higher then
drifting snow. Provide snow vents.
When connecting refrigerant tubing
2

Page
1. SPECIFICATIONS 4
1-1 Unit specifications 4
1-2 Major Component specifications 7
1-3 Other Component specifications 10
2. DIMENSIONAL DATA 11
3. ELECTRICAL DATA 12
3-1 Electric Wiring Diagram 12
4. FUNCTION 13
4-1 Room Temperature Control 13
4-2 Cold Draft Prevention (Heating Cycle) 15
4-3 Automatic Fan Speed (Indoor Unit) 16
4-4 Freeze Prevention (Cooling) 17
4-5 Overload Protection (Heating) 18
4-6 Discharge Temperature Control (Cooling and Heating) 19
4-7 Auto Mode for Automatic Heating/Cooling Switching 19
4-8 Automatic Restart after Power Interruption 21
4-9 Electronic Expansion Control Valve 21
4-10 Dehumidifying Operation 21
4-11 Auto-Flap Control (Indoor Unit: 4-Way Air Discharge) 22
4-12 Electronic Expansion Valve 23
4-13 Voltage Detection Control 23
5. TROUBLESHOOTING 24
6. CHECKING ELECTRICAL COMPONENTS 57
6-1 Measurement of Insulation Resistance 57
6-2 Checkin
g
Continuit
y
of Fuse on PCB Ass'
y
58
6-3 Checking Motor Capacitor 58
6-4 Thermistor Characteristic Curve 59
7. P.C.B. 60
Table of Contents
3

1. SPECIFICATIONS
1-1 Unit Specifications
ASR409VHG
Power source
V
olta
g
e ratin
g
Performance
Capacity
Air circulation (High/Med./Low) m³/h
Features
Controls/Temperature controls
Remote Controller (Option)
Timer
Fan speed
Airflow direction
Air Filter
Operation sound High dB-A
Refrigerant tubing connections
Refrigerant Narrow tube mm(in.)
tube diameter Wide tube mm(in.)
Refrigerant
Refrigerant control
Dimensions & Wei
g
ht
Dimensions Unit Height mm
Width mm
Depth mm
Ceiling panel Height mm
Width mm
Depth mm
Package dimensions Unit Height mm
Width mm
Depth mm
Volume m3
Ceiling panel Height mm
Width mm
Depth mm
Volume m3
Weight (include panel) Net kg
Shipping kg
Ceiling panel Net kg
Shipping kg
DATA SUBJECT TO CHANGE WITHOUT NOTICE
ON/OFF 72 hours ON/OFF 24 hours & Program
Wired: REM-HWA Wireless: REM-HLA
380
2,5
110
800
650
800
4,7
220 - 240V ~ 50H
z
230V
744
0,07
16,5
21
575
730
0,18
Flare type
9,52 (3/8)
12,7 (1/2)
R407C
Cooling Heating
See catalogue with the requested matching
700/600/500
575
64
730
Microprocessor/ I.C. thermostat
3 and Auto
273
A
uto (Remote control)
Electronic expansion valve
Washable
43
4

ASR412VHG
Power source
V
olta
g
e ratin
g
Performance
Capacity
Air circulation (High/Med./Low) m³/h
Features
Controls/Temperature controls
Remote Controller (Option)
Timer
Fan speed
Airflow direction
Air Filter
Operation sound High dB-A
Refrigerant tubing connections
Refrigerant Narrow tube mm(in.)
tube diameter Wide tube mm(in.)
Refrigerant
Refrigerant control
Dimensions & Wei
g
ht
Dimensions Unit Height mm
Width mm
Depth mm
Ceiling panel Height mm
Width mm
Depth mm
Package dimensions Unit Height mm
Width mm
Depth mm
Volume m3
Ceiling panel Height mm
Width mm
Depth mm
Volume m3
Weight (include panel) Net kg
Shipping kg
Ceiling panel Net kg
Shipping kg
DATA SUBJECT TO CHANGE WITHOUT NOTICE
16,5
110
800
800
730
380
Washable
0,07
744
650
0,18
12,7 (1/2)
64
730
A
uto (Remote control)
43
Flare type
9,52 (3/8)
220 - 240V ~ 50H
z
230V
Cooling Heating
3 and Auto
See catalogue with the requested matching
Microprocessor/ I.C. thermostat
700/600/500
Wired: REM-HWA Wireless: REM-HLA
21
2,5
4,7
ON/OFF 72 hours ON/OFF 24 hours & Program
R407C
Electronic expansion valve
575
575
273
5

ASR418VHG
Power source
V
olta
g
e ratin
g
Performance
Capacity
Air circulation (High/Med./Low) m³/h
Features
Controls/Temperature controls
Remote Controller (Option)
Timer
Fan speed
Airflow direction
Air Filter
Operation sound High dB-A
Refrigerant tubing connections
Refrigerant Narrow tube mm(in.)
tube diameter Wide tube mm(in.)
Refrigerant
Refrigerant control
Dimensions & Wei
g
ht
Dimensions Unit Height mm
Width mm
Depth mm
Ceiling panel Height mm
Width mm
Depth mm
Package dimensions Unit Height mm
Width mm
Depth mm
Volume m3
Ceiling panel Height mm
Width mm
Depth mm
Volume m3
Weight (include panel) Net kg
Shipping kg
Ceiling panel Net kg
Shipping kg
DATA SUBJECT TO CHANGE WITHOUT NOTICE
3 and Auto
Wired: REM-HWA Wireless: REM-HLA
ON/OFF 72 hours ON/OFF 24 hours & Program
See catalogue with the requested matching
Microprocessor/ I.C. thermostat
750/630/530
220 - 240V ~ 50H
z
230V
Cooling Heating
110
800
800
A
uto (Remote control)
44
Flare type
9,52 (3/8)
Washable
575
575
15,88 (5/8)
64
730
R407C
Electronic expansion valve
273
4,7
18,0
730
380
22,7
2,5
0,07
744
650
0,18
6

1-2 Major Component Specifications
ASR409VHG
Controller PCB
Part No.
Controls
Fan & Fan Motor
Type
Q'ty ……. Dia. and lenght mm
Fan motor model…Q'ty
No. Of poles…rpm (230 V, High)
Running Amps A
Power input W
Coil resistance (Ambient temp. 20 °C ) ΩBLU-BLK: 231,0
BLK-GRY: 50,2
GRY-RED: 27,8
RED-WHT: 119,5
WHT-BLU: 49,5
Safety devices Type
Operating temp. Open °C
Close °C
Run capacitor µF
VAC
Panel
Model
Flap motor
rating
rpm
nominal output W
coil resistance (25°C) kΩ
Dew proof heater
Electronic expansion valve
Coil
Coil resistance (20°C) Ω
Valve body
Heat Exch. Coil
Coil
Rows
Fin pitch mm
face area m2
DATA SUBJECT TO CHANGE WITHOUT NOTICE
15,62 ± 15%
450
2,5
0,258
A
luminium plate fin / Copper tube
240 VAC
1,3
1
3
M2LB24ZA12
CR-X253GH
Centrifugal fan
R4E280-AK45-12 …1
4… 870
240 V, 26W
Microprocessor
1…. Ø 280
0,33
75
2
A
SGM0918
Internal thermal protector
160 ± 10K
130 ± 15K
DKV-MOZS438E0
IKV-24D18
YEL - GRY: 46ORG - GRY: 46
BLK - GRY: 46RED - GRY: 46
7

ASR412VHG
Controller PCB
Part No.
Controls
Fan & Fan Motor
Type
Q'ty ……. Dia. and lenght mm
Fan motor model…Q'ty
No. Of poles…rpm (230 V, High)
Running Amps A
Power input W
Coil resistance (Ambient temp. 20 °C ) ΩBLU-BLK: 231,0
BLK-GRY: 50,2
GRY-RED: 27,8
RED-WHT: 119,5
WHT-BLU: 49,5
Safety devices Type
Operating temp. Open °C
Close °C
Run capacitor µF
VAC
Panel
Model
Flap motor
rating
rpm
nominal output W
coil resistance (25°C) kΩ
Dew proof heater
Electronic expansion valve
Coil
Coil resistance (20°C) Ω
Valve body
Heat Exch. Coil
Coil
Rows
Fin pitch mm
face area m2
DATA SUBJECT TO CHANGE WITHOUT NOTICE
ORG - GRY: 46 YEL - GRY: 46
RED - GRY: 46
3
15,62 ± 15%
240 V, 26W
DKV-MOZS438E0
Microprocessor
CR-X253GH
Centrifugal fan
1…. Ø 280
R4E280-AK45-12 …1
4… 870
0,33
75
Internal thermal protector
160 ± 10K
130 ± 15K
240 VAC
2,5
A
SGM0918
M2LB24ZA12
2
450
0,258
BLK - GRY: 46
A
luminium plate fin / Copper tube
1
1,3
IKV-24D18
8

ASR418VHG
Controller PCB
Part No.
Controls
Fan & Fan Motor
Type
Q'ty ……. Dia. and lenght mm
Fan motor model…Q'ty
No. Of poles…rpm (230 V, High)
Running Amps A
Power input W
Coil resistance (Ambient temp. 20 °C ) ΩBLU-BLK: 231,0
BLK-GRY: 50,2
GRY-RED: 27,8
RED-WHT: 119,5
WHT-BLU: 49,5
Safety devices Type
Operating temp. Open °C
Close °C
Run capacitor µF
VAC
Panel
Model
Flap motor
rating
rpm
nominal output W
coil resistance (25°C) kΩ
Dew proof heater
Electronic expansion valve
Coil
Coil resistance (20°C) Ω
Valve body
Heat Exch. Coil
Coil
Rows
Fin pitch mm
face area m2
DATA SUBJECT TO CHANGE WITHOUT NOTICE
IKV-24D18
DKV-MOZS438E0
ORG - GRY: 46 YEL - GRY: 46
RED - GRY: 46 BLK - GRY: 46
240 VAC
2,5
240 V, 26W
3
15,62 ± 15%
A
SGM0918
M2LB24ZA12
160 ± 10K
130 ± 15K
2
450
0,33
Internal thermal protector
75
Centrifugal fan
1…. Ø 280
R4E280-AK45-12 …1
4… 890
Microprocessor
CR-X253GH
A
luminium plate fin / Copper tube
2
1,3
0,258
9

1-3 Other Component Specifications
Trasforme
r
Rating Primary
Secondary
Capacity
Coil resistance Ω
Thermal cut-off temp.
Thermistor
(
Coil sensor TH2, 3, 4
)
Resistance ΚΩ
Thermistor
(
Room sensor TH1
)
Resistance ΚΩ
Drain pump
Model
Rating Voltage
Input
Flow rate
Safet
y
float switch
Model
Contact rating
45 °C 2,2 ± 5%
50 °C 1,8 ± 5%
10 °C 10,0 ± 5%
20 °C 6,3 ± 5%
30 °C 4,0 ± 5%
40 °C 2,7 ± 5%
40 °C 3,1 ± 5%
0 °C 16,5 ± 5%
5 °C 12,8 ± 5%
KTEC-35-S6
5 °C 12,1 ± 5%
10 °C 9,7 ± 5%
20 °C 6,5 ± 5%
30 °C 4,4 ± 5%
55 °C 1,5 ± 5%
PB3M-41E-S4, PCB-41E-S4, PCB-41E-S42-
2
(WHT-WHT): 84
(BRN-BRN): 0,7
145°C
45 °C 2,6 ± 5%
(RED-RED): 2,7
-10 °C 23,7 ± 5%
-5 °C 18,8 ± 5%
0 °C 15,0 ± 5%
A
TR-II215T
A
VAC 230V, 50H
z
10,2V - 1.4
A
7 V
A
PC 30956400
3
220/240V - 50H
z
14W
BI 1300 272
5
230V AC/DC - 0,5
A
0,4 l/min
10

2. DIMENSIONAL DATA
ASR409VHG
ASR412VHG
ASR418VHG
Units: mm
11

3. ELECTRICAL DATA
3-1 Electric Wiring Diagram
12

4. FUNCTIONS
4-1 Room temperature control
The unit adjusts room temperature by turning the outdoor unit’s compressor ON and OFF. This process is
controlled by the thermostat located in the indoor unit. The figures on this and the next page show how each
part of the system performs as the room temperature changes and the thermostat activates the compressor to
start (thermo ON) or stop (thermo OFF). Fig. 1 shows about the cooling cycle, and Fig. 2 shows about the
heating cycle.
(
A
)
C
ooling
Fig. 1
(THERMO. OFF)
(THERMO. ON)
ROOM TEMP.
THERMO. ON
5 MINUTES
MORE THAN
5 MINUTES 3 MINUTES
T+1°C
T-1°C
SET TEMP . T °C
COMPRESSOR
OUTDOOR FAN
(H, M or L)
INDOOR F AN
OFF OFF
OFF OFF
1
1. Refer to 2-4 Outdoor Fan Speed Control
MORE THAN
3 MINUTES MORE THAN 5 MINUTES
ON ON ON
ON ON ON
SET SPEED
OFF OFF
OFF OFF
ON ON ON
ON ON ON
DRAIN PUMP
DEW PROOF
HEATER
BODY SENSOR
1573_X_S
THERMO. OFF
Chart Summary and Explanations
Once the compressor Starts, it keeps running for 5 minutes.
Once the compressor stops, it will not start running again for 3 minutes.
If you change the operation mode ( HEAT, DRY, COOL, or FAN ) during the cooling cycle,
the control circuitstops the compressor for 3 minutes.
the compressor is not controlled by the room sensor.
Thermo ON: When room temperature rises 1°C (2°C when set on body sensor) above
the set temperature T°, (T°+1°C or T°+2°C when set on body sensor):
Compressor ON
Thermo OFF : When the room temperature is -1°C below the set temperature T°:
Compressor OFF
13

(
B
)
Heating
Chart Summary and Explanations
Once the compressor starts, it keeps running for 5 minutes.
If you change the operation mode ( HEAT, DRY, COOL or FAN ) during the heating cycle,
the control circuitstops the compressor for 3 minutes.
the compressor is not controlled by the room sensor.
When set on remote control sensor
Thermo ON: When room temperature is -1°C below the set temperature T°.
Compressor ON
Thermo OFF: When the room temperature is 1°C above the set temperature T°, (T°+1°C)
Compressor OFF
When set on body sensor
Fig.
2
THERMO. ON THERMO. ON
+1°C
OFF OFF
2
1. Refer to 2-4 Outdoor Fan Speed Control
OFF
SET SPEED
ON ON ON
ON (REVERSING CYCLE)
ON
TEMP.
OPERATION
REMOTE CONTROL
SENSOR
(Only for wireless
remote controller)
BODY SENSOR
OFF
OFF
SET SPEEDSET SPEED
3 SECONDS
ON OFF ON
MORE THAN
3 MINUTES
OFF
ONOFF
ON OFF ONOFFOFF ON
3 MINUTES MORE THAN
5 MINUTES5 MINUTES
THERMO. ON
THERMO. ONTHERMO. ON
THERMO. ON
2. Refer to 2-2 Cold Draft Prevention (Heating)
BUTTON
COIL (4-WAY)
SOLENOID
E2
TEMP.
COIL
EXCH.
INDOOR HEAT
STANDBY
2
INDOOR FAN
1
OUTDOOR FAN
(H, M or L)
COMPRESSOR
SET. +1°C
SET. -1°
-1 °C
SET TEMP.+4 °C SHIFT
THERMO. OFF THERMO. OFF
OFF
(31°C)
27°C
25°C
1574_X_S
THERMO. OFF THERMO. OFF
LL LL
LL
LL
SETTING TEMP.
SET TEMP.
14

4-2 Cold Draft Prevention (Heating Cycle)
The cold draft prevention function controls indoor fan speed so a strong draft of cold air will not blow out before
the indoor heat exchange coils have warmed up.
STANDBY shows on the remote controller when the indoor fan speed is LL (very low) or OFF. This condition
occurs in the following 3 cases:
• During Thermo OFF (refer to 2-1 B). Room Temperature Control, Heating)
• During the defrosting operation (refer to 2-10 Defrosting Control, Heating)
• Until either the coil temperature E2 reaches 27°C or when a maximum of 6 minutes has past.
The indoor fan motor operates in L instead of LL for 3 seconds as it starts to
give the fan an initial boost.
Chart Summary and Explanations
the set fan speed as the coil temperature
E2
rises.
The indoor unit’s coil temperature is taken from sensor E2 located in the middle of the indoor
heat exchange coil.
The dotted line shows that the indoor fan motor is OFF . When the temperature at sensor E2
falls below 10°C, the indoor fan motor stops running.
Fig. 3
33
31
27
25
10
SET
FA N
SPEED
AUTO OR H
M
L L L LL/OFF LL L L L
LL LL/OFF LL L M M
LL LL/OFF LL L M H
MAX. 6 MINUTES
“STANDBY”
INDICATOR
INDOOR UNIT
COIL TEMP.
E2 ( °C)
LL= Very low speed
L= Low speed M= Medium speed H= High speed
“STANDBY” APPEARS
0673_X_S
15

4-3 Automatic Fan Speed (Indoor Unit)
By pressing the FAN SPEED button on the remote controller, the fan speed can be set at one of four steps:
AUTO., HI., MED., or LO. When set at AUTO. the indoor unit fan speed will be automatically adjusted to the room
temperature as the two charts shown below.
Chart Explanations and notes
(B) Heating
Fig. 5
Chart Explanations and notes
Fig. 4
(
A
)
C
ooling
INDOOR FAN
SPEED L
HMM H
0433_M_S
ROOM TEMP.
(deg)
SET TEMP.
+3
+2
+1
H
M
: High
: Middle
L
LL
: Low
: Very low
INDOOR FAN
SPEED HL
MMH
0434_M_S
ROOM TEMP.
(deg)
SET TEMP.
-2
-4
H
M
: High
: Middle
L
LL
: Low
: Very low
16

4-4 Freeze Prevention (Cooling)
Freeze Prevention keeps the indoor heat exchange coil from freezing. Freezing reduces the efficiency of the
unit, and frost build up on the coil blocks cool air circulation from the indoor unit's fan.
Note: Freeze prevention is controlled by the temperature at the indoor heat exchanger coil as sensed by
either sensor E1 (located at the entrance of the coil) or sensor E2 (located on the middle of the coil).
Freeze prevention cycle is controlled by the lower temperature sensed at either of the two sensors.
This chart shows when the electronic expansion valve opens to regulate the temperature of the indoor unit
coil to prevent freezing.
If the refrigerant control is not effective and the temperature continues to drop and stays below 0°C for 2
minutes continuously, the control circuit stops the compressor. The compressor does not start again until
the temperature rises above 1°C. The compressor stops for 3 minutes minimum.
Note: • When low fan speed is selected and the air conditioner is in cooling operation at a low outdoor
temperature of less than 10°C, the air conditioner may automatically switch to medium fan
speed.
• Cut the jumper wire (JP11) on the outdoor P.C.B. when the above FMI control (L M) is not
needed.
Chart Explanations and notes
Fig. 8
(°C)
INDOOR UNIT
COIL TEMP.
ELECTRONIC
EXPANSION
VALVE SIGNAL
MIN. VALUE OF
EITHER E1 OR E2
1
3
-0.5
0
-0.5
COMPRESSOR
CONTINUOUS
DETECTION
FOR 2 MINUTES
ON ON
1563
_
M
_
S
FMI CONTROL L ML M
17

4-5 Overload Protection (Heating)
This function prevents the air conditioner from overloading.
Chart Explanations and notes
W
hen sensor E2 rises above 60°
30 seconds until E2 falls below 59°C.
Sensor E2
W
hen sensor E2 rises above 62°C, the control circuit stops the outdoor fan motor till the
temp. drops to 55°C
Fig. 10
(°C)
ELECTRONIC
EXPANSION VALVE
INDOOR UNIT COIL
TEMP. (E2)
64
61
60
59
55
53
OUTDOOR FM START UP
COMPENSATION
OFF
OPEN
H or M H L
1565_M_S
FUZZY CONTROLFUZZY CONTROL
OVERLOAD
PROTECTION OVERLOAD PROTECTION
OPEN
H or M
18

4-6 Discharge Temperature Control (Cooling and Heating)
This function prevents the compressor motor from burn out by overheating.
Discharge temperature is sensed by TH8 (discharge gas sensor).
When the temperature rises above 95°C the electronic refrigerant control valve opens at 50 steps/30
seconds until the temperature falls below 93°C.
During HEATING operation, when the temperature rises above 105°C, the control circuit stops the outdoor
fan motor until the temperature falls below 90°C. Please note that this control does not function during
COOLING operation.
For both COOLING and HEATING modes, if the temperature reaches 115°C (135°C for 48 type) the
operation shuts down and alarm P3 appears on the remote controller.
The outdoor fan speed is controlled on discharge temp. at heating mode.
4-7 Auto. Mode for Automatic Heating/Cooling Switching
When the AUTO mode is selected, the microprocessor calculates the difference between the set
temperature and the room temperature, and automatically switches to the COOLING or HEATING mode to
maintain the desired temperature.
Room temp. > Set temp. COOLING
=
Room temp. < Set temp. HEATING
This means that if the room temperature is higher or equal to the set temperature, COOLING operation
starts. If the room temperature is lower than the set temperature, HEATING operation starts.
Chart Summary and Explanations
Fig. 11
OUTDOOR
FAN SPEED
DISCHARGE GAS
TEMP. ( °
115
105
95
93
90
85
COMPRESSOR
ELECTRONIC
EXPANSION VALVE
(DISCHARGE TEMP.)
TRIP IS OPERATED.
H or M L
1566_M_S
OPENOPEN
H or M
ON
19

4-7 Auto. Mode for Automatic Heating/Cooling Switching
Fig. 12
Chart summary and Explanations
This chart shows how the Operation Mode ( COOLING or HEATING ) is determined by the
is selected.
20° C to 22° C.
(The display of the remote controller remains 20° C.)
the room temperature during the operation is as follows.
Heating to Cooling; Room temp >= Shifted temp + 0.5 deg.
Cooling to Heating; Room temp.< =
Shifted temp -1.0deg.
For example, if the room temperature rises above 22.5°C (=22+0.5) during the cooling
operation at the room temperature 20¡ C set by the remote controller, the operation
° C (=18-1.0) thereafter,
the operation changes to heating again.
COOLING SELECTION TEMP.
+2.5 deg
SHIFT SET TEMP.
+2 deg
REMOTE CONTROLLED
SET TEMP.
SHIFT SET TEMP.
-2 deg
HEATING SELECTION TEMP.
-3 deg
HEATING COOLING HEATING
0440_M_S
A
B
C
20