TECHNICAL DATA & SERVICE MANUAL
Indoor Unit Outdoor Unit
MCA451R GR451R
MCA601R GR601R
SPLIT SYSTEM AIR CONDITIONER
INDOOR UNIT
OUTDOOR UNIT
0.8180.247.1 06/2002
i
Important!
Please Read Before Starting
This air conditioning system meets strict safety and
operating standards. As the installer or service person,
it is an important part of your job to install or service the
system so 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.
●Pay close attention to all warning and caution notices
given in this manual.
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, Get Help
These instructions are all you need for most installation
sites and maintenance conditions. If you require help
for a special problem, contact our sales/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
When Wiring
ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR
DEATH. ONLY A QUALIFIED,
EXPERIENCED ELECTRICIAN SHOULD
ATTEMPT TO WIRE THIS SYSTEM.
• Do not supply power to the unit until all wiring and
tubing are completed or reconnected and checked.
• 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 or death.
• Ground the unit following local electrical codes.
• Connect all wiring tightly. Loose wiring may cause
overheating at connection points and a possible fire
hazard.
WARNING
CAUTION
WARNING
When Transporting
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 aluminum fins on the air conditioner can
cut your fingers.
When Installing…
…In a Ceiling or Wall
Make sure the ceiling/wall is strong enough to hold the
unit’s weight. It may be necessary to construct a strong
wood or metal frame to provide added support.
…In a Room
Properly insulate any tubing run inside a room to
prevent “sweating” that can cause dripping and water
damage to walls and floors.
…In Moist or Uneven Locations
Use a raised concrete pad or concrete blocks to
provide a solid, level foundation for the outdoor unit.
This prevents water damage and abnormal vibration.
…In an Area with High 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 than drifting snow. Provide snow vents.
When Connecting Refrigerant Tubing
• Use the flare method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces
of the flare and union tubes before connecting them,
then tighten the nut with a torque wrench for a leakfree connection.
• Check carefully for leaks before starting the test run.
When Servicing
• Turn the power off at the main power box (mains)
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 you finish, remembering to
check that no metal scraps or bits of wiring have
been left inside the unit being serviced.
Others
• Ventilate any enclosed areas when installing or
testing the refrigeration system. Escaped refrigerant
gas, on contact with fire or heat, can produce
dangerously toxic gas.
• Confirm upon completing installation that no
refrigerant gas is leaking. If escaped gas comes in
contact with a stove, gas water heater, electric room
heater or other heat source, it can produce
dangerously toxic gas.
CAUTION
Page
1. OPERATING RANGE
1
2. SPECIFICATIONS
2
2-1. Unit Specifications 2
2-2. Major Component Specifications 4
2-3. Other Component Specifications 7
3. DIMENSIONAL DATA
8
4. REFRIGERANT FLOW DIAGRAM
10
5. PERFORMANCE DATA
12
5-1. Performance Charts 12
5-2. Air Throw Distance Chart 13
5-3. Cooling Capacity 14
5-4. Heating Capacity 16
6. ELECTRICAL DATA
17
6-1. Electrical characteristics 17
6-2. Electrical Wiring Diagrams 19
7. FUNCTION
20
7-1 Cool Mode Operation 20
7-2 Heat Mode Operation 21
7-3 Auto Mode Operation 22
7-4 Dry Mode Operation 23
7-5 Fan Mode Operation 23
7-6 Protection Operations in Cool and Dry Modes 24
7-7 Protection Operations in Heat Mode 26
7-8 Cold Draft Prevention (Heating) 29
7-9 Sleep Function 30
7-10 Daily Timer Function 30
7-11 IFEEL Function 30
7-12 Louver Control 30
7-13 Manual Unit Control and Led Indicators 31
7-14 Recovery from Power Failure 31
8. TROUBLESHOOTING
32
8-1 Check before and after troubleshooting 32
8-2 Air conditioner does not operate 33
8-3 Some part of air conditioner does not operate 37
8-4 Air conditioner operates, but abnormalities are observed 39
8-5 If a sensor is defective 41
9. CHECKING ELECTRICAL COMPONENTS
42
9-1 Measurement of Insulation Resistance 42
9-2 Checking Continuity of Fuse on PCS Ass'
y
43
9-3 Checking Motor Capacitor 43
Table of Contents
ii
1
1. OPERATING RANGE
Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.
Cooling
Maximum 32°C D.B. / 23°C W.B. 46°C D.B.
Minimum 19°C D.B. / 14°C W.B. 19°C D.B.
Heating
Maximum 27°C D.B. 24°C D.B. / 18°C W.B.
Minimum / – 8°C D.B. / – 9°C W.B.
2
2. SPECIFICATIONS
2-1. Unit Specifications
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 27°C D.B. / 19°C W.B.
Outdoor air temperature 35°C D.B. / 24°C W.B.
Heating: Indoor air temperature 20°C D.B.
Outdoor air temperature 7°C D.B. / 6°C W.B.
Power Source 230 V Single phase 50 Hz
Voltage rating V 230
Cooling Heating
Capacity
W 4400 5000
BTU/h 15020 17065
Air circulation (High) m
3
/h 760
Moisture removal (High) Liters/h 2.3 —
Available voltage range V 198 to 264
Running amperes A 7.2 7.0
Power input W 1570 1500
Power factor % 94.8 93.2
C.O.P. W/W 2.80 3.33
Compressor locked rotor amperes A 43
Controls / Temperature control Microprocessor / I.C. thermostat
Control unit Wireless remote control unit
Timer ON/OFF 24 hours and program
Fan speeds Indoor / Outdoor 3 and Auto /1-Hi
Airflow direction (Indoor)
Horizontal Manual
Vertical Auto
Air filter Washable
Compressor Rotary (Hermetic)
Refrigerant / Amount charged at shipment g R22 / 1250
Refrigerant control Capillary tube
Noise power level
Indoor – Hi / Me / Lo dB-A 55 / 51 / 49
Outdoor – Hi dB-A 65
Refrigerant tubing connections Flare type
Max. allowable tubing length at shipment m 7.5
Refrigerant tube
Narrow tube mm (in.) 6.35 (1/4)
diameter
Wide tube mm (in.) 12.7 (1/2)
Indoor Unit Outdoor Unit
Unit dimensions Height mm 285 630
Width mm 995 830
Depth mm 206 305
Package dimensions Height mm 276 713
Width mm 1,070 994
Depth mm 363 413
Weight Net
kg 12.0 52
Shipping
kg 15.0 57
Shipping volume m
3
0.11 0.29
Dimensions & Weight Features Electrical Rating Performance
Indoor Unit MCA451R
Outdoor Unit GR451R
3
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 27°C D.B. / 19°C W.B.
Outdoor air temperature 35°C D.B. / 24°C W.B.
Heating: Indoor air temperature 20°C D.B.
Outdoor air temperature 7°C D.B. / 6°C W.B.
Power Source 230 V Single phase 50Hz
Voltage rating V 230
Cooling Heating
Capacity
W 5500 6200
BTU/h 18770 21160
Air circulation (High) m
3
/h 760
Moisture removal (High) Liters/h 2.7 —
Available voltage range V 198 to 264
Running amperes A 10 10.2
Power input W 2200 2100
Power factor % 95.6 89.5
C.O.P. W/W 2.5 2.95
Compressor locked rotor amperes A 57
Controls / Temperature control Microprocessor / I.C. thermostat
Control unit Wireless remote control unit
Timer ON/OFF 24 hours and program
Fan speeds Indoor / Outdoor 3 and Auto / 1
Airflow direction (Indoor)
Horizontal Manual
Vertical Auto
Air filter Washable
Compressor Rotary (Hermetic)
Refrigerant / Amount charged at shipment g R22 / 1570
Refrigerant control Capillary tube
Noise power level
Indoor – Hi / Me / Lo dB-A 55 / 51 / 49
Outdoor – Hi dB-A 65
Refrigerant tubing connections Flare type
Max. allowable tubing length at shipment m 7.5
Refrigerant tube
Narrow tube mm (in.) 6.35 (1/4)
diameter
Wide tube mm (in.) 12.7 (1/2")
Indoor Unit Outdoor Unit
Unit dimensions Height mm 285 630
Width mm 995 830
Depth mm 206 305
Package dimensions Height mm 276 713
Width mm 1,070 994
Depth mm 363 413
Weight Net
kg 12.0 55
Shipping
kg 15.0 60
Shipping volume m
3
0.11 0.29
Dimensions & Weight Features Electrical Rating Performance
Indoor Unit MCA601R
Outdoor Unit GR601R
4
2-2. Major Component Specifications
2-2-1. Indoor Unit
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Part No. WSA
Controls Microprocessor
Control circuit fuse 250 V – 3.15 A
Remote Control Unit RC–2 (RC)
Type Cross-flow
Q´ty ... Dia. and length mm 1 ... ø88 / L746
Fan motor model ... Q´ty UF2– 31A5PA–S ... 1
No. of poles ...Cool / Heat rpm (High) 2 ... 1305 / 1335
Nominal output W 30
Coil resistance (Ambient temp. 20°C) Ω WHT – BRN : 130.4
WHT – PNK : 169.8
– : –
– : –
– : –
Safety
Type Thermal protector
devices Operating temp. Open °C 130 ± 8
Close Automatic reclosing
Run capacitor µF 2.0
VAC 440
Type Stepping motor
Model MP24GA2
Rating DC 12 V
Coil resistance (Ambient temp. 20°C) Ω Each terminals (1–2, 1–3, 1–4, 1–5) 400 : ± 7%
Coil Aluminium plate fin / Copper tube
Rows 2
Fin pitch mm 1.3
Face area m2 0.250
Heat
Exch. Coil
Flap Motor Fan & Fan Motor
Controller
PCB
Indoor Unit MCA451R MCA601R
5
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Type Rotary (Hermetic)
Compressor model PH 28 VSRT
Nominal output W 1250
Compressor oil ... Amount cc DIAMOND MS 32(N1)...670
Coil resistance (Ambient temp. 20°C) Ω C – R : 1.43
C – S : 2.40
Type Internal protector
Safety
devices Operating temp. Open °C Automatic opening
Close °C Automatic reclosing
Operating amp.(Ambient temp. 25°C) Automatic
Run capacitor
µF 40
VAC 450
Type Propeller
Number ... Dia. mm 1 ... ø 400
Fan motor model ... Number KFG6-51SB5P....... 1
No. of poles ... rpm (230 V, High) 6 ... 910
Nominal output W 40
Coil resistance (Ambient temp. 20°C) Ω WHT – BRN : 98.5
WHT – PNK : 201
Safety
Type Thermal protector
devices Operating temp. Open °C 130 ± 5
Close °C 83 ± 15
Run capacitor µF 2.0
VAC 440
Coil Aluminium plate fin / Copper tube
Rows 1
Fin pitch mm 1.3
Face area m
2
0.5
External Finish Acrylic baked-on enamel finish
Heat
Exch. Coil
CompressorFan & Fan Motor
Outdoor Unit GR451R
6
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Type Rotary (Hermetic)
Compressor model PH 36 VTRT
Nominal output W 1600
Compressor oil ... Amount cc DIAMOND MS 32(N1)...900
Coil resistance (Ambient temp. 20°C) Ω C – R : 1.06
C – S : 2.03
Type Internal protector
Safety
devices Operating temp. Open °C Automatic opening
Close °C Automatic reclosing
Operating amp.(Ambient temp. 25°C) Automatic
Run capacitor
µF 55
VAC 450
Type Propeller
Number ... Dia. mm 1 ... ø 400
Fan motor model ... Number KFG6-51SB5P....... 1
No. of poles ... rpm (230 V, High) 6 ... 910
Nominal output W 40
Coil resistance (Ambient temp. 20°C) Ω WHT – BRN : 98.5
WHT – PNK : 201
Safety
Type Thermal protector
devices Operating temp. Open °C 130 ± 5
Close °C 83 ± 15
Run capacitor µF 2.0
VAC 440
Coil Aluminium plate fin / Copper tube
Rows 2
Fin pitch mm 1.6
Face area m
2
0.487
External Finish Acrylic baked-on enamel finish
Heat
Exch. Coil
CompressorFan & Fan Motor
Outdoor Unit GR601R
2-3. Other Component Specifications
7
4-way Valve (20S) SQ-136 (Coil), SHF-7K-34U (Valve)
Coil rating 230 V ~ 50 Hz - 6 W
Coil resistance (at 20 °C) Ω
1440 ±5%
Outdoor Unit GR451R GR601R
Thermistor (Coil sensor) NTC - SENSOR
Resistance (at 25°C) kΩ 10 ±5%
Indoor Unit MCA451R MCA601R
Thermistor (Room sensor) NTC - SENSOR
Resistance (at 25°C) kΩ 10 ±5%
Power Relay (PR) G7L-2A-TUB
Coil rating AC 200–240V, 50/60 Hz
Coil resistance (at 23 °C) Ω 21 ± 15%
Contact rating AC 220V, 25A
Thermistor (Coil sensor) NTC - SENSOR
Resistance (at 25°C) kΩ 10 ±1%
8
3. DIMENSIONAL DATA
Indoor Unit MCA451R MCA601R
28545
995
45
147.5 147.5
206 (3)
Remote control unit
Center of tubing
hole (2 places)
Narrow tube ø6.35 (1/4")
Drain hose ø18
Wide tube ø12.7 (1/2") MCA451,601R
61
18.5
172.5
Unit : mm
9
Outdoor Unit GR451R GR601R
Air discharge
Air intake
538 146
307
337
4 – ø12 holes
830
19
630
305
61
95
Wide tube service valve
ø12.7 (1/2")
Narrow tube service valve
ø6.35 (1/4")
Unit : mm
4. REFRIGERANT FLOW DIAGRAM
10
Insulation of Refrigerant Tubing
Because capillary tubing is used in the outdoor unit, both the
wide and narrow tubes of this air conditioner become cold. To
prevent heat loss and wet floors due to dripping of
condensation, both tubes must be well insulated with a
proper insulation material. The thickness of the insulation
should be a min. 8 mm.
After a tube has been insulated,
never try to bend it into a narrow
curve because it can cause the tube
to break or crack.
IMPORTANT
CAUTION
Wide tube
Thickness:
Min. 8 mm
Insulation
Narrow tube
Thickness:
Min. 8 mm
11
5. PERFORMANCE DATA
5-1. Performance charts
Indoor Unit MCA451R MCA601R
Outdoor Unit GR451R GR601R
Indoor inlet air
D.B. temp. (°C)
Outdoor
fan speed
HighLow
1.38 (13)
1.28 (12)
1.18 (11)
1.08 (10)
0.98 ( 9 )
0.89 ( 8 )
0.79 ( 7 )
0.69 ( 6 )
25 30 35 40 45 50
Outdoor inlet air D.B. temp. (°C)
Low pressure at wide tube serveice valve MPa (kgf/cm
2
G)
0.59 ( 5 )
0.49 ( 4 )
0.39 ( 3 )
■ Cooling Characteristics ■ Heating Characteristics
Indoor inlet air
D.B. temp. (°C)
3.44 (34)
3.24 (32)
2.95 (30)
2.85 (28)
2.65 (26)
2.46 (24)
2.26 (22)
2.06 (20)
–5 0 5 10 15 20
Outdoor inlet air D.B. temp. (°C)
High pressure at wide tube serveice valve MPa (kgf/cm
2
G)
1.87 (18)
1.67 (16)
1.47 (14)
25
Indoor inlet air
D.B. temp. (°C)
14
13
12
11
10
9
8
7
6
25 30 35 40 45 50
Outdoor inlet air D.B. temp. (°C)
Operating current (A)
15
Indoor inlet air
D.B. temp. (°C)
Outdoor
fan speed
HighLow
13
12
11
10
9
8
7
6
–5 0 5 10 15 20
Outdoor inlet air D.B. temp. (°C)
Operating current (A)
25
14
15
32
27
21
27
20
16
27
20
16
32
27
21
Overload prevention operates to protect the air conditioner when outdoor ambient temperature reaches extremely
high in heating mode. (Refer to “8-5 Overload prevention”)
● ...... Points of Rating condition
Black dots in above charts indicate the following rating conditions.
Cooling: Indoor air temperature 27°C D.B./19°C W.B. Heating: Indoor air temperature 20°C D.B.
Outdoor air temperature 35°C D.B./24°C W.B. Outdoor air temperature 7°C D.B./6°C W.B.
NOTE
12
5-2. Air Throw Distance Chart
Horizontal distance (m)
Axis air velocity (m/s)
Vertical distance (m)
Room air temp. : 20°C
Fan speed : High
Heating
Horizontal distance (m)
Axis air velocity (m/s)
Vertical distance (m)
Room air temp. : 27°C
Fan speed : High
Cooling
0
1
2
3
4
0 1 2 3 4 5 6 7 8 9
: Flap angle 0° , : Axis air velocity 0°
: Flap angle 30°, : Axis air velocity 30°
0
1
2
3
4
0 1 2 3 4 5 6 7 8 9
: Flap angle 45° , : Axis air velocity 45°
: Flap angle 60° , : Axis air velocity 60°
13
Indoor Unit MCA451R MCA601R
5-3. Cooling Capacity
INDOOR UNIT: MCA451R
OUTDOOR UNIT: GR451R
RATING CAPACITY 4,4 kW
AIR FLOW RATE 760 m³/h
EVAPORATOR CONDENSER
ENT.TEMP. °C OUTDOOR AMBIENT TEMP. °C
W.B. D.B. 25 30 35 40 43
TC 4,17 4,05 3,85 3,62 3,34
CM 1,29 1,38 1,48 1,63 1,77
21 SHC 2,86 2,80 2,71 2,59 2,46
23 SHC 3,24 3,18 3,08 2,97 2,83
15 25 SHC 3,61 3,54 3,44 3,33 3,19
27 6 3,99 3,91 3,82 3,62 3,34
29 SHC 4,17 4,05 3,85 3,62 3,34
31 SHC 4,17 4,05 3,85 3,62 3,34
TC 4,51 4,34 4,13 3,88 3,58
CM 1,32 1,42 1,52 1,68 1,82
21 SHC 2,50 2,43 2,33 2,22 2,08
23 SHC 2,87 2,79 2,70 2,58 2,45
17 25 SHC 3,26 3,17 3,07 2,96 2,81
27 SHC 3,63 3,53 3,43 3,32 3,19
29 SHC 4,02 3,90 3,81 3,69 3,55
31 SHC 4,39 4,27 4,13 3,88 3,58
TC 4,78 4,62 4,40 4,13 3,81
CM 1,39 1,46 1,57 1,72 1,87
21 SHC 2,09 2,03 1,93 1,82 1,68
23 SHC 2,46 2,40 2,31 2,19 2,06
19 25 SHC 2,82 2,76 2,67 2,56 2,42
27 SHC 3,19 3,14 3,04 2,93 2,79
29 SHC 3,54 3,50 3,41 3,30 3,16
31 SHC 3,91 3,87 3,78 3,66 3,53
TC 5,07 4,90 4,67 4,38 4,04
CM 1,42 1,50 1,62 1,77 1,92
23 SHC 2,07 2,00 1,90 1,79 1,65
21 25 SHC 2,42 2,36 2,28 2,16 2,03
27 SHC 2,79 2,74 2,64 2,53 2,39
29 SHC 3,14 3,10 3,01 2,90 2,76
31 SHC 3,51 3,47 3,38 3,27 3,14
TC 5,41 5,18 4,90 4,58 4,27
CM 1,45 1,54 1,66 1,81 1,97
23 25 SHC 2,03 1,94 1,84 1,72 1,61
27 SHC 2,38 2,31 2,20 2,09 1,97
29 SHC 2,73 2,68 2,57 2,46 2,34
31 SHC 3,12 3,05 2,94 2,82 2,72
TC: TOTAL COOLING CAPACITY kW
SHC: SENSIBLE HEAT CAPACITY kW
CM: COMPRESSOR INPUT kW
RATING CONDITIONS
OUTDOOR AMBIENT TEMPERATURE 35°C D.B.
INDOOR UNIT ENTERING AIR TEMP. 27°C D.B./19°C W.B.
14
INDOOR UNIT: MCA601R
OUTDOOR UNIT: GR601R
RATING CAPACITY 5,5 kW
AIR FLOW RATE 760 m³/h
EVAPORATOR CONDENSER
ENT.TEMP. °C OUTDOOR AMBIENT TEMP. °C
W.B. D.B. 25 30 35 40 43
TC 5,21 5,06 4,82 4,52 4,17
CM 1,81 1,93 2,08 2,28 2,48
21 SHC 3,57 3,50 3,38 3,24 3,07
23 SHC 4,05 3,97 3,85 3,71 3,54
15 25 SHC 4,51 4,42 4,30 4,16 3,99
27 6 4,99 4,89 4,77 4,52 4,17
29 SHC 5,21 5,06 4,82 4,52 4,17
31 SHC 5,21 5,06 4,82 4,52 4,17
TC 5,64 5,43 5,17 4,85 4,47
CM 1,85 1,99 2,13 2,35 2,55
21 SHC 3,13 3,04 2,92 2,77 2,59
23 SHC 3,59 3,49 3,37 3,23 3,06
17 25 SHC 4,07 3,96 3,84 3,69 3,52
27 SHC 4,54 4,41 4,29 4,15 3,98
29 SHC 5,02 4,88 4,76 4,62 4,44
31 SHC 5,49 5,33 5,17 4,85 4,47
TC 5,98 5,78 5,50 5,17 4,76
CM 1,95 2,05 2,20 2,41 2,62
21 SHC 2,62 2,53 2,42 2,27 2,10
23 SHC 3,08 3,00 2,88 2,74 2,57
19 25 SHC 3,53 3,46 3,34 3,20 3,03
27 SHC 3,98 3,92 3,80 3,66 3,49
29 SHC 4,42 4,38 4,26 4,13 3,95
31 SHC 4,89 4,84 4,72 4,58 4,41
TC 6,34 6,12 5,83 5,48 5,05
CM 1,99 2,11 2,27 2,48 2,70
23 SHC 2,59 2,50 2,38 2,24 2,07
21 25 SHC 3,03 2,95 2,85 2,70 2,53
27 SHC 3,49 3,42 3,30 3,17 2,99
29 SHC 3,93 3,87 3,77 3,62 3,46
31 SHC 4,39 4,34 4,22 4,09 3,92
TC 6,77 6,48 6,12 5,73 5,33
CM 2,03 2,16 2,32 2,54 2,76
23 25 SHC 2,54 2,43 2,30 2,15 2,01
27 SHC 2,97 2,88 2,75 2,61 2,46
29 SHC 3,42 3,35 3,22 3,07 2,93
31 SHC 3,90 3,81 3,67 3,53 3,40
TC: TOTAL COOLING CAPACITY kW
SHC: SENSIBLE HEAT CAPACITY kW
CM: COMPRESSOR INPUT kW
RATING CONDITIONS
OUTDOOR AMBIENT TEMPERATURE 35°C D.B.
INDOOR UNIT ENTERING AIR TEMP. 27°C D.B./19°C W.B.
15
5-4. Heating Capacity
Indoor Unit MCA451R MCA601R
Outdoor Unit GR451R GR601R
–5 0 5
7
10 15
Outdoor temperature (°C D.B.)
0
10
20
30
40
50
60
70
80
90
100
110
120
Heating capacity ratio (%)
NOTE
1) … Point of Rating condition
Black dot in the chart indicate the following rating condition.
Indoor : 20°C D.B.
Outdoor : 7°C D.B. / 6°C W.B.
2) Above characteristics indicate instantaneous operation, which does not take into
account defrost operation.
3) Fan speed : High
4) Because this air conditioner heats a room by drawing in the heat of the outside
air (heat pump system), the heating efficiency will fall off when the outdoor
temperature is very low. If sufficient heat cannot be obtained with this air
conditioner, use another heating appliance in conjunction with it.
–8
16
17
6. ELECTRICAL DATA
6-1. Electrical Characteristics
Indoor Unit MCA451R
Outdoor Unit GR451R
COOLING
Indoor Unit Outdoor Unit Complete Unit
Fan Motor Fan Motor Compressor
Performance at 230 V Single phase 50 Hz
Rating Conditions Running Amps. A 0.37 0.50 6.33 7.2
Power Input kW 0.070 0.093 1.407 1.57
Full Load Conditions Running Amps. A 0.37 0.50 7.63 8.5
Power Input kW 0.070 0.093 1.727 1.89
Rating Conditions : Indoor Air Temperature 27°C D.B. / 19°C W.B.
Outdoor Air Temperature 35°C D.B.
Full Load Conditions : Indoor Air Temperature 32°C D.B. / 23°C W.B.
Outdoor Air Temperature 46°C D.B.
HEATING
Indoor Unit Outdoor Unit Complete Unit
Fan Motor Fan Motor Compressor
Performance at 230 V Single phase 50 Hz
Rating Conditions Running Amps. A 0.37 0.50 6.13 7.0
Power Input kW 0.070 0.093 1.337 1.50
Full Load Conditions Running Amps. A 0.37 0.50 7.18 8.05
Power Input kW 0.070 0.093 1.637 1.8
Rating Conditions : Indoor Air Temperature 20°C D.B.
Outdoor Air Temperature 7°C D.B. / 6°C W.B.
Full Load Conditions : Indoor Air Temperature 27°C D.B.
Outdoor Air Temperature 24°CD.B. / 18°CW.B.
Indoor Unit MCA601R
Outdoor Unit GR601R
COOLING
Indoor Unit Outdoor Unit Complete Unit
Fan Motor Fan Motor Compressor
Performance at 230 V Single phase 50 Hz
Rating Conditions Running Amps. A 0.37 0.55 9.08 10.0
Power Input kW 0.070 0.120 2.01 2.2
Full Load Conditions Running Amps. A 0.37 0.55 10.08 11.0
Power Input kW 0.070 0.120 2.21 2.4
Rating Conditions : Indoor Air Temperature 27°C D.B. / 19°C W.B.
Outdoor Air Temperature 35°C D.B.
Full Load Conditions : Indoor Air Temperature 32°C D.B. / 23°C W.B.
Outdoor Air Temperature 46°C D.B.
HEATING
Indoor Unit Outdoor Unit Complete Unit
Fan Motor Fan Motor Compressor
Performance at 230 V Single phase 50 Hz
Rating Conditions Running Amps. A 0.37 0.55 9.28 10.2
Power Input kW 0.070 0.120 1.91 2.10
Full Load Conditions Running Amps. A 0.37 0.55 10.38 11.3
Power Input kW 0.070 0.120 2.13 2.32
Rating Conditions : Indoor Air Temperature 20°C D.B.
Outdoor Air Temperature 7°C D.B. / 6°C W.B.
: Indoor Air Temperature 27°C D.B.
Outdoor Air Temperature 24°CD.B. / 18°CW.B.
Full Load Conditions
18
6-2 Electric Wiring Diagrams
Indoor Unit MCA451R MCA601R
Outdoot Unit GR451R GR601R
19
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
WARNING
7-1 Cool Mode Operation
(RT - SPT) [oc]
+3
+2
+1
0
-1
ON
OFF
ON
OFF
H
L
M
ON
OFF
COMP
OFAN
IFAN
RV
over 3 min over 5 min
over 30 sec
In Cool Mode, the operation of the Compressor (COMP), Outdoor Fan (OFAN) and Indoor Fan (IFAN)
are determined by the difference between the Room Temperature (RT) and the Set Point Temperature
(SPT) as in the graph above.
Notes:
1. In this graph, the IFAN is operating in the “Auto Fan Speed” setting. If the user has selected the low,
medium or high fan speed, the IFAN will run constantly at that speed only.
2. In addition to the value of (RT-SPT), the operations of the relays are also controlled by protection
delays. For example, (a) the minimum On/Off time of the COMP is 5 min and 3 min respectively, and
(b) the IFAN can change speed only after it has operated at the same speed for 30 sec.
20
7-2 Heat Mode Operation
(RT - SPT) [oc]
+1
0
-1
-2
-3
H
OFF
L
M
ON
OFF
Note 1 Note 2
COMP
IFAN
RV
ON
OFF
30 sec
The Heat Mode operation is similar to the Cool Mode operation. The COMP, OFAN and IFAN are mainly
controlled by the value of (RT – SPT). In the graph above, the IFAN is operating in Auto Fan speed mode.
Therefore, the IFAN speed changes automatically according to the (RT - SPT).
Note 1: The 30s IFAN operation is for purging the heat from the in-coil after COMP has stopped.
Note 2: The IFAN will not be turned on until the in-coil temperature is high enough (as shown in the
graph below) to prevent the unit from supplying cool air.
IFAN Speed
Any
Low
Stop
30 35 40
ICT [oc]
ICT = In-coil Temperature
Any = Hi, Med or Low fan speed which is
selected by the user. In Auto Fan Speed
Mode, the fan speed is selected by the
unit automatically instead.
Low = The indoor fan is forced to operate at low
speed
21
7-3 Auto (Cool/Heat) Mode Operation
(RT - SPT) [oc]
+2
+1
0
-1
-2
ON
OFF
ON
OFF
COMP
& OFAN
RV
Auto Heat Mode Auto Cool Mode Auto Heat Mode
In Auto Mode, the unit switches between the Auto Cooling Mode and Auto Heating Mode
automatically to maintain the room temperature (RT) at the set point temperature (SPT).
22
7-4 Dry Mode Operation
DRY
(RT - SPT) [
o
C
]
+2
+1
0
-1
-2
ON
OFF
LOW
OFF
DRY-ON
DRY-OFF
Time [min]
10
20
30
40 50
COMP
& OFAN
IFAN
5 minutes COMP
ON time
Max 15 minutes Max 15 minutes 6 min
(Note 2)
3.5 min
(Note 1)
In Dry Mode, the unit operates in a mild cool mode to lower the humidity of the room. In order to
maintain a high efficiency in the drying operation without over lowering the room temperature excessively,
the Dry Mode is different from the Cool Mode in two ways.
1. The IFAN is forced to operate at low speed only. And, the IFAN is turned off with the COMP.
2. The unit operates in either the “Dry-on” state or the “Dry-off” state. If RT = SPT, the unit will operate
in “Dry-off” state. The COMP is forced to operate for 6 min after it has stopped working for 15 min.
If RT > SPT, the unit will operate in “Dry-on” state. The COMP is forced off for 3.5 min after it has
been working for 15 min.
Note 1: COMP is forced off in Dry-on state.
Note 2: COMP is forced to operate in Dry-off state.
7-5 Fan Mode Operation
In Fan Mode, the indoor fan is turned on to improve the air circulation in the room. COMP and OFAN
remain OFF all the time.
Note: If the user has selected the Auto Fan Speed setting, the IFAN speed would be selected by the unit
automatically according to the difference between RT and SPT, as in Cool Mode.
23
7-6 Protection Operations in Cool and Dry Modes
1. Indoor Coil Defrost Protection
The in-coil defrost protection can prevent the ice formation at the in-coil when the ambient
temperature is low.
ICT [oc]
+2
ON
OFF
ON
OFF
t1
t2
t3
COMP
OFAN
+1
+5
0
-1
ON
OFF
IFAN
t1 = 5 min minimum for each COMP starting
t2 = OFAN cycling (alternate between ON and OFF every 30 sec) for 20 min maximum
t3 = COMP and OFAN stop for 10 min minimum
24
2. Outdoor Coil High Pressure Protection
The out-coil high pressure protection prevent the build up of high pressure at the out-coil during cooling
operation.
OCT [oc]
ANY
OFF
ANY
ON
ANY
BLINK
ON
COMP
OFAN
IFAN
OPER
LED
52
55
61
64
L
OFAN follow operation of COMP
COMP is forced OFF
OFAN is forced ON (Note 1)
IFAN is forced LOW
Note 1: In some applications, the outdoor fan and the compressor are controlled together by the COMP
relay output from the controller. In this case, it will take more time for the out-coil to cool down
during the high pressure protection, because the outdoor fan will be turned off with the
compressor instead of working as in the graph above.
25
7-7 Protection Operations in Heat Mode
7-7-1 Outdoor Coil Deice Protection
The deice process is controlled by an Ice Detection Algorithm (IDA). The IDA is an unique control
algorithm incorporated to maintain optimal utilization of the heat pump capacity, especially in below-zero
outdoor temperature condition. The out-coil deicing will be activated not only by static temperature
detection as normally done, but also while ice forming is detected on the out-coil.
COMP to ON
DI = 40 (or 10)
DT = 5
Activate DDt setting
Routine
Start counting TLD
DTF = 0
OCT < DOC ?
DTF=1
&
OCT < DDT
(during last 3 minutes)
&
ICT < 40 deg
Deicer activation
(see Notes)
TLD > DI
&
OCT < DST
(during last 3 minutes)
Deicer activation
(see Notes)
LDT > DT + TimeD
LDT < DT-TimeD
or
LDT < DTmin
DI = TLD - DIT DI = TLD + DIT DI = TLD
Yes
Yes
DI < DImin
DI > DImax
DI = DImax
DI = DImin
DT = LDT
1
1
NoNo
Yes
Yes Yes
No No
Yes
Yes
No
No
DDT and DTF information from Deicing
Dynamic Threshold setting routine
No
26
Explanation:
The “Ice Forming Detection” will be done by two algorithms –
1. In Dynamic Temp Detection, the ice formation will be detected by
(i) Compare the OCT with a Deicing Dynamic Temperature Threshold, and
(ii) Detect the drop in ICT which accompany the ice formation.
2. The Static Temp Detection will be done by comparing the OCT with a Deicing Static Temperature
Threshold.
The Deicing Data Record is used to determine the time delay between two deicing cycles. In general, the
time delay will be increased if the last deicing cycle can be completed quickly.
TLD > TST
AND
SCT > SCD
DDT = OCT - TempD
DTF = 1
IFAN/OFAN
speed change
Reset SCT cnt to 0
DTF = 0
DDT and DTF information
to main algorithm
Reset TLD cnt to 0
DTF = 0
Yes
Yes
No
Yes
No
1st COMP start,
OR deice complete
No
27
7-7-2Indoor Coil High Pressure Protection in Heat Mode
The in-coil high pressure protection prevent the build up of high pressure at the in-coil during heating
operation.
Note:
The operation temperatures shown as A and B in the chart differ by models.
MODEL 1 MODEL 2 MODEL 3
A 50 54 58
B 42 45 49
ICT [oc]
ANY
OFF
ANY
COMP
OFAN
B
A
64
OFF
COMP is forced OFF
28
7-8 Cold Draft Prevention (Heating)
• This function controls indoor fan speed so a strong draft of cold air will not blow out before the indoor heat
exchange coil have sufficiently warmed up.
• When 10 minutes has elapsed, the fan speed is automatically switched to set speed regardless of indoor heat
exchange coil temperature.
Indoor heat exchange
coil temp. (°C)
Max.10 minutes
Tc
Indoor Fan OFF Set Speed
29
7-9 Sleep Function
Room temperature is automatically controlled to compensate for body temperature variations while
sleeping. This mode of operation is designed for maximal comfort in both COOL and HEAT modes.
SPT
Time [Hr]
432
Start
Sleep
7 - 12
RT
SPT-1
SPT-2
SPT-3
SPT+2
SPT+1
SPT+3
1
7-12 Hours Sleep operation
Unit is turned to SB
after Sleep
Cool, Dry modes
Heat mode
7-10 Daily Timer Function
Unit can be programmed to be ON and OFF automatically at preset time everyday, by using a remote
controller. The resolutions of the ON/OFF timers are 10 min.
7-11 IFEEL Function
This feature is provided if the unit is used together with a remote controller with the I-FEEL function.
When this function is selected, the remote controller sends the room temperature measured by its build-in
thermistor to the air con for more accurate temperature control.
7-12 Louver Control
The airflow louver can be driven by either a 12V DC stepping motor or an AC motor. The louver can be
set to operate at auto swing mode or fix position mode.
Three additional features are provided if the louver is controlled by a DC stepping motor.
? Different swing positions (range) for Heat Mode and Cool Mode operation
? Last louver position in fix position mode is stored in the EEPROM, and is restored when the unit is
turned on.
? The louver is closed automatically when the unit is switched to standby mode.
30
7-13 Manual Unit Control and LED indicators
The push button switch and the LED indicators on the display panel let the user to control the unit
operation without a remote controller. Their operations are provided below.
LED indicators:
STAND BY
INDICATOR
1. Lights up when the Air Conditioner is connected to power and
ready to receive the R/C commands
2. Blinks continuously in case of any thermistor failure.
OPERATION
INDICATOR
1. Lights up in operation mode (Note: OFF in standby mode).
2. Blinks for 0.5 sec., to announce that a R/C infrared signal has
been received and stored.
3. Blinks continuously during
? OCT High Pressure Protection Mode
? Deicing in Heating Mode
TIMER INDICATOR
1. Lights up during Timer and Sleep operation.
2. Active On/Off timer setting will become invalid after a power
failure. When this happens, the unit is forced to restart in STBY
mode, and the Timer Indicator is blinked continuously until (i)
the unit is switched to OPER Mode again, or (ii) any message
from the R/C is received.
Push Button switches:
MODE BUTTON
(Cool, Heat, SB)
Use to cycle the operation mode of the A/C unit among COOL,
HEAT and SB modes, without using the R/C.
Every time this switch is pressed, the next operation mode is
selected, in the order :
SB => Cool Mode => Heat Mode => SB => ...
7-14 Recovery from Power Failure
Last unit settings (SPT, operation mode, louver settings, etc) are saved in the EEPROM in the unit. In case
of power failure, these settings are restored automatically.
31
8. TROUBLESHOOTING
8-1. Check before and after troubleshooting
8-1-1. Check power supply wiring.
●
Check that power supply wires are correctly connected to terminals L and N on the terminal plate in the outdoor
unit.
8-1-2. Check inter-unit wiring.
●
Check that inter-unit wiring is correctly connected to the indoor unit from the outdoor unit.
8-1-3. Check power supply.
●
Check that voltage is in specified range (±10% of the rating).
●
Check that power is being supplied.
8-1-4. Check lead wires and connectors in indoor and outdoor units.
●
Check that coating of lead wires is not damaged.
●
Check that lead wires and connectors are firmly connected.
●
Check that wiring is correct.
WARNING
Hazardous voltage can cause ELECTRIC SHOCK or
DEATH. Disconnect power or turn off circuit breaker
before you start checking or servicing.
32
8-2. Air conditioner does not operate.
8-2-1. Circuit breaker trips (or fuse blows).
A. When the circuit breaker is set to ON, it is tripped soon. (Resetting is not possible.)
●
There is a possibility of ground fault.
●
Check insulation resistance.
If resistance value is 2MΩ or less, insulation is defective (“NO”).
Measure insulation
resistance of electrical
parts in outdoor unit.
NO
NO
Set circuit breaker to OFF.
*
Measure insulation
resistance of electrical
parts in indoor unit.
1
Remove inter-unit wires from
terminal plate in outdoor unit.
Measure insulation resistance
of outdoor unit.
•
2
Remove inter-unit wires from
terminal plate in indoor unit.
Measure insulation resistance
of indoor unit.
•
•
•
Insulation of
outdoor unit
is defective.
Insulation of
indoor unit
is defective.
WARNING
33
B. Circuit breaker trips in several minutes after turning the air conditioner on.
●
There is a possibility of short circuit.
8-2-2. Neither indoor nor outdoor unit runs.
A. Power is not supplied.
B. Check "OPERATION selector" switch in the indoor unit.
YES
NO
•
OPERATION selector switch is set
in ON position.
Set OPERATION selector switch
to ON.
Switch Ass'y or indoor PCB Ass'y
is defective.
NO
•
Check power supply.
Power is being supplied to the
outdoor unit.
Circuit breaker
is tripped.
Power failure
Reset breaker.
Wait for recovery
or contact power
company.
Replace with suitable
one (larger capacity).
•
•
•
NO
Check capacity of circuit breaker.
Capacity of circuit breaker is
suitable.
Measure resistance of outdoor fan
motor winding.
Measure resistance of compressor
motor winding.
•
Measure resistance of 4-way valve's
winding.
In case of Heating operation :
34
C. Check remote control unit.
D. Check fuse on the indoor PCB Ass'y.
E. Check TIMER on the remote control unit.
•
Timer is turned ON. Check to see
if is displayed on remote
control.
YES
Cancel the timer mode.
OK
OK
•
Check fuse on indoor PCB Ass'y
for continuity. (F)
•
Check operation lamp to see
if light is ON.
Light is OFF
•
Measure resistance of primary and
secondary winding of transformer.
(TR)
•
Indoor PCB Ass'y or switch Ass'y is
defective.
OK
OK
•
Measure resistance of indoor and
outdoor fan motor winding.
(FMI, FMO)
•
Measure resistance of flap motor
winding. (FLP)
OK
•
Measure resistance of either power
relay or magnetic contactor.
(PR or MG)
•
Replace the fuse.
If fuse has been blown,
OK
•
Try to run with another remote
control unit.
First remote control unit is defective.
•
Check for residue buildup on
transmitter of remote control unit.
•
Check for residue buildup on remote
control receiver on front of indoor
unit.
Clean transmitter.
Clean receiver.
35
8-2-3. Only outdoor unit does not run.
A. Check setting temperature.
B. Check PCB Ass'y in either indoor or outdoor unit.
8-2-4. Only indoor unit does not run.
•
Indoor PCB Ass'y is defective.
•
Indoor PCB Ass'y is defective.
•
Check voltage between terminals
No. 4(+) and No. 5 at terminal plate.
(DC 24V)
No voltage appears.
•
Outdoor PCB Ass'y is defective.
OK
OK
NO
Is room temperature too low ?
Try to lower setting temperature by
temperature setting button ( button).
Outdoor unit still does
not run.
Remote control unit is defective.
•
Try to run using another remote
control unit.
COOL
OK
NO
Is room temperature too high ?
Try to raise setting temperature by
temperature setting button ( button).
Outdoor unit still does
not run.
•
Try to run using another remote
control unit.
HEAT
Remote control unit is defective.
36
8-3. Some part of air conditioner does not operate.
8-3-1. Only indoor fan does not run.
8-3-2. Only flap motor does not run.
•
Measure resistance of flap motor
winding.
Fan cannot
be turned.
OK
•
Check fan rotation.
Turn fan gently once or twice by
hand.
•
Check fan casing
foreign matter on
inside.
Fan motor burnout
or foreign matter in
bearings.
Remove foreign
matter or repair.
Repair or replace.
•
Measure resistance of indoor fan
motor winding.
•
Check fan motor capacitor.
37
8-3-3. Only outdoor fan does not run.
8-3-4. Only compressor does not run.
NO
YES
YES
YES
•
Measure coil resistance of
starting relay.
•
Measure resistance of
compressor motor winding.
•
Check capacitors.
•
Either overload relay or
internal protector is working.
YES
•
Temperature of compressor
is abnormally high.
Refrigerant gas shortage. Charge refrigerant gas (R22).
Rotor may be locked up.
•
Measure coil resistance of
power relay. (PR)
Fan cannot
be turned.
OK
•
Check fan rotation.
Turn fan gently once or twice by
hand.
•
Check fan casing
foreign matter on
inside.
Fan motor burnout
or foreign matter in
bearings.
Remove foreign
matter or repair.
Repair or replace.
•
Measure resistance of outdoor fan
motor winding.
•
Check fan motor capacitor.
38
8-4. Air conditioner operates, but abnormalities are observed.
8-4-1. Operation does not switch from HEAT to COOL (or COOL to HEAT).
•
Indoor PCB Ass'y is defective.
•
Check voltage between terminals
No. 4(+) and No. 6 at terminal plate.
No voltage appears.
Outdoor PCB Ass'y is defective.
OK
•
Remote control unit may be defective.
•
Measure resistance of 4–way valve's
winding. (20S)
Receiver in lamp Ass'y may be
defective.
Cool ➞ Heat
•
Check voltage between terminals
No. 4(+) and No. 6 at terminal plate.
(0V)
HEAT ➞ COOL
39
8-4-2. Poor cooling or heating.
8-4-3. Excessive cooling or heating.
NO
NO
•
Set temperature is suitable.
Set temperature to higher or
lower value using temperature
setting buttons of the remote
control unit.
•
Remote control unit is placed where
it can detect room temperature
properly.
Change position of remote
control unit.
Air filter is clogged.
NO
YES
Temperature
difference
is small.
YES
Temperature difference between
suction and discharge air is
large enough (approx. 10 deg. or more).
Possibility of
gas shortage.
YES
•
Check position of remote control unit.
Cool or warm air from air conditioner
reaches position directly.
•
Change position of remote
control unit.
•
Wide and narrow tubes between
indoor unit and outdoor unit are
insulated.
Insulate both wide and narrow
tubes separately and then
tape together.
•
Measure temperature of suction and
discharge air of air conditioner.
Charge refrigerant
gas (R22).
Check for clogging of air filter.
•
Fan speed is set to LOW.
Clean filter.
Set fan speed to either
HIGH or MEDIUM.
•
Review cooling load estimate,
if performance of air conditioner is
normal.
Reduce cooling or heating
load or replace the air
conditioner with larger
capacity.
40
8-5. If a sensor is defective.
8-5-1. Indoor coil temp. thermistor is defective.
Alarm Signal (*)
Operation lamp on the front side of the indoor unit will flash on and off when the indoor coil thermistor is defective.
At the same time the outdoor unit will stop. Indoor unit will operate only for ventilation.
8-5-2. Room temp. thermistor is defective.
A. Open
When thermistor opens, the air conditioner will be in the following conditions as the
controller tries to detect extremely low room temperature.
a) In Cooling mode: The air conditioner soon stops and will not start again.
(Thermo.OFF) Neither outdoor fan nor compressor runs.
b) In Heating mode: The air conditioner continues to operate (Thermo.ON). Both
the outdoor fan and compressor do not stop. As a result, the
room becomes too warm.
B. Short
When thermistor is short, the air conditioner will be in the following conditions as
the controller tries to detect extremely high room temperature.
a) In Cooling mode: The air conditioner continues to operate (Thermo.ON). Both
the outdoor fan and compressor do not stop. As a result, the
room becomes too cold.
b) In Heating mode: The air conditioner soon stops and will not start again
(Thermo.OFF). Neither outdoor fan nor compressor runs.
Definition of Open or Short Circuit of Sensor (Thermistor)
Open ... A lead wire is broken or disconnected or the circuit inside the temperature sensor is open .
Short ... The protective cover of a lead wire has been damaged, and the exposed wire is touching another metal
part, or both lead wires have become exposed and are touching each other. Alternatively, the circuit
inside the temperature sensor is closed.
NOTE
NOTE
•
Operation lamp on front side of
indoor unit is flashing on and off. (*)
YES
•
Replace thermistor.
•
Thermistor (TH1 ) is defective.
YES
Temperature
sensor
Lead
wires
Thermistor Structure
41
9-1. Measurement of Insulation
Resistance
●
The insulation is in good condition if the resistance
exceeds 2MΩ.
9-1-1.Power Supply Wires
Clamp the ground wire of the power supply wires with
the lead clip of the insulation resistance tester and
measure the resistance by placing a probe on either of
the power wires. (Fig. 1)
Then measure the resistance between the ground wire
and the other power wire. (Fig. 1)
9-1-2.Indoor Unit
Clamp an aluminum plate fin or copper tube with the
lead clip of the insulation resistance tester and
measure the resistance by placing a probe on each
terminal screw on the terminal plate. (Fig. 2)
Note that the ground line terminal should be skipped
for the check.
9-1-3.Outdoor Unit
Clamp a metallic part of the unit with the lead clip of
the insulation resistance tester and measure the
resistance by placing a probe on each terminal screw
where power supply lines are connected on the
terminal plate. (Fig. 2)
9-1-4.Measurement of Insulation
Resistance for Electrical Parts
Disconnect the lead wires of the desired electric part
from terminal plate, capacitor, etc. Similarly disconnect
the connector. Then measure the insulation resistance.
(Figs. 3 and 4)
Refer to Electric Wiring Diagram.
If the probe cannot enter the poles because the hole is
too narrow then use a probe with a thinner pin.
NOTE
9. CHECKING ELECTRICAL COMPONENTS
Insulation
tester
Probe
Clip
Ground wire
Terminal plate
Copper
tube or
metallic part
Clip
Insulation
tester
Probe
Copper
tube or
metallic part
Clip
Insulation
tester
Probe
Clip
Insulation
tester
Probe
Metallic
part
From fan motor,
compressor and
other parts
Fig. 1
Fig. 2
Fig. 3
Fig. 4
42
9-2. Checking Continuity of Fuse
on PCB Ass'y
●
Remove the PCB Ass’y from the electrical
component box. Then pull out the fuse from the PCB
Ass’y. (Fig. 5)
●
Check for continuity using a multimeter as shown in
Fig. 6.
9-3. Checking Motor Capacitor
Remove the lead wires from the capacitor terminals,
and then place a probe on the capacitor terminals as
shown in Fig. 7. Observe the deflection of the pointer,
setting the resistance measuring range of the
multimeter to the maximum value.
The capacitor is “good” if the pointer bounces to a
great extent and then gradually returns to its original
position.
The range of deflection and deflection time differ
according to the capacity of the capacitor.
Fuse
PCB Ass’y
Fuse
Compressor motor
capacitor
Fan motor
capacitor
Multimeter
Fig. 5
Fig. 6
Fig. 7
43
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