Technibel GR120R, GR127R, MCA127R, MCA135R, MCA120R Technical Data & Service Manual

TECHNICAL DATA & SERVICE MANUAL

Indoor Unit Outdoor Unit

MCA120R GR120R
MCA127R GR127R
MCA135R GR135R

SPLIT SYSTEM AIR CONDITIONER

0.8180.179.0 03/2001

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
units 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

Table of Contents

Page

1 OPERATING RANGE 1
2 SPECIFICATIONS 2

2-1 Unit Specification 2
2-2 Indoor Unit 3
2-3 Outdoor Unit 4
2-4 Other Component Specifications 5

3 DIMENSIONAL DATA 6

3-1 Indoor Unit 6

3-2 Outdoor Unit 7
4 REFRIGERANT FLOW DIAGRAM 8
5 PERFORMANCE DATA 9

5-1 P Air Throw Distance Chart 9

5-2 Cooling Capacity 10

5-3 Heating Capacity 13
6 ELECTRICAL DATA 14

6-1 Electrical Characteristic 14

6-2 Electric Wiring Diagrams 15
7 FUNCTION 16

7-1 Cool Mode Operation 16

7-2 Heat Mode Operation 17

7-3 Auto Cool/Heat mode operation 18

7-4 Dry Mode Operation 19

7-5 Protection Operation in Cool and Dry Operation Mode 20

7-6 Protection Operation in Heat Mode) 22

7-7 Cool Draft Prevention (Heating 25

7-8 Others Features 26
8 TROUBLESHOOTING 28

8-1 Check before and after troubleshooting 28

8-2 Check Power Supply Wiring 28

8-3 Check Indoor Unit Wiring 28

8-4 Check Power Supply 28

8-5 Check Lead wires and Connector in Indoor and Outdoor Units 28

8-6 Air Conditioner Does not work 29

8-7 Some Parts of Air Conditioner does not operate 32

8-8 Air Conditioner operates, but abnormalities are observed 34

8-9 If a Sensor is defective 35
9 CHECKING ELECTRICAL COMPONENTS 36

9-1 Measure of insulation Resistance 36

9-2 Check Continuity for Electrical Parts 36

9-3 Checking Motor Capacitor 37

1.OPERATING RANGE

Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.

Maximum 32°C D.B. / 23°C W.B. 43°C D.B.

Cooling

Minimum 19°C D.B. / 14°C W.B. 19°C D.B.

Maximum 27°C D.B. 24°C D.B. / 18°C W.B.

Heating

Minimum 16°C D.B. -5°C D.B. / -6°C W.B.

DB-Dry Bulb
WB-Wet Bulb

2.SPECIFICATIONS

2-1 Unit Specification

Indoor Unit

MCA120R MCA127R MCA135R

Model Unit

Outdoor Unit

GR120R GR127R GR135R

Voltage Rating 230 V – 50 Hz
Performance

W 2000 2300 2450 2800 3150 3550

Capacity Cooling / Heating

BTU/h

6820 7840 8350 9550 10740 12100

Air Circulation Hi-Me-Low

m3/hr 280 320 420 280 320 420 300 350 450

Moisture Removal Liters/h

0.5 0.8 1.1

Electrical Rating

Running Amperes A 3.2 3.3 4.0 4.0 5.5 5.7
Power Input W 700 720 850 850 1150 1250
Power Factor % 95 95 92 92 90 91
C.O.P W/W 2.86 3.19 2.88 3.29 2.74 2.96
Compressor locked rotor amperes A

20 24 30

Features

Controls / Temperature Control

Microprocessor / I.C. thermostat

Control Units

Wireless remote control unit

Timer

24 hr ON o OFF

Fan Speed Indoor/Outdoor

3-Auto / 1

Horizontal

Manual

Air Flow Direction (indoor)

Vertical

Auto

Air Filter

Washable, Anti-Mold

Compressor

Rotary ( Hermetic )

Refrigerant/Amount charged at shipment g

R22-690 R22-650 R22-690

Refrigerant Control Capillary

Indoor: hi / Me / Lo dB-A 39 33 28 40 35 31 42 38 34

Operation Sound

Outdoor: Cool/Heat dB-A

38 40 37 40 37 40
Refrigerant Tubing Connections Flare
Max Allowable tubing length at shipment mt

7.5

Narrow tube mm (in)

6.35 (1/4”) Refrigerant tube

diameter

Wide tube mm (in)

9.52 (3/8”) 9.52 (3/8”) 12.7 (1/2”)

Lenght mt

10 10 15

Max allowable tubing

Refrigerant

g/m

15 15 15

Dimensional & Weight Indoor Unit Outdoor Unit

Height mm

270 540

Width mm

805 700

Unit dimensions

Depth mm

181 265

Height mm

343 585

Width mm

855 830

Package dimensions

Depth mm

232 360

Net Kg

8 35 36 38

Weight

Shipping Kg

10 38 39 41

Shipping volume m

3

0.07 0.18
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.
Outoor air temperature 7 °C D.B. / 6 °C W.B.

2-2 Indoor Unit

Model Unit

MCA120R MCA127R MCA135R

Controller PCB

Part No

WSA-LTR
Controls Microprocessor
Control circuit fuse 250 V – 3.15 A

Remote Control Unit

Fan & Fan Motor

Type

Cross-Flow

Q.ty….Dia. and length mm

1- θ 95 / 617

Fan motor model….Q.ty

KFV4Q-11HP-S-----------1

No of poles…rpm (230V,hi)

4-----1160 4-----1160 4------1250

Nominal output W

10

BRN-WHT

561.8

VLT-WHT

197.4

VLT-ORG

63.4

YEL-ORG

155.7

Coil Resistance (Ambient Temp.)

YEL-PNK

115.9

Safety device Type

Internal Fuse

Open °C

145 +/-5

Operating temp.

Close °C

-

µf

0.6 0.6 0.8

Run capacitor

Vac 400 400 400

Flap Motor

Type

Stepping Motor
Model MP24GAI
Rating 12 VDC
Coil resistance (Ambient temp 25°C) ohm

380

Heat Exch.Coil

Coil

Aluminium plate fin/ Copper tube
Rows 2
Fin pitch mm

1.6

Face area m

2

0.13

DATA SUBJECT TO CHANGE WITHOUT NOTICE

2-3 Outdoor Unit

Model Unit

GR120R GR127R GR135R

Compressor

Type

Rotary (Hermetic)
Compressor model mm RH130VHAT RH154VHAT RH189VHAF
Nominal output
Compressor oil Diamond MS 56 ….Amount cc

300 300 520

Coil resistance (Ambient temp 25°C)+/- 7% cr

Ω

4.26 3.5 2.64

cs

Ω

5.87 5.55 4.02

Safety device Type
Overload relay
Operating temp Open °C

150 +/-5 150 +/-5 155 +/-5

Close °C

90 +/-10 90 +/-10 90 +/-10
Operating amp(Ambient temp 25°C) ­Run capacitor

µF

25 25 30

VAC

450 450 450

Grank case heater

Fan & Fan Motor

Type

Propeller

Q.ty….Dia. and length mm

1------θ 370

Fan motor model….Q.ty

K35610-M01723-------1

No of poles…rpm (230V,hi)

6------820

Nominal output W

22

Ω

BRN-WTH 374 +/- 7%

Ω

PNK-BRN 484 +/-7%

Coil Resistance (Ambient Temp.20°C)

-

Safety device Type

Internal protector

Open °C

150 +-10

Operating temp.

Close °C

Auto

µf

1.5

Run capacitor

Vac 400

Heat Exch.Coil

Coil

Aluminium Plate fin / Copper tube
Rows 1
Fin pitch mm

1.6 1.6 1.2

Face area m

2

0.35

External Finish

Acrylic baked-on enamel finish

DATA SUBJECT TO CHANGE WITHOUT NOTICE

2-4 Other Component Specifications

¢ Indoor unit

Transformer (TR) TPN41-0001

Primary

230V 50HZ

Secondary

12 V 300mA Rating
Capacity
Ω (at 21°C)

Primary 495

Coil resistance

Secondary 2.86

Thermal cut -off temp.

125°C

Thermistor (Coil sensor) NTC - TERMISTOR

Resistance

KΩ

10 at 25°C

Thermistor (Room sensor)
Resistance

KΩ

¢ Outdoor Unit

4-Way Valve (Solenoid coil) CHV01A(coil) CHV -0101 (valve)

Coil rating

230V-50HZ

Coil resistance

KΩ

1.430 +/- 7%

Thermostat ( Defrost thermo ) NTC - TERMISTOR

Operating Temp °C

–2 / 15 +/-2 ON

Resistance

KΩ

10 at 25°C

3.DIMENSIONAL DATA

3-1 Indoor Unit

3-2 Outdoor Unit

4.REFRIGERANT FLOW DIAGRAM

5.PERFORMANCE

5-1 Air Throw Distance Chart

COOLING

Room ir temp : 27°C
Fan Speed : High

Horizontal distance (m)

1

2 3 4 5 6 7 8 9

1

2

3

4

Axis Air Velocity (m/s)

Vertical distance (m)

• Axis air velocity

0°

• Flap angle

30°

HEATING

Room ir temp : 20°C
Fan Speed : High

Horizontal distance (m)

1

2 3 4 5 6 7 8 9

1

2

3

4

Axis Air Velocity (m/s)

Vertical distance (m)

• Axis air velocity

45°

• Flap angle

60°

COOLING

Room ir temp : 27°C
Fan Speed : High

Horizontal distance (m)

1

2 3 4 5 6 7 8 9

1

2

3

4

Axis Air Velocity (m/s)

Vertical distance (m)

• Axis air velocity

0°

• Flap angle

30°

HEATING

Room ir temp : 20°C
Fan Speed : High

Horizontal distance (m)

1

2 3 4 5 6 7 8 9

1

2

3

4

Axis Air Velocity (m/s)

Vertical distance (m)

• Axis air velocity

45°

• Flap angle

60°

5-2 Cooling Capacity

Indoor Unit MCA127R
Otdoor Unit GR127R

230 V Single Phase 50 HZ

RATING CAPACITY 2.45kW
AIR FLOW RATE 420m³/h

EVAPORATOR CONDENSER
ENT.TEMP. °C OUTDOOR AMBIENT TEMP. °C

W.B. D.B. 25 30 35 40 43
TC 2,32 2,25 2,15 2,01 1,86
CM 0,70 0,75 0,80 0,88 0,96

21 SHC 1,59 1,56 1,51 1,44 1,37
23 SHC 1,80 1,77 1,72 1,65 1,58

15 25 SHC 2,01 1,97 1,92 1,85 1,78

27 SHC 2,22 2,18 2,13 2,01 1,86
29 SHC 2,32 2,25 2,15 2,01 1,86

31 SHC 2,32 2,25 2,15 2,01 1,86
TC 2,51 2,42 2,30 2,16 1,99
CM 0,72 0,77 0,82 0,91 0,98

21 SHC 1,39 1,35 1,30 1,24 1,16

23 SHC 1,60 1,56 1,50 1,44 1,36

17 25 SHC 1,81 1,76 1,71 1,65 1,57

27 SHC 2,02 1,97 1,91 1,85 1,77

29 SHC 2,24 2,17 2,12 2,06 1,98

31 SHC 2,44 2,38 2,30 2,16 1,99
TC 2,66 2,57 #2,45 2,30 2,12
CM 0,75 0,79 0,85 0,93 1,01

21 SHC 1,17 1,13 1,08 1,01 0,94

23 SHC 1,37 1,34 1,28 1,22 1,15

19 25 SHC 1,57 1,54 1,49 1,43 1,35

27 SHC 1,77 1,75 1,69 1,63 1,56

29 SHC 1,97 1,95 1,90 1,84 1,76

31 SHC 2,18 2,16 2,10 2,04 1,97
TC 2,82 2,73 2,60 2,44 2,25
CM 0,77 0,81 0,88 0,96 1,04

23 SHC 1,15 1,11 1,06 1,00 0,92

21 25 SHC 1,35 1,32 1,27 1,20 1,13

27 SHC 1,55 1,52 1,47 1,41 1,33

29 SHC 1,75 1,73 1,68 1,61 1,54

31 SHC 1,96 1,93 1,88 1,82 1,75
TC 3,01 2,89 2,73 2,55 2,38

CM 0,78 0,83 0,90 0,98 1,07

23 25 SHC 1,13 1,08 1,02 0,96 0,89

27 SHC 1,32 1,28 1,23 1,16 1,10

29 SHC 1,52 1,49 1,43 1,37 1,30

31 SHC 1,74 1,70 1,64 1,57 1,51

TC : Total Cooling Capacity KW
SHC : Sensible Heat Capacity KW
CM : Compressor Input KW
Rating Condition (#Mark) are
Outdoor Ambient Temperature 35°C D.B.
Indoor Unit Entering Air Temp 27°C D.B / 19°C W.B.

Indoor Unit MCA135R
Otdoor Unit GR135R

230 V Single Phase 50 HZ

RATI NG CAPACITY

3.15 kW

AIR FLOW RATE 450 m³/h

EVAPORATOR CONDENSER
ENT.TEMP. °C OUTDOOR AMBIENT TEMP. °C
W.B. D.B. 25 30 35 40 43

TC 2,99 2,90 2,76 2,59 2,39
CM 0,95 1,01 1,09 1,19 1,30
21 SHC 2,05 2,01 1,94 1,86 1,76
23 SHC 2,32 2,27 2,21 2,12 2,03

15 25 SHC 2,59 2,53 2,47 2,38 2,29

27 SHC 2,86 2,80 2,73 2,59 2,39
29 SHC 2,99 2,90 2,76 2,59 2,39
31 SHC 2,99 2,90 2,76 2,59 2,39
TC 3,23 3,11 2,96 2,78 2,56
CM 0,97 1,04 1,11 1,23 1,33
21 SHC 1,79 1,74 1,67 1,59 1,49
23 SHC 2,06 2,00 1,93 1,85 1,75

17 25 SHC 2,33 2,27 2,20 2,12 2,01

27 SHC 2,60 2,53 2,46 2,38 2,28
29 SHC 2,88 2,79 2,73 2,64 2,54
31 SHC 3,14 3,05 2,96 2,78 2,56
TC 3,42 3,31 #3,15 2,96 2,73
CM 1,02 1,07 1,15 1,26 1,37
21 SHC 1,50 1,45 1,38 1,30 1,21
23 SHC 1,76 1,72 1,65 1,57 1,47

19 25 SHC 2,02 1,98 1,91 1,84 1,73

27 SHC 2,28 2,25 2,18 2,10 2,00
29 SHC 2,53 2,51 2,44 2,36 2,26
31 SHC 2,80 2,77 2,70 2,62 2,53
TC 3,63 3,51 3,34 3,14 2,89
CM 1,04 1,10 1,19 1,30 1,41
23 SHC 1,48 1,43 1,36 1,28 1,18

21 25 SHC 1,73 1,69 1,63 1,55 1,45

27 SHC 2,00 1,96 1,89 1,81 1,71
29 SHC 2,25 2,22 2,16 2,07 1,98
31 SHC 2,52 2,49 2,42 2,34 2,25
TC 3,88 3,71 3,51 3,28 3,05
CM 1,06 1,13 1,21 1,33 1,44

23 25 SHC 1,45 1,39 1,31 1,23 1,15

27 SHC 1,70 1,65 1,58 1,49 1,41
29 SHC 1,96 1,92 1,84 1,76 1,68
31 SHC 2,24 2,18 2,10 2,02 1,94

TC : Total Cooling Capacity KW
SHC : Sensible Heat Capacity KW
CM : Compressor Input KW
Rating Condition (#Mark) are
Outdoor Ambient Temperature 35°C D.B.
Indoor Unit Entering Air Temp 27°C D.B / 19°C W.B.

5-3 Heating Capacity

120

110

100

90
80

Heating capacity ratio

(%)

70
60
50
40
30
20
10

0

-8

-5

0

5 7 10

15

Outdoor temperature ( °C D.B.)

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

no 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 (h

eat pump system),the heating efficiency will fall

when the outdoor temperature is very low. If sufficient heat cannot

be obtained with this air conditioner, user another heating

appliance in conjunction with it.

• Point of Rating Condition

6.ELECTRICAL DATA

6-1 Electrical Characteristics

COOLING

Indoor Unit Outdoor Unit

Fan Motor Fan Motor Compressor

Complete Unit

Performance at 230 V – 50 Hz
Rating Conditions Running Amps. A

0.14 0.14 0.14 0.25 0.25 0.25 0.28 3.6 5.1 3.2 4 5.5

Power Input KW

27 27 29 56 56 56 617 767 1065 700 850 1150

Full Load Conditions Running Amps A

0.14 0.14 0.14 0.25 0.25 0.25 3.3 4.1 5.5 3.7 4.5 5.9

Power Input KW

27 27 29 56 56 56 717 927 1165 800 1010 1250

Rating Condition : Indoor air Temperature 27°C D.B. / 19°C W.B.
Outdoor Air T emperature 35 °C D.B.
Full Load condition : Indoor Air Temperature 32 °C D.B. / 23 °C W.B.
Outdoor Air Temperature 4.°C D.B.

HEATING

Indoor Unit Outdoor Unit

Fan Motor Fan Motor Compressor

Complete Unit

Performance at 230 V – 50 Hz
Rating Conditions Running Amps. A

0.14 0.14 0.14 0.25 0.25 0.25 2.9 3.6 5.3 3.3 4 5.7

Power Input KW

27 27 29 56 56 56 717 767 1115 720 850 1200

Full Load Conditions Running Amps A

0.14 0.14 0.14 0.25 0.25 0.25 3.3 4.1 5.5 3.7 4.5 5.9

Power Input KW

27 27 29 56 56 56 717 927 1165 800 1010 1250

Rating Condition : Indoor air Temperature 20°C D.B
Outdoor Air Temperature 7 °C D.B./ 6°C W.B.
Full Load condition : Indoor Air Temperature 27 °C D.B.
Outdoor Air Temperature 24.°C D.B. / 18°C W.B.

GR120R - GR127R - GR135R

GR120R - GR127R - GR135R

6-2 Electric Wiring Diagrams

WARNING

To avoid electrical shock hazard, be
sure to disconnect power before
checking, servicing and/or cleaning
any electrical parts

Legend

CM

Compressor Motor

C1,C2,C3

Capacitor

FLP

Louvers Motor

FMO

Outdoor Fan Motor

FMI

Indoor Fan Motor

REC ASSY

Remote Control

PCB1

Indoor PC board

TH1,TH2

Thermistor

TP1,TP2

Terminal Plate

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.

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

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).

7-4 Dry Mode Operation

DRY

(RT - SPT) [oc]

+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.

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

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.

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

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

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.

MCA120R MCA127R

MCA135R

A 50 54 58
B 42 45 50

ICT [oc]

ANY
OFF

ANY

COMP

OFAN

B

A

64

OFF

COMP is forced OFF

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

NOTE

• The operation temperature shown as Tc in the chart differ by models.

MCA120R

MCA135R

Tc 32 32 34

MCA127R

7-9-1 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

7-9-2 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.

7-9-3 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.

7-9-4 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.

7-9-5 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 => ...

7-9-6 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.

8.TROUBLESHOOTING

8-1 Check before and after troubleshooting

8-2 Check power supply wiring

• Check that power supply wires are connected to terminals L and N on the terminal plate in the indoor unit.

8-3 Check indoor unit wiring

• Check that inter-unit wiring is correctly connected to the outdoor unit from the indoor unit

8-4 Check power supply

• Check that voltage is in specified range (+/- 10% of the rating)

• Check that power is being supplied.

8-5 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 ELECTRICAL SCHOCK

or DEATH. Disconnect power or turn off circuit
breaker before you start checking or servicing.

8-6 Air Conditioner does not operate

8-6-1 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 possibility of ground fault

• Check insulation resistance

If resistance value is 2MΩor less, insulation is defective ( “NO”)

WARNING

1 Remove inter

-

unit wires

from

terminal platea in outdoor unit

• Mesaure insulation resistance of
outdoor unit.

2 Remove

inter

-

unit wires from

terminal plate un outdoor unit.
Then, pull the power plug out of
the wall outlet.

• Measure insulation resistance of
indoor unit

Insulation of

outdoor unit is
defective

Insulation of

indoor unit is
detective.

NO

NO

• Measure insulation
resiatance of elec

tical parts

in outdoor unit.

• Measure insulation

resiatance of electical parts

in indoor unit.

B. Circuit breaker trips in several minutes after turning the air conditioner on.

• There is a possibility of short circuit

8-6-2 Neither indoor nor outdoor unit runs

A. Power is not supplied

B. Check “Push bottom” selector in the indoor unit.

C. Check remote control unit

• Check capacity of circuit
breaker.
Capacity of circuit breaker is

suitable.

• Measure resistance of outdoor
fan motor winding

• Measure resisatnce of
compressormotor winding

Replace with suitable one

(lager capacity)

• Measure resistance of 4-way
valve’s winding

In case of Heating operation:

NO

• Try to run with another remote
control unit.

First remote control unit is detective.

OK

• 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 Re

ceiver.

• Check power supply.
Power is being supplied to the

indoor unit

Circuit breaker i

tripped

Power failure

Reset breaker

Wait for recovery

or contact power
company

• Push the button switch under the
indoor unit pannel.

The indoor unit

and outdoor unit
doesn’t runs

Indoor PCB Ass’y

is defective

D. Check fuse on the indoor PCB Ass’y

E. Check TIMER on the remote control unit

8-6-3 Only outdoor unit does not run

A Check setting temperature

COOL HEAT

• Indoor PCB Ass’y is detective.

• Measure resistance of primari

and secondary winding of
transformer

• Check operation lamp to see if

light is ON

• Check fuse on indoor PCB

Ass’y for continuity

• Replace the fuse

• Measure coil resistance of power

relay in outdoor unit.

• Measure resistance of
compressor motor winding

• Measure resistance of indoor
and outdoor fan motor winding

• Timer i turned On.Check to see
if is displayed on remote control

• Cancel the timer mode push the
buttom CLEAR

OK

OK

OK

Light is OFF

YES

Is room temperature too low?

• Remote control unit is defective

• Try to use another remote

control unit

Try to lower setting temperature by

temperature setting button

Outdoor unit still does

not run

Is room temperature too high?

• Remote control unit is defective

• Try to use another remote

control unit

Try to raise setting temperature by

temperature setting button

Outdoor unit still does

not run

NOOKNO

OK

B Check PCB Ass’y in either indoor or outdoor unit

8-6-4 Only indoor unit does not run

8-7 Some part of air conditioner does not operate

8-7-1 Only indoor fan does not run

8-7-2 Only flap motor does not run

• Indoor PCB Ass’y is defective

• Indoor PCB Ass’y is defective

• 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

OK

• Measure resistance of flap motor
winding

Fan cannot

be turned

8-7-3 Only outdoor fan does not run

8-7-4Only compressor does not run

• 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

OK

Fan cannot

be turned

• Check compressor motor
capacitor (C1)

• Measure resistance of
compressor motor winding

Temperatur

e of compressor

is abnormally high.

Overload Klixon is working

Refigerant gas shortage

Rotor may be locked up

Recover refrigerant

Evacuate the air

conditioner

Charge refrigerant.

Replacement compressor

• Measure power supplì voltage.
The voltage is too low

• Measure winding resistance of
power relay

YES

YES

YESNOYES

NO

8-8 Air conditioner operates, but abnormalities are observed

8-8-1 Operation does not switch from HEAT to COOL (or COOL to HEAT).

COOL4 HEAT

HEAT4 COOL

• Remote control unit may be

detective.

• Measure resistance of 4-way

valve’s winding

Reciver in lamp Ass’y may be

detective.

• Check voltage between terminals

No.1 and N, must be 230 VAC

• Indoor PCB Ass’y is defective

Check wiring connection

• Check voltege between terminals

No. 1 and N, must be 0 Volt

OK

No voltage appears

8-9 If a sensor is defective

8-9-1 ICT (indoor coil sensor) OCT(outdoor coil sensor) RAT (room ambient temperatur) are defetive.

NOTE Allarm signal (*)

Stan by lampoon the front side of the indoor unit will flash on and off when the thermistor is defective.
At the same time the outdoor unit will stop. Indoor operate only for ventilation.

Temparature sensor

Lead wires

• Stand by lamp on front side of indoor

unit is flashing on and off. (*)

• Thermistor ICT and OCT and RAT are
defective

• Repalce thermistor.

YES

YES

9.CHECKING ELECTRICAL COMPONENTS

9-1 Measurement of Insulatipon Resisatnce

The insulation is good condition if the resistance
exceeds 2MΩ

9-1-1Power Supply Wires

Clamp the grounding terminal of the power plug with a
lead clip of the insulation resistance tester and measure
the resistance by placing a probe on either of the two
power terminals.(Fig 1)

Then, also measure resistance between the grounding
and other power terminals (Fig 1)

9-1-2 Indoor Unit

Clamp an aluminium plate fin or copper 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)

9-1-3 Outdoor Unit

Clamp an aluminium plate fin or copper 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 ground line terminal should be skipped

9-2 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.
(Fig 3 and 4)

NOTE

Refer to Electric Wiring Diagram

If the probe cannot enter the poles because the hole is
too narrow the use a probe with a thinner pin

NOTE

The shape of the power plug may differ from that of the
air conditioner which you are servicing.

Fig. 2

Fig. 3

Fig. 4

9-2-1 Measurement continuity of the Fuse

The fuse is situated on Indoor PCB Ass’y (Fig 5)

Disconnect the fuse from PCB Ass’y. Then check if there
is continuity on the fuse(Fig 6)

9-2-2 Measure the Capacity of the Run
Capacitor

Disconnect the lead wires of the desired electric part
from terminal plate. Similarly disconnect the connector.
Then measure the capacity. (Fig 7)

Fig. 5

Fig. 6

Fig. 7

S.A.C. - olgiate olona - printed in italy

R.D. 28 Reyrieux BP 131 - 01601 Trévoux CEDEX France

Tél. [phone] - Fax [phone]

R.C.S. Bourg-en-Bresse B 759 200 728