Electra LEX 25 DCI, LEX 60 DCI, DCI 25, DCI 35, DCI 50 Service Manual

LEX DCI Series

CONTENTS

Indoor Units Outdoor Units

LEX 25 DCI DCI 25
LEX 35 DCI DCI 35
LEX 50 DCI DCI 50
LEX 60 DCI DCI 60
LEX 72 DCI DCI 72Z

REFRIGERANT

SM LEXDCI 1-E.1 GB

R410A

HEAT PUMP

NOVEMBER – 2008

LIST OF EFFECTIVE PAGES

CONTENTS

LIST OF EFFECTIVE PAGES

Note: Changes in the pages are indicated by a “Revision#” in the footer of each effected page

(when none indicates no changes in the relevant page). All pages in the following list represent
effected/ non effected pages divided by chapters.

Dates of issue for original and changed pages are:

Original ....... 0 ........September 2007

Total number of pages in this publication is 107 consisting of the following:

Page
No.

Title ....................... 1

A ........................... 1

i ............................. 1

1-1 - 1-4 ................ 1

2-1 - 2-4 ................ 1

3-1 ........................ 1

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11-1 ....................... 1

12-1-12-23 ............ 1

13-1-13-18 ............ 1

14-1-14-12 ............ 1

15-1-15-10 ............ 1

Appendix -A ...........1

Revision
No. #

Page
No.

Revision
No. #

Page
No.

Revision
No. #

● Zero in this column indicates an original page.

*Due to constant improvements please note that the data on this service manual can be modified
with out notice.
**Photos are not contractual

A

SM LEXDCI 1-E.1 GB

TABLE OF CONTENTS

Table of Contents

1. INTRODUCTION ...................................................................................................1-1

2. PRODUCT DATA SHEET ......................................................................................2-1

3. RATING CONDITIONS ..........................................................................................3-1

4. OUTLINE DIMENSIONS .......................................................................................4-1

5. PERFORMANCE DATA & PRESSURE CURVES ...............................................5-1

6. SOUND LEVEL CHARACTERISTICS ..................................................................6-1

7. ELECTRICAL DATA ..............................................................................................7-1

8. WIRING DIAGRAMS .............................................................................................8-1

9. REFRIGERATION DIAGRAMS .............................................................................9-1

10. ELECTRICAL CONNECTIONS .............................................................................10-1

11. CONTROL SYSTEM for LEX 25 / 35 DCI ............................................................11-1

12. CONTROL SYSTEM for LEX 50 / 60 / 72 Z DCI ..................................................12-1

13. TROUBLESHOOTING ..........................................................................................13-1

14. EXPLODED VIEWS AND SPARE PARTS LISTS .................................................14-1

15. TUBING CONNECTIONS ......................................................................................15-1

16. APPENDIX A .........................................................................................................16-1

SM LEXDCI 1-E.1 GB

i

1. INTRODUCTION

CONTENTS

1.1 General

The new LEX DCI INVERTER split wall mounted range has expanded, comprising the
following RC (heat pump) models:

● LEX 25 DCI

● LEX 35 DCI

● LEX 50 DCI

● LEX 60 DCI

● LEX 72 DCI

The indoor LEX units are available as LED display types, featuring esthetic design,
compact dimensions, and low noise operation.

INTRODUCTION

1.2 Main Features

The LEX DCI series benefits from the most advanced technological innovations,
namely:

● DC inverter technology.

● R410A.

● High COP.

● Lego concept.

● Pre-Charged units up to the max’ allowing tubing distance.

● Networking system connectivity.

● A dry contact for clock or power shedding functions (configurable).

● Base heater connection.

● Cooling operation at outdoor temperature down to -10°C.

● Heating operation at outdoor temperature down to -15°C.

● Supports Indoor Air Quality features, such as – Ionizer and Active Electrostatic Filter.

● Indoor large diameter cross flow fan, allowing low noise level operation.

● Bended indoor coil with treated aluminum fins and coating for improved efficiency.

SM LEXDCI 1-E.1 GB

● Easy access to the interconnecting tubing and wiring connections, so that removing
the front grill or casing is not necessary.

● Refrigerant pipes can be connected to the indoor unit from 5 different optional
directions.

● Water condensate tray is equipped with two optional drain connections

● Automatic treated air sweep.

● Low indoor and outdoor noise levels.

● Easy installation and service.

1-1

INTRODUCTION

CONTENTS

1.3 Indoor Unit

The indoor unit is wall mounted, and can be easily fitted to many types of residential
and commercials applications.
New design is available in LED version.

Indoor Unit features:

Feature LEX 25 DCI LEX 35 DCI LEX 50 DCI LEX 60 DCI LEX 72 DCI

Display LED

Ionizer Optional

ESF Optional

Fresh air Optional

Indoor fan motor Variable speed (PG)

Horizontal motorized louver YES

Vertical motorized louver Optional

Heating element NO

M2L Cable port YES

Dry contact Presence detector or (jumper selected) power shedding

1.4 Filtration

The LEX DCI INV series presents several types of air filters:

● Easily accessible, and re-usable pre-filters (mesh)

● Pre-charged electrostatic filter (disposable)

● Active carbon filter (disposable)

● ESF. Active Electro Static re-usable filter (optional)

1.5 Ionizer (Optional)

A special design Ionizer protected by unique patents integrated into the indoor unit,
generating negative ions to the room providing comfort and upgraded indoor air quality.

1.6 Control

The microprocessor indoor controller, and an infrared remote control, supplied as
standard, provides complete operating function and programming.
Remote controllers: RC-2/3/4/5/7, RC-4i-1, RCW, μBMS.
Networking system Airconet version 4.2 and up, MIU SW version H8 and up.
For further details please refer to the Operational Manual.

1-2

SM LEXDCI 1-E.1 GB

1.7 Outdoor Unit

CONTENTS

The LEX DCI INV outdoor units can be installed as floor or wall mounted units by using
a wall supporting bracket. The metal sheets are protected from corrosion paint work
allowing long life resistance. All outdoor units are pre-charged. For further information
please refer to the Product Data Sheet, Chapter 2.

Outdoor Unit Feature

Feature DCI 25 DCI 35 DCI 50 DCI 60 DCI 72Z

Display 3 LED’s

Base Heater Optional
Outdoor Fan Variable speed DC Inverter

1.8 Tubing Connections

Flare type interconnecting tubing to be produced on site.
For further details please refer to the Installation Manual.

INTRODUCTION

1.9 Accessories

Item Description

MIU (LEX) MODBUS interface unit

RS485 Adapter

Base Heater

M2L cable Port

1.10 Inbox Documentation

Each unit is supplied with its own installation and operation manuals.

To be used as an interface with RCW

or μBMS remote controllers

SM LEXDCI 1-E.1 GB

1-3

INTRODUCTION

CONTENTS

1.11 Matching Table

1.11.1 R410A

OUTDOOR UNITS

INDOOR UNITS

MODEL REFR”

DCI 25 R410A

DCI 35 R410A

DCI 50 R410A

DCI 60 R410A

DCI 72Z R410A

LEX 25 LEX 35 LEX 50 LEX 60 LEX 72

√

√

√

√

√

1-4

SM LEXDCI 1-E.1 GB

PRODUCT DATA SHEET

CONTENTS

2. PRODUCT DATA SHEET

2.1 LEX 25 DCI

Model Indoor Unit LEX 25 DCI
Model Outdoor Unit DCI 25 R410A

Installation Method of Pipe Flared

Characteristics Units Cooling Heating

Capacity
Power input

EER (Cooling) or COP(Heating)
Energy efficiency class A A

Power supply

Rated current A 2.7 3.8
Power factor 0.97 0.97
Prated (IDU) W 32
Prated (IDU+ODU) W 1600
Starting current A 10.5
Circuit breaker rating A 15

Operation control type Remote control
Heating elements (Option) kW
Others

(1)

(1)

(1)

Fan type & quantity Crossflow x 1
Fan speeds H/M/L RPM 1050/900/800

Air flow
External static pressure Min Pa 0

Sound power level
Sound pressure level

Moisture removal l/hr 1
Condenstate drain tube I.D mm 16

INDOOR

Dimensions WxHxD mm 810x285x210
Net Weight kg 11.5
Package dimensions WxHxD mm 870x356x282
Packaged weight kg 14
Units per pallet units 28
Stacking height units 7 levels
Refrigerant control Electronical Expansion Valve
Compressor type,model Single Rotary DC Inverter,Panasonic 5RS102XAB
Fan type & quantity Propeller x 1
Fan speeds H RPM 830
Air flow H m3/hr 1780
Sound power level H dB(A) 61

Sound pressure level
Dimensions WxHxD mm 795x610x290

Net Weight kg 38
Package dimensions WxHxD mm 970x650x394
Packaged weight kg 42
Units per pallet Units 9

OUTDOOR

Stacking height units 3 levels
Refrigerant type R410A
Standard charge kg(7.5m) 1.1
Additional charge No need

(2)

(3)

(4)

(4)

Connections between units

H/M/L m3/hr 530/430/330

H/M/L dB(A) 51/ - /39
H/M/L dB(A) 39/ - /26

H dB(A) 51

Liquid line In.(mm) 1/4"(6.35)
Suction line In.(mm) 3/8"(9.53)
Max.tubing length m. Max.20
Max.height
difference

Btu/hr 8530(4780-12280) 11600(5120-17060)

kW 2.5(1.4-3.6) 3.4(1.5-5.0)
kW 0.595(0.42-1.0) 0.81(0.39-1.6)

W/W 4.20 4.20

V 220-240
Ph 1
Hz 50

m. Max.10

(1) Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units) and EN 14511.
(2) Airflow in ducted units; at nominal external static pressure.
(3) Sound power in ducted units is measured at air discharge.
(4) Sound pressure level measured at 1 meter distance from unit.

SM LEXDCI 1-E.1 GB

2-1

PRODUCT DATA SHEET

CONTENTS

2.2 LEX 35 DCI

Model Indoor Unit LEX 35 DCI
Model Outdoor Unit DCI 35 R410A

Installation Method of Pipe Flared

Characteristics Units Cooling Heating

Capacity

Power input
EER (Cooling) or COP (Heating)

Energy efficiency class A A

Power supply

Rated current A 4.6 5.2
Power factor 0.97 0.97
Prated (IDU) W 40
Prated (IDU+ODU) W 1800
Starting current A 10.5
Circuit breaker rating A 15

Operation control type Remote control
Heating elements (Option) kW
Others

(1)

(1)

(1)

Fan type & quantity Crossflow x 1
Fan speeds H/M/L RPM 1100/950/800

Air flow
External static pressure Min Pa 0

Sound power level
Sound pressure level

Moisture removal l/hr 1.5
Condenstate drain tube I.D mm 16

INDOOR

Dimensions WxHxD mm 810x285x210
Net Weight kg 11.5
Package dimensions WxHxD mm 870x356x282
Packaged weight kg 14
Units per pallet units 28
Stacking height units 7 levels
Refrigerant control Electronical Expansion Valve

Compressor type,model Single Rotary DC Inverter,Panasonic 5RS102XAB
Fan type & quantity Propeller x 1

Fan speeds H RPM 830
Air flow H m3/hr 1780
Sound power level H dB(A) 62

Sound pressure level
Dimensions WxHxD mm 795x610x290

Net Weight kg 38.5
Package dimensions WxHxD mm 970x650x394
Packaged weight kg 42.5
Units per pallet Units 9

OUTDOOR

Stacking height units 3 levels
Refrigerant type R410A
Standard charge kg(7.5m) 1.2
Additional charge g/m No need

Connections between units

(2)

(3)

H/M/L m3/hr 550/450/350

(4)

(4)

Liquid line In.(mm) 1/4"(6.35)
Suction line In.(mm) 3/8"(9.53)
Max.tubing length m. Max.20
Max.height difference m. Max.10

H/M/L dB(A) 52/ - /39
H/M/L dB(A) 40/ - /26

H dB(A) 52

Btu/hr 11940(4780-14670) 14670(5100-19790)

kW 3.5(1.4-4.3) 4.3(1.5-5.8)
kW 0.99(0.42-1.25) 1.125(0.39-1.75)

W/W 3.54 3.82

V 220-240
Ph 1
Hz 50

(1) Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units) and EN 14511.
(2) Airflow in ducted units; at nominal external static pressure.
(3) Sound power in ducted units is measured at air discharge.
(4) Sound pressure level measured at 1 meter distance from unit.

2-2

SM LEXDCI 1-E.1 GB

PRODUCT DATA SHEET

CONTENTS

2.3 LEX 50 DCI

Model Indoor Unit LEX 50 DCI
Model Outdoor Unit DCI 50

Installation Method of Pipe Flared

Characteristics Units Cooling Heating

Capacity

Power input
EER (Cooling) or COP(Heating)

(1)

(1)

(1)

Energy efficiency class A A
Power supply V/Ph/Hz 220-240V/Single/50Hz
Rated current A 6.6 7.5
Starting current A 10.5
Circuit breaker rating A 20

Fan type & quantity Crossflow x 1
Fan speeds H/M/L RPM 1200/1050/900
Air flow

(2)

H/M/L m3/hr 850/760/620
External static pressure Min-Max Pa 0
Sound power level

(3)

Sound pressure level

(4)

H/M/L dB(A) 55/51/47

H/M/L dB(A) 43/39/34
Moisture removal l/hr 2
Condenstate drain tube I.D mm 16

INDOOR

Dimensions WxHxD mm 1060x295x210
Weight kg 15
Package dimensions WxHxD mm 1125x360x280
Packaged weight kg 18
Units per pallet units 16 units per pallet
Stacking height units 8 levels
Refrigerant control EEV
Compressor type,model Scroll,Panasonic 5CS130XCC03
Fan type & quantity Propeller(direct) x 1
Fan speeds H/L RPM 920
Air flow H/L m3/hr 2160
Sound power level H/L dB(A) 63
Sound pressure level

(4)

H/L dB(A) 53
Dimensions WxHxD mm 795x610x290
Weight kg 39
Package dimensions WxHxD mm 945x655x395
Packaged weight kg 43
Units per pallet Units 9 units per pallet

OUTDOOR

Stacking height units 3 levels
Refrigerant type R410A
Refrigerant chargless distance kg/m 1.50/7.5
Additional charge per 1 meter g/m No need

Liquid line In.(mm) 1/4”(6.35)

Connections between units

Suction line In.(mm) 1/2”(12.7)
Max.tubing length m. Max.30

Max.height difference m. Max. 10
Operation control type Remote control
Heating elements kW
Others

Btu/hr 17060(5120-20470) 20470(5120-25930)

kW 5.00(1.50-6.00) 6.00(1.50-7.60)
kW 1.46(0.50-2.00) 1.66(0.45-2.20)

W/W 3.42 3.61

(1) Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units) and EN 14511.
(2) Airflow in ducted units; at nominal external static pressure.
(3) Sound power in ducted units is measured at air discharge.
(4) Sound pressure level measured at 1 meter distance from unit.

SM LEXDCI 1-E.1 GB

2-3

PRODUCT DATA SHEET

CONTENTS

2.4 LEX 60 DCI

Model Indoor Unit LEX-60 DCI
Model Outdoor Unit DCI 60

Installation Method of Pipe Flared

Characteristics Units Cooling Heating

Capacity

Power input
EER (Cooling) or COP(Heating)

(1)

(1)

(1)

Energy efficiency class B B
Power supply V/Ph/Hz 220-240V/Single/50Hz
Rated current A 8.9 8.6
Starting current A 10.5
Circuit breaker rating A 20

Fan type & quantity Crossflow x 1
Fan speeds H/M/L RPM 1250/1100/1000
Air flow

(2)

H/M/L m3/hr 900/760/620
External static pressure Min-Max Pa 0
Sound power level

(3)

Sound pressure level

(4)

H/M/L dB(A) 56/53/48

H/M/L dB(A) 45/40/34
Moisture removal l/hr 2
Condenstate drain tube I.D mm 16

INDOOR

Dimensions WxHxD mm 1060x295x210
Weight kg 15
Package dimensions WxHxD mm 1125x360x280
Packaged weight kg 18
Units per pallet units 16 units per pallet
Stacking height units 8 levels
Refrigerant control EEV
Compressor type,model Scroll,Panasonic 5CS130XCC03
Fan type & quantity Propeller(direct) x 1
Fan speeds H/L RPM 820
Air flow H/L m3/hr 2860
Sound power level H/L dB(A) 65
Sound pressure level

(4)

H/L dB(A) 55
Dimensions WxHxD mm 846x690x302
Weight kg 46
Package dimensions WxHxD mm 990x770x430
Packaged weight kg 50
Units per pallet Units 9 units per pallet

OUTDOOR

Stacking height units 3 levels
Refrigerant type R410A
Refrigerant chargless distance kg/m 1.65/7.5
Additional charge per 1 meter g/m No need

Liquid line In.(mm) 1/4”(6.35)
Suction line In.(mm) 1/2”(12.7)

Connections between units

Max.tubing length m. Max.30
Max.height

difference

Operation control type Remote control
Heating elements kW
Others

Btu/hr 20470(5120-22860) 22180(5120-26950)

kW 6.00(1.50-6.70) 6.50(1.80-7.90)
kW 1.99(0.50-2.20) 1.90(0.45-2.30)

W/W 3.02 3.42

m. Max. 10

(1) Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units) and EN 14511.
(2) Airflow in ducted units; at nominal external static pressure.
(3) Sound power in ducted units is measured at air discharge.
(4) Sound pressure level measured at 1 meter distance from unit.

2-4

SM LEXDCI 1-E.1 GB

PRODUCT DATA SHEET

CONTENTS

2.5 LEX 72 DCI

Model Indoor Unit LEX 72 DCI
Model Outdoor Unit GC-DCI 72 Z

Installation Method of Pipe Flared

Characteristics Units Cooling Heating

Capacity

Power input
EER (Cooling) or COP(Heating)

(1)

(1)

(1)

Energy efficiency class B C
Power supply V/Ph/Hz 220-240V/Single/50Hz
Rated current A 9.8 10.3
Starting current A 15
Circuit breaker rating A 20

Fan type & quantity Crossflow x 1
Fan speeds H/M/L RPM 1300/1150/1000 1350/1200/1050
Air flow

(2)

H/M/L m3/hr 950/800/650 1000/850/700
External static pressure Min-Max Pa 0
Sound power level
Sound pressure level

(3)

(4 )

H/M/L dB(A) 60/54/47

H/M/L dB(A) 47/41/34
Moisture removal l/hr 2.5
Condenstate drain tube I.D mm 16

INDOOR

Dimensions WxHxD mm 1060x295x210
Weight kg 15
Package dimensions WxHxD mm 1115x350x260
Packaged weight kg 18
Units per pallet units 16
Stacking height units 8 levels
Refrigerant control EEV
Compressor type,model Two Rotary,Mitsubishi TNB220F
Fan type & quantity Propeller(direct) x 1
Fan speeds H/L RPM 850
Air flow H/L m3/hr 3600
Sound power level H/L dB(A) 66
Sound pressure level

(4)

H/L dB(A) 56
Dimensions WxHxD mm 950x835x412
Weight kg 65.5
Package dimensions WxHxD mm 1080x910x477
Packaged weight kg 73
Units per pallet Units 2

OUTDOOR

Stacking height units 2 levels
Refrigerant type R410A
Refrigerant chargless distance kg/m 2.4kg/30m
Additional charge per 1 meter g/m No Need

Liquid line In.(mm) 3/8"(9.53)
Suction line In.(mm) 5/8"(15.88)

Connections between units

Max.tubing length m. Max.30
Max.height difference m. Max.15

Operation control type Remote control
Heating elements (Option) kW
Others

(1) Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units) and EN 14511.
(2) Airflow in ducted units; at nominal external static pressure.
(3) Sound power in ducted units is measured at air discharge.
(4) Sound pressure level measured at 1 meter distance from unit.

Btu/hr 23188(5100~25575) 25916(5100~30000)

kW 6.8(1.5-7.5) 7.6(1.5~8.8)
kW 2.25(0.5-2.8) 2.35(0.45~3.0)

W/W 3.01 3.23

SM LEXDCI 1-E.1 GB

2-5

3. RATING CONDITIONS

CONTENTS

Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units).

Cooling:

Indoor: 27oC DB 19oC WB
Outdoor: 35 oC DB

Heating:

Indoor: 20oC DB
Outdoor: 7oC DB 6oC WB

3.1 Operating Limits

3.1.1 R410A

RATING CONDITIONS

Indoor Outdoor

Cooling

Heating

Upper limit

Lower limit

Upper limit

Lower limit

Voltage

32oC DB 23oC WB 46oC DB

21oC DB 15oC WB -10oC DB

27oC DB 24oC DB 18oC WB

10oC DB -15oC DB -16oC WB

198 – 264 V

SM LEXDCI 1-E.1 GB

3-1

4. OUTLINE DIMENSIONS

CONTENTS

4.1 Indoor Unit: LEX 25 / 35 DCI

OUTLINE DIMENSIONS

AIR INTAKE

AIR INTAKE

210

285

MOUNTING TEMPLATE
TO BE USED FOR LOCATION
OF INDOOR UNIT ON THE WALL

18.5

30.0

285.0

42.0

93.0

MOUTING PLATE OUTLINE

8.0

70.0

167.5

83.0

100.5

TUBING WALL OPENING
(FOR REAR LEFT ROUTING)

CEELING

810.0

167.5

TUBING WALL OPENING

(FOR REAR ROUTING)

811

INDOOR UNIT OUTLINE

100.0 MIN

8.0

83.0

100.5

70.0

42.0

93.0

AIR OUTLET

4.2

Outdoor Unit: DCI 25 / 35 / 50

SM LEXDCI 1-E.1 GB

4-1

OUTLINE DIMENSIONS

CONTENTS

4.3 Indoor Unit: LEX 50 / 60 / 72

295

1060

4.4 Outdoor Unit: DCI 60

221

4-2

SM LEXDCI 1-E.1 GB

4.5 Outdoor Unit: DCI 72 Z

CONTENTS

OUTLINE DIMENSIONS

SM LEXDCI 1-E.1 GB

4-3

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5. PERFORMANCE DATA

5.1 LEX 25 / DCI 25

5.1.1 Cooling Capacity (kW) - Run Mode

ID COIL ENTERING AIR DB/WB TEMPERATURE [ºC]

OD COIL

ENTERING AIR DB

TEMPERATURE

[C

0

]

-10 - 20

(protection range)

25

30

35

40

46

DATA 22/15 24/17 27/19 29/21 32/23

TC
SC

PI
TC 2.42 2.57 2.73 2.89 3.05
SC 1.64 1.67 1.71 1.74 1.77

PI 0.47 0.48 0.49 0.49 0.50
TC 2.30 2.46 2.62 2.77 2.93
SC 1.60 1.63 1.67 1.70 1.73

PI 0.52 0.53 0.54 0.55 0.56

TC 2.18 2.34
SC 1.56 1.59

PI 0.58 0.59

TC 2.07 2.23 2.38 2.54 2.70
SC 1.52 1.55 1.58 1.62 1.65

PI 0.63 0.64 0.65 0.66 0.67
TC 1.93 2.09 2.24 2.40 2.56

SC 1.47 1.50 1.53 1.57 1.60

PI 0.70 0.71 0.72 0.72 0.73

80 - 110 % of nominal
80 - 105 % of nominal

25 - 50 % of nominal

2.50

1.63

0.60

2.66 2.82

1.66 1.69

0.60 0.61

LEGEND

TC – Total Cooling Capacity, kW
SC – Sensible Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (
DB – Dry Bulb Temp., (

o

C)

o

C)
ID – Indoor
OU - Outdoor

5.1.2 Capacity Correction Factors

1.2

1.1

1

0.9

0.8

0.7

Capacity Ratio

0.6

0.5

20 25 30 35 40 45

Outdoor Tempera ture [deg C]

SM LEXDCI 1-E.1 GB

5-1

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.1.3 Heating Capacity (kW) - Run Mode)

ID COIL ENTERING AIR DB TEMPERATURE [ºC]

OD COIL

ENTERING AIR

DB/WB

TEMPERATURE

[ºC]

-15/-16

-10/-12

-7/-8

-1/-2

2/1

7/6

10/9

15/12

15-24

(Protection Range)

DATA 15 20 25

TC 2.16 2.01 1.86

PI 0.49 0.54 0.58

TC 2.41 2.26 2.11

PI 0.59 0.64 0.68

TC 2.59 2.44 2.29

PI 0.66 0.71 0.76

TC 2.68 2.53 2.38

PI 0.70 0.75 0.80

TC 2.75 2.59 2.44

PI 0.72 0.77 0.82

TC 3.55

PI 0.76

TC 3.75 3.60 3.44

PI 0.81 0.86 0.90

TC 3.94 3.79 3.64

PI 0.85 0.90 0.95

TC 85 - 105 % of nominal

PI 80 - 120 % of nominal

3.40

0.81

3.25

0.86

LEGEND

TC

TH – Total Heating Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (
DB – Dry Bulb Temp., (

o

C)

o

C)
ID – Indoor
OU - Outdoor

5.1.4 Capacity Correction Factors

1.2

1.1

1

0.9

0.8

0.7

Capaci ty Ratio

0.6

0.5

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [deg C]

5-2

SM LEXDCI 1-E.1 GB

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.2 Capacity Correction Factor Due to Tubing Length

5.2.1 Cooling

1.01

1.00

0.99

0.98

0.97

0.96

0.95

0.94

Capacity Ratio

0.93

0.92

0.91

3 4 5 6 7 8 9 1011121314151617181920

Tubing Length [m]

5.2.2 Heating

1.02

1.00

0.98

0.96

0.94

Capacity Ratio

0.92

0.90

3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Tubing Length [m]

SM LEXDCI 1-E.1 GB

5-3

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.3 LEX 35 / DCI 35

5.3.1 Cooling Capacity (kW) - Run Mode

ID COIL ENTERING AIR DB/WB TEMPERATURE [ºC]

OD COIL

ENTERING AIR DB

TEMPERATURE

[ºC]

-10 - 20

(protection range)

25

30

35

40

46

DATA 22/15 24/17 27/19 29/21 32/23

TC
SC

PI
TC 3.38 3.60 3.83 4.05 4.27
SC 2.40 2.45 2.50 2.55 2.60

PI 0.78 0.79 0.81 0.82 0.84
TC 3.22 3.44 3.66 3.88 4.11
SC 2.34 2.39 2.44 2.49 2.54

PI 0.87 0.88 0.90 0.91 0.93

TC 3.06 3.28
SC 2.28 2.33

PI 0.96 0.98

TC 2.89 3.12 3.34 3.56 3.78
SC 2.22 2.27 2.32 2.37 2.42

PI 1.05 1.07 1.08 1.10 1.11
TC 2.70 2.92 3.14 3.36 3.58

SC 2.15 2.20 2.25 2.30 2.34

PI 1.16 1.18 1.19 1.21 1.22

80 - 110 % of nominal
80 - 105 % of nominal

25 - 50 % of nominal

3.50

2.38

0.99

3.72 3.94

2.43 2.48

1.00 1.02

LEGEND

TC – Total Cooling Capacity, kW
SC – Sensible Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (
DB – Dry Bulb Temp., (

o

o

C)

C)

ID – Indoor
OU - Outdoor

5.3.2 Capacity Correction Factors

1.2

1.1

1

0.9

0.8

0.7

Capacity Ratio

0.6

0.5
20 25 30 35 40 45

Outdoor Temperature [deg C]

5-4

SM LEXDCI 1-E.1 GB

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.3.3 Heating Capacity (kW) - Run Mode

ID COIL ENTERING AIR DB TEMPERATURE [ºC]

OD COIL

ENTERING AIR

DB/WB

TEMPERATURE

[ºC]

-15/-16

-10/-12

-7/-8

-1/-2

2/1

7/6

10/9

15/12

15-24

(Protection Range)

DATA 15 20 25

TC 2.74 2.55 2.35

PI 0.68 0.74 0.81

TC 3.05 2.86 2.66

PI 0.81 0.88 0.95

TC 3.28 3.09 2.90

PI 0.92 0.99 1.06

TC 3.39 3.20 3.01

PI 0.97 1.04 1.11

TC 3.47 3.28 3.09

PI 1.00 1.07 1.14

TC 4.49

PI 1.06

TC 4.74 4.55 4.36

PI 1.12 1.19 1.26

TC 4.99 4.80 4.60

PI 1.18 1.25 1.32

TC 85 - 105 % of nominal

PI 80 - 120 % of nominal

4.30

1.13

4.11

1.19

LEGEND

TC

TH – Total Heating Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (
DB – Dry Bulb Temp., (

o

o

C)

C)

ID – Indoor
OU - Outdoor

5.3.4 Capacity Correction Factors

1.2

1.1

1

0.9

0.8

0.7

Capacity Ratio

0.6

0.5

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [deg C]

SM LEXDCI 1-E.1 GB

5-5

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.4 Capacity Correction Factor Due to TUbing Length

5.4.1 Cooling

1.01

1.00

0.99

0.98

0.97

0.96

0.95

0.94

Capaci ty Ratio

0.93

0.92

0.91

3 4 5 6 7 8 9 1011121314151617181920

Tubing Length [m]

5.4.2 Heating

1.02

1.00

0.98

0.96

0.94

Capacity Ratio

0.92

0.90

3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Tubing Length [m]

5-6

SM LEXDCI 1-E.1 GB

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.5 LEX 50 / DCI 50

5.5.1 Cooling Capacity (kW) - Run Mode

230[V] : Indoor Fan at High Speed.

OD COIL

ENTERING AIR DB

TEMPERATURE [

0

DATA

C]

ID COIL ENTERING AIR DB/WB TEMPERATURE [0C]

22/15 24/17 27/19 29/21 32/23

-10 - 20

(protection range)

TC 80 - 110 % of nominal
SC 80 - 105 % of nominal

PI 25 - 50 % of nominal

TC 4.93 5.22 5.51 5.80 6.09

25

SC 4.10 4.16 4.22 4.28 4.34

PI 1.10 1.13 1.15 1.18 1.20

TC 4.67 4.96 5.25 5.54 5.83

30

SC 3.94 4.00 4.06 4.12 4.18

PI 1.26 1.28

TC 4.42 4.71

35

SC 3.78 3.84 3.90 3.96 4.02

PI 1.41 1.44

TC 4.17 4.46

40

SC 3.62 3.68 3.74 3.80 3.86

PI 1.56 1.59 1.61 1.64 1.66

TC 3.86 4.15 4.44 4.73 5.02

46

SC 3.43 3.49 3.55 3.61 3.67

PI 1.75 1.77 1.80 1.82 1.85

LEGEND

TC – Total Cooling Capacity, kW
SC – Sensible Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (oC)
DB – Dry Bulb Temp., (oC)
ID – Indoor
OD – Outdoor

1.31

5.00

1.46

4.75

1.33 1.36

5.29 5.58

1.48 1.51

5.04 5.53

5.5.2 Capacity Correction Factors

SM LEXDCI 1-E.1 GB

Cool ing Ca pacity Ra ti o V s. Outdoor Te m pe ra tu re

1.20

1.10

1.00

0.90

0.80

0.70

Capaci ty Ration

0.60

0.50
20 25 30 35 40 45

Outdoor DB Temperature [ºC]

5-7

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.5.3 Heating Capacity (kW) - Run Mode)

230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB TEMPERATURE [0C]

OD COIL ENTERING

AIR DB/WB

TEMPERATURE [

DATA 15 20 25

0

C]

-15/-16

-10/-12

-7/-8

-1/-2

2/1

7/6

10/9

15/12

15-24

(Protection Range)

TC 2.73 2.34 1.94

PI 1.16 1.24 1.33

TC 3.60 3.21 2.82

PI 1.31 1.40 1.48

TC 4.26 3.87 3.47

PI 1.43 1.51 1.59

TC 4.59 4.19 3.80

PI 1.48 1.57 1.65

TC 4.81 4.41 4.02

PI 1.52

TC 6.39

PI 1.58

TC 6.72

PI 1.61 1.69 1.77

TC 7.06 6.66 6.27

PI 1.64 1.72 1.80

TC 85 - 105 % of nominal

PI 80 - 120 % of nominal

LEGEND

TC – Total Heating Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (oC)
DB – Dry Bulb Temp., (oC)
ID – Indoor
OD – Outdoor

1.60

6.00

1.66

6.33

1.69

5.61

1.74

5.94

5.5.4 Capacity Correction Factors

5-8

1.20

1.10

1.00

0.90

0.80

0.70

0.60

Capaci ty Rati on

0.50

0.40

Hea ting Ca pa ci ty Ratio Vs. Outdoor Tem pe ra ture

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [ºC]

SM LEXDCI 1-E.1 GB

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.6 LEX 60 / DCI 60

5.6.1 Cooling Capacity (kW) - Run Mode

230[V] : Indoor Fan at High Speed.

OD COIL

ENTERING AIR DB

TEMPERATURE [

-10 - 20

(protection range)

25

30

35

40

(Protection Range)

46

(Protection Range)

ID COIL ENTERING AIR DB/WB TEMPERATURE [

0

DATA

C]

22/15 24/17 27/19 29/21 32/23

0

C]

TC 80 - 110 % of nominal
SC 80 - 105 % of nominal

PI 25 - 50 % of nominal
TC 5.91 6.26 6.61 6.95 7.30
SC 4.64 4.71 4.78 4.85 4.92

PI 1.50 1.54 1.57 1.61 1.64
TC 5.61 5.96 6.30 6.65 7.00
SC 4.46 4.53 4.60 4.67 4.74

PI 1.71 1.75
TC 5.30 5.65

1.78

6.00

1.81 1.85

6.35 6.70

SC 4.28 4.35 4.42 4.49 4.56

PI 1.92 1.96
TC 5.00 5.35

1.99

5.70

2.02 2.06

6.05 6.39

SC 4.10 4.17 4.24 4.31 4.38

PI 2.13 2.17 2.20 2.23 2.27
TC 4.64 4.99 5.33 5.68 6.03
SC 3.88 3.95 4.02 4.09 4.16

PI 2.38 2.42 2.45 2.48 2.52

LEGEND

TC – Total Cooling Capacity, kW
SC – Sensible Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (oC)
DB – Dry Bulb Temp., (oC)
ID – Indoor
OD – Outdoor

5.6.2 Capacity Correction Factors

Cool ing Ca pa ci ty Ra tio Vs. Ou tdoo r Te m pe ra tur e

1.20

1.10

1.00

0.90

0.80

0.70

Capaci ty Ratio n

0.60

0.50

20 25 30 35 40 45

Outdoor DB Temperature [ºC]

SM LEXDCI 1-E.1 GB

5-9

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.6.3 Heating Capacity (kW) - Run Mode

230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB TEMPERATURE [0C]

OD COIL ENTERING

AIR DB/WB

TEMPERATURE [

DATA

0

C]

15 20 25

-15/-16

-10/-12

-7/-8

-1/-2

2/1

7/6

10/9

15/12

15-24

(Protection Range)

TC 2.96 2.53 2.11

PI 1.33 1.42 1.52

TC 3.90 3.48 3.05

PI 1.50 1.60 1.69

TC 4.61 4.19 3.76

PI 1.63 1.73 1.82

TC 4.97 4.54 4.12

PI 1.70 1.79 1.82

TC 5.21 4.78 4.35

PI 1.74

TC 6.93

PI 1.81

TC 7.28

PI 1.84 1.93 2.03

TC 7.64 7.22 6.79

PI 1.87 1.97 2.06

TC 85 - 105 % of nominal

PI 80 - 120 % of nominal

LEGEND

TC – Total Heating Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (oC)
DB – Dry Bulb Temp., (oC)
ID – Indoor
OD – Outdoor

1.84

6.50

1.90

6.86

1.93

6.07

2.00

6.43

5.6.4 Capacity Correction Factors

5-10

1.20

1.10

1.00

0.90

0.80

0.70

0.60

Capacity Ration

0.50

0.40

Heating Capa city Ratio Vs. Outdoor Tempera ture

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [ºC]

SM LEXDCI 1-E.1 GB

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.7 LEX 72 / DCI 72Z

5.7.1 Cooling Capacity (kW) - Run Mode

230[V] : Indoor Fan at High Speed.

OD COIL

ENTERING AIR DB

TEMPERATURE [

-10 - 20

(protection range)

25

30

35

40

(Protection Range)

46

(Protection Range)

ID COIL ENTERING AIR DB/WB TEMPERATURE [

0

C]

TC

DATA

22/15 24/17 27/19 29/21 32/23

80 - 110 % of nominal

0

C]

SC 80 - 105 % of nominal

PI 25 - 50 % of nominal

TC 6.70 7.09 7.49 7.88 8.28

SC 5.04 5.12 5.19 5.27 5.34

PI 1.70 1.74 1.78 1.82 1.85

TC 6.35 6.75 7.14 7.54 7.93

SC 4.85 4.92 5.00 5.07 5.15

PI 1.94 1.98 2.01 2.05 2.09

TC 6.01 6.41 6.80 7.19 7.59

SC 4.65 4.73 4.80 4.87 4.95

PI 2.17 2.21 2.25 2.29 2.33

TC 5.67 6.06 6.46 6.85 7.25

SC 4.45 4.53 4.60 4.68 4.75

PI 2.41 2.45 2.49 2.52 2.56

TC 5.26 5.65 6.04 6.44 6.83

SC 4.22 4.29 4.37 4.44 4.52

PI

2.69 2.73 2.77 2.81 2.85

LEGEND

TC – Total Cooling Capacity, kW
SC – Sensible Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (oC)
DB – Dry Bulb Temp., (oC)
ID – Indoor

OD – Outdoor

5.7.2 Capacity Correction Factors

Cool ing Ca pacity Ra ti o Vs. Outdoor Te m pe rature

1.20

1.10

1.00

0.90

0.80

0.70

Capaci ty Ration

0.60

0.50

20 25 30 35 40 45

Outdoor DB Temperature [ºC]

SM LEXDCI 1-E.1 GB

5-11

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.7.3 Heating Capacity (kW) - Run Mode

230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB TEMPERATURE [0C]

OD COIL ENTERING

AIR DB/WB

TEMPERATURE [

-15/-16

-10/-12

-7/-8

-1/-2

2/1

7/6

10/9

15/12

15-24

(Protection Range)

0

C]

TC

PI 1.53 1.64 1.75

TC 4.23 3.77 3.31

PI 1.73 1.84 1.95

TC 5.00 4.54 4.08

PI 1.88 1.99 2.10

TC 5.39 4.93 4.47

PI 1.96 2.07 2.17

TC 5.65 5.18 4.72

PI 2.01 2.12 2.22

TC 7.51 7.05 6.59

PI 2.08 2.19 2.30

TC 7.90 7.44 6.98

PI 2.12 2.23 2.34

TC 8.28 7.83 7.37

PI 2.16 2.27 2.38

TC 85 - 105 % of nominal

PI

DATA

15 20 25

3.21 2.75 2.28

80 - 120 % of nominal

LEGEND

TC – Total Heating Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (oC)

o

DB – Dry Bulb Temp., (

C)
ID – Indoor
OD – Outdoor

5.7.4 Capacity Correction Factors

1.20

1.10

1.00

0.90

0.80

0.70

0.60

Capacity Ration

0.50

0.40

Heating Capa city Ratio Vs. Outdoor Tempera ture

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [ºC]

5-12

SM LEXDCI 1-E.1 GB

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.8 Capacity Correction Factor Due to Tubing Length

5.8.1 LEX 50 / 60 / 72 DCI: Cooling

1.02

1.00

0.98

0.96

0.94

0.92

0.90

Capacity ratio

0.88

0.86
4 6 8 101214161820 2224262830

Tubing length(m)

5.8.2 Heating

1.02

1.00

0.98

0.96

0.94

0.92

0.90

0.88

Capaci ty ratio

0.86

0.84

4 6 8 101214161820 222426 2830

Tubing Length(m)

SM LEXDCI 1-E.1 GB

5-13

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.9 Pressure Curves

5.9.1. Model: LEX 50 / DCI 50 Cooling — Test Mode

Suction Pressure VS.Outdoor Temp.

1100

1000

900

800

700

600

Suction Pressure [kPa]

500

10 15 20 25 30 35 40 45

Outdoor DB Temperature[ºC ]

Discharge Pressure VS. Outdoor Temp.

4000

3500

3000

2500

2000

1500

Discharge Pressure [kPa]

1000

10 15 20 25 30 35 40 45

Indoor

DB/WB T em p'

22/15

24/17

27/19

29/21

32/23

Indoor

DB/WB T e m p'

22/15

24/17

27/19

29/21

32/23

5-14

Outdoor DB Temperature[ºC ]

SM LEXDCI 1-E.1 GB

5.9.2. Heating — Test Mode

CONTENTS

Suction Pressure VS.Outdoor Temp.

1100

1000

900

800

700

600

500

400

Suction Pressure [kPa]

300

200

-15 -10 -5 0 5 10 15

Outdoor WB Temperature[ºC ]

PERFORMANCE DATA & PRESSURE CURVES

Indoor DB

15

20

25

Discharge Pressure VS. Outdoor Temp.

4000

3500

3000

2500

2000

1500

Discharge Pressure [kPa]

1000

-15 -10 -5 0 5 10 15

Outdoor WB Temperature

Indoor DB

15

20

25

SM LEXDCI 1-E.1 GB

5-15

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.9.3 Model: LEX 60 / DCI 60 Cooling — Test Mode.

Suction Pressure VS.Outdoor Temp.

1100

1000

900

800

700

600

Suction Pressure [kPa]

500

10 15 20 25 30 35 40 45

Outdoor DB Temperature[ºC ]

Indoor

DB/WB T e m p '

22/15
24/17

27/19
29/21

32/23

Discharge Pressure VS. Outdoor Temp.

4000

3500

3000

2500

2000

1500

Discharge Pressure [kPa]

1000

10 15 20 25 30 35 40 45

Outdoor DB Temperature

Indoor

DB/WB T e m p '

22/15
24/17

27/19
29/21

32/23

5-16

SM LEXDCI 1-E.1 GB

5.9.4 Heating — Test Mode

CONTENTS

Suction Pressure VS.Outdoor Temp.

1100

1000

900

800

700

600

500

400

Suction Pressure [kPa]

300

200

-15 -10 -5 0 5 10 15

Outdoor WB Temperature[ºC ]

PERFORMANCE DATA & PRESSURE CURVES

Indoor DB

15
20
25

Discharge Pressure VS. Outdoor Temp.

4000

3500

3000

2500

2000

1500

Discharge Pressure [kPa]

1000

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [ºC ]

Indoor DB

15

20
25

SM LEXDCI 1-E.1 GB

5-17

PERFORMANCE DATA & PRESSURE CURVES

CONTENTS

5.9.5 Model: LEX 72 / DCI 72 Z Cooling — Test Mode.

Suction Pressure vs. Outdoor Temperature

1000

900

800

700

Suction Pressure [kPa]

600

10 15 20 25 30 35 40 45

Discharge Pressure vs. Outdoor Temperature

3750
3500
3250
3000
2750
2500
2250
2000
1750

Discharge Pressure [kPa]

1500

10 15 20 25 30 35 40 45

Indoor

22/15
24/17
27/19
29/21
32/23

Outdoor DB Temperature

Indoor

22/15
24/17
27/19
29/21
32/23

Outdoor DB Temperature

5-18

SM LEXDCI 1-E.1 GB

5.9.6 Heating — Test Mode

CONTENTS

Suction Pressure vs. Outdoor Temperature

1200
1100
1000

900
800
700
600
500
400

Suction Pressure [kPa]

300

-15 -10 -5 0 5 10 15

PERFORMANCE DATA & PRESSURE CURVES

Indoor DB

15
20
25

Outdoor WB Temperature

4000
3750
3500
3250
3000
2750
2500
2250
2000
1750

Discharge Pressure [kPa]

1500

Discharge Pressure vs. Outdoor Temperature

Indoor DB

15
20
25

-15 -10 -5 0 5 10 15

Outdoor WB Temperature

SM LEXDCI 1-E.1 GB

5-19

SOUND LEVEL CHARACTERISTICS

CONTENTS

6. SOUND LEVEL CHARACTERISTICS

6.1 Sound Pressure Level

Unit

0.8m

Mic.

Figure 1

6.2 Sound Pressure Level Spectrum

LEX 25 LEX 35

-70NC

-60NC

-50NC

-40NC

Wall

FAN SPEED LINE

HI

ME

LO

(Measured as Figure 1)

-70NC

-60NC

-50NC

-40NC

MICRO AR0. 02 dB re , OCT VE BAN S UN PRES URE L VEL

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

-30NC

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

Hz, AND CE TER FREQUENC ES

Hz, AND CE TER FREQUENC ES

-20NC

MICRO AR0. 02 dB re , OCT VE BAN S UN PRES URE L VEL

LEX 50 LEX 60

NC-70

NC-60

NC-50

NC-40

NC-30

APPROXIMATE
THRESHOLD OF

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

HEARING FOR
CONTINUOUS
NOISE

-30NC

-20NC

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

SM LEXDCI 1-E.1 GB

BAND CENTER FREQUENCIES, Hz

BAND CENTER FREQUENCIES, Hz

6-1

SOUND LEVEL CHARACTERISTICS

CONTENTS

LEX 72 WNG 80

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

BAND CENTER FREQUENCIES, Hz

6-2

SM LEXDCI 1-E.1 GB

6.3 Outdoor units

CONTENTS

SOUND LEVEL CHARACTERISTICS

Unit

Mic.

Ground

Figure 2

6.4 Sound Pressure Level Spectrum

DCI 25 Cooling DCI 25 Heating

(Measured as Figure 2)

DCI 35 Cooling DCI 35 Heating

SM LEXDCI 1-E.1 GB

6-3

SOUND LEVEL CHARACTERISTICS

CONTENTS

DCI 50 Cooling DCI 50 Heating

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-70

NC-60

NC-50

NC-40

NC-30

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

BAND CENTER FREQUENCIES, Hz

BAND CENTER FREQUENCIES, Hz

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

DCI 60 Cooling DCI 60 Heating

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

BAND CENTER FREQUENCIES, Hz

6-4

SM LEXDCI 1-E.1 GB

SOUND LEVEL CHARACTERISTICS

CONTENTS

Sound Pressure Level Spectrum (Measured as Figure 2)

DCI 72 Z Cooling DCI 72 Z Heating

SM LEXDCI 1-E.1 GB

6-5

ELECTRICAL DATA

CONTENTS

7. ELECTRICAL DATA

7.1 Single Phase Unit

Model LEX 25 DCI LEX 35 DCI LEX 50 DCI LEX 60 DCI LEX 72 DCI

Power Supply 1 PH ,220-240VAC ,50HZ

Connected to To indoor To outdoor

Maximum Current 10A 13.5A 15A 15.7A

Inrush Current \

Starting Current\

Circuit Breaker 16A 20 A

Power Supply 3 X 1.5 mm² 3 X 2.5 mm²

Interconnecting cable 4 X 1.5 mm² 4 X 2.5 mm²

NOTE

(a)

(b)

(a) Inrush current is the current when power is up (charging the DC capacitors

at outdoor unit controller).

(b) Starting current is the current at compressor start up.

Power wiring cord should comply with local lows and electrical
regulations requirements.

35A 45 A <35A

10A 13.5 A 15A 15.7A

SM LEXDCI 1-E.1 GB

7-1

8. WIRING DIAGRAMS

CONTENTS

8.1 Indoor & Outdoor Units: LEX 25, 35 / DCI 25, 35

P9

Display

Dry contact

PH-12

Power supply

~230V 50Hz

4527310

(clock)

Flash port

2

P1

1

To metal sheet

P30

WIRING DIAGRAMS

45

3

M1

step motor

t

e

o

r

u

w

F

ESF

e

in

r

w

F

S

e

Ionzer

213

it

e

Voltage

regulator

ICTRAT

d

6

h

it

e

c

k

la

45

e

lu

31

IFAN

INDOOR UNIT CIRCUIT DIAGRAM

OUTDOOR UNIT CIRCUIT DIAGRAM

2

r

a

y

b

r

n

o

w

capacitor

r

a

y

SUCT

CTT

OCT

OAT

G

F

s

V

p

c

V

c

H

T

R

A

OFAN

E

d

c

V

heater

Base

valve

Reverse

e

it

e

Choke coil

c

k

w

n

COMP

d

P6

2

1

2

p

o
S

E

P12

1

2

p

o

E

(red)

1

P8

b

lu

P2

h

w

P10

212

P5

(red)

1

P4

re

w

b

b

g

1uF 400V

P16 P15P1 1 P3P19P14

g

22

1

1

2

1

2

1

e

lu

B

w

e

llo

Y

5 6

r

O

a

n

g

e

c

k

la

B

3 4

e

d

R

1 2

2

1

2

1

lu

B

W

h

la

B

W

V

r

B

o

e

R

U

P13

P20

P22

Indoor unit controller PCB

P8

P20

P19

P2

P21P22

P18

P17

P16

P1

P4

P14

Outdoor unit controller PCB

P13

P11

P9

P3

magnetic ring

Jumper

P17

31

2 4

megatool

P7

42
3

megatool

1

P6

1

2

3

P7

4
5

6

5

4

JP9

31

26

P12

EARTH

Y/G

N-COM

P10

COM

N
L

Y/G

L

N

4/L

5/C

6

EEV

magnetic ring

EMI filter PCB

Y/G

Red

Y/G

Red

Y/G

C/5

Y/G

Red

FUSE

COM

EARTH

COM

NCOM

EARTH

Black

Red

Blue

Brown

Blue

Brown

Blue

Brown

N/3

L/4

Brown

N

L

L-F

N-F

Blue

SM LEXDCI 1-E.1 GB

8-1

WIRING DIAGRAMS

CONTENTS

8.2 Indoor Unit: LEX 50 / LEX 60 DCI

13

capacitor

gray

2uF 450V

P9

PH-12

Di spl ay

ESF

P12

power out

ESF

2

Hori zont al step motor

213

P6(White)

IFAN

2

brown

gray

RAT

ICT

Fr e s h Air

Ionizer

P5(white)

M

power out

Ionizer

P8

211

(Re d)

P2

6

5

4

white

red

black

blue

2 1 21

P14P19P11P15P16

P3

(red)

P4

M1

Vertical step motor

54

M2

312

P10( Red)

45

1 2

P1

(clock)

Dry contact

Indoor unit controller PCB

Y/G

Red

Brown

Bl ue

P22 P20

6

5/C

4/L

P13

L

megatool

1

P7

magnet ic ring

3

Jumper

42

P24

910

871

To met al sheet

Note: The dashed part is optional

Y/G

Brown

Blu e

Power supply

~230V 50Hz

8.3 Outdoor Unit: DCI 50 / DCI 60

COMP

Red

U

Choke coil

White

Brown

Black

W

V

P13P9P3P11

Blue

P14

Reverse

valve

2

1

P4

Base
heater

1

P1

2

Outdoor unit controller PCB

JP9

FUSE

Jumper

2

13

EARTH

COM

L

N

P10

COML

N-COM

N

P12

EARTH

Y/G

Y/G

EMI f ilter PCB

Black

Red

Blue

Brown

EARTH

NCOM

COM

N-F

L-F

OFAN

cc

Vdc

1 2

Red

1 2

P6

4

5

Vsp

V

EARTH

FG

3 4

5 6

Blue

2

1

Yellow

Black

Orange

3 4

5 6

6

P2

P7

6

3

5

4

CTTOAT OCT

2

22

111

Flash

2

1

JP1

1

P8P20P19

42

3

EEV

Y/G

Red

Brown

Blue

C/5

L/4

N/3

Y/G

Red

Brown

Blue

8-2

SM LEXDCI 1-E.1 GB

8.4 Indoor & Outdoor Units: LEX 72 DCI / DCI 72

CONTENTS

INDOOR UNIT

WIRING DIAGRAMS

SM LEXDCI 1-E.1 GB

OUTDOOR UNIT

8-3

WIRING DIAGRAMS

CONTENTS

8.5 Outdoor Unit: DCI 72 Z

RED

U

3P

L

N

PMOC

BLK

BRN

V

W

9P

11P

01P

MOC

CORE

FERRITE

WHITE

31P

MOC-N

KCALB

DER

EULB

NWORB

EKOHC

LIOC

BLUE

41P

G/Y

ESREVER

EVLAV

ESAB

RETAEH

)LANOITPO(

NAFO

TTCTCO

TSHTAOTMO

143562

2

1

4P

21

1P

1

112

6P

ABCPRELLORTNOCUDO

21P

9PJ

321HTRAE

654

65

2
02P

91P

7P

342

12

2211

2P

5P

8P

1

VEE

SNIAMCA

ABCPRETLIFIME

HTRAE

MOCN

MOC

F-N

F-L

HTRAE

MOC

N

L

L

ESUF

N

DER

NWORB

EULB

DER

NWORB

EULB

EROCETIRREF

CNLNL

OT

UDI

8-4

SM LEXDCI 1-E.1 GB

REFRIGERATION DIAGRAMS

CONTENTS

9. REFRIGERATION DIAGRAMS

9.1 Heat Pump Models

9.1.1 LEX 25, 35, 50, 60 / DCI 25, 35, 50, 60 Cooling Mode

EEV

9.1.2 LEX 25, 35, 50, 60 / DCI 25, 35, 50, 60 Heating Mode

EEV

SM LEXDCI 1-E.1 GB

9-1

REFRIGERATION DIAGRAMS

CONTENTS

9.1.3 LEX 72 / DCI 72 Z

OUTDOOR UNIT

Sensor

INDOOR UNIT

Sensor

Outdoor coil

Reverse

valve

Strainer

COOLING & DRY MODE

OUTDOOR UNIT

EEV

Compressor

Strainer

Valves

Flared

connection

Indoor coil

INDOOR UNIT

Sensor

9-2

Outdoor coil

Reverse

Strainer

valve

Compressor

Valves

EEV

Strainer

HEATING MODE

Revision Y07 -00

Flared

connection

Sensor

Indoor coil

SM LEXDCI 1-E.1 GB

10. ELECTRICAL CONNECTIONS

CONTENTS

10.1 LEX 25, 35, 50, 60 DCI

1

3

2

ELECTRICAL CONNECTIONS

ESF-PWR

COOL

ESF-EN

HEAT

RESET

MODE

5/C

4/L

L

N

A

4

N

4/L

5/C

7

6

B

5

SM LEXDCI 1-E.1 GB

1. Indoor unit terminal

2. Ground wire.

3. Indoor coil.

4.Power cable in the indoor side.

5. Multiple wire cable.

6. Cable clamp.

7. Outdoor unit wire terminal.

A. OUTDOOR B. INDOOR

10-1

ELECTRICAL CONNECTIONS

CONTENTS

10.2 LEX 72 DCI

1

ESF-PWR

COOL

5/C

ESF-EN

HEAT

RESET

MODE

4/L

L

N

3

2

7

A

1. Indoor unit terminal

2. Ground wire.

3. Indoor coil.

4. Multiple wire cable.

N

4/L

5/C

6

5

B

4

5. Cable clamp.

6. Outdoor unit wire terminal.

7. Power cable in the outdoor side
(only for outdoor unit power supply)

10-2

A. OUTDOOR B. INDOOR

SM LEXDCI 1-E.1 GB

CONTROL SYSTEM

CONTENTS

11. CONTROL SYSTEM for LEX 25, LEX 35 DCI

11.1 General Functions and Operating Rules

The DCI software is fully parametric.
All the model dependent parameters are shown in Blue color and with Italic style [parameter].
The parameters values are given in the last section of this control logic chapter of the service
manual.

11.1.1 System Operation Concept

The control function is divided between indoor and outdoor unit controllers. Indoor unit is the
System ‘Master’, requesting the outdoor unit for cooling/heating capacity supply. The outdoor unit is
the system nless it enters into a protection mode'Slave’ and it must supply the required capacity
avoiding it from supplying the requested capacity.
The capacity request is transferred via indoor to outdoor communication, and is represented by a
parameter called ‘NLOAD’. NLOAD is an integer number with values between 0 and 127, and it
represents the heat or cool load felt by the indoor unit.

11.1.2 Compressor Frequency Control

11.1.2.1 NLOAD setting

The NLOAD setting is done by the indoor unit controller, based on a PI control scheme.
The actual NLOAD to be sent to the outdoor unit controller is based on the preliminary LOAD
calculation, the indoor fan speed, and the power shedding function.

NLOAD limits as a function of indoor fan speed:
Indoor Fan Speed Maximum NLOAD Cooling Maximum NLOAD Heating
Low
Medium
High
Turbo
Auto

NLOAD limits as a function of power shedding:
Mode Power Shedding OFF Power Shedding ON
Cool No limit Nominal Cooling
Heat No limit Nominal Heating

Max NLOADIF1C
Max NLOADIF2C
Max NLOADIF3C
Max NLOADIF4C
Max NLOADIF5C

127
127
127
127
127

11.1.3 Target Frequency Setting

The compressor target frequency is a function of the NLOAD number sent from the indoor
controller and the outdoor air temperature.
Basic Target Frequency Setting:

NLOAD Target Frequency
127
10 < NLOAD < 127 Interpolated value between minimum and maximum frequency
10
0 Compressor is stopped

SM LEXDCI 1-E.1 GB

Maximum frequency

Minimum frequency

11-1

CONTROL SYSTEM

CONTENTS

Target frequency limits as a function of outdoor air temperature )OAT(:
OAT Range Cool mode limits Heat mode limits
OAT No limit<6
6≤OAT<15
15 ≤ OAT < 24
24 ≤ OAT No limit

MaxFreqAsOATC

MaxFreqAsOAT1H

MaxFreqAsOAT2H

11.1.4 Frequency Changes Control

Frequency change rate is 1 Hz/sec.

11.1.5 Compressor Starting Control

Frequency

Step 3

Step 2

Step 1

1

Minute

1

Minute

Time

Min 10 Minutes

11.1.6 Minimum On and Off Time

3 minutes.

11.1.7 Indoor Fan Control

10 Indoor fan speeds are determined for each model. 5 speeds for cool/dry/fan modes and 5
speeds for heat mode.
When user sets the indoor fan speed to a fixed speed )Low/ Medium/ High(, unit will operate
constantly at set speed.
When Auto Fan is selected, indoor unit controller can operate in all speeds. The actual speed is set
according to the cool/heat load.

11.1.7.1 Turbo Speed

The Turbo speed is activated during the first 30 minutes of unit operation when auto fan speed is
selected and under the following conditions:
Difference between set point and actual room temperature is bigger then 3 degrees.
Room temperature 22 for cooling, or 25 for heating.><

11-2

SM LEXDCI 1-E.1 GB

CONTROL SYSTEM

CONTENTS

11.1.8 Heating Element Control

Heating element can be started if LOAD 0.8 mumNLOAD AND Indoor Coil temperature> * Maxi
<45.
The heating element will be stopped when LOAD 0.5 MaximumNLOAD OR if Indoor Coil<*
Temperature 50.>

11.1.9 Outdoor Fan Control

7 outdoor fan speeds are determined for each model. 3 speeds for cool and dry modes, and 3
speeds for heat mode, and a very low speed.
Outdoor fan speed is a function of compressor frequency and outdoor air temperature (OAT).
4 routines for fan control are determined. The control routine selection depends on operation
mode, compressor speed, outdoor air temperature (OAT) and heat sink temperature (HST).

Routine Conditions
A Heating with OAT 15<

or
Cooling with OAT > 20

0

C

0

C, or HST 50>0C
or
Faulty OAT

0

B Cooling with 20
C Cooling with 7
D Heating with OAT 15>

C>OAT>500C

0

C>OAT

0

C

Outdoor Fan Speed
Compressor Frequency (CF) Routine A Routine B Routine C Routine D
CF 0 OFF OFF OFF OFF=
10 ≤ CF < OFLowFreq Low Low Very Low Low
10 ≤ CF < OFMedFreq Medium Low Very Low Low

OFMedFreq ≤ CF High Low Low Medium

When compressor is switched to OFF and the heat sink temperature is above 55 degrees, the
outdoor fan will remain ON in low speed for up to 3 minutes.

11.1.10 EEV (electronic Expansion valve) Control

EEV opening is defined as EEV = EEVOL+EEV
EEVOLis the initial EEV opening as a function of the compressor frequency, operation mode, unit
model and capacity.
EEV

is a correction value for the EEV opening that is based on the compressor temperature.

CV

During the first 10 minutes of compressor operation EEV
Once the first 10 minutes are over, the correction value is calculated as follow: EEV
EEV
EEV

(N-1) + EEV

CV

is the correction based on the compressor temperature. A target compressor temperature

CTT

CTT

is set depending on frequency and outdoor air temperature, and the actual compressor
temperature is compared to the target temperature to set the required correction to the EEV
opening.

CV

CV

0.=
(n) =

CV

11.1.11 Reversing Valve (RV) Control

Reversing valve is on in heat mode.
Switching of RV state is done only after compressor is off for over 3 minutes.

11.1.12 Ioniser Control

Ioniser is on when unit is on AND indoor fan is on AND Ioniser power switch (on Ioniser) is on.

SM LEXDCI 1-E.1 GB

11-3

CONTROL SYSTEM

CONTENTS

11.1.13 Electro Static Filter )ESF( Control

ESF is on when ESF switch is on, Safety switch is pressed, unit is on, AND indoor fan is on.

11.1.14 Base Heater Control

0

When OAT is connected, Base Heater will be on when unit is in heating and OAT<2
When OAT is disconnected, Base Heater will be on when unit is in heating.

C.

11.2 Fan Mode

In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be ad ng to the differencejusti automatically according
between actual room temperature and user set point temperature.

11.3 Cool Mode

NLOAD is calculated according to the difference between actual room temperature and user set
point temperature by PI control.
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be ad8usted automatically according to the calculated
NLOAD.

11.4 Heat Mode

NLOAD is calculated according to the difference between actual room temperature and user set
point temperature by PI control.
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be adng to the calculated
NLOAD.

11.4.1 Temperature Compensation

In wall mounted, ducted, and cassette models, 3 degrees are reduced from room temperature
reading (except when in I-Feel mode), to compensate for temperature difference between high and
low areas in the heated room, and for coil heat radiation on room thermistor.
The temperature compensation can be enabled/disabled by shortening of J2 on the indoor unit
controller.

Model J2 Shorted J2 Opened
Wall mounted Compensation

Disabled
Cassette Compensation Enabled Compensation Disabled
Ducted Compensation Enabled Compensation Disabled
Floor/Ceiling Compensation

Disabled

Compensation Enabled

Compensation Enabled

11-4

SM LEXDCI 1-E.1 GB

11.4.2 Indoor Fan Control in Heat Mode

CONTENTS

Indoor fan speed depends on the indoor coil temperature:

CONTROL SYSTEM

ICTST

ICTVL ICTTICTHICTL

11.5 Auto Cool/Heat Mode

When in auto cool heat mode unit will automatically select between cool and heat mode according
to the difference between actual room temperature and user set point temperature )ΔT(.
Unit will switch from cool to heat when compressor is off for 3 minutes, and ΔT < -3.
Unit will switch from heat to cool when compressor is off for 5 minutes, and ΔT < -3.

11.6 Dry Mode

As long as room temperature is higher then the set point, indoor fan will work in low speed and
compressor will work between 0 and MaxNLOADIF1C Hz.
When the room temperature is lower than the set point, compressor will be switched OFF and
indoor fan will cycle 3 minutes OFF, 1 minute ON.

11.7 Protections

There are 5 protection codes.
Normal (Norm) – unit operate normally.
Stop Rise (SR) – compressor frequency can not be raised but does not have to be decreased.
HzDown1 (D1) – Compressor frequency is reduced by 2 to 5 Hz per minute.
HzDown2 (D2) – Compressor frequency is reduced by 5 to 10 Hz per minute.
Stop Compressor (SC) – Compressor is stopped.

11.7.1 Indoor Coil Defrost Protection

ICT<-2SCSCSCSCSC

-2 ≤ ICT < 0 D1 D1 D2 D2 D2
0 ≤ ICT < 2 SR SR D1 D2 D2
2 ≤ ICT < 4 SR SR SR D1 D2
4 ≤ ICT < 6 Norm Norm SR SR D1
6 ≤ ICT < 8 Norm Norm Norm SR SR
8 ≤ ICT Normal

SM LEXDCI 1-E.1 GB

ICT TrendICT
Fast
Increasing

Increasing No change Decreasing Fast

Decreasing

11-5

CONTROL SYSTEM

CONTENTS

11.7.2 Indoor Coil over Heating Protection

ICT TrendICT

Fast

Decreasing

Decreasing No Change Increasing Fast

Increasing
ICT55SCSCSCSCSC>
53 <ICT ≤ 55 D1 D1 D2 D2 D2
49 < ICT ≤ 53 SR SR D1 D2 D2
47<ICT≤49SRSRSRD1D2
45 < ICT ≤ 47 Norm Norm SR SR D1
43 < ICT ≤ 45 Norm Norm Norm SR SR
ICT ≤ 43 Normal

11.7.3 Compressor over Heating Protection

Compressor temperature can be in one of 5 control zones )4 in protection, and 1 normal(,
according to the following chart.

CTT

Stop-Compresor

CTTOH4

CTTOH3

CTTOH2

CTTOH1

Control Status Compressor Temperature

P3

P2

P1

Normal

Else

Increases
P1 Norm SR
P2 D1 SR
P3 D2 D1
Stop Compressor SC

11.7.4 Compressor over Current Protection

CCR

Stop-Compresor

CCROC4

11-6

CCROC3

HzDown2

HzDown1

CCROC2

Stop-Rise

CCROC1

Normal

SM LEXDCI 1-E.1 GB

CONTROL SYSTEM

CONTENTS

11.7.5 Heat Sink Over Heating Protection (NA for DCI 25 and 35)

HST TrendHST

Decreasing No Change Increasing
HST SC SC SC>90
85<HST≤90D1D2D2
82 < HST ≤ 85 SR D1 D2
80 < HST ≤ 82 SR SR D1
78 < HST ≤ 80 Norm Norm SR
HST ≤ 78 Normal

11.7.6 Outdoor Coil Deicing Protection

11.7.6.1 Deicing Starting Conditions

Deicing operation will start when either one of the following conditions exist:
Case 1: OCT OAT – 8 AND TLD<>DI
Case 2: OCT OAT – 12 AND TLD 30 minutes.<>
Case 3: OCT is Invalid AND TLD DI>
Case 4: Unit is ust switched to STBY AND OCTj<OAT-8
Case 5: NLOAD 0 AND OCT OAT -8=<

OCT – Outdoor Coil Temperature
OAT – Outdoor Air Temperature
TLD – Time from Last Deicing
DI – Deicing Interval (Time Interval Between Two Deicing)

Deicing interval time when compressor is first started in heat mode, is 10 minutes if OCT < -2, and
is 40 minutes in other cases.
Deicing interval time is changed (increased/ decreased in 10 minutes steps) as a function of
deicing time. If deicing time is shorter then former deicing time, the deicing interval time will be
increased. If deicing time is longer then former deicing time, the deicing interval time will be
decreased.

SM LEXDCI 1-E.1 GB

11-7

CONTROL SYSTEM

T

CONTENTS

11.7.6.2 Deicing Protection Procedure

OCT

12

0

Threshold

COMP

RV

OFAN

EEV

ON

HEAT

COOL

ON

OFF

Any

T1 T2

EEVDeicerOpen

36 seconds, T3 nds= 6 seco

T1

max. 12 minutes

DT

T3 T3

11.8 Condensate Water Over Flow Protection

Each of the pins P1, P2, P3 can have two options:
1 – When it is shorted with P4
0 – When it is not shorted to P4

11.8.1 3 Levels Logic (used in floor/ceiling models)

P2 P3 Level

00 L0
1 0 L1
11 L23&
01 L4

11-8

SM LEXDCI 1-E.1 GB

Water Level

CONTENTS

LEVEL4

LEVEL 3

LEVEL1

Pump

NLOAD

OPER LED

CONTROL SYSTEM

ON

OFF

ANY

0

BLINK

NORMAL

11.8.2 1 Level Logic (used in all models except for floor/ceiling
models)

P2 P3 Level

Water Level

OPER

LED

NLOAD

PUMP

Don`t
care
Don`t
care

Overflow

Normal

ON

OFF

BLINK

ANY

0

ON

OFF

1 Normal

0 Overflow

Overflow when

unit is ON

NLOAD is
forced to 0

8min 8min

Overflow when

unit is OFF

8min

11.9 Indoor Unit Dry Contact

Indoor unit Dry contact has two alternative functions that are selected by J8.

J8 Presence Detector Connection No Limit Forced to STBY=Open
J8 Power Shedding Function No Limit Limit NLOAD=Open

SM LEXDCI 1-E.1 GB

Function Contact = Open Contact = Short

11-9

CONTROL SYSTEM

CONTENTS

11.10 Operating the Unit from the Mode Button

Forced operation allows to start, stop and operate in Cooling or Heating, in pre-set temperature
according to the following table:

Forced operation Mode Pre-set Temperature
Cooling 200C

0

Heating 28

C

11.11 On Unit Controls and Indicators

11.11.1 Indoor Unit Controller Controls and Indicators For All Models
Except for Floor/Ceiling model

STAND BY

INDICATOR

OPERATION INDICATOR

TIMER INDICATOR Lights up during Timer and Sleep operation.

FILTER INDICATOR Lights up when Air Filter needs to be cleaned.

COOLING INDICATOR

HEATING INDICATOR

Mode SWITCH

(COOL/HEAT/OFF)

RESET / FILTER

SWITCH

Lights up when the Air Conditioner is connected to power and ready to
receive the R/C commands
Lights up during operation.
Blinks for 300 msec., to announce that a R/C infrared signal has
been received and stored.
Blinks continuously during protections (according to the relevant spec
section).

Lights up when system is switched to Cool Mode by using the Mode
Switch on the unit.
Lights up when system is switched Heat Mode by using the Mode
Switch on the unit.
Every short pressing , the next operation mode is selected, in this order
: SB → Cool Mode → Heat Mode → SB →
In long pressing system enters diagnostic mode.
For short pressing:
When Filter LED is on - turn off the FILTER INDICATOR after a clean
filter has been reinstalled.
When Filter LED is off able/disable the buzzer announcer, if
selected.

11-10

SM LEXDCI 1-E.1 GB

11.11.2 Indoor Unit Controls and Indicators for LCD Display

CONTENTS

STBY Cool Heat Auto Fan Dry
OFF SPT(1*)

SPT(1*)

SPT(1*)SPT(1*) SPT(1*) SPT(1*)

CONTROL SYSTEM

OFF(2*)

OFF(2*) OFF(2*) OFF(2*) OFF(2*) OFF(2*) OFF(2*)

(Low)

(Med)

(High)

(Turbo)

(Auto)
Backlight(red) OFF OFF ON(3*) ON(3*)
Backlight(green) OFF ON(3*) OFF

OFF

OFF

OFF

OFF

OFF

User
setting
IFAN
speed

ON(2*)ON(2*) ON(2*) ON(2*) ON(2*)

User
setting
IFAN
speed

User
setting
IFAN
speed

ON(3*)

User
setting
IFAN
speed

ON(3*)
ON(3*) ON(3*)

User
setting
IFAN
speed

OFF

SM LEXDCI 1-E.1 GB

11-11

CONTROL SYSTEM

CONTENTS

11.11.3 Indoor Unit Controller Controls and Indicators for Floor/Ceiling
Model

STANDBY
INDICATOR

OPERATE
INDICATOR

(4)

TIMER
INDICATOR
FILTER
INDICATOR
COOLING
INDICATOR
HEATING
INDICATOR
FAN MODE
INDICATOR

(4)

FAN SPEED
INDICATORS

TEMP.
SETTING
INDICATORS
FAN SPEED
BUTTON

TEMP.
SETTING UP
BUTTON
TEMP.
SETTING
DOWN BUTTON

MODE
BUTTON

POWER
BUTTON
RESET /
FILTER
BUTTON

Lights up when the Air Conditioner is connected to power and is ready
for operation

1. Lights up during operation.

2. Blinks for 300 msec., to announce that a R/C infrared signal
has been received and stored.

3. Blinks continuously during protections (according to the relevant spec
section).

Lights up during Timer and Sleep operation.

1. Lights up when Air Filter needs to be cleaned.

2. Blinks during Water Over Flow in PXD models. (Cf. Sect. 7.3)
Lights up when system is switched to Cool Mode by using the Mode
Switch on the unit.
Lights up when system is switched Heat Mode by using the Mode
Switch on the unit.
Lights up in Fan Mode activated by local switches.

L -- Lights up when IFAN setting is Low.
M -- Lights up when IFAN setting is Medium.
H -- Lights up when IFAN setting is High.
A -- Lights up when IFAN setting is Auto.
Each one of the seven indicators indicates the following SPT: 18, 20,
22, 24, 26, 28, 30 ]

o

c[. The odd number temperatures are indicated by
turning on the two adcent indicators.
Press this button to change the speed of the IFAN. Each pressing
change the speed in the sequence of:

..... L → M → H → Auto → L → ...

Pressing this button increases the SPT by 1
Note: The Max SPT is 30

Pressing this button decreases the SPT by 1
Note: The Min SPT is 18

o

C.

o

C.

o

C.

o

C.

Every short pressing , the next operation mode is selected, in this order
: SB → Cool Mode → Heat Mode → SB →
In long pressing system enters diagnostic mode.
Toggle the unit between OPER & STBY modes.

For short pressing:
When Filter LED is on - turn off the FILTER INDICATOR after a clean
filter has been reinstalled.
When Filter LED is off able/disable the buzzer announcer, if
selected.
In long pressing system enters set up mode (if in SB).

11.11.4 Outdoor Unit Controller Indicators

Unit has three LED
SB LED is ON when power is ON (230 VAC, even when no communication).
STATUS LED is ON when COMP is ON, and Blinks according to diagnostics mode definitions
when either fault or protection occurs.
FAULT LED Blinks according to diagnostics mode definitions when either fault or protection
occurs.

11-12

SM LEXDCI 1-E.1 GB

CONTROL SYSTEM

CONTENTS

11.12 Test Mode

11.12.1 Entering Test Mode

System can enter Test mode in two ways:
Automatically when the following conditions exists for 30 minutes continuously:
Mode l, Set point 16, Room temper= Coo = ature = 27±1, Outdoor temperature = 35±1
Or
Mode = Heat, Set point = 30, Room temperature = 20±1, Outdoor temperature = 7±1
Manually when entering diagnostics with the following settings:
Mode = Cool, Set point = 16
Mode = Heat, Set point = 30

11.12.2 Unit Operation in Test Mode

In test mode, the unit will operate in fixed settings according to the indoor fan speed setting:

Indoor Fan Speed Setting Unit Setting
Low Minimum Capacity Setting
High Nominal Capacity Setting
Auto Maximum Capacity Setting
During test mode, protections are disabled, except for stop compressor status.

SM LEXDCI 1-E.1 GB

11-13

CONTROL SYSTEM

CONTENTS

11.13 SW Parameters

11.13.1 Indoor Units SW Parameters

General Parameters for All Models:

Parameters defining the indoor fan speed as a function of Indoor Coil temperature in
heat mode (ICT):

ICTST Speed ICT to stop indoor fan 25
ICTVLSpeed ICT to go down to very low speed 28
ICTLSpeed ICT to start in very low speed 30
ICTHSpeed ICT to start in increase speed from very low 32
ICTTSpeed ICT to enable Turbo fan speed 40

Model Depended Parameters:

Parameter name

NLOAD limits as a function of selected indoor fan speed

MaxNLOADIF1C 40 40
MaxNLOADIF2C 53 53
MaxNLOADIF3C 120 120
MaxNLOADIF4C 127 127
MaxNLOADIF5C 127 127

IFVLOWC 700 700
IFLOWC 800 800
IFMEDC 900 950
IFHIGHC 1050 1100
IFTURBOC 1150 1200
IFVLOWH 700 700
IFLOWH 800 850
IFMEDH 950 1000
IFHIGHH 1100 1150
IFTURBOH 1200 1250

Nominal Compressor Frequency

NomLoadC 40 62
NomLoadH 55 67

Parameter Name

NLOAD limits as a function of selected indoor fan speed

MaxNLOADIF1C 40 40 40 40
MaxNLOADIF2C 53 56 56 60
MaxNLOADIF3C 120 90 90 90
MaxNLOADIF4C 127 90 90 90
MaxNLOADIF5C 127 90 90 90

Nominal Compressor Frequency

NomLoadC 40 60 56 63

DCI 25 DCI 35

Indoor Fan speeds

K 25 K 35 K 35S K 50

Wall Mounted Models

Cassette Models

NomLoadH 55 69 73 80

11-14

SM LEXDCI 1-E.1 GB

11.13.2 Outdoor Units SW Parameters

CONTENTS

Parameter Name DCI25 DCI35 DCI 50 DCI50 DUO

Compressor Parameters

MinFreqC 30 33 20 20

MaxFreqC 64 80 85 97

MinFreqH 30 35 20 26
MaxFreqH 81 93 99 106
Step1Freq 60 60 60 60
Step2Freq 70 70 70 80
Step3Freq 90 90 90 90

Frequency limits as a function of outdoor air temperature

MaxFreqAsOATC 50 50 64 62
MaxFreqAsOAT1H 65 75 85 85
MaxFreqAsOAT2H 60 60 60 60

CONTROL SYSTEM

Compressor Over Heating Protection

CTTOH1 94 94 94 90
CTTOH2 98 98 98 95
CTTOH3 102 102 102 102
CTTOH4 105 105 105 105

Compressor Over Current Protection [A]

CCR01 7.1 7.1 10 10
CCR02 7.5 7.5 10.5 10.5
CCR03 7.9 7.9 10.8 10.8
CCR04 8.3 8.3 11.2 11.2

Outdoor Fan Speed (RPM)

VL 200 200 200 200
OFLOWC 550 550 600 600
OFMEDC 700 700 760 830

OFMAXC 830 830 920 920
OFLOWH 550 550 600 600
OFMEDH 700 700 830 920

OFMAXH 830 830 1000 1000

SM LEXDCI 1-E.1 GB

Outdoor Fan Limit Control

OFLowFreq 45 45 40 40

OFMedFreq 57 57 70 70

11-15

CONTROL SYSTEM

CONTENTS

12. CONTROL SYSTEM for LEX 50, LEX 60, LEX 72 Z DCI

12.1 General Functions and Operating Rules

The DCI software is fully parametric.
All the model dependent parameters are shown in Blue color and with Italic style [parameter].
The parameters values are given in the last section of this control logic chapter of the service
manual.

12.1.1 System Operation Concept

The control function is divided between indoor and outdoor unit controllers. Indoor unit is the system
‘Master’, requesting the outdoor unit for cooling/heating capacity supply. The outdoor unit is the
system ‘Slave’ and it must supply the required capacity unless it enters into a protection mode
avoiding it from supplying the requested capacity.
The capacity request is transferred via indoor to outdoor communication, and is represented by
aparameter called ‘NLOAD’. NLOAD is an integer number with values between 0 and 127, and it
represents the heat or cool load felt by the indoor unit.

12.1.2 Compressor Frequency Control

12.1.2.1 NLOAD setting

The NLOAD setting is done by the indoor unit controller, based on a PI control scheme.
The actual NLOAD to be sent to the outdoor unit controller is based on the preliminary LOADcalculation,
the indoor fan speed, and the power shedding function.
NLOAD limits as a function of indoor fan speed:

Indoor Fan Speed Maximum NLOAD Cooling Maximum NLOAD Heating

Indoor Fan Speed Maxium NLOAD Cooling Maxium NLOAD Heating

Low MaxNLOADIF1C MaxNLOADIF1H
Medium MaxNLOADIF2C MaxNLOADIF2H
High MaxNLOADIF3C MaxNLOADIF3H
Turbo MaxNLOADIF4C MaxNLOADIF4H
Auto MaxNLOADIF5C MaxNLOADIF5H

NLOAD limits as a function of power shedding:

Mode Power Shedding OFF Power Shedding ON
Cooling No limit Nominal Cooling
Heating No limit Nominal heating

12.1.3 Target Frequency Setting

The compressor target frequency is a function of the NLOAD number sent from the indoor
controller and the outdoor air temperature.

Basic Target Frequency Setting:

SM LEXDCI 1-E.1 GB

12.1.3.1 Target Frequency Setting for DCI 50 / 60 / 72 Z

NLOAD Target Frequency

127 Maximum Frequency
10<NLOAD<127 Interpolated value between minimum and maximum frequency
10 Minimum frequency
0 Compressor is stopped

12-1

CONTROL SYSTEM

CONTENTS

Target frequency limits as a function of outdoor air temperature (OAT):

OAT Range Cooling Mode limits Heating Mode limits

OAT < 6

6 ≤ OAT < 15 MaxFreqAsOAT1H
15 ≤ OAT < 28

28≤ OAT No limit

12.1.3.2 Target Frequency Setting for DCI 72 / 80

The compressor Target Speed is calculated according to the following formula:

load

MaxFreqAsOATC






,maxarg

MaxSpeedMinSpeedSpeedetT

No limit

MaxFreqAsOAT2H

ODUNload



127






MiniSpeed, MaxSpeed are defined as following:

When the unit is in the cool mode, MiniSpeedC = 15Hz, MaxSpeed = 75Hz
When the unit is in the heat mode, MiniSpeedH = 20Hz, MaxSpeed = 95Hz

ODU NLOAD is caculated according to the IDU NLoad:



*3

 127,

NLOADODU

min

IDUNLOAD



ODUCode







OAT ODUCodeC ODUCodeC IDUNLOAD

≤-5 3 3
≤-5 3.8 3

Refer to sect.112.1.2.1

12.1.4 Frequency Changes Control

When the unit is running normally , the compressor frequency change rate is 1 Hz/sec.

12.1.5 Compressor Starting Control

12.1.5.1 Compressor starting control for DCI 50 / 60 / 72 Z

Step3

Step2

Step1

1

Minute

1

Minute

Min 10 Minutes

Time

12-2

SM LEXDCI 1-E.1 GB

CONTROL SYSTEM

CONTENTS

12.1.5.2 Compressor starting control for DCI 72 / 80

Step 1

Whenever the compressor starts up, after it has been off for more than 45 minutes, the compressor
frequency cannot go below Step1RPS for 3 continuous minutes (this rule comes to ensure oil return
to the compressor).

Step 2

The compressor speed cannot go above Step2RPS once after each compressor start up for 3
continuous minutes (this rule comes to prevent oil exit from the compressor after its start up).

Step 3

The speed cannot go higher than Step3RPS unless it was operating for more than 1 continuous
minutes between Step3RPS – 5 and Step3RPS .
After passing above Step3RPS, this rule is re-applied when passing below Step3RPS-5.

12.1.6 Minimum On and Off Time

3 minutes

12.1.7 Indoor Fan Control

8 Indoor fan speeds are determined for each model. 4 speeds for cool/dry/fan modes and 4 speeds
for heat mode.
When user sets the indoor fan speed to a fixed speed (Low/ Medium/ High), unit will operate constantly
at set speed.
When Auto Fan is selected, indoor unit controller can operate in all speeds. The actual speed is set
according to the cool/heat load.

12.1.7.1 Turbo Speed

The Turbo speed is activated during the first 30 minutes of unit operation when auto fan speed is
selected and under the following conditions:
Difference between set point and actual room temperature is bigger then 3 degrees.
Room temperature > 22 for cooling, or < 25 for heating.

12.1.8 Outdoor Fan Control

12.1.8.1 Outdoor Fan Control for DCI 50 / 60

7 outdoor fan speeds are determined for each model. 3 speeds for cool and dry modes, and 3
speeds for heat mode, and a very low speed.
Outdoor fan speed is a function of compressor frequency and outdoor air temperature (OAT).
4 routines for fan control are determined. The control routine selection depends on operation mode,
compressor speed, outdoor air temperature (OAT) and heat sink temperature (HST).

Routine Conditions

Heating with OAT < 15°C
or

A

B Cooling with 20°C > OAT > 7°C
C Cooling with 7°C > OAT
D Heating with OAT > 15°C

Cooling with OAT > 20°C,
or
Faulty OAT

SM LEXDCI 1-E.1 GB

12-3

CONTROL SYSTEM

CONTENTS

Compressor

Target Frequency

Freq=0 OFF OFF OFF OFF

10 ≤ Freq < OFLowFreq Low Low VL Low

OFLowFreq ≤ Freq< OFMedFreq Medium Low VL Low

OFMedFreq≤ Freq High Low Low Medium

Routin

A

OFAN Speed

Routin

B

Routin

C

Routin

D

When compressor is switched to OFF and the heat sink temperature is above 55 degrees, the
outdoor fan will remain ON in low speed for up to 3 minutes.

OFAN State
at Cool Mode

A

B

C

3 Degrees

Note: Periorities A>B>C

3 Degrees

7

20

HST

Change To Higher

OFAN Cool state (*1)

50

OAT

45

(*1) If State C, change to B

Change To lower
OFAN Cool state

If State B, change to A

12.1.8.2 Outdoor Fan Control for DCI 72 / 72 Z / 80

OFAN operates between any speed OFMinRPM to OFMaxRPM.

The fan speed is also related to protections and OMT value.

* For DCI 72Z, in heating mode the OFAN speed is related to OCT.

12.1.9 EEV (Electronic Expansion Vavle) Control

12.1.9.1 EEV Control for DCI 50 / 60

EEV opening is defined as EEV = EEVOL + EEVCV
EEVOL is the initial EEV opening as a function of the compressor frequency, operation mode, unit
model and capacity.
EEVCV is a correction value for the EEV opening that is based on the compressor temperature.
During the first 5 minutes of compressor operation EEVCV = 0.
Once the first 5 minutes are over, the correction value is calculated as follow: EEVCV(n) =
EEVCV(n-1) + EEVCTT
EEVCTT is the correction based on the compressor temperature. A target compressor temperature
is set depending on frequency and outdoor air temperature, and the actual compressor temperature
is compared to the target temperature to set the required correction to the EEV opening

.

12-4

SM LEXDCI 1-E.1 GB

CONTROL SYSTEM

CONTENTS

12.1.9.2 EEV Control for DCI 72 / 72 Z / 80

The target EEV value is the sum of open loop value (OL) and a result of the accumulative
correction values (CV).



EEVEEVEEV



The EEV intial value(OL) is defined as follow:

EEV

= EEVBaseOpenLoop + EEVOpenLoopCpctyCrct + EEVTubeCompnst

OL

CVOL

Basic EEV open loop Open Loop correction

EEV tube Length

compensation

Mode 72/80 72/80 72/80

COOL 220 25 0

HEAT 170 30 0

*For DCI72Z

The initial EEV

EEVCV is a correction value for the EEV opening that is based on the compressor temperature,
During the first 6 minutes after SB the correction is not calculated. After that the correction value is
updated every 30 seconds.

12.1.10 RV(Reversing Valve) Control

Reversing valve is on in heat mode.
Switching of RV state is done only after compressor is off for over 3 minutes.

12.1.11 Ioniser Control

Ioniser is on when unit is on ,AND indoor fan is on ,AND Ioniser power switch (on Ioniser) is on.

is defined in accordance to the compressor frequency

OL

12.1.12 Base Heater Control

The base heater will be working only when RV is “ON” according to the following graph:

Base

Heater

OFF

ON

0

2

OAT

When OAT is faulty the base heater will be “ON” continuously in HEAT mode.

12.2 Fan Mode

In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be adjusted automatically according to the differencebetween
actual room temperature and user set point temperature.

SM LEXDCI 1-E.1 GB

12-5

CONTROL SYSTEM

CONTENTS

12.3 Cool Mode

NLOAD is calculated according to the difference between actual room temperature and user set
point temperature by PI control.
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be adjusted automatically according to the calculated
NLOAD.

12.4 Heat Mode

NLOAD is calculated according to the difference between actual room temperature and user set
point temperature by PI control.
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be adjusted automatically according to the calculated
NLOAD.

12.4.1 Temperature Compensation

In wall mounted, ducted, and cassette models, 3 degrees are reduced from room temperature
reading (except when in I-Feel mode), to compensate for temperature difference between high and
low areas in the heated room, and for coil heat radiation on room thermistor.
The temperature compensation can be enabled/disabled by shortening of J2 on the indoor unit
Controller

Model J2 Shorted J2 Opened
Wall mounted Compensation Disabled Compensation Enabled
Cassette Compensation Enabled Compensation Disabled
Ducted Compensation Enabled Compensation Disabled
Floor/Ceiling Compensation Disabled Compensation Enabled

12.4.2 Indoor Fan Control in Heating Mode

Indoor fan speed depends on the indoor coil temperature:

12.5 Auto Cool/Heat Mode

When in auto cool heat mode unit will automatically select between cool and heat mode according
to the difference between actual room temperature and user set point temperature (.T). Unit will
switch from cool to heat when compressor is off for 3 minutes, and .T < -3.
Unit will switch from heat to cool when compressor is off for 5 minutes, and .T < -3.

12-6

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CONTROL SYSTEM

CONTENTS

12.6 Dry Mode

As long as room temperature is higher then the set point, indoor fan will work in low speed and
compressor will work between 0 and MaxNLOADIF1C Hz.
When the room temperature is lower than the set point, compressor will be switched OFF and indoor
fan will cycle 3 minutes OFF, 1 minute ON.

12.7 Protections

There are 5 protection codes.
Normal (Norm) – unit operate normally.
Stop Rise (SR) – compressor frequency can not be raised but does not have to be decreased.
HzDown1 (D1) – Compressor frequency is reduced by 2 to 5 Hz per minute.
HzDown2 (D2) – Compressor frequency is reduced by 5 to 10 Hz per minute.
Stop Compressor (SC) – Compressor is stopped.

12.7.1 Indoor Coil Defrost Protection

ICT Trend

ICT

Fast

Increasing No Change Decreasing Fast

Increasing

ICT< -2 SC SC SC SC SC

-2 ≤ ICT<0 D1 D1 D2 D2 D2

0 ≤ ICT < 2 SR SR D1 D2 D2

2 ≤ ICT< 4 SR SR SR D1 D2

4 ≤ ICT < 6 Norm Norm SR SR D1

6 ≤ ICT ≤ 8 Norm Norm Norm SR SR

ICT> 8 Norm

12.7.2 Indoor Coil Overheating Protection

12.7.2.1 Indoor Coil Overheating Protection For DCI 50 / 60 / 72 Z

ICT Trend

ICT

ICT >62 SC SC SC SC SC

60 ≤ ICT < 62 D1 D1 D2 D2 D2

55≤ ICT <60 SR SR D1 D2 D2
52≤ ICT < 55 SR SR SR D1 D2
48≤ ICT < 52 Norm Norm SR SR D1

45≤ ICT ≤ 48 Norm Norm Norm SR SR

ICT <45 Norm

Fast

Decreasing No Change Increasing

Decreasing

Fast

Increasing

SM LEXDCI 1-E.1 GB

12-7

CONTROL SYSTEM

p

r

CONTENTS

12.7.2.2 Indoor Coil Overheating Protection For DCI 72 / 80

ICT Trend

ICT

<-2 -2 -1,0,1 2 >2

ICT >62 SC SC SC SC SC

60 ≤ ICT < 62 D1 D1 D2 D2 D2

58≤ ICT <60 SR SR D1 D2 D2
56≤ ICT < 58 SR SR SR D1 D2
54≤ ICT < 56 Norm Norm SR SR D1

52≤ ICT ≤ 54 Norm Norm Norm SR SR

ICT <52 Norm

12.7.3 Compressor Overheating Protection

12.7.3.1 Compressor Overheating Protection for DCI 50 / 60 / 72 Z

Compressor temperature can be in one of 5 control zones (4 in protection, and 1 normal),according
to the following chart.

CTT

-Compresso

Sto

105

P3

102

P2

98

P1

94

Normal

Control Status

Compressor Temperature
Increases

Else

P1 Normal Stop Rise
P2 HzDown 1 Stop Rise
P3 HzDown 2 HzDown 1
Stop Compressor Stop Compressor

12-8

SM LEXDCI 1-E.1 GB

12.7.3.2 Compressor Overheating Protection for DCI 72 / 80

CONTENTS

CONTROL SYSTEM

CTT

Fast

Cool Heat

CTT >105 CTT >105 SC SC SC SC SC
100≤ CTT <

105
98≤CTT <100 95≤CTT <100 SR SR D1 D2 D2

93≤CTT < 100 85≤CTT < 95 SR SR SR D1 D1
90≤CTT ≤ 93 80≤CTT ≤ 85 Norm Norm Norm SR SR
CTT <90 CTT <80 Norm

100≤ CTT <

105

Decreasing

D1 D1 D2 D2 D2

Decreasing

CTT Trend

No

Change

Increasing

Increasing

12.7.4 Compressor Over Current Protection Only For DCI 50 / 60 / 72 Z

CCR

Stop-Compresor

CCROC4

CCROC3

HzDown1

CCROC2

CCROC1

Normal

HzDown2

Stop-Rise

Fast

12.7.5 Heat Sink Overheating Protection

12.7.5.1 Heat Sink Overheating Protection For DCI 50 / 60 / 72 Z

HST Trend

HST

Fast

Decreasing No Change Increasing

Decreasing

HST ≥ 90 SC SC SC SC SC
85 ≤ HST < 90 D1 D1 D2 D2 D2
82 ≤ HST < 85 SR SR D1 D2 D2

80≤ HST< 82 SR SR SR D1 D1

78 ≤ HST ≤ 80 Norm Norm Norm SR SR

HST < 78 Norm

SM LEXDCI 1-E.1 GB

Fast

Increasing

12-9

CONTROL SYSTEM

CONTENTS

12.7.5.2 Heat Sink Overheating Protection For DCI 72 / 80

HST

Delta HST

<-2 -2 -1,0,1 2 >2

HST≥ 81 SC SC SC SC SC
79 ≤ HST < 81 D1 D1 D2 D2 D2
75 ≤ HST < 79 SR SR D1 D2 D2

73≤ HST< 75 SR SR SR D1 D1

71 ≤ HST ≤ 73 Norm Norm Norm SR SR

HST < 71 Norm

12.7.6 System Over Power Protection Only For DCI 72 / 80

Power

< -2000 [-2000,0) 0 (0,2000] > 2000

PWR1 PWR2

PWR ≥ 3500 PWR ≥ 2900 SC SC SC SC SC

3300≤PWR < 3500 2750≤PWR < 2900 D1 D1 D2 D2 D2
3100 ≤PWR < 3300 2600≤PWR < 2750 SR SR D1 D2 D2
3000≤PWR < 3100 2450≤PWR < 2600 SR SR SR D1 D1

2950 ≤PWR ≤ 3000

PWR < 2950 PWR < 2300 Norm

2300 ≤PWR ≤

2450

Norm Norm Norm SR SR

Delta PWR

There are two sets of OVRPWR values, the selection of the values are set according to the state of
the Power-Shed input.
Power-Shed input open Set values 1
Power-Shed input sort Set values 2

12.7.7 Outdoor Coil Deicing Protection

12.7.7.1 Outdoor coil Deicing Protection For DCI 50 / 60 / 72 Z

► Entering Deicing Conditions

Deicing operation will start when either one of the following conditions exist:
Case 1: OCT < OAT – 8 AND TLD > DI
Case 2: OCT < OAT – 12 AND TLD > 30 minutes.
Case 3: OCT is Invalid AND TLD > DI
Case 4: Unit is just switched to STBY AND OCT < OAT – 8
Case 5: NLOAD = 0 AND OCT < OAT -8
Case 6: OCT<-19 AND TLD>60 minutes
All this condition will exist during 10 seconds
OCT – Outdoor Coil Temperature
OAT – Outdoor Air Temperature
TLD – Time from Last Deicing
DI – Deicing Interval (Time Interval Between Two Deicing)
Deicing interval time when compressor is first started in heat mode, is 10 minutes if OCT < -2, and
is 40 minutes in other cases.
Deicing interval time is changed (increased/ decreased in 10 minutes steps) as a function of deicing
time. If deicing time is shorter then former deicing time, the deicing interval time will be increased. If
deicing time is longer then former deicing time, the deicing interval time will be decreased.

12-10

SM LEXDCI 1-E.1 GB

► Deicing Operation Procedure

CONTENTS

OCT

12

0

Threshold

CONTROL SYSTEM

COMP

DeiceFreqChRV

RV

OFAN

EEV

ON

HEAT

COOL

ON

OFF

EEVDeicerOpen

Any

T1 T2

DT

max. 12 minutes

T3 T3

T1

T1=60 secondes;T2=36 secondes;T3=6 secondes

12.7.7.2 Outdoor coil Deicing Protection For DCI 72 / 80

► Entering Deicing Conditions

Deicing operation will start when either one of the following conditions exist:
Case 1: OCT < OAT – 8 AND TLD > DI
Case 2: OCT < OAT – 12 AND TLD > 30 minutes.
Case 3: OCT is Invalid AND TLD > DI
Case 4: Unit is just switched to STBY AND OCT < OAT – 8
Case 5: NLOAD = 0 AND OCT < OAT - 8
Case 6: OAT is invalid AND OCT< 8 AND TLD > DI AND Compressor ON Time > 15 minutes
All this condition will exist during 400 seconds
OCT – Outdoor Coil Temperature
OAT – Outdoor Air Temperature
TLD – Time from Last Deicing
DI – Deicing Interval (Time Interval between Two Deicing)
Deicing interval time when compressor is first started in heat mode, is 10 minutes if OCT < -2, and
is 40 minutes in other cases.
Deicing interval time is changed (increased/ decreased in 10 minutes steps) as a function of deicing
time. If deicing time is shorter then former deicing time, the deicing interval time will be increased. If
deicing time is longer then former deicing time, the deicing interval time will be decreased.

SM LEXDCI 1-E.1 GB

12-11

CONTROL SYSTEM

CONTENTS

► Deicing Operation Procedure

OCT

12

0

Threshold

COMP

RV

OFAN

EEV

ON

HEAT

COOL

ON

OFF

EEVDeicerOpen

Any

T1 T2

max. 12 minutes

DT

T3 T3

T1=50 secondes;T2=36 secondes;T3=6 secondes

12.7.8 Condensate Water Over Flow Protection

T1

Each of the pins P1, P2, P3 can have two options:
1 – When it is shorted with P4
0 – When it is not shorted to P4

► Water Level Protection-1 level

P1 P2 P3 Level

Don’t care Don’t care 1 Normal

Don’t care Don’t care 0 Overflow

(*) 1- Pin P1, P2, or P3 is connected to P4.

0- Pin P1, P2 or P3 is not connected to P4.

12-12

SM LEXDCI 1-E.1 GB

CONTROL SYSTEM

CONTENTS

Water Level

OPER

LED

NLOAD

PUMP

Overflow

Normal

ON

OFF

BLINK

ANY

0

ON

OFF

Overflow when

unit is ON

NLOAD is

forced to 0

8 min 8 min

Overflow when

unit is OFF

8 min

12.8 Indoor Unit Dry Contact

Indoor unit Dry contact has two alternative functions that are selected by J9.

Function Contact=open Contact=short

J9=open

Presence Detector

Connection

No limit Force to STBY

J9=short Power Shedding Function No limit Limit NLOAD

12.9 Operating the Unit from Mode Button

Forced operation allows to start, stop and operate in Cooling or Heating, in pre-set
temperature according to the following table:

Forced operation Mode Pre-set Temperature

Cooling 20°C

Heating 28°C

SM LEXDCI 1-E.1 GB

12-13

CONTROL SYSTEM

CONTENTS

12.10 On Unit Controls and Indicators

12.10.1 Indoor Unit controller Controls and Indicatiors for All Models
Except for Floor/Ceiling model

During OFF, Fan, Cool, Heat, Dry, and Auto modes (for operation in other modes, see at the
relevant spec paragraph):

STAND BY
INDICATOR

OPERATION
INDICATOR

TIMER INDICATOR Lights up during Timer and Sleep operation.

FILTER INDICATOR Lights up when Air Filter needs to be cleaned.

COOLING INDICATOR

HEATING INDICATOR

Mode SWITCH
(COOL/HEAT/OFF)

1. Lights up when the Air Conditioner is connected to power
and ready to receive the R/C commands

1. Lights up during operation.

2. Blinks for 300 msec., to announce that a R/C infrared
signal has been received and stored.

3. Blinks continuously during protections (according to the
relevant spec section).

Lights up when system is switched to Cool Mode by using the
Mode Switch on the unit.

Lights up when system is switched Heat Mode by using the Mode
Switch on the unit.

Every short pressing , the next operation mode is selected, in this
order : SB → Cool Mode → Heat Mode → SB → …
In long pressing system enters diagnostic mode.

For short pressing:
When Filter LED is on - turn off the FILTER INDICATOR

RESET / FILTER
SWITCH

after a clean filter has been reinstalled.
When Filter LED is off – enable/disable the buzzer
announcer, if selected.

In long pressing system enters set up mode (if in SB).

12.10.2 Outdoor Unit controller Indicatiors

Unit has three LED’s.
SB LED is ON when power is ON (230 VAC, even when no communication).
STATUS LED is ON when COMP is ON, and Blinks according to diagnostics mode definitions when
either fault or protection occurs.
FAULT LED Blinks according to diagnostics mode definitions when either fault or protection occurs.

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12.11 Test Mode

12.11.1 Entering Test Mode

System can enter Test mode in two ways:
Automatically when the following conditions exists for 30 minutes continuously:
Mode = Cool, Set point = 16, Room temperature = 27(+1/−2), Outdoor temperature = 35(+2/-1)
Or
Mode = Heat, Set point = 30, Room temperature = 20±1, Outdoor temperature = 7±(+1/-2)
Manually when entering diagnostics with the following settings:
Mode = Cool, Set point = 16
Mode = Heat, Set point = 30

12.11.2 Unit Operation in Test Mode

In test mode, the unit will operate in fixed settings according to the indoor fan speed setting:

Indoor FAN Speed Setting Unit Setting

Low Minimum Capacity Setting
Turbo Nominal Capacity Setting
Auto Maximum Capacity Setting

During test mode, protections are disabled, except for stop compressor status.

12.12 SW Parameters

12.12.1 Indoor Units SW Parameters

Model dependent parametes - KN

A

(KN-60)B(KN-72)C(KN-80)
Cap .Group 3 4 4
NomLoadC 81 61 67
NomLoadH 77 59 67
MaxNLOADIF1C 55 44 85
MaxNLOADIF2C 70 50 102
MaxNLOADIF3C 127 120 120
MaxNLOADIF4C 127 127 127
MaxNLOADIF5C 127 127 127
MinRTC 20 20 20
MaxNLOADRTC 127 127 127
MaxNLOADIF1H 127 127 127
MaxNLOADIF2H 127 127 127
MaxNLOADIF3H 127 127 127
MaxNLOADIF4H 127 127 127
MaxNLOADIF5H 127 127 127
MaxNLOADRTH 127 127 127
MaxRTH 27 27 27
MaxNLOADPSC 81 61 67
MaxNLOADPSH 77 59 67

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CONTROL SYSTEM

CONTENTS

Model dependent parameters - DNG

Unit

A

(DNG50)B(DNG60)C(DNG72)D(DNG80)

Cap .Group 3344
NomLoadC 62 77 57 60
NomLoadH 74 80 55 63
ICTSTSpeed 22 22 22 22
ICTVLSpeed 28 28 28 28
ICTLSpeed 30 30 30 30
ICTHSpeed 32 32 32 32
ICTTSpeed 40 40 40 40
MaxNLOADIF1C 50 50 63 78
MaxNLOADIF2C 63 63 85 100
MaxNLOADIF3C 120 120 115 127
MaxNLOADIF4C 127 127 127 127
MaxNLOADIF5C 127 127 127 127
MinRTC 20 20 20 20
MaxNLOADRTC 127 127 127 127
MaxNLOADIF1H 127 127 127 127
MaxNLOADIF2H 127 127 127 127
MaxNLOADIF3H 127 127 127 127
MaxNLOADIF4H 127 127 127 127
MaxNLOADIF5H 127 127 127 127
MaxNLOADRTH 127 127 127 127
MaxRTH 27 27 27 27
MaxNLOADPSC 62 77 57 60
MaxNLOADPSH 74 80 55 63

Model dependent parameters - WNG

Parameter name

25 35 50 60 72 80

NLOAD limits as a function of selected indoor fan speed
MaxNLOADIF1C 40 40 45 50 53 68
MaxNLOADIF2C 53 53 62 85 75 90
MaxNLOADIF3C 120 120 120 120 105 120
MaxNLOADIF4C 127 127 127 127 127 127
MaxNLOADIF5C 127 127 127 127 127 127

Indoor Fan speeds

IFVLOWC 700 700 700 800 850 850
IFLOWC 800 800 900 1000 1000 1000
IFMEDC 900 950 1050 1100 1150 1150
IFHIGHC 1050 1100 1200 1250 1350 1300
IFTURBOC 1150 1200 1250 1300 1400 1350
IFVLOWH 700 700 700 800 900 900
IFLOWH 800 850 900 950 1050 1050
IFMEDH 950 1000 1100 1150 1200 1200
IFHIGHH 1100 1150 1250 1250 1350 1300
IFTURBOH 1200 1250 1300 1300 1400 1350

(WNG) Wall Mounted Models

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SM LEXDCI 1-E.1 GB

Model dependent parameters - PXD

CONTENTS

CONTROL SYSTEM

Unit

Cap .Group 3 3
NomLoadC 68 80
NomLoadH 77 82
MaxNLOADIF1C 40 50
MaxNLOADIF2C 60 85
MaxNLOADIF3C 90 127
MaxNLOADIF4C 90 127
MaxNLOADIF5C 90 127
MinRTC 20 20
MaxNLOADRTC 127 127
MaxNLOADIF1H 127 127
MaxNLOADIF2H 127 127
MaxNLOADIF3H 127 127
MaxNLOADIF4H 127 127
MaxNLOADIF5H 127 127
MaxNLOADRTH 127 127
MaxRTH 27 27
MaxNLOADPSC 68 80
MaxNLOADPSH 77 82

A

(PXD50)B(PXD60)C(PXD72)D(PXD80)

44
60 63
60 67

127 127
127 127
127 127
127 127
127 127

20 20

127 127
127 127
127 127
127 127
127 127
127 127
127 127

27 27
60 63
60 67

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CONTENTS

12.12.2 Outdoor Units SW Parameters:

Model dependent parameters for DCI 50 / 60

# Name Single DCI-50 Single DCI 60

1 MinFreqC 20 20

2 MaxFreqC 85 95
3 MinFreqH 20 26
4 MaxFreqH 95 94
5 NormAccel 1 1
6 NormDecel 1 1
7 Step1Freq 60 60
8 Step2Freq 70 70

9 Step3Freq 90 90
10 OFVL 20 20
11 OFLOWC 60 55
12 OFMEDC 76 70
13 OFMAXC 92 79
14 OFLOWH 60 55
15 OFMEDH 83 70
16 OFMAXH 100 79
17 OFANTESTMODEC 92 83
18 OFANTESTMODEH 100 83
19 OFDelTestMode 28 28
20 CTTOH1 94 94
21 CTTOH2 98 98
22 CTTOH3 102 102
23 CTTOH4 105 105
24 CCROC1 10 11.4
25 CCROC2 10.5 11.8
26 CCROC3 10.8 12.2
27 CCROC4 11.2 12.6
28 DEICT1 60 60
29 DEICT2 36 36
30 DEICT3 6 6
31 ProtFreqLimit 60 60
32 EEVDecierOpen 100 180
33 OptimDeicFreq 90 90
34 EEVMinOperOpenC 50 80
35 EEVMaxOperOpenC 380 380
36 EEVMinOperOpenH 50 60
37 EEVMaxOperOpenH 380 300
38 EEVNormRate 33 33
39 EEVHighRate 12 12
40 EEVMaxOpen 500 500
41 OFLowFreqC 40 35
42 OFMedFreqC 70 55
43 OFLowFreqH 40 40
44 OFMedFreqH 86 60
45 HeaterDisableFlag 0 0
46 DeiceFreqChRV 0 0
47 OATRefC 35 35
48 SUCT Enable 0 0

49 HST Enable 1 1
50 OAT Enable 1 1

51 OATRefH 7 7
52 MinTargCTTC 30 30
53 MaxTargCTTC 95 90
54 MinTargCTTH 40 45
55 MaxTargCTTH 95 90
56 DST 8 8
57 DSTF 12 12
58 OATLimitC 28 28
59 OATLimit1H 6 6
60 OATLimit2H 15 15
61 MaxFreqAsOATC 64 85
62 MaxFreqAsOAT1H 85 80
63 MaxFreqAsOAT2H 60 60

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Model dependent parameters for DCI 72 / 80

Compressor Parameters Value

MinOFFTime 3
MinOnTime 3
MaxCTT1 90
MaxCTT2 90
MinSpeedAsCTT1 26
MinSpeedAsCTT2 26
MaxSpeedC 75
MaxSpeedH 95
Step1RPS 40
Step2RPS 60
Step3RPS 75
NormAcc (sec/RPS) 1
NormDec (sec/RPS) 1
Down1(Sec/RPS) 12
Down2 (Sec/RPS) 7
DeiceAcc (Sec/RPS) 0.2
DeiceDec (Sec/RPS) 0.5

EEV Parameters Value

NormEEVRate 30
EEVCompOFFOpen 200

EEVCompOFFTime 60

EEVMaxOpen 500

EEVMinOperOpenC 60

EEVMaxOperOpenC 500

EEVMinOperOpenH 70

EEVMaxOperOpenH 500

EEVMinOperOpenHInIDU 60

EEVMaxOperOpenHInIDU 140

EEVIDUOFFOpen 130

Model dependent parameters for DCI 72 Z

No. Name

1 MinFreqC 15
2 MaxFreqC 70
3 MinFreqH 15
4 MaxFreqH 90
7 Step1Freq 35
8 Step2Freq 55

9 Step3Freq 90
10 OFMinRPM 8
11 OFMaxRPM 90
12 NightRPM 65
13 OFNNoiseMaxRPM 78
14 CTTOH1 90
15 CTTOH2 95
16 CTTOH3 100
17 CTTOH4 105
18 CCROC1 12.5
19 CCROC2 13.3
20 CCROC3 14.1
21 CCROC4 14.9
22 ProtFreqLimit 60
23 EEVMinOperOpenC 50
24 EEVMaxOperOpenC 480
25 EEVMinOperOpenH 50
26 EEVMaxOperOpenH 480
27 HeaterDisableFlag 0
28 HST Enable 1
29 OATLimitC 24
30 OATLimit1H 6
31 OATLimit2H 15
32 MaxFreqAsOATC 60
33 MaxFreqAsOAT1H 85
34 MaxFreqAsOAT2H 75
35 NormAccel 1
36 NormDecel 1

Single

DCI-72 Z

EEVMoveSteps 20

EEVTConstC 30

EEVTConstH 30

BlncTimTrnsStC 1

BlncTimStdyStC 1

BlncTimTrnsStH 1

BlncTimStdyStH 1
CompOffTimToTrnsSt 20

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CONTENTS

13. TROUBLESHOOTING

13.1 Troubleshooting for DCI 25 / 35 / 50 / 60 / 72Z

WARNING!!!

When Power Up – the whole outdoor unit controller, including the wiring, is under HIGH

VOLTAGE!!!

Never open the Outdoor unit before turning off the Power!!!

When turned off, the system is still charged (400V)!!!

It takes about 3 Min. to discharge the system.

Touching the controller before discharging may cause an electrical shock!!!

13.1.1 Single Split System failures and Corrective Actions

No Symptom Probable Cause Corrective Action

Power supply indicator

1

(Red LED) does not light
up.

Unit does not respond to

2

remote control message

Unit responds to remote
control message but

3

Operate indicator (Green
LED) does not light up

Indoor fan does not start

4

(louvers are opened and
Green LED does light up)

Indoor fan works when
unit is OFF, and indoor

5

fan speed is not changed
by remote control
command.

Compressor does not

6

start

Check power supply. If power

No power supply

Remote control message
not reached the indoor
unit

Problem with display
PCB

Unit in heat mode and
coil is still not warm.

Problem with PCB or
capacitor

PCB problem Replace controller

Electronics control
problem or protection

supply is OK, check display and
display wiring. if OK, replace
controller.

Check remote control batteries,
if batteries are OK, check display
and display wiring, if OK, replace
display PCB.
If still not OK replace controller.

Replace display PCB.
If still not OK replace controller.

Change to cool mode and check.

Change to high speed and Check
power supply to motor is higher
than 130VAC (for triack controlled
motor) or higher than 220VAC for
fixed speed motors, if OK replace
capacitor, if not OK replace
controller.

Perform diagnostics and follow
the actions described.

7

8

SM LEXDCI 1-E.1 GB

Compressor stops during
operation and Green LED
remains on

Compressor is on but
outdoor fan does not work

Electronic control or
power supply problem

Problem with outdoor
electronics or outdoor fan

Perform diagnostics and follow
the actions described.

Check outdoor fan motor
according to the procedure below,
if not OK replace controller.

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TROUBLESHOOTING

CONTENTS

No Symptom Probable Cause Corrective Action

Check RV power connections, if

Unit works in wrong mode

9

(cool instead of heat or
heat instead of cool)

All components are

10

operating properly but no
cooling or no heating

Compressor is over

11

heated and unit does not
generate capacity

Electronics or power
connection to RV

Refrigerant leak Check refrigeration system.

EEV problem Check EEV.

OK,
check RV operation with direct
230VAC power supply, if OK,
replace outdoor controller.

Units goes into
protections and

12

compressor is stopped
with no clear reason

Compressor motor is

13

generating noise and no
suction occurs

Water leakage from

14

indoor unit
Freezing of outdoor unit

in heat mode and outdoor

15

unit base is blocked with
ice

Unit operates with wrong

16

fan speeds or wrong
frequency

Control problem or
refrigeration system
problem

Phase order to
compressor is wrong

Indoor unit drainage tube
is blocked

Wrong jumper settings

Perform diagnostics , and follow
the actions described.

Check compressor phase order.

Check and open drainage tube.

Connect base heater.

Perform diagnostics, and check
if units is operating by EEPROM
parameters.

13.1.2 Checking the refrigeration system

Checking system pressures and other thermodynamic measures should be done when system is in
Test Mode (in Test mode, system operates in fixed settings). The performance curves given in this
manual are given for unit performance in test mode when high indoor fan speed is selected.
Entering test mode:
Set unit to Cool/16 degrees/High indoor fan speed, or Heat/30 degrees/High indoor fan speed, and
enter diagnostics.

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13.1.3 Judgment by Indoor/Outdoor Unit Diagnostics

Enter diagnostics mode - press for five seconds Mode button in any operation mode. Acknowledgment
is by 3 short beeps and lights of COOL and HEAT LED’s. Then, every short pressing of Mode button
will scroll between Indoor and Outdoor unit diagnostic modes by the acknowledgment of 3 short
beeps and lighting of COOL and HEAT LED’s.
During the Outdoor unit diagnostics all four Indoor LED’s (STBY, Operate, Filter and Timer) are
blinking. When Indoor diagnostics is displayed, all four LED’s (STBY, Operate, Filter and Timer) are
ON.

When system enters diagnostics mode, only one fault code is shown. Order of priority is from the
lower to the higher number. Diagnostics is continuously ON as long as power is ON. The current
system operation mode will not be changed.
If no fault occurred in the system, no fault code will be displayed during normal operation mode. The
last fault code will be displayed even if the system has recovered from that fault. The last fault will be
deleted from the EEPROM after the system has exit diagnostics mode.

In diagnostics mode, system fault / status will be indicated by blinking of Heat & Cool LEDs.
The coding method will be as follows:
Heat LED will blink 5 times in 5 seconds, and then will be shut off for the next 5 seconds. Cool LED
will blink during the same 5 seconds according to the following Indoor / Outdoor unit tables:
Note: 0 – OFF, 1-ON

13.1.4 Indoor Unit Diagnostics

No Problem 5 4 3 2 1

1 RT-1 is disconnected 0 0 0 0 1
2 RT-1 is shorted 0 0 0 1 0
3 RT-2 is disconnected 0 0 0 1 1
4 RT-2 is shorted 0 0 1 0 0
5 Reserved 0 0 1 0 1
7 Communication mismatch 0 0 1 1 1
8 No Communication 0 1 0 0 0
9 No Encoder 0 1 0 0 1

10 Reserved 0 1 0 1 0

11 Outdoor Unit Fault 0 1 0 1 1

… Reserved
17 Defrost protection 1 0 0 0 1
18 Deicing Protection 1 0 0 1 0
19 Outdoor Unit Protection 1 0 0 1 1
20 Indoor Coil HP Protection 1 0 1 0 0
21 Overflow Protection 1 0 1 0 1
22 Reserved
24 EEPROM Not Updated 1 1 0 0 0
25 Bad EEPROM 1 1 0 0 1
26 Bad Communication 1 1 0 1 0
27 Using EEPROM data 1 1 0 1 1
28 Model A 1 1 1 0 0
29 Model B 1 1 1 0 1
30 Model C 1 1 1 1 0

31 Model D 1 1 1 1 1

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CONTENTS

13.1.4.1 Indoor Unit Diagnostics and Corrective Actions

No. Fault Probable Cause Corrective Action

Sensor failures of

1

all types

Communication

2

mismatch

3 No Communication

4 No Encoder Indoor electronics or motor

5 Outdoor Unit Fault Outdoor controller problem

EEPROM Not

6

Updated

7 Bad EEPROM

Bad

8

Communication

Indoor and Outdoor
controllers are with
different versions

Communication or
grounding wiring is not
good.

System is using ROM
parameters and not
EEPROM parameters

Communication quality is
low reliability

Check sensor connections or
replace sensor

Replace Indoor controller

Check Indoor to Outdoor
wiring and grounding

Check motor wiring, if ok,
replace motor, if still not ok,
replace Indoor controller.

Switch to Outdoor
diagnostics.

No action, unless special
parameters are required for
unit operation.

No action, unless special
parameters are required for
unit operation.

Check Indoor to Outdoor
wiring and grounding

9

10

11

12

13

Using EEPROM
data

The power supply
indicator (red led)
doesn’t light up.

TThe operating
indicator (green
led) does not light
up

The operating
indicator (green
led) does not light
up when starting
from unit..

The indoor fan
does not function
correctly.

No problem. System is
using EEPRRRROM
parameters

There is no correct voltage
between the line and
neutral terminals on main
P.C.B.

The remote control
batteries are discharged

Check main P.C.B and
display P.C.B.

Check the voltage
between indoor fan
terminals on the main
P.C.B

-If the voltage is low repair
power supply.

-If there is no voltage repair
general wiring.

-If there is correct voltage
replace main or display
P.C.B’S

-Replace batteries of the
remote control

-Replace P.C.B if necessary.

- If there is voltage replace
capacitor or motor.

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TROUBLESHOOTING

CONTENTS

No. Fault Probable Cause Corrective Action

14

15

The outdoor fan
does not function
correctly.

The compressor
does not start up.

Check the voltage
between indoor fan
terminals on the main
P.C.B.

There is voltage between
outdoor fan terminals on
the outdoor unit.

There is no voltage
between outdoor fan
terminals on the outdoor
unit.

Check voltage on
compressor terminals on
the outdoor unit. (with
ampmeter)

Check if there is correct
voltage between
compressor terminals on
the outdoor unit.

- If there is no voltage
replace main P.C.B

- Replace capacitor or motor.

- Check and repair electrical
wiring between indoor and
outdoor units.

-If no voltage replace main
P.C.B.

- If low voltage repair power
supply.

-If the voltage corrrect
replace capacitor or
compressor.

-If there is no voltage repair
electrical wiring between
indoor and outdoor units.

16

17

18

19

The refrigeration
system does not
function correctly.

No cooling or
heating only indoor
fan works.

Only indoor fan
and compressor
working.

Only indoor fan
working.

Check for leaks or
restrictions, with
ampmeter, pressure guage
or surface thermometer.

Outdoor fan motor faulty
or other fault caused,
compresssor overload
protection cut out.

Outdoor fan blocked.

-Run capacitor of outdoor
fan motor faulty.

-Windings of outdoor fan
are shorted.

- Repair refrigeration system
and charge refrigerant if
necessary.

-Replace P.C.B.

- Outdoor fan blocked
remove obstructions.

- Remove obstructions.

- Replace capacitor.

-Replace motor.

SM LEXDCI 1-E.1 GB

13-5

TROUBLESHOOTING

CONTENTS

No. Fault Probable Cause Corrective Action

- Overload safety device

20

No cooling or
heating takes
place, indoor
and outdoor fans
working.

on compressor is cut
out (low voltage or high
temperature)

- Compressor run
capacitor faulty.

- Check for proper voltage,
switch off power and try
again after one hour.

- Replace compressor
capacitor.

21

22

23

24

No air supply
at indoor unit,
compressor
operates.

Partial, limited air
supply at indoor
indoor unit.

Water accumulates
and overflow from
indoor unit section.

Water dripping
from outdoor unit
base. (in heating
mode)

- Compressor windings
are shorted.

-Indoor fan motor is
blocked or turns slowly.

-indoor fan run capacitor
faulty.

- motor windings are
shorted.

Lack of refrigerant
(will accompanied by
whisteling noise) cause ice
formation on indoor unit
coil in cooling mode.

Drain tube or spout of
drain pan clogged.

Water drain outlet is
clogged.

- Replace compressor.

- Check voltage,repair wiring
if necessary.

-Check fan wheel if it is
tight enough on motor
shaft,tighten if necessary.

-Replace indoor fan motor.

-Charge the unit after
localizing leak.

-Disasemble plastic drain
tube from spout of indoor unit
drain pan.

-Open outdoor unit cover
clean out water outlet ,clean
the base inside througly.

25

13-6

Freeze-up of
outdoor coil in
heating mode, poor
heating effect in
room, indoor fan
operates.

-Faulty outdoor thermistor.

-Faulty control cable.

- Outdoor temperature is
too low (below -2°C)

-Outdoor unit air outlet is
blocked.

-Replace thermistor.

- Repair control cable.

- Shut unit off, outdoor temp.
is below design conditions
and cannot function properly.

-Remove obstructions.

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TROUBLESHOOTING

CONTENTS

13.1.5 Outdoor Unit Diagnosits

No Problem 5 4 3 2 1

1 OCT is disconnected 0 0 0 0 1
2 OCT is shorted 0 0 0 1 0
3 CTT is disconnected 0 0 0 1 1
4 CTT is shorted 0 0 1 0 0
5 HST is disconnected (when enabled) 0 0 1 0 1
6 HST is shorted (when enabled) 0 0 1 1 0
7 OAT is disconnected (when enabled) 0 0 1 1 1
8 OAT is shorted (when enabled) 0 1 0 0 0

9 TSUC is disconnected (when enabled) 0 1 0 0 1
10 TSUC is shorted (when enabled) 0 1 0 1 0
11 IPM Fault 0 1 0 1 1
12 Bad EEPROM 0 1 1 0 0
13 DC under voltage 0 1 1 0 1
14 DC over voltage 0 1 1 1 0
15 AC under voltage 0 1 1 1 1
16 Indoor / Outdoor unit Communication mismatch 1 0 0 0 0
17 No Communication 1 0 0 0 1
18 Reserved 1 0 0 1 0
20 Heat sink Over Heating 1 0 1 0 0
21 Deicing 1 0 1 0 1
22 Compressor Over Heating 1 0 1 1 0
23 Compressor Over Current 1 0 1 1 1
24 No OFAN Feedback 1 1 0 0 0
25 OFAN locked 1 1 0 0 1
26 Compressor Lock 1 1 0 1 0
27 Bad Communication 1 1 0 1 1

13.1.5.1 Outdoor Unit Diagnostics and Corrective Actions

No Fault Probable Cause Corrective Action

Sensors failures of all

1

types

2 IPM Fault

3 Bad EEPROM

4 DC under/over Voltage

5 AC under Voltage

Indoor / Outdoor unit

6

Communication mis­match

7 No Communication

8 Compressor Lock

9 Bad Communication

Electronics HW prob­lem

Electronics HW prob­lem

Indoor and Outdoor
controllers are with
different versions

Communication or
grounding wiring is not
good.

Communication quality is
low reliability

Check sensors connec­tions or replace sensors.
Check all wiring and
jumper settings, if OK,
replace electronics.

No action, unless special
parameters are required
for unit operation.
Check outdoor unit pow­er supply voltage
Check outdoor unit pow­er supply voltage

Replace Indoor controller

Check Indoor to Outdoor
wiring and grounding

Switch unit to STBY and
restart
Check Indoor to Outdoor
wiring and grounding

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CONTENTS

13.1.6 Judgment by MegaTool

MegaTool is a special tool to monitor the system states.
Using MegaTool requires:
A computer with RS232C port.
A connection wire for MegaTool.
A special MegaTool software.
Use MegaTool according to following procedure:
Setup MegaTool software: copy the software to the computer.
Connect RS232C port in computer with MegaTool port in Indoor/Outdoor unit controller by the
connection wire.
Run the software and choose the COM port, you can monitor the A/C system state
In monitor tab

13.1.7 Simple procedures for checking the Main Parts

13.1.7.1 Checking Mains Voltage.

Confirm that the Mains voltage is between 198 and 264 VAC. If Mains voltage is out of this range,
abnormal operation of the system is expected. If in range check the Power (Circuit) Breaker and look
for broken or loosed cable lugs or wiring mistake(s).

13.1.7.2 Checking Power Input.

If Indoor unit power LED is unlighted, power down the system and check the fuse of the Indoor unit.
If the fuse is OK replace the Indoor unit controller. If the fuse has blown, replace the fuse and power
up again.
Checking Power Input procedure for the Outdoor unit is the same as with the Indoor unit.

13.1.7.3 Checking the Outdoor Fan Motor.

Enter Test Mode (where the OFAN speed is high)
Check the voltage between lead wires according to the normal value as following:
Between red wire and black wire: 310VDC +/- 20V
Between orange wire and black wire: 15VDC +/- 1V
Between yellow wire and black wire: 2-6VDC

13.1.7.4 Checking the Compressor.

The compressor is brushless permanence magnetic DC motor. Three coil resistance is same. Check
the resistance between three poles. The normal value should be below 0.5 ohm (TBD).

13.1.7.5 Checking the Reverse Valve (RV).

Running in heating mode, check the voltage between two pins of reverse valve connector, normal
voltage is 220VAC.

13.1.7.6 Checking the electrical expansion valve (EEV).

The EEV has two parts, drive part and valve. The drive part is a step motor; it is ringed on the valve.
Check the drive voltage (12VDC). When Outdoor unit is power on, EEV shall run and have click and
vibration.

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CONTENTS

13.1.8 Precaution, Advise and Notice Items

13.1.8.1 High voltage in Outdoor unit controller.

Whole controller, including the wires that are connected to the Outdoor unit controller may have
the potential hazard voltage when power is on. Touching the Outdoor unit controller may cause an
electrical shock.
Advise: Don’t touch the naked lead wire and don’t insert finger, conductor or anything else into the
controller when power is on.

13.1.9 Charged Capacitors

Three large-capacity electrolytic capacitors are used in the Outdoor unit controller. Therefore, charging
voltage (380VDC) remains after power down. Discharging takes about four minutes after power is
off. Touching the Outdoor unit controller before discharging may cause an electrical shock.

13.1.10 Additional advises

When disassemble the controller or the front panel, turn off the power supply.
When connecting or disconnecting the connectors on the PCB, hold the whole housing, don’t pull
the wire.
There are sharp fringes and sting on shell. Use gloves when disassemble the A/C units.

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13.2 Troubleshooting for DCI 72 / 80

WARNING!!!

When Power Up – the whole outdoor unit controller, including the wiring, is under

HIGH VOLTAGE!!!

Never open the Outdoor unit before turning off the Power!!!

When turned off, the system is still charged (400V)!!!

It takes about 1 Min. to discharge the system.

Touching the controller before discharging may cause an electrical shock!!!

13.2.1 General System Failures and Corrective Actions

No Symptom Probable Cause Corrective Action

Check power supply. If OK,

Indoor unit power supply indicator

1

(Red LED) does not light up.

No power supply

check display and display
wiring. if OK, replace
controller

Indoor unit does not respond to

2

remote control message

Indoor unit responds to remote
control message but Operate

3

indicator (Green LED) does not
light up

Indoor fan does not start (louvers
are opened and Green LED is

4

ON)

Remote control
message not reached
the indoor unit

Problem with display
PCB

Unit in heat mode and
coil is still not warm

Outdoor unit is in
opposite mode

Problem with controller
or capacitor

Check remote control
batteries, if OK, check
display and display wiring,
if OK, replace display
PCB. If still not OK replace
controller

Replace display PCB.
If still not OK replace
controller

Change to cool mode

Change operation mode

Change to high speed
and Check power supply
to motor is higher than
130VAC (for triack
controlled motor) or higher
than 220VAC for fixed
speed motors, if OK replace
capacitor, if not OK replace
controller

5

6

13-10

Indoor fan works when unit is
OFF, and indoor fan speed is
not changed by remote control
command.

Water leakage from indoor unit

Controller problem Replace controller

Indoor unit drainage
tube is blocked

Check and open drainage
tube

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No Symptom Probable Cause Corrective Action

Check the connections

Outdoor unit display board and

7

leds are off

Compressor operates but no

8

capacity

Compressor is over heated and

9

unit does not generate capacity

No power supply

PFC Chock coil Check the PFC Chock coil

Burnt fuse Check 20A fuse on the Filter

EEV problem Check EEV
Refrigerant leakage Check refrigeration system

Indoor coil block

Outdoor coil block

EEV problem Check EEV
Refrigerant leakage Check refrigeration system)

Indoor coil block

Outdoor coil block

and the wiring on the main
terminal - Repair if needed.

Clean filters and/or remove
block

Remove block and/or avoid
air by-pass

Clean filters and/or remove
block

Remove block and/or avoid
air by-pass

Compressor stops during

10

operation

Unit is not operating

11

Compressor does not start

12

Unit works in wrong mode (cool
instead of heat or heat instead of

13

cool)
All components are operating

properly but no cooling or no

14

heating
Compressor motor is generating

15

noise and no suction occurs
Freezing of outdoor unit in heat

mode and outdoor unit base is

16

blocked with ice
The unit stop suddenly during

17

operation

Indoor unit(s) Indicator(s) leds

18

may flicker

Electronic control Check diagnostics

Refrigerant leakage Check refrigeration system

Communication
problems

Electronics control
problem or protection

Electronics or RV
problem

Refrigerant leak Check refrigeration system

Phase order to
compressor is wrong

EMC interference to the
A/C unit

Check diagnostics

Check RV

Check compressor phase
order

Connect base heater

Check for EMC problems

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No Symptom Probable Cause Corrective Action

Other home appliances operation
is faulty such as noise appears
in the television picture, or the

21

picture is distorted or static occurs
in the radio sound

EMC interference by
the A/C unit

Check for EMC problems

22

All others

Specific problems of
indoor or outdoor units

Check diagnostics

13.2.2 Checking the refrigeration system

Checking system pressures and other thermodynamic measures should be done when system is
in technician Mode where the system operates as in fixed settings. The performance curves given
in this manual are given for unit performance in Technician mode when high indoor fan speed is
selected.

13.2.3 Diagnostics

13.2.3.1 Outdoor unit diagnostics

If any fault exists in the system, it will be shown according to tIf no fault exists in the system, no
fault code will be displayed during normal operation mode, and the status led will be on while the
compressor is enable.he following coding method.
Two LEDs display the system diagnostics on real time as follows:
STATUS LED is blinking 5 times in 5 seconds, and shut off for the next 5 seconds.
FAULT LED will blink during the same 5 seconds according to the following table:

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No Problem 54321

1OCT bad 00001
2CTT bad 00010
3HST bad 00011
4OAT bad 00100
5OMT bad 00101
6RGT bad 00110
7 OFAN/Compressor Feedback Loss 00111
8 OFAN- IPM fault 01000

9 OFAN Lock 01001
10 OFAN- Vospd exceeded 01010
11 Compressor- IPM Fault 01011
12 Compressor Lock 01100
13 Compressor- Vospd exceeded 01101
14 Compressor- Foldback 01110
15 DC under voltage 01111
16 DC over voltage 10000
17 AC under voltage 10001
18 No communication A 10010
19 reserved 10011
20 reserved 10100
21 reserved 10101
22 Compressor- Ilegal Speed 10110
23 System Configuration Changed 10111
24 System Configuration Problem 11000
25 Heat sink Over Heating Fault/Protection 11001
26 Deicing Protection 11010
27 Compressor Over Heating Protection 11011
28 System over power Protection 11100
29 Bad EEPROM 11101
30 Not Configured 11110
31 Bad Communication 11111

Notes:
1 - ON, 0 - OFF

Whenever this table is updated, the installation test procedure, and the alarm output function should
be updated.
Only one code is shown.
Order of priority is 1-32. Diagnostics is continuously ON as long as power is on.
Heat Sink Over Heating Protection, Compressor Over Heating Protection, and System Over Power
Protection are declared only whenever in ‘Stop-Compressor’ status.
All faults, except the thermistor faults, will remain at least 10 seconds. This rule comes to serve the
monitoring utilities, in a case the fault is released quickly it will be still shown under the monitoring
utilities.
Thermistor faults are reported only when they are enabled.
When the outdoor unit is in fault (not protection), an in-fault signal is sent to the indoor. When all the
outdoor unit faults are cleared, ‘no-fault’ signal is sent to the indoor.

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13.2.3.2 Outdoor fault corrective actions

No Fault Name Probable Cause Corrective Action

1 OCT bad
2 CTT bad
3 HST bad
4 OAT bad
5 TSUC bad
6 RGT bad

Thermistor not connected or
damaged

Check Thermistor

OFAN/Compressor

7

Feedback Loss

8 OFAN - IPM fault

9 OFAN Lock Fan does not rotate Check OFAN motor

OFAN- Vospd

10

exceeded

Compressor- IPM

11

Fault

12 Compressor Lock Compressor does not rotate Check Compressor

Compressor- Vospd

13

exceeded

OFAN halls or wires bad.
Compressor wire cable bad or
IPM bad or compressor bad

Over current / Over temperature
of OFAN IPM

Exceeds speed high limit

Over current / Over temperature
of compressor IPM

Exceeds speed limit

Check OFAN motor and
compressor

Check no obstruction to
controller air opening
Check OFAN motor
Check motor type matches
motor jumpers in controller

Check motor type matches
motor jumpers in controller
Make necessary arrengments
in unit installation location to
avoid back wind
Avoid EMC problems

Check no obstruction to
controller air opening
Check Compressor

Try again and replace controller
if still have the problem

Compressor-

14

Foldback

15 DC under voltage DC voltage is lower than limit Replace controller

16 DC over voltage

17 AC under voltage

13-14

High pressure / Current reduces
compressor speed

DC voltage exceeds its high
limit

AC input voltage is lower than
limit

Check Compressor

Check if input voltage higher
than limit (270VAC), if not
and the problem presist,
replace controller. If voltage is
high, shut off the power and
recommend the customer to fix
the power supply

Check if input voltage lower
than limit (170VAC), if not and
the problem presist, replace
controller. If voltage is low,
recommend the customer to fix
the power supply

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No Fault Name Probable Cause Corrective Action

18 No communication A No signals in line A Check communication

Compressor- Ilegal

19

Speed

Exceeds speed low limit See # 13

System Configuration

20

Changed

System Configuration

21

Problem

Heat sink Over

22

Heating Fault/
Protection

23 Deicing Protection During deicing procedure No action required

Compressor Over

24

Heating Protection

System over power

25

Protection

26 Bad EEPROM EEPROM not operating

Communication lines changed
from last operation

Miss-match between the IDUs
connected to port A,B,C or D,
or the total capacity code of
IDUs is higher than the ODU
maximum capacity code

Compressor stopped due to
heatsink protection

Compressor stopped due to
over heat protection

Compressor stopped due to
over power protection

No problem just an
announcement

Change configuration if
needed.

Check that the airflow around
the ODU is free and the fan is
running free. Check fan motor
(0)

Check if gas is missing in the
system

No action required

Power reset. (Replace
Controller just in case you need
EEPROM).

27 Not Configured Cannot start the control

28 Bad Communication Bad communication lines See # 18-21

Power reset. Replace
Controller if didn’t help

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13.2.4 Fault Code for Indoor unit

Pressing Mode button for long will activate diagnostic mode by the acknowledgment of 3 short beeps
and lighting of COOL and HEAT LED’s.
Entering diagnostics in STBY mode allows only viewing of status (fault-display).
In diagnostic mode, system problems / information will be indicated by blinking of Heat & Cool
LED’s.
The coding method will be as follows:
Heat led will blink 5 times in 5 seconds, and then will be shut off for the next 5 seconds. Cool Led will
blink during the same 5 seconds according to the following table:

No Fault Name 54321

1 RT-1 is disconnected 00001
2 RT-1 is shorted 00010
3 RT-2 is disconnected 00011
4 RT-2 is shorted 00100

… Reserved 00101

7 Communication mismatch 00111
8 No Communication 01000

9 No Encoder 01001
10 Reserved 01010
11 Outdoor Unit Fault 01011

… Reserved
17 Defrost protection 10001
18 Deicing Protection 10010
19 Outdoor Unit Protection 10011
20 Indoor Coil HP Protection 10100

21 Overflow Protection 10101

… Reserved
24 EEPROM Not Updated 11000
25 Bad EEPROM 11001
26 Bad Communication 11010
27 Using EEPROM data 11011
28 Model A 11100
29 Model B 11101
30 Model C 11110

31 Model D 11111

1 - ON, 0 - OFF
Only one code is shown. Order of priority is lower to the higher number. Diagnostics is continuously
ON as long power is on.

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13.2.4.1 Indoor unit diagnostics and corrective actions

CONTENTS

TROUBLESHOOTING

No.

1-4 Sensor failures

Communication

7

mismatch

8 No Communication

9 No Encoder Indoor electronics or motor

11 Outdoor Unit Fault Outdoor controller problem

17-21 Protections Indication No action

24

25 Bad EEPROM

EEPROM Not
Updated

Fault Probable Cause Corrective Action

Sensors not connected or
damaged

Indoor and Outdoor controllers
are with different versions

Communication or grounding
wiring is not good

System is using ROM
parameters and not EEPROM
parameters

Check sensor connections
or replace sensor

Replace Indoor controller

Check Indoor to Outdoor
wiring and grounding

Check motor wiring, if ok,
replace motor, if still not ok,
replace Indoor controller.

Switch to Outdoor
diagnostics.

No action, unless special
parameters are required for
unit operation.

No action, unless special
parameters are required for
unit operation.

26 Bad Communication

27 Using EEPROM data No problem

28-31 IDU model

Communication quality is low
reliability

Check Indoor to Outdoor
wiring and grounding

13.2.5 Procedures for checking Main Parts

13.2.5.1 Checking Mains Voltage

Confirm that the Mains voltage is between 198 and 264 VAC. If Mains voltage is out of this range,
abnormal operation of the system is expected. If in range check the Power (Circuit) Breaker and look
for broken or loosed cable lugs or wiring mistake(s).

13.2.5.2 Checking Main fuse

Check 20A fuse on the Filter Board - If burnt – check the compressor, fan or any other peripheral that
can cause a short. In case of a problematic peripheral - replace it.
In case no problematic peripheral, check the resistance on the DC bank (B+ & B- on the Power
board), if it is less than 30Ω, replace the controller. Otherwise replace the burnt fuse. In case of
frequent burning fuse, replace the controller.

13.2.5.3 Checking PFC Chock coil

Check PFC chock connection – repair if needed.
Dis-connect the chock from the controller wire extensions, check if the 2 wires of the chock are
shorted. If shorted (OK) check between each wire and the metal box. If shorted replace chock, if
not (OK), open the controller top cover and check if the wire extensions are connected well and if
shorted. If not shorted, replace wires, if shorted (OK) than might be a controller problem – replace
controller.

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