Electra DELTA 22, DUO 38 DCI, DELTA 25, DELTA 35 Service Manual

DUO 38 DCI / DELTA

CONTENT

Indoor Units Outdoor Units

DELTA 22
DELTA 25
DELTA 35

DUO 38 DCI

SM DUO38 1-E.1 GB

REFRIGERANT

R410A

SEPTEMBER – 2008

HEAT PUMP

LIST OF EFFECTIVE PAGES

CONTENT

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 ........ January 2006

Total number of pages in this publication is 56 consisting of the following:

Page
No.

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

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

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

1-1 ........................ 1

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

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

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

5-1 - 5-9 ................ 1

6-1 - 6-2 ................ 1

7-1 ........................ 1

8-1 ........................ 1

9-1 - 9-2 ................ 1

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

11-1-11-18 ............. 1

12-1-12-6 .............. 1

13-1-13-2 .............. 1

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

Revision
No. #

Page
No.

• Zero in this column indicates an original page.

Revision
No. #

Page
No.

Revision
No. #

*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 DUO38 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 .......................................................................................5-1

6. PRESSURE CURVES ...........................................................................................6-1

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

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

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

10. TUBING CONNECTIONS ......................................................................................10-1

11. CONTROL SYSTEM .............................................................................................11-1

12. TROUBLESHOOTING ..........................................................................................12-1

13. EXPLODED VIEWS AND SPARE PARTS LISTS .................................................13-1

14. APPENDIX A .........................................................................................................14-1

SM DUO38 1-E.1 GB

i

1. INTRODUCTION

CONTENT

1.1 General

The new DUO 3.8 DCI Outdoor Unit is a high efficiency multi split inverter unit,
supporting Indoor Units capacity range of - 2.2, 2.5 and 3.5 Kw.

1.2 Main Features

• DC Inverter

• R410A

• High COP (A class energy rating)

• Pre-Charged

• Base heater connection.

• Cooling operation at outdoor temperature down to -100C.

• Heating operation at outdoor temperature down to -150C.

• 10 LED’s, shows both indoor and outdoor diagnostics.

• Variable Speed DC Inverter outdoor fan.

• M2L diagnostics softwear cable Port ( for PC).

• Low noise level

INTRODUCTION

1.3 Tubing Connections

Flare type interconnecting tubing to be produced on site.
For further details please refer to APPENDIX A on this manual, and to the relevant indoor
service Manual,

1.4 Inbox Documentation

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

1.5 Matching Table

1.5.1 R410A

OUTDOOR UNITS

MODEL REFRIGERANT DELTA 22 DCI DELTA 25 DCI DELTA 35 DCI

INDOOR UNITS

SM DUO38 1-E.1 GB

DUO 38 DCI R410A

√√√

1-1

PRODUCT DATA SHEET

CONTENT

2. PRODUCT DATA SHEET

2.1 Outdoor Unit DUO 38 DCI / Delta Specifications.

Model Indoor Unit DELTA 22 25 35
Model Outdoor Unit DCI DUO Delta 38 R410A

Installation Method of Pipe Flared

Characteristics Units Cooling Heating

(4)

Capacity

Power input

EER (Cooling) or COP(Heating)

Energy efficiency class A A

Power supply V/Ph/Hz 220-240V/Single/50Hz

Rated current A 4.8 5.4

Starting current A 10.5

Circuit breaker rating A 15

OUTDOOR

)

(4)

(4)

Refrigerant control EEV

Compressor type,model

Fan type & quantity Propeller(direct) x 1

Fan speeds H/L RPM 920/500

Air flow H/L m3/hr 2160

Sound power level H/L dB(A) 62 63
Sound pressure

(3)

level
Dimensions WxHxD mm 795*290*610

Weight kg 38

Package dimensions WxHxD mm 945*395*655

Packaged weight kg 40

Units per pallet Units 9 units per pallet

Stacking height units 3 levels

Refrigerant type R410A

Refrigerant chargless distance kg/m 1.2/7.5

Additional charge per 1 meter g/m No need

Liquid line In.(mm) 1/4"(6.35)

Connections

between units

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

Max.tubing length m. Max.30

H/L dB(A) 52 53

Btu/hr 13300(4090-18750) 15350(4090-21140)

kW 3.90(1.50-5.50) 4.50(1.20-6.20)

kW 1.1(0.45-1.80) 1.24(0.45-1.80)

W/W 3.55 3.61

Single Rotary DC Inverter,Panasonic

5RS102XAB

Operation control type Remote control

Heating elements kW

Others

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

SM DUO38 1-E.1 GB

Max.height difference m. Max. 10

2-1

PRODUCT DATA SHEET

CONTENT

2.2 Indoor Units Data

2.2.1 DELTA 22 DCI Specifications

Model Indoor Unit / Type DELTA 22 DCI / Wall Mounted

Installation Method FLARE
Power Supply V/Ph/Hz 220-240 / 1/ 50

Fan Type & Quantity Crossflow *1

Airflow
Cooling / Heating

Sound Power Level
Cooling / Heating
Sound Pressure Level
Cooling / Heating

INDOOR

Condensate Drain Tube I.D. mm 16
Dimensions W/H/D mm 680 250 185
Weight kg 7
Package Dimensions W/H/D mm 740 320 265
Stacking Height Units 9 LEVELS

Heating Elements kW N/A
Moisture Removal L/hr 1

(2)

H/M/L m3/hr 400 350 300

(3)

L - H dB (A) 49/46/43

(4)

L - H dB (A) 36/33/30

2.2.2 DELTA 25 DCI Specifications

Model Indoor Unit / Type DELTA 25 DCI / Wall Mounted

Installation Method FLARE
Power Supply V/Ph/Hz 220-240 / 1/ 50

Fan Type & Quantity Crossflow *1
Airflow

Cooling / Heating
Sound Power Level

Cooling / Heating
Sound Pressure Level

Cooling / Heating

INDOOR

Condensate Drain Tube I.D. mm 16
Dimensions W/H/D mm 680 250 185

Weight kg 7
Package Dimensions W/H/D mm 740 320 260

Stacking Height Units 9 LEVELS
Heating Elements kW N/A
Moisture Removal L/hr 1.0

(1) Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units) and EN14511.
(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)

H/M/L m

(3)

3

/hr 420 350 270

L - H dB (A) 52/48/45

(4)

L - H dB (A) 39/35/32

2-2

SM DUO38 1-E.1 GB

PRODUCT DATA SHEET

CONTENT

2.2.3 DELTA 35 DCI Specifications

Model Indoor Unit / Type DELTA 35 DCI / Wall Mounted

Installation Method FLARE

Power Supply V/Ph/Hz 220-240 / 1/ 50

Fan Type & Quantity Crossflow *1

Airflow

Cooling / Heating

Sound Power Level

Cooling / Heating

Sound Pressure Level

Cooling / Heating

INDOOR

Condensate Drain Tube I.D. mm 16

Dimensions W/H/D mm 840 250 185

Weight kg 8.0

Package Dimensions W/H/D mm 930 320 265

Stacking Height Units 9 LEVELS

Heating Elements kW N/A

Moisture Removal L/hr 1.5

(2)

H/M/L m3/hr 550 450 350

(3)

L - H dB (A) 56/46/42

(4)

L - H dB (A) 39/33/29

(1) Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units) and EN14511.
(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.

2.3 Indoor Units Combinations

Cooling Heating

Indoor Units

Combinations

22 2200

25 2500

35 3500

22+22 1850 1850

22+25 1850 1950

22+35 1850 3050

25+25 1950 1950

Room A Room B Total Capacity Power Input Room A Room B Total Capacity Power Input

[W] [W] [W] [W] [W] [W] [W] [W]

-

2200 (1500 - 2600) 675 (450 - 850) 2500

-

2500 (1500 - 3000) 750 (450 - 980) 2800

-

3500 (1500 - 4100) 1030 (450 – 1250) 3600

3700 (1500 - 4700) 1000 (450-1800) 2150 2150 4300 (1200 – 5200) 1200 (450 – 1800)

3800 (1500 - 4800) 1050 (450 - 1800) 2150 2250 4400 (1200 – 5300) 1240 (450 – 1800)

4900 (1500 - 5200) 1350 (450 - 1800) 2150 3250 5400 (1200 – 5900) 1520 (450 – 1800)

3900 (1500 - 5500) 1100 (450 - 1800) 2250 2250 4500 (1200 - 6200) 1280 (450 - 1800)

-

2500 (1200 - 3100) 750 (450 - 1000)

-

2800 (1200 – 3500) 910 (450 – 1220)

-

3600 (1200 - 4100) 1030 (450 - 1150)

SM DUO38 1-E.1 GB

25+35 1950 3050

5000 (1500 - 5500) 1400 (450 - 1800) 2250 3250 5500 (1200 - 6200) 1560 (450 - 1800)

2-3

3. RATING CONDITIONS

CONTENT

Standard conditions in accordance with ISO 5151, ISO 13253 (for ducted units)
and EN 14511.

Cooling:

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

Heating:

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

3.1 Operating Limits

Upper limit

Cooling

Lower limit 21

Upper limit 27

Heating

Lower limit 10

RATING CONDITIONS

Indoor Outdoor

o

C DB 23oC WB 46oC DB

32

o

C DB 15oC WB -10oC DB

o

C DB 24oC DB 18oC WB

o

C DB -15oC DB -16oC WB

Voltage

1PH 198 – 264 V

3PH N/A

SM DUO38 1-E.1 GB

3-1

4. OUTLINE DIMENSIONS

µ

CONTENT

4.1 Indoor Unit: DELTA 22, DELTA 25 DCI

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

141

58

306

OUTLINE DIMENSIONS

CEILING

INDOOR UNIT OUTLINE

46

Min50

AIR INTAKE

AIR INTAKE

AIR OUTLET

Indoor Unit: DELTA 35 DCI

4.2

185

250

160

41

ŘŞř

52

118

TUBING WALL OPENING
(FOR REAR LEFT ROUTING)

Şŗ

40

´¶¼µ»°µ®»¬´·³¨»¬
»¶©¬¼º¬«¶¹³¶ª¨»°¶µ
¶°µ«¶¶¹¼µ°»¶µ»¯¬¾¨³³

380

670

TUBING WALL OPENING

(FOR REAR ROUTING)

680

śŗŝ

ª¬°³°µ®

ŜŠ

244

80

ŗŜòí´

°µ«¶¶¹¼µ°»¶¼»³°

¨°¹°µ»¨²¬

¨°¹°µ»¨²¬

¨°¹¶¼»³¬»

SM DUO38 1-E.1 GB

ŘşŜ

ŗŝ
Ř

ŗś

Ŝŗ

ŘŚŞ

ŗŜ
ř

řŜ

»¼©°µ®¾¨³³¶·¬µ°µ®
¶¹¹¬¨¹³¬»¹¶¼»°µ®

Ŝŗś

şŚŗ

»¼©°µ®¾¨³³¶·¬µ°µ®

¶¹¹¬¨¹¹¶¼»°µ®

şśŗ

śśř

şŗ

4-1

OUTLINE DIMENSIONS

CONTENT

4.3 Outdoor Unit: DUO 38 DCI / Delta

4-2

SM DUO38 1-E.1 GB

5. PERFORMANCE DATA

n

CONTENT

5.1 Delta 22+22 DCI

5.1.1 Cooling Capacity (kW) - Run Mode (Unit A or B)

230[V] : Indoor Fan at High Speed.

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

PERFORMANCE DATA

OD COIL ENTERING AIR
DB TEMPERATURE [0C]

-10 - 20 (protection range)

25

30

35

40

46

LEGEND

DATA 22/15

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

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

PI 25 - 50 % of nominal
TC 1.98 2.10 2.22 2.33 2.45
SC 1.53 1.57 1.61 1.64 1.68

PI 0.39 0.40 0.41 0.42 0.43
TC 1.80 1.92 2.03 2.15 2.26
SC 1.46 1.49 1.53 1.56 1.60

PI 0.44 0.45
TC 1.62 1.73

0.45

1.85

0.46 0.47

1.97 2.08

SC 1.38 1.41 1.45 1.49 1.52

PI 0.48 0.49
TC

80%-92% of nominal

0.50

0.51 0.52

SC 80%-92% of nominal

PI 80%-100% of nominal
TC 70%-85% of nominal
SC 70%-85% of nominal

PI 90%-100% of nominal

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

o

DB – Dry Bulb Temp., (

C)
ID – Indoor
OD – 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 Temperature [deg C]

SM DUO38 1-E.1 GB

5-1

PERFORMANCE DATA

CONTENT

5.1.3 Heating Capacity (kW) - Run Mode(Unit A or B)

230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB TEMPERATURE [C0]

OD COIL ENTERING AIR

DB/WB TEMPERATURE

[C0]

-15/-16

-10/-12

-7/-8

-1/-2

2/1

7/6

10/9

15/12

15-24 TC 85 - 105 % of nominal

(Protection Range) PI 80 - 120 % of nominal

DATA 15 20 25

TC 1.15 1.07 1.00

PI 0.38 0.44 0.49

TC 1.37 1.30 1.23

PI 0.44 0.50 0.55

TC 1.54 1.47 0.55

PI 0.49 0.54 0.60

TC 1.63 1.56 1.49

PI 0.51 0.56 0.62

TC 1.68 1.61 1.54

PI 0.52 0.58 0.63

TC 2.22 2.15 2.08

PI 0.54 0.60 0.66

TC 2.31 2.24 2.17

PI 0.57 0.63 0.68

TC 2.40 2.33 2.26

PI 0.60 0.65 0.71

LEGEND

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

5.1.4 Capacity Correction Factors

1.2

1.1

1

0.9

0.8

0.7

Capacity Ration

0.6

0.5

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [deg C]

5-2

SM DUO38 1-E.1 GB

5.2 Delta 25+25 DCI

CONTENT

5.2.1 Cooling Capacity (kW) - Run Mode (Unit A or B)

230[V] : Indoor Fan at High Speed.

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

OD COIL ENTERING

AIRDB TEMPERATURE

[oC]

-10 - 20 (protection range)

25

30

35

40 (protection range

46 (protection range

DATA 22/15

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

PI 25 - 50 % of nominal
TC 2.09 2.21 2.34 2.46 2.58
SC 1.64 1.68 1.72 1.76 1.80

PI 0.43 0.44 0.45 0.46 0.47
TC 1.90 2.02 2.14 2.27 2.39
SC 1.56 1.59 1.63 1.67 1.71

PI 0.48 0.49
TC 1.71 1.83
SC 1.47 1.51 1.55 1.59 1.63

PI 0.53 0.54
TC
SC 80%-92% of nominal

PI 80%-100% of nominal
TC 70%-85% of nominal
SC 70%-85% of nominal

PI 90%-100% of nominal

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

80%-92% of nominal

0.50

1.95

0.55

PERFORMANCE DATA

0.51 0.52

2.07 2.19

0.56 0.57

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

5.2.2 Capacity Correction Factors

Cooling Capacity Ratio Vs. Outdoor Temperature

1.2

1.1

1

0.9

0.8

0.7

Capacity Ration

0.6

0.5

20 25 30 35 40 45

Outdoor Temperature [deg C]

SM DUO38 1-E.1 GB

5-3

PERFORMANCE DATA

CONTENT

5.2.3 Heating Capacity (kW) - Run Mode(Unit A or B)

230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB TEMPERATURE [0C]

OD COIL ENTERING

AIR DB/WB

TEMPERATURE [0C]

DATA 15 20 25

-15/-16

-10/-12

-7/-8

-1/-2

2/1

7/6

10/9

15/12

15-24

(Protection Range)

TC 1.20 1.12 1.05

PI 0.41 0.47 0.53

TC 1.44 1.36 1.29

PI 0.47 0.53 0.59

TC 1.61 1.54 1.47

PI 0.52 0.58 0.64

TC 1.70 1.63 1.55

PI 0.54 0.60 0.66

TC 1.76 1.69 1.61

PI 0.56

TC 2.32

PI 0.58

TC 2.42

PI 0.61 0.67 0.73

TC 2.51 2.43 2.36

PI 0.64 0.69 0.75

TC 85 - 105 % of nominal

PI 80 - 120 % of nominal

LEGEND

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

0.62

2.25

0.64

2.34

0.68

2.18

0.70

2.27

1.3.4 Capacity Correction Factors

5-4

Heating Capacity Ratio Vs. Outdoor Temperature

1.2

1.1

1

0.9

0.8

0.7

Capacity Ration

0.6

0.5

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [deg C]

SM DUO38 1-E.1 GB

5.3 Delta 25+35

CONTENT

5.3.1 Cooling Capacity (kW) - Run Mode(Unit A or B)

230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB/WB TEMPERATURE [OC]

OD COIL

ENTERING AIR DB

TEMPERATURE [OC]

DATA 22/15

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

PERFORMANCE DATA

-10 - 20 (protection
range)

25

30

35

40

46

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

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

PI 25 - 50 % of nominal
TC 3.27 3.46 3.65 3.84 4.04
SC 2.22 2.27 2.33 2.38 2.43

PI 0.67 0.68 0.70 0.71 0.72
TC 2.97 3.16 3.35 3.54 3.73
SC 2.11 2.16 2.21 2.27 2.32

PI 0.75 0.76
TC 2.67 2.86

0.77

3.05

0.79 0.80

3.24 3.43

SC 1.99 2.05 2.10 2.15 2.21

PI 0.82 0.84
TC

80%-92% of nominal

0.85

0.86 0.88

SC 80%-92% of nominal

PI 80%-100% of nominal
TC 70%-85% of nominal
SC 70%-85% of nominal

PI 90%-100% of nominal

5.3.2 Capacity Correction Factors

SM DUO38 1-E.1 GB

Cooling Capacity Ratio Vs. Outdoor Temperature

1.2

1.1

1

0.9

0.8

0.7

Capacity Ration

0.6

0.5

20 25 30 35 40 45

Outdoor Temperature [deg C]

5-5

PERFORMANCE DATA

CONTENT

5.3.3 Heating Capacity (kW) - Run Mode(Unit A or B)
230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB TEMPERATURE [0C]

OD COIL ENTERING

AIR DB/WB

TEMPERATURE [0C]

DATA 15 20 25

-15/-16

-10/-12

-7/-8

-1/-2

2/1

7/6

10/9

15/12

15-24

(Protection Range)

TC 1.73 1.62 1.52

PI 0.59 0.67 0.76

TC 2.07 1.97 1.86

PI 0.68 0.76 0.85

TC 2.33 2.22 2.12

PI 0.75 0.83 0.91

TC 2.46 2.35 2.25

PI 0.78 0.86 0.95

TC 2.55 2.44 2.33

PI 0.80

TC 3.36

PI 0.84

TC 3.49

PI 0.87 0.96 1.04

TC 3.62 3.52 3.41

PI 0.91 1.00 1.08

TC 85 - 105 % of nominal

PI 80 - 120 % of nominal

LEGEND

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

0.89

3.25

0.92

3.38

0.97

3.14

1.00

3.28

5.3.4 Capacity Correction Factors

5-6

Cooling Capacity Ratio Vs. Outdoor Temperature

1.2

1.1

1

0.9

0.8

0.7

Capacity Ration

0.6

0.5

20 25 30 35 40 45

Outdoor Temperature [deg C]

SM DUO38 1-E.1 GB

PERFORMANCE DATA

CONTENT

5.4 Capacity Correction Factor Due to Tubing Length
(OneWay)

5.4.1 Delta 22 / 25 / 35 DCI

5.4.2 Cooling

Capacity Ratio VS.Tubing Length - Cooling

1.02

1.00

0.98

0.96

0.94

0.92

Capacity Ratio

0.90

0.88
4 6 8 1012141618202224262830

Tubing Length [m]

5.4.3 Heating

1.02

1.00

0.98

0.96

0.94

0.92

Capacity Ratio

0.90

0.88

Capacity Ratio VS. Tubing Length - Heating

4 6 8 1012141618202224262830

Tubing Length [m]

SM DUO38 1-E.1 GB

5-7

6. PRESSURE CURVES

CONTENT

6.1 Model: Delta 22+22, Delta 25+25 DUO 38 DCI

6.1.1 Cooling – Test Mode

Suction Pressure VS.Outdoor Temp'.

1400

PRESSURE CURVES

Suction Pressure [kPa]

Discharge Pressure [kPa]

1300

1200

1100

1000

900

800

700

10 15 20 25 30 35 40 45

Outdoor DB Temperature [ºC]

Discharge Pressure VS. Outdoor Temp'.

3750
3500
3250
3000
2750
2500
2250
2000
1750
1500

10 15 20 25 30 35 40 45

Outdoor DB Temperature [ºC]

Indoor DB/WB

Temp'.

22/15

24/17

27/19

29/21

32/23

Indoor DB/WB

Temp'.

22/15

24/17

27/19

29/21

32/23

SM DUO38 1-E.1 GB

6-1

PRESSURE CURVES

CONTENT

6.1.2 Heading – Test Mode

Suction Pressure VS.Outdoor Temp'.

1100

1000

900

800

700

600

500

Suction Pressure [kPa]

400

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [ºC]

Indoor DB

Temp'.

15

20

25

Discharge Pressure VS. Outdoor Temp'.

3250

3000

2750

2500

2250

2000

1750

Discharge Pressure [kPa]

1500

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [ºC]

Indoor DB

Temp'.

15

20

25

6-2

SM DUO38 1-E.1 GB

6.2 Model: Delta 25+35 DUO 38 DCI

CONTENT

6.2.1 Cooling – Test Mode

Suction Pressure VS.Outdoor Temp'.

1200

1100

PRESSURE CURVES

Indoor DB/WB

Temp'.

Suction Pressure [kPa]

Discharge Pressure [kPa]

1000

900

800

700

10 15 20 25 30 35 40 45

Outdoor DB Temperature [ºC]

Discharge Pressure VS. Outdoor Temp'.

4000
3750
3500
3250
3000
2750
2500
2250
2000
1750
1500

10 15 20 25 30 35 40 45

22/15

24/17

27/19

29/21

32/23

Indoor DB/WB

Temp'.

22/15

24/17

27/19

29/21

32/23

SM DUO38 1-E.1 GB

Outdoor DB Temperature [ºC]

6-3

PRESSURE CURVES

CONTENT

6.1.2 Heading – Test Mode

Suction Pressure VS.Outdoor Temp'.

1100

Suction Pressure [kPa]

1000

900

800

700

600

500

400

300

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [ºC]

Discharge Pressure VS. Outdoor Temp'.

Indoor DB

Temp'.

15

20

25

Discharge Pressure [kPa]

3250

3000

2750

2500

2250

2000

1750

1500

-15 -10 -5 0 5 10 15
Outdoor WB Temperature [ºC]

Indoor DB

Temp'.

15

20

25

6-4

SM DUO38 1-E.1 GB

ELECTRICAL DATA

CONTENT

7. ELECTRICAL DATA

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

Connected to Outdoor

Maximum Current 13.7 A

Inrush Current 35 A

Starting Current 10 A

Circuit breaker 16 A

Power supply wiring - No. x cross section 3 X 2.5 mm

Interconnecting cable - No. x cross section 2 X 4 X 1.5 mm

Note:

• Inrush current is the current when power is up. (charging the DC capacitors at outdoor unit
controller).

• Starting current is the current when starting the compressor

2

2

NOTE

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

7-1

8. WIRING DIAGRAMS

CONTENT

8.1 DUO 38 DCI / DELTA Wiring Diagram

WIRING DIAGRAMS

HSTSUCTCTT

Ferrite core

L

N

4/L

5/C

6

N

To metal sheet

L

Red

FUSE

Blue

T 15A/250Vac

Brown

Y/G

~230V 50Hz

Power supply

To metal sheet

Ferrite core

L

UNIT 1

N

4/L

65/C

UNIT 2

Blue

Red

Brown

Y/G

L1

N1

C1

C2

C1

C2

2
1

P5

22
11

P8

N1/2

L1/2

OATOCT

OFAN

OUTDOOR UNIT CIRCUIT DIAGRAM

Base

Choke coil

COMP

heater

valve

Reverse

PG

V

sp=0-6.5V DC

Vcc=15V DC
GND

V

m=310V DC

2
1

2
1

64
5

3
2
1

6
5
4
3
2
1

2

1

2
1

W

UV

P20

P19 P2EEV

P7

P15

P1

P4

P14

P13

P11P3 P9

P12

EARTH

To metal sheet

N-COM

COM

P10

N

L

Outdoor unit controller PCB

6

5

4

3

Model Jumper

2

1

JP9

J30

Mega tool

JP60

Jumper

J40

5

3

6

Night

4

J90

P2

P70

P10

P11

E

COM

NL

1

L

N

COM2

COM1

COM

321

2

Alarm

468600029

To metal sheet

E

N

COM

N-F

L-F

EEV1

2

3

1

4
3
2
1

4
3
2
1

RGT1

1

2

J50

6

4

5

RGT2

2

J51

EMI filter PCB

EEV2

2

4

13

J41

Stdby

MSMP PCB

2

1

1

J91

SM DUO38 1-E.1 GB

8-1

9. REFRIGERATION DIAGRAMS

CONTENT

9.1 Heat Pump Models

9.1.1 DUO 38 DCI => Cooling Mode

REFRIGERATION DIAGRAMS

IDU1

Brass Jointer

(3/8")

Gas Valve

(3/8")

Brass Jointer

(3/8")

Gas Valve

(3/8")

IDU2

Brass Jointer

(1/4")

Liquid Valve

(1/4")

Strainer

Brass Jointer

(1/4")

Liquid Valve

(1/4")

Strainer

SM DUO38 1-E.1 GB

ODU

Reverse

Valve

ID¦3.0ױ

ID¦3.0ױ

COMP.

EEV1

EEV2

Strainer

ID¦3.0ױ

9-1

REFRIGERATION DIAGRAMS

CONTENT

9.1.2 DUO 38 DCI => Heating Mode

IDU1

Brass Jointer

(3/8")

Gas Valve

(3/8")

Brass Jointer

(3/8")

Gas Valve

(3/8")

IDU2

Brass Jointer

(1/4")

Liquid Valve

(1/4")

Strainer

Brass Jointer

(1/4")

Liquid Valve

(1/4")

Strainer

9-2

ODU

Reverse

Valve

ID¦3.0ױ

ID¦3.0ױ

COMP.

EEV1

EEV2

Strainer

ID¦3.0ױ

SM DUO38 1-E.1 GB

10. TUBING CONNECTIONS

CONTENT

TUBING CONNECTIONS

TUBE (Inch)

¼” ⅜” ½” ⅝” ¾”

TORQUE (Nm)

Flare Nuts 11-13 40-45 60-65 70-75 80-85
Valve Cap 13-20 13-20 18-25 18-25 40-50

Service Port Cap 11-13 11-13 11-13 11-13 11-13

1. Valve Protection Cap-end

2. Refrigerant Valve Port (use Allen wrench to open/close)

3. Valve Protection Cap

4. Refrigerant Valve

5. Service Port Cap

6. Flare Nut

7. Unit Back Side

8. Copper Tube

When the outdoor unit is installed above the indoor unit an oil trap is required every 5m along the suction
line at the lowest point of the riser. Incase the indoor unit is installed above the outdoor, no trap is
required.

SM DUO38 1-E.1 GB

10-1

CONTROL SYSTEM

CONTENT

11. CONTROL SYSTEM

11.1 General Functions and Operating Rules (for single split
models)

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.

11.2 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 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.

11.3 Compressor Frequency Control

11.3.1 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

Max NLOADIF1C
Max NLOADIF2C
Max NLOADIF3C
Max NLOADIF4C
Max NLOADIF5C

127
127
127
127
127

SM DUO38 1-E.1 GB

Heat No limit Nominal Heating

11-1

CONTROL SYSTEM

CONTENT

11.3.2 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

Maximum frequency

10

0 Compressor is stopped

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

OAT Range Cool mode limits Heat mode limits

OAT < 6

6 ≤ OAT < 15

15 ≤ OAT < 24

24 ≤ OAT No limit

MaxFreqAsOATC

Minimum frequency

11.3.3 Frequency Changes Control

Frequency change rate is 1 Hz/sec.

11.3.4 Compressor Starting Control

Frequency

Step 3

No limit

MaxFreqAsOAT1H

MaxFreqAsOAT2H

Step 2

Step 1

1

Minute

1

Minute

Min 10 Minutes

\

11.3.5 Minimum On and Off Time 3 minutes

Time

11-2

SM DUO38 1-E.1 GB

11.4 Indoor Fan Control

CONTENT

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.

11.4.1 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.

11.5 Heating Element Control

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

11.6 Outdoor Fan Control

CONTROL SYSTEM

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, and outdoor air temperature (OAT) and heat sink
temperature (HST).

Routine Conditions

Heating with OAT < 150C

or

A

B Cooling with 200C > OAT > 70C
C Cooling with 7
D Heating with OAT > 15

Compressor Frequency (CF)

CF = 0 OFF OFF OFF OFF

10 ≤ CF < OFLowFreq

OFLowFreq ≤ CF < OFMedFreq

OFMedFreq ≤ CF

Cooling with OAT > 200C, or HST > 500C

or

Faulty OAT

0

C > OAT

0

C

Outdoor Fan Speed

Routine A Routine B Routine C Routine D

Low Low Very Low Low

Medium Low Very Low Low

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.

SM DUO38 1-E.1 GB

11-3

CONTROL SYSTEM

CONTENT

11.7 EEV (electronic Expansion valve) Control

EEV opening is defined as EEV = EEVOL + EEV

• 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 10 minutes of compressor operation EEVCV = 0.

• Once the first 10 minutes are over, the correction value is calculated as follow: EEVCV(n) =

EEVCV(n-1) + EEV

• EEV
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.

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

CTT

CTT

CV

11.8 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.

11.9 Ionizer Control

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

11.10 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.

11.11 Base Heater Control

When OAT is connected, Base Heater will be on when unit is in heating and OAT<20C.
When OAT is disconnected, Base Heater will be on when unit is in heating.

11.12 Fan Mode

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

11.13 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 Auto Fan user setting, fan speed will be adjusted automatically according to the
calculated NLOAD.

11-4

SM DUO38 1-E.1 GB

11.14 Heat Mode

CONTENT

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.

11.14.1 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

CONTROL SYSTEM

11.14.2 Indoor Fan Control in Heat Mode

Indoor fan speed depends on the indoor coil temperature:

ICTST

ICTVL ICTH ICTL

ICTT

11.15 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.

SM DUO38 1-E.1 GB

11-5

CONTROL SYSTEM

CONTENT

11.16 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.

11.17 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.

11.17.1 Indoor Coil Defrost Protection

ICT

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

8 ≤ ICT Normal

Fast

Increasing

Increasing No change Decreasing

ICT Trend

Fast

Decreasing

11.17.2 Indoor Coil over Heating Protection

ICT Trend

ICT

ICT > 55 SC SC SC SC SC
53 < ICT ≤ 55 D1 D1 D2 D2 D2
49 < ICT ≤ 53 SR SR D1 D2 D2
47 < ICT ≤ 49 SR SR SR D1 D2
45 < ICT ≤ 47 Norm Norm SR SR D1

43 < ICT ≤ 45 Norm Norm Norm SR SR

ICT ≤ 43 Normal

Fast

Decreasing

Decreasing No Change Increasing

Fast

Increasing

11-6

SM DUO38 1-E.1 GB

11.17.3 Compressor over Heating Protection

CONTENT

Compressor temperature can be in one of 5 control zones (4 in protection, and 1 normal), t.

CTT

Stop-Compresor

CTTOH4

CONTROL SYSTEM

CTTOH3

CTTOH2

CTTOH1

Control Status

P1 Norm SR
P2 D1 SR
P3 D2 D1

Stop Compressor SC

Compressor Temperature

P3

P2

P1

Normal

Increases

11.17.4 Compressor over Current Protection

CCR

Else

W

Stop-Compresor

CCROC4

HzDown2

CCROC3

HzDown1

CCROC2

Stop-Rise

CCROC1

Normal

SM DUO38 1-E.1 GB

11-7

CONTROL SYSTEM

CONTENT

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

HST

HST > 90 SC SC SC
85 < HST ≤ 90 D1 D2 D2
82 < HST ≤ 85 SR D1 D2
80 < HST ≤ 82 SR SR D1
78 < HST ≤ 80 Norm Norm SR

HST ≤ 78 Normal

Decreasing No Change Increasing

HST Trend

11.17.6 Outdoor Coil Deicing Protection

11.17.6.1 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 just switched to STBY AND OCT < 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.

11-8

SM DUO38 1-E.1 GB

11.17.6.2 Deicing Protection Procedure

CONTENT

OCT

12

0

hreshold

CONTROL SYSTEM

COMP

RV

OFAN

EEV

ON

HEAT

COOL

ON

OFF

EEVDeicerOpen

Any

T1 T2

max. 12 minutes

DT

T3 T3

T1 = T2 = 36 seconds, T3 = 6 seconds

11.17.7 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

11.17.7.1 Levels Logic (used in floor/ceiling models)

SM DUO38 1-E.1 GB

P2 P3 Level

00 L0
10 L1
1 1 L2&3
01 L4

11-9

CONTROL SYSTEM

CONTENT

Water Level

LEVEL4

LEVEL2&3

LEVEL1

ON

Pump

OFF

ANY

NLOAD

0

BLINK

OPER LED

NORMAL

11.17.7.2 1 Level Logic (used in all models except for floor/ceiling models)

P2 P3 Level

Water Level

OPER

LED

Don’t

care

Don’t

care

Overflow

Normal

ON

OFF

BLINK

1 Normal

0 Overflow

Overflow when

unit is ON

Overflow when

unit is OFF

11-10

NLOAD

PUMP

ANY

0

ON

OFF

NLOAD is

forced to 0

8 min 8 min

8 min

SM DUO38 1-E.1 GB

CONTROL SYSTEM

CONTENT

11.18 Indoor Unit Dry Contact

Indoor unit Dry contact has two alternative functions that are selected

by J8.

Function Contact = Open Contact = Short

J8 = Open Presence Detector Connection No Limit Forced to STBY

J8 = Short Power Shedding Function No Limit Limit NLOAD

11.19 Operating the Unit from the Mode Button

Forced operation allows starting, stopping and operating in Cooling or Heating, in pre­set temperature according to the following table:

Forced operation Mode Pre-set Temperature

Cooling 20

Heating 28

0

C

0

C

11.20 On Unit Controls and Indicators

11.20.1 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)

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.

SM DUO38 1-E.1 GB

RESET / FILTER SWITCH

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 – enable/disable the buzzer announcer, if
selected.

11-11

CONTROL SYSTEM

CONTENT

11.20.2 Indoor Unit Controls and Indicators for LCD Display

STBY Cool Heat Auto Fan Dry

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

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

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

(Low)

OFF

OFF

(Med)

(High)

(Turbo)

OFF

OFF

User
setting
IFAN
speed

User
setting
IFAN
speed

OFF

(Auto)

Backlight(red)
Backlight(green)

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

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

11.20.3 Outdoor Unit Controller Indicators

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.

User
setting
IFAN
speed

User
setting
IFAN
speed

User
setting
IFAN
speed

11-12

SM DUO38 1-E.1 GB

11.21 Jumper Settings

CONTENT

11.21.1 Indoor Unit Controller

0 = Open Jumper (disconnect jumper).
1 = Close Jumper (connect jumper).

Self test Jumper – J1

OPERATION J1
SELF-TEST 1
NORMAL 0

Compensation Jumper – J2

Model J2 (Default) Compensation

Wall Mounted 0 Activated

Floor/Ceiling 1 Deactivated

Ducted/cassette 1 Activated

Family selection Jumper – J3, J4 and J5

CONTROL SYSTEM

Family J5 J4 J3

Reserved
Reserved
Reserved
Wall Mounted (WNG/FLO)
Floor/Ceiling (PXD)
Reserved
Ducted (LS)
Cassette (K)

IDU Model

WNG25 000011
WNG35 010011
WNG50 001000
WNG60 011000
WNG80 001001
PXD25 000100
PXD35 010100
PXD50 100100
K25 000111
K35 010111
K50 100111
LS35 010110

J8 J7 J6 J5 J4 J3

0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1

Jumper Setting

SM DUO38 1-E.1 GB

For wall mounted units Jumpers j7, j8 can be configured by service. All other jumpers on
the above table are factory default (cannot be changed by service).
For unit types as Cassettes, floor ceiling, and ducted, jumpers are set by a model plug.

11-13

CONTROL SYSTEM

CONTENT

Model selection Jumper – J6, J7

Model J7 J6

9000 Btu/hr
12000 Btu/hr
18000 Btu/hr
24000 Btu/hr

J8- Clock/Power Shedding

Operation J8

Clock 0

Power Shedding 1

J9 – IFAN Cycling Disabling

0 0
0 1
1 0
1 1

Display Mode

(wall mounted units only)

LCD 0
LED 1

J9

11.21.2 Outdoor Unit Controller

11.21.2.1 JP9 JUMPER LAYOUT

Reserved (PIN 9) ODU3 (PIN 7) ODU2 (PIN 5) ODU1 (PIN 3) ODU0 (PIN 1)
GND (PIN 10) GND (PIN 8) GND (PIN 6) GND (PIN 4) GND (PIN 2)

11.21.3 ODU MODEL SELECTION

ODU3 ODU2 ODU1 ODU0 ODU Model

OFF OFF OFF OFF Reserved
OFF OFF OFF ON (PIN1 & PIN2) A (DCI 25)
OFF OFF ON (PIN3 & PIN4) OFF B (DCI 35)
OFF OFF ON (PIN3 & PIN4) ON (PIN1 & PIN2) C (DCI 50)
OFF ON (PIN5 & PIN6) OFF OFF D
OFF ON (PIN5 & PIN6) OFF ON (PIN1 & PIN2) E (Duo)
OFF ON (PIN5 & PIN6) ON (PIN3 & PIN4) OFF F

OFF ON (PIN5 & PIN6) ON (PIN3 & PIN4) ON (PIN1 & PIN2) G
ON (PIN7 & PIN8) OFF OFF OFF H
ON (PIN7 & PIN8) OFF OFF ON (PIN1 & PIN2) I
ON (PIN7 & PIN8) OFF ON (PIN3 & PIN4) OFF J
ON (PIN7 & PIN8) OFF ON (PIN3 & PIN4) ON (PIN1 & PIN2) K
ON (PIN7 & PIN8) ON (PIN5 & PIN6) OFF OFF L
ON (PIN7 & PIN8) ON (PIN5 & PIN6) OFF ON (PIN1 & PIN2) M
ON (PIN7 & PIN8) ON (PIN5 & PIN6) ON (PIN3 & PIN4) OFF N
ON (PIN7 & PIN8) ON (PIN5 & PIN6) ON (PIN3 & PIN4) ON (PIN1 & PIN2) O

11-14

SM DUO38 1-E.1 GB

11.22 Test Mode

CONTENT

11.22.1 Entering Test Mode

System can enter Test mode in two ways:

• Automatically when the following conditions exists for 30 minutes continuously:
o Mode = Cool, Set point = 16, Room temperature = 27±1, Outdoor temperature =

35±1

Or

o Mode = Heat, Set point = 30, Room temperature = 20±1, Outdoor temperature =

7±1

• Manually when entering diagnostics with the following settings:

o Mode = Cool, Set point = 16
o Mode = Heat, Set point = 30

11.22.2 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

CONTROL SYSTEM

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

11.23 Additional Functions and Operating Rules (for DUAL
split models)

The DCI SW 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.

11.23.1 System Control Concept

All indoor unit related items control remains the same as in single split applications.
All outdoor unit related control logic remains the same as in single split applications.
The MSMP controller is responsible only for the following control:

• Setting of system operation mode (cool/heat)

• Setting the NLOAD for the outdoor units

• Controlling of the EEV’s

• Dry contacts control

11.23.2 Compressor Frequency Control

11.23.3 Outdoor Unit NLOAD setting

The MSMP controller gets the NLOAD from each of the indoor units, and sends a combined
NLOAD to the outdoor unit control. The combined NLOAD is a weighted average of the
indoor units NLOAD.
The weight of the indoor units as a function of their nominal capacity:

SM DUO38 1-E.1 GB

Indoor Unit Capacity [kW] (kBtu/hr) Capacity Code

2.5 (9000) 1

3.5 (12000) 1.5

5.0 (18000) 2

7.2 (24000) 3

11-15

CONTROL SYSTEM

CONTENT

11.23.4 EEV (electronic Expansion valve) Control

EEV opening is defined as EEV = EEVOL + EEV

• 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 in cooling mode on the
relevant indoor unit super heat and compressor temperature.

• During the first 10 minutes of compressor operation EEVCV = 0.

CV

11.23.5 System Mode Setting and Reversing Valve (RV) Control

The first indoor unit that is causing the system to be turned ON sets the system mode.

11.23.6 Indoor Units Operation when Indoor Unit Mode is Different than
Outdoor Unit Mode

• Open louvers according to user selection.

• Indoor fan is forced to OFF.

11.24 Dry Contacts Control

Dry Contact Contact = Open Contact = Short

STBY No Limit System is Forced to STBY

Night No Limit Outdoor fan speed reduced to low in cooling mode

A dry contact output for Alarm will be shorted when any failure exists in the system.

11-16

SM DUO38 1-E.1 GB

11.25 SW Parameters

CONTENT

11.25.1 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:

CONTROL SYSTEM

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

SM DUO38 1-E.1 GB

11-17

CONTROL SYSTEM

CONTENT

11.25.2 Outdoor Units SW Parameters:

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

Compressor Over Heating Protection

CTTOH1 949494 90

CTTOH2 989898 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

Outdoor Fan Limit Control

OFLowFreq 45 45 40 40

OFMedFreq 57 57 70 70

11-18

SM DUO38 1-E.1 GB

12. TROUBLESHOOTING

CONTENT

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!!!

For safe handling of the controller please refer to section 1.6 below.

1.1 Dual Split System Failures and Corrective Actions

TROUBLESHOOTING

No

1 Power supply indicator at

indoor unit (Red LED) does
not light up.
Indoor fan does not start
(louvers are opened and
Green LED does light up)

3 Compressor does not start Jumper settings of

4 One indoor is operating, in

cool mode, with no
capacity, and the other unit
has water leaks/freezing
problems

5 One indoor is operating in

heat mode with a limited
capacity, and the coil on
the other unit is very hot.

6 Compressor operate but

unit generate no capacity

7 One unit only is operating Communication

8 All others Specific problems of

SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION

No power supply Check power supply from the outdoor. If

Unit in heat mode
and coil is still not
warm.
The outdoor unit is in
the opposite mode.
Problem with PCB or
capacitor

outdoor unit is not
correct
The communication
wires of the two
indoor units are
switched

EEV is stuck in close
position

problems

indoor or outdoor
units

power supply is OK, check display and
display wiring. If OK, replace controller.
Change to cool mode and check. 2

Change operation mode and check if fan
starts.
Change to high speed and Check power
supply to motor is higher than 130VAC
(for Triac controlled motor) or higher
than 220VAC for fixed speed motors, if
OK replace capacitor, if not OK replace
controller
Use diagnostics (see 1.2 below)
information on MSMP board.

Check and correct the communication
wires connection

Check EEV

Use diagnostics information on MSMP
board (see 1.2 below).
Use diagnostics information on MSMP
board (see 1.2 below), and perform
action items as recommended in single
split systems

SM DUO38 1-E.1 GB

12-1

TROUBLESHOOTING

CONTENT

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 the two indoor units to Cool/16 degrees/High indoor fan speed, or Heat/30 degrees/High indoor
fan speed, and enter diagnostics. Note: the two indoor units should be set to the same mode and fan
speed.

1.3 Judgment by MSMP Diagnostics

The MSMP controller has 11 LED’s (1 STBY LED, 5 Unit LEDs and 5 Status/Fault LEDs).
STBY LED is ON when power is ON.
5 Unit LEDs refer to four Indoor units and one Outdoor unit. They will turn on one at a time and the
corresponding Indoor/Outdoor unit status/fault code will be displayed on the Status/Fault LEDs. If
the unit is normal (no fault), the unit LED and the corresponding status will be displayed for 5
seconds and move to the next unit LED. On the other hand, if the unit is in fault, the unit LED and
the corresponding fault will be displayed for 10 seconds, and hence more time to read the fault code.

1.3.1 MSMP Fault Code for Outdoor unit:

No Problem 5 4 3 2 1
1 OCT is disconnected
2 OCT is shorted
3 CTT is disconnected
4 CTT is shorted
5 HST is disconnected (when enabled)
6 HST is shorted (when enabled)
7 OAT is disconnected (when enabled)
8 OAT is shorted (when enabled)
9 TSUC is disconnected (when enabled)
10 TSUC is shorted (when enabled)
11 IPM
12 Bad Outdoor unit EEPROM
13 DC under voltage
14 DC over voltage
15 AC under voltage
16 Indoor / Outdoor unit Communication mismatch
17 No Communication
18 Illegal Outdoor unit Model
19 Bad MSMP EEPROM
20 Heat sink Over Heating
21 Deicing
22 Compressor Over Heating
23 Compressor Over Current
…. Reserved
27 Bad Communication
… Reserved
29 No Fault (Heat Mode)
30 No Fault (Cool, Dry, Fan Mode)
31 No Fault (Stand By)

0 0 0 0 1
0 0 0 1 0
0 0 0 1 1
0 0 1 0 0
0 0 1 0 1
0 0 1 1 0
0 0 1 1 1
0 1 0 0 0
0 1 0 0 1
0 1 0 1 0
0 1 0 1 1
0 1 1 0 0
0 1 1 0 1
0 1 1 1 0
0 1 1 1 1
1 0 0 0 0
1 0 0 0 1
1 0 0 1 0
1 0 0 1 1
1 0 1 0 0
1 0 1 0 1
1 0 1 1 0
1 0 1 1 1

1 1 0 1 1

1 1 1 0 1
1 1 1 1 0
1 1 1 1 1

12-2

SM DUO38 1-E.1 GB

1.3.2 Outdoor unit diagnosis by MSMP and corrective actions

CONTENT

TROUBLESHOOTING

No.

Sensors failures of all types Check sensors connections

1

IPM Fault Electronics HW

2

Bad EEPROM No action, unless special

3

DC under/over Voltage Electronics HW

4

AC under Voltage Check outdoor unit power

5

Indoor / Outdoor unit

6

Communication mismatch

No Communication Communication or

7

Compressor Lock Switch unit to STBY and

8

Bad Communication Communication quality is

9

Fault

Probable Cause Corrective Action

or replace sensors.
Check all wiring and jumper

problem

problem

Indoor and Outdoor
controllers are with
different versions

grounding wiring is not
good.

low reliability

settings, if OK, replace
electronics.

parameters are required for
unit operation.
Check outdoor unit power
supply voltage

supply voltage
Replace Indoor controller

Check Indoor to Outdoor
wiring and grounding

restart
Check Indoor to Outdoor
wiring and grounding

SM DUO38 1-E.1 GB

12-3

TROUBLESHOOTING

CONTENT

1.3.3 MSMP Fault Code for Indoor unit:

No Problem 5 4 3 2 1

RT-1 is disconnected 0 0 0 0 1

1

RT-1 is shorted 0 0 0 1 0

2

RT-2 is disconnected 0 0 0 1 1

3

RT-2 is shorted 0 0 1 0 0

4

RGT is disconnected 0 0 1 0 1

5

Reserved 0 0 1 1 0

6
7

Communication mismatch 0 0 1 1 1

No Communication 0 1 0 0 0

8

No Encoder 0 1 0 0 1

9

Reserved 0 1 0 1 0

10

Outdoor unit fault 0 1 0 1 1

11

Reserved 0 1 1 0 0

12

Reserved. 0 1 1 0 1

13

Reserved 0 1 1 1 0

14

Reserved 0 1 1 1 1

15

Defrost protection 1 0 0 0 1

17

Deicing Protection 1 0 0 1 0

18

Outdoor Unit Protection 1 0 0 1 1

19

Indoor Coil HP Protection 1 0 1 0 0

20

Overflow Protection 1 0 1 0 1

21

Reserved 1 0 1 1 0

22

Reserved 1 0 1 1 1

23

EEPROM Not Updated 1 1 0 0 0

24

Bad EEPROM 1 1 0 0 1

25

Bad Communication 1 1 0 1 0

26

Using EEPROM data 1 1 0 1 1

27
29 No Fault (Heat Mode)
30 No Fault (Cool, Dry, Fan Mode)
31 No Fault (Stand By)

1 1 1 0 1
1 1 1 1 0
1 1 1 1 1

12-4

SM DUO38 1-E.1 GB

1.3.4 Indoor unit diagnosis by MSMP and corrective actions

CONTENT

TROUBLESHOOTING

No.

1 Sensors failures of all

types

2 IPM Fault Electronics HW

3 Bad EEPROM No action, unless special

4 DC under/over Voltage Electronics HW

5 AC under Voltage Check outdoor unit power

6 Indoor / Outdoor unit

Communication mismatch

7 No Communication Communication or

8 Compressor Lock Switch unit to STBY and

9 Bad Communication Communication quality is

Fault

Probable Cause Corrective Action

Check sensors connections

problem

problem

Indoor and Outdoor
controllers are with
different versions

grounding wiring is not
good.

low reliability

1.4 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.

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

parameters are required for
unit operation.
Check outdoor unit power
supply voltage

supply voltage
Replace Indoor controller

Check Indoor to Outdoor
wiring and grounding

restart
Check Indoor to Outdoor
wiring and grounding

1.5 Simple procedures for checking the Main Parts

1.5.1 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).

1.5.2 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.

SM DUO38 1-E.1 GB

12-5

TROUBLESHOOTING

CONTENT

1.5.3 Checking the PCB.

Appearance inspect: Check discoloration, nick and connection of copper foil, short-circuit and open
circuit, component soldering, bulgy and distortion of electrolytic capacitor.

Power circuit check: check voltage of every power level (5V, 12V, 15V) printed on back of PCB.

1.5.4 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

1.5.5 Checking the Compressor.

The compressor is brushless permanence magnetic DC motor. Three coil resistances are THE
same. Check the resistance between three poles.

1.5.6 Checking the Reverse Valve (RV).

Running in heating mode, check the voltage between two pins of reverse valve connector,

normal voltage is 220VAC.

1.5.7 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.

1.6 Precaution, Advise and Notice Items

1.6.1 High voltage in Outdoor unit controller.

Whole controller, including the wires, 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.

1.6.2 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 three minutes
after turned off. Touching the Outdoor unit controller before discharging may cause an electrical
shock. When open the Outdoor unit controller cover, don’t touch the soldering pin by hand or by
any conductive material.

Advise: 1. Open the Outdoor unit controller cover only after five minutes from power down.

2. Measure the electrolytic capacitors voltage before farther checking controller for
safety.

1.6.3 Additional advises

12-6

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.

SM DUO38 1-E.1 GB

EXPLODED VIEWS AND SPARE PARTS LISTS

CONTENT

13. EXPLODED VIEWS AND SPARE PARTS LISTS

13.1 Outdoor Unit: DUO 38 DCI / DELTA

SM DUO38 1-E.1 GB

13-1

EXPLODED VIEWS AND SPARE PARTS LISTS

CONTENT

13.2 Outdoor Unit: DUO 38 DCI / DELTA

No. Part No. Description

1 433218

2 4526340

3 4526476

4 4526475

5 433215

6 464600021

7 4526403 Partition

8 4526774

4526775 Compressor top thermistor(CTT)

9

10 4526776

11 452630201 3/8" Gas Valve(R410A)

452630200 3/8" Gas Valve(R410A)

12 4526301 1/4" Liqiud Valve(R410A)

13 4526403

4527130 terminal block

14

204107 Cable clip Nylon

15

16 4526225 Power lead wire

4526968 Grounding wire with magnetic ring

4526223 AC-IN wire

4526222 Fuse connected wire

4526226 Power lead wire
4526827 Electronical expansion valve

17
18

452682802 EEV coil CAM-MD12FKS-2White connector, 530mm)
452682800 EEV coil CAM-MD12FKS-1 (Red, 530mm)

19 4526344

20 4510677

21 4526221

22 4526204

433230 Valve Cover

23

24 4526429

25 461600010

4522509 4-Way valve coil

26

4518951 4-W valve SHF-4H for R410A

27

433228 Back Side Net

28

29 462000000

30 4519614

4519300 Nut M5 L

31

32 433225

33 4519607

34 4526298

35 433223

36 4526219

37 452823600

38 4526430

39 4526396 Choke assy. 167-021-01

40 4526224 EMI filter board 901-098-00

41 4526774

4526776

4526970

452911100
4526227 MSMP communcation board 906-002-00

43

452823600 Terminal Plate Assy.

44

Front Panel A

Air inlet ring-420

Axial fan OD=401

Resin Motor

Motor Support

Base Painting Assy.

Outdoor air thermistor(OAT)

Outdoor coil thermistor(OCT)

OUTDOOR DC INVERTER CONTROLLER

Comp. Insulation1

Nut With Flange M8

Compressor wire

Compressor Assy

Right side panel (painting plate)

4way valve soldering assy

condensor Soldering assy

Painting Top Cover

Handle

Left Side Panel Painting Plate

Bridge

Painting Insulation Plate

Fuse 6C(15A,230V)EHK:150-007-00

Therminal sheet

Valve Support(painting plate)

Outdoor air thermistor(OAT)

Outdoor coil thermistor(OCT)

Suction tube Thermistor(SUT2)

Sensor/ Suction3

13-2

SM DUO38 1-E.1 GB

APPENDIX A

CONTENT

APPENDIX A

INSTALLATION AND OPERATION MANUAL

► INSTALLATION MANUAL DUO 38 DCI / DELTA

SM DUO38 1-E.1 GB

14-1