Electra DUO 18+18 ST User manual

Service Manual
DUO EDC 18+18/24+24
REFRIGERANT
R410A
HEAT PUMP
COOLING ONLY
AUGUST - 2006
DUO Outdoor Models
DUO 18+18
DUO 24+24

A
LIST OF EFFECTIVE PAGES
Revision Y06-01 Service Manual - DUO Series
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 ........August 2006
Total number of pages in this publication is 31 consisting of the following:
Page
No.
Revision
No. #
Page
No.
Revision
No. #
Page
No.
Revision
No. #
Title....................... 0
A ........................... 0
i............................. 0
1-1 ........................ 0
2-1 - 2-2................ 0
3-1 ........................ 0
4-1 ........................ 0
5-1 - 5-8................ 0
6-1 ........................ 0
7-1 ........................ 0
8-1 ........................ 0
9-1 ........................ 0
10-1 ...................... 0
11-1....................... 0
12-1-12-2.............. 0
13-1-13-4.............. 0
Appendix A.............0
• 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

i
TABLE OF CONTENTS
Revision Y06-01Service Manual - DUO Series
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 AND PRESSURE CURVES .......................................... 5-1
6. CHARACTERISTICS SOUND LEVEL .................................................................. 6-1
7. ELECTRICAL DATA.............................................................................................. 7-1
8. WIRING DIAGRAMS ............................................................................................. 8-1
9. ELECTRICAL CONNECTIONS............................................................................. 9-1
10. REFRIGERATION DIAGRAMS............................................................................. 10-1
11. TUBING CONNECTIONS...................................................................................... 11-1
12. TROUBLESHOOTING .......................................................................................... 12-1
13. EXPLODED VIEWS AND SPARE PARTS LISTS................................................. 13-1
14. APPENDIX A ......................................................................................................... 14-1

1-1
INTRODUCTION
Revision Y06-01Series Manual - DUO Series
1. INTRODUCTION
1.1 General
The DUO EDC multi split outdoor unit series, comprise the following ST (cooling only)
and RC (heat pump) models:
• Cooling Only EDC 18+18 ST, EDC 24+24 ST
• Heat Pump EDC 18+18 RC, EDC 24+24 RC
1.2 Main Features
• R410A
• Separate and independent Refrigerant Circuits, Allowing Optimal Capacity.
• Non Depended Operating Mode Among Indoor Units, Allowing Cooling and.
Heating Operation Simultaneously.
• A Stand Alone Deicer and Discharge Pressure Protection PCB.
• Outdoor coil with hydrophilic louver fins for RC units.
• Easy installation and service.
1.3 Tubing Connections
Flare type interconnecting tubing to be produced on site.
For further details please refer to APPENDIX A on this manual.
1.4 Inbox Documentation
Each indoor unit is supplied with its own installation and operation manuals, an
additional instillation guide is provided in the DUO EDC outdoor package.
1.5 Matching Table
OUTDOOR UNITS
INDOOR UNITS
MODEL REFRIGERANT WNG 18 WNG 24
DUO 18+18 ST/RC R410A √
DUO 24+24 ST/RC R410A √

2-1
PRODUCT DATA SHEET
Revision Y06-01Service Manual - DUO Series
2. PRODUCT DATA SHEET
2.1 DUO 18+18
Model Indoor Unit WNG 18+18
Model Outdoor Unit DUO 18+18 R410A RC
Installation Method of Pipe Flared
Characteristics Units Cooling Heating
Capacity (4) Btu/hr 18250*2 18600*2
kW 5.35*2 5.45*2
Power input (4) kW 3.32 3.32
EER (Cooling) or COP(Heating) (4) W/W 3.22 3.28
Energy efficiency class A C
Power supply V/Ph/Hz 220-240V/Single/50Hz
Rated current A 14.7 14.7
Starting current A 32 / 32
Circuit breaker rating A 30
INDOOR
Fan type & quantity Cross flow*1
Fan speeds H/M/L RPM 1200/1100/1000
Air flow (1) H/M/L m3/hr 890/800/700
External static pressure Min-Max Pa N/A
Sound power level (2) H/M/L dB(A) 57/54/52
Sound pressure level (3) H/M/L dB(A) 44/41/38
Moisture removal l/hr 2
Condenstate drain tube I.D mm 16
Dimensions WxHxD mm 1060x295x210
Weight kg 14
Package dimensions WxHxD mm 1125x360x280
Packaged weight kg 17
Units per pallet units 16
Stacking height units 8
OUTDOOR
Refrigerant control Capillary tube
Compressor type,model Rotary TOSHIBA PA200X2CS-4KU1
Fan type & quantity Propeller(direct) x 2
Fan speeds H/L RPM 780
Air flow H/L m3/hr 4500
Sound power level H/L dB(A) 70
Sound pressure level (3) H/L dB(A) 60
Dimensions WxHxD mm 950X1270X340
Weight kg 110
Package dimensions WxHxD mm 1110X1425X480
Packaged weight kg 130
Units per pallet Units 1
Stacking height units 1
Refrigerant type R410A
Refrigerant chargless distance kg/m 1.57kg/7.5m
Additional charge 4≤L≤10:+0g;10<L≤18:+230g;18<L≤25:+430g
Connections between
units
Liquid line In.(mm) 1/4”(6.35)
Suction line In.(mm) 1/2”(12.7)
Max.tubing length m. 25
Max.height difference m. 15
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).

2-2
PRODUCT DATA SHEET
Revision Y06-01 Service Manual - DUO Series
2.2 DUO 24+24
Model Indoor Unit WNG 24+24
Model Outdoor Unit DUO 24+24 R410A RC
Installation Method of Pipe Flared
Characteristics Units Cooling Heating
Capacity (4) Btu/hr 22180*2 24230*2
kW 6.55*2 7.10*2
Power input (4) kW 4.65 4.81
EER (Cooling) or COP(Heating) (4) W/W 2.82 2.95
Energy efficiency class C D
Power supply V/Ph/Hz 220-240V/Single/50Hz
Rated current A 20.3 21.0
Starting current A 63 / 63
Circuit breaker rating A 30
INDOOR
Fan type & quantity Cross flow*1
Fan speeds H/M/L RPM 1300/1200/1100
Air flow (1) H/M/L m3/hr 910/820/740
External static pressure Min-Max Pa N/A
Sound power level (2) H/M/L dB(A) 60/57/55
Sound pressure level (3) H/M/L dB(A) 47/44/42
Moisture removal l/hr 2.8
Condenstate drain tube I.D mm 16
Dimensions WxHxD mm 1060x295x210
Weight kg 16
Package dimensions WxHxD mm 1125x360x280
Packaged weight kg 18
Units per pallet units 16
Stacking height units 8
OUTDOOR
Refrigerant control Capillary tube
Compressor type,model NN27VBAMT
Fan type & quantity Propeller(direct) x 2
Fan speeds H/L RPM 830
Air flow H/L m3/hr 4950
Sound power level H/L dB(A) 72
Sound pressure level (3) H/L dB(A) 61
Dimensions WxHxD mm 950X1270X340
Weight kg 110
Package dimensions WxHxD mm 1110X1425X480
Packaged weight kg 130
Units per pallet Units 1
Stacking height units 1
Refrigerant type R410A
Refrigerant chargless distance kg/m 2.15kg/7.5m
Additional charge 4≤L≤10:+0g;10<L≤15:+450g;15<L≤20:+580g
Connections between units
Liquid line In.(mm) 3/8”(9.53)
Suction line In.(mm) 5/8”(15.88)
Max.tubing length m. 20
Max.height difference m. 15
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).

3-1
RATING CONDITIONS
Revision Y06-01Service Manual - DUO Series
3. RATING CONDITIONS
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
Indoor Outdoor
Cooling Upper limit 32oC DB 23oC WB 46oC DB
Lower limit 21oC DB 15oC WB 21oC DB
Heating Upper limit 27oC DB 24oC DB 18oC WB
Lower limit 20oC DB -9oC DB -10oC WB
Voltage 1PH 198 – 264 V
3PH 360 – 440 V

4-1
OUTLINE DIMENSIONS
Revision Y06-01Service Manual - DUO Series
4. OUTLINE DIMENSIONS
4.1 Indoor Unit: WNG 18, 24
4.2 Outdoor Unit: DUO EDC 18+18, 24+24

5-1
PERFORMANCE DATA & PRESSURE CURVES
Revision Y06-01Service Manual - DUO Series
5. PERFORMANCE DATA
5.1 DUO 18+18 (Unit 1 + Unit 2)
5.1.1 Cooling Mode at 7.5m Tubing Connection.
230V : Indoor Fan at High Speed.
Entering Air DB
OD Coil(oC) Data Entering Air WB/DB ID Coil(oC)
15/21 17/24 19/27 21/29 23/32
15
TC 11.28 11.68 11.96 12.24 12.43
SC 7.75 8.08 8.39 8.60 8.76
PI 2.36 2.37 2.37 2.38 2.39
20
TC 10.91 11.50 11.86 12.14 12.41
SC 7.59 8.00 8.34 8.58 8.74
PI 2.56 2.57 2.58 2.59 2.60
25
TC 10.32 11.15 11.72 12.07 12.37
SC 7.40 7.85 8.28 8.52 8.67
PI 2.77 2.79 2.81 2.83 2.85
30
TC 9.66 10.51 11.36 11.76 12.11
SC 7.16 7.62 8.10 8.33 8.49
PI 2.99 3.03 3.06 3.08 3.11
35
TC 8.94 9.70 10.70 11.24 11.77
SC 6.81 7.30 7.91 8.14 8.30
PI 3.22 3.28 3.33 3.36 3.37
40
TC 8.13 8.85 9.66 10.56 11.10
SC 6.42 6.91 7.48 7.72 7.88
PI 3.48 3.53 3.59 3.63 3.67
46
TC 7.05 7.71 8.48 9.37 10.10
SC 5.92 6.34 6.82 7.06 7.22
PI 3.80 3.86 3.94 4.00 4.04
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
PERFORMANCE DATA & PRESSURE CURVES
Revision Y06-01 Service Manual - DUO Series
5.1.2 Heating Mode at 7.5m Tubing Connection.
230V : Indoor Fan at High Speed.
ENTERING AIR DB ID COIL(OC)
15 20 25
ENTERING WB
OD COIL(oC) TH Pl TH Pl TH Pl
-10 5.72 2.66 5.50 2.83 5.29 2.97
-7 6.16 2.72 5.94 2.87 5.72 3.03
-2 6.54 2.76 6.32 2.92 6.10 3.09
2 7.96 2.89 7.63 3.07 7.30 3.25
6 11.23 3.10 10.90 3.32 10.52 3.53
10 12.21 3.28 11.88 3.50 11.55 3.75
15 13.19 3.42 12.86 3.69 12.54 3.92
20 13.90 3.52 13.57 3.82 13.19 4.12
LEGEND
TH – Total Heating Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (oC)
DB – Dry Bulb Temp., (oC)
ID – Indoor
OD – Outdoor

5-3
PERFORMANCE DATA & PRESSURE CURVES
Revision Y06-01Service Manual - DUO Series
5.2 Pressure Curves.
5.2.1 DUO 18+18 (Unit 1 + Unit 2)
5.2.2 Cooling.
Discharge Pressure VS.Outdoor Temp
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
15 20 25 30 35 40 46
Outdoor Temp.(DB oC )
Discharge Pressure (Bar[g])
15/21(WB/DB ºC)
17/24(WB/DB ºC)
19/27(WB/DB ºC)
21/29(WB/DB ºC)
23/32(WB/DB ºC)
Suction Pressure VS.Outdoor Temp
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
15 20 25 30 35 40 46
Outdoor Temp.(DB oC )
Suction Pressure (Bar[g])
15/21(WB/DB ºC)
17/24(WB/DB ºC)
19/27(WB/DB ºC)
21/29(WB/DB ºC)
23/32(WB/DB ºC)

5-4
PERFORMANCE DATA & PRESSURE CURVES
Revision Y06-01 Service Manual - DUO Series
5.2.3 Heating.
Discharge Pressure VS.Outdoor Temp
16
18
20
22
24
26
28
30
32
34
36
38
-10 -5 0 5 10 15 20
Outdoor Temp.( WB oC )
Discharge Pressure(Bar[g])
25 DB (ºC)
20 DB (ºC)
15 DB (ºC)
Suction Pressure VS.Outdoor Temp
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
-10 -5 0 5 10 15 20
Outdoor Temp.( WB oC )
Suction Pressure(Bar[g])
15 DB (ºC)
20 DB (ºC)
25 DB (ºC)

5-5
PERFORMANCE DATA & PRESSURE CURVES
Revision Y06-01Service Manual - DUO Series
5.3 DUO 24+24 (Unit 1 + Unit 2)
5.3.1 Cooling Mode at 7.5m Tubing Connection.
230V : Indoor Fan at High Speed.
Entering Air DB
OD Coil(oC) Data Entering Air WB/DB ID Coil(oC)
15/21 17/24 19/27 21/29 23/32
15
TC 13.81 14.30 14.64 14.98 15.21
SC 8.76 9.14 9.50 9.73 9.91
PI 3.30 3.30 3.31 3.32 3.33
20
TC 13.36 14.08 14.53 14.87 15.19
SC 8.59 9.06 9.44 9.71 9.89
PI 3.58 3.59 3.60 3.62 3.63
25
TC 12.64 13.65 14.35 14.78 15.14
SC 8.37 8.88 9.37 9.64 9.81
PI 3.87 3.89 3.92 3.95 3.97
30
TC 11.82 12.87 13.90 14.40 14.83
SC 8.11 8.62 9.16 9.43 9.61
PI 4.17 4.23 4.27 4.30 4.34
35
TC 10.94 11.88 13.10 13.76 14.41
SC 7.71 8.26 8.95 9.21 9.39
PI 4.50 4.58 4.65 4.69 4.71
40
TC 9.95 10.83 11.82 12.93 13.59
SC 7.27 7.82 8.47 8.74 8.91
PI 4.86 4.93 5.01 5.08 5.13
46
TC 8.63 9.44 10.38 11.47 12.36
SC 6.69 7.17 7.72 7.99 8.17
PI 5.30 5.38 5.51 5.58 5.65
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
PERFORMANCE DATA & PRESSURE CURVES
Revision Y06-01 Service Manual - DUO Series
5.3.2 Heating Mode at 7.5m Tubing Connection.
230V : Indoor Fan at High Speed.
ENTERING AIR DB ID COIL(OC)
15 20 25
ENTERING WB
OD COIL(oC) TH Pl TH Pl TH Pl
-10 7.46 3.88 7.17 4.13 6.89 4.34
-7 8.02 3.98 7.74 4.20 7.46 4.42
-2 8.52 4.03 8.24 4.27 7.95 4.51
2 10.37 4.22 9.94 4.49 9.51 4.75
6 14.63 4.53 14.20 4.85 13.70 5.15
10 15.90 4.79 15.48 5.12 15.05 5.47
15 17.18 5.00 16.76 5.38 16.33 5.72
20 18.11 5.14 17.68 5.58 17.18 6.01
LEGEND
TH – Total Heating Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (oC)
DB – Dry Bulb Temp., (oC)
ID – Indoor
OU – Outdoor

5-7
PERFORMANCE DATA & PRESSURE CURVES
Revision Y06-01Service Manual - DUO Series
5.4 Pressure Curves.
5.4.1 DUO 24+24 (Unit 1 + Unit 2)
5.4.2 Cooling.
Discharge Pressure VS.Outdoor Temp
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
15 20 25 30 35 40 46
Outdoor Temp.(DB oC )
Discharge Pressure (Bar[g])
15/21(WB/DB ºC)
17/24(WB/DB ºC)
19/27(WB/DB ºC)
21/29(WB/DB ºC)
23/32(WB/DB ºC)
Suction Pressure VS.Outdoor Temp
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
15 20 25 30 35 40 46
Outdoor Temp.(DB oC )
Suction Pressure (Bar[g])
15/21(WB/DB ºC)
17/24(WB/DB ºC)
19/27(WB/DB ºC)
21/29(WB/DB ºC)
23/32(WB/DB ºC)

5-8
PERFORMANCE DATA & PRESSURE CURVES
Revision Y06-01 Service Manual - DUO Series
5.4.3 Heating.
Discharge Pressure VS.Outdoor Temp
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
-10 -5 0 5 10 15 20
Outdoor Temp.( WB oC )
Discharge Pressure(Bar[g])
25 DB (ºC)
20 DB (ºC)
15 DB (ºC)
Suction Pressure VS.Outdoor Temp
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
-10 -5 0 5 10 15 20
Outdoor Temp.( WB oC )
Suction Pressure(Bar[g])
15 DB (ºC)
20 DB (ºC)
25 DB (ºC)

6-1
SOUND LEVEL CHARACTERISTICS
Revision Y06-01Service Manual - DUO Series
6. SOUND LEVEL CHARACTERISTICS
6.1 Outdoor Units
6.2 Sound Pressure Level Spectrum (Measured as drawing)
DUO EDC 18+18 Cooling DUO EDC 18+18 Heating
Drawing of microphon position
1
m
Mic.
Unit
Ground
DUO EDC 24+24 Cooling DUO EDC 24+24 Heating

7-1
ELECTRICAL DATA
Revision Y06-01Service Manual - DUO Series
7. ELECTRICAL DATA
7.1 DUO EDC 18+18
Power Supply 1 PH, 220-240 VAC, 50Hz
Connected to Outdoor
Starting Current 32 / 32 A
Circuit breaker 30 A
Power supply wiring - No. x cross section 3 X 2.5 mm2
Interconnecting cable - No. x cross section 6 X 1.5 mm2
7.2 DUO EDC 24+24
Power Supply 1 PH, 220-240 VAC, 50Hz
Connected to Outdoor
Starting Current 63 / 63 A
Circuit breaker 30 A
Power supply wiring - No. x cross section 3 X 2.5 mm2
Interconnecting cable - No. x cross section 6 X 1.5 mm2
NOTE
Power wiring cord should comply with local laws and electrical
regulations requirements.

8-1
WIRING DIAGRAMS
Revision Y06-01Service Manual - DUO Series
8. WIRING DIAGRAMS
8.1 DUO EDC 18+18, 24+24
468600026/01
LEGEND: BK-Black BU-Blue BN-Brown OG-Orange RD-Red WH-White GN/YE-Yellow/Green
Cap.1
CAP.--Capacitor COMP.--Compressor
GN/YE
FM
Fan Motor
Housing
FM
GN/YE
OG
Deicer
OFAN_2
2.6
BU
RV1
RV2
4-way valve2
Transmit
4-way valvel
BU
N
BUBU
N
BU
Secondary coil
BU UNIT 1
N
UNIT 2
OG
BN BK
RV_1
OFAN_1
COMP_1
OG
BK
BN
BU
COMP_2
RV_2
N
RD
BN
BN
BU
04
CM
R
C
Comp.1
RD
2
Cap.1
RD BU
S
RD
16
BN
KM
CONTACTOR1
RD
8
UNIT 1
O.U.Terminal 1
GN/YE
GN/YE
RD
Comp.
Heater1
BU
l
OG
Comp. Heater2
BU
RD
2
BU
O.U.Terminal 2
1.6
BN
1.5
1.4
1.N
L1
OG
BK
BN
BU
RD
UNIT 2
GN/YE
2.5
2.N 2.4
L2
GN/YE BK
BN
BU
RD
I.U.Terminal 1 I.U.Terminal 2
INDOOR UNIT 1
6
5
4
N
LL
INDOOR UNIT 2
56
N4
BN
BUBU
BN
R
Terminal
RD
OG RD
WH
WH
Cap.2
OG
AC9V
BU
L
N
Power Supply
BU
BK
POWER CABLE
230V/1Ph/50Hz
OG
Bu
1
2
C2
C1
If indoor unit with electronic heater, the cables should be enlarged specifications.
CHANGE CABLE
power terminal
BU
RD
BU Cap.2
0
Comp.2
BN
SCM
C
BN
4
RD
2
1
KM
BN
CONTACTOR 2
RD
RD
68
GN/YE
OG
BK
BK
REMARKS
GN/YE
L
N
BN
BU
L1
L2
L3
no change
Multi Outdoor Unit
CABlE
unit£÷mm2
NAME
C
CABLE
CHANG CABLE C2
C1
POWER CABLE
1.5
1.0
CABKE SPECIFICATIONS
2.52.5
1.51.5
BU
GN/YE
1.5
2.5
1.51.5
RD OG
GN
1.5
0.75
BK
OFAN_1 OFAN_2NN
OTC1 OTC2
OTC_2OTC_1
COMP_1 COMP_2
Red
AC13.5V
YE
YE
WH
WH
YE
YE
WH
WH
Housing
Fan Motor
BU BU

9-1
ELECTRICAL CONNECTIONS
Revision Y06-01Service Manual - DUO Series
9. ELECTRICAL CONNECTIONS
9.1 DUO EDC 18+18, 24+24