Electra DELTA 18ST User manual

DELTA 18-21-24
Indoor Units Outdoor Units
DELTA 18 GC 18
DELTA 21 GC 22
DELTA 24 OU7-24
OU7-24Z
Service Manual
SM DELTA 1-E.0 GB JUNE – 2010
REFRIGERANT
R410A HEAT PUMP
COOLING ONLY

A
LIST OF EFFECTIVE PAGES
SM DELTA 1-E.0 GB
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 ........ JUNE 2010
Total number of pages in this publication is 93 consisting of the following:
Page
No.
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Title ....................... 0
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2-1 - 2-5 ................ 0
3-1 ........................ 0
4-1 - 4-2 ................ 0
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14-1-14-24 ............ 0
15-1-15-7 .............. 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
SM DELTA 1-E.0 GB
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. ELECTRICAL CONNECTIONS.............................................................................9-1
10. REFRIGERATION DIAGRAMS.............................................................................10-1
11. TUBING CONNECTIONS......................................................................................11-1
12. CONTROL SYSTEM .............................................................................................12-1
13. TROUBLESHOOTING ..........................................................................................13-1
14. EXPLODED VIEWS AND SPARE PARTS LISTS.................................................14-1
15. OPTIONAL ACCESSORIES .................................................................................15-1
16. APPENDIX A.........................................................................................................16-1

1-1
INTRODUCTION
SM DELTA 1-E.0 GB
1. INTRODUCTION
1.1 General
The new DELTA split wall mounted is based on the compact range. It comprise the ST
(cooling only) and RC (heat pump) models, as follows:
Cooling Only:• DELTA 18ST, DELTA 21ST, DELTA 24ST
Heat Pump:• DELTA 18RC, DELTA 21RC, DELTA 24RC
The indoor DELTA units are available as LED display types, featuring esthetic design,
compact dimensions, and low noise operation.
1.2 Main Features
The DELTA series benefits from the most advanced technological innovations, namely:
 R410A refrigerant
 Micro processor control.
 Infrared remote control with LED display.
 Indoor large diameter cross flow fan, allowing low operation sound level.
 Bended Indoor coil with treated aluminum fins and coating for improved efficiency.
 High COP.
 Easy access to the interconnecting tubing and wiring connections.
 Refrigerant pipes can be connected to the indoor unit from 5 different optional
directions.
 The units are equipped.
 Water condensate tray is equipped with two optional drain connections.
Automatic treated air sweep.
 Low indoor noise levels.
 Easy installation and service.
1.3 Indoor Unit
The indoor unit is wall mounted, and can be easily fitted to many types of residential and
commercials applications.
It includes:
 Casing with air inlet and outlet grills.
 A large-diameter tangential fan.
 Bended coil with treated aluminum fins.
 Motorized flaps.
 3-speed motor with internal protection.
 Advanced electronic control box assembly.
 Interconnecting wiring terminal block.
 Mounting plate.

1-2
INTRODUCTION
SM DELTA 1-E.0 GB
1.4 Filtration
The DELTA series presents several types of air filters:
 Easily accessible, and re-usable pre-filters (mesh).
 Pre-charged electrostatic filter (diposable).
 Active carbon filter (optional).
Active Electro Static re-usable filter (optional).
1.5 Control
The microprocessor indoor controller, and an infrared remote control, supplied as
standard, provide complete operating function and programming. For further details
please refer to the Operation Manual, Appendix A.
1.6 Outdoor Unit
The DELTA outdoor units can be installed as floor or wall mounted units by using a wall
supporting bracket. The metal sheets are protected by anti- 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.
It includes :
 Axial fan.
 Outdoor coil with hydrophilic louver fins for RC units.
 Compressor mounted in a soundproofed compartment.
 Outlet air fan grill.
 Service valves” flare” type connection.
 Interconnecting wiring terminal block.
1.7 Tubing Connections
Flare type interconnecting tubing can be produced on site.
For further details please refer to the Installation Manual, Chapter 11.
1.8 Accessories
ASK (All Season Kit):
For low ambient working conditions in cooling, an ASK can be installed inside the outdoor
unit. This kit allows cooling operation down to outdoor temp of -10 oC by gradually
controlling the outdoor fan speed motor.
RCW Wall Mounted Remote Control
The RCW remote control is mounted on the wall, and controls the unit either as an
infrared remote control or as a wired controller. The wired controller can control up to 10
Indoor units with the same program settings and adjustments.
For further details please refer to Optional Accessories, Chapter 15.
1.9 Inbox Documentation
Each unit is supplied with its own installation and operation manuals.

1-3
INTRODUCTION
SM DELTA 1-E.0 GB
1.10 Matching Table
1.10.1 R410A
OUTDOOR UNITS
INDOOR UNITS
MODEL REFRIGER. DELTA 18 DELTA 21 DELTA 24
GC 18 ST/RC R410A 
GC 22 ST/RC R410A 
GC 24 ST/RC R410A 
OU7-24 R410A 
OU7-24Z R410A 
The above table lists outdoor units and DELTA indoor units which can be matched together. In addition the
listed outdoor units can be matched with other types of indoor units such as cassettes, floor/ceiling.
For further information please refer to the relevant Service Manual.

2-1
PRODUCT DATA SHEET
SM DELTA 1-E.0 GB
2. PRODUCT DATA SHEET
2.1 DELTA 18 / GC 18 R410A
Model Indoor Unit DELTA- 18
Model Outdoor Unit GC-18
Installation Method of Pipe Flared
Characteristics Units Cooling Only Cooling Heating
Capacity (4) Btu/hr 18250 18250 18420
kW 5.35 5.35 5.40
Power input (4) kW 1.66 1.66 1.56
EER (Cooling) or COP(Heating) (4) W/W 3.22 3.22 3.46
Energy efficiency class A A B
Power supply V/Hz/Ph 220-240V/50Hz/Single
Rated current A 7.5 7 7.1
Starting current A 43
Circuit breaker rating A 15
INDOOR
Fan type & quantity Cross flow*1
Fan speeds H/M/L RPM 1200/1100/1000
Air flow (1) H/M/L m3/hr 930/840/750
External static pressure Min-Max Pa N/A
Sound power level (2) H/M/L dB(A) 56/53/50
Sound pressure level (3) H/M/L dB(A) 43/40/37
Moisture removal l/hr 1.8
Condenstate drain tube I.D mm 16
Dimensions WxHxD mm 1060/295/210
Weight kg 14
Package dimensions WxHxD mm 1115/350/260
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 1
Fan speeds H/L RPM 815
Air flow H/L m3/hr 2480
Sound power level H/L dB(A) 68
Sound pressure level (3) H/L dB(A) 57
Dimensions WxHxD mm 846/302/690
Weight kg 56
Package dimensions WxHxD mm 990/430/770
Packaged weight kg 61
Units per pallet Units 9
Stacking height units 3
Refrigerant type R410A
Refrigerant chargless distance kg/m 1.54kg/7.5m
Additional charge g/m 4mLength10m 1540g 10mLength18m 1690g
18mLength25m 1900g
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 All season kit Factory option
(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
PRODUCT DATA SHEET
SM DELTA 1-E.0 GB
2.2 DELTA 21 / GC 22 R410A
Model Indoor Unit DELTA- 21
Model Outdoor Unit GC-22
Installation Method of Pipe Flared
Characteristics Units Cooling Only Cooling Heating
Capacity (4) Btu/hr 21150 21150 22180
kW 6.2 6.2 6.50
Power input (4) kW 2.05 2.05 2.00
EER (Cooling) or COP(Heating) (4) W/W 3.02 3.02 3.25
Energy efficiency class B B C
Power supply V/Hz/Ph 220-240V/50Hz/Single
Rated current A 9.3 9.3 9.7
Starting current A 50
Circuit breaker rating A 20
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 0
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 2.3
Condenstate drain tube I.D mm 16
Dimensions WxHxD mm 1060x295x210
Weight kg 15
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 Rotary,TOSHIBA PA240X2CS-4KU1
Fan type & quantity Propeller(direct) x 1
Fan speeds H/L RPM 815
Air flow H/L m3/hr 2860
Sound power level H/L dB(A) 69
Sound pressure level (3) H/L dB(A) 59
Dimensions WxHxD mm 846/302/690
Weight kg 56
Package dimensions WxHxD mm 990/720/430
Packaged weight kg 61
Units per pallet Units 9
Stacking height units 3 levels
Refrigerant type R410A
Refrigerant chargless distance kg/m 2.0kg/7.5m
Additional charge g/m
4mLength10m:+0g;
10mLength15m:+330g;
15mLength20m:+460g
Connections between
units
Liquid line In.(mm) 3/8"(9.53)
Suction line In.(mm) 5/8"(15.88)
Max.tubing length m. Max 20
Max.height difference m. Max 15
Operation control type Remote control
Heating elements kW 1.65/0.9
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.

2-3
PRODUCT DATA SHEET
SM DELTA 1-E.0 GB
2.3 DELTA 24 / OU7-24 R410A
Model Indoor Unit DELTA- 24
Model Outdoor Unit OU7-24
Installation Method of Pipe Flared
Characteristics Units Cooling Only Cooling Heating
Capacity (4) Btu/hr 23100 23100 24150
kW 6.77 6.77 7.08
Power input (4) kW 2.24 2.24 2.35
EER (Cooling) or COP(Heating) (4) W/W 3.02 3.02 2.95
Energy efficiency class B B D
Power supply V/Hz/Ph 220-240V/50Hz/Single
Rated current A 10.5 10.5 11.0
Starting current A 63
Circuit breaker rating A 20
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 2.3
Condenstate drain tube I.D mm 16
Dimensions WxHxD mm 1060x295x210
Weight kg 15
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 Rotary
Fan type & quantity AXIAL*1
Fan speeds H/L RPM 850 720
Air flow H/L m3/hr 3100 2600
Sound power level H/L dB(A) 67 62
Sound pressure level (3) H/L dB(A) 58 54
Dimensions WxHxD mm 900/680/340
Weight kg 74
Package dimensions WxHxD mm 985/730/406
Packaged weight kg 77
Units per pallet Units 6
Stacking height units 2 levels
Refrigerant type R410A
Refrigerant chargless distance kg/m 2.035kg/12.5m
Additional charge g/m 12.5m<dd 350g<15m;
15m<dd 1040g<20m;
Connections between
units
Liquid line In.(mm) 3/8"(9.53)
Suction line In.(mm) 5/8"(15.88)
Max.tubing length m. Max 20
Max.height difference m. Max 15
Operation control type Remote control
Heating elements kW
Others All season kit Factory option
(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
PRODUCT DATA SHEET
SM DELTA 1-E.0 GB
2.4 DELTA 24 / OU7-24Z R410A
Model Indoor Unit DELTA- 24
Model Outdoor Unit OU7-24Z
Installation Method of Pipe Flared
Characteristics Units Cooling Only Cooling Heating
Capacity (4) Btu/hr 23100 23100 24150
kW 6.77 6.77 7.08
Power input (4) kW 2.24 2.24 2.35
EER (Cooling) or COP(Heating) (4) W/W 3.02 3.02 2.95
Energy efficiency class B B D
Power supply V/Hz/Ph 220-240V/50Hz/Single
Rated current A 10.5 10.5 11.0
Starting current A 63
Circuit breaker rating A 20
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 2.3
Condenstate drain tube I.D mm 16
Dimensions WxHxD mm 1060x295x210
Weight kg 15
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 Rotary
Fan type & quantity AXIAL*1
Fan speeds H/L RPM 850 720
Air flow H/L m3/hr 3100 2600
Sound power level H/L dB(A) 67 62
Sound pressure level (3) H/L dB(A) 58 54
Dimensions WxHxD mm 900/680/340
Weight kg 64
Package dimensions WxHxD mm 985/730/406
Packaged weight kg 67
Units per pallet Units 6
Stacking height units 2 levels
Refrigerant type R410A
Refrigerant chargless distance kg/m 1.7kg / 7.5m
Additional charge g/m 7.5m<dd 30g / <15m;
Connections between
units
Liquid line In.(mm) 3/8"(9.53)
Suction line In.(mm) 5/8"(15.88)
Max.tubing length m. Max 15
Max.height difference m. Max 7
Operation control type LCD Remote control
Heating elements 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.