Airwell PNX 21 DCI Service manual
Below you will find brief information for PNX 9 DCI, PNX 12 DCI, PNX 18 DCI, PNX 21 DCI, and PNX 24 DCI. These wall-mounted split units offer esthetic design, compact dimensions, and low noise operation. They benefit from DC inverter technology, R410A refrigerant, and high COP. The series provides excellent cooling and heating performance, with features like networking connectivity, optional ionizer and electrostatic filter, and easy installation and service.
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PNX DCI Series
Indoor Units Outdoor Units
PNX 9 DCI GC 9 DCI
PNX 12 DCI GC 12 DCI
PNX 18 DCI GC 18 DCI
PNX 21 DCI GC 21 DCI
PNX 24 DCI GC 24 Z DCI
NOVEMBER – 2008
REFRIGERANT
R410A HEAT PUMP
SM PNXDCI 1-A.1 GB
Indoor Units Outdoor Units
PNX 9 DCI GC 9 DCI
PNX 12 DCI GC 12 DCI
PNX 18 DCI GC 18 DCI
PNX 21 DCI GC 21 DCI
PNX 24 DCI GC 24 Z DCI
NOVEMBER – 2008
REFRIGERANT
R410A HEAT PUMP
SM PNXDCI 1-A.1 GB

A
LIST OF EFFECTIVE PAGES
SM PNXDCI 1-A.1 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 ........September 2007
Total number of pages in this publication is 107 consisting of the following:
Page
No.
Revision
No. #
Page
No.
Revision
No. #
Page
No.
Revision
No. #
Title ....................... 1
A ........................... 1
i ............................. 1
1-1 - 1-4 ................ 1
2-1 - 2-4 ................ 1
3-1 ........................ 1
4-1 - 4-3 ................ 1
5-1 - 5-17 .............. 1
6-1 - 6-3 ................ 1
7-1 ........................ 1
8-1-8-3 .................. 1
9-1-9-2 .................. 1
10-1-10-2 .............. 1
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
● 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
LIST OF EFFECTIVE PAGES
SM PNXDCI 1-A.1 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 ........September 2007
Total number of pages in this publication is 107 consisting of the following:
Page
No.
Revision
No. #
Page
No.
Revision
No. #
Page
No.
Revision
No. #
Title ....................... 1
A ........................... 1
i ............................. 1
1-1 - 1-4 ................ 1
2-1 - 2-4 ................ 1
3-1 ........................ 1
4-1 - 4-3 ................ 1
5-1 - 5-17 .............. 1
6-1 - 6-3 ................ 1
7-1 ........................ 1
8-1-8-3 .................. 1
9-1-9-2 .................. 1
10-1-10-2 .............. 1
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
● 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 PNXDCI 1-A.1 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. REFRIGERATION DIAGRAMS .............................................................................9-1
10. ELECTRICAL CONNECTIONS .............................................................................10-1
11. CONTROL SYSTEM PNX 9, PNX 12 ....................................................................11-1
12. CONTROL SYSTEM PNX18, PNX 21, PNX 24 ....................................................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
TABLE OF CONTENTS
SM PNXDCI 1-A.1 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. REFRIGERATION DIAGRAMS .............................................................................9-1
10. ELECTRICAL CONNECTIONS .............................................................................10-1
11. CONTROL SYSTEM PNX 9, PNX 12 ....................................................................11-1
12. CONTROL SYSTEM PNX18, PNX 21, PNX 24 ....................................................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

1-1
INTRODUCTION
SM PNXDCI 1-A.1 GB
1. INTRODUCTION
1.1 General
The new PNX DCI INVERTER split wall mounted range has expanded, comprising the
following RC (heat pump) models:
● ST PNX 9
● ST PNX 12
● ST PNX 18
● ST PNX 21
● ST PNX 24
The indoor PNX DCI units are available as LED display types, featuring esthetic design,
compact dimensions, and low noise operation.
1.2 Main Features
The PNX 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.
● 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.
INTRODUCTION
SM PNXDCI 1-A.1 GB
1. INTRODUCTION
1.1 General
The new PNX DCI INVERTER split wall mounted range has expanded, comprising the
following RC (heat pump) models:
● ST PNX 9
● ST PNX 12
● ST PNX 18
● ST PNX 21
● ST PNX 24
The indoor PNX DCI units are available as LED display types, featuring esthetic design,
compact dimensions, and low noise operation.
1.2 Main Features
The PNX 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.
● 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.






















































































































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Key features
- DC inverter technology
- R410A refrigerant
- High COP
- Low noise operation
- Optional ionizer and ESF
- Easy installation
Frequently asked questions
The PNX DCI series uses R410A refrigerant.
DC inverter technology provides high COP.
Yes, the unit supports Indoor Air Quality features, such as – Ionizer and Active Electrostatic Filter.
The unit is supplied with a microprocessor indoor controller, and an infrared remote control, supplied as standard.