Acson international A5HDC20AR User manual

Horizontal Ducted
Condensing Unit
A5HDC-2009
Models:
A5HDC20AR
A5HDC25AR

A5HDC-2009 Table of Contents
Table of Contents
Nomenclature......................................................................................................................2
Indoor Unit .....................................................................................................................2
Outdoor Unit ..................................................................................................................3
Product Line-Up.............................................................................................................4
Features...............................................................................................................................6
Application Information .....................................................................................................7
Operating Range ...........................................................................................................7
Refrigerant Circuit Diagram ...........................................................................................8
Controller .......................................................................................................................9
Installation Guideline ...................................................................................................11
Sound Data....................................................................................................................... 18
Sound Pressure Level ................................................................................................ 18
NC Curve.................................................................................................................... 19
Engineering & Physical Data.......................................................................................... 20
General Data ............................................................................................................... 20
Component Data ......................................................................................................... 21
Safety Devices............................................................................................................ 22
Performance Data............................................................................................................ 23
Calculation Steps........................................................................................................ 23
Performance Table...................................................................................................... 27
Outline and Dimension ................................................................................................... 29
Electrical Data.................................................................................................................. 31
Wiring Diagram ................................................................................................................ 32
Service and Maintenance................................................................................................ 33
Troubleshooting .............................................................................................................. 35
Exploded View and Part List .......................................................................................... 40

2
A5HDC-2009
Nomenclature
Indoor
Nomenclature
A 5 CC 20 C R
Brand
A : Acson
Model Name
Capacity Index
Model Type
Refrigerant
“ ” : Omitted if R22
4 : R407C
5 : R410A
CC : Ceiling Concealed
20 : 20,000 Btu/h
Chassis
C : C series
“ ” : Omitted if cooling only
R : Heatpump

3
A5HDC-2009
Outdoor
Nomenclature
A 5 HDC 20 A R
Brand
A : Acson
Model Name
Capacity Index
Model Type
Refrigerant
“ ” : Omitted if R22
4 : R407C
5 : R410A
HDC : Horizontal Ducted Condensing Unit
20 : 20,000 Btu/h
Chassis
A : A series
“ ” : Omitted if cooling only
R : Heatpump

4
A5HDC-2009
Product Line-Up
Indoor Unit
A5CC-CR
Nomenclature
L2
SLM 3
Bare
Air Filter
CE EPS Drain Pan
20CR AFBA X X X X X X
25CR AFAA X X X X X X
Handset
Heat
Pump
Classification
Refrigerant Control
Marking
Air Purification
Fin Others
A5CC-CR
Nomenclature
PCB

5
A5HDC-2009 Product Line-Up
Outdoor Unit
A5HDC-AR
Cap Tube Hydrophilic Coated Rotary
CE
20AR AFBA X X X X
25AR AFAA X X X X
Heat
Pump
Compressor Others
Classification
A5HDC-AR
Nomenclature
Refrigerant Control
Fin
Marking Safety Devices

6
A5HDC-2009
Adequate External Static Pressure
The external static pressure is specially designed to blend in most of the interior design and yet to ensure a
sufcient heat transfer capability.
Aluminium Slit Fin
The unique slit n on the heat exchanger greatly increases the heat transfer efciency and thus boosts up the
unit capacity.
Short Piping
Reduce installation cost, improved reliability efciency compared to roof mounted units.
Flexibility in Installation
The supply and return grille can be selected based on end user or professional interior designer in integrating
the HDC unit to their favorite interior design.
Invisible & Evergreen
To make your condensing unit invisible by installing it above the ceiling with only the supply and return grille
exposed to view. This ceiling concealed ducted condensing type of design has made it an “evergreen” design
without scarifying the previous oor space.
Features
Features

7
A5HDC-2009
Application Information
Operating Range
Ensure the operating temperature is in allowable range.
Heatpump
Application Information
HeatingCooling
Outdoor temp. (°CDB)
Indoor temp. (°CWB)
19
35
15
46
24
STD
Outdoor temp. (°CWB)
Indoor temp. (°CDB)
-9
15 21
6
27
18
STD
Caution :
The use of your air conditioner
outside the range of working
temperature and humidity can
result in serious failure.
Note:
Standard Operating Range

8
A5HDC-2009
Application Information
Refrigerant Circuit Diagram
Model: A5CC20CR – A5HDC20AR
A5CC25CR – A5HDC25AR
70034 095378

9
A5HDC-2009 Application Information
Controller
SLM
Operation Guide
COOL
DRY
HEATMED
HIGH
AUTO
MODE
TEMP
SENSOR
ON/OFF
SLEEP
LOW
TIMER
8
2
5
9
3
6
4
1
FAN
FAN ON/OFF
TEMP
SLEEP
TIMER MODE
7
1
2
3
4
5
6
10
7
SWING
SWING
FAN
1. “ON/OFF” switch
•Press to start the air conditioner unit.
•Press again to stop the unit.
2. Temperature setting
•Set the desired room temperature.
• Press button to increase or decrease the set
temperature. Setting range are between 16°C
to 30°C (60°F to 80°F).
3. Operation Modes
•Press the “mode” button for select the type of
operating mode.
-Cooling Only: COOL, DRY, FAN
-Heat Pump : AUTO, COOL, DRY, HEAT, FAN
(AUTO mode is represented by both COOL
and HEAT LED light on)
4. Fan Speed selection.
•Press the button until the desired fan speed is
achieved.
5. Timer.
•Press the set button to select the switchtimer
of the air conditioner unit (the settingrange is
between 1 to 10 hours).
6. “Sleep” mode
• Press button to activate the sleep function can
only be activated under “cool” or heating
mode operation. Activated under “cool” mode
operation, the set temperature will increase
0.5°C after 30minutes, 1°C after 1 hour and
2°C after 2hours. If it is actiaved under
“HEAT” mode operation, the set temperature
will be descreased 0.5°C after 30 minutes,
1°C after 1 hour and 2°C after 2 hours.
7. Air Swing
• Press button to activate the automatic air
swing function.
8. Sensor
• Infra red sensor to receive signals from
wireless controller.
9. LED Display
• To display the set temperature (in °C) and
timer delay setting (in hours).
10. Transmission source
• To transmit signals to the air conditioner.

10
A5HDC-2009
Application Information
Installation Guideline
Safety Precautions
WARNING CAUTION
Installation and maintenance should be performed by
qualified persons who are familiar with local code and
regulation, and experienced with this type of appliance.
All field wiring must be installed in accordance with the
national wiring regulation.
Ensure that the rated voltage of the unit corresponds
to that of the name plate before commencing wiring
work according to the wiring diagram.
The unit must be GROUNDED to prevent possible
hazard due to insulation failure.
All electrical wiring must not touch the refrigerant
piping or any moving parts of the fan motors.
Confirm that the unit has been switched OFF before
installing or servicing the unit.
Disconnect from the main power supply before
servicing the air conditioner unit.
DO NOT pull out the power cord when the power is
ON. This may cause serious electrical shocks which
may result in fire hazards.
Keep the indoor and outdoor units, power cable and
transmission wiring, at least 1m from TVs and radios,
to prevent distorted pictures and static. {Depending on
the type and source of the electrical waves, static may
be heard even when more than 1m away}.
•
•
•
•
•
•
•
•
•
Please take note of the following important points
when installing.
Do not install the unit where leakage of flammable
gas may occur.
If gas leaks and accumulates around the unit, it
may cause fire ignition.
Ensure that drainage piping is connected properly.
If the drainage piping is not connected properly,
it may cause water leakage which will dampen
the furniture.
Do not overcharge the unit.
This unit is factory pre-charged. Overcharge will
cause over-current or damage to the compressor.
Ensure that the unit’s panel is closed after service
or installation.
Unsecured panels will cause the unit to operate
noisily.
Sharp edges and coil surfaces are potential
locations which may cause injury hazards. Avoid
from being in contact with these places.
Before turning off the power supply, set the remote
controller’s ON/OFF switch to the “OFF” position
to prevent the nuisance tripping of the unit. If this is
not done, the unit’s fans will start turning automatically
when power resumes, posing a hazard to service
personnel or the user.
Do not operate any heating apparatus too close to the
air conditioner unit. This may cause the plastic panel to
melt or deform as a result of the excessive heat.
Ensure the color of wires of the outdoor unit and
the terminal markings are same to the indoors
respectively.
IMPORTANT : DO NOT INSTALL OR USE THE
AIR CONDITIONER UNIT IN A LAUNDRY ROOM.
Do not use joined and twisted wires for incoming
power supply.
•
•
•
•
•
•
•
•
•
•
•
NOTICE
Disposal requirements
Your air conditioning product is marked with this symbol. This means that electrical and electronic products
shall not be mixed with unsorted household waste.
Do not try to dismantle the system yourself: the dismantling of the air conditioning system, treatment of
the refrigerant, of oil and of other parts must be done by a qualified installer in accordance with relevant
local and national legislation. Air conditioners must be treated at a specialized treatment facility for re-use,
recycling and recovery. By ensuring this product is disposed of correctly, you will help to prevent potential
negative consequences for the environment and human health. Please contact the installer or local authority
for more information.
Batteries must be removed from the remote controller and disposed of separately in accordance with relevant
local and national legislation.

11
A5HDC-2009 Application Information
Installation of Indoor Unit
For installation of indoor unit, please refer to the indoor unit technical manual.
Installation of Outdoor Unit
The outdoor unit has to be installed as per recommended installation clearance (Diagram A)
Make sure that the location is suitable for piping and drainage.
Precaution steps as below :
i) Use the hanging bracket supplied with the unit.
ii) Ensure the support is strong enough to withstand the weight of the unit.
iii) Incline the drain pipe as per diagram B. Do not install drain trap to the drain pipe, this is
to prevent blockage of drain pipe during heat mode when defrost is in operation.
iv) After completion of drain piping, conrm the drainage is good and there are no leaks.
Diagram A
Diagram B
Caution
Sharp edges and coil surfaces are potential injury hazard. Avoid from contact with them.

12
A5HDC-2009
Wiring
Wiring Electrical Connections
• Wiring regulations on wire diameters differ from country to country. Please refer to your
LOCAL ELECTRICAL CODES for eld wiring rules. Be sure that installation comply with
such rules and regulations.
General Precautions
• Ensure that the rated voltage of the unit corresponds to the name plate before carrying
out proper wiring according to the wiring diagram.
• Provide a power outlet to be used exclusively for each unit. A power supply disconnect
and a circuit breaker for over-current protection should be provided in the exclusive line.
• The unit must be GROUNDED to prevent possible hazards due to insulation failures.
• All wiring must be rmly connected.
• All wiring must not touch the hot refrigerant piping, compressor or any moving parts of
fan motors.
Refrigerant Piping
Maximum Pipe Length And Maximum Number Of Bends
• When the pipe length becomes too long, both the capacity and reliability drop.
As the number of bends increases, system piping resistance to the refrigerant ow
increases, thus lowering the cooling capacity, and as the result the compressor may
become defective. Always choose the shortest path and follow the recommendation as
tabulated below:
Model
Data
Max. Length, L 15 m 15 m
Max. Elevation, H 8 m 8 m
Max. No. of Bends 10 10
A5HDC20AR A5HDC25AR
Piping Sizes (Flare Connection Type)
• Piping sizes are as follows:
Model A5HDC20AR A5HDC25AR
Liquid (mm/in) 6.35 (1/4) 9.52 (3/8)
Suction (mm/in) 15.88 (5/8) 15.88 (5/8)
Application Information

13
A5HDC-2009 Application Information
Piping Connection To The Units
• Align the center of the piping and sufciently tighten the are nut with ngers.
• Finally, tighten the are nut with torque wrench until the wrench clicks.
• When tightening the are nut with torque wrench, ensure the direction for tightening
follows the arrow on the wrench.
Pipe Size (mm/in) Torque (nm)
6.35 (1/4) 18
9.53 (3/8) 42
15.88 (5/8) 65
Vacuuming and Charging
• The precharged outdoor unit does not need any vacuuming or charging. However once
it is connected, theconnecting pipe line and the indoor need to be vacuumed before
releasing refrigerant from the outdoor unit.
1) Open the service port core cap.
2) Connect pressure gauge to the service port.
3) Connect the line to vacuum pump. Open the charging manifold valve and turn the
pump on. Vacuum to -0.1MPa (-760mmHg) or lower. (Evacuation time varies by the
pump but averagely in 1 hour).
LO HI
CHARGE SET
OUTDOOR UNIT
CHARGE
CYLINDER
INDOOR UNIT
Flare Joint
Flare Valve
Diagram 1

14
A5HDC-2009
Diagram 2
4) After evacuation, unscrew the spindle (diagram 2) for the gas to run to indoor unit.
• The refrigerant gas has already charged into the outdoor unit. For the piping length of 5m.
Additional refrigerant charge after vacuuming is not necessary.
• When the piping length is more than 5m, please use the table below (unit in gram).
Model 7m 10m 15m
A5HDC20AR 40 100 200
A5HDC25AR 80 200 400
LO HI
CHARGE SET
OUTDOOR UNIT
CHARGE
CYLINDER
INDOOR UNIT
Flare Joint
Flare Valve
Application Information

15
A5HDC-2009 Application Information
Overall Checking
• Ensure the following, in particular :-
1) The unit is mounted solidly and rigid in position.
2) Piping and connections are leak proof after charging.
3) Proper wiring has been done.
• Drainage check - pour some water into drain pan.
• Test run
1) Conduct a test run after water drainage test and gas leakage test.
2) Watch out for the following :-
a) Is the electric plug rmly inserted into the socket?
b) Is there any abnormal sound from unit?
c) Is there any abnormal vibrations with regard to unit itself or piping?
d) Is there smooth drainage of water?
• Check that :-
1) Outdoor blower is running, with warm air blowing off the discharge grille (cooling cycle).
2) Indoor blower is running and discharge cool air (cooling cycle).
3) Suction (low side) pressure as recommended.
4) The remote controller incorporate a 3 minute delay in there circuit. Thus, it requires
about 3minutes before the outdoor unit can start up.
Standard Operating Condition
Heatpump
Temperature Ts °C Th °C
minimum indoor temperature 15 -
maximum indoor temperature 26.7 -
minimum outdoor temperature -2 -3
maximum outdoor temperature 24 18
Ts : Dry bulb temperature
Th : Wet bulb temperature

16
A5HDC-2009
Application Information
Special Precautions When Dealing with Refrigerant R410A Unit
(1) What is new refrigerant R410A?
R410A is a new HFC refrigerant which does not damage the ozone layer. The working
pressure of this new refrigerant is 1.6 times higher than conventional refrigerant (R22),
thus proper installation / servicing is essential.
(2) Components
Mixture weight composition R32(50%) and R125(50%)
(3) Characteristic
• R410A liquid and vapor components have different compositions when the uid
evaporates or condenses. Hence, when leak occurs and only vapor leaks out, the
composition of the refrigerant mixture left in the system will change and subsequently
affect the system performance. DO NOT add new refrigerant to leaked system. It is
recommended that the system should be evacuated thoroughly before recharging with
R410A.
• When refrigerant R410A is used, the composition will differ depending on whether it
is in gaseous or liquid phase. Hence when charging R410A, ensure that only liquid
is being withdrawn from the cylinder or can. This is to make certain that only original
composition of R410A is being charged into the system.
• POE oil is used as lubricant for R410A compressor, which is different from the
mineral oil used for R22 compressor. Extra precaution must be taken not to expose the
R410A system too long to moist air.
(4) Check list before installation / servicing
Tubing
Refrigerant R410A is more easily affected by dust of moisture compared with R22, make
sure to temporarily cover the ends of the tubing prior to installation.
• Compressor oil
No additional charge of compressor oil is permitted.
• Refrigerant
No other refrigerant other that R410A
• Tool (size of service port is different from R22 system)
Tools specically for R410A only (must not be used for R22 or other refrigerant)
i) Gauge manifold and charging hose
ii) Gas leak detector
iii) Refrigerant cylinder/charging cylinder
iv) Vacuum pump c/w adapter
v) Flare tools
vi) Refrigerant recovery machine

17
A5HDC-2009 Application Information
(5) Handling and installation guidelines
Like R22 system, the handling and installation of R410A system are closely similar.
All precautionary measures; such as ensuring no moisture, no dirt or chips in the
system, clean brazing using nitrogen, and thorough leak check and vacuuming are
equally important requirements. However, due to its hydroscopic POE oil, additional
precautions must be taken to ensure optimum and trouble free system operation.
(a) During installation or servicing, avoid prolong exposure of the internal part of the
refrigerant system to moist air. Residual POE oil in the piping and components can
absorb moisture from the air.
(b) Ensure that the compressor is not exposed to open air for more than the
recommended time specied by its manufacturer (typically less than 10 minutes).
Removed the seal plugs only when the compressor is about to be brazed.
(c) The system should be thoroughly vacuumed to 1.0 Pa (700mmHg) or lower.
This vacuuming level is more stringent than R22 system so as to ensure no
incompressible gas and moisture in the system.

18
A5HDC-2009
Sound Data
Sound Data
Sound Pressure Level
Ext. Static
(mmAq) 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz
6.5 High 42 39 36 34 28 22 17 38 33
6.0 Medium 41 37 34 31 26 20 15 36 30
3.5 Low 40 36 32 29 23 18 13 34 27
5.5 High 42 41 37 34 31 29 23 40 33
4.0 Medium 41 40 36 33 29 28 22 39 32
3.0 Low 36 35 33 31 26 27 21 36 30
A5CC25CR
Noise
Criteria
Overall
A (dBA)
1/1 Octave A-Weighted Sound Pressure (dBA), ref 20µPa
Model Speed
A5CC20CR
Microphone position: 1.4m below the centre of the unit. (GB Standard- GB/ D17758)
Tested with 2m length duct at the discharge outlet and air return inlet.
Model Measuring Location
Standard: GB/D 17758
A5CC20CR
A5CC25CR
Test Unit
2m length test duct2m length test duct
Air
1.4m
Microphone

19
A5HDC-2009 Sound Data
A5CC20CR
NC Curve
A5CC25CR
NC Curve
Sound pressure level (dB, ref 20µPa)
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
NC- 4 0
NC- 3 5
NC- 3 0
NC- 2 5
NC- 4 5
NC- 5 0
High fan
Low fan
Medium fan
Sound pressure level (dB, ref 20µPa)
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
NC-4 0
NC-3 5
NC-2 0
NC-4 5
NC-5 0
High fan
Low fan
NC-3 0
Medium fan
NC-2 5