ascon A5RT 90 BR User manual

A5RT - 2010
A5RT 90 BR
A5RT 120 BR
A5RT 150 BR
A5RT 180 BR
Models:
R410A Rooftop Packaged
B Series

1. NOMENCLATURE ..........................................................................................................1
- PRODUCT LINE-UP
2. FEATURES .....................................................................................................................3
3. APPLICATION INFORMATION.......................................................................................5
- OPERATING RANGE
- REFRIGERANT CIRCUIT DIAGRAMS
- CONTROLLERS
- INSTALLATION
4. SOUND DATA...............................................................................................................22
5. SELECTION PROCESS...............................................................................................25
- DRIVE PACKAGE
- BLOWER CURVES
6. ENGINEERING & PHYSICAL DATA............................................................................31
- SPECIFICATIONS
7. PERFORMANCE DATA................................................................................................38
- PERFORMANCE TABLE
8. DIMENSIONAL DATA....................................................................................................47
9. WIRING DIAGRAMS.....................................................................................................51
10.SERVICING & MAINTENANCE...................................................................................55
11. TROUBLESHOOTING .................................................................................................56
12. EXPLODED VIEW & PARTS LIST ...............................................................................57
TABLE OF CONTENTS

1
90 RRT5A
Capacity
Refrigerant
-B AAXF
Product Specification Variation
Type Of Connection
X : Not Applicable
Electrical Characteristic
F : 380-415V/3Ph/50Hz
Model Type
R : Heat pump
Series
B : B series
90 : 90,000 Btu/h
Model Name
RT :Rooftop
5 : R410A
Brand
A : Acson
1. NOMENCLATURE

2
Product Line-up
A5RT-BR Series
Heat pump
Rooftop controller PCB EXV Gold Fin (NA549) Scroll compressor Saranet Air Filter Side flow Convertible Filter Drier High pressure switch Low pressure switch
90BR FXAA X X X XX X X X X X X
120BR FXAA X X X X X X X X X
150BR FXAA X X X X X X X X X
180BR FXAA X X
X
X
X
X
X
X XXXXXXX
Heating Nomenclature
Classification
Model
A5RT
Heat pump
Remarks: Economizers & CO2sensor will be ready soon.

3
• PackageUnit:
 Acson’snewrangeofrooftoppackagedunitshasbeendevelopedspecicallytosuitcommercialapplications
andaredesignedtobeeasytoinstall,requiringonlyducting(andassociatedttings),power/controlwiring
anddrainpiping.Alongwiththelightgreycolour,theattopandcompactdesigngivesanaestheticandneat
appearancewheninstalledinlineofsight.Theunitcabinetismadeofpowdercoatedsheetmetalespecially
suitable for outdoor use. All parts of the structure are fastened with corrosion resistant screws and bolts.
• BaseBeam:
 Thebasebeamsarexedandprovidearigidfoundationfortheentireunit.Thebeamhastheforkliftslotsand
riggingholesforbetterhandlingpurpose.Itisalsodesignedtoallowmountingonaroofcurb,thedimension
oftheroofcurbshouldbefollowedstrictlyinaccordancewiththeinstallationmanual.
• FlexibleAirSupply:
 Sincealltheunitsutilizeabelt/pulleydrivensupplyairfan,theunitsareabletomeetawiderangeofsupply
airvolumesandexternalstaticpressures.Furthermore,thesupplyairfanmotors,pulleysandbelts(eld
supplied)canbeeasilychangedonsitetomeetexactairowandESPrequirementifrequired.
• ConvertibleReturnandSupplyAir:
 Unitcanbeeasilyconvertedfromhorizontaltovertical(downward)supplyandreturnairductconguration
byrelocatingthepanelsandsupplyairfanmounting.
• ScrollCompressor:
 Unitsareequippedwithhighefciencyandreliablescrollcompressors.Eachcompressorismountedon
rubbervibrationisolatorsinordertoreducethenoiselevelandvibrationtransmissions.
• PowderCoatedCondensateDrainPan:
 Thesheetmetalcondensatedrainpanispowdercoatedtoresistcorrosion.
• Slotsfor2inchesReturnAirFilters:
 A 2 inches rail is provided as standard in instances where a eld supplied lter casement need to be
installed.
• HigherEnergyEfciencyRating:
 TheA5RT-BRseriesisdesignedinlinewithmarketrequirementforbetterenergysaving.Its’performance
isclaimedtobeamongthebestinthemarket.
TechnicalSpecication
• Compressor
 CompressorusedinA5RT-BRseriesPackagedUnitsarehermeticallysealedscrolltype.Allthecompressors
are provided with an internal overload protection.
• Condenser
 Condenser coils are manufactured from seamless inner grooved copper tubes mechanically bonded to
aluminiumnstoensureoptimumheattransfer.AllcoilsaretestedagainstbyNitrogenholdingat609psig
andhighlypreciseHeliumleaktestat235psig.
 ALLstandardcoilsareupto3rows/14-16FPI,3/8”(9.52mm)O.D.tubes.
 HydrophilicGoldFin coating (NA549)isofferedasstandard, which haslonger life spanundercorrosive
environment.
2.FEATURES

4
• Evaporator
Evaporator coils are manufactured from seamless inner grooved copper tubes mechanically bonded to
aluminium ns to ensure optimum heat transfer. All coils are tested against by Nitrogen holding at 609psig
and highly precise Helium leak test at 235psig.
ALL standard coils are 3-4 rows / 14-16 FPI, 3/8” (9.52mm) O.D. tubes.
Hydrophilic Gold Fin coating (NA549) is offered as standard, which has longer life span under corrosive environment.
• CondenserFanandMotor
Fans are of propeller type, direct driven by weatherproof electrical induction motors. Condenser fan motor
has class F insulation and splash-proof enclosure, IP44.
• EvaporatorFanandDrive
Blower is DWDI centrifugal, forward curved type. It is mechanically and dynamically balanced and being
mounted on a rigid shaft in a self aligned bearing block.
The motor is tted with an adjustable V-belt drive, as standard. It has class B insulation and dripping water
proof, IP22.
• RefrigerantCircuit
Each refrigerant circuit shall have independent electronic expansion devices, HP/LP switch and refrigerant
line service pressure ports as standard factory installed.
• ExpansionDevice
Electronic Expansion Valve is being used to ensure accurate control of refrigerant ow.
• Casing/Structure
The unit casing used in A5RT-BR series is made of zinc coated galvanized steel sheets. It is further coated
with an electrostatic powder coat and then oven-baked for a tough and lasting weather resistant nish. Zinc
plated screws are used throughout to further reduce possibility of unit rusting.
• Insulation
ALL possible areas of condensation to happen are insulated by PE, Polyethelene. Panel insulation is 10mm
thickness while drain pan insulation is 5mm thickness.
• Control
Units shall be completely factory supplied with an integrated controlled Module, with built in resident control
algorithms to make decide heating, cooling, or ventilating operations in response to electronic signals from
indoor & outdoor temperature sensors.
• RooftopPanel-handset
Rooftop Panel comprises all starting, operating and safety controls setting. It is connected to the IC module
PCB and supplied as standard.
OptionalFeatures
• 3rdPartyThermostat
For application that requires uniform thermostat outlook with other electrical appliances. 3rd Party thermostat
can be connected to the factory supplied module via the contact point available on PCB board.
• BasicBMSConnection
Unit’s standard PCB board provides dry contact for basic BMS connection. Input signal will go to dry contact
ON/OFF, COOL/HEAT, and 4 to 20 mA temperature adjuster while output signal will come from ON/OFF,
COOL/HEAT, ALARM and DEFROST dry contact.
• Economizer(inprogressofdevelopment)
Field installed economizer is supplied from factory as an accessory. It is also designed to cater for horizontal
or vertical down throw air discharge orientation.
• CO2Sensor
Field specied CO2 sensor can be easily plug on the control board’s dry contact, which is available on the
economizer extension board.
• AuxiliaryHeater
Auxiliary heater connection point is available on the standard PCB for eld supplied heater connection.

5
Cooling
Operating Range
Ensure the operating temperature is in allowable range.
Heating
Caution :
The use of your air conditioner
outside the range of working
temperature and humidity can
result in serious failure.
0301 15
-15
-10
20
20
18
10
0
-20
27
Outdoor DB temperature (°C)
Indoor WB Temperature (°C)
Outdoor WB Temperature (°C)
Indoor DB Temperature (°C)
52
50
43
40
20
10
30
0
-10
14
10 20
19 23 30
3.APPLICATIONINFORMATION

6
RefrigerantCircuitDiagrams
1
2
3
3
4
5
6
7
10
11
8
9
13
12
7
14
15
14
Item Part’s Model/Part No/Size
1 Compressor
2 Pressure Switch 600PSI N/C
3 Access Valve
4 4WV
5 Filter Drier
6 EXV
7 Strainer
8 Accumulator
9 Pressure Switch 18PSI N/C
10 Solenoid Valve
11 Bypass Capillary Tube
12 ID Coil
13 OD Coil
14 Check Valve
15 Compensator
Note: (a) 120, 150, 180 consists of 2 circuits in the system.
(b) Item 15 is applicable for 120 only
Model: A5RT90/120/150/180BR
Cooling Operation
Heating Operation

7
Controllers
A. Operating Guide
1. Upon power up of the unit, the LCD displays the main display screen
2000/01/01 [Sat] 12:00am
2000/01/01 [Sat] 12:00am
2000/01/01 [Sat] 12:00am
2000/01/01 [Sat] 12:00am
Status : OFF
Mode : Heating
Set Temp : 24°C
2. Press the ON/OFF button for 1 second to switch on the unit if the status shows OFF. The status
will change to ON. The ON/OFF LED will light up.
3. Press the COOL button for 1 second if cooling is required or the HEAT button if heating is
required.
4. The ‘Set Temp’ refers to temperature setting.
5. Press the ▼ button once to view the compressor(s) on, off or defrost status.
Compressor 1 : ON
Compressor 2 : DEFROST
6. Press the ▼ button again to view the temperature for room and outdoor ambient.
Return Air : 24.0°C
Outdoor Air : 24.0°C
7. Press the ▼ button again to view the selected type for unit, number of compressor used, indoor
fan ‘always on’ option, model and EEPROM version.
8. Press the ▲ button to return to previous screen(s) or ESC to return to main screen.
9. Press the ALARM button to view or clear the alarm history. If alarm occurs, contact your
dealer or serviceman.
* Note: Display diagram is for illustration purpose only. It may differ for different models.
The display information shall be subjected to the setting in the main controller board.
▼
▲
▼
▲
▼
*
*
*
*
Type : H/Pump
No. Comp : 2 Comp
IDF Opt : --
Model : 5RT90BR_E
EP.Rev : 0.0

8
B. Main Menu
How to use the Main Menu?
Step 1
Press ENTER to view the sub-Menu under Main Menu.
Step 2
Go to sub-Menu by pressing the ▲ or ▼ button. Press ENTER to select the sub-Menu.
Step 3
Go to parameter to change or view by pressing the ▲ or ▼ button. Press ENTER to select
this parameter.
Step 4
Change the parameter by pressing the ▲ or ▼ button. Once completed press ENTER.
Press ESC to go back to previous screen until you see the initial display screen.
Operation Menu
Settings Menu
Note: The Set Parameter in the setting menu requires password for any changes to or to view its parameter.
CAUTION:
All the password entering must be done by local dealer/serviceman. User is not allowed to change the value
of the set parameter as this may cause damage to unit or deter its operation.
1. Changes can be made to the factory setting parameter. This is done in the Main Menu. Press ENTER button
to go into the Main Menu.
2. The Main Menu consists of Operation Menu, Settings Menu, Timer Menu, Alarm Menu, Warning Menu
and Display Menu.
This menu is to set the parameters for unit operation (requires password entering), user setting, change pass-
word, set panel option and unlock panel. The panel option enables us to set the LCD backlight and contrast,
set the alarm buzzer, enable and disable the screen saver and set a screen saver timeout and set the
temperature display in °C or °F.
This menu is to set the unit status (on or off), set the unit operation mode, change the temperature setting,
and manually defrost the unit (applicable for heating mode only).
Timer Menu
This menu is to set the clock, set the date, set a 7 days schedule to start and stop the unit and enable or
disable the set schedule.
Alarm Menu
This menu is to view the alarm history and also clear the record. The panel can keep up to 20 fault / alarm
records.
Warning Menu
This menu is to view the warning history and also to clear the record. The panel can keep up to 20 warning
records.
Display Menu
This menu is to view the indoor heat exchanger sensor(s) temperature, outdoor heat exchanger sensor(s)
temperature, discharge sensor(s) temperature, solenoid valve(s) operation status, compressor(s) run time
record, EXV opening pulse, economizer operation status (applicable for unit with economizer only), filter
checking time, control type and software version. Some of the submenu may require password for entering.

9
Main Menu
Press ENTER to go to this menu.
UNEMNIAMUNEMNIAM
Operation Menu Timer Menu
Settings Menu Alarm Menu
Timer Menu Warning Menu
Alarm Menu Display Menu
Warning Menu
Operation Menu
Select [Operation Menu] in [Main Menu] and press ENTER to go into this menu.
OPERATION MENU
Status : OFF
Mode : Heating
Set Temp : 24°C
Manual Defrost
Settings Menu
Select [Settings Menu] in [Main Menu] and press ENTER to go into this menu.
SETTINGS MENU SETTINGS MENU
Set Parameter 1drowssaPegnahC
2drowssaPegnahCgnitteSresU
Change Password 1 Panel Option
Change Password 2 Unlock Panel
Panel Option
Panel Option
Select [Panel Option] in [Settings Menu] and press ENTER to go into this menu.
Backlight ON : Normal
Alarm Buzzer : ON
Contrast : 50%
Brightness : Medium
Temp Unit : °C
Idle Pg Timeout : 10 m
Press ▲ or ▼ to select the required setting, ENTER to enter into the setting.
Press ▲ or ▼ to select the required option, ENTER to select the option.
Press ESC to exit to [Settings Menu].
*
*
*
*
*
*
There are 6 sub menus in [Main Menu]. Press ▲ or ▼ to select sub menus, ENTER to enter into the sub
menu or press ESC to exit to main display screen.
Some basic settings can be done here. Press ▲ or ▼ to select the required setting. Then, press ENTER to
enter the setting mode. Press ▲ or ▼ to toggle the setting. Press ENTER again to confirm the setting. Press
ESC to exit to [Main Menu].
Some advance settings can be found here. Press ▲ or ▼ to select the required setting. Then, press ENTER
to enter the setting mode. Press ▲ or ▼ to toggle the setting. Press ENTER again to confirm the setting.
Press ESC to exit to [Main Menu].
* Note: Display diagram is for illustration purpose only. It may differ for different models.
The display information shall be subjected to the setting in the main controller board.

10
Timer Menu
Select [Timer Menu] in [Main Menu] and press ENTER to go into this menu.
TIMER MENU
Clock Setting
Date Setting
Timer Schedule
Timer : Enable
Set Time:
hh mm
12 : 00
Set Date:
yyyy mm dd
2000 / 01 /01
Day : [Sat]
Press ▲ or ▼ to select the required option, ENTER to select the option.
Press ESC to exit to [Timer Menu].
Timer Schedule
Select [Timer Schedule] in [Timer Menu] and press ENTER to go into this menu.
TIMER SETTINGS TIMER 1
FFONO
Timer 1 Sun 0800 1800
Timer 2 Mon 0800 1800
Timer 3 Tue 0800 1800
00810080deW
*
*
*
* *
All the timer/schedule settings are included in this menu. Press ▲ or ▼ to select the required setting. Then,
press ENTER to enter the setting mode. Press ▲ or ▼ to toggle the setting. Press ENTER or to toggle the
setting. Press ENTER again to confirm the setting. Press ESC to exit to [Main Menu].
Clock Setting
Select [Clock Setting] in [Timer Menu] and press ENTER to go into this menu.
Press ▲ or ▼ to select the required option. Then, press ENTER to enter the setting mode. Press ▲ or ▼ to
toggle the setting. Press ENTER again to confirm the setting. Press ESC to exit to [Timer Menu].
Date Setting
Select [Date Setting] in [Timer Menu] and press ENTER to go into this menu.
This is the 7 days programmable timer schedule menu. There are 3 ON/OFF events in one day. User can
choose to set each day (Sunday - Saturday) ON/OFF timer. To have the schedule in operation, user needs to
set the [Timer] in [Timer Menu] to enable. Press ESC to exit to [Timer Menu].
* Note: Display diagram is for illustration purpose only. It may differ for different models.
The display information shall be subjected to the setting in the main controller board.

11
Alarm Menu/Warning Menu
Select [Alarm Menu]/[Warning Menu] in [Main Menu] and press ENTER to go to this menu.
UNEMGNINRAWUNEMMRALA
sgninraWwohSsmralAwohS
sgninraWllAesarEsmralAllAesarE
Show Alarms/Show Warnings
Select [Show Alarms]/[Show Warnings] in [Main Menu] and press ENTER to go to this menu.
Alarm 1 WARNING 1
Indoor HEX 1 Indoor HEX 1
abnormal temp deice
2000/01/01 12:00am 2000/01/01 12:00am
The record shows: - Alarm/Warning description
- Alarm/Warning occurance date
- Alarm/Warning occurance time
Display Menu
Select [Display Menu] in [Main Menu] and press ENTER to go to this menu.
UNEMYALPSIDUNEMYALPSID
Indoor HEX Sensor EXV Opening
Outdoor HEX Sensor Economizer
kcehCretliFrosneSegrahcsiD
epyTlortnoCevlaVdioneloS
noisreVerawtfoSemiTnuRpmoC
**
**
**
This place keeps records for all previous system faults/alarms/warnings.
User can view or clear these records. The panel can keep up to 20 faults/alarm warning records.
Press ESC to exit to [Main Menu].
Besides that, user can erase the alarm/warning record(s) in this menu (password is required).
Press ESC to exit to [Alarm Menu]/[Warning Menu].
This menu displays indoor heat exchanger sensor(s) temperature, outdoor heat exchanger sensor(s)
temperature, discharge sensor(s) temperature, solenoid valve(s) operation status, compressor(s) run time
record, EXV opening pulse, economizer operation status (applicable for unit with economizer only), filter
checking time, control type and software version. Some of the submenu may require password for entering.
Besides that, user can clear the compressor run time record (password is required).
Press ESC to exit to [Main Menu].
* Note: Display diagram is for illustration purpose only. It may differ for different models.
The display information shall be subjected to the setting in the main controller board.

12
C. Installation
When installing the LCD panel to the bracket,
2petS1petS
When removing the LCD panel from the bracket,
1petS 2petS
1. A 3V DC battery is supplied with the LCD. It is used to ensure that the LCD displays real time
once the timer is set.
2. The LCD is wired to the main board via CN8 connection.
Hook the LCD panel
from the bottomfirst
Push to fasten the LCD
panel to the bracket
Remove the LCD panel
from the top part first Remove the
LCD panel

13
Installation
(a)LocationForInstallation
 Installtheunitinamannerthatpreventsshortcyclingofcondenserairbackintotheunit.(Asinthecase
ofshortcircuitofdischargeair).Allowsufcientspaceformaintenancearoundtheunit.
 Whentwoormoreunitsareinstalledinalocation,theymustbepositionedsuchthatoneunitwillnotbe
takingthedischargeairfromanotherunit.
 Ensurethatthereisnoobstructionofairowintooroutoftheunit.Removeobstacleswhichblockair
intake or air discharge.
 Thelocationmustbewellventilated,inamannerthatpreventsshortcyclingofcondenserairbackinto
the unit.
 Theunitisrecommendedtoinstallin:-
A place capable of bearing the weight of the unit and isolating noise and vibration.
 Aplacethathasadequatedrainage.
A place where the unit will not be buried in snow.
 Aplacewhereairoutletportisnotexposedtostrongwind.
 Aplacewheretheairdischargeandoperatingsoundlevelwillnotannoytheneighbours.
 Thelocationwhereitisnotaccessiblebygeneralpublic.
(b)DuctConstruction
• Theseunitare equipped withsupply andreturnair openings. Ductconnection to theunit should be
madewithductangesandsecureddirectlytotheairopeningswithexibleductconnectorstoavoid
abnormalnoisetransmission.
• Topreventairleakage,allductseamsshouldbesealed.
• Ductsintheunconditionedspacemustbeinsulated.
• Ductsexposedtotheoutsidemustbeweatherproofed.
• Ductsthatenteringbuildingthroughtheroof,theenteringshouldbesealedwithweatherstrippingto
preventrain,sand,dustetc,fromenteringthebuilding.
• Correctsizeofltermustbeinstalledatthereturnairduct.
(c)UnitSupport(Fordownthrowunitonly)
1.Thegureshowstheuseoftheroofcurbformountingtheseunits.
2.Thecurbshouldbesealedandxedtotheroofbyweatherstripping.Asuggestedmeansofsealingthe
unit and roof curb as shown in the right.
3.Recommendedroofcurbdimensionisshownbelow.
Seal with tar
Roof deck
Roof curb
Unit

14
N
Section A-A
300.0
140.0
M
B
K
L
J
I
A
C
B
F
C
A
0.52
E
Section B-B
B
D
Section C-C
C
O
P
A
F
300.0
25.0
355.0
G
Dimension
Label
A5RT90BR A5RT
120/150BR A5RT180BR
A1821.0 1890.0 2448.0
1505.5 2081.0 2081.0
1881.0 1908.0 2466.0
1468.5 1998.0 1998.0
15.0 25.0 25.0
20.0 43.0 46.0
838.2 698.7 827.0
538.1 676.0 676.0
272.4 538.9 444.6
605.1 599.8 645.8
0.0 104.6 104.6
0.0 25.0 25.0
1781.0 1804.0 2362.0
479.7 475.7 589.0
50.0 52.0 52.0
15.0 25.0 25.0
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P

15
(f) Installation Clearance
Refer diagram below for the space required around the unit. Note that:-
(a) All dimensions shown are in mm.
(b) All space value shown are minimum clearance required for the unit.
(c) Unit shown in the diagram is A5RT90BR. Other models shall follow the same clearance.
(d) Unit Lifting
Holes at 4 corners of the unit base are used for unit lifting
purpose.
The spreader bar shall be slightly wider than the unit width.
The insulation should be added at 4 corners of the chain
to prevent the damage of the panel when lifting.
Note:
Unit shown in diagram is A5RT90BR.
Other models will follow the same method in lifting.
(e) Drain Piping
•A 1" MPT condensate drain fitting is provided. The
drain pipe can be led out at the front side.
•The drain pipe must be provided with a trap on the
outside of the unit and also installed at an incline
for proper drainage, as shown in the right.
•To prevent condensate formation and leakage,
provide the drain pipe with insulation to safeguard
against sweating.
•Upon completion of piping work, check that there is
no leakage and that the water drains off properly.
Chain
Lifting beam
Spreader
bar
Lifting holes for
shackle (4 corners)
Condenser
air outlet
3000
Condenser
air inlet
0021
1200
Blower & motor
service
Air filter
service
Evaporator coil
service
1200
Electrical control
circuit service
Compressor service
The drain piping should have a drain trap.
Drain piping
The drain pipe
should extend
below this level.
Drain trap
A
B
C
Note: E.S.P = External Static Pressure
Drain trap for condensate
A≥70mm
B≥2C
C≥2XE.S.P

16
(g) Unit Conversion
In the case of converting standard unit to downflow unit, follow the steps as stated below:
A5RT 90,120, 150 & 180
Remove the side panel Remove the Pulley Belt
Detached the
blower support
Detached blower
Remove screws
at both sides
For A5RT90:
The two side plates are screwed
on the blower support as shown
For A5RT120, 150 & 180:
The two down-flow
structure
are screwed to blower
Cover the
horizontal supply
opening with the
blower support that
detached from the
blower.
Turn the blower to face bottom.
Screw at both sides.
Install back the
pulley belt.
Adjust the belt
tension by
moving the
motor base
Cover the horizontal
return opening with the
cover and screw tightly
Unscrew the vertical
return cover from the
base panel
Remove the side
panel at return side
Lastly, install back the side panel Install back the pulley belt. Adjust the belt tension.
Lastly, install back the side panel
Note:
For down flow conversion, belt length will need to
be changed.
For unit with standard pulley, belt length = a mm
Shaft to shaft Distance for downflow, C-C = b mm
Step 1
Step 4 Step 3
Step 2
A5RT90 A5RT120 A5RT150 A5RT180
a
1120 1180 1150 1362
b 380 410 380 460

17
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
Tools (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
(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
D
ip-pipe
Liquid
withdrawal
Invert cylinder
without dip-pipe
(d) When charging R410A, ensure that only liquid is being withdrawn from the cylinder or can. This is to
ensure that only the original composition of R410A is being delivered into the system. The liquid composi-
tion can be different from the vapor composition.
(e) Normally, the R410A cylinder or can is being equipped with a dip pipe for liquid withdrawal. However, if the
dip pipe is not available, invert the cylinder or can so as to withdraw liquid from the valve at the bottom.
Wire Connection
•All electrical work must be carried out by qualified electrician and accordance with local supply requirement
and associate regulation.
Method for connecting electric wire
Before connecting the wire, consult the electric power company of jurisdiction.
(1) The entire wiring diagram of unit
PE
a
b
c
d
g
e
f
(2) Wiring connection to unit
Route the power supply wires and control wire through the knockout holes in the unit.
Remove the service panels and connect the units power supply wires to terminal block inside the control
box, as shown.
Power supply
Main switch/fuse
(field supply)
Power supply
wiring for unit
Unit
Remote control
Connection wiring for
unit & remote controller
Earth
a.
b.
c.
d.
e.
f.
g.