Page 1
Models:
A4LC10B/BR
A4LC15B/BR
A4LC20B/BR
A4LC25B/BR
A4LC30C/CR
A4LC40C/CR
A4LC50C/CR
Manual No: TMA-A4LC-CR-1250
R407C Air-Cooled
Split Systems
Page 2
PAGE
1. INTRODUCTION TO REFRIGERANT R407C 1
2. SPECIFICATIONS 2
3. OUTLINES AND DIMENSIONS 3 - 4
4. WIRING DIAGRAMS 5 - 8
5. SPECIAL PRECAUTIONS 9 – 10
6. INSTALLATION 11 – 15
7. SERVICING AND MAINTENANCE 16 – 17
8. TROUBLESHOOTING 18 - 23
9. PARTS LIST 24 – 27
CONTENTS
Page 3
1
ENVIRONMENTAL FRIENDLY
The Montreal Protocol regulation calls for the phase-out of HCFCs by the year 2030 to prevent the ozone
layer from further depletion. R407C is an environment friendly refrigerant to replace R22. The operating
characteristics of R407C system bears close similarity to that of R22. R407C thermophysical properties
such as pressure-temperature behavior, and heat-transfer characteristic are somewhat similar to the
properties of R22.
Physical Property R407C R22
Molecular Wt (g/mol) 86.2 86.5
Vapor Density (kg/m3) 42.0 44.2
Liquid Density (kg/m3) 1134 1195
Boiling Point (°C)
-37.1 to -44.3 -40.8
Latent Heat Vap (kJ/kg) 245 234
Ozone Depletion Potential 0.00 0.05
Global Warming Potential 1600 1700
R407C CHARACTERISTICS
R407C is a ternary mixture of R32, R125, and R134a with weight composition of 23%, 25% and 52%
respectively. These three components have different vapor pressure and boiling points. R407C liquid and
vapor components have different compositions when the fluid evaporates or condenses. This gives rise
to a temperature glide where the bubble point and dew point are of different temperatures. The effect of
glide in heat exchangers is that as the refrigerant mixture flows through the tubing at constant pressure,
the evaporating temperature will change as the composition of the liquid and vapor phases change.
Typically, the glide for R407C is about 5°C to 10°C. The extend of temperature glide actually varies with
the pressure and composition of components present in the mixture during the leak.
The main concerns for R407C is its zeotropic nature. When leak occurs and only vapor leaks out, the
composition of the refrigerant mixture left in the system will change. Especially, when the system is idle,
R32 being the lightest component will leak out more than the other components. What remains in the
system will be of different composition. If the leaked system is subsequently top-up with R407C, the
mixture in the system will varies from the original composition percentage ratio.
This composition shift will slightly affect the system performance. However, study has shown that after a
series of repeated leaks and top-ups, the system capacity drops up to 6%.
Another concern for R407C system is the lubricant used for its compressor. Like all HFC refrigerants,
R407C uses polyol ester oil (POE) as its lubricant. This hydroscopic oil is prone to moisture
contamination. Extra precaution must be taken not to expose the R407C system too long to moist air; as
the oil will soak up the moisture into the system.
1. INTRODUCTION TO REFRIGERANT R407C
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2
COOLING ONLY
HEAT PUMP
1) ALL SPECIFICATIONS ARE SUBJECTED TO CHANGE BY THE MANUFACTURER WITHOUT PRIOR NOTICE.
2) ALL UNITS ARE BEING TESTED AND COMPLY TO ARI 210/240-89.
3) NOMINAL COOLING AND HEATING CAPACITY ARE BASED ON THE CONDITIONS BELOW :
a) COOLING – 26.7°C DB / 19.4°C WB INDOOR AND 35°C DB OUTDOOR.
b) HEATING – 21.1°C DB / 15.6°C WB INDOOR AND 8.3°C DB / 6.1°C WB OUTDOOR.
2. SPECIFICATIONS
MODEL OUTDOOR UNIT A4LC10B A4LC15B A4LC 20B A4LC 25B A4LC30C A4LC40C A4LC50C
NOMINAL kcal/h 2,268 2,772 4,612 5,292 7,560 9,576 12,600
COOLING W 2,637 3,223 5,363 6,155 8,792 11,134 14,650
CAPACITY Btu/h 9,000 11,000 18,300 21,000 30,000 38,000 50,000
REFRIGERANT / CONTROL
POWER SOURCE V/Ph/Hz
COMPRESSOR TYPE
CAPACITOR µF 30 30 45 50 50 - -
RATED RUNNING CURRENT A 4.00 6.20 9.91 12.50 11.40 6.30 8.20
RATED INPUT POWER W 900 1,350 2,112 2,660 2,560 3,741 4,328
PROTECTION DEVICE
FAN TYPE / DRIVE
BLADE MATERIAL
DIAMETER mm/in
RATED RUNNING CURRENT A
RATED INPUT POWER W
MATERIAL
DIAMETER mm/in
THICKNESS mm/in
MATERIAL
THICKNESS mm/in
ROW 1
FIN PER INCH 16
FACE AREA
m2/ft
2
HEIGHT mm/in
DIMENSION WIDTH mm/in
DEPTH mm/in
WEIGHT kg 31.0 34.0 57.0 58.0 92.5 98.9 115
MATERIAL
CASING THICKNESS mm/in
FINISHING
TYPE
SIZE LIQUID mm/in 6.35 / 1/4 6.35 / 1/4 6.35 / 1/4 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8
GAS mm/in 9.52 / 3/8 12.70 / 1/2 15.88 / 5/8 15.88 / 5/8 15.88 / 5/8 19.05 / 3/4 19.05 / 3/4
PACKING HEIGHT mm/in
DIMENSION WIDTH mm/in
DEPTH mm/in
REFRIGERANT CHARGE kg 0.78 0.93 1.65 1.65 1.90 3.13 3.15
1,000 / 39.4
1,200 / 47.2
560 / 22.0
1,030 / 40.6
400 / 15.7
GALVANIZED MILD STEEL
1.0 ~ 2.3 (0.0393 - 0.0905)
2
16
0.87 / 9.33
850 / 33.5
241
SEAMLESS COPPER
9.52 / 3/8
0.36 / 0.014
406 / 16 610 / 24
1.09
R407C / CAPILLARY TUBE (OUTDOOR) + (TXV)
240 / 1 / 50 415 / 3 / 50
SCROLL
OUTDOOR UNIT
0.51 / 5.53
646 / 25.4
840 / 33.1
330 / 13.0
0.32 / 3.50
494 / 19.4
OVERLOAD PROTECTION
PROPELLER / DIRECT
GLASS REINFORCED ACRLY STYRENE RESIN
2
14
1
19
FAN
0.56
R407C / CAPILLARY TUBE (OUTDOOR)
ROTARY HERMATIC
335 / 14
COMP
PIPE
FLARE VALVE / AEROQUIP
COIL
TUBE
FIN
740 / 29.1
270 / 10.6
ALUMINIUM (SLIT FIN TYPE)
0.127 / 0.005
401 / 15.8
0.8 / 0.031
0.28
62
710 / 28.0
957 / 37.7
461 / 18.1
EPOXY POLYESTER POWDER
FLARE VALVE
133
558 / 22.0
851 / 33.5
MODEL OUTDOOR UNIT A4LC10BR A4LC15BR A4LC 20BR A4LC 25BR A4LC 30CR A4LC 40CR A4LC 50CR
NOMINAL kcal/h
2,268 2,772 4,536 5,170 7,310 9,830 12,100
COOLING W
2,637 3,223 5,274 6,008 8,499 11,430 14,068
CAPACITY Btu/h
9,000 11,000 18,000 20,500 29,000 39,000 48,000
NOMINAL kcal/h
2,394 3,150 4,790 6,050 7,812 10,332 12,600
HEATING W
2,784 3,663 5,569 7,034 9,083 12,013 14,654
CAPACITY Btu/h
9,500 12,500 19,000 24,000 31,000 41,000 50,000
REFRIGERANT / CONTROL
POWER SOURCE V/Ph/Hz
COMPRESSOR TYPE
CAPACITOR µF
30 30 45 50 50 NIL NIL
RATED RUNNING CURRENT (COOLING) A
4.00 6.20 9.50 12.60 11.50 6.20 8.80
RATED RUNNING CURRENT (HEATING) A
3.30 5.70 10.10 12.50 11.40 5.90 7.80
RATED INPUT POWER (COOLING) W
900 1,350 2,002 2,571 2,424 3,565 4,615
RATED INPUT POWER (HEATING) W
750 1,200 2,096 2,549 2,407 3,280 3,734
PROTECTION DEVICE
FAN TYPE / DRIVE
BLADE MATERIAL
DIAMETER mm/in
RATED RUNNING CURRENT A
RATED INPUT POWER W
MATERIAL
DIAMETER mm/in
THICKNESS mm/in
MATERIAL
THICKNESS mm/in
ROW
FIN PER INCH
FACE AREA
m2/ft
2
0.56 / 6.00
HEIGHT mm/in
772 / 30.40
DIMENSION WIDTH mm/in
991 / 39.00
DEPTH mm/in
400 / 15.75
WEIGHT kg
31.0 34.0 57.0 58.0 92.5 98.9 115.0
MATERIAL
CASING THICKNESS mm/in
FINISHING
TYPE
SIZE LIQUID mm/in
6.35 / 1/4 6.35 / 1/4 6.35 / 1/4 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8
GAS mm/in
9.52 / 3/8 12.70 / 1/2 15.88 / 5/8 15.88 / 5/8 15.88 / 5/8 19.05 / 3/4 19.05 / 3/4
PACKING HEIGHT mm/in
DIMENSION WIDTH mm/in
DEPTH mm/in
REFRIGERANT CHARGE kg
0.98 1.00 1.70 1.65 2.35 3.10 3.35
558 / 22.0
851 / 33.5
401 / 15.8
0.77 / 8.29
960 / 37.80
1,095 / 43.10
437 / 17.20
740 / 29.1
270 / 10.6
GALVANIZED MILD STEEL
2
16
0.32 / 3.50
494 / 19.4
1
19
2
14
ALUMINIUM (SLIT FIN TYPE)
0.127 / 0.005
9.52 / 3/8
0.36 / 0.014
1.09
241
SEAMLESS COPPER
0.28
62
0.56
R407C / CAPILLARY TUBE (OUTDOOR)
240 / 1 / 50
ROTARY HERMATIC
OVERLOAD PROTECTION
R407C / CAPILLARY TUBE (OUTDOOR) + (TXV)
415 / 3 / 50
SCROLL
1,016 / 40.0
1,207 / 47.5
559 / 22.0
1.0 - 2.3 ( 0.0393 - 0.0905 )
FLARE VALVE
EPOXY POLYESTER POWDER
FLARE VALVE / AEROQUIP
710 / 28.0
957 / 37.7
461 / 18.1
610 / 24
PROPELLER / DIRECT
GLASS REINFORCED ACRLY STYRENE RESIN
335 / 14
TUBE
FIN
PIPE
406 / 16
330 / 13.0
0.8 / 0.031
0.51 / 5.53
646 / 25.4
840 / 33.1
133
OUTDOOR UNIT
COMP
FAN
COIL
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3
MODEL : A4LC 10B / 15B, 10BR / 15BR
All dimensions in mm
MODEL : A4LC 20B / 25B, 20BR / 25BR
All dimensions in mm
3. OUTLINES AND DIMENSIONS
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4
MODEL : A4LC 30/40/50C, A4LC 30/40/50CR
All dimensions in mm
Sharp edges and coil surfaces may cause injury. Wear protective
gloves when handling the unit.
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5
MODEL : A4LC 10/15B
MODEL : A4LC 10/15BR
4. WIRING DIAGRAMS
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6
MODEL : A4LC 20/25B
MODEL : A4LC 20/25BR
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7
MODEL :A4LC 30C
MODEL : A4LC 30CR
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8
MODEL : A4LC 40/50C
MODEL : A4LC 40/50CR
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9
1) What is new refrigerant R407C?
R407C is a zeotropic refrigerant mixture which has zero ozone depletion potential and thus
conformed to the Montreal Protocol regulation. It requires Polyol ester oil (POE) oil for its
compressor's lubricant. Its refrigerant capacity and performance are about the same as the
refrigerant R22.
2) Components
Mixture weight composition R32(23%), R125(25%), R134a(52%)
3) Characteristic
• R407C liquid and vapor components have different compositions when the fluid 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. If just
additional refrigerant is added to leaked system, system performance will drop. It is recommended
that the system should be evacuated thoroughly before recharging with R407C.
• When refrigerant R407C is used, the composition will differ depending on whether it is in gaseous or
liquid phase. Hence when charging R407C, ensure that only liquid is being withdrawn from the
cylinder or can. This is to make certain that only original composition of R407C is being charged into
the system.
• POE oil is used as lubricant for R407C compressor, which is different from the mineral oil used for
R22 compressor. Extra precaution must be taken not to expose the R407C system too long to moist
air.
4) Check list before installation/servicing
• Tubing
Refrigerant R407C 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 R407C
• Tools
Tools specifically for R407C only (must not be used for R22 or other refrigerant)
i) Manifold gauge 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 R407C 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 zeotropic
nature of R407C and its hydroscopic POE oil, additional precautions must be taken to ensure optimum
and trouble-free system operation.
a) Filter-dryer must be installed along the liquid line for all R407C air conditioners. This is to minimise
the contamination of moisture and dirt in the refrigerant system. Filter-dryer must be of molecular
sieve type. For a heat-pump system, install a two-way flow filter dryer along the liquid line.
b) 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.
5. SPECIAL PRECAUTIONS WHEN DEALING WITH REFRIGERRANT R407C UNIT
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10
c) Ensure that the compressor is not expose to open air for more than the recommended time
specified by its manufacturer (typically less than 10 minutes). Removed the seal-plugs only when
the compressor is about to be brazed.
d) 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.
e) When charging R407C, ensure that only liquid is being withdrawn from the cylinder or can. This is
to ensure that only the original composition of R407C is being delivered into the system. The liquid
composition can be different from the vapor composition.
Composition of R407C in vapor
phase is different from liquid phase.
f) Normally, the R407C 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.
g) When servicing leak, the top-up method, commonly practiced for R22 system, is not recommended
for R407C system. Unlike R22 where the refrigerant is of a single component, the composition of
R407C, which made-up of three different components, may have changed during the leak.
Consequently, a top-up may not ensure that the R407C in the system is of original composition.
This composition shift may adversely affect the system performance. It is recommended that the
system should be evacuated thoroughly before recharging with R407C.
R32/R125/R134
33% / 33% / 34%
23% / 25% / 52%
Dip-pipe
Invert cylinder
without dip-pipe
Liquid
withdrawal
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11
Sharp edges and coil surface are potential injury hazard. Avoid from contact with them.
(1) INSTALLATION OF INDOOR UNIT
For installation of indoor unit, please refer to the indoor unit technical manual.
(2) INSTALLATION OF OUTDOOR UNIT
As condensing temperature rises, evaporating temperature rises and cooling capacity drops. In order to
achieve maximum cooling capacity, the location selected for outdoor unit should fulfill the following
requirements :-
• Install the condensing (outdoor) unit in a way such that hot air distributed by the outdoor condensing
unit cannot be drawn in again (as in the case of short circuit of hot discharge air). Allow sufficient
space for maintenance around the unit.
• Ensure that there is no obstruction of air flow into or out of the unit. Remove obstacles that block air
intake or discharge.
• The location must be well ventilated, so that the unit can draw in and distribute plenty of air thus
lowering the condensing temperature.
• A place capable of bearing the weight of the outdoor unit and isolating noise and vibration.
• A place protected from direct sunlight. Otherwise use an awning for protection, if necessary.
• The location must not be susceptible to dust or oil mist.
6. INSTALLATION
Caution
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INSTALLATION CLEARANCE
• Outdoor units must be installed such that there is no short circuit of the hot discharge air or
obstruction to smooth air flow. Select the coolest possible place where intake air should not be hotter
than the outside temperature (max. 45°C)
Minimum Distance A B C D
Series I 150 mm 1,000 mm 150 mm 500 mm
Series II 300 mm 1,000 mm 300 mm 500 mm
(3) REFRIGERANT PIPING
Must install a molecular-sieve type filter dryer along the liquid line.
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 flow increases. This will lower the
cooling capacity and as a result, the compressor may become defective. Always choose the shortest
path and follow the recommendation as tabulated below :
MODELS
DATA
10 15 20 25 30 40 50
Max. Length (m) 7 10 15 15 20 20 20
Max. Elevation (m) 5 5 8 8 10 10 10
Max. No of Bends 10 10 10 10 10 10 10
PIPING SIZES (FLARE CONNECTION TYPE)
• Piping sizes are as follows :
MODELS
10 15 20 25 30 40 50
Liquid (mm/in)
6.35 (1/4) 6.35 (1/4) 6.35 (1/4) 9.52 (3/8) 9.52 (3/8) 9.52 (3/8) 9.52 (3/8)
Suction (mm/in)
9.52 (3/8) 12.70 (1/2) 15.88 (5/8) 15.88 (5/8) 15.88 (5/8) 19.05 (3/4) 19.05 (3/4)
PIPING CONNECTION TO THE UNITS
• Align the centre of the piping and sufficiently tighten the flare nut with fingers.
• Finally, tighten the flare nut with torque wrench until the wrench clicks.
• When tightening the flare 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
9.52 (3/8) 42
12.70 (1/2) 55
15.88 (5/8) 65
19.05 (3/4) 78
Caution
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(4) WIRING
ELECTRICAL CONNECTIONS
• Wiring regulations on wire diameters differ from country to country. Please refer to your LOCAL
ELECTRICAL CODES for field 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 firmly connected.
• All wiring must not touch the hot refrigerant piping, compressor or any moving parts of fan motors.
(5) VACUUMING AND CHARGING
• The pre-charged outdoor unit does not need any vacuuming or charging. However once it is
connected, the connecting pipe line and the indoor need to be vacuumed before releasing R407C
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. 1 Mpa (-760mmHg) or lower. Evacuation time varies by the capacity of the pump
but average time is approximately 1 hour.
Diagram 1
4) After evacuation, unscrew the spindle (Diagram 2B) for the gas to run to indoor unit.
Diagram 2
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R407C must be charged as liquid. Usually R407C cylinder is equipped with a dip-pipe for
liquid withdrawal. If there is no dip-pipe, the cylinder should be inverted so as to withdraw
liquid R407C from the valve.
Do not top-up when servicing leak, as this will reduce the unit performance. Vacuum the unit
thoroughly and then charge the unit with fresh R407C according to the amount recommended
in the specification.
(6) ADDITIONAL CHARGE
• The refrigerant gas has already been pre-charged into the outdoor unit. For the piping length of 5m
and below, additional refrigerant charge after vacuuming is not necessary.
• When the piping length is more than 5m, please use the table below (unit in grams).
MODEL 7m 10m 15m 20m
10
40 100 200 -
15
40 100 200 -
20
40 100 200 -
25
80 200 400 -
30
90 225 450 675
40
90 225 450 675
50
90 225 450 675
Caution
Caution
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Avoid prolong exposure of an opened compressor, or the internal part of refrigerant piping to
moist air. The POE oil in the compressor and piping can absorb moisture from air.
(7) 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 firmly 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) Condenser fan is running, with warm air blowing off the condensing unit.
2) Evaporator blower is running and discharge cool air.
3) Suction (low side) pressure as recommended.
4) The remote controller incorporate a 3 minute delay in the circuit. Thus, it requires about 3
minutes before the condensing unit can start up.
(8) STANDARD OPERATING CONDITION
COOLING ONLY UNIT
Temperature Ts °C
Th °C
Minimum indoor temperature
19.4 13.9
Maximum indoor temperature
26.7 19.4
Minimum outdoor temperature
19.4 13.9
Maximum outdoor temperature
46.0 24.0
HEAT PUMP UNIT
Temperature Ts °C
Th °C
Minimum indoor temperature
10.0 -
Maximum indoor temperature
26.7 -
Minimum outdoor temperature
-8.0 -9.0
Maximum outdoor temperature
24.0 18.0
Ts : Dry bulb temperature
Th : Wet bulb temperature
Caution
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Disconnect from Main Supply before Servicing the air conditioner
The unit is designed to give a long life operation with minimum maintenance required. However, it should
be regularly checked and the following items should be given due attention.
Components Maintenance Procedure Recommended Schedule
Air Filters
(Indoor unit)
1. Clean with a vacuum cleaner, or by
tapping lightly on any hard surface and
then washing in lukewarm water (below
40°C) With neutral soap.
2. Rinse well to dry before re-installing.
3. Note : Never use petrol, thinner, benzene
or any other chemicals.
Every 2 weeks.
More frequently if required.
Indoor Unit 1. Clean away dirt or dust on grille or panel
by wiping with a soft cloth soaked in
lukewarm (or cold) water or neutral
detergent solution.
2. Note: Never use petrol, thinner, benzene
or any other volatile chemicals, which
may cause plastic surface to deform.
Every 2 weeks.
More frequently if required.
Condensate Drain
Pan & Pipe
1. Check and clean. Every 3 months.
Indoor Fan 2. Check for unusual noise. As necessary.
Indoor/Outdoor Coil 1. Check and remove dirt which are
clogged between fins.
2. Check and remove obstacles which
hinder air flow in and out of
indoor/outdoor unit.
Every month.
Every month.
Electrical 1. Check voltage, current and wiring.
2. Check faulty contacts caused by loose
connections, foreign matters, etc.
Every 2 months.
Every 2 months.
Compressor 1. No maintenance needed if refrigerant
circuit remains sealed. However, check
for refrigerant leak at joints & fittings.
Every 6 months.
Compressor
Lubrication
1. Oil is factory charged. Not necessary to
add oil if circuit remains sealed.
No maintenance required.
Fan Motors
Lubrication
1. All motors pre-lubricated and sealed at
factory.
No maintenance required.
7. SERVICING AND MAINTENANCE
Caution
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PRE-START UP MAINTENANCE (AFTER EXTENDED SHUTDOWN)
- Inspect thoroughly and clean indoor and outdoor units.
- Clean or replace air filters.
- Clean condensate drain line.
- Clean clogged indoor and outdoor coils.
- Check fan imbalance before operation.
- Tighten all wiring connections and panels.
- Check for refrigerant leakage
The design of the outdoor series allows servicing to be carried out readily and easily. The removal of the
top side, front and back panel make almost every part accessible.
CAUTION!
Do not charge OXYGEN, ACETYLENE OR OTHER FLAMMABLE and poisonous gases into
the unit when performing a leakage test or an airtight test. These gases could cause severe
explosion and damage if expose to high temperature and pressure.
It is recommended that only nitrogen or refrigerant be charged when performing the leakage
or airtight test.
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When any air-conditioner malfunction is noted, immediately switch off the power supply to the
unit, and contact the local dealer, if necessary. Some simple troubleshooting tips are given
below :
FAULT CAUSE
1. Fan does not work 3 minutes
after starting
• Protection against the frequent starting. Wait 3 or
4 minutes.
2. The air conditioning unit does not
work
• Power failure or you must be replaced the fuse.
• The power plug is disconnected.
• Possibility of making a programming error in the
controller.
• If the fault persist after these verifications, contact
your installer.
3. The air conditioning unit does not
blow sufficiently
• The air filter is dirty.
• The doors or windows are open.
• The air entrance and exit are clogged.
• The regulate temperature is not high enough.
4. The remote control light is
deficient
• The batteries are discharge.
• The batteries are not correctly inserted.
• The assembly is not good.
5. Air discharge flow has a bad
odor
• This odor can be caused by cigarette smoke
particles, perfume, sweat, which stick to the coil.
• Check if there is any moisture on the walls,
garment, other.
• Check the drain pan.
6. Condensation on the air grille of
indoor unit
• This is due to air humidity after a long time of
operation.
• The unit has a lower temperature point, increase
the point and operate at high speed.
7. The water flow of air conditioning
unit
• Check the condensate evacuation.
8. The air conditioning unit are
noisy
• <<Air flow noise>> : refrigerant fluid admission in
evaporator.
8. TROUBLESHOOTING
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19
FOR COOLING ONLY MODELS OR HEAT PUMP MODELS (COOLING
CYCLE)
DIAGNOSIS BY FLOW CHART
The following chart are efficient checking procedures for troubleshooting when these fan-coil
units, are coupled with the condensing units using standard wiring. For dual circuited models,
perform the procedures for each circuit.
NO COOLING
No Cooling ( Compressor Does Not Start )
No Voltage or Low Voltage
Unit Power
Supply
Evaporator
Fan Motor
Fuse For
Operation Circuit
Single-Phase
Components Shorted
Connections Loose
Overcurrent
Relay For
Evaporator Fan
High Volage or Low Voltage
Single-Phase
Evaporator Fan
Contactor
Coil Burnt
Contact Faulty
Get the Right Voltage
Repair the Power Line
Repair or Replace The Components
Tighten The Connections
Get The Right Voltage
Check The Power Supply To The
Motor : Repair When Necessary
Faulty Fan Motor
Defective Operation Switch
Change The Contactor
Repair The Contacts
Repair Or Change The Motor
Repair Or Replace The Switch
Condenser
Fan Motor
Overcurrent
Relay For
Condenser Fan
Condenser Fan
Contactor
Compressor
Contactor
High Voltage or Low Voltage
Single-Phase
Coil Burnt
Contact Faulty
Fan Motor Faulty
Other Electrical Component Faulty
Coil Burnt
Contact Faulty
Open Compressor Windings
Incorrect Wiring
Get The Right Voltage
Change The Contactor
Change The Contacts
Repair or Change The Motor
Repair or Change If Necessary
Change The Contactor
Repair The Contacts
Change The Compressor
Correct The Wiring
Running
Stop
Tripped
Faulty
Faulty
Faulty
Tripped
Blown
Running
Faulty
Stop
: Faulty : Check : Cause Remedy
Check The Power Supply To The
Motor : Repair When Necessary
Page 22
20
INSUFFICIENT COOLING
HIGH DISCHARGE PRESSURE
LOW DISCHARGE PRESSURE
Low Discharge
Pressure
Malfunction Of Fan Cycling
System
Condenser
Air Flow
Low Refrigerant Charge
Low Ambient Temperature
Check The System And Repair The
Components If Required
Add Refrigerant
See The Unit Working Range
Excessive
Insufficient Cooling
High Discharge Pressure or Low
Suction Pressure
Dual Pressure
Switch
Compressor
Cycling
Overcurrent
Relay For
Compressor
Clogged Capillary or Pressure
Switch
Switch Faulty
High Voltage or Low Voltage
Discharge Gas
Thermostat or
Internal
Thermostat
Single-Phase
High Discharge Pressure And
High Suction Pressure
High Discharge Pressure And
Low Suction Pressure
Refrigerant Short Charge or
Refrigerant Leakage
See "High Discharge Pressure" or
"Low Suction Pressure"
Repair Clogging and Replace
The Switch If Required
Repair or Change If Necessary
Get The Right Voltage
Check The Power Line To The
Compressor : Repair When Necessary
High Suction Pressure
High Discharge Pressure or Low
Suction Pressure
See "High Suction Pressure"
Running
Tripping
Cycling On
Tripping
Tripping
Loose Connections
See "High Discharge Pressure"
or "High Suction Pressure"
Tighten The Connections
See "High Discharge Pressure"
or "Low Suction Pressure"
Add Refrigerant. Repair
Leakage If Detected.
See "High Discharge Pressure"
or "Low Suction Pressure"
High Discharge
Pressure
Clogged Condenser Coil
Condenser
Air Inlet
Temperature
Condenser
Air Flow
Low Fan Speed
Malfunction Of Fan Cycling
System
Circulating Air Flow
Overcharged Refrigerant
Non-Condensable Gas
High Suction Pressure
Clean The Condenser
Check The Voltage And Get
The Right Voltage
Check The System And
Repair If Required
Secure Space For
Required Air Flow
Purge The Refrigerant
Restricted
High
Restricted Liquid Line
Purge The Gas
Remove The Restriction
See "High Suction Pressure"
Page 23
21
HIGH SUCTION PRESSURE
LOW SUCTION PRESSURE
NOISY OPERATION
High Suction
Pressure
Excessive Fresh Air Intake
Evaporator
Air Inlet
Temperature
Insufficient Duct Insulation
Defective Compressor Valve
Reduce The Fresh Air Intake
Reinforce The Duct Insulation
Change Or Repair The Compressor
Low
Overcharged Refrigerant Purge The Refrigerant
Low Suction Pressure
Clogged Air Filter
Evaporator
Air Inlet
Temperature
Evaporator
Air Flow
Restricted Duct
Low Fan Speed
Short Cycling
Faulty Thermostat
Restricted Liquid LIne And
Suction Line
Low Discharge Pressure
Clean The Air Filter
Remove The
Restriction
Adjust The Fan Speed
Remove Obstacles To Air Circulation
Repair Or Replace If Necessary
Restricted
Low
Low Refrigerant Charge Add Refrigerant
See "Low Discharge
Pressure"
Remove The Restriction
Noisy Operation
Unremoved Shipping Bolt(s)
Evaporator
Fan
Compressor
Overcharged Refrigerant
Low Suction Pressure
Worn Compressor Parts
Knocking Runner
Worn Bearing
Refrigerant Short Charge
Remove The Bolt(s)
Purge The Refrigerant
See "Low Suction Pressure"
Replace Or Repair The Compressor
Fix The Runner Or Casing Properly
Noisy
Partially Clogged Clean The Dryer
Add Refrigerant
Change The Bearing
Liquid Line
Shipping
Bolt(s)
Liquid
Refrigerant
Backing Up
Noisy
Noisy
Inadequate Duct Work
Loose Fixed Screws Tighten All Fixed Screws
Check Flexible Ducts
Noisy
Strainer
Whistling
Page 24
22
No Cooling / Heating
Unit fail to start
Check power supply
- voltage
- phase
- frequency
Check settings of remote control box
Compressor fails to start
Check circuit breaker & fuse
Check power source cord
Fan fails to start
Fan Motor Capacitor defective
Loose Connections,
Contactors
Irregular motor resistance (W)
& insulation (M W)
Replace Fan Motor
Compressor Motor damaged ( to replace compressor)
Thermostat setting too high
Protection Device Actuated
Reset
Compressor locked (to replace compressor)
Voltage supply not within range
Check motor resistance ( W ) and insulation (M W)
Compressor
Capacitor Defective
Loose Connections,
Improper wiring
Regular but fails
to start
Irregular
For Heat Pump Models
BY MEANS OF PRESSURE READINGS :
PRESSURE PROBABLE CAUSE
Data
Circuit
Too
Low
A Little
Low
Normal
A Little
High
Too
High
High Side
Low Side
=
=
1. Overcharged with refrigerant.
2. Non-condensable gases in refrigerant circuit (e.g. oil).
3. Obstructed air-intake/discharge.
4. Short circuiting of hot air outdoor unit.
High Side
Low Side
=
=
1. Poor compression/no compression (compressor
defective.)
2. Check valve stick in open position.
3. Reversing valve leaking.
High Side
Low Side
=
=
1. Undercharged with refrigerant.
2. Refrigerant leakage.
3. Air filter clogged/dirty (indoor unit).
4. Indoor fan locked.(cooling)
5. Defective defrost control, outdoor coil freezed up
(heating).
6. Outdoor fan locked (heating).
High Side
Low Side
=
=
1. Outdoor fan blocked (cooling).
2. Outdoor coil dirty (cooling).
3. Indoor fan locked (heating).
4. Indoor filter clogged/dirty (heating).
5. Non-condensable gases in refrigerant circuit (e.g. air)
High Side
Low Side
=
=
1. Air intake temperature of indoor unit too high.
BY MEANS OF DIAGNOSIS FLOW CHART
Generally, there are two kinds of problems, i.e. starting failure and insufficient cooling/heating. "Starting
Failure" is caused by electrical defect while "Insufficient Cooling/Heating" is caused by improper
application or defects in refrigerant circuit.
i) Diagnosis of Electric Circuit
Page 25
23
The most common causes of air conditioner failure to “start" are:a) Voltage not within ±10% of rated voltage.
b) Power supply interrupted.
c) Control settings improper.
d) Air conditioner is disconnected from main power source.
e) Fuse blown or circuit breaker off.
II) DIAGNOSIS OF REFRIGERANT CIRCUIT / APPLICATION
There might be some cases where the unit starts running but does not perform satisfactory,
i.e. insufficient cooling. Judgement could be made by measuring temperature difference of
indoor unit's intake and discharge air as well as running current.
Insufficient Cooling
Unit Starts
Excessive heat
source e.g.
electric kettle
High heat load
Refrigerant circuit
Leakage
Restriction e.g. at
strainer, capillary,
filter dryer, etc.
Compressor
Less or no compression
(Low running current)
Room
overcrowded with
people
Windows / doors
wide open
Check air circulation
Indoor/Outdoor coil dirty (clogged)
Air filters dirty
Fan Malfunction
Obstruction at air inlet/outlet of
indoor/outdoor unit
Satisfactory operation with temperature difference of air
intake & discharge of indoor unit 8°C - 13°C
Insufficient Heating
Unit Starts
High heat load
Refrigerant circuit
Leakage
Restriction e.g. at
strainer, capillary,
filter dryer, etc.
Compressor
Less or no compression
(Low running current)
Windows / doors
wide open
Check air circulation
Indoor/Outdoor coil dirty (clogged)
Air filters dirty
Fan Malfunction
Obstruction at air inlet/outlet of
indoor/outdoor unit
Satisfactory operation with temperature difference of air
intake & discharge of indoor unit 14°C - 20°C
Page 26
24
MODEL : A4LC 10/15/20/25B
1. BACK PANEL 16. ROTARY COMPRESSOR
2. TOP PANEL 17. RUBBER GROMMET
3. CONDENSER COIL ASSY. 18. COMPRESSOR NUT
4. FAN MOTOR BRACKET 19. BASE PAN ASSY.
5. FAN MOTOR 20. CAPILLARY TUBE ASSY.
6. FLINGER 21. PARTITION
7. RING WASHER 22. TERMINAL BOX PANEL ASSY.
8. FAN BLADE 23. SIDE PANEL
9. SQUARE WASHER 24. ACCESS PANEL
10. HEX NUT 25. FLARE VALVE MOUNTING PLATE
11. BLACK LABEL 26. SUCTION VALVE (5/8”)
12. FRONT PANEL 27. LIQUID VALVE
13. OUTER NOZZLE
14. SUCTION PIPE ASSY.
15. DISCHARGE PIPE ASSY.
9. PARTS LIST
Page 27
25
MODEL : A4LC 10/15/20/25BR
1. BACK PANEL 16. ROTARY COMPRESSOR
2. TOP PANEL 17. RUBBER GROMMET
3. CONDENSER COIL ASSY. 18. COMPRESSOR NUT
4. FAN MOTOR BRACKET 19. BASE PAN ASSY.
5. FAN MOTOR 20. CAPILLARY TUBE ASSY.
6. FLINGER 21. PARTITION
7. RING WASHER 22. TERMINAL BOX PANEL ASSY.
8. FAN BLADE 23. SIDE PANEL
9. SQUARE WASHER 24. ACCESS PANEL
10. HEX NUT 25. FLARE VALVE MOUNTING PLATE
11. BLACK LABEL 26. SUCTION VALVE (5/8”)
12. FRONT PANEL 27. LIQUID VALVE
13. OUTER NOZZLE 28. DEFROST SENSOR AND CLIP
14. 4-WAY VALVE ASSY.
15. DISCHARGE PIPE ASSY.
Page 28
26
MODEL : A4LC 30/40/50C
1. ASSY. BASE PAN 10. BACK RIGHT PANEL
2. SUCTION VALVE 11. TOP PANEL
3. LIQUID VALVE 12. CONDENSER COIL ASSY.
4. PARTITION PANEL 13. MOTOR BRACKET
5. CRANKCASE HEATER 14. SIDE LEFT PANEL
6. COMPRESSOR ASSY. 15. FAN MOTOR ASSY.
7. SERVICE PANEL 16. FAN BLADE
8. TERMINAL BOARD MAIN ASSY. 17. FRONT PANEL ASSY.
9. ACCUMULATOR
Page 29
27
MODEL : A4LC 30/40/50CR
1. ASSY. BASE PAN 11. 4 WAY VALVE ASSY.
2. SUCTION VALVE 12. BACK RIGHT PANEL
3. LIQUID VALVE 13. DEFROST SENSOR AND CLIP
4. PARTITION PANEL 14. TOP PANEL
5. CRANKCASE HEATER 15. CONDENSER COIL ASSY.
6. COMPRESSOR ASSY. 16. MOTOR BRACKET
7. TXV ASSY. 17. SIDE LEFT PANEL
8. SERVICE PANEL 18. FAN MOTOR ASSY.
9. TERMINAL BOARD MAIN ASSY. 19. FAN BLADE
10. ACCUMULATOR 20. FRONT PANEL ASSY.
Page 30
DOP: 072000
While upmost care is taken in ensuring that all details in the publication are correct at time of going to press, we are constantly striving for
improvement and therefore reserve the rights to alter model specifications and equipment without prior notice. Details of specifications and
equipment are also subject to change to suit local conditions and equirements and not all models are available in every market.
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