Your Climate. We're There.
R407C Air Cooled
Condensing Unit
Models: M4LC
M4LC
M4LC
M4LC
M4LC
M4LC
M4LC
010B/BR
015B/BR
020B/BR
025B/BR
030C/CR
040C/CR
050C/CR
IMPORTANT
This air conditioners use new refrigerant R407C.
Please refer to “Special Precautions” when
dealing with refrigerant R407C unit.
REGISTERED
ISO 9002
TM: R407C – 2250A
Contents
Introduction To Refrigerant R407C .....................................................................................2
Specifications ......................................................................................................................3
Outlines And Dimensions ...............................................................................................4 - 5
Wiring Diagrams ............................................................................................................6 - 9
Special Precautions ...................................................................................................10 - 11
Installation ..................................................................................................................12 - 16
Servicing and Maintenance.........................................................................................17 - 18
Troubleshooting ..........................................................................................................19 - 24
Parts List.....................................................................................................................25 - 28
Note: Installation and maintenance are to be performed only by qualified personnel who are
familiar with local codes and regulations, and experienced with this type of equipment.
Caution: Sharp edges and coil surfaces are a potential injury hazard. Avoid contact with them.
Warning: Moving machinery and electrical power hazards. May cause severe personal injury or
death. Disconnect and lock off power before servicing equipment.
"McQuay" is a registered trademark of McQuay International. All rights reserved throughout the world.
1999 McQuay International
"Bulletin illustrations cover the general appearance of McQuay International products at the time of publication
and we reserve the right to make changes in design and construction at any time without notice."
1
Introduction To Refrigerant R407C
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
Molecular Wt (g/mol)
Vapor Density (kg/m3)
Liquid Density (kg/m3)
Boiling Point (°C)
Latent Heat Vap (kJ/kg)
Ozone Depletion Potential
Global Warming Potential
R407C
86.2
42.0
1134
-37.1 to -44.3
245
0.00
1600
R22
86.5
44.2
1195
-40.8
234
0.05
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.
2
Specifications
Cooling Only
COIL
FIN
PIPE
OUTDOOR UNIT
TUBE
FAN
COMP
MODEL
OUTDOOR UNIT
NOMINAL
COOLING
CAPACITY
REFRIGERANT / CONTROL
POWER SOURCE
COMPRESSOR TYPE
CAPACITOR
RATED RUNNING CURRENT
RATED INPUT POWER
PROTECTION DEVICE
FAN TYPE / DRIVE
BLADE MATERIAL
DIAMETER
RATED RUNNING CURRENT
RATED INPUT POWER
MATERIAL
DIAMETER
THICKNESS
MATERIAL
THICKNESS
ROW
FIN PER INCH
FACE AREA
HEIGHT
DIMENSION
WIDTH
DEPTH
WEIGHT
MATERIAL
CASING
THICKNESS
FINISHING
TYPE
SIZE
LIQUID
GAS
PACKING
HEIGHT
DIMENSION
WIDTH
DEPTH
REFRIGERANT CHARGE
kcal/h
W
Btu/h
V/Ph/Hz
µF
A
W
mm/in
A
W
mm/in
mm/in
mm/in
m2/ft2
mm/in
mm/in
mm/in
kg
mm/in
mm/in
mm/in
mm/in
mm/in
mm/in
kg
M4LC 010B
2,268
2,637
9,000
M4LC 015B
M4LC 020B
M4LC 025B
M4LC 030C
M4LC 040C
M4LC 050C
2,772
4,612
5,292
7,560
9,576
12,600
3,223
5,363
6,155
8,792
11,134
14,650
11,000
18,300
21,000
30,000
38,000
50,000
R407C / CAPILLARY TUBE (OUTDOOR)
R407C / CAPILLARY TUBE (OUTDOOR) + (TXV)
240 / 1 / 50
415 / 3 / 50
ROTARY HERMATIC
SCROLL
30
30
45
50
50
4.00
6.20
9.91
12.50
11.40
6.30
8.20
900
1,350
2,112
2,660
2,560
3,741
4,328
OVERLOAD PROTECTION
PROPELLER / DIRECT
GLASS REINFORCED ACRLY STYRENE RESIN
335 / 14
406 / 16
610 / 24
0.28
0.56
1.09
62
133
241
SEAMLESS COPPER
9.52 / 3/8
0.36 / 0.014
ALUMINIUM (SLIT FIN TYPE)
0.127 / 0.005
1
2
2
1
19
14
16
16
0.32 / 3.50
0.51 / 5.53
0.87 / 9.33
494 / 19.4
646 / 25.4
850 / 33.5
740 / 29.1
840 / 33.1
1,030 / 40.6
270 / 10.6
330 / 13.0
400 / 15.7
31.0
34.0
57.0
58.0
92.5
98.9
115
GALVANIZED MILD STEEL
1.0 ~ 2.3 (0.0393 - 0.0905)
0.8 / 0.031
EPOXY POLYESTER POWDER
FLARE VALVE / AEROQUIP
FLARE VALVE
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
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
1,000 / 39.4
558 / 22.0
710 / 28.0
851 / 33.5
957 / 37.7
1,200 / 47.2
560 / 22.0
401 / 15.8
461 / 18.1
0.78
0.93
1.65
1.65
1.90
3.13
3.15
Heat pump
1)
2)
3)
TUBE
FIN
COIL
PIPE
OUTDOOR UNIT
FAN
COMP
MODEL
OUTDOOR UNIT
NOMINAL
COOLING
CAPACITY
NOMINAL
HEATING
CAPACITY
REFRIGERANT / CONTROL
POWER SOURCE
COMPRESSOR TYPE
CAPACITOR
RATED RUNNING CURRENT (COOLING)
RATED RUNNING CURRENT (HEATING)
RATED INPUT POWER (COOLING)
RATED INPUT POWER (HEATING)
PROTECTION DEVICE
FAN TYPE / DRIVE
BLADE MATERIAL
DIAMETER
RATED RUNNING CURRENT
RATED INPUT POWER
MATERIAL
DIAMETER
THICKNESS
MATERIAL
THICKNESS
ROW
FIN PER INCH
FACE AREA
HEIGHT
DIMENSION
WIDTH
DEPTH
WEIGHT
MATERIAL
CASING
THICKNESS
FINISHING
TYPE
SIZE
LIQUID
GAS
PACKING
HEIGHT
DIMENSION
WIDTH
DEPTH
REFRIGERANT CHARGE
kcal/h
W
Btu/h
kcal/h
W
Btu/h
V/Ph/Hz
µF
A
A
W
W
mm/in
A
W
mm/in
mm/in
mm/in
2
2
m /ft
mm/in
mm/in
mm/in
kg
mm/in
mm/in
mm/in
mm/in
mm/in
mm/in
kg
M4LC 010BR
2,268
2,637
9,000
2,394
2,784
9,500
M4LC 015BR
M4LC 020BR
M4LC 025BR
M4LC 030CR
M4LC 040CR
M4LC 050CR
2,772
4,536
5,170
7,310
9,830
12,100
3,223
5,274
6,008
8,499
11,430
14,068
11,000
18,000
20,500
29,000
39,000
48,000
3,150
4,790
6,050
7,812
10,332
12,600
3,663
5,569
7,034
9,083
12,013
14,654
12,500
19,000
24,000
31,000
41,000
50,000
R407C / CAPILLARY TUBE (OUTDOOR)
R407C / CAPILLARY TUBE (OUTDOOR) + (TXV)
240 / 1 / 50
415 / 3 / 50
ROTARY HERMATIC
SCROLL
30
30
45
50
50
NIL
NIL
4.00
6.20
9.50
12.60
11.50
6.20
8.80
3.30
5.70
10.10
12.50
11.40
5.90
7.80
900
1,350
2,002
2,571
2,424
3,565
4,615
750
1,200
2,096
2,549
2,407
3,280
3,734
OVERLOAD PROTECTION
PROPELLER / DIRECT
GLASS REINFORCED ACRLY STYRENE RESIN
335 / 14
406 / 16
610 / 24
0.28
0.56
1.09
62
133
241
SEAMLESS COPPER
9.52 / 3/8
0.36 / 0.014
ALUMINIUM (SLIT FIN TYPE)
0.127 / 0.005
1
2
2
19
14
16
0.32 / 3.50
0.51 / 5.53
0.77 / 8.29
0.56 / 6.00
494 / 19.4
646 / 25.4
960 / 37.80
772 / 30.40
740 / 29.1
840 / 33.1
1,095 / 43.10
991 / 39.00
270 / 10.6
330 / 13.0
437 / 17.20
400 / 15.75
31.0
34.0
57.0
58.0
92.5
98.9
115.0
GALVANIZED MILD STEEL
0.8 / 0.031
1.0 - 2.3 ( 0.0393 - 0.0905 )
EPOXY POLYESTER POWDER
FLARE VALVE / AEROQUIP
FLARE VALVE
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
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
558 / 22.0
710 / 28.0
1,016 / 40.0
851 / 33.5
957 / 37.7
1,207 / 47.5
401 / 15.8
461 / 18.1
559 / 22.0
0.98
1.00
1.70
1.65
2.35
3.10
3.35
ALL SPECIFICATIONS ARE SUBJECTED TO CHANGE BY THE MANUFACTURER WITHOUT PRIOR NOTICE.
ALL UNITS ARE BEING TESTED AND COMPLY TO ARI 210/240-89.
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.
3
Outlines And Dimensions
Model : M4LC 010B/015B, 010BR/015BR
All dimensions in mm
Model : M4LC 030/040/050C, M4LC 030/040/050CR
All dimensions in mm
4
MODEL : M4LC 030/040/050C, M4LC 030/040/050CR
All dimensions in mm
Caution
Sharp edges and coil surfaces may cause injury. Wear protective
gloves when handling the unit.
5
Wiring Diagrams
Model : M4LC 010B/015B
Model : M4LC 010BR/015BR
6
Model : M4LC 020B/025B
Model : M4LC 020BR/025BR
7
Model : M4LC 030C
Model : M4LC 030CR
8
Model : M4LC 040C/050C
Model : M4LC 040CR/050CR
9
Special precautions when dealing with
refrigerant R407C unit
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 dop. 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.
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.
R32/R125/R134
33% / 33% / 34%
23% / 25% / 52%
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.
Invert cylinder
without dip-pipe
Dip-pipe
Liquid
withdrawal
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.
11
Installation
Caution
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.
12
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)
A
B
C
D
Series I
Minimum Distance
150 mm
1,000 mm
150 mm
500 mm
Series II
300 mm
1,000 mm
300 mm
500 mm
(3) Refrigerant piping
Caution
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
Max. Length (m)
Max. Elevation (m)
Max. No of Bends
10
15
20
25
30
40
50
7
5
10
10
5
10
15
8
10
15
8
10
20
10
10
20
10
10
20
10
10
Piping sizes (flare connection type)
•
Piping sizes are as follows :
MODELS
Liquid (mm/in)
Suction (mm/in)
10
15
20
25
30
40
50
6.35 (1/4)
9.52 (3/8)
6.35 (1/4)
12.70 (1/2)
6.35 (1/4)
15.88 (5/8)
9.52 (3/8)
15.88 (5/8)
9.52 (3/8)
15.88 (5/8)
9.52 (3/8)
19.05 (3/4)
9.52 (3/8)
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)
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
TORQUE (Nm)
18
42
55
65
78
13
(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
14
Caution
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.
Caution
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
10
15
20
25
30
40
50
7m
40
40
40
80
90
90
90
10m
100
100
100
200
225
225
225
15
15m
200
200
200
400
450
450
450
20m
675
675
675
Caution
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
Minimum indoor temperature
Maximum indoor temperature
Minimum outdoor temperature
Maximum outdoor temperature
Ts °C
19.4
26.7
19.4
46.0
Th °C
13.9
19.4
13.9
24.0
Ts °C
10.0
26.7
-8.0
24.0
Th °C
-9.0
18.0
HEAT PUMP UNIT
Temperature
Minimum indoor temperature
Maximum indoor temperature
Minimum outdoor temperature
Maximum outdoor temperature
Ts : Dry bulb temperature
Th : Wet bulb temperature
16
Servicing And Maintenance
Caution
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
Air Filters
(Indoor unit)
Maintenance Procedure
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.
Recommended Schedule
Every 2 weeks.
More frequently if required.
2. Rinse well to dry before re-installing.
3. Note : Never use petrol, thinner,
benzene or any other chemicals.
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.
Every 2 weeks.
More frequently if required.
2. Note: Never use petrol, thinner, benzene
or any other volatile chemicals, which
may cause plastic surface to deform.
Condensate Drain
1. Check and clean.
Every 3 months.
2. Check for unusual noise.
As necessary.
Pan & Pipe
Indoor Fan
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.
Electrical
Every month.
Every month.
1. Check voltage, current and wiring.
Every 2 months.
2. Check faulty contacts caused by loose
connections, foreign matters, etc.
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.
17
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.
18
Troubleshooting
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 • Protection against the frequent starting. Wait 3 or 4 minutes.
after starting
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
deficient
control
light
is • The batteries are discharge.
• The batteries are not correctly inserted.
• The assembly is not good.
5. Air discharge flow has a bad • This odor can be caused by cigarette smoke particles, perfume,
odor
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 • This is due to air humidity after a long time of operation.
indoor unit
• The unit has a lower temperature point, increase the point and
operate at high speed.
7. The water flow of air conditioning • Check the condensate evacuation.
unit
8. The air conditioning unit are • <<Air flow noise>> : refrigerant fluid admission in evaporator.
noisy
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
: Check
: Faulty
: Cause
Remedy
No Cooling ( Compressor Does Not Start )
Evaporator
Fan Motor
Stop
Unit Power
Supply
Running
Faulty
Fuse For
Operation
Circuit
Blown
Overcurrent
Relay For
Evaporator Fan
Tripped
Evaporator Fan
Contactor
No Voltage or Low Voltage
Get the Right Voltage
Single-Phase
Repair the Power Line
Components Shorted
Connections Loose
High Volage or Low Voltage
Single-Phase
Faulty
Coil Burnt
Contact Faulty
Faulty Fan Motor
Defective Operation Switch
Condenser
Fan Motor
Repair or Replace The Components
Tighten The Connections
Get The Right Voltage
Check The Power Supply To The
Motor : Repair When Necessary
Change The Contactor
Repair The Contacts
Repair Or Change The Motor
Repair Or Replace The Switch
Stop
Overcurrent
Relay For
Condenser Fan
Tripped
High Voltage or Low Voltage
Single-Phase
Get The Right Voltage
Check The Power Supply To The
Motor : Repair When Necessary
Running
Condenser Fan
Contactor
Faulty
Coil Burnt
Contact Faulty
Fan Motor Faulty
Other Electrical Component Faulty
Compressor
Contactor
Faulty
Coil Burnt
Contact Faulty
Open Compressor Windings
Incorrect Wiring
20
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
Insufficient Cooling
Insufficient Cooling
Compressor
Cycling
Cycling On
Dual Pressure
Switch
Tripping
High Discharge Pressure or Low
Suction Pressure
Clogged Capillary or Pressure
Switch
Switch Faulty
Running
Overcurrent
Relay For
Compressor
Tripping
High Voltage or Low Voltage
Single-Phase
High Discharge Pressure And
High Suction Pressure
Loose Connections
Discharge Gas
Thermostat or
Internal
Thermostat
Tripping
High Discharge Pressure And
Low Suction Pressure
Refrigerant Short Charge or
Refrigerant Leakage
High Suction Pressure
High Discharge Pressure or Low
Suction Pressure
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
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 Suction Pressure"
See "High Discharge Pressure"
or "Low Suction Pressure"
High Discharge Pressure
High Discharge
Pressure
Restricted
Condenser
Air Flow
Clogged Condenser Coil
Low Fan Speed
Condenser
Air Inlet
Temperature
High
Malfunction Of Fan Cycling
System
Circulating Air Flow
Overcharged Refrigerant
Non-Condensable Gas
Restricted Liquid Line
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
Purge The Gas
Remove The Restriction
See "High Suction Pressure"
Low Discharge Pressure
Low Discharge
Pressure
Condenser
Air Flow
Excessive
Malfunction Of Fan Cycling
System
Low Refrigerant Charge
Low Ambient Temperature
21
Check The System And Repair The
Components If Required
Add Refrigerant
See The Unit Working Range
High Suction Pressure
High Suction
Pressure
Low
Evaporator
Air Inlet
Temperature
Excessive Fresh Air Intake
Reduce The Fresh Air Intake
Insufficient Duct Insulation
Reinforce The Duct Insulation
Defective Compressor Valve
Overcharged Refrigerant
Change Or Repair The Compressor
Purge The Refrigerant
Low Suction Pressure
Low Suction Pressure
Evaporator
Air Flow
Restricted
Evaporator
Air Inlet
Temperature
Clogged Air Filter
Low
Clean The Air Filter
Restricted Duct
Remove The
Restriction
Low Fan Speed
Adjust The Fan Speed
Short Cycling
Faulty Thermostat
Restricted Liquid LIne And
Suction Line
Remove Obstacles To Air Circulation
Repair Or Replace If Necessary
Remove The Restriction
Low Refrigerant Charge
Add Refrigerant
Low Discharge Pressure
See "Low Discharge
Pressure"
Noisy Operation
Noisy Operation
Compressor
Noisy
Shipping
Bolt(s)
Noisy
Unremoved Shipping Bolt(s)
Overcharged Refrigerant
Liquid
Refrigerant
Backing Up
Low Suction Pressure
Worn Compressor Parts
Evaporator
Fan
Liquid Line
Noisy
Knocking Runner
Noisy
Strainer
Whistling
Worn Bearing
Remove The Bolt(s)
Purge The Refrigerant
See "Low Suction Pressure"
Replace Or Repair The Compressor
Fix The Runner Or Casing Properly
Change The Bearing
Partially Clogged
Clean The Dryer
Refrigerant Short Charge
Add Refrigerant
Loose Fixed Screws
Inadequate Duct Work
22
Tighten All Fixed Screws
Check Flexible Ducts
For Heat Pump Models
By means of pressure readings :
Pressure
Probable Cause
High Side
Low Side
1.
2.
3.
4.
=
=
High Side
Low Side
High Side
Low Side
Too
High
A Little High
Normal
Circuit
A Little Low
Too
Low
Data
1. Poor compression/no compression (compressor defective.)
2. Check valve stick in open position.
3. Reversing valve leaking.
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).
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)
1. Air intake temperature of indoor unit too high.
=
=
=
=
=
High Side
Low Side
=
=
High Side
Low Side
Overcharged with refrigerant.
Non-condensable gases in refrigerant circuit (e.g. oil).
Obstructed air-intake/discharge.
Short circuiting of hot air outdoor unit.
=
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
No Cooling / Heating
Unit fail to start
Check power supply
- voltage
- phase
- frequency
Check settings of remote control box
Check power source cord
Check circuit breaker & fuse
Fan fails to start
Compressor fails to start
Fan Motor Capacitor defective
Loose Connections,
Contactors
Irregular motor resistance (Ω)
& insulation (M Ω)
Thermostat setting too high
Protection Device Actuated
Voltage supply not within range
Loose Connections,
Improper wiring
Compressor
Capacitor Defective
Reset
Check motor resistance (Ω ) and insulation (MΩ)
Replace Fan Motor
Regular but fails
to start
Irregular
Compressor locked (to replace compressor)
Compressor Motor damaged ( to replace compressor)
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. Judgment could be made by measuring temperature difference of indoor unit's intake and discharge
air as well as running current.
Insufficient Cooling
Unit Starts
Check air circulation
High cooling load
Refrigerant circuit
Indoor/Outdoor coil dirty (clogged)
Air filters dirty
Fan Malfunction
Leakage
Excessive heat
source e.g.
electric kettle
Restriction e.g. at
strainer, capillary,
filter dryer, etc.
Room
overcrowded with
people
Compressor
Windows / doors
wide open
Obstruction at air inlet/outlet of
indoor/outdoor unit
Less or no compression
(Low running current)
Satisfactory operation with temperature difference of air
intake & discharge of indoor unit 8°C - 13°C
Insufficient Heating
Unit Starts
Check air circulation
High heating load
Refrigerant circuit
Indoor/Outdoor coil dirty (clogged)
Leakage
Air filters dirty
Restriction e.g. at
strainer, capillary,
filter dryer, etc.
Fan Malfunction
Compressor
Obstruction at air inlet/outlet of
indoor/outdoor unit
Less or no compression
(Low running current)
Satisfactory operation with temperature difference of air
intake & discharge of indoor unit 14°C - 20°C
24
Windows / doors
wide open
Parts List
Model : M4LC 010B/015B/020B/025B
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.
25
Model : M4LC 010BR/015BR/020BR/025BR
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.
26
Model : M4LC 030C/040C/050C
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
27
Model : M4LC 030CR/040CR/050CR
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.
28
DOP: 042000
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