Catalog 2110B
Ceiling And Floor Convertible
Fan Coil Unit
Models: MCM 020D/DR
MCM 025D/DR
MCM 030D/DR
MCM 040D/DR
MCM 050D/DR
Contents
Special Features ................................................................................................................ 2
Specifications ................................................................................................................ 3 - 4
Outlines and Dimensions............................................................................................... 5 - 7
Wiring Diagrams ......................................................................................................... 8 - 16
Installation ................................................................................................................ 17 - 25
Servicing And Maintenance ....................................................................................... 26 - 27
Trouble Shooting ...................................................................................................... 28 - 33
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 hazard. 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.
1998 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
Special features
Ultra Slim New Stylish Design Profile
This unit is contemporary in design and match even the most up to date interior decor. The slim, round
profile and compact design of this unit adds a touch of elegance to every decor. No indoor connection pipe
and hanger bracket are visible.
Ceiling And Floor Convertible With Space Saving Installation
This unit is designed for ceiling exposed type and floor exposed type with a very economical and space
saving installation. No need renovation to wall or ceiling for ceiling exposed and no foundation work is
required for floor exposed installation. This easy to install and ready to operate unit ensure rapid and low
installation cost.
Strong And Robust
The unit is built from strong casing material and robust parts to ensure long lasting reliable service. The
drain pan is made from the POLYSTYRENE with a plastic coating on the surface to ensure no leaking and
no condensation occur.
Friendly Serviceability
The air filter, electrical parts, fan and fan motor assembly can all be inspected and replace from bottom of
the unit by simply removing the newly designed press in, pull out air intake grille. The POLYSTYRENE drain
pan and the heat exchanger coils can remove from the unit easily by remove the bottom panel.
Microcomputer Remote Controller
The incorporated microprocessor give more accurate control and with the following extra features:
•
Fan motor speed can be set at high/medium/low and automatic.
•
Timer on/off - the unit can be pre-set to on and off automatically.
•
Electronic thermostat - room temperature is precisely controlled resulting in energy saving and increase
comfort.
•
Sleep mode automatically increase set temperature since room temperature is lower at night thus
achieving healthy sleep.
Wireless Remote Controller
The compact wireless remote controller makes it possible to operate the air conditioner anywhere within the
room.
Auto Or Manual Control On Vertical Airflow Direction
With auto control, the louver will automatically swing up and down to create an excellent air distribution. You
can select your desired horizontal air flow direction by adjusting the vertical grille.
2
Specifications
Cooling only
MODEL
INDOOR UNIT
OUTDOOR UNIT
COIL
FIN
INDOOR UNIT
COMP.
MCM050D
MMC050B
MLC050C
12,600
12,600
14,654
14,654
50,000
50,000
1,120 / 31.8
4 POLES X 145W
240
1.04
S.B.C
740 / 21.0
4 POLES X 95W
132
0.58
S.I.G.C
1,120 / 31.8
4 POLES X 145W
240
1.04
S.I.G.C
9.52 / 3/8
0.35 / 0.014
ALUMINIUM
ALUMINIUM (HYDROPHILIC TYPE)
0.11 / 0.0043
4
4
3
12
12
12
0.36 / 3.95
0.36 / 3.95
0.24 / 2.58
249 / 9.80
249 / 9.80
249 / 9.80
1,714 / 67.40
1,714 / 67.40
1,214 / 47.80
670 / 26.30
670 / 26.30
670 / 26.30
70
70
45
MICROCOMPUTER CONTROLLED THERMOSTAT
AUTOMATIC LOUVER (UP&DOWN) & MANUAL LOUVER (BOTTOM)
LCD WIRELESS MICROCOMPUTER REMOTE CONTROL
19.05 / 3/4
WASHABLE SARAN NET (OPTIONAL IONIZER FILTER)
301 / 11.9
345 / 13.6
345 / 13.6
1,311 / 51.6
1,816 / 71.4
1,361 / 53.5
760 / 29.9
760 / 29.9
760 / 29.9
220 - 240 / 1 / 50
380 - 420 / 3 / 50
ROTARY HERMETIC
RECIPROCATING HERMETIC
35
45
45
45
62
47
59
85
6.3 / 5.8
8.2 / 8.3
9.9
12.5
13.9
2,073
2,761
2,809
3,780
3,486
4,500
4,943
3
12
0.19 / 2.06
214 / 8.42
1,214 / 47.80
670 / 26.30
43
3
12
0.19 / 2.06
214 / 8.42
1,214 / 47.80
670 / 26.30
43
OVERLOAD PROTECTION
OVERLOAD PROTECTION AND MANUAL RESET HIGH/LOW PRESSURE SWITCH
PROPELLER / DIRECT
GLASS REINFORCED ACRYL STYRENE RESIN
355.6 / 14.0
355.6 / 14.0
609.6 / 24.0
2 x 0.28
2 x 0.28
1.09
2 x 30
2 x 30
145
124
124
241
S.B.C
9.52 / 3/8
420.0 / 16.5
0.56
55
133
S.B.C
S.I.G.C
0.35 / 0.014
0.36 / 0.014 AVERAGE
609.6 / 24.0
1.09
145
241
3
14
0.77 / 8.29
1094 / 43.07
960 / 37.79
437 / 17.20
112
2
16
0.87 / 9.33
850 / 33.46
1029 / 40.53
400 / 15.75
105
9.52 / 3/8
19.05 / 3/4
1,000 / 39.37
1,265 / 49.80
1,200 / 47.24
1,084 / 42.68
560 / 22.05
641 / 25.24
1,000 / 39.37
1,200 / 47.24
560 / 22.05
ALUMINIUM
0.127 / 0.005
3
2
14
14
0.55 / 6.00
0.77 / 8.29
991 / 39.00
1094 / 43.07
772 / 30.40
960 / 37.79
400 / 15.75
437 / 17.20
90
95
GALVANISED MILD STEEL
0.8 / 0.031
POLYESTER POWDER
FLARE VALVE
2
14
0.51 / 5.53
646 / 25.40
840 / 33.10
330 / 13.00
57
406.4 / 16.0
2 x 0.78
2 x 80
341
0.35 / 0.014
ALUMINIUM (SLIT TYPE)
58
9.52 / 3/8
15.88 / 5/8
6.35 / 1/4
15.88 / 5/8
710 / 27.95
957 / 37.68
461 / 18.15
1,183 / 46.57
904 / 35.59
588 / 23.15
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
Abbreviation
S.B.C.
S.I.G.C -
MCM040D
MMC040B
MLC040C
10,080
10,080
11,723
11,723
40,000
40,000
220 - 240 / 1 / 50
R22 / CAPILLARY TUBE IN INDOOR
680 / 19.3
4 POLES X 95W
130
0.58
S.B.C
FIN
TUBE
MCM030D
MMC030A
7,560
8,792
30,000
R22 / CAPILLARY TUBE IN OUTDOOR
FAN
COIL
OUTDOOR UNIT
PIPE
MCM025D
MLC025B
6,300
7,327
25,000
590 / 16.7
4 POLES X 45W
96
0.40
TUBE
FAN
NOMINAL
kcal/h
COOLING
W
CAPACITY
Btu/h
POWER SOURCE
V/Ph/Hz
REFRIGERANT / CONTROL
AIR FLOW
cfm/cmm
FAN MOTOR
RATED INPUT POWER
W
RATED RUNNING CURRENT
A
MATERIAL
DIAMETER
mm/in
THICKNESS
mm/in
MATERIAL
THICKNESS
mm/in
ROW
FIN PER INCH
FACE AREA
m2/ft2
HEIGHT
mm/in
DIMENSION
WIDTH
mm/in
DEPTH
mm/in
WEIGHT
kg
ROOM TEMPERATURE
CONTROL
AIR DISCHARGE
OPERATION
CONDENSATE DRAIN SIZE
mm/in
AIR FILTER
PACKING
HEIGHT
mm/in
DIMENSION
WIDTH
mm/in
DEPTH
mm/in
POWER SOURCE
V/Ph/Hz
COMPRESSOR TYPE
CAPACITOR
µF
LOCK ROTOR AMP.
A
RATED RUNNING CURRENT
A
RATED INPUT POWER
W
PROTECTION DEVICE
FAN TYPE / DRIVE
BLADE MATERIAL
DIAMETER
mm/in
RATED RUNNING CURRENT
A
RATED OUTPUT POWER
W
RATED INPUT POWER
W
MATERIAL
DIAMETER
mm/in
THICKNESS
mm/in
MATERIAL
THICKNESS
mm/in
ROW
FIN PER INCH
FACE AREA
m2/ft2
HEIGHT
mm/in
DIMENSION
WIDTH
mm/in
DEPTH
mm/in
WEIGHT
kg
MATERIAL
CASING
THICKNESS
mm/in
FINISHING
TYPE
SIZE
LIQUID
mm/in
GAS
mm/in
PACKING
HEIGHT
mm/in
DIMENSION
WIDTH
mm/in
DEPTH
mm/in
MCM020D
MLC020B
5,040
5,862
20,000
SEAMLESS BARE COPPER
SEAMLESS INNER GROOVE COPPER
3
1,265 / 49.80
1,084 / 42.68
641 / 25.24
2
16
0.87 / 9.33
850 / 33.46
1029 / 40.53
400 / 15.75
100
Heat Pump
MODEL
INDOOR UNIT
OUTDOOR UNIT
COIL
TUBE
COIL
FIN
PIPE
OUTDOOR UNIT
FAN
COMP
INDOOR UNIT
FIN
TUBE
FAN
NOMINAL
COOLING
CAPACITY
NOMINAL
HEATING
CAPACITY
POWER SOURCE
REFRIGERANT / CONTROL
AIR FLOW
FAN MOTOR
RATED INPUT POWER
RATED RUNNING CURRENT
MATERIAL
DIAMETER
THICKNESS
MATERIAL
THICKNESS
ROW
FIN PER INCH
FACE AREA
HEIGHT
DIMENSION
WIDTH
DEPTH
WEIGHT
ROOM TEMPERATURE
CONTROL
AIR DISCHARGE
OPERATION
CONDENSATE DRAIN SIZE
AIR FILTER
PACKING
HEIGHT
DIMENSION
WIDTH
DEPTH
POWER SOURCE
COMPRESSOR TYPE
CAPACITOR
LOCK ROTOR AMP.
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 OUTPUT POWER
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
kcal/h
W
Btu/h
kcal/h
W
Btu/h
V/Ph/Hz
MCM020DR
MLC020BR
5,040
5,862
20,000
5,292
6,155
21,000
MCM025DR
MLC025BR
6,048
7,034
24,000
6,300
7,327
25,000
R22 / CAPILLARY TUBE IN OUTDOOR
cfm/cmm
W
A
590 / 16.7
4 POLES X 45W
96
0.40
MCM040DR
MLC040CR
10,080
11,723
40,000
10,332
12,016
41,000
MCM050DR
MLC050CR
12,096
14,068
48,000
12,096
14,068
48,000
R22 / CAPILLARY TUBE & TXV IN OUTDOOR
680 / 19.3
4 POLES X 95W
130
0.58
S.B.C
mm/in
mm/in
740 / 21.0
4 POLES X 95W
132
0.58
S.I.G.C
9.52 / 3/8
0.35 / 0.014
1,120 / 31.8
4 POLES X 145W
240
1.04
S.B.C
1,120 / 31.8
4 POLES X 145W
240
1.04
S.I.G.C
ALUMINIUM
mm/in
m 2/ft2
mm/in
mm/in
mm/in
kg
mm/in
mm/in
mm/in
mm/in
V/Ph/Hz
µF
A
A
A
W
W
ALUMINIUM (HYDROPHILIC TYPE)
0.11 / 0.0043
3
3
3
4
4
12
12
12
12
12
0.19 / 2.06
0.19 / 2.06
0.24 / 2.58
0.36 3.95
0.36 3.95
214 / 8.42
214 / 8.42
249 / 9.80
249 / 9.80
249 / 9.80
1,214 / 47.80
1,214 / 47.80
1,214 / 47.80
1,714 / 67.40
1,714 / 67.40
670 / 26.30
670 / 26.30
670 / 26.30
670 / 26.30
670 / 26.30
43
43
45
70
70
MICROCOMPUTER CONTROLLED THERMOSTAT
AUTOMATIC LOUVER (UP&DOWN) & MANUAL LOUVER (BOTTOM)
LCD WIRELESS MICROCOMPUTER REMOTE CONTROL
19.05 / 3/4
WASHABLE SARAN NET (OPTIONAL IONIZER FILTER)
301 / 11.9
345 / 13.6
345 / 13.6
1,311 / 51.6
1,816 / 71.4
1,361 / 53.5
760 / 29.9
760 / 29.9
760 / 29.9
220 - 240 / 1 / 50
380 - 420 / 3 / 50
ROTARY HERMETIC
RECIPROCATING HERMETIC
35
45
45
49.0
56.5
78.0
45.0
62.0
11.0
13.3
13.4
6.0
7.6
9.7
13.6
12.9
5.4
7.0
2,040
2,667
2,643
3,431
4,480
2,140
2,757
2,562
2,921
3,902
OVERLOAD PROTECTION
420.0 / 16.5
0.56
55
133
mm/in
A
W
W
mm/in
mm/in
OVERLOAD PROTECTION AND MANUAL RESET HIGH/LOW PRESSURE SWITCH
PROPELLER / DIRECT
GLASS REINFORCED ACRYL STYRENE RESIN
609.6 / 24.0
1.09
1.09
145
145
241
241
S.B.C
9.52 / 3/8
S.B.C
S.I.G.C
0.35 / 0.014
0.36 / 0.014 AVERAGE
0.35 / 0.014
ALUMINIUM (SLIT TYPE)
m 2/ft2
mm/in
mm/in
mm/in
kg
0.35 / 0.014
0.35 / 0.014
ALUMINIUM
2
14
0.51 / 5.53
646 / 25.40
840 / 33.10
330 / 13.00
57
58
mm/in
mm/in
mm/in
mm/in
mm/in
mm/in
2.7
460
635
0.127 / 0.005
mm/in
6.35 / 1/4
15.88 / 5/8
710 / 27.95
957 / 37.68
461 / 18.15
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
Abbreviation
S.B.C.
S.I.G.C
-
MCM030DR
MLC030CR
7,560
8,792
30,000
8,064
9,379
32,000
220 - 240 / 1 / 50
SEAMLESS BARE COPPER
SEAMLESS INNER GROOVE COPPER
4
98
GALVANISED MILD STEEL
0.8 / 0.031
POLYESTER POWDER
FLARE VALVE
9.52 / 3/8
15.88 / 5/8
2
16
0.87 / 9.33
850 / 33.46
1029 / 40.53
400 / 15.75
110
115
9.52 / 3/8
19.05 / 3/4
1,000 / 39.37
1,200 / 47.24
560 / 22.05
Outlines and dimensions
Indoor Unit
Model: MCM - D SERIES
(Cooling only and heat pump)
MODEL
A
B
C
D
E
F
G
H
I
J
K
L
M
MCM 020D/DR
1174
75
1082
68
58
156
1214
57
670
216
319
879
517
MCM 025D/DR
1174
75
1082
68
58
156
1214
57
670
216
319
879
517
MCM 030D/DR
1174
75
1082
68
93
156
1214
57
670
216
319
879
517
All dimensions in mm
5
MCM 040D/DR
1674
75
1582
68
93
156
1714
57
670
216
319
1379
517
MCM 050D/DR
1674
75
1582
68
93
156
1714
57
670
216
319
1379
517
Outdoor unit
Model: MLC - B SERIES
MODEL
A
MLC 020B / BR 840
MLC 025B / BR 840
B
646
646
C
330
330
D
297
297
E
309
309
F
626
626
G
46
46
H
90
90
J
64
64
K
177
177
L
106
106
M
408
408
N
378
378
P
124
124
Q
R
492 78.5
492 78.5
All dimensions in mm
Model: MMC SERIES
MODEL
MMC 030A
MMC 040B
MMC 050B
A
772
960
960
B
991
1095
1095
C
400
437
437
D
414
470
470
E
492
622
622
F
280
338
338
G
25
20
20
All dimensions in mm
6
H
284
305
305
I
441
492
492
J
240
277
277
K
127
106
106
L
518
748
748
M
127
106
106
Model : MLC 040/050C, MLC 030/040/050CR
Caution Sharp edges and coil surfaces are potential locations which may cause injury
hazards. Avoid from being in contact with these places.
7
Wiring diagrams
Model : MCM 020/025D - MLC 020/025B
8
Model: MCM 030D - MLC 030C
9
Model: MCM 030D - MMC 030A
10
Model : MCM 040D/050D - MLC 040C/050C
11
Model: MCM 040D - MMC 040B
12
Model: MCM 050D - MMC 050B
13
Model: MCM 020DR - MLC 020BR
MCM 025DR - MLC 025BR
14
Model: MCM 030DR - MLC 030CR
15
Model: MCM 040DR - MLC 040CR
MCM 050DR - MLC 050CR
16
Installation
Caution
Sharp edges and coil surface are potential injury hazard. Avoid from contact with them.
(1) INSTALLATION OF INDOOR UNIT
Preliminary Site Survey
• Electrical supply and installation shall conform to the local authority (eg. National Electrical Board).
• Voltage supply fluctuation must not exceed ±10% of the rated voltage. Electricity supply lines must be
independent of welding transformers which can cause high supply fluctuation.
• Ensure that the installation location is convenient for wiring and piping.
Standard Mounting
Ensure that the overhead supports are strong enough to hold the weight of the unit. Position the hanger rods
(wall mounting bracket for floor standing), and check for its alignment with the unit as shown in Figure A.
Also, check that the hangers are secured and the base of the fan coil unit is leveled in both horizontal
directions, taking into account the gradient for drainage flow as recommended in Figure B.
Model MCM 020D/DR MCM025D/DR MCM030D/DR MCM040D/DR MCM050D/DR
A
1214
1214
1214
1714
1714
B
666
666
666
666
666
C
273
273
273
273
273
D
130
130
130
130
130
F
1160
1160
1560
1560
1560
G
27
27
27
27
27
H
77
77
77
77
77
I
745
745
745
1235
1235
J
25
25
25
25
25
K
209
209
209
331
331
L
486
486
486
486
486
M
108
108
108
108
108
N
360
360
360
600
600
O
770
770
770
1270
1270
P
136
136
136
136
136
Q
373
373
373
373
373
R
222
222
222
310
310
Note : Dimensions in mm
Figure A
Figure B
17
Please ensure that the following steps are taken:
• Cheek the gradient for drainage flow as recommended in Figure B.
• Provide clearance for easy servicing and optimal air flow as shown in Figure B.
• The indoor unit must be installed such that there is no short circuit of the cool discharge air with the warm
return air.
• Do not install the indoor unit where there is direct sunlight shining on the unit. The location should be
suitable for piping and drainage installation. The unit must be a large distance away from the door.
Semi-Enclose Mounting
•
In case the units is to be half recessed into false ceiling, please check the unit is well align.
Figure C
•
Provide the installation space as shown in Fig. D.
Figure D
18
Installation - Ceiling Exposed Type
STEP 1
Remove air intake grille, side panel, side close-up and hanger bracket from the unit; see Fig E.
Figure E
STEP 2
Position the hanger rods as per Fig B and install the hanger bracket; see Fig F.
Figure F
STEP 3
Hanger up the unit and tighten the bolt, after completed the piping and drain pipe; install back the grille and
panel Fig. G.
Figure G
19
Installation - Floor Standing Type
STEP 1
Remove air intake grille, side panel, side close-up and side panel from the unit; see Fig E.
STEP 2
Position the floor support and wall mounting bracket as per Fig B. install the unit; see Fig 1.
* Wall mounting bracket
will be supplied upon
request.
Fig I
STEP 3
Two type of piping and drain pipe connection as Fig J.
Piping and drain pipe installation
Fig J
20
(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 fulfil the following requirements:-
•
•
•
•
•
•
Install the condensing (outdoor) unit in away 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 are no obstruction of air flow into or out of the unit. Remove obstacles which 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.
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).
MLC SERIES
Minimum Distance
Series I
Series II
A
150mm
300mm
B
1000mm
1000mm
21
C
150mm
300mm
D
500mm
500mm
MMC SERIES
ALL MODELS
Minimum Distance
A
300mm
B
1000mm
C
300mm
(3) Refrigerant Piping
Maximum Pipe Length And Maximum Number Of Bends
•
When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends
increases, system piping resistance to the refrigerant flow increases, thus lowering the cooling capacity,
and as the result the
MODEL
DATA
Max. Length, L
Max. Elevation, H
Max. No. of bends
020
025
030
040
050
15m
8m
10
15m
8m
10
20m
10m
10
20m
10m
10
20m
10m
10
compressor may become defective. Always choose the shortest path and follow the recommendation as tabulated
below:
MODEL
Liquid (mm/in)
Suction (mm/in)
020
6.35(1/4)
15.88(5/8)
025
9.52(3/8)
15.88 (5/8)
030
9.52(3/8)
15.88 (5/8)
040
9.52(3/8)
19.05 (3/4)
050
9.52(3/8)
19.05 (3/4)
Piping Sizes (Flare Connection Type)
•
Piping sizes are as follows:
Piping Connection To The Units
•
•
•
Align the center 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)
9.53(3/8)
12.7(1/2)
15.88(5/8)
9.05(3/4)
TORQUE (Nm)
18
42
55
65
78
22
(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 precharged 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 the R22 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.
(evacuation time varies by the capacity of the pump but averagely in 1 hour).
Diagram 1
4) After evacuation, unscrew the spindle (diagram 2B) for the gas to run to indoor unit.
Diagram 2
23
(6) Additional Charge
• The refrigerant gas has already charged into the outdoor unit. For the piping length of 5m. Additional refrigerant
charge after vacuuming is not necessary.
• When the piping length is more than 5m, please use the table below (unit in gram).
MODEL
020
025
030
040
050
7m
30
76
100
100
100
10m
75
190
250
250
250
15m
150
380
500
500
500
(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?
• Cheek that:
1) Outdoor fan is running, with warm air blowing off the outdoor unit (cooling cycle).
2) Indoor blower is running and discharge cool air (cooling cycle).
3) Suction (low side) pressure as recommended is before this.
4) The remote controller incorporate a 3 minute delay in there circuit. Thus, it requires about 3
minutes before the outdoor unit can start up.
24
20m
750
750
750
(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
Heat Pump Unit
Temperature
minimum indoor temperature
maximum indoor temperature
minimum outdoor temperature
maximum- outdoor temperature
Ts °C
10.0
26.7
-8.0
24
Ts : Dry bulb temperature
Th : Wet bulb temperature
25
Th °C
-9.0
18
Servicing and maintenance
Warning
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
Maintenance Procedure
1. Clean with a vacuum cleaner, or by tapping
lightly 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.
Indoor Fan
1. Check for unusual noise.
As necessary.
Indoor/Outdoor Coil
1. Check and remove dirt which are clogged
between fins.
Every month.
Pan & Pipe
2. Check and remove obstacles which hinder air
flow in and out of indoor/outdoor unit.
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.
Electrical
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.
26
The design of the MLC 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.
Under normal circumstances, these outdoor units only require a check and cleaning of air intake coil surface
once quarterly. However, if a unit is installed in areas subjected to much oil mist and dust, the coils must be
regularly cleaned by qualified Air Conditioner Service Technicians to ensure sufficient heat exchange and
proper operation. Otherwise, the systems life span may be shortened.
CAUTION!
Do not charge OXYGEN, ACETYLENE OR OTHER FLAMMABLE and poisonous gases into the unit
when performing a leakage test or an air tight test. These gases could cause severe explosion
and damage if expose the high temperature and pressure.
It is recommended that only nitrogen or refrigerant be charged when performing the leakage or airtight test.
27
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
1. Fan does not work 3 minutes after
starting
CAUSE
• Protection against the frequent starting. Wait 3 or 4 minutes.
•
•
•
•
3. The air conditioning unit does not
•
blow sufficiently
•
•
•
4. The remote control light is deficient •
•
•
5. Air discharge flow has a bad odor
•
2. The air conditioning unit does not
work
6. Condensation on the air grille of
indoor unit
7. The water flow of air conditioning
unit
8. The air conditioning unit are noisy
•
•
•
•
•
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.
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.
The batteries are discharge.
The batteries are not correctly inserted.
The assembly is not good.
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.
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.
Check the condensate evacuation.
• “Air flow noise” : refrigerant fluid admission in evaporator.
28
Diagnosis By Flow Chart (Cooling Only)
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 ( Compresor Does Not Start )
Evaporator
Fan Motor
Stop
Unit Power
Supply
Running
Faulty
Single-Phase
Fuse For
Operation Circuit
Blown
Overcurrent
Relay For
Evaporator Fan
Tripped
Evaporator Fan
Contactor
No Voltage or Low Voltage
Components Shorted
Connections Loose
High Volage or Low Voltage
Single-Phase
Faulty
Coil Burned
Contact Faulty
Faulty Fan Motor
Defective Operation Switch
Condenser
Fan Motor
Get the Riht voltage
Repair the Power Line
Repair or Replace The Components
Tighten The Connections
Get The Right Voltage
Check The Power SupplyTo 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
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
29
Get The Right Voltage
Check The Power Supply To The
Motor : Repair Connections When
Necessary
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
See "High Discharge Pressure" or
"Low Suction Pressure"
Clogged Capillary or Pressure
Switch
Repair Clogging and Replace The
Switch If Required
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
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
30
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
Low Refrigerant Charge
Low Discharge Pressure
Remove Obstacles To Air Circulation
Repair Or Replace If Necessary
Remove The Restriction
Add Refrigerant
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
31
Tighten All Fixed Screws
Check Flexible Ducts
For Heat Pump Models
By means of pressure readings :
=
=
High Side
Low Side
High Side
Low Side
High Side
Low Side
Too
High
PROBABLE CAUSE
A Little
High
Normal
Circuit
Too
Low
Data
A Little
Low
PRESSURE
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.
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.
5. Defective defrost control, outdoor coil freeze 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
=
By Means Of Diagnosis Flow Chart
Generally, there are two kind 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 breake & fuse
Fan fails to start
Compressor fails to start
Fan Motor Capacitor defective
Thermostat setting too high
Loose Connections,
Contactors
Protection Device Actuated
Irregular motor resistance (Ω)
& insulation (MΩ)
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)
32
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
Check air circulation
High heat 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 heat 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
33
Windows / doors
wide open
DOP : 0299
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