MDL Solutions PCG-08R-V, PCG-16-V, PCH-12-V, PCG-08-V, PCH-20-V Installation, Operation And Service Manual
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SUPERIOR SERIES
INSTALLATION OPERATION AND SERVICE MANUAL
(AMERICAS VERSION)
PCG(H)-V/P~AECM SERIES
V ~ 2 pipe
P ~ 4 pipe
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 2 of 98
ISO 9001 QUALITY
World Leading Design and Technology
Every product is manufactured to meet
the stringent requirements of the
internationally recognized ISO 9001
standard for quality assurance in
design, development and production.
Equipped with the latest CAD/CAM computer aided
design and manufacturing technology, our factories
in China and Thailand produce over 2,000,000 air
conditioning units each year, all conforming to the
highest international standards of quality and safety.
CE SAFETY STANDARDS
The Highest Standards of Manufacturing
All products conform to the Certificate
Europe directives (Machinery Safety,
Electromagnetic Compatibility and Low
Voltage), as required throughout the
European Community, to guarantee
correct standards of safety.
In order to guarantee the very highest standards
and performance, we manage every stage in the
manufacturing of our products. Throughout the
production process we maintain strict control,
starting with our extensive resources in research
and development through to the design and
manufacture of almost every individual component,
from molded plastics to the assembly of units and
controllers.
WEEE MARK
Quality Controlled from Start to Finish
All products conform to the “WEEE”
directive to guarantee correct standards
of environmental solutions.
Our highly trained staff and strict quality control
methods enable us to produce products with an
exceptional reputation for reliability and efficiency,
maintained over many years. As well as full CE
certification and ISO 9001, several products have
UL/ ETL / CSA (NRTL) safety approval plus ARI
Certification in the USA and Canada, in addition to
ROHS compliance for Europe, giving you the
confidence of knowing our company is the right
choice when selecting air conditioning equipment.
ALWAYS MAKE SURE THIS MANUAL REMAINS WITH THE WATER CASSETTE. READ THIS MANUAL BEFORE
PERFORMING ANY OPERATION ON THE WATER CASSETTE.
INVESTING IN QUALITY, RELIABILITY & PERFORMANCE.
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 3 of 98
Table of Content
A. TECHNICAL DATA ................................................................................................................................ 6
A.1. GENERAL SPECIFICATION ............................................................................................................................. 6
A.1.1. 2-Pipe Systems ..............................................................................................................................6
A.1.2. 4-Pipe Systems ..............................................................................................................................8
A.2. COIL DATA ................................................................................................................................................ 9
A.2.1. 2-Pipe Systems ..............................................................................................................................9
A.2.2. 4-Pipe Systems ..............................................................................................................................9
A.3. DIMENSIONAL DRAWINGS ......................................................................................................................... 10
A.4. VALVE INFORMATION ................................................................................................................................ 21
A.4.1. 2-Way Valve Body ...................................................................................................................... 21
A.4.2. 3-Way Valve Body ...................................................................................................................... 21
B. SAFETY PRECAUTIONS ...................................................................................................................... 22
B.1. INSTALLATION .......................................................................................................................................... 23
B.1.1. Standard Configurations and Accessories ................................................................................. 23
B.1.2. Operating Limits ........................................................................................................................ 24
B.1.3. Before Installation ..................................................................................................................... 24
B.1.4. Installation Location .................................................................................................................. 25
B.1.5. Installation and False Ceiling Clearance .................................................................................... 26
B.1.6. Pipe Works ................................................................................................................................. 27
B.1.7. Water Connections .................................................................................................................... 27
B.1.8. Valve configurations .................................................................................................................. 27
B.1.9. External Drain Pan ..................................................................................................................... 29
B.1.10. Fresh Air Renewal Connection ................................................................................................... 29
B.1.11. Branch Duct Connection ............................................................................................................ 32
B.1.12. Branch Duct Installation Procedure ........................................................................................... 33
B.2. SUSPENSION BOLTS LAYOUT AND FALSE CEILING OPENING .............................................................................. 34
B.2.1. Suspension Structure ................................................................................................................. 36
B.2.2. Installation Procedure ................................................................................................................ 37
B.3. INTERCONNECTING WIRING ....................................................................................................................... 40
B.3.1. Wiring procedures: .................................................................................................................... 40
B.3.2. Mounting Front Panel Assembly ................................................................................................ 41
B.3.3. Filter Removal ............................................................................................................................ 41
B.3.4. Getting Start-Up ........................................................................................................................ 42
B.4. MAINTENANCE ........................................................................................................................................ 43
B.4.1. For Units Out Of Use for Extended Period. ................................................................................ 43
B.4.2. Extra Maintenance .................................................................................................................... 43
B.5. AIR VENT AND WATER PURGE .................................................................................................................... 44
B.6. REPLACING MOTOR AND FAN BLOWER ........................................................................................................ 44
B.7. REPLACING CONDENSATE PUMP ................................................................................................................. 45
B.8. REPLACING CONTROL BOX ......................................................................................................................... 46
B.9. INSTALL ELECTRIC HEATER ......................................................................................................................... 47
C. CONTROL SPECIFICATIONS: SKUSA-NCGH-001-AECM ......................................................................... 48
C.1. I/O PORT DEFINITIONS ............................................................................................................................. 48
C.2. WIRING DIAGRAM ................................................................................................................................... 50
C.3. CONFIGURATION SETTINGS ........................................................................................................................ 52
C.4. CONTROL LOGICS FOR 2-PIPE SYSTEM ......................................................................................................... 53
C.4.1. With Valve Configuration .......................................................................................................... 53
C.4.2. Without Valve Configuration ..................................................................................................... 56
C.5. CONTROL LOGICS FOR 4-PIPE SYSTEM ......................................................................................................... 59
C.6. SLEEP MODE ........................................................................................................................................... 61
C.7. AUTO FAN SPEED ..................................................................................................................................... 62
C.8. MODULATING VALVE CONTROL UNDER ENERGY SAVING MODE ....................................................................... 62
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
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C.9. SWING / LOUVER ..................................................................................................................................... 62
C.10. BUZZER .................................................................................................................................................. 63
C.11. AUTO RESTART ........................................................................................................................................ 63
C.12. ON/OFF SWITCH ON THE FRONT PANEL ...................................................................................................... 63
C.13. DRAIN PUMP .......................................................................................................................................... 63
C.14. FLOAT SWITCH ......................................................................................................................................... 64
C.15. ELECTRIC HEATER SAFETY SWITCH .............................................................................................................. 64
C.16. LED INDICATION AND ERROR DESCRIPTION .................................................................................................. 65
C.17. LED INDICATION ON MASTER/SLAVE CONNECTION ....................................................................................... 66
D. NETWORKING SYSTEM ..................................................................................................................... 67
D.1. MASTER-SLAVE NETWORK ........................................................................................................................ 67
D.1.1. Master – Slave Network Setup .................................................................................................. 68
D.1.2. Master-Slave Communication Method ...................................................................................... 71
D.2. OPEN MODBUS PROTOCOL ........................................................................................................................ 72
E. CONTROL SPECIFICATIONS: SKUSA-NCGH-002/003-AECM .................................................................. 76
E.1. FEATURES ............................................................................................................................................... 76
E.2. I/O PORT DEFINITIONS ............................................................................................................................. 76
E.3. ONBOARD CONFIGURATION ....................................................................................................................... 77
E.4. WIRING DIAGRAMS .................................................................................................................................. 78
E.4.1. SKUSA-NCGH-002-AECM ........................................................................................................... 78
E.4.2. SKUSA-NCGH-003-AECM ........................................................................................................... 79
E.4.3. Zone control wiring diagram 1 (ON/OFF thermostat) ............................................................... 80
E.4.4. Zone control wiring diagram 2 (Modulating signal thermostat) ............................................... 81
E.5. CONTROL LOGIC SPECIFICATION .................................................................................................................. 82
E.5.1. Unit power ON/OFF ................................................................................................................... 82
E.5.2. Alarm protection and error display ........................................................................................... 82
E.5.3. Drain-pump run management ................................................................................................... 82
E.5.4. Swing and louver control ........................................................................................................... 82
E.5.5. Modulating signal input ............................................................................................................ 82
E.6. LED INDICATION AND ERROR DESCRIPTION .................................................................................................. 83
F. USER INTERFACE .............................................................................................................................. 84
F.1. REMOTE HANDSET ................................................................................................................................... 84
F.2. WIRED WALL PAD .................................................................................................................................... 85
F.2.1. Wall Pad Operation Guidelines .................................................................................................. 86
F.2.2. EC unit RPM setting ................................................................................................................... 89
G. SENSOR RESISTANCE R-T CONVERSION TABLE ................................................................................... 90
H. TROUBLESHOOTING GUIDE .............................................................................................................. 92
I. EXPLODED DIAGRAMS & SUB-ASSEMBLY DESCRIPTIONS ................................................................... 93
I.1. EXPLODED VIEW FOR SINGLE FAN MODEL .................................................................................................... 93
I.1.1. Spare Parts Of Single Fan Model ............................................................................................... 94
I.2. EXPLODED VIEW FOR TWIN FAN MODEL ...................................................................................................... 95
I.2.1. Spare Parts Of Twin Fan Model ................................................................................................. 96
I.3. OPTIONAL PARTS ..................................................................................................................................... 96
I.4. ACCESSORIES........................................................................................................................................... 97
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
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PCG
-
04 - V X - S -
AECM
AECM
EC motor configuration
for Americas
S
Complete function integrated
control, compatible with IR
handset controller, wired
wall-pad, serial networking for
master-slave and MODBUS BMS
functionality
W
Flexible function control for
external thermostat applications
with control of drain pump,
louvers and zone control product
operations
X
No control box pre-installed, for
on demand plug and play of Total
Control or Flex Control option
X 220V EC motor
Y
115V EC motor
P
Chilled/Hot Water, 4-Pipe
V
Chilled/Hot Water, 2-Pipe
VEH
Chilled Water, 2-Pipe with
Electric Heater
04–16
(for PCG)
Unit Sizes. See General
Specification section A for
cooling and heating capacities
12–20
(for PCH)
PCG
Hydronic Cassette G Series
PCH
Hydronic Cassette H Series
Model Code Nomenclature
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 6 of 98
PCG(H)-[Size]-V~-AECM
PCG-04R
PCG-08
PCG-08R
PCG-09
Unit Configuration
Configuration
2-pipe
Number Of Fan Blowers
Single
Twin
Power Supply
(V/Ph/Hz)
115/1/60
220/1/60
Operation Control - PCG(H)
~S: Complete function onboard PCB with integrated group control functionality, incl. 1 pc return air
sensor and 2 pcs temperature sensors.
~W: Limited function onboard PCB with drain-pump, louver and zone control functionality, incl. 1 pc coil
temperature sensor.
~X: No control box pre-installed.
Performance Data
Air
Total Air Flow
H
CFM
338
476
476
600
M
235
306
306
318
L
118
118
118
212
Cooling
Cooling Capacity
H
BTU/Hr
11348
16019
16857
20850
M
8129
11200
11742
12341
L
4721
5051
10372
8799
Sensible Cooling Capacity
H
7702
10802
11208
13999 M 5466
7486
7751
8184
L
3129
3315
6830
5791
Heating Heating Capacity
H
BTU/Hr
17105
23840
24436
30813 M 12089
16453
16831
17898 L 6867
7204
14809
12605
Max. Electric Heater Capacity @ 115V
1700
3400
5100
Max. Electric Heater Capacity @ 202V
3400
6800
10200
Sound
Sound Pressure Level ( Outlet )
dB(A)
38/35/27
46/35/24
46/35/24
42/34/26
Sound Power Level ( Outlet )
52/45/38
60/45/35
60/45/35
50/41/37
Electrical
Fan Motor Power
H W 30
40
40
60
M 9 18
18
24 L 8 8 8
16
Fan Motor Apparent Power @ H
60
80
80
120
Fan Motor Running Current @
115V
H A 0.26
0.35
0.35
0.52
Fan Motor Running Current @
220V
H
0.14
0.18
0.18
0.27
Hydraulic
Cooling Water Flow Rate
H
GPM
2.262
3.188
3.36
4.15 M 1.616
2.233
2.341
2.456 L 0.941
1.005
2.068
1.752
Cooling Pressure Drop
H
Ft.wg
3.498
7.943
11.373
7.379 M 1.979
4.288
6.115
3.001
L
0.487
0.654
4.942
1.686
Heating Water Flow Rate
@H/M/L
GPM
Same as "Cooling Water Flow Rate"
Heating Pressure Drop
H
Ft.wg
2.753
6.319
8.981
5.867
M
1.537
3.362
4.762
2.347 L 0.51
0.846
3.836
1.3
Water Content
Gal
0.33
0.41
0.36
0.58
Construction and Packing
Data
Water
Connections
Type
Socket (Threaded Female)
In
in.
3/4”
Out
Condensate Drainage Connection
Dimensions
L
in.
22.6
44.9
W
22.6
22.8 H 10.0
11.4
10.0
Panel Dimensions
26.8 x 26.8 x 1.1
26.8 x 48.8 x 1.1
Net Weight
lbs
61.7
66.1
72.8
110
a. Cooling mode (2-pipe):
b. Heating mode (2-pipe):
- Return air temperature: 80F DB/ 67F WB..
- Return air temperature: 70F
- Inlet/ Outlet water temperature: 45F/55F.
- Inlet water temperature: 140F.
- Water flow-rate: same as 2-pipe cooling.
A. Technical Data
A.1. General Specification
A.1.1. 2-Pipe Systems
Product range: PCG(H) -AECM Flexi Hydronic Cassette with EC Motor
PCG(H)-V~-AECM Hydronic Cassette 2-pipe with EC Motor (Americas Version)
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 7 of 98
PCG(H)-[Size]-V~-AECM
PCG-16
PCH-12
PCH-20
Unit Configuration
Configuration
2-pipe
Number Of Fan Blowers
Twin
Single
Power Supply
(V/Ph/Hz)
115/1/60
220/1/60
Operation Control - PCG(H)
~S: Complete function onboard PCB with integrated group control functionality, incl. 1
pc return air sensor and 2 pcs temperature sensors.
~W: Limited function onboard PCB with drain-pump, louver and zone control
functionality, incl. 1 pc coil temperature sensor.
~X: No control box pre-installed.
Performance Data
Air
Total Air Flow
H
CFM
853
765
1240
M
536
483
812
L
212
212
483
Cooling
Cooling Capacity
H
BTU/Hr
28882
23678
38241 M 19798
16376
29869 L 17385
8352
17164
Sensible Cooling Capacity
H
19440
16165
36426 M 13207
11081
20488 L 11562
5553
11586
Heating
Heating Capacity
H
BTU/Hr
42839
35968
59135 M 28973
24554
45725 L 25323
12196
25687
Max. Electric Heater Capacity @ 115V
5100
6800
Max. Electric Heater Capacity @ 220V
10200
13600
Sound
Sound Pressure Level ( Outlet )
dB(A)
48/37/26
50/40/28
54/45/30
Sound Power Level ( Outlet )
63/47/37
67/53/39
66/58/42
Electrical
Fan Motor Power
H W 80
88
200
M
52
32
61
L
16
20
22
Fan Motor Apparent Power @ H
240
144
362
Fan Motor Running Current @ 115V
H A 0.70
0.77
1.74
Fan Motor Running Current @ 220V
H
0.36
0.40
0.91
Hydraulic
Cooling Water Flow Rate
H
GPM
5.751
4.71
7.611 M 3.942
3.26
5.945 L 3.461
1.666
3.418
Cooling Pressure Drop
H
Ft.wg
8.846
7.785
7.785 M 4.604
4.13
5.077
L
3.678
1.307
1.959
Heating Water Flow Rate
@H/M/L
GPM
Same as "Cooling Water Flow Rate"
Heating Pressure Drop
H
Ft.wg
7.041
6.206
6.228
M
3.633
3.25
4.017 L 2.888
1.006
1.525
Water Content
Gal
0.73
0.47
0.63
Construction and Packing
Data
Water
Connections
Type
Socket (Threaded Female)
In
in.
3/4"
Out
Condensate Drainage Connection
Dimensions
L
in.
44.9
28.7
32.7 W 22.8
28.7
32.7 H 10.0
10.2
11.4
Panel Dimensions
26.8 x 48.8 x 1.1
32.7 x 32.7 x 1.1
38.6 x 38.6 x 1.1
Net Weight
lbs
115
79.4
110
a. Cooling mode (2-pipe):
b. Heating mode (2-pipe):
- Return air temperature: 80F DB/ 67F WB
- Return air temperature: 70F.
- Inlet/ Outlet water temperature: 45F/55F.
- Inlet water temperature: 140F.
- Water flow-rate: same as 2-pipe cooling.
Product range: PCG(H) -AECM Flexi Hydronic Cassette with EC Motor
PCG(H)-V~-AECM Hydronic Cassette 2-pipe with EC Motor (Americas Version)
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 8 of 98
PCG(H)-[Size]-P~-AECM
PCG-08
PCG-09
PCG-16
PCH-12
PCH-20
Unit Configuration
Configuration
4-pipe
Number Of Fan Blowers
Single
Twin
Single
Power Supply
(V/Ph/Hz)
115/1/60
220/1/60
Operation Control - PCG(H)
~S: Complete function onboard PCB with integrated group control functionality, incl. 1 pc return air sensor and 2 pcs temperature
sensors.
~W: Limited function onboard PCB with drain-pump, louver and zone control functionality, incl. 1 pc coil temperature sensor.
~X: No control box pre-installed.
Performance Data
Air
Total Air Flow
H
CFM
477
600
853
765
1240 M 306
318
536
483
812 L 118
212
212
212
483
Cooling
Cooling Capacity
H
BTU/Hr
13020
14451
21393
19707
26817 M 9720
8885
15011
13822
23060
L
8225
6498
12614
12201
18104
Sensible Cooling
Capacity
H
8997
9943
14793
13621
18777
M
6662
6047
10286
9465
16072
L
5612
4392
8666
8329
12527
Heating
Heating Capacity
H
BTU/Hr
15289
26600
30446
17993
34859
M
12895
16404
21665
17224
32083 L 11764
12030
19281
12393
27395
Max. Electric Heater Capacity @
115V
3400
5100
6800
Max. Electric Heater Capacity @
220V
6800
10200
13600
Sound
Sound PressureLevel ( Outlet )
dB(A)
46/37/24
48/34/26
48/37/26
50/40/28
54/45/30
Sound Power Level ( Outlet )
60/49/35
50/41/37
63/47/37
65/53/39
66/58/42
Electrica
l
Fan Motor Power
H W 40
60
80
88
200
M
18
24
40
32
61
L 8 16
16
20
22
Fan Motor Apparent Power @ H
80
120
240
144
362
Fan Motor Running
Current @ 115V
H A 0.35
0.52
0.70
0.77
1.74
Fan Motor Running
Current @ 220V
H
0.18
0.27
0.36
0.40
0.91
Hydraulic
Cooling Water Flow
Rate
H
GPM
2.592
2.879
4.258
3.927
5.342
M
1.939
1.766
2.987
2.75
4.595 L 1.637
1.292
2.513
2.427
3.604
Cooling Pressure
Drop
H
Ft.wg
4.152
5.551
3.949
9.297
5.168 M 2.505
2.415
2.144
5.032
3.994 L 1.891
1.417
1.487
4.062
2.64
Heating Water Flow
Rate
H
GPM
0.761
1.321
1.587
0.898
1.738 M 0.642
0.819
1.077
0.854
1.601 L 0.586
0.599
0.962
0.617
1.364
Heating Pressure
Drop
H
Ft.wg
0.361
0.616
0.781
0.465
0.878 M 0.269
0.266
0.431
0.431
0.758
L
0.23
0.157
0.352
0.244
0.575
Water Content
Chilled
Water
Gal
0.28
0.36
0.51
0.36
0.44
Hot
Water
0.13
0.23
0.23
0.11
0.2
Construction and Packing Data
Water
Connections
Type
Socket (Threaded Female)
In
in.
3/4"
Out
Condensate Drainage
Connection
Dimensions
L
in.
22.6
44.9
28.7
32.7
W
22.6
22.8
28.7
32.7
H
11.4
10.0
11.4
10.2
11.4
Panel Dimensions
26.8 x 26.8 x 1.1
26.8 x 48.8 x 1.1
32.7 x 32.7 x 1.1
38.6 x 28.6 x 1.1
Net Weight
lbs
66.1
110
115
79.4
110
:
a. Cooling mode (4-pipe):
b. Heating mode (4-pipe):
- Return air temperature: 80F DB/ 67F WB.
- Return air temperature: 70F.
- Inlet/ Outlet water temperature: 45F/55F.
- Inlet/ outlet water temperature: 180F/140F.
A.1.2. 4-Pipe Systems
Product range: PCG(H) -AECM Flexi Hydronic Cassette with EC Motor
PCG(H)-P~-AECM Hydronic Cassette 4-pipe with EC Motor (Americas Version)
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 9 of 98
Model
Fin Height
(inch)
Fin Length (inch)
Fins / inch
No. of rows
No. of
circuits
Tube
Diameter
(inch)
Inner
Outer
PCG-04R-V
7.9
47.1
51.1
13 2 3
3/8”
PCG-08-V
9.8
47.1
51.1
13 2 3
3/8”
PCG-08R-V
9.8
47.1
51.1
13 3 5
0.276”
PCG-09-V
7.9
84.6
90.0
13 2 4
3/8”
PCG-16-V
9.8
84.6
90.0
13 2 5
3/8”
PCH-12-V
8.7
60.2
64.3
13 2 4
3/8”
PCH-20-V
9.8
73.8
77.9
13 2 6
3/8”
Model
Fin Height
(inch)
Fin Length (inch)
Fins / inch
No. of rows
No. of
circuits
Tube
Diameter
(inch)
Inner
Outer
PCG-08-P
9.8
47.1
51.1
13 2 3
3/8”
PCG-09-P
7.9
84.6
90.0
13 2 3
3/8”
PCG-16-P
9.8
84.6
90.0
13 2 5
3/8”
PCH-12-P
8.9
60.2
64.3
13 2 3
3/8”
PCH-20-P
9.8
73.8
77.9
13 2 5
3/8”
Model
Fin Height
(inch)
Fin Length (inch)
Fins / inch
No. of rows
No. of
circuits
Tube
Diameter
(inch)
Inner
Outer
PCG-08-P
9.8
47.1
51.1
13 1 3
3/8”
PCG-09-P
7.9
84.6
90.0
13 1 3
3/8”
PCG-16-P
9.8
84.6
90.0
13 1 3
3/8”
PCH-12-P
8.7
60.2
64.3
13 1 2
3/8”
PCH-20-P
9.8
73.8
77.9
13 1 3
3/8”
A.2. Coil Data
A.2.1. 2-Pipe Systems
A.2.2. 4-Pipe Systems
Cooling Coil
Heating Coil
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
A.3. Dimensional Drawings
Dimensional Drawings: PCG-04R-V
Page 10 of 98
(All dimensions in inch.)
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Dimensional Drawings: PCG-08/08R-V
(All dimensions in inch.)
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Dimensional Drawings: PCG-09-V
(All dimensions in inch.)
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Dimensional Drawings: PCG-16-V
(All dimensions in inch.)
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Dimensional Drawings: PCH-12-V
(All dimensions in inch.)
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Dimensional Drawings: PCH-20-V
(All dimensions in inch.)
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Dimensional Drawings: PCG-08-P
(All dimensions in inch.)
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Dimensional Drawings: PCG-09-P
(All dimensions in inch.)
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Dimensional Drawings: PCG-16-P
(All dimensions in inch.)
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5.55
Dimensional Drawings: PCH-12-P
(All dimensions in inch.)
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32.68
Dimensional Drawings: PCH-20-P
(All dimensions in inch.)
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Valve Dimensions (inch)
DN A B C D
D20
(G3/4”)
2.2
1.9
0.9
2.5
Valve Dimensions (inch)
DN A B C D
D20
(G3/4”)
2.2
3.5 2 4
DN 3/4”
A.4. Valve Information
A.4.1. 2-Way Valve Body
A.4.2. 3-Way Valve Body
Differential Pressure Chart
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WARNING
Before any service or maintenance operations turn off the mains electrical supply.
B. Safety Precautions
When installing or performing maintenance or servicing the air conditioning equipment, observe the
precautions stated in this manual, in addition to those stated in the labels attached around the unit.
Ensure all local and national safety codes, laws, regulations, as well as general electrical and mechanical
safety guidelines are followed for installation, maintenance and service.
The appliance is for indoor use only.
Ensure the correct mains supply, with respect to the rating label on the unit, is used.
Power supply shall be incorporated in the fixed wiring and must have an air gap of at least 0.1 inch
between each active phase of conductors.
If the supply cord is damaged, it must be replaced by qualified personnel.
Installing and servicing air conditioning equipment should be done by qualified service personnel only.
This appliance is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they have been given supervision or
instruction concerning it.
Children should be supervised to ensure they do not play with the appliance.
The user of this appliance is responsible for his / her own safety.
Warranty shall be voided if installation instructions and safety precaution stated in this manual are not
observed.
Never cut off the mains supply when unit is under operation. The unit should be switched off by using only
the ON-OFF button on the control interface.
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Control Configuration Type
Accessory list:
~S:
Complete function onboard PCB
with integrated group control
functionality.
~W:
Limited function onboard PCB
with drain-pump, louver and
zone control functionality.
SKUSA-NCGH-001-AECM
Plug-and-play control box with
complete function controller.
Standard: Factory installed/
Optional: Field installed
N/A
SK-DFPS-A-002.1:
IR remote handset
Optional (1 pc)
N/A
SK-DFPS-A-002.2:
Wired wall-pad
Optional (1 pc)
N/A
SKUSA-NCGH-002/003-AECM
Plug-and-play control box with
limited functionality
N/A
Standard: Factory installed/
Optional: Field installed
SKUSA-DFPS-A-001~:
STCD wired thermostats
ALL models
N/A
Optional (1 pc)
Installation Manual
Standard (1 pc)
Standard (1 pc)
External Drain Pan
Standard (1 pc)
Standard (1 pc)
B.1. Installation
First check the contents of the package.
B.1.1. Standard Configurations and Accessories
There are three types of plug-and-play control box:
SKUSA-NCGH-001-AECM plug-and-play control box:
PCG(H)-(V/P)S configuration – complete function integrated controller, compatible with IR handset
controller, wired wall-pad, serial networking for master-slave and MODBUS applications.
SKUSA-NCGH-002-AECM plug-and-play control box:
PCG(H)-(V/P)W configuration – limited function controller, compatible with standard wired
thermostat controller, with zone control functionality.
SKUSA-NCGH-003-AECM plug-and-play control box:
PCG(H)-(V/P)W-EH configuration – limited function controller, compatible with standard wired
thermostat controller, with zone control functionality, with electrical heater compatibility.
Optional and standard accessories supplied with the unit are dependent on control configuration type.
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Volt
Phase
Hz
Remark
208~240
1
60
PCG/PCH-~X-AECM
110~120
1
60
PCG/PCH-~Y-AECM
Minimum entering water temperature
+2 °C (35.6°F)
Maximum entering water temperature
+80 °C (176°C)
Water side maximum pressure
1400 kPa (142 m.w.c)
Figure 1
Figure 2
B.1.2. Operating Limits
Power supplies
Water circuit
B.1.3. Before Installation
The installation site must be established by the system designer or other qualified professional,
taking account of the technical requisites and current standards and legislation.
Cassette fan coils must be installed by an authorized company only.
Cassette fan coils are designed for installation in a false ceiling, for intake of fresh air from outside
and for diverting a small part of the treated air into a neighboring room.
They must be installed in such a way as to enable treated air to circulate throughout the room and
allow the minimum distances required for technical maintenance operations.
It is advisable to place the unit close to the installation site without removing it from the packaging.
Do not put heavy tools or weights on the packaging.
Upon receipt the unit and the packaging must be checked for damage sustained in transit and if
necessary, a damage claim must be filed with the shipping company.
Check immediately for installation accessories inside the packaging.
Do not lift unit by the condensate drain discharge pipe or by the water connections; lift it by the four
corners.(Figure 1)
Check and note the unit serial number.
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B.1.4. Installation Location
Do not install the unit in rooms where flammable gas or alkaline acid substances are present.
Aluminum/copper coils and/or internal plastic components can be damaged irreparably.
Do not install in workshops or kitchens; drawn in oil vapors might deposit on the coils and alter their
performance or damage the internal plastic parts of the unit.
Installation of the unit will be facilitated by using a stacker and inserting a plywood sheet between
the unit and the elevated stacker.(Figure 2)
It is recommended to position the unit as centrally as possible in the room to ensure optimum air
distribution.(Figure )
Generally the best louver position is the one which allows air diffusion along the ceiling. Alternatively
intermediate positions can be selected.
Generally the best louver position should be adjust to allow air diffusion along the ceiling.
Alternatively intermediate positions can be selected
Check that it is possible to remove panels from ceiling in the selected position, to allow enough
clearance for maintenance and servicing operations.
Figure 3
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Model
A (inch)
B (inch)
PCG-04R/09
10
0.4 or more
PCG-08/08R/16
PCH-20
11.4
0.4 or more
PCH-12
10.2
0.4 or more
B
A
B.1.5. Installation and False Ceiling Clearance
Surrounding area must have sufficient strength to carry the weight of the unit.
The inlet and outlet grilles must not be obstructed and the conditioned air should be able to blow all
over the room.
Ensure location allows condensate to be easily drained.
Check the distance between the upper slab and false ceiling to ensure the unit will fit comfortably.
Ensure there is sufficient space around the unit to service it.
Figure 3
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Model
External valve information
Type
Connector dia. (inch)
All models
2-way & 3-way
3/4”
B.1.6. Pipe Works
Indoor Unit
The unit is fitted with a condensate pump with a 20 inch. lift.
The unit is provided with 1 inch drainage head made of ABS.
Before connecting polyvinyl tube with an inner diameter of 1 inch, check if the drainage head is in
good condition.
Fit drainage head into polyvinyl tube awith a hose clip. (Figure 5).
The drain must be installed with a downward slope.
On completion the drain line should be insulated.
B.1.7. Water Connections
The cassette unit uses a 3/4” water piping connection with gaskets. It is advisable to tighten the
connections with two spanners.
B.1.8. Valve configurations
~S: Units are compatible with:
- 230VAC 2-way and 3-way on/off valves (thermoelectric or electric motor-driven actuation), with
OPEN/CLOSE state actuation.
- 24VAC 2-way and 3-way modulating valves with 0 – 10VDC modulating signal (motor-driven
actuation) and variable size aperture (10% to 100%).
~W: Valve control originates in external wired thermostat. See thermostat manual for details.
Connections:
Review below table for information on valve diameter.
Figure 4
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Valve installations:
See drawings of external valve installation below, by model type.
2-pipe systems:
Figure 5
4-pipe systems:
Figure 6
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Extended Drain Pan
Main Drain Pan
B.1.9. External Drain Pan
Procedures:
1. Align the two screw holes in the fixing plate to the two holes in the external drain pan. (Figure 7)
2. Make sure the drain pan is horizontal.
3. Tighten the two screws while making sure the external drain pan is installed evenly against the
fixing plate. (Figure 8)
When the installation is completed, it is necessary to wrap the connecting pipe with thermal insulation to
prevent condensation on ceiling tiles.
B.1.10. Fresh Air Renewal Connection
The fresh air system for cassette units allows up to 15% of unit airflow to be fresh air intake (per
connection). Maximum 2 fresh air connections per unit are allowed.
1. The corners of the cassette allow separate ductwork to be installed for outside air intake (Figure 9).
2. Cut and remove thermal insulating material.
3. Open the mounting plate (Figure 10 and Figure 11)
4. Install the flange to casing and attach with 2 screws. The flange is a rectangular duct with the
dimensions of 4.3 x 2.2inch.
Figure 7
Figure 8
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Figure 10
(All dimensions shown in inch)
Figure 11
Figure 12
Figure 13
Figure 9
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Figure 14 - Fresh Air Flange dimension
(All dimensions shown in inch)
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B.1.11. Branch Duct Connection
The side opening allows separate ductwork to be installed for branch ducting. (Figure 15 and Figure
16).
Cut and remove anti-condensate insulating material.
Install your flanges and conduits to casing. Conduit can be flexible polyester with spring core or
corrugated aluminum externally coated (dia. 4 inch) with anti-condensate material (0.5-1 inch thick
fiberglass).
Flanges (spigots) and blanking plates are available as separate accessories items.
(All dimensions shown in inch)
Figure 15 - Branch Duct Dimension
Figure 16
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B.1.12. Branch Duct Installation Procedure
1. Look for the yellow sticker on the casing for the location of branch duct or fresh air intake
connections.
2. The sticker is at the center of a knock out hole underneath the casing insulation. Use a cutter and
follow along the pre-cut circular marking as shown and trim off the insulation.
3. Knock out the pre-cut hole.
4. Connect the flange on to the opening with Φ0.1 inch. x 0.5 inch. tapping screws.
(All dimensions shown in inch)
Figure 17
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B.2. Suspension Bolts Layout and False Ceiling Opening
Using the installation template, open the ceiling panels and install the suspension bolts as in the images
below.
PCG-04R/08/08R~
23.6 x 23.6 inch: Dimensions for opening
24.5 x 11 inch: Suspension Bolts
PCG-09/16~
23.6 x 45.7inch: Dimensions for opening
29.5 x 24.9 inch: Suspension Bolts
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PCH-12~
29.5 × 29.5 inch: Dimensions for opening
13.6 × 30 inch: Suspension Bolts
PCH-20~
33.5 × 33.5 inch: Dimensions for opening
19.1 × 34 inch: Suspension Bolts
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Figure 18
Figure 19
B.2.1. Suspension Structure
Mark the position of the suspension rods, water lines, _ condensate drain pipe, power supply cables
and remote control cable.
Supporting rods can be fixed, depending on the type of ceiling, as shown in Figure 18 and Figure 19.
Fit suspension brackets supplied with the unit to the threaded rods (Figure 20)
Do not tighten nuts and counter nuts; this should only be done after the final leveling of the unit_
when all the connections have been completed.
Ensure the ceiling is horizontally level, otherwise the condensate water cannot drain away.
The casing is fixed to the slab with 4 drop rods. The rods should have two nuts and washers to lock
the unit in position. The cassette brackets will then hook over the washers.
Take care when lifting the cassette into position. Don’t lift the unit by the drip tray.
Figure 20
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Figure 21
Figure 22
Rod
B.2.2. Installation Procedure
1. Lift unit (without the air panel) with care by its four corners only. Do not lift unit by the condensate
drain discharge pipe or by the piping connections.
2. Incline the unit (Figure 21, Figure 22, Figure 24 and Figure 25) and insert it into the false ceiling.
Insert the rods into the bracket slot. With minimum false ceilings clearance, it might be necessary to
remove some T bars of the false ceiling temporarily to ensure there is enough clearance.
3. Using a level guide, line up the unit with a spirit level_ to ensure an even distance between the body
of the unit and the lower part of the false ceiling (Figure 23, Figure 26).
4. Line up the unit to the supporting bars of the false ceiling tightening the nuts and counter nuts of the
threaded rods.
5. After connecting of the condensate drain piping and piping connections, check again that the unit is
level.
6. The spaces between the unit and ceiling can now be adjusted. Use the drop rods to make the
adjustment.
7. Check to ensure the unit is level. The drain will then automatically be lower than the rest of the drip
tray.
8. Tighten the nuts on the suspended rods.
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Figure 23
MODEL
All single fan models
Clearance
0.1 inch
Figure 24
Rod
Clearance between the unit and false ceiling for models with single fan
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Figure 25
Figure 26
MODEL
All twin fan models
Clearance
0.1 inch
Clearance between the unit and false ceiling for models with twin fan
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B.3. Interconnecting Wiring
We recommend that screened cable be used in electrically noisy areas.
Always separate low voltage (5VDC) signal wires from power line (230 VAC).
Do not install the unit where electromagnetic waves are directly emitted towards the infra red receiver
on the unit.
Install the unit and components as far away as is practical (at least 16.4 ft) from the electromagnetic
wave source.
Where electromagnetic waves exist use shielded sensor cable.
Install a noise filter if the power supply generates disturbing noises.
Important note: Please ensure the cable of the main power supply is longer than 19.7 inch from the control box
terminal block. This is to ensure the control box can be slid out easily during maintenance activities.
Always take safety precaution before wiring for mains supply. See section B. Safety Precaution.
B.3.1. Wiring procedures:
1. Open the terminal block cover by removing the 4 screws
2. Connect power cable to the terminal according to the wiring diagram
3. Connect room temperature sensor and coil temperature sensors to the control box
4. Connect stepping motor
5. Connect receiver display
6. Connect wall pad (optional)
7. Slide the control box into the unit casing and attach with 2 screws
Figure 27
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Figure 28
Figure 29
B.3.2. Mounting Front Panel Assembly
1. Remove return grille from the front panel.
2. Move the front panel to the unit casing.
3. Tighten 4 screws to attach the front panel as shown in Figure 28 and Figure 29.
B.3.3. Filter Removal
1. Unlock the two catches on the front panel.
2. Open the grille downward with care.
3. Pull the filter out along the slot.
4. Clean the filter and reassemble.
Figure 30
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B.3.4. Getting Start-Up
The unit should not be started up until the system piping has been cleaned and all the air has been
purged.
Check condensate drain pipe slope.
After you have connected the main power supply to the cassette unit, it is necessary to check that
the condensate water pump installed inside the unit is in working order.
Due to transport vibration it is possible that the float switch is suspended and the pump might not
work correctly. For this reason, you must do the following to ensure the unit works effectively.
o Install the cassette unit in an absolute horizontal position.
o Fill the internal drain pan (manually) with enough water to check the drain pump is working.
o You can fill the internal drain pan by pouring water through the external drain pan.
o If everything is functioning correctly, the water will be expelled from the unit into the pipe work you
have installed. If the water is not expelled, please manually check the float switch is not faulty.
Make sure that the air filter is clean and properly installed.
Ensure that the power rating values of the electrical connection correspond with the unit rating label.
Verify that all the louvers can be manually opened smoothly by hand.
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B.4. Maintenance
1) Turn off the main power switch before performing any service or maintenance operations. Please
see section B. “Safety Precautions”.
2) The air filter is made of acrylic fiber and is washable in water. To remove filter simply open the intake
grille by releasing the two catches. See Figure 30 for the section filter removal.
3) Check the filter before the operating season and then periodically while in use; clean or replace as
necessary.
B.4.1. For Units Out Of Use for Extended Period.
Prior to restarting the unit:
Clean or replace the air filters.
Check and remove any obstruction from the external drain pan and the internal drain pan.
B.4.2. Extra Maintenance
The electrical panel is easily accessible by removing the cover panel.
The inspection or replacement of internal components such as the heat exchanger coil, condensate
drain pump, or float switch, involves the removal of the condensate drain pan.
During the removal of the condensate drain pan protect the floor under the unit from water spillage
with a plastic sheet.
Unscrew the drain pan fixture and remove the condensate drain pan with care.
The appliance is meant to be maintained by qualified service personnel and located at a height of
8.2ft or more.
Please see section B. Safety Precaution.
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Figure 31
Figure 32
Step 1: Remove grille to access the area indicated by the
red line.
Step 2: Release the air vent / water purge by turning the
knobs.
Figure 33
Figure 34
Step 4 : Use a spanner to remove the fan blower.
Step 5 : Remove the motor by undoing the 4 bolts and then
disconnect the fan motor wire connector.
B.5. Air Vent and Water Purge
B.6. Replacing Motor and Fan Blower
Refer to Section B.3.2 for Step 1 - 3.
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Figure 35
Figure 36
Step 3: Remove front panel and disconnect stepping motor
and IR receiver.
Step 4: Remove the drain pan fixture by unscrewing the 8
screws as shown.
Figure 37
Figure 38
Step 5: Remove the drain pan fixture and internal drain
pan.
Step 6: Remove the drain pump or valve.
B.7. Replacing Condensate Pump
Refer to Section B.3.2 for Step 1 - 2.
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Figure 39
Figure 40
Step 4: Remove 2 screws from control box.
Step 5: Sliding out the control box.
Figure 41
Step 5: Remove the terminal cover by unscrewing the 4
screws and unplugging the wiring on the terminal. Replace
with a new control box.
B.8. Replacing Control Box
Refer to Section B.3.2 for Step 1 - 3.
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Figure 42
Figure 43
Step 6: Snap in the insulated ring of the electric heater to the electric heater mounting shown above.
Figure 44
Step 7: Plug in the electric heater wiring to the connector
shown above.
B.9. Install Electric Heater
To access the inner coil area to install the electric heater, please refer to Figure 35, Figure 36 and Figure 37 for
Step 1 - 5.
Remark:
If PCG/PCH is installed to the EH, the EH is turned off when fan RPM is less than 300. Use the remote
handset or wired wall pad to change fan speed to Medium or High speed.
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Ts = Setting temperature
AUX1 = Hot water free contact
Tr = Room air temperature
AUX2 = Chilled water free contact
Ti1 = Chilled water coil temperature
MTV1 = Chilled water valve
Ti2 = Hot water coil temperature
MTV2 = Hot water valve
I/O
Code
2-Pipe
4-Pipe
Analogue
Input
Return air sensor
AI1
Return air temperature (Tr)
2-pipe coil circuit
sensor
AI2
Chilled / hot water coil circuit
(Ti1)
Chilled water coil circuit
(Ti1)
Hot water sensor
AI3
N/A
Hot water coil circuit (Ti2)
Input
LED display / IR
receiver
X-DIS 1
Digital communication port to LED display / IR receiver board.
Wired wall pad
TTL1
Digital communication port to wired wall-pad board.
Digital input
Occupancy contact
ON/OFF
Window contacts: for remote ON/OFF (when DIPB SW1=1).
Economy mode contacts: for remote activation of economy mode
(when DIPB SW1=0).
Float switch
Float
Voltage-free (NC)
Electrical heater
safety switch
EH
Voltage-free (NC). The contact is closed before the EH is turned on.
Power input
Phase
L1
Power supply to the PCB and all the loads connected to the voltage
outputs. Max length: 16.4ft.
Neutral
N1
Power supply to the PCB and all the loads connected to the voltage
outputs. Max length: 16.4ft.
Earth
PE1
Power supply to the PCB and all the loads connected to the voltage
outputs. Max length: 16.4ft.
Voltage
output
Fan 1
CN4
Fan 1 driver
Fan2
CN5
Fan 2 driver and motor connection port.
Valve1
MTV1
2-pipe coil circuit valve output –
chilled / hot water valve.
Voltage output (L)
4-pipe coil circuit valve output –
chilled water valve.
Voltage output (L)
Valve2
MTV2
Reserved
4-pipe coil circuit valve output –
hot water valve.
Voltage output (L)
Water pump
WP
Power supply to condensate pump
Voltage output (L)
Voltage of electrical
heater (Live)
L-EH
Voltage output (L), maximum 30A
[See wiring diagram, cross check with supplier].
Stepping motor
CN1-2
Power supply to louver stepping motors
Voltage output (L)
C. Control Specifications: SKUSA-NCGH-001-AECM
Used in all PCG/PCH [V/P] S unit configurations.
Complete function integrated controller, compatible with IR handset controller, wired wall-pad, serial networking for
master-slave and MODBUS applications.
Abbreviations
C.1. I/O Port Definitions
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I/O
Code
2-Pipe
4-Pipe
Output
Auxiliary contact 2
AUX2
Cooling mode signal relay (NO). Voltage free contact.
To ensure the sensitivity of the connection, please make sure max
wiring length < 98.4ft.
Auxiliary contact 1
AUX1
Heating mode signal switch (NO). Voltage free contact.
To ensure the sensitivity of the connection, please make sure max
wiring length < 98.4ft.
Serial BUS port
CN3
Master-slave network serial connection OR
MODBUS / local PC host network serial connection.
24VAC power input
DA1
24VAC external power supply (modulating valve applications only).
Modulating valve
output 1
DA2
Connection to DC modulating
valve on 2-pipe coil circuit
- chilled / hot water.
Connection to DC modulating
valve on 4-pipe coil circuit
- chilled water.
Modulating valve
output 2
DA3
N/A
Connection to DC modulating
valve on 4-pipe coil circuit
- hot water.
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C.2. Wiring Diagram
SKUSA-NCGH-001-AECM, ~S Configuration: Full Control PCB:
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
CPU
PR-O
AUX2
AUX2
AUX1
AUX1
N
pump
electrical
heating 30A
heating value
cooling value
low speed
medial speed
high speed
VALVE1
VALVE2
N
HFLFMF
N
remote receiver display
room temperature
cool pipe temperature
hot pipe temperature
wall pad
step moter3~4
step moter1~2
ON
DIP1~8
87654
3
2
1
123
4
DIP9~14
ON
L
L-EH
FLOAT
FLOAT
EH
EH
N-WP
WP
CN1~2
CN3
CN4
CN5
CN6
CN7
S1S2
5
6
PR-O
RS485
CPU
PR-O
AUX2
AUX2
AUX1
AUX1
N
pump
electrical
heating 30A
heating value
cooling value
low speed
medial speed
high speed
VALVE1
VALVE2
N
HFLFMF
N
ON
DIP1~8
87654
3
2
1
123
4
DIP9~14
ON
L
L-EH
FLOAT
FLOAT
EH
EH
N-WP
WP
CN1~2
CN3
CN4
CN5
CN6
CN7
S1S2
5
6
PR-O
RS485
CPU
PR-O
AUX2
AUX2
AUX1
AUX1
N
pump
electrical
heating 30A
heating value
cooling value
low speed
medial speed
high speed
VALVE1
VALVE2
N
HFLFMF
N
ON
DIP1~8
87654
3
2
1
123
4
DIP9~14
ON
L
L-EH
FLOAT
FLOAT
EH
EH
N-WP
WP
CN1~2
CN3
CN4
CN5
CN6
CN7
S1S2
5
6
PR-O
RS485
TO slave unit
Master unit
Master slave networking wiring diagram:
Page 51 of 98
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Note: 0 = OFF
1 = ON
SW1-SW5 Network address setting
DIPA-S1
DIPB-S2
SW5/SW6 Fan Qty setting
SW5=0 Single fan application
SW6=1
SW5=1 Twin fans application
SW6=1
SW7/SW8 Operating mode
SW7=0 Cooling and heating modes available
SW8=0
SW7=0 Cooling and heating modes available,
SW8=1 with EH functioning as booster
SW7=1 Cooling mode only available
SW8=0
SW7=1 Cooling and heating modes available,
SW8=1 with EH functioning as primary
Master / Slave setting
SW6=1 Master
SW6=0 Slave
Preheat temperature setting
SW4=1 82.4ºF
SW4=0 96.8ºF
ON/OFF valve setting
SW3=1 With valve
SW3=0 No valve
2-pipe/4-pipe system configuration
SW2=1 4-pipe system
SW2=0 2-pipe system
PR-O contact setting
SW1=1 Window contact (remote on/off)
When PROs closed for 10 minutes, unit
enters standby mode.
When PROs opened, unit resumes operation.
SW1=0 Economy contact
When PROs closed, dead-band condition is
increased from “Tr=Ts+/-1.8 ºF” to
“Tr=Ts+/-7.2 ºF”.
C.3. Configuration Settings
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UNIT ON/OFF
There are 3 ways to turn the system on or off:
a) By the ON/OFF button on the remote handset or wired wall pad.
b) By the programmable timer on the handset or wired wall pad.
c) By the manual control button on the unit.
AUTO-RESTART
The system uses a non-volatile memory to save the present operation parameters when system is turned
off or in case of system failure or cessation of power supply.
The restored parameter data-set depends on the type of user interface.
a) Handset only user interface:
When the power on signal is received by the unit and no wired wall-pad is installed, the Mode, Fan
Speed, Set temperature and Louver/Swing setting will be the same as the handset setting before the
last power off.
b) Wall-pad only OR wall-pad and handset user interface:
When the power on signal is received by the unit and a wired wall-pad is installed, the Mode, Fan
Speed, Set temperature, Louver/Swing setting and Timer ON/OFF weekly program will be the same
as the wall pad setting before the last power off.
C.4. Control Logics For 2-Pipe System
C.4.1. With Valve Configuration
COOL MODE
a) MTV2, AUX1 and electric heater are always off.
b) If Tr ≥ Ts + 1.8ºF (or + 7.2ºF if economy contact is activated), then cool operation is activated and
MTV1 and AUX2 are turned on. Indoor fan runs at set speed.
c) If Tr < Ts, cool operation is terminated and MTV1 and AUX2 are turned off. Then indoor fan runs at
set speed.
d) The range of Ts is 60.8 - 86ºF
e) Indoor fan speed can be adjusted to low, medium, high and auto.
f) When turned on, MTV1 requires 30 seconds before it is fully open.
g) When turned off, MTV1 requires 120 seconds before it is fully closed.
h) When the unit is turned off, the indoor fan will shut down after 5 seconds.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
a) If Ti1 ≤ 35.6ºF for 2 minutes, then MTV1 and AUX2 are turned off. If indoor fan is set for low speed,
then it will run at medium speed. If it is set at medium or high speed, then it will keep running at
the same speed.
b) If Ti1 ≥ 41ºF for 2 minutes, then MTV1 and AUX2 are turned on. Indoor fan runs at set speed.
FAN MODE
a) Indoor fan runs at the set speed while heater, MTV1, MTV2, AUX1 and AUX2 are turned off.
b) Indoor fan speed can be adjusted to low, medium and high.
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HEAT MODE
Heat mode without electrical heater
a) MTV2, AUX2 and electric heater are always off.
b) If Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy contact is activated), then heat operation is activated and
MTV1 and AUX1 are turned on. Indoor fan runs at the set speed.
c) If Tr > Ts, then heat operation is terminated and MTV1 and AUX1 are turned off. Indoor fan runs at
200rpm.
d) The range of Ts is 60.8 - 86ºF.
e) Indoor fan speed can be adjusted to low, medium, high and auto.
f) When turned on, MTV1 requires 30 seconds before it is fully open.
g) When turned off, MTV1 requires 120 seconds before it is fully closed.
Heat mode with electrical heater as booster
a) MTV2 and AUX2 are always off.
b) If Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy contact is activated), then heat operation is activated and
MTV1 and AUX1 are turned on. Indoor fan runs at the set speed.
c) If Tr > Ts, then heat operation is terminated and MTV1 and AUX1 are turned off. Indoor fan runs at
200rpm
d) If Ti1 < 104ºF, then the electrical heater is turned on. If 104ºF ≤ Ti1 < 113ºF, then the electrical
heater maintains its original state. If Ti1 ≥ 113ºF, then the electrical heater is turned off.
e) The range of Ts is 60.8 - 86ºF
f) Indoor fan speed can be adjusted for low, medium, high and auto.
g) When turned on, MTV1 requires 30 seconds before it is fully open.
h) When turned off, MTV1 requires 120 seconds before it is fully closed.
Heat mode with electrical heater as primary heat source
a) MTV1, MTV2, and AUX2 are always off
b) If Ti2 ≤ 86ºF (or Ti2 is damaged or disconnected), AND if Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy
contact is activated), then heat operation is activated and the electrical heater and AUX1 are
turned on. Indoor fan runs at set speed.
c) If Tr > Ts, then heat operation is terminated and the electrical heater and AUX 1 are turned off.
Indoor fan runs at 200rpm.
d) The range of Ts is 60.8 - 86ºF
e) Indoor fan speed can be adjusted to low, medium, high and auto.
Over-heat protection of indoor coil in heat mode
a) If Ti1 ≥ 167ºF, then MTV1, AUX2 and EH are turned off, then the indoor fan runs at high speed,
even in standby mode.
b) If Ti1 < 158ºF, then the unit will maintains its original state.
c) If the indoor coil temperature sensor is damaged, then the protection mode will be overridden and
the pre-heat and post-heat set times will be used instead.
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PRE-HEAT
Pre-heat without electrical heater
a) If Ti1 < 96.8ºF [or < 82.4ºF is selected by DIPB-S2 position SW4], then MTV1 and AUX1 are turned
on, indoor fan runs at 200rpm.
b) If Ti1 ≥ 100.4ºF [or ≥ 86ºF is selected by DIPB-S2 position SW4], then MTV1 and AUX1 are turned
on, indoor fan runs at set speed.
c) If the indoor coil temperature sensor is damaged, then the pre-heat time is set for 2
minutes.Indoor fan runs at set speed.
Pre-heat with electrical heater
a) If the indoor fan speed ≥ 300rpm, then the electrical heater will turn on.
POST-HEAT
Post-heat without electrical heater
a) If Ti1 ≥ 100.4ºF, then MTV1 and AUX 1 are off. then indoor fan continues to run at set speed.
b) If 96.8°F ≤ Ti1 ≤ 100.4°F, then MTV1 and AUX1 are turned off. Indoor fan maintains its original
state.
c) If Ti1 < 96.8ºF, then MTV1 and AUX1 are turned off. Indoor fan runs at 200rpm.
d) If the indoor coil temperature sensor is damaged, then the post-heat time is set for 3 minutes.
Indoor fan runs at set speed.
Post-heat with electrical heater
a) Indoor fan will run at 200rpm before the unit turns off for 20 seconds.
Over-heat protection of indoor coil in post-heat
a) If Ti1 ≥ 167ºF, then MTV1 and AUX1 are turned off. Indoor fan remains on and runs at high speed.
b) If Ti1 < 158ºF, then MTV1 and AUX1 are turned on. Indoor fan remains on and runs at set speed.
c) If the indoor coil temperature sensor is damaged, then the protection mode will be overridden and
the unit will work according to the pre-heat and post-heat program.
DEHUMIDIFICATION MODE
a) MTV2, AUX1 and heater are always off.
b) If Tr ≥ 77ºF, then MTV1 and AUX2 will be ON for 3 minutes, and then OFF for 4 minutes.
c) If 60.8ºF ≤ Tr < 77ºF, then MTV1 and AUX2 will be ON for 3 minutes, and then OFF for 6 minutes.
d) If Tr < 60.8ºF, then MTV1 and AUX2 will be turned off for 4 minutes.
e) At the end of the above dehumidification cycle, the system will decide the next dehumidification
control option. Indoor fan will run at low speed throughout the dehumidification process.
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AUTOMODE
Auto cool/heat/heat with electric heater as booster
Every time the unit is turned on, MTV1 is on, AUX1, AUX2 and fan are off. MTV2 and heater are always
off.
After 120sec, the subsequent operation mode is decided according to the following programs:
a) If the coil temperature sensor (Ti1) ≥ 96.8°F, then MTV1, AUX1 and fan turn on or off according to
HEAT mode.
b) If Ti1 < 96.8°F, then MTV1, then AUX2 and fan turn on or off according to COOL mode.
Unit remains in AUTO COOL or AUTO HEAT mode throughout the operating cycle until the user changes
the mode manually or restarts the unit.
Should the Ti1 sensor be damaged, auto mode will not function.
Auto heat with electric heater as primary heat source / all configuration auto changeover
If the current running mode is auto cool mode, then the control logic will change over to auto heat
mode when all the following conditions are met:
a) Ts - Tr ≥ 1.8°F (or 7.2ºF if economy contact is activated)
b) MTV1 has stopped ≥ 10 min.
If the current running mode is auto heat mode, then the control logic will change over to auto cool
mode when all the following conditions are met:
a) Tr - Ts ≥ 1.8°F (or 7.2ºF if economy contact is activated)
b) MTV1 has stopped ≥ 10 min.
Note: Auto cool or auto heat operation are the same as cool or heat mode respectively.
C.4.2. Without Valve Configuration
COOL MODE
a) Electric heater, AUX1, MTV1 and MTV2 are always off.
b) If Tr ≥ Ts + 1.8ºF (or + 7.2ºF if economy contact is activated), then cool operation is activated and
AUX2 is turned on. Indoor fan runs at set speed.
c) If Tr < Ts, then cool operation is terminated and AUX2 is turned off. Indoor fan is turned off.
d) The range of Ts is 60.8 - 86ºF
e) Indoor fan speed can be adjusted to low, medium, high and auto.
Note: When the unit is turned off, the indoor fan shut down after 5 seconds.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
a) If Ti1 ≤ 35.6ºF for 2 minutes, then AUX2 is turned off. If low speed is selected via user interface,
then indoor fan runs at medium speed. If medium or high speed is selected via user interface, then
indoor fan runs at set speed.
b) If Ti1 ≥ 41ºF for 2 minutes, then AUX2 is turned on. Indoor fan runs at set speed.
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FAN MODE
a) Indoor fan runs at the set speed while heater, AUX1, AUX2, MTV1 and MTV2 are turned off.
b) Indoor fan speed can be adjusted to low, medium and high.
HEAT MODE
Heat mode without electrical heater
a) MTV1, MTV2, AUX2 and heater are always off.
b) If Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy contact is activated), then heat operation is activated and
AUX1 is turned on. Indoor fan runs at the set speed.
c) If Tr > Ts, then heat operation is terminated and AUX1 is turned off. Indoor fan runs at 200rpm.
d) The range of Ts is 60.8 - 86ºF.
e) Indoor fan speed can be adjusted to low, medium, high and auto.
Heat mode with electrical heater as booster
a) MTV1, MTV2 and AUX2 are always off.
b) If Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy contact is activated), then heat operation is activated and
AUX1 is turned on. Indoor fan runs at the set speed.
c) If Tr > Ts, then heat operation is terminated and AUX1 is turned off. Indoor fan runs at 200 rpm.
d) If Ti1 < 104ºF, then the electrical heater is turned on. If 104ºF ≤ Ti1 < 113ºF, then the electrical
heater maintains its original state. If Ti1 ≥ 113ºF, then the electrical heater is turned off.
e) The range of Ts is 60.8 - 86ºF.
f) Indoor fan speed can be adjusted to low, medium, high and auto.
Heat mode with electrical heater as primary heat source
a) MTV1, MTV2 and AUX2 are off.
b) If Ti1 < 96.8ºF [or 82.4ºF is selected by DIPB-S2 position SW4], then AUX1 is on while indoor fan
remains off.
c) If Ti1 ≥ 100.4ºF [or 86ºF is selected by DIPB-S2 position SW4], then AUX1 is on while indoor fan
runs at set speed.
d) If the indoor coil temperature sensor is damaged, then the pre-heat time is set for 2 minutes.
Indoor fan runs at set speed.
PRE-HEAT
Pre-heat with electrical heater
a) Indoor fan will start after the electrical heater has been turned on for 10 sec.
POST-HEAT
Post-heat with and without electrical heater
a) AUX1 is off. Electrical heater is turned off.
b) Indoor fan will stop after the unit has been turned off for 20sec.
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Over heat protection of indoor coil in post-heat
a) If Ti1 ≥ 167ºF, then AUX1 is turned off, indoor fan remains on and runs at high speed.
b) If Ti1 < 158ºF, then AUX1 is turned on, indoor fan remains on and runs at set speed.
c) If the indoor coil temperature sensor is damaged, then the protection mode will be overridden and
the unit will work according to the pre-heat and post-heat program.
DEHUMIDIFICATION MODE
a) MTV1, MTV2, AUX1 and heater are always off.
b) If Tr ≥ 77ºF, then indoor fan and AUX2 will be ON for 3 minutes, and then OFF for 4 minutes.
c) If 60.8ºF ≤ Tr < 77ºF, then indoor fan and AUX2 will be ON for 3 minutes, and then OFF for 6
minutes.
d) If Tr < 60.8ºF, then indoor fan and AUX2 will be turned off for 4 minutes.
e) At the end of the above dehumidification cycle, the system will decide the next dehumidification
control option. Indoor fan will run at low speed throughout the dehumidification process.
AUTOMODE
Not allowed.
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C.5. Control Logics For 4-Pipe System
Note: 4-pipe system must always be equipped with 2 valves.
COOL MODE
a) MTV2, AUX1 and Electrical Heater are always off.
b) If Tr ≥ Ts + 1.8ºF (or + 7.2ºF if economy contact is activated), then cool operation is activated, MTV1 and
AUX2 are turned on. Indoor fan runs at set speed.
c) If Tr < Ts, then cool operation is terminated, MTV1 and AUX2 are turned off. Indoor fan runs at set
speed.
d) The range of Ts is 60.8 - 86ºF
e) Indoor fan speed can be adjusted to low, medium, high and auto.
f) When turned on, MTV1 requires 30 seconds before it is fully open.
g) When turned off, MTV1 requires 120 seconds before it is fully closed.
h) When the unit is turned off, the indoor fan will shut down after 5 seconds.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
a) If Ti1 ≤ 35.6ºF for 2 minutes, then MTV1 and AUX2 are turned off. If indoor fan is set for low speed, then
it will run at medium speed. If it is set at medium or high speed, then it will keep running at the same
speed.
b) If Ti1 ≥ 41ºF for 2 minutes, then MTV1 and AUX2 are turned on. Indoor fan runs at set speed.
FAN MODE
a) Indoor fan runs at the set speed while heater, MTV1, MTV2, AUX1 and AUX2 are turned off.
b) Indoor fan speed can be adjusted to low, medium and high.
HEAT MODE
Without Electrical Heater
a) MTV1, AUX2 and are heater always off.
b) If Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy contact is activated), then heat operation is activated, MTV2 and
AUX1 are turned on. Indoor fan runs at the set speed.
c) If Tr > Ts, then heat operation is terminated, MTV2 and AUX1 are turned off. Indoor fan runs at 200rpm.
d) The range of Ts is 60.8 - 86ºF.
e) Indoor fan speed can be adjusted to low, medium, high and auto.
f) When turned on, MTV2 requires 30 seconds before it is fully open.
g) When turned off, MTV2 requires 120 seconds before it is fully closed.
With Electrical Heater as Booster
a) MTV1 and AUX2 are always off.
b) If Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy contact is activated), then heat operation is activated, MTV2 and
AUX1 are turned on. Indoor fan runs at the set speed.
c) If Tr > Ts, then heat operation is terminated, MTV2 and AUX1 are turned off. Indoor fan runs at 200rpm.
d) If Ti2 < 104ºF, then the electrical heater is turned on. If 104ºF ≤ Ti2 < 113ºF, then the electrical heater
maintains its original state. If Ti2 ≥ 113ºF, then the electrical heater is turned off.
e) The range of Ts is 60.8 - 86ºF
f) Indoor fan speed can be adjusted to low, medium, high and auto.
g) When turned on, MTV2 requires 30 seconds before it is fully open.
h) When turned off, MTV2 requires 120 seconds before it is full closed.
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PRE-HEAT
Without Electrical Heater
a) If Ti2 < 96.8ºF [or 82.4ºF depends on DIP setting], then MTV2 and AUX1 are on, indoor fan remains off.
b) If Ti2 ≥ 100.4ºF [or 86ºF depends on DIP setting], then MTV2 and AUX1 are on, indoor fan runs at set
speed.
c) If indoor coil temperature sensor is damaged, then pre-heat time is set for 2 minutes and indoor fan
runs at set speed.
With Electrical Heater
a) If indoor fan speed ≥ 300 rpm, then the electrical heater is turned on
POST HEAT
Without Electrical Heater
a) If Ti2 ≥ 100.4ºF, then MTV2 and AUX 1 are turned off. Indoor fan continues to run at set speed.
b) If 96.8ºF ≤ Ti2 ≤ 100.4 ºF, then MTV2and AUX1 are turned off. Indoor fan maintains its original state.
c) If Ti2 < 96.8ºF, then MTV2 and AUX1 are turned off. Indoor fan runs at 200 rpm.
d) If the indoor coil temperature coil is damaged, then post-heat time is set for 3 minutes .Indoor fan runs
at set speed.
With Electrical Heater
a) Indoor fan will shut down after the unit has been turned off for 20 seconds.
OVER HEAT PROTECTION OF INDOOR COIL
a) If Ti2 ≥ 167ºF, then MTV2 and AUX1 are turned off, indoor fan remains on and runs at high speed.
b) If Ti2 < 158ºF, then MTV2 and AUX1 are turned on, indoor fan remains on and runs at set speed.
c) If the indoor coil temperature sensor is damaged, then the protection mode will be overridden and the
unit will work according to the pre-heat and post heat set times.
DEHUMIDIFICATION MODE
a) MTV2, AUX1 and heater are always off.
b) If Tr ≥ 77ºF, then MTV1 and AUX2 will be ON for 3 minutes, and then OFF for 4 minutes.
c) If 60.8ºF ≤ Tr < 77ºF, then MTV1 and AUX2 will be ON for 3 minutes, and then OFF for 6 minutes.
d) If Tr < 60.8ºF, then MTV1 and AUX2 will be turned off for 4 minutes.
e) At the end of the above dehumidification cycle, the system will decide the next dehumidification control
option. Indoor fan will run at low speed throughout the dehumidification process.
AUTOMODE
a) If the current running mode is AUTO COOL mode, it will change over to AUTO HEAT mode when all the
following conditions are met:
i. Ts – Tr ≥ 1.8ºF (or - 7.2ºF if economy contact is activated)
ii. MTV1 has closed ≥ 10 min.
b) If the current running mode is AUTO HEAT mode, it will change over to AUTO COOL mode when all the
following conditions are met:
i. Tr – Ts ≥ 1.8ºF (or + 7.2ºF if economy contact is activated)
ii. MTV2 has closed ≥ 10 min.
Note: AUTO COOL or AUTO HEAT operations are the same as COOL or HEAT mode respectively.
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Hour
Sleep on
0.5
1.0
2.0
Sleep off
Set temperature
Ts
Ts+0.9
Ts+1.8
Ts+3.6
Hour
Sleep on
0.5
1.0
2.0
Sleep off
Set temperature
Ts
Ts-3.6
Ts-1.8
Ts-0.9
C.6. Sleep Mode
a) The sleep mode can only be set when the unit is in cool mode or heat mode.
b) If the sleep mode is activated when the unit is in cool mode, then the indoor fan will run at low speed
and Ts will increase by 3.6ºF over 2 hours.
c) If the sleep mode is activated when the unit is in heat mode, then the indoor fan will run at set speed
and Ts will decrease by 3.6ºF over 2 hours.
d) Changing the mode of operation will cancel the sleep mode.
The cool mode sleep profile is:
The heat mode sleep profile is:
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COOL MODE
HEAT MODE
Fan speed cannot change until it has run for more
than 30 seconds.
Fan speed is regulated according to the profile
below.
Fan speed cannot change until it has run for more
than 30 seconds.
Fan speed is regulated according to the profile
below.
Position
Angle against vertical
1
35 º 2 57 º 3 83 º
4
100 º
High
Tr
Low
Low
Medium
Ts
Ts-1.8
Ts-3.6
Ts-5.4
Low
Medium
High
High
Tr
Medium
Low
Low
Ts+5.4
Ts+3.6
Ts+1.8
Ts
High
Medium
Low
C.7. Auto Fan Speed
After 30 seconds the fan speed is modulated according to the difference between the room temperature and
the set temperature. The controller adjusts the motor signal input from 0 to 5VDC by PID calculation every 10
seconds. The air flow is adjusted from 15% to100%.
C.8. Modulating Valve Control Under Energy Saving Mode
If the modulating valve is used, the water flow is adjusted from 0 to 100% according to the room temperature
and set temperature. The controller adjusts the modulating valve signal input from 0 to 10VDC by PID
calculation every 10 seconds.
C.9. Swing / Louver
For remote handset operation
Whenever indoor fan is running, louver can swing or stop at the desired position.
Louver angle: 0~100 º, opens clockwise with widest angle at 100 º.
Swing angle: 35~100 º, opens clockwise to 68º. Below are the 4 fixed positions which can be set from
wireless LCD handset.
For wired wall pad operation
Louver angle: 0~100 º, opens clockwise with widest angle at 100 º.
Swing angle: 35~100 º, opens clockwise to 68º. User may stop louver at any desired poison between
35~100 º.
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WARNING!
If the system is turned off at the circuit breaker (or main power supply), the drain pump will not
work.
NOTE
When button pressing is effective, the master unit buzzer will beep twice and the slave unit will
beep once.
C.10. Buzzer
If a command is received by the air conditioner, the master unit will respond with 2 beeps for each setting,
while the slave unit will respond with 1 beep.
C.11. Auto Restart
The system uses non-volatile memory to save the present operation parameters when system is turned off
or in case of system failure or cessation of power supply. Operation parameters are mode, set
temperature, swing louver’s position, and the fan speed. When power supply resumes or the system is
switched on again, the same operations as previously set will function.
C.12. On/Off Switch On The Front Panel
This is a tactile switch to select Cool→Heat→Off operation mode.
In COOL mode, the set temperature of the system is 75.2ºF with auto fan speed and swing. There are no
timer and sleep modes.
In HEAT mode, the set temperature of the system is 75.2ºF with auto fan speed and swing. There are no
timer and sleep modes.
Master unit that does not use a wall pad will globally broadcast.
C.13. Drain Pump
Drain pump turns ON if the thermostat cuts in activates during cooling or dehumidification cycle. It
remains on for at least 5 minutes after the thermostat cuts out activates. During mode change from
cooling to non cooling mode, water pump will turn on for a minimum of 5 minutes.
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C.14. Float Switch
Float-switch opens before unit is turned on.
If the float switch (N/C) is opened before the unit is turned on, then MTV1 is turned off. The drain pump
and indoor fan will operate. After float switch is closed, MTV1 is turned on.
Float switch is opened, when unit is turned on.
If the float switch is opened continuously ≥ 5 seconds, then the drain pump will work and MTV1 will
remain off. After the float switch is closed, the drain pump will run for an additional 5 minutes. If the float
switch is opened for 10 minutes continuously, then MTV1 will remain off. The indoor fan runs at set speed
and the system reports an error.
Float switch is opened, when unit is turned off.
If the float switch is opened, then the drain pump will work. After the float switch is closed, the drain
pump will run for an additional 5 minutes. If the float switch is opened for 10 minutes continuously,then
the system reports an error.
C.15. Electric Heater Safety Switch
Before the electrical heater is turned on, the EH safety switch must be closed and the fan RPM be more
than 300RPM. If this contact is opened for ≥ 1 second or the fan RPM is less than 300RPM, the heater will
be turned off immediately and report an error. Once the contact is returned to close position ≥ 60 seconds,
reset the error and the heater will start again.
When EH safety switch is opened ≥ 3 times within 60 minutes, the heater is not allowed to start anymore.
Turn off the unit to reset the fault, provided that the switch has returned to the closed position.
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SKUSA-NCGH-001-AECM
Fan speed setting
LED indication
Condition
High speed
Red LED On
Normal
Medium speed
Yellow LED On
Normal
Low speed
Green LED On
Normal
For all units - Green LED
Error Description
Blink
Reason
Remedy
Electrical heater failure
Green LED blinks 1 times,
stops 3 secs
Only for unit with EH.
EH safety switch is
opened.
1. Change fan speed to high.
2. Replace the damaged EH
safety switch.
Indoor coil sensor 2 failure
Green LED blinks 2 times,
stops 3 secs
Ti2 sensor unplugged or
damaged.
1. Check if Ti2 plug is
connected or not.
2. Check if sensor’s resistance
is correct or not.
Return air sensor failure
Green LED blinks 3 times,
stops 3 secs
Room sensor unplugged
or damaged.
1. Check if Tr plug is
connected or not.
2. Check if sensor’s resistance
is correct or not.
Indoor coil sensor 1 failure
Green LED blinks 4 times,
stops 3 secs
Ti1 sensor unplugged or
damaged.
1. Check if Ti1 plug is
connected or not.
2. Check if sensor’s resistance
is correct or not.
Indoor coil low temperature
protection
Green LED blinks 5 times,
stops 3 secs
Water temperature is
lower than 37.4ºF.
Check the water temperature.
Indoor coil over heat
protection
Green LED blinks 6 times,
stops 3 secs
Water temperature is
higher than 158ºF.
Check the water temperature
Water pump failure
Green LED blinks 7 times,
stops 3 secs
Float switch is opened.
1. Check if the condensate
water pipe is connected or
not.
2. Check if the pump is
functioning or not.
EC motor failure
Green LED blinks 9 times,
stops 3 secs
No EC motor feedback
1. Check DIPB-SW5 and SW6
setting.
2. Check the EC motor.
C.16. LED Indication and Error Description
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Master unit LED
Unit No.
Blink
Remedy
Unit 2 failure
RED LED blinks 2 times, stop 3 sec
Check unit 2 communication plug and fix it
Unit 3 failure
RED LED blinks 3 times, stop 3 sec
Check unit 3 communication plug and fix it
Unit 4 failure
RED LED blinks 4 times, stop 3 sec
Check unit 4 communication plug and fix it
Unit 5 failure
RED LED blinks 5 times, stop 3 sec
Check unit 5 communication plug and fix it
Unit 6 failure
RED LED blinks 6 times, stop 3 sec
Check unit 6 communication plug and fix it
Unit 7 failure
RED LED blinks 7 times, stop 3 sec
Check unit 7 communication plug and fix it
Unit 8 failure
RED LED blinks 8 times, stop 3 sec
Check unit 8 communication plug and fix it
Unit 9 failure
RED LED blinks 9 times, stop 3 sec
Check unit 9 communication plug and fix it
Unit 10 failure
RED LED blinks 10 times, stop 3 sec
Check unit 10 communication plug and fix it
Unit 11 failure
RED LED blinks 11 times, stop 3 sec
Check unit 11 communication plug and fix it
Unit 12 failure
RED LED blinks 12 times, stop 3 sec
Check unit 12 communication plug and fix it
Unit 13 failure
RED LED blinks 13 times, stop 3 sec
Check unit 13 communication plug and fix it
Unit 14 failure
RED LED blinks 14 times, stop 3 sec
Check unit 14 communication plug and fix it
Unit 15 failure
RED LED blinks 15 times, stop 3 sec
Check unit 15 communication plug and fix it
Unit 16 failure
RED LED blinks 16 times, stop 3 sec
Check unit 16 communication plug and fix it
Unit 17 failure
RED LED blinks 17 times, stop 3 sec
Check unit 17 communication plug and fix it
Unit 18 failure
RED LED blinks 18 times, stop 3 sec
Check unit 18 communication plug and fix it
Unit 19 failure
RED LED blinks 19 times, stop 3 sec
Check unit 19 communication plug and fix it
Unit 20 failure
RED LED blinks 20 times, stop 3 sec
Check unit 20 communication plug and fix it
Unit 21 failure
RED LED blinks 21 times, stop 3 sec
Check unit 21 communication plug and fix it
Unit 22 failure
RED LED blinks 22 times, stop 3 sec
Check unit 22 communication plug and fix it
Unit 23 failure
RED LED blinks 23 times, stop 3 sec
Check unit 23 communication plug and fix it
Unit 24 failure
RED LED blinks 24 times, stop 3 sec
Check unit 24 communication plug and fix it
Unit 25 failure
RED LED blinks 25 times, stop 3 sec
Check unit 25 communication plug and fix it
Unit 26 failure
RED LED blinks 26 times, stop 3 sec
Check unit 26 communication plug and fix it
Unit 27 failure
RED LED blinks 27 times, stop 3 sec
Check unit 27 communication plug and fix it
Unit 28 failure
RED LED blinks 28 times, stop 3 sec
Check unit 28 communication plug and fix it
Unit 29 failure
RED LED blinks 29 times, stop 3 sec
Check unit 29 communication plug and fix it
Unit 30 failure
RED LED blinks 30 times, stop 3 sec
Check unit 30 communication plug and fix it
Unit 31 failure
RED LED blinks 31 times, stop 3 sec
Check unit 31 communication plug and fix it
Unit 32 failure
RED LED blinks 32 times, stop 3 sec
Check unit 32 communication plug and fix it
C.17. LED indication on Master/Slave connection
For master unit indicating defect status of all slave units. Error message can be found in LED lights on master unit.
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D. Networking System
D.1. Master-Slave Network
The control PCB can be set either as a master unit or slave unit.
MASTER UNIT FUNCTION
a) The master unit sends data regarding its setting to the slave unit.
b) The master unit settings are Unit ON/OFF, Mode, Fan Speed, Timer, Clock, Set Temperature, Swing Function,
and Sleep Function for handset operation.
c) The master unit settings are Unit ON/OFF, Mode, Fan Speed, Timer, Clock, Set Temperature, Swing Function,
and Sleep Function for wall pad operation.
SLAVE UNIT FUNCTION
a) The slave unit receives data regarding its settings from the master unit.
b) The slave unit is allowed to change to a locally desired setting by local controller as long as there are no
subsequent changes to the settings of the master unit.
c) The slave units can be set individually for timer on/off function by handset or wall pad. The handset cannot
override the wall pad timer and clock setting.
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First unit
Middle unit
Last unit
D.1.1. Master – Slave Network Setup
1) Disconnect the communication plug from the SKUSA-NCGH-001-AECM
2) Communication plug
A, B, A, B is printed on the main PCB. When you connect the wires, please ensure connection of A to A and B to B.
3) Connection wire
3.1) If the total length of wire is more than 3280.9ft, please use shielded wire in order to protect the signal
transmission.
3.2) Complete wire connection
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1st
contact
2nd
contact
3rd
contact
4th
contact
5th
contact
6th
contact
First unit
Middle unit
Last unit
3.3) Wire connection check
3.3.1) After the wire connection is completed, please check the wire colours correspond.
3.3.2) Check the wire contact by using a multimeter.
3.3.3) Check 1 and 2, 3 and 4, 5 and 6 to be sure the connections are correct.
3.3.4) If the resistance between two wire contacts is too high, please check and reconnect the wire contacts.
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4) Reconnect the communication plug to the control box
Using Remote Control Handset to Set Master Control Unit:
a) Connect all the units PCBs according to the wire color and type of connector.
b) Select the master unit by setting DIPA-S1 SW6 to ON (=1) in the PCB.
c) Ensure the DIPA-S1 SW6 is set to OFF (=0) in the PCB on each slave unit.
d) Switch on the units by connecting the main power supply.
e) Using the handset, set the operation parameters for the Master unit which will automatically send the
settings to the slave unit.
f) Master unit will beep twice confirming receipt of commands while Slave unit will beep once.
Using Wall pad to Set Master Control Unit:
a) Connect all the units PCBs according to the wire color and type of connector.
b) Select the master unit by setting DIPA-S1 SW6 to ON (=1) in the PCB.
c) Ensure the DIPA-S1 SW6 is set to OFF (=0) in the PCB on each slave unit.
d) Provide each slave unit an addressable code by configuring SW1 – SW5 of DIPA-S1 according to the DIP
switch setting table.
e) Switch on the units by connecting the main power supply.
f) Using the wall pad, set the operation parameters for the Master unit which will send the setting to the slave
units based on Global-control communication or Addressable communication methods.
g) Master unit will beep twice confirming receipt of commands while Slave unit will beep once.
MASTER-SLAVE CONTROL
The control PCB can receive data from both wireless LCD handset and wired wall pad.
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DIPA-S1
SW6
DIPA-S1
SW5
DIPA-S1
SW4
DIPA-S1
SW3
DIPA-S1
SW2
DIPA-S1
SW1
Unit No.
Remark
1 0 0 0 0 0 01
Master
0 0 0 0 0 1 02
Slave
0 0 0 0 1 0 03
Slave
0 0 0 0 1 1 04
Slave
0 0 0 1 0 0 05
Slave 0 0 0 1 0 1
06
Slave 0 0 0 1 1 0
07
Slave
0 0 0 1 1 1 08
Slave 0 0 1 0 0 0
09
Slave 0 0 1 0 0 1
10
Slave
0 0 1 0 1 0 11
Slave 0 0 1 0 1 1
12
Slave 0 0 1 1 0 0
13
Slave 0 0 1 1 0 1
14
Slave 0 0 1 1 1 0
15
Slave 0 0 1 1 1 1
16
Slave
0 1 0 0 0 0 17
Slave 0 1 0 0 0 1
18
Slave 0 1 0 0 1 0
19
Slave
0 1 0 0 1 1 20
Slave 0 1 0 1 0 0
21
Slave 0 1 0 1 0 1
22
Slave 0 1 0 1 1 0
23
Slave 0 1 0 1 1 1
24
Slave 0 1 1 0 0 0
25
Slave 0 1 1 0 0 1
26
Slave
0 1 1 0 1 0 27
Slave 0 1 1 0 1 1
28
Slave
0 1 1 1 0 0 29
Slave 0 1 1 1 0 1
30
Slave 0 1 1 1 1 0
31
Slave 0 1 1 1 1 1
32
Slave
D.1.2. Master-Slave Communication Method
There are two modes for Master-slave structure.
Global Control communication
The Master unit will broadcast the settings to all slave units. During normal operation, slave units can receive
commands from its local wireless handset and wall pad control panel. Upon reception of master global
commands, all slave unit settings will be replaced by the master settings.
Addressable communication
The Master controller must be the LCD wall pad. Slave unit parameters are set as usual. Upon receiving the
control commands from a master, the addressed slave unit settings will be replaced by the master settings.
DIPA-S1 address setting: ON=1, OFF=0.
If master unit is equipped with wireless handset only, it can only use Global-Control communication method. If it
is equipped with wall pad, it can use both communication methods.
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Function Code
Function Description
01(01H)
Read Coils
02(02H)
Read Discrete Inputs
03(03H)
Read Holding Registers
04(04H)
Read Input Registers
05(05H)
Write Single Coil
06(06H)
Write Single Register
15(0FH)
Write Multiple Coils
16(10H)
Write Multiple Registers
255(FFH)
Extended Commands which is used to test
Error code
Description
Definition
01 (01H)
Invalid commands
Received commands beyond valid commands
02 (02H)
Invalid data address
Data addresses beyond valid data address
03 (03H)
Invalid data
Data beyond definition range
04 (04H)
Write data not successful
Write data did not succeed
D.2. Open Modbus protocol
Transfer Mode: RTU, BAUD Rate: 9600bps, 8 data bit, 1 stop bit, None parity bit
The communications require a delay of 80ms between reading an answer and sending the next command. All
temperature is equal to reading data*10 accuracy: 0.18 °F.
Supported Functions:
Valid Error code table:
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Description
Address
Type*
Remark
Unit ON/OFF
100000
R/W
Sleep mode
100001
R/W
Louver swing
100002
R/W
Reserved
100003
Reserved
100004
Reserved
100005
Reserved
100006
Reserved
100007
Reserved
100008
Reserved
100009
Reserved
100010
Reserved
100011
Reserved
100012
Reserved
100013
Reserved
100014
Reserved
100015
Description
Address
Type*
Remark
MTV1
200000
R MTV2
200001
R
AUX1
200002
R AUX2
200003
R Condensate pump
200004
R Electrical heater
200005
R Wired wall pad
200006
R PRO
200007
R Float switch
200008
R Reserved
200009
R EH protection switch
200010
R
Internal actually running
and unit
Unit ON/OFF
200011
R
Testing purpose only.
Coils table:
* R = read only, W = write only, R/W = read and write.
Discrete table:
* R = read only, W = write only, R/W = read and write.
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Description
Address
Type*
Remark
Mode setting
300000
R/W
Cooling mode = 01(H)
Humidify mode = 02(H)
Fan mode = 04(H)
Heating mode = 08(H)
Auto mode = 10(H)
Fan speed setting
300001
R/W
Low speed = 04(H)
Medium speed = 02(H)
High speed = 01(H)
Auto fan speed = 07(H)
Louver swing setting
300002
R/W
Position 1 = 01(H)
Position 2 = 02(H)
Position 3 = 03(H)
Position 4 = 04(H)
Auto = 0F(H)
Stop = 00(H)
Setting temperature
300003
R/W
60.8~86°F (actual*10 format)
Address setting
300004
R
Set by dip-switch, reading only
Reset
300005
W
=0x33 reset error
Week
300006
W
Calibration wired wall pad and set timer function
Hour
300007
W
Calibration wired wall pad and set timer function
Minute
300008
W
Calibration wired wall pad and set timer function
Second
300009
W
Calibration wired wall pad and set timer function
Hours in Timer on
300010
R/W
Timer ON
Minute in Timer on
300011
R/W
Timer ON
Hours in Timer off
300012
R/W
Timer OFF
Minute in Timer off
300013
R/W
Timer OFF
Icon of Timer ON or OFF
300014
R/W
BIT0 = Icon of Timer ON
BIT1 = Icon of Timer OFF
1 = enable
0 = disable
Super low speed rpm
310000
R/W
200~1500
Low speed rpm
310001
R/W
200~1500
Medium speed rpm
310002
R/W
200~1500
High speed rpm
310003
R/W
200~1500
RPM setting
310004
R/W
0~2000 (used to test，0 = disable)
Temperature sampling time
310005
R/W
2~100, default:5S
Factor of auto fan speed
310006
R/W
2~150, default:20
Factor of modulating valve
310007
R/W
2~250, default:150
Holding Register table:
* R = read only, W = write only, R/W = read and write.
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Description
Address
Type*
Remark
Dip switch 1 status
400000
R
Dip switch 2 status
400001
R Room temperature sensor
400002
R Ti1 temperature sensor
400003
R Ti2 temperature sensor
400004
R
Error code
400005
R
Bit0 = Room temperature sensor error
Bit1 = Ti1 temperature sensor error
Bit2 = Ti2 temperature sensor error
Bit3 = Float switch error
Bit4 = Indoor coil low temperature protection
Bit5 = Indoor coil over heat protection
Bit6 = Reserved
Bit7 = Electrical heater failure
Bit8 = Motor1 Error
Bit9 = Motor2 Error
Bit10 = System parameters error
Bit11 = Reserved
Bit12 = Reserved
Bit13 = Reserved
Bit14 = Reserved
Bit15 = Reserved
Fan speed status
400006
R
Low = 04(H)
Medium = 02(H)
High = 01(H)
Mode status
400007
R
Cooling mode = 01(H)
Dehumidify mode = 02(H)
Fan mode = 04(H)
Heating = 08(H)
Setting temperature status
400008
R
Testing only
Room temperature in wall
pad status
400009
R
Room temperature in
main PCB status
400010
R Unit type
400011
R
4-pipe = 03, 2-pipe = 02
This setting is configured by dip switch
EC motor 1# RPM
400012
R EC motor 2# RPM
400013
R
Input Register table:
* R = read only, W = write only, R/W = read and write.
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I/O
Code
2-Pipe
4-Pipe
Analogue input
Coil temperature sensor
AI1
Cooling / heating coil sensor
(Ti1)
Cooling only coil sensor
(Ti1)
Voltage input
High fan speed
H
24VAC input signals from wired thermostat
Medium fan speed
M
Low fan speed
L
Phase
L
External 220VAC or 115VAC power supply connection to
the PCB. Max length: 16.4ft
Neutral
N
Earth
GND
Auto ON/OFF
AUTO
230VAC input signal from wired thermostat, activates
modulating control mode
Signal Input
Modulating signal
+/-
Low voltage modulating signal input (standard 0~5VDC;
optional 0~10VDC)
Digital input
Programming interface
TTL
Low voltage digital signal input for board programming
Float switch
Float
Voltage-free (NC)
Voltage output
Water pump
WP
Voltage output (L)
EC motor
CN4
5-wire connection with 230VAC power supply to EC motor
and 0-5VDC modulating signal output
Stepping motor
CN1-2
Low-voltage output
Digital output
LED display
X-DIS
Low-voltage output
Voltage-free output
Alarm
Voltage-free alarm contact:
(a) Standard configuration is (NC).
E. Control Specifications: SKUSA-NCGH-002/003-AECM
Used in all PCG/PCH [V/P] W unit configurations.
Limited function controller, compatible with 24VAC wired thermostat controller, with zone control functionality.
SKUSA-NCGH-002-AECM is used for PCG/PCH without electrical heater.
SKUSA-NCGH-003-AECM is used for PCG/PCH with electrical heater.
E.1. Features
a. Condensate management with valve protection and NC alarm contact.
b. Integrated fan relays for zone control applications.
c. ON/OFF thermostat input and low-voltage modulating fan speed input flexibility.
d. Simple error diagnostic and LED error display.
Ti1 = Chilled water coil temperature
E.2. I/O Port Definitions
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Code
State
Description
S1
Open
PCB configured for 0~5VDC modulating signal input.
S1
Closed
PCB configured for 0~10VDC modulating signal input.
S3
N/A
Reserved
S4
N/A
Reserved
E.3. Onboard configuration
The PCB can be configured for different modulating signal inputs.
Refer to jumper configuration table below.
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RELAY
RELAY
BLDC
EC MOTOR
HV
Gnd
Vcc
Vsp
FG
FLOAT
FLOAT
N2
Pump
JP2
float control switch for pump
PUMP
RELAY
CPU
SM1
SM2
CN
2
AI1
NC
JP3
CN
4
X-DIS
TTL
L M H AUTO N
+
-
Y1 W1
G G0 G1
C
L1
L2
BK
BL
YL/GR
YL
BR
OR
Cooling valve signal
L
N
Heating valve signal
Max speed
signal
Med speed
signal
Low speed
signal
220V
/1Ph
~
Alarm signal
Unit wiring scheme
N1 L
CN1
ALARM
UH1
ALARM:Pump failure ,it's opened.
PUMP:Water pump output
CN1,CN2:Stepping motor
CN4:EC motor output
S1
24VAC common
Wring connections to thermastat
24VAC
signal input
~220V
~110V
R
~24
V
GN
PRIMARY
SECONDARY
24VAC
BL
110V
/1Ph
~
E.4. Wiring Diagrams
E.4.1. SKUSA-NCGH-002-AECM
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
RELAY
RELAY
BLDC
EC MOTOR
HV
Gnd
Vcc
Vsp
FG
FLOAT
FLOAT
N2
Pump
JP2
float control switch for pump
PUMP
RELAY
CPU
SM1
SM2
CN
2
AI1
NC
JP3
CN
4
X-DIS
TTL
L M H AUTO N
+
-
Y1 W1
G G0 G1
C
L1
L2
BK
BL
YL/GR
YL
BR
OR
Cooling valve signal
L
N
Electrical heater signal
Max speed
signal
Med speed
signal
Low speed
signal
220V
/
1
Ph
~
Alarm signal
Unit wiring scheme
N1 L
CN1
ALARM
UH1
ALARM:Pump failure ,it's opened.
PUMP:Water pump output
CN1,CN2:Stepping motor
CN4:EC motor output
S1
24VAC common
Wring connections to thermastat
24VAC
signal input
~220V
~110V
R
~24
V
GN
PRIMARY
SECONDARY
24VAC
RL~24V
BL
1
1
0V
/
1
Ph
~
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E.4.2. SKUSA-NCGH-003-AECM
Page 79 of 98
Page 80 of 98
E.4.3. Zone control wiring diagram 1 (ON/OFF thermostat)
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E.4.4. Zone control wiring diagram 2 (Modulating signal thermostat)
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E.5. Control logic specification
E.5.1. Unit power ON/OFF
i. The unit is turned ON when any of the fan speed inputs (H/M/L) are ON, OR Auto ON/OFF signal
input is ON.
ii. The unit is turned OFF only if all of the fan speed inputs (H/M/L) are OFF AND Auto ON/OFF signal
input is OFF.
E.5.2. Alarm protection and error display
i. If the float switch is open for 5 minutes, then the (NC) voltage-free alarm contact shall be open, and
the (NO) voltage free alarm contact shall be closed.
ii. If the float switch is open for 10 minutes, the LED display reports a condensate management failure
(see section LED Indication and Error Description below).
E.5.3. Drain-pump run management
i. When the unit turns ON:
a) if Ti1 < 59ºF, the drain pump turns ON.
b) If Ti1 ≥ 59ºF, the drain pump turns OFF.
ii. When the unit turns OFF and the drain pump is ON:
the dain pump will remain ON for 5 minutes, before the drain pump turns OFF.
iii. At any time:
a) if the float switch is OPEN, the drain pump will turn ON.
b) if the float switch is OPEN and then CLOSES, the drain pump will remain ON for 5 minutes, and then
turn OFF.
E.5.4. Swing and louver control
i. When the unit is OFF, the louvers are closed (angle at 100º against vertical).
ii. When the unit turns ON, the louvers open (angle at 87º against the horizontal).
iii. When the unit turns OFF, the louver returns to a closed position (100º against the vertical).
E.5.5. Modulating signal input
i. When the “Auto ON/OFF” 230VAC input is ON, the fan motor rpm speed shall be modulated by the
“+/-” low voltage modulating signal input.
ii. The standard configuration is for 0~5VDC modulating signal input.
iii. The optional configuration is for 0~10VDC modulating signal. To set the PCB to the optional
configuration, the S1 jumper must be closed.
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SKUSA-NCGH-002/003-AECM
Fan speed setting
LED indication
Condition
High speed
Red LED On
Normal
Medium speed
Yellow LED On
Normal
Low speed
Green LED On
Normal
For all units - Green LED blinks
Item
Blink
Reason
Remedy
Indoor coil sensor 1 failure
Green LED blinks 4 times,
stops 3 secs
Ti1 sensor connection is
not good or damaged.
1. Check if Ti1 plug is
connected or not.
2. Check if sensor’s resistor is
correct or not.
Water pump failure
Green LED blinks 7 times,
stops 3 secs
Float switch is opened..
1. Check if the condensate
water pipe is connected or
not.
2. Check if the pump is
functioning or not.
EC motor failure
Green LED blinks 9 times,
stops 3 secs
No EC motor feedback
1. Check DIPB-SW5 and SW6
setting.
2. Check the EC motor
E.6. LED Indication and Error Description
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Attention
When unit with handset is the master unit, settings
are automatically sent to the slave unit;
Auto Cool-Heat operation will be applicable in 4-pipe
system only.
“Swing” function is not applicable.
F. User Interface
F.1. Remote Handset
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F.2. Wired Wall Pad
Page 85 of 98
Attention
Wall pad will recognize the main board model automatically whether it is 2-pipe or 4-pipe system.
Auto Cool-Heat operation is applicable in 4-pipe system only.
When the wall pad is installed, the wall-pad temperature sensor automatically overrides the default return air sensor (attached to the unit’s return air grille).
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TIME
TIME
DAY
TIMER
TIME
TIME
CANCEL
DAY
TIMER
OFF
TIMER
OFF
CANCEL
NET
TIME
TIME
TIMER
DAY
TIME
TIME
F.2.1. Wall Pad Operation Guidelines
a) Clock display and setting
System has an accurate internal real time clock used for time indication and timer ON/OFF function. Clock display
area indicates internal time clock which can be set by
b) Day display and setting
The wall pad has a day display function which is used for day indication and timer ON/OFF function. Day display icon
indicates current day. Press
c) Timer ON/OFF setting
If the master unit is in global control mode and the ON/OFF timer setting is selected, the master unit will command
the whole network to be on or off. Otherwise the ON/OFF timer is effective for the local unit only. The system
supports individual ON/OFF timer settings for each day of the week.
Press
day display area indicates which day the timer is being set for. If there is no preset ON timer, the timer
display area shows , otherwise the previous setting will be shown. Press
change the ON timer setting. Press
or
button.
button to set day.
button once, and ON symbol blinking indicates ON timer programming mode. The
or
button to
key to cancel the current ON timer setting and the timer
display area will show . Press
programmed for.
Press
button again, and
The setting method is the same as the ON timer setting above.
Press
button again, to exit the ON/OFF timer setting function.
Should there be any ON or OFF timer settings programmed, will light up. Should there be any
unexecuted ON or OFF timer settings for the current day, its corresponding ON or
Hold down
d) Timer set by master unit is as follows:
Press
button to enter into networking control mode. Unit area blinking indicates the slave unit
under control. Press
automatically.
Press
button once to enter into ON timer programming mode. Press
required day of the week. Master unit will then retrieve the setting from the selected slave unit and the
timer display area will show “rEAd”. The ON timer setting will be shown upon reading the data successfully.
button to change the day the ON timer is to be
symbol blinking indicates OFF timer programming mode.
button for 3 seconds to cancel all timer settings.
or
to select the desired slave unit. Units that are off will be skipped
icon will light up.
button to select the
Press
or
button to change the ON timer setting of the slave unit.
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 87 of 98
TIMER
DAY
TIME
TIME
TIMER
CANCEL
TIME
TIME
SLEEP
FAN
MODE
Press
button again to enter into OFF timer programming mode. Press
required day of the week. Master unit will then retrieve the setting from the selected slave unit and timer
the display area will show “rEAd”. The OFF timer setting will be shown upon reading the data successfully.
Press
or
button to change the OFF timer setting of the slave unit.
Upon completion of changing timer settings for the selected day, press
programming mode. The settings will then upload to the selected slave unit. The next day of the week
settings can be done only upon completion of sending data to the slave units. (Repeat steps 1~4 if setting
is required for the next day of the week).
In Global control mode:
Pressing Master
Timer settings will be broadcast to all slave units.
e) Clock synchronization by master unit is as follows:
Press
and
buttons for 3 seconds to activate clock synchronization to all slave units. Master wall
pad will respond with a beeping sound.
f) Key lock
button to select the
button again to exit timer
button for 3 seconds will cancel all timer settings in all slave units.
In order to prevent unauthorized access to the system setting, a key lock function is provided. Hold down
and for 3 seconds to activate key lock, symbol lights up. Repeat the same to exit key lock. Only
g) Swing
Not applicable.
h) Sleep
Press
only.
i) Temperature setting
Press or to enter into temperature setting mode, temperature display area blinks indicating the
current set temperature. Press the above buttons to adjust the set temperature.
j) Mode setting
button is applicable in key lock mode.
button to activate or deactivate sleep setting. The Sleep function is valid in cool or heat modes
Press button to change the operation mode.
k) Fan speed setting
Press
l) On/Off control
button to change the fan speed. Only low speed is available for dehumidification mode.
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 88 of 98
NET
TIME
TIME
NET
SWING
FRESH
CANCEL
FAN
Wall pad display temperature area
Wall pad display time area
C0
Return air temperature displayed
C1
Indoor coil temperature displayed
C2
DIP switch setting displayed
C3
Indoor coil 2 temperature
CANCEL
Error
Error code
Electrical heater faulty
E1
Indoor coil sensor 2 faulty
E2
Return air sensor faulty
E3
Indoor coil sensor 1 faulty
E4
Indoor coil low temperature protection
E5
Indoor coil over heat protection
E6
Float switch alarm
E7
Local communication error
E8
Press to start or stop the unit.
m) Networking Master - Slave Control (only master unit wall pad can control other units on the network)
Press
under control. Press
automatically. Parameters that can be controlled are on/off, timer weekly program, set temperature, mode,
fan speed, swing and sleep. Parameter operation methods are the same as above. Press
again to exit networking control mode.
Hold down
Repeat the same to exit global control mode. In global control mode, the settings of the master unit will be
broadcast to all the slave units.
n) Unit operation parameters browsing
Hold down
Unit’s display area shows the slave unit under browsing. Slave unit selection method is the same as in
networking control above. Press or to browse various parameters as follow:
button to enter into networking control mode. Unit address blinking indicates the slave unit
and
and
or
buttons for 3 seconds to enter into operation parameters browsing mode.
to select the desired slave unit; Units that are off will be bypassed
button
buttons for 3 seconds to enter into global control mode, lights up.
Press
o) Error indication
When faulty slave unit is detected, the Master unit’s display area shows the faulty unit address, the time area
shows the error code and the wall pad backlight changes to the color red . Should there be multiple units having
problems, addresses and error codes will be shown one after another.
Error code definition:
button to exit.
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 89 of 98
Model
High
Medium
Low
PCG-04
570
450
250
PCG-08
800
560
250
PCG-09
570
450
250
PCG-16
800
560
250
PCH-12
780
540
350
PCH-20
930
650
400
This is the motor RPM setting.
Press TEMP. + / - button to increase the RPM
setting by 10RPM step.
This is the speed level setting.
d0 means low speed
d1 means medium speed
d2 means high speed
Press PARAMETER + / - button to select.
F.2.2. EC unit RPM setting
1) Turn OFF the unit.
2) Open wall pad’s back cover, where two DIP switches can be seen.
3) Turn the DIP switch 1 to “ON” position.
4) Wired wall pad LCD will display the following;
5) After finishing the RPM setting, turn the DIP switch 1 to “OFF” position. The Wired wall pad display will resume
its normal appearance.
Table for RPM setting for each models:
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 90 of 98
T
Rmin
Rnom
Rmax
T
Rmin
Rnom
Rmax
(°F)
(KΩ)
(KΩ)
(KΩ)
(°F)
(KΩ)
(KΩ)
(KΩ)
-22
174
182.7
191.8
39.2
26.11
26.9
27.71
-20.2
163.4
171.5
179.9
41
24.85
25.59
26.34
-18.4
153.6
161.1
168.9
42.8
23.65
24.35
25.05
-16.6
144.4
151.3
158.5
44.6
22.52
23.17
23.83
-14.8
135.8
142.2
148.9
46.4
21.45
22.06
22.68
-13
127.8
133.8
140
48.2
20.44
21.01
21.59
-11.2
120.3
125.8
131.6
50
19.48
20.02
20.55
-9.4
113.3
118.4
123.8
51.8
18.58
19.7
19.58
-7.6
106.7
111.5
116.5
53.6
17.71
18.18
18.65
-5.8
100.6
105.1
109.7
55.4
16.9
17.33
17.77
-4
94.9
99.03
103.3
57.2
16.12
16.53
16.94
-2.2
89.51
93.39
97.41
59
15.39
15.77
16.16
-0.4
84.5
88.11
91.85
60.8
14.69
15.05
15.41
1.4
79.8
83.17
86.64
62.6
14.03
14.37
14.7
3.2
75.39
78.53
81.76
64.4
13.41
13.72
14.03
5
71.26
74.18
77.19
66.2
12.81
13.1
13.4
6.8
67.37
70.1
72.9
68
12.24
12.52
12.79
8.6
63.73
66.26
68.88
69.8
11.7
11.96
12.22
10.4
60.3
62.67
65.1
71.6
11.19
11.43
11.67
12.2
57.08
59.28
61.55
73.4
10.71
10.93
11.15
14
54.05
56.1
58.22
75.2
10.24
10.45
10.66
15.8
51.19
53.12
55.08
77
9.8
10
10.2
17.6
48.51
50.3
52.14
78.8
9.374
9.57
9.765
19.4
45.98
47.66
49.37
80.6
8.969
9.16
9.351
21.2
43.61
45.17
46.77
82.4
8.584
8.77
8.957
23
41.36
42.82
44.31
84.2
8.218
8.4
8.582
24.8
39.25
40.61
42
86
7.869
8.047
8.225
26.6
37.26
38.53
39.83
87.8
7.537
7.71
7.885
28.4
35.38
36.56
37.78
89.6
7.221
7.39
7.56
30.2
33.6
34.71
35.85
91.4
6.92
7.085
7.251
32
31.93
32.97
3402
93.2
6.633
6.794
6.956
33.8
30.35
31.32
32.3
95
6.36
6.517
6.675
35.6
28.85
29.76
30.68
96.8
6.099
6.252
6.407
37.4
27.44
28.29
29.15
98.6
5.85
6
6.151
G. Sensor Resistance R-T Conversion Table
Resistance : R (77°F) = 10KΩ ± 1%
Beta Constant : B (25/85) = 3977 ± 1%
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 91 of 98
T
Rmin
Rnom
Rmax
T
Rmin
Rnom
Rmax
(°F)
(KΩ)
(KΩ)
(KΩ)
(°F)
(KΩ)
(KΩ)
(KΩ)
100.4
5.614
5.759
5.907
167
1.417
1.474
1.532
102.2
5.387
5.53
5.673
168.8
1.37
1.426
1.482
104
5.172
5.31
5.451
170.6
1.326
1.379
1.434
105.8
4.966
5.101
5.238
172.4
1.282
1.335
1.389
107.6
4.769
4.901
5.034
174.2
1.241
1.292
1.344
109.4
4.582
4.71
4.84
176
1.201
1.25
1.302
111.2
4.402
4.527
4.654
177.8
1.162
1.211
1.261
113
4.231
4.353
4.477
179.6
1.125
1.172
1.221
114.8
4.067
4.186
4.307
181.4
1.089
1.135
1.183
116.6
3.911
4.027
4.144
183.2
1.055
1.1
1.146
118.4
3.761
3.874
3.989
185
1.021
1.065
1.111
120.2
3.618
3.728
3.84
186.8
0.9891
1.032
1.077
122
3.481
3.588
3.697
188.6
0.9582
1
1.044
123.8
3.35
3.454
3.561
190.4
0.9284
0.9697
1.012
125.6
3.225
3.326
3.43
192.2
0.8998
0.9401
0.9818
127.4
3.105
3.204
3.305
194
0.8721
0.9115
0.9522
129.2
2.99
3.086
3.185
195.8
0.8455
0.8839
0.9237
131
2.88
2.974
3.07
197.6
0.8198
0.8573
0.8961
132.8
2.774
2.866
2.959
199.4
0.795
0.8316
0.8696
134.6
2.673
2.762
2.854
201.2
0.7711
0.8069
0.8439
136.4
2.576
2.663
2.752
203
0.748
0.783
0.8192
138.2
2.483
2.568
2.655
204.8
0.7258
0.7599
0.7953
140
2.394
2.477
2.562
206.6
0.7043
0.7376
0.7722
141.8
2.309
2.39
2.472
208.4
0.6836
0.7161
0.7499
143.6
2.227
2.306
2.386
210.2
0.6635
0.6953
0.7283
145.4
2.149
2.225
2.304
212
0.6442
0.6752
0.7075
147.2
2.073
2.148
2.224
213.8
0.6255
0.6558
0.6874
149
2.001
2.074
2.148
215.6
0.6075
0.6371
0.6679
150.8
1.931
2.002
2.075
217.4
0.59
0.619
0.6491
152.6
1.865
1.934
2.005
219.2
0.5732
0.6015
0.631
154.4
1.801
1.868
1.937
221
0.5569
0.5846
0.6134
156.2
1.739
1.805
1.872
158
1.68
1.744
1.81
159.8
1.623
1.686
1.75
161.6
1.569
1.63
1.692
163.4
1.516
1.576
1.637
165.2
1.466
1.524
1.583
Resistance : R (77°F) = 10KΩ ± 1%
Beta Constant : B (25/85) = 3977 ± 1%
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 92 of 98
Symptoms
Cause
Remedy
The fan coil does
not start up
No voltage
Mains switch in the “OFF
position
Faulty room control
Faulty fan
- Check for presence of voltage
- Check fuse on board
- Place in the “ON” position
- Check the room control
- Check fan motor
Filter clogged
Air flow obstructed
Room control regulation
Incorrect water temperature
Air present
Insufficient output
- Clean the filter
- Remove obstacles
- Check the room air sensor
- Check the water source
- Check the air vent
Contact between metal parts
Loose screws
Noise and
vibrations
- Check for loosening parts
- Tighten screws
H. Troubleshooting Guide
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 93 of 98
I. Exploded Diagrams & Sub-assembly Descriptions
I.1. Exploded View for Single Fan Model
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 94 of 98
Item
Description
QTY
Item
Description
QTY
1
Casing
1
6
Mounting fixture
1
2
Coil 1 6-1
Room sensor
1
2-1
Chilled water coil sensor
1
7
Finger guard
1
2-2
Hot water coil sensor
1
7-1
Venturi
1
3
EC Motor
1
8
Drain pan
1
4
Fan blower
1
9
External drain pan
1
5
Front panel
1
10
Pump system
1
5-1
Front cover
1
10-1
Pump
1
5-2
Louver
4
10-2
Flow switch
1
5-3
IR receiver
1
10-3
Pump pipe-1
1
5-4
Stepping motor
2
10-4
Check valve
1
5-5
Stepping motor
2
10-5
Pump pipe-2
1
5-6
Grille
1
10-6
Drainage head
1
5-7
Filter 1
I.1.1. Spare Parts Of Single Fan Model
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 95 of 98
I.2. Exploded View for Twin Fan Model
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 96 of 98
Item
Description
QTY
Item
Description
QTY
1
Casing
1
6
Mounting fixture
1
2
Coil 1 6-1
Room sensor
1
2-1
Chilled water coil sensor
1
7
Finger guard
2
2-2
Hot water coil sensor
1
7-1
Venturi
2
3
EC Motor
2
8
Drain pan
1
4
Fan blower
2
9
External drain pan
1
5
Front panel
1
10
Pump system
1
5-1
Front cover
1
10-1
Pump
1
5-2
Louver
6
10-2
Flow switch
1
5-3
IR receiver
1
10-3
Pump pipe-1
1
5-4
Stepping motor
2
10-4
Check valve
1
5-5
Stepping motor
2
10-5
Pump pipe-2
1
5-6
Grille
2
10-6
Drainage head
1
5-7
Filter 2
11-Plug-and-play control box
Item
Code
Description
QTY
11-1
SKUSA-NCGH-001-AECM
Plug-and-play control box
1
11-1-1
SK04-ST-KM(H)-001-02
Communication plug HMCST-CJ
1
11-1-2
SK04-ST-KM(H)-EC-003
EC main PCB DCST-SP
1
11-1-3
SK06-KMH-002
Control box base FP-KM4(6)-H-601
1
11-1-4
SK06-KMH-003
Control box cover FP-KM4(6)-H-602
1
11-1-5
SK06-KMH-004
Terminal cover FP-KM4(6)-H-603
1
11-1-6
SK06-KMH-005
Wires protection hole FP-KM4(6)-H-603/1
1
11-1-7
SK08-TB-010
Terminal block JX0-B9-1
1
11-1-8
SK10-EC-XS-ST-KMH-001
Wires cable DCST-KM4(6)H
1
Item
Code
Description
QTY
11-2
SKUSA-NCGH-002-AECM
Plug-and-play control box
1
11-2-1
SK04-ST-KM(H)-EC-004
EC MINI PCB STMB-EC-SP
1
11-2-2
SK06-KMH-002
Control box base FP-KM4(6)-H-601
1
11-2-3
SK06-KMH-003
Control box cover FP-KM4(6)-H-602
1
11-2-4
SK06-KMH-004
Terminal cover FP-KM4(6)-H-603
1
11-2-5
SK06-KMH-005
Wires protection hole FP-KM4(6)-H-603/1
1
11-2-6
SK08-TB-010
Terminal block JX0-B9-1
1
11-2-7
SK10-EC-XS-ST-KMH-002
Wires STMB-EC-KM4(6)H
1
Item
Code
Description
QTY
11-3
SKUSA-NCGH-003-AECM
Plug-and-play control box
1
11-3-1
SK04-ST-KM(H)-EC-004
EC MINI PCB STMB-EC-SP
1
11-3-2
SK06-KMH-002
Control box base FP-KM4(6)-H-601
1
11-3-3
SK06-KMH-003
Control box cover FP-KM4(6)-H-602
1
11-3-4
SK06-KMH-004
Terminal cover FP-KM4(6)-H-603
1
11-3-5
SK06-KMH-005
Wires protection hole FP-KM4(6)-H-603/1
1
11-3-6
SK08-TB-010
Terminal block JX0-B9-1
1
11-3-7
SK08-DQPJ-004
Relay 30A JQF-105F-4
1
11-3-8
SK10-EC-XS-ST-KMH-007
Wires STMB-EC-KM4(6)H
1
I.2.1. Spare Parts Of Twin Fan Model
I.3. Optional Parts
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
Page 97 of 98
12-Accessories
Item
Code
Description
QTY
12-1
SK-DFPS-A-002.1
Infra-red handset and wall-holder
1
12-2
SK-DFPS-A-002.2
Wired wall-pad controller
1
12-3
SKUSA-DFPS-A-003d
1 pc 2-way valve with 3/4" inch connectors and ON/
OFF thermoelectric actuator (24V)
1
12-4
SKUSA-DFPS-A-003c
1 pc 3-way bypass valve with 3/4" inch connectors
and ON/ OFF thermoelectric actuator (24V)
1
12-5
SK-NCGH-009a
ABS flange for branch duct connection
1
12-6
SK-NCGH-009b
ABS flange for fresh air duct connection
1
12-7
SK-NCGH-006-03-04
1 kW 220V(3,400 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCG-04
1
12-7
SK-NCGH-006-06-08
2 kW 220V (6,800 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCG-08
1
12-7
SK-NCGH-006-G09
3 kW 220V (10,200 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCG-09
1
12-7
SK-NCGH-006-G12-16
3 kW 220V (10,200 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCG-12/16
1
12-7
SK-NCGH-006-H09-12
3 kW 220V (10,200 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCH-12
1
12-7
SK-NCGH-006-H16-20
4 kW 220V (13,700 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCH-20
1
12-7
SKUSA-NCGH-006-03-04
0.5 kW 110V (1,700 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCG-04
1
12-7
SKUSA-NCGH-006-06-08
1 kW 110V (3,400 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCG-08
1
12-7
SKUSA-NCGH-006-G09
1.5 kW 110V (5,100 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCG-09
1
12-7
SKUSA-NCGH-006-G12-16
1.5 kW 110V (5,100 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCG-12/16
1
12-7
SKUSA-NCGH-006-H09-12
1.5 kW 110V (5,100 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCH-12
1
12-7
SKUSA-NCGH-006-H16-20
2 kW 110V (6,800 BTU/H) PTC electric heater with
2-stage safety cut-out which is used for PCH-20
1
I.4. Accessories
SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
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SK2014 SON-002-TechMnl PCG(H)-V/P-EC-001(Americas)
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