Mestek HWL2-1116 Instruction manual

HWL2-1116
IN UNITED STATES: 260 NORTH ELM ST. WESTFIELD, MA 01085 800-465-8558 / FAX [phone]
IN CANADA: 7555 TRANMERE DRIVE, MISSISSAUGA, ONTARIO, L5S 1L4 [phone] / FAX [phone]
MODEL HW
INSTALLATION,
OPERATION &
MAINTENANCE
MANUAL
Low Temperature
High Wall Heating/Cooling Fan Coil
Units up to 2 Ton Capacity

Page 1 of 57
SK2016 HW-V-AECM-001
INVESTING IN QUALITY, RELIABILITY & PERFORMANCE.
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 air-conditioning test rooms
and manufacturing technology, our factories in China
produce over 2,000,000 air conditioning units each
year, all conforming to the highest international
standards of quality and safety.
ETL SAFETY STANDARDS
The Highest Standards of Manufacturing
All products conform to UL standard for
Safety for Heating and Cooling
Equipment UL1995 4th Edition, October
14, 2011;
All products conform to CSA standard for
Safety for Heating and Cooling
Equipment CSA C22.2 No.236-11, 4th
Edition, October 14 2011.
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 ranges
have UL / ETL safety approval in the USA and Canada,
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 UNIT. READ THIS MANUAL BEFORE PERFORMING ANY OPERATION
ON THE UNIT.

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SK2016 HW-V-AECM-001
Table of Content
E
A. GENERAL DESCRIPTION .................................................................................................................................................4
B. TECHNICAL DATA ..........................................................................................................................................................5
B.1. GENERAL SPECIFICATION....................................................................................................................................................5
B.1.1. HW–AECM Series Specifications .............................................................................................................................5
B.2. COIL DATA ......................................................................................................................................................................6
B.2.1. 2-Pipe Systems........................................................................................................................................................6
B.5. VALVE INFORMATION......................................................................................................................................................11
B.5.2. 3-Way 1/2” Valve Body.........................................................................................................................................11
C. SERVICE AND INSTALLATION.......................................................................................................................................12
C.1. INSTALLATION OF HIGH-WALL UNIT...................................................................................................................................12
C.1.1. Selecting a Location..............................................................................................................................................12
C.1.2. Mounting Plate Dimensions..................................................................................................................................13
C.1.3. Installing the Mounting Plate ...............................................................................................................................14
C.1.4. Drilling the Condensate Drainage Hole.................................................................................................................14
C.1.5. Installing the Hydronic Unit ..................................................................................................................................15
C.1.6. Drainage Piping Works .........................................................................................................................................15
C.2. UNIT MAINTENANCE AND PREPARATION.............................................................................................................................16
C.2.1. Opening and Closing Of Lift-Up Grille Cover .........................................................................................................16
C.2.2. Removing Front Cover Assembly ..........................................................................................................................16
C.2.3. Air Purging ............................................................................................................................................................17
C.2.4. Wiring Connections...............................................................................................................................................17
C.3. PIPE CONNECTIONS WITH VALVE .......................................................................................................................................18
D. CONTROL SPECIFICATIONS: COMPLETE CONTROL PCB - S TYPE CONTROL...................................................................19
D.1. DEFINITION OF INPUT/OUTPUT.........................................................................................................................................19
D.2. WIRING DIAGRAM FULL CONTROL PCB –SCONTROL TYPE ...................................................................................................20
D.3. CONFIGURATION SETTINGS...............................................................................................................................................21
D.4. CONTROL LOGICS FOR 2-PIPE SYSTEM................................................................................................................................23
D.4.1. With Thermoelectric Valve Configuration ............................................................................................................23
D.4.2. Without Thermoelectric Valve Configuration .......................................................................................................26
D.5. CONTROL LOGICS FOR 4-PIPE SYSTEM................................................................................................................................28
D.6. SLEEP MODE ..............................................................................................................................................................30
D.7. AUTO FAN SPEED ...........................................................................................................................................................30
D.8. LOUVER........................................................................................................................................................................31
D.9. BUZZER ........................................................................................................................................................................31
D.10. AUTO RESTART ..............................................................................................................................................................31
D.11. OPERATION OF CONTROL PANEL ON HIGH-WALL UNIT ........................................................................................................31
D.11.1. On/Off Switch ..................................................................................................................................................31
D.11.2. Electric Heater Safety Switch (on control PCB) ................................................................................................31
D.13. LED DISPLAY AND ERROR DESCRIPTION..............................................................................................................................33
D.14. LED DISPLAY ON MASTER/SLAVE CONNECTION....................................................................................................................34
E. NETWORKING SYSTEM................................................................................................................................................35
E.1. MASTER –SLAVE NETWORK.............................................................................................................................................35
E.1.1. Master –Slave Network Setup .............................................................................................................................36
E.1.2. Master-Slave Communication Method.................................................................................................................39
E.2. UNIT NETWORK WIRING SCHEME .....................................................................................................................................40
E.3. OPEN MODBUS PROTOCOL ..............................................................................................................................................41
F. CONTROL SPECIFICATIONS: FLEXIBLE CONTROL PCB - W TYPE CONTROL ....................................................................45
F.1. DEFINITION OF INPUT/OUTPUT.........................................................................................................................................45
F.2. WIRING DIAGRAM FLEXIBLE CONTROL PCB -WCONTROL TYPE..............................................................................................46
F.3. ONBOARD CONFIGURATION..............................................................................................................................................47
F.4. CONTROL LOGICS ...........................................................................................................................................................48
F.5. LED DISPLAY.................................................................................................................................................................48
F.6. ERROR DESCRIPTION.......................................................................................................................................................48

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SK2016 HW-V-AECM-001
G. USERS INTERFACE .......................................................................................................................................................49
G.1. REMOTE CONTROL HANDSET............................................................................................................................................49
G.2. WIRED WALL PAD..........................................................................................................................................................50
G.2.1. Wall Pad Display ..............................................................................................................................................50
G.2.2. Wall Pad Operation Guidelines ........................................................................................................................51
G.2.3. EC unit RPM setting .........................................................................................................................................54
H. SENSOR RESISTANCE R-T CONVERSION TABLE ............................................................................................................55
I. TROUBLESHOOTING GUIDE.........................................................................................................................................57

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SK2016 HW-V-AECM-001
A. General Description
This High- Wall Unit is designed to meet and exceed demanding requirements for efficiency, quiet
operation and appearance. The sleek profile and elegantly styled cabinet complements any interior
design theme, while the microprocessor assures accurate environmental control.
Cabinet ~ the stylish cabinet is constructed of durable flame resistant acrylonitrile-butadiene-styrene
(ABS) plastic. The silver white color and rounded corners provide its modern look.
Water Coil ~ the water coil has a large heat transfer surface and utilizes the latest fin profile
technology. It combines an advanced technology approach with the security of a traditional design
regarding tube thickness. The water coil is also equipped with an air vent valve and a water purge
valve.
Integral Hoses ~ an integral hose is a synthetic elastomer tube, with stainless steel outer braiding
and brass connectors, which enables quick, low cost connections with no brazing.
Blower and Motor ~ the unit incorporates only specially designed and tested EC motors, allowing the
blower wheel to provide optimum performance in airflow-efficiency and quiet operation.
Filters ~ washable, easy-to-remove, fine mesh air filters are standard to all high-wall models. Tabs
located on the front of the unit can be unsnapped, allowing the filter to be easily slid downward and
removed. No tools are required, nor any dismantling of the equipment.
Air Grille Distribution ~ all units are equipped with both deflector blades and independent
directional vanes, enabling supply air to be automatically distributed, and air flow and direction to be
customized.
Microprocessor Control ~ see Controls Specifications for complete control specifications and
details. The main design features include:
~ FCEER rating class: A/B.
~ FCCOP rating class: B/C.
~ High efficiency EC motor with PID algorithmic processing in auto-mode.
~ 2-pipe, 2-pipe with booster electric heat, 2-pipe with primary electric heat, 4-pipe with 4x2 device
installed.
~ Cool, Heat, Auto, Dehumidifier and Fan modes.
~ Sleep, Auto-Fan, Daily Timer, Auto-Restart with memory functions.
~ User friendly remote control handset.
~ Heat and cool temperature protections and safety cut out.
~ 2-way and 3-way on/off valve control.
~ Addressable control and error diagnostics (Master-Slave) for sub-networks of up to 32 units, with IR
handset as global control interface.
~ Wired wall pad controller (optional) with 7-day programmable timer, real-time clock, network control
(global and addressable) and error diagnostics.
~ Manual control panel in cabinet.
~ Auxiliary switch for cooling and heating signal.
~ Occupancy (remote on/off) contacts / economy mode contacts.
~ Open Modbus communication protocol.
~ Local PC host control solution (optional).

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SK2016 HW-V-AECM-001
B. Technical Data
B.1. General Specification
B.1.1. HW–AECM Series Specifications
Product range:HW-AECM Hydronic High Wall 2 pipe with EC Motor (American Standard)
HW-[Size]-V~-AECM
04
06
12
15
18
20
24
30
Unit
Configuration
Configuration
2-pipe
Number Of Fan Blowers
Single
Power Supply
(V/Ph/Hz)
220 or 115/1/60
Operation Control
~S: Complete function onboard PCB with integrated group control functionality.
~W: Flexible function onboard PCB with drain pump, louver and zone control
functionality.
Performance Data
Air
Air Flow
H
CFM
218
294
294
379
464
576
635
729
M
171
218
218
294
435
447
576
635
L
129
171
171
218
335
353
353
447
Cooling
Cooling Capacity
H
BTU/Hr
4158
6967
8394
10207
12602
16293
18174
20249
M
3497
5534
6277
8394
11069
13254
16293
17493
L
2833
4620
5486
6339
9040
11393
11393
13254
Sensible Cooling Capacity
H
2936
4889
5822
7126
8808
11171
12499
13969
M
2458
3856
4313
5822
7702
9034
11171
12018
L
1979
3202
3754
4357
6247
7734
7734
9034
Heating
Heating Capacity
H
BTU/Hr
6653
11147
13430
16331
20163
26069
29078
32398
M
5595
8854
10043
13430
17710
21206
26069
27989
L
4533
7392
8778
10142
14464
18229
18229
21206
Max. Electric Heater Capacity@115V
1700
2500
Max. Electric Heater Capacity@220V
3400
5100
Electrical
Fan motor power
H
W
13
18
18
26
30
30
40
50
M
10
13
13
20
20
20
30
40
L
6
10
10
13
13
15
19
25
Fan Motor Running Current @ H 115V
A
0.16
0.284
0.284
0.364
0.544
0.696
1.04
1.5
Fan Motor Running Current @ H 220V
A
0.08
0.142
0.142
0.182
0.272
0.348
0.52
0.75
Soun
d
Sound PressureLevel
dB(A)
31/26/24
39/31/26
40/33/28
45/34/31
49/44/37
43/39/36
47/43/37
50/47/40
Sound Power Level
40/35/33
48/40/35
49/42/37
54/43/40
58/53/46
52/48/45
56/52/46
59/56/49
Hydraulic
Cooling Water Flow Rate
H
GPM
0.83
1.39
1.68
2.03
2.52
3.25
3.63
4.04
M
0.70
1.10
1.25
1.68
2.20
2.65
3.25
3.49
L
0.56
0.92
1.09
1.26
1.81
2.27
2.27
2.65
Cooling Pressure Drop
H
Ft.wg
6.18
7.53
6.37
8.92
6.12
11.92
14.33
17.33
M
4.61
5.09
3.88
6.37
4.91
8.33
11.92
13.42
L
3.23
3.75
3.09
3.95
3.48
6.47
6.47
8.33
Heating Water Flow Rate
GPM
Same as "Cooling Water Flow Rate"
@H/M/L
Heating Pressure Drop
H
Ft.wg
4.95
6.03
5.09
7.13
4.89
9.53
11.47
13.87
M
3.69
4.07
3.11
5.09
3.93
6.67
9.53
10.73
L
2.58
3.00
2.47
3.16
2.79
5.17
5.17
6.67
Water Content
gal
0.01
0.02
0.03
0.03
0.05
0.07
0.07
0.07
Construction and
Package Data
Water
Type
Socket (NPT Threaded Female)
Connections
In
in
1/2"
Out
Condensate Drainage Connection
0.63
Dimensions
L
in
34.45
41.34
W
8.66
9.25
H
11.81
12.2
Net Weight
lbs
24.3
26.5
28.7
28.7
30.9
35.3
35.3
35.3
a. Cooling mode (2-pipe): b. Heating mode (2-pipe):
- Return air temperature: 80.0F DB/ 67.0F WB. - Return air temperature: 70F.
- Inlet/ outlet water temperature: 45F/55F. - Inlet water temperature: 140F.
- Water flow-rate: same as cooling mode.

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SK2016 HW-V-AECM-001
B.2. Coil Data
B.2.1. 2-Pipe Systems
Model
Fin Height
(inch)
Fin Length
(inch)
Fins per Inch
No. of Rows
No. of Copper
No. of Circuits
Tube
Diameter
(inch)
HW‐04
9.1
26.8
19.5
2
8
2
0.3
HW‐06
14.1
26.8
2
20
4
0.3
HW‐12
14.1
26.8
2
26
5
0.3
HW‐15
14.1
26.8
2
26
5
0.3
HW‐18
14.1
26.8
2
34
5
0.3
HW‐20
14.9
33.3
2
36
6
0.3
HW‐24
14.9
33.3
2
36
6
0.3
HW‐30
14.9
33.3
2
36
6
0.3

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SK2016 HW-V-AECM-001
B.3. Sound Power and Pressure data
Sound Power
A-weighted
Sound Power dB(A)
31.0
29.2
27.8
43.1
33.9
29.9
43.1
33.9
29.9
50.1
37.1
33.6
Sound Power in 1/3 Octave-bands (unit dB)
31.5Hz
4.6
10.4
11.5
2.3
0.9
4.1
11.5
0.9
4.1
10.3
5.4
8.9
63Hz
3.1
3.5
4.9
0.8
5.5
3.4
10.0
5.5
3.4
13.0
3.8
2.3
125Hz
6.2
7.5
6.2
7.8
8.4
5.5
17.0
8.4
5.5
22.2
11.7
8.7
250Hz
17.5
13.5
10.1
21.1
22.5
17.8
30.3
22.5
17.8
38.3
25.3
23.7
500Hz
23.0
17.8
13.0
25.9
26.6
21.2
35.1
26.6
21.2
41.7
30.5
26.1
1000Hz
19.8
15.2
12.8
23.1
21.1
16.3
32.3
21.1
16.3
40.2
26.4
20.9
2000Hz
16.0
15.2
14.8
16.8
16.9
15.1
26.1
16.9
15.1
35.8
20.4
17.0
4000Hz
15.4
15.6
15.4
9.1
15.8
15.3
18.3
15.8
15.3
26.1
16.4
15.9
8000Hz
14.6
14.6
14.3
5.5
14.9
14.4
14.8
14.9
14.4
17.1
14.9
14.7
16000Hz
7.4
8.6
7.8
-1.2
7.8
7.9
8.0
7.8
7.9
7.9
7.9
8.0
Speed
H
M
L
H
M
L
H
M
L
H
M
L
Model
HW-04
HW-06
HW-12
HW-15
A-weighted
Sound Power dB(A)
53.7
48.6
41.3
46.8
43.4
40.1
49.8
46.8
40.1
55.7
52.1
43.4
Sound Power in 1/3 Octave-bands (unit dB)
31.5Hz
3.6
3.9
11.5
16.8
8.3
12.3
12.8
16.8
12.3
17.1
9.4
8.3
63Hz
22.3
14.5
11.1
17.2
11.2
11.8
12.3
17.2
11.8
22.4
18.0
11.2
125Hz
27.2
20.4
15.0
21.2
18.5
14.9
23.0
21.2
14.9
26.0
25.2
18.5
250Hz
42.3
36.1
29.5
32.8
29.7
25.5
35.0
32.8
25.5
40.6
38.1
29.7
500Hz
45.8
40.3
35.1
38.4
36.5
33.0
41.5
38.4
33.0
47.0
44.6
36.5
1000Hz
43.9
38.5
31.4
36.2
32.9
29.3
39.9
36.2
29.3
46.3
42.1
32.9
2000Hz
40.7
33.8
24.4
29.4
25.4
26.7
33.7
29.4
26.7
40.9
36.6
25.4
4000Hz
31.7
24.5
17.9
21.3
18.8
32.2
24.6
21.3
32.2
33.8
28.3
18.8
8000Hz
20.4
16.1
15.0
15.5
15.8
33.0
16.9
15.5
33.0
21.2
18.6
15.8
16000Hz
8.2
10.7
7.8
6.9
6.9
27.1
10.9
6.9
27.1
8.2
7.0
6.9
Speed
H
M
L
H
M
L
H
M
L
H
M
L
Model
HW-18
HW-20
HW-24
HW-30

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SK2016 HW-V-AECM-001
Sound Pressure
A-weighted
Sound Pressure dB(A)
21.8
20
18.6
33.8
24.6
20.7
33.8
24.6
20.7
40.9
27.9
24.3
Sound Pressure in 1/3 Octave-bands (unit: dB)
31.5Hz
-4.7
1.2
2.2
11.5
-8.4
-5.1
2.3
-8.4
-5.1
1.1
-4.6
-3.8
63Hz
-6.1
-5.7
-4.3
10.0
-3.8
-5.9
0.8
-3.8
-5.9
3.8
-6.2
-5.4
125Hz
-3.0
-1.7
-3.1
17.0
-0.8
-3.8
7.8
-0.8
-3.8
12.9
1.7
2.5
250Hz
8.2
4.3
0.9
30.3
13.2
8.6
21.1
13.2
8.6
29.0
15.3
16.1
500Hz
13.8
8.6
3.8
35.1
17.3
11.9
25.9
17.3
11.9
32.4
20.5
21.3
1000Hz
10.6
5.9
3.5
32.3
11.9
7.1
23.1
11.9
7.1
31.0
16.4
17.2
2000Hz
6.8
6.0
5.6
26.1
7.7
5.9
16.8
7.7
5.9
26.6
10.3
11.1
4000Hz
6.2
6.4
6.2
18.3
6.6
6.1
9.1
6.6
6.1
16.9
6.3
7.1
8000Hz
5.4
5.4
5.1
14.8
5.7
5.1
5.5
5.7
5.1
7.8
4.9
5.7
16000Hz
-1.9
-0.6
-1.5
8.0
-1.4
-1.3
-1.2
-1.4
-1.3
-1.3
-2.2
-1.4
Speed
H
M
L
H
M
L
H
M
L
H
M
L
Model
HW-04
HW-06
HW-12
HW-15
A-weighted
Sound Pressure dB(A)
44.4
39.4
32
37.5
34.2
30.9
40.5
37.5
30.9
46.5
42.9
34.2
Sound Pressure in 1/3 Octave-bands (unit: dB)
31.5Hz
-5.7
-5.3
2.2
7.6
-0.9
3.1
3.6
7.6
3.1
7.9
0.1
-0.9
63Hz
13.1
5.3
1.9
7.9
2.0
2.5
3.1
7.9
2.5
13.2
8.8
2.0
125Hz
17.9
11.2
5.8
12.0
9.3
5.7
13.7
12.0
5.7
16.8
16.0
9.3
250Hz
33.1
26.9
20.3
23.6
20.5
16.3
25.8
23.6
16.3
31.3
28.8
20.5
500Hz
36.6
31.1
25.9
29.1
27.3
23.8
32.3
29.1
23.8
37.7
35.4
27.3
1000Hz
34.7
29.3
22.2
27.0
23.7
20.1
30.7
27.0
20.1
37.1
32.9
23.7
2000Hz
31.5
24.6
15.2
20.2
16.2
17.4
24.5
20.2
17.4
31.6
27.4
16.2
4000Hz
22.5
15.3
8.7
12.1
9.6
23.0
15.4
12.1
23.0
24.5
19.1
9.6
8000Hz
11.2
6.9
5.7
6.3
6.5
23.8
7.7
6.3
23.8
12.0
9.3
6.5
16000Hz
-1.1
1.5
-1.4
-2.3
-2.4
17.9
1.7
-2.3
17.9
-1.0
-2.2
-2.4
Speed
H
M
L
H
M
L
H
M
L
H
M
L
Model
HW-18
HW-20
HW-24
HW-30

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SK2016 HW-V-AECM-001
B.4. Dimensional Drawings
Dimensional drawing for HW-04/06/12/15/18-AECM
Model
Unit Dimensions
A
B
C
D
E
F
G
H
HW-04/06/12/15/18
1.57
4.13
34.45
2.17
4.13
R0.78
2.36
2.91
(All dimensions shown in inch)
Model
Unit Dimensions
a
b
c
d
e
f
g
h
HW-04/06/12/15/18
7.87
2.17
1.18
1.18
8.66
9.02
0.39
11.81
Model
Unit Dimensions
1
2
3
4
HW-04/06/12/15/18
26.18
6.69
27.95
4.92

Page 10 of 57
Page 10 of 57
SK2016 HW-V-AECM-001
Dimensional drawing for HW-20/24/30-AECM
Model
Unit Dimensions
A
B
C
D
E
F
G
HW-20/24/30
3.54
41.34
2.01
3.54
0.59
2.87
2.91
Model
Unit Dimensions
1
2
3
4
HW-20/24/30
33.66
6.10
32.28
6.89
(All dimensions shown in inch)
Model
Unit Dimensions
a
b
c
d
e
f
g
h
HW-20/24/30
8.46
2.05
1.18
1.26
9.25
12.20
2.28
0.51

Page 11 of 57
Page 11 of 57
SK2016 HW-V-AECM-001
B.5. Valve Information
B.5.1. 2-Way 1/2” Valve Body
B.5.2. 3-Way 1/2” Valve Body
Differential Pressure Chart
Valve Model
Valve Dimensions (inch)
DN
A
B
C
D
SGS14HFCA-23020201
D15
(G1/2”)
2.05
1.85
0.77
2.48
Valve Model
Valve Dimensions (inch)
DN
A
B
C
D
SGS14HFCA-23020202
D15
(G1/2”)
2.05
2.76
1.57
3.39

Page 12 of 57
Page 12 of 57
SK2016 HW-V-AECM-001
C. Service and Installation
Operating Limits
Power supplies
Volt
Phase
Hz
Model
208~240
1
60
HW-VX-AECM
110~120
1
60
HW-VY-AECM
Water circuit
Minimum entering water temperature
+2°C (35.6°F)
Maximum entering water temperature
+80°C (176°F)
Water side recommended maximum pressure
1600 kPa (232 PSI)
C.1. Installation of High-Wall Unit
C.1.1. Selecting a Location
Select the location for the high-wall unit with the following considerations in mind:
1. The front of the air inlet and outlet should be clear of any obstructions. The air should flow freely.
2. The wall where the unit is to be mounted should be solid enough not to resonate and produce noise.
3. The location should allow easy access to install the connecting water pipes, and be where drainage can be easily
achieved.
4. Ensure the clearance around the fan coil unit conforms to the following drawing.
5. From the floor the height of the unit should be above eye level.
6. Avoid installing the unit in direct sunlight.
* Required clearance for maintenance and servicing is as shown above.
** All dimensions shown in mm.
7. The signal receiver on the unit must be kept away from any high frequency emission source.
8. Keep the unit away from fluorescent lamps, which may affect the control system.
9. To avoid electromagnetic control system interference, ensure control wires are installed separately from 110-
240 VAC power supply wires.
10. Where electromagnetic waves are present, use shielded sensor cables.
11. Install a noise filter if the power supply creates any disruptive noises.
Higher than eye level

Page 13 of 57
Page 13 of 57
SK2016 HW-V-AECM-001
C.1.2. Mounting Plate Dimensions
HW-04/06/12/15/18 –AECM
HW-20/24/30 –AECM
(All dimensions shown in inch)

Page 14 of 57
Page 14 of 57
SK2016 HW-V-AECM-001
C.1.3. Installing the Mounting Plate
1. Select the structural position (e.g. a pillar or lintel) on the wall.
2. Then temporarily fasten the mounting plate on the wall with a steel nail.
3. Mount the mounting plate horizontally as shown in the above
figure or by means of gradiometer. Failure to follow this may
cause water to drip indoors and create atypical noise.
4. Fix the mounting plate by means of expansion screws or
tapping screws.
C.1.4. Drilling the Condensate Drainage Hole
1. Ensure that the hole for condensate drainage is correctly positioned. The height should be lower than the
bottom edge of the indoor unit.
2. Drill a 65mm diameter hole with a descending slope.
3. Seal it off with putty after installation.

Page 15 of 57
Page 15 of 57
SK2016 HW-V-AECM-001
C.1.5. Installing the Hydronic Unit
1. Pass the piping through the hole in the wall and hook the indoor unit on the mounting plate by the upper hooks.
2. Move the body of the unit from side to side to verify if it is securely fixed.
3. While pushing the unit toward the wall, lift it slightly from beneath to hook it up on the mounting plate by the
lower hooks.
4. Make sure the unit firmly rests on the hooks of the mounting plate.
C.1.6. Drainage Piping Works
1. Install the drain hose so that it slopes downward slightly for free drainage. Avoid installing it as shown in the
below illustrations marked with an “X”.
2. Put water in the drain pan and make sure that the water drains outdoors.
3. If the flexible drain hose provided with the indoor unit is not long enough, please extend it by joining it to an
extension hose (not provided). Be sure to insulate the connecting part of the extension drain hose with a shield
pipe as shown.
4. If the attached drain hose passes through an indoor area, insulate it with heat insulation material.

Page 16 of 57
Page 16 of 57
SK2016 HW-V-AECM-001
C.2. Unit Maintenance and Preparation
C.2.1. Opening and Closing Of Lift-Up Grille Cover
Open the grille cover by lifting from the bottom position
indicated by the arrows.
Close the grille cover by pressing down at
the positions indicated by the arrows.
C.2.2. Removing Front Cover Assembly
1. Set the horizontal louver to the horizontal position.
2. Remove the screw caps below the louver, and then remove the mounting screws.
3. Open the lift-up grille cover by grasping the panel at both sides as shown above.
4. Remove the remaining screws located in the center of the front cover.
5. Grasp the lower part of the front cover and pull the entire assembly out and up towards you.

Page 17 of 57
Page 17 of 57
SK2016 HW-V-AECM-001
C.2.3. Air Purging
1. After connecting the water inlet and outlet pipes to the main supply lines turn on the main breaker and operate
the unit in COOLING mode.
2. Open the water inlet valve and flood the coil.
3. Check all connections for water leakage. If no leak is found, open the purging valve with an open end wrench
while supporting the unit with your other hand. Then purge the air trapped inside the coil. When performing this
activity, take care not to touch the electrical parts.
4. Close the purging valve when no bubbles appear.
5. Open the water outlet valve.
C.2.4. Wiring Connections
Unit components are wired to the terminal block of the indoor unit. Wiring can be accessed from the terminal block
inside the control box.

Page 18 of 57
Page 18 of 57
SK2016 HW-V-AECM-001
C.3. Pipe Connections with Valve
Pre-assembly
Complete Assembly
Flexible hose
Valve body
with actuator
½” gasket
Coil connector

Page 19 of 57
Page 19 of 57
SK2016 HW-V-AECM-001
D. Control Specifications: Complete Control PCB - S Type Control
Used in all High-Wall [V/P] ~S unit configurations.
Abbreviations
Ts = Setting temperature
Tr = Room air temperature
Ti1 = Chilled water coil temperature
Ti2 = Hot water coil temperature
AUX1 = Hot water free contact
AUX2 = Chilled water free contact
MTV1 = Chilled Motorized valve
MTV2 = Hot Motorized valve
D.1. Definition of Input/Output
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-DIS1
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 contacts: for remote activation of economy
mode (when DIPB SW1 = 0).
Electrical heater safety switch
EH
Voltage-free (NC). The contact is closed before the EH is
turned on.
Power input
Phase
L1
Power supply: 220V/1Ph/60Hz
115V/1Ph/60Hz
Neutral
N1
Earth
PE1
Voltage output
Fan
CN4
Fan driver
Valve 1
MTV1
2-pipe coil circuit valve
output –chilled / hot water
valve.
Voltage output (L)
2-pipe coil circuit valve
output –chilled water
valve.
Voltage output (L)
Valve 2
MTV2
Reserved
4-pipe coil circuit valve
output –hot water valve.
Voltage output (L)
Voltage of electrical heater (Live)
HEAT
Voltage output (L), maximum 25 A
Output
Stepping motor
CN1 / CN2
Louver stepping motor relay
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 < 100ft
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 < 200” 100ft
Serial BUS port
CN3
Master-slave network serial connection OR
MODBUS / local PC host network serial connection.