Daitsu FSTD SLIM - EC FLEX Series Manual

FSTD SLIM-01
FSTD SLIM-02
FSTD SLIM-03
FSTD SLIM-04
FSTD SLIM-05
FLOOR CEILING SLIM
FSTD SLIM - EC FLEX
Serie
FSTD SLIM - EC FLEX
Edition
R00
Models
INSTALLATION AND MAINTENANCE MANUAL
FSTD SLIM-01-4T
FSTD SLIM-02-4T
FSTD SLIM-03-4T
FSTD SLIM-04-4T
FSTD SLIM-05-4T

Page 1 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
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, we produce over
50,000 fan coil 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 CE
certification and ISO 9001, several products ranges
have UL / ETL safety approval in the USA and Canada,
Eurovent performance and sound certification as
well as ROHS compliance for Europe, giving you the
confidence of knowing our company is the right
choice when selecting fan coil units.
ALWAYS MAKE SURE THIS MANUAL REMAINS WITH THE UNIT. READ THIS MANUAL BEFORE PERFORMING ANY
OPERATION ON THE UNIT.

Page 2 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
Table of Contents
A. Technical Data...................................................................................................................................................................... 5
General Description........................................................................................................................................................ 5
General Specification ..................................................................................................................................................... 6
2-Pipe Systems........................................................................................................................................................ 6
4-Pipe Systems........................................................................................................................................................ 7
Coil Data ........................................................................................................................................................................ 8
2-Pipe Systems........................................................................................................................................................ 8
4-Pipe Systems........................................................................................................................................................ 8
Sound Power Data.......................................................................................................................................................... 9
Dimensions .................................................................................................................................................................. 14
Valve Information (Optional)........................................................................................................................................ 15
B. Installation ......................................................................................................................................................................... 18
Safety Precautions........................................................................................................................................................ 18
Installation and Location.............................................................................................................................................. 19
Front Panel Removal .................................................................................................................................................... 20
Electrical Connection.................................................................................................................................................... 20
Piping Connections....................................................................................................................................................... 22
Valve and External Drain Pan Installation ..................................................................................................................... 23
C. Maintenance ......................................................................................................................................................................25
General Maintenance................................................................................................................................................... 25
Regular Maintenance ................................................................................................................................................... 25
Filter Installation & Cleaning ........................................................................................................................................ 25
Fan Motor Assembly Maintenance ............................................................................................................................... 26
Water Fittings Interchange........................................................................................................................................... 26
D. Control Specifications: Complete Function PCB – TOTAL Type Control ..............................................................................27
I/O Port Definitions ...................................................................................................................................................... 27
Wiring Diagrams.......................................................................................................................................................... 28
Standard EC-TOTAL Type Control PCB .................................................................................................................... 28
Master-Slave Networking Wiring Diagram............................................................................................................. 29
Configuration Settings.................................................................................................................................................. 30
Control Logics for 2-Pipe System................................................................................................................................... 32
With Valve Configuration.......................................................................................................................................32
Without Valve Configuration ................................................................................................................................. 35
Control Logics For 4-Pipe System .................................................................................................................................. 37
Sleep Mode.................................................................................................................................................................. 39
Auto Fan Speed............................................................................................................................................................ 39
Modulating Valve Control Under Energy Saving Mode ................................................................................................. 39
Buzzer.......................................................................................................................................................................... 39
Auto Restart............................................................................................................................................................... 39
On/Off Switch On The Front Panel.............................................................................................................................. 40
Electric Heater Safety Switch ...................................................................................................................................... 40

Page 3 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
Low Temperature Protection of Indoor Coil in Winter ................................................................................................. 40
E. Networking System ............................................................................................................................................................41
Master-Slave Network .................................................................................................................................................. 41
Master Unit Control Settings.................................................................................................................................. 41
Master-Slave Network Setup ................................................................................................................................. 42
Master-Slave Communication Method................................................................................................................... 44
Open Modbus protocol................................................................................................................................................. 45
F. Control Specifications: Flexible Function PCB – FLEXI Type Control.................................................................................... 48
Features........................................................................................................................................................................ 48
I/O Port Definitions ....................................................................................................................................................... 48
Onboard Configuration ................................................................................................................................................. 48
Wiring Diagrams........................................................................................................................................................... 49
Standard EC-FLEXI Type Control PCB....................................................................................................................... 49
Control Logics Specification........................................................................................................................................... 50
Unit Power On/Off .................................................................................................................................................50
Alarm Protection and Error Display ........................................................................................................................50
Drain Pump Operation ........................................................................................................................................... 50
Modulating Signal Input ......................................................................................................................................... 50
Electrical Heater Operation .................................................................................................................................... 50
Low Temperature Protection of Indoor Coil in Winter ............................................................................................50
G. User Interface ....................................................................................................................................................................51
Remote Handset for TOTAL Type Control ...................................................................................................................... 51
Wired Wall Pad Controller............................................................................................................................................ 52
Thermostat for EC-FLEXI Type Control .......................................................................................................................... 56
LED display............................................................................................................................................................56
Parameters setting ................................................................................................................................................ 57
AC/EC fan coil thermostat ............................................................................................................................................ 58
I/O table................................................................................................................................................................ 59
Thermostat control specification...........................................................................................................................60
2-pipe thermostat control specification (Parameter 17=0) .................................................................................... 60
4-pipe thermostat control specification (Parameter 17=1) .................................................................................... 62
2-pipe +floor heating control specification (Parameter 17=2)................................................................................ 64
MODBUS Communication Protocols for Thermostat ............................................................................................. 65
H. Sensor Resistance R-T Conversion Table ............................................................................................................................67
I. Troubleshooting ..................................................................................................................................................................69
J. Accessories Descriptions.....................................................................................................................................................70
Electrical Heater............................................................................................................................................................ 70
Auxiliary External Drain Pan .......................................................................................................................................... 71
Supporting Feet............................................................................................................................................................. 71

Page 4 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
Model Code Nomenclature
FSTD SLIM
-
01
-
4T
FLEX-
EC
EC
EC Motor Configuration
FLEX
Flexible function onboard PCB with zone
control functionality.
4T
Chilled/Hot Water, 4-Pipe
01 - 05
Unit Sizes. See General Specification
section A for cooling and heating
capacities
FSTD SLIM
Super Slim Universal Unit

Page 5 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
Technical Data
General Description
The product represents all-in-one solution for cooling, heating and dehumidification. It achieves high energy saving levels as it
can be combined with low-temperature heat generators such as heat pump, condensing boilers and solar collectors. With its
sophisticated temperature regulator, it guarantees thermal comfort in every season. It heats and cools extremely quickly and
once the desired temperature is reached it maintains it accurately and silently.
STRUCTURE
The bearing structure is made of galvanized sheet-steel with holes for attaching the structure to the wall/ceiling. The “V” type
drain pan is used in the unit which ensure the unit can be installed vertically and horizontally. Fire resistant insulation is fitted
internally to provide both thermal and acoustic insulation.
FASCIA
The RAL9010 fascia is made of steel-sheet with electrostatic coating which is resistant to rust, corrosion, chemical agents,
solvents, aliphatic compounds and alcohols.
AIR DELIVERY GRILLE
The air delivery grill is made from ABS, which color is RAL9010.
HEAT EXCHANGER
The heat exchanger is a highly efficient coil in which copper pipes and aluminum fins are fixed by mechanical expansion. Coil
connections are provided with an anti-torsion system, hand air vent and water purge valves.
Coils are tested at the pressure of 25 bar and recommended for operating at 8 bar.
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.
AIR FILTER
The air filter is made of ABS with Nylon filter. It is easy to removing and cleaning, which can be cleaned by rinsing with water
or by gently vacuuming it.
Microprocessor controls (EC-TOTAL type)
The PCB (printed circuit board) Modbus microprocessor controls functionality of the indoor fan motor, water valves (ON/OFF)
and electric heater (optional), to maintain room conditions at a user-defined set point. Temperature settings, fan speeds and
other control functions can be changed by either infrared handset or wired wall pad controller.
Electro-mechanical controls (EC-FLEXI type)
A 230VAC signal from the thermostat which working power is from L and N or from indoor room to terminal H/M/L supplies
power to limited PCB. When any of H/M/L is powered ON, the stepping motor is working and open the louver at maximum
position. When all of H/M/L is powered OFF, the stepping motor will close the louver. The condensate pump will run
continuously, as long as coil temperature is less than 15°C. Alarm notification and zone control function are available. 40VA
24vac transformer is equipped with unit optionally, which is used to supply 24Vac power to thermostat and modulating valve.
EC-TOTAL-version unit
EC-FLEXI-version unit
Thermostat-(optional)

Page 6 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
General Specification
2-Pipe Systems
Product range:FSTD SLIM-EC Super Slim Universal Fan Coil with EC Motor
FSTD SLIM~-EC Super Slim Universal Unit 2-pipe with EC Motor
FSTD SLIM-[Size]-EC
01
02
03
04
05
Unit Configuration
Configuration
2-pipe
Number Of Fan Blowers
1
2
Power Supply
(V/Ph/Hz)
230/1/50
220/1/60
Operation Control
~TOTAL: Complete function onboard PCB with integrated group control
functionality.
~FLEXI: Flexible function onboard PCB with zone control functionality.
Performance Data
Air
Air Flow
H
m3/hr
184
300
420
524
590
M
146
230
333
412
450
L
92
142
228
337
392
Cooling
Cooling
Capacity
H
kW
0.96
1.64
2.36
2.93
3.4
M
0.8
1.34
1.99
2.44
2.78
L
0.56
0.92
1.48
2.1
2.5
Sensible
Cooling
Capacity
H
0.7
1.17
1.66
2.07
2.39
M
0.57
0.94
1.38
1.71
1.92
L
0.39
0.63
1.01
1.46
1.73
FCEER
Rating
73.7
94.0
118.1
163.2
180.9
Class
D
C
C
B
B
Heating
Heating
Capacity
H
kW
1
1.66
2.34
2.93
3.36
M
0.84
1.36
1.98
2.45
2.75
L
0.58
0.94
1.47
2.1
2.47
Max. Electric Heater
Capacity
0.75
1.0
1.5
2.0
FCCOP
Rating
76.0
95.3
116.5
164.9
180.8
Class
D
D
C
B
B
Noise
Sound Pressure Level
dB(A)
39/33/28
43/37/3
1
45/41/34
47/41/35
49/45/38
Sound Power Level
48/42/37
52/46/4
0
54/50/43
56/50/44
58/54/47
Electrical
Fan Motor
Power
H
W
13
18.7
20.3
23
24
M
10
13.6
15.8
16
16.7
L
8
10
13
12
12.8
Fan Motor Running
Current @ H
A
0.13
0.162
0.176
0.2
0.21
Hydraulic
Cooling
Water Flow
Rate
H
L/h
164
281
405
501
582
M
137
229
341
418
475
L
96
157
254
360
428
Cooling
Pressure
Drop
H
kPa
2.9
9.6
22.2
12.6
18.9
M
2.2
6.8
16.6
9.3
13.4
L
1.18
3.6
10
7.2
11.25
Heating
Water Flow
Rate
L/h
170.9
284.6
401.6
501.9
576
144.3
233.2
339.2
419.7
472
100.1
161.2
252.8
359.9
423.2
Heating
Pressure
Drop
H
kPa
2.6
8.1
18.2
10.5
15.5
M
1.9
5.8
13.6
7.7
11.
L
1
3.1
8.3
5.9
9.2
Water Content
L
0.44
0.73
1.03
1.32
1.61
Construction and Packing
Data
Water
Type
Socket (Threaded Female)
In
mm[in]
19.05 [3/4]
Out
Condensate Drainage
Connection
16 [5/8]
Dimensions
L
mm
740
940
1140
1340
1540
W
130
130
130
130
130
H
580
580
580
580
580
Net Weight
kg
19
22
25
28
31
a. Cooling mode (2-pipe):
b. Heating mode (2-pipe):
- Return air temperature: 27C DB/ 19C WB.
- Return air temperature: 20C.
- Inlet/ outlet water temperature: 7C/ 12C.
- Inlet/ outlet water temperature: 45C/ 40C.

Page 7 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
4-Pipe Systems
Product range:FSTD SLIM-4T~-ECM Super Slim Universal Unit 4-pipe with EC Motor
FSTD SLIM-4T~-ECM Super Slim Universal Unit 4-pipe with EC Motor
FSTD SLIM-[Size]-4T-EC
01
02
03
04
05
Unit Configuration
Configuration
4-pipe
Number Of Fan Blowers
1
2
Power Supply
(V/Ph/Hz)
230/1/50
220/1/60
Operation Control
~TOTAL: Complete function onboard PCB with integrated group control
functionality.
~FLEXI: Flexible function onboard PCB with zone control functionality.
Performance Data
Air
Air Flow
H
m3/hr
184
300
420
524
590
M
146
230
333
412
450
L
92
142
228
337
392
Cooling
Cooling Capacity
H
kW
0.95
1.6
2.27
2.85
3.3
M
0.8
1.31
1.92
2.37
2.7
L
0.56
0.89
1.43
2.04
2.43
Sensible Cooling
Capacity
H
0.68
1.12
1.6
2
2.31
M
0.56
0.9
1.33
1.65
1.87
L
0.38
0.61
0.97
1.41
1.68
FCEER
Rating
73.6
91.3
114.0
158.5
175.8
Class
D
C
C
B
B
Heating
Heating Capacity
H
kW
1.08
1.76
2.49
3.09
3.59
M
0.89
1.44
2.08
2.58
2.91
L
0.62
0.99
1.55
2.2
2.6
FCCOP
Rating
81.0
100.6
122.8
173.1
190.8
Class
D
C
C
B
B
Noise
Sound Pressure Level
dB(A)
39/33/28
43/37/31
45/41/34
47/41/35
49/45/38
Sound Power Level
48/42/37
52/46/40
54/50/43
56/50/44
58/54/47
Electrical
Fan Motor Power
H
W
13
18.7
20.3
23
24
M
10
13.6
15.8
16
16.7
L
8
10
13
12
12.8
Fan Motor Running Current @ H
A
0.13
0.162
0.176
0.2
0.21
Hydraulic
Cooling Water Flow
Rate
H
L/h
164
274
390
488
566
M
137
224
329
407
463
L
96
153
244
350
417
Cooling Pressure Drop
H
kPa
9.2
29.8
23
18.4
27.9
M
6.8
21.1
17.1
13.6
19.8
L
3.7
11.1
10.3
10.5
16.6
Hot Water Flow Rate
H
L/h
92
151
214
265
308
M
77
123
179
221
249
L
53
85
133
189
223
Heating Pressure Drop
H
kPa
8.8
28.8
67.6
17.3
26.5
M
6.4
20.3
49.9
12.7
18.5
L
3.5
10.9
30.3
9.7
15.4
Water Content – Chill Water
L
0.23
0.38
0.53
0.68
0.83
Water Content – Hot Water
0.115
0.19
0.265
0.34
0.415
Construction and
Packing Data
Water Type
Socket (Threaded Female)
Chilled Water
In
mm[in]
12.7 [1/2]
Out
Hot Water
In
Out
Condensate Drainage Connection
16 [5/8]
Dimensions
L
mm
740
940
1140
1340
1540
W
130
130
130
130
130
H
580
580
580
580
580
Net Weight
kg
19
22
25
28
31
a. Cooling mode (4-pipe)
b. Heating mode (4-pipe):
- Return air temperature: 27C DB/ 19C WB.
- Return air temperature: 20C.
- Inlet/ outlet water temperature: 7C/ 12C.
- Inlet/ outlet water temperature: 65C/ 55C.

Page 8 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
Coil Data
2-Pipe Systems
Model
Fin
height
(mm)
Fin
Length
(mm)
Fins per
Inch
No. of
Rows
Fin width
(mm)
No. of
Circuits
Tube Ø
(mm)
FSTD SLIM-01
300
301
12.7
2
44
2
9.52
FSTD SLIM-02
501
2
FSTD SLIM-03
701
2
FSTD SLIM-04
901
3
FSTD SLIM-05
1101
3
4-Pipe Systems
Cooling Coil
Model
Fin
height
(mm)
Fin
Length
(mm)
Fins per
Inch
No. of
Rows
Fin width
(mm)
No. of
Circuits
Tube Ø
(mm)
FSTD SLIM-01-4T
294
301
16.5
2
25.4
2
7
FSTD SLIM-02-4T
501
2
FSTD SLIM-03-4T
701
3
FSTD SLIM-04-4T
901
4
FSTD SLIM-05-4T
1101
4
Heating Coil
Model
Fin
height
(mm)
Fin Length
(mm)
Fins per
Inch
No. of
Rows
Fin width
(mm)
No. of
Circuits
Tube Ø
(mm)
FSTD SLIM-01-4T
294
301
16.5
1
12.7
1
7
FSTD SLIM-02-4T
501
1
FSTD SLIM-03-4T
701
1
FSTD SLIM-04-4T
901
2
FSTD SLIM-05-4T
1101
2

Page 9 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
Sound Power Data
Model
FSTD SLIM-01
Speed
H(1200
RPM)
M(1000
RPM)
L(800
RPM)
500RPM
600RPM
700RPM
800RPM
900RPM
1000RPM
1100RPM
1200RPM
1300RPM
1400RPM
Sound Power dB(A)
50.2
44.2
38.1
27.4
30.2
33.8
38.1
41.2
44.2
47
50.2
52
54.5
Sound Power in 1/3 Octave-bands under ESP:0P (dB)
20 Hz
13.8
15.7
8.8
12
10.1
11.4
8.8
12.2
15.7
9.2
13.8
14.4
15.6
25 Hz
13.6
12
13.6
12.7
10.5
7
13.6
12.5
12
7.3
13.6
13.2
12.7
31.5 Hz
7.4
10.7
10.8
8.1
6.4
3.1
10.8
5.7
10.7
6.5
7.4
7
5.5
40 Hz
3.8
9.2
14.5
4.6
3.5
3.2
14.5
2.6
9.2
9
3.8
3.5
13.6
50 Hz
8.2
6
10.1
6.9
5.4
7.1
10.1
10.4
6
9.8
8.2
13.2
14.6
63 Hz
9.2
5.6
3.3
5.2
3.4
3.3
3.3
5.2
5.6
8
9.2
12
10.9
80 Hz
11.7
4.5
0.5
-4.1
0.4
0.1
0.5
9
4.5
8.2
11.7
14.1
15.4
100 Hz
14.2
11.6
3.1
1.7
4.1
5.4
3.1
9.8
11.6
14.3
14.2
17.8
21
125 Hz
20.2
16.1
12.1
3.7
10.2
14.5
12.1
15.2
16.1
18.6
20.2
23
26
160 Hz
24.2
21.6
19.2
7.8
10.3
13.9
19.2
19
21.6
22.4
24.2
26.2
26.6
200 Hz
27
24.6
18.2
10.5
13
14.1
18.2
21.2
24.6
26.2
27
27.7
29.8
250 Hz
36.3
32.2
26.3
17.8
22.1
24.5
26.3
30.2
32.2
34
36.3
41
40.5
315 Hz
31
26.8
20.3
15.8
17.7
19.7
20.3
26.5
26.8
28.9
31
33.2
36.9
400 Hz
36.8
31.1
27
15.7
20
25.5
27
29.8
31.1
35.4
36.8
39.7
39.5
500 Hz
39.7
35.9
33.7
16.1
21.7
25.3
33.7
34
35.9
38
39.7
40.8
42.8
630 Hz
42.4
36.6
29.3
13.2
19.7
24.8
29.3
32.4
36.6
39.3
42.4
42.2
45.2
800 Hz
40.9
35.7
29.2
12
18.1
22.7
29.2
33.2
35.7
38.6
40.9
42.9
48.1
1000 Hz
42.3
36.2
26.7
12.6
18.6
23.7
26.7
33.6
36.2
39.7
42.3
45.2
48.8
1250 Hz
40.2
33.5
24.4
12.2
16
20.8
24.4
29.8
33.5
37.6
40.2
42.7
45.4
1600 Hz
37.4
30.5
22.1
13.6
14.8
17.7
22.1
27.4
30.5
34.4
37.4
40
42.8
2000 Hz
34.2
26.7
19.3
13.2
13.6
15.8
19.3
23.8
26.7
31.2
34.2
37.3
39.4
2500 Hz
32.5
25.1
18.9
14.3
14.7
17.9
18.9
21.9
25.1
29.4
32.5
35.5
38.2
3150 Hz
32.1
23.3
15.8
13.8
14
14.1
15.8
19.9
23.3
28
32.1
35.4
38.3
4000 Hz
27.2
18.8
14.5
13.8
14.1
14.1
14.5
16.3
18.8
23.5
27.2
30.6
34.1
5000 Hz
24.5
16.5
14.3
13.8
14
13.8
14.3
15
16.5
20.7
24.5
28.6
31.8
6300 Hz
19.4
14.8
13.7
13.5
13.4
13.6
13.7
13.8
14.8
16.8
19.4
23.1
26.7
8000 Hz
16
13.2
13
12.8
12.9
13
13
12.9
13.2
14.1
16
19.4
22.7
10000 Hz
13.3
12
11.8
11.2
11.4
11.6
11.8
11.6
12
12.2
13.3
15.2
17.7
12500 Hz
7.8
7.9
7.6
7.5
7.6
8.5
7.6
7.7
7.9
7.7
7.8
8.6
9.9
16000 Hz
11.7
11.2
9.9
7.6
8.7
11.3
9.9
10.6
11.2
11.7
11.7
12
12.5