Hope SSTB User manual

HA17051E
TYPE SSTB
SILENT BLOWER
INSTRUCTION MANUAL
YOKOI KIKAI KOSAKUSHO CO.,LTD.
2720-1 OHORAGUCHINAKASHIDAMI MORIYAMA-KU NAGOYA 463-0002 JAPAN
TEL [phone]
FAX [phone]

Table of Contents
1．Inspection confirmation at the time of purchase · Outline .................... 1
2．Precautions when using IE 3 (high efficiency motor) ........................ 1
3．Specification............................................................ 2
4．Safety precautions ...................................................... 3
5．Please be sure to read ................................................... 4
6．Transportation method · Precautions for installation · Piping ............... 5
7．Wiring connection of the Motor ......................................... 6
8．Star delta starting ...................................................... 7
9．Starting current and starting time ........................................ 8
10．About electromagnetic contactor, switch, thermal relay .................. 9,10
11．Operation · Maintenance inspection · Roll filter ............................................. 11,12
12．Disassembly, Precautions in assembling ................................ 13
13．Structure drawing .................................................. 13,14

- 1 -
Thank you very much for your purchase of SSTB type silent blower.
Please read this manual for the perfect capability to be assured and also for its m
aintenance and inspection.
Please be sure to deliver this instruction manual not only to the contractor but also to the
end user.
■Inspection confirmation at the time of purchase
Please check with the nameplate of the blower and the specification table below to see if
it is the product you ordered.
Especially depending on the area, there is a distinction of 50 · 60 Hz so please check.
Also please check for damage etc. during transportation.
■Outline
This is a “low noise type blower” realized by improving the air pressure characteristics
and suppressing noise of our long-reputed WTB Series.
Owing to the roll filter employed, the filter can be replaced easily with no need of cleaning
the filter.
■Precautions when using IE 3 (high efficiency motor)
Because IE 3 (high efficiency motor) suppresses generation loss, rotation speed
generally becomes faster than IE 1 (standard motor). When IE1 (standard motor) is
replaced with IE3 (high efficiency motor), the output of the motor increases as this
rotational speed increases. Motor efficiency is high, but as the output increases,
power consumption may increase.
Also, since the (primary and secondary) resistors are lowered to reduce copper losses,
the starting current is higher for IE1 (standard motor), and it is necessary to change
wiring breaker, electromagnetic switch, thermal relay, etc. It may become.

- 2 -
■Specification IE 3 (high efficiency motor)
【Standard type・・・SSTB-S】50Hz／60Hz
Type
Air
quantity
(m3/min)
Static
pressure
(kPa)
Motor
power
(kW)
Rated
current
(A)
Connection
Revolution
per minute
(min-1)
A Sound
level
(dB)
Weight
(kg)
3S 5／4 6.0／6.5 1.5 6.2／6.2 80A 2890／3460
62／63 225
4S 9／9 6.0／6.0 2.2 9.2／9.0 100A 2875／3445
65／66 246
5S 17／16 6.5／6.5 3.7 14.4／14.2 125A 2910／3490
67／68 319
6S 25／26 6.5／6.5 5.5 21.4／21.0 150A 2920／3500
69／71 348
8S 35／34 7.0／7.0 7.5 29.8／28.6 200A 2920／3505
71／73 448
10S
54／55 6.0／6.0 11.0 44.0／43.0
250A 2940／3520
73／74 548
12S
70／70 6.5／6.5 15.0 58.8／56.8
300A 2940／3525
75／76 608
12SH
75／80 7.0／7.0 18.5 72.4／71.0
300A 2940／3525
78／79 649
【High pressure type・・・SSTB-H】50Hz／60Hz
Type
Air
quantity
(m3/min)
Static
pressure
(kPa)
Motor
power
(kW)
Rated
current
(A)
Connection
Revolution
per minute
(min-1)
A Sound
level (dB)
Weight
(kg)
3H 5／4 7.5／8.5 2.2 9.2／9.0 80A 2875／3445
65／66 246
4H 10／9 7.5／9.5 3.7 14.4／14.2 100A 2910／3490
67／69 259
5H 17／17 8.5／9.5 5.5 21.4／21.0 125A 2920／3500
70／72 348
6H 24／25 8.5／9.5 7.5 29.8／28.6 150A 2920／3505
73／74 358
8H 36／36 8.5／9.5 11.0
44.0／43.0
200A 2940／3520
74／75 518
10H
50／50 8.5／9.5 15.0 58.8／56.8
250A 2940／3525
75／76 568
12H
70／70 8.0／8.5 18.5 72.4／71.0
300A 2940／3525
77／78 639

- 3 -
■Safety precautions
Be sure to thoroughly read this instruction manual and other attached documents
before installation work, test operation adjustment, maintenance and inspection,
familiarize all about equipment knowledge, safety information, and precautions
before using. In this instruction manual, the rank of safety precautions is classified
as "danger", "warning", "caution".
Meaning of indication
Indication Meaning of indication
DANGER
Indicates contents that could result in death or serious injury if
you handle it with the contents of this indication ignored.
WARNING
Indicates contents that could result in serious injury if you handle
it with the contents of this indication ignored.
CAUTION
Indicates the possibility of being subject to moderate injury or
minor injury, and handling that ignores the contents of this
indication, and it is supposed to cause physical damage.
Meaning of drawing
Drawing mark Meaning of drawing
INSTRUCTION
This is to tell that there is indication to instruct compulsorily your
action.
Contents of the instruction must be described definitely nearly.
PROHIBITION
This is to tell the prohibited action.
Specifically prohibited action are described.
CAUTION
This is to tell that three is a thing to be at attended.
The specifically attended thing is described nearly.

- 4 -
■Read without fail
DANGER
PROHIBITION
Do not drive beyond the capability of the equipment
This machine is designed so that the current value does not exceed
the rated current value during operation at the rated flow rate. If
the discharge flow rate exceeds the rated
flow rate due to, for
example, no resistance at the outlet or downstream from the outlet,
the overcurrent could cause failure or seizure of the motor. Be sure
to use the burner in a manner that the rated current value and rated
flow rate are not exceeded.
ELECTRIC
SHOCK
Electric shock attention
When you remove the cover of a terminal box, please be sure to c
arry out after shutting off a former power supply.
PROHIBITION
Do not disassemble
Because you might be hurt with a turning impeller please never
remove Looking cover while driving.
COMPULSON
Please fix a blower with an anchor bolt on the stable foundation.
COMPULSON
To fix the piping from the blower be sure to provide independent
supports.
PROHIBITION
Do not use the attached gasket for sealing this blower.
Put the replaced old gaskets pouch and throw away them according
to the waste disposal regulation or 「the waste cleaning regulation」.
Never burn up them.

- 5 -
■ Transportation method
As for lifting, please use the eyebolt (2 places)
which is assembled to the main body as shown
on the right.
Never use the handle of the silent cover.
■Installation
1. Secure a space at least 1m around the blower in consideration of disassembly
cleaning and repair.
2. Please avoid the place described below.
･Places sucking the corrosive gases.
･Place with much dust.
･Place that gets wet with rainwater.
･Place where the circumference will be 40 ℃ or more.
3. Fix to the stable foundation firmly with an anchor bolt.
When you install on a steel-materials structure unavoidably, please use the rubber
mount of an option.
4. In order to prevent offset load, please install so that a blower axis becomes
horizontal.
■Piping
1. For the piping, be sure to provide independent supports for fixing, and use the
accompanying rubber joints to protect the blower from the direct impact of load
and vibration from the piping.
2. Piping size should be the same diameter as the blower, or larger size.
3. A straight part of a blower exit pipe more than three times longer than pipe
diameter is required.

- 6 -
■Wire connection of a Motor
Please check the specification of a motor with the name plate stuck on the external
terminal box.
The standard motor is 3 ratings of 200V-50 Hz, 200V/220V-60 Hz of single voltage.
As a special motor, there is also different voltage, such as 380V, 400V, and 440V.
Lead wire
Number of
terminals
Motor
power
kW
Lead wire connection method
Applicable standard
JIS
JEC
3
1.0
3.7
6
5.5
18.5
Applicable standard
IEC
6
5.5
18.5
※Please connect so that there is no short circuit between wires.
※When connecting to the star delta starter please remove the short circuit plate.
(Star delta starting is possible for models with 5.5 kW or more)
※Ground the earth terminal securely.
󳤦
󳤦
󳤦

- 7 -
■Star delta starting
1). Notes on star delta start
There are three electromagnetic contactor type and two magnetic contactor type in
the star delta starting method. 2 Electromagnetic contactor type circuit is simple and
economical, but since voltage is constantly applied to the windings of the motor even
when the motor is stopped, safety during maintenance and inspection, dust and
humidity are high Because it is necessary to pay attention to insulation degradation
between the windings of each motor phase winding and winding to ground at the
place, 3 electromagnetic contact type is recommended.
2). Current detection method of thermal relay
As shown in the figure below, the thermal relay at the star delta start has the line
current detection method and the phase current detection method, and the selection
of the heater rating is different. In the line current detection method, the heater
rating is selected based on the motor full load current. On the other hand, in the
phase current detection method, the heater rating is selected based on the current of
1 / √3 of the full load current of the motor. In this method, the frame size of the
thermal relay can be made smaller than that of the line current detection method,
but since the wiring size of the motor circuit does not change in any detection method,
in the case of the phase current detection method, Since it is necessary to consider
whether wire connection is possible or not, the line current detection method is
recommended.
Line current detection method Phase current detection method

- 8 -
■Startup current and startup time（Voltage AC200V）
1). Standard specification
SSTB Type
Motor
power (kW)
Frequency
(Hz)
Starting current (A) Start time (s)
Direct Star delta Direct Star delta
3S 1.5 50 44.8 - 13.57 -
60 42.2 - 12.86 -
4S 2.2 50 63.7 - 10.03 -
60 61.4 - 9.69 -
5S 3.7 50 101.5 - 8.84 -
60 101.1 - 7.80 -
6S 5.5 50 153.2 76.3 6.21 24.4
60 145.9 63.2 5.51 23.9
8S 7.5 50 217.0 108.0 3.97 14.9
60 199.7 86.4 3.87 15.5
10S 11.0 50 304.1 151.4 4.00 16.3
60 295.8 128.0 3.98 17.8
12S 15.0 50 407.8 203.0 3.60 14.1
60 390.6 169.1 3.80 16.0
12SH 18.5 50 505.4 251.6 3.31 12.5
60 492.5 213.2 3.34 13.5
2). High pressure specification
SSTB Type
Motor
power (kW)
Frequency
(Hz))
Starting current (A) Start time (s)
Direct Star delta Direct Star delta
3H 2.2 50 61.8 - 13.78 -
60 57.9 - 13.68 -
4H 3.7 50 84.1 - 9.26 -
60 97.1 - 12.33 -
5H 5.5 50 139.1 69.3 7.62 30.0
60 140.1 60.6 5.11 22.1
6H 7.5 50 188.0 93.6 5.26 19.7
60 194.0 84.0 3.35 13.4
8H 11.0 50 303.5 151.1 5.91 24.1
60 290.8 125.9 5.39 24.1
10H 15.0 50 423.6 210.9 4.55 17.7
60 387.7 167.8 3.80 16.0
12H 18.5 50 510.4 254.1 3.47 13.1
60 481.9 208.6 3.60 14.6

- 9 -
■About electromagnetic contactor, switch, thermal relay
※Compared with conventional motors, the IE3 motor increases the starting current
by 15 to 30%.
The startup time also tends to become longer.
1). Main circuit voltage 200 to 220 V direct startup (by Fuji Electric)
※ Please use late type thermal relay for thermal relay.
※ When the thermal relay trips, increase the set value of the thermal relay to 5%
We recommend you to.
SSTB Type
Motor power
(kW)
Electromagnetic switch type Thermal type
Settling
range (A)
3S 1.5 SW-0/2L Main circuit AC☐V 1.5kW
Coil AC☐V 1a(1b) TR-0NL 5～8(5)
3H
4S 2.2 SW-0/2L Main circuit AC☐V 2.2kW
Coil AC☐V 1a(1b) TR-0NL 7～11(7)
4H
5S 3.7 SW-4-1/2L Main circuit AC☐V 3.7kW
Coil AC☐V 1a(1b) TR-5-1NL
12～
18(12)
5H
6S 5.5 SW-N1/2L Main circuit AC☐V 5.5kW
Coil AC☐V 2a2b TR-N2L 18～
26(18)
6H
8S 7.5 SW-N2/2L Main circuit AC☐V 7.5kW
Coil AC☐V 2a2b TR-N2L 24～
36(24)
8H
10S 11.0 SW-N2S/2L Main circuit AC☐V 11kW
Coil AC☐V 2a2b TR-N3L 34～
50(34)
10H
12S 15.0 SW-N3/2L Main circuit AC☐V 15kW
Coil AC☐V 2a2b TR-N3L 45～
65(45)
12SH
12H 18.5
SW-N4/2L Main circuit AC☐V
18.5kW
Coil AC☐V 2a2b
TR-N5L 53～
80(53)

- 10 -
2). Main circuit voltage 200 to 220 V Star delta starting (by Fuji Electric)
For the selection in the table below, the thermal relay uses line current detection
and the star electromagnetic switch is selected by the star short circuit method.
※ Please use late type thermal relay for thermal relay.
※ When the thermal relay trips, increase the set value of the thermal relay to 5%
We recommend you to.
SSTB Type Motor power
(kW) Electromagnetic switch type Thermal type Settling range (A)
5H
6S 5.5
MCM:SC-4-0 Coil AC☐V 1a
MC
△
:SC-4-0 Coil AC☐V 1b
MCS:SC-5-1 Coil AC☐V 1a1b
TR-N2LH 18～26(18)
6H
8S 7.5
MCM:SC-4-1 Coil AC☐V 1a
MC
△
:SC-4-1 Coil AC☐V 1b
MCS:SC-N1 Coil AC☐V 2a2b
TR-N2LH 24～36(24)
8H
10S 11.0
MCM:SC-N2 Coil AC☐V 2a2b
MC
△
:SC-N2 Coil AC☐V 2a2b
MCS:SC-N1 Coil AC☐V 2a2b
TR-N2LH 34～50(34)
10H
12S 15.0
MCM:SC-N2 Coil AC☐V 2a2b
MC
△
:SC-N2 Coil AC☐V 2A2b
MCS:SC-N2 Coil AC☐V 2a2b
TR-N3LH 45～65(45)
12SH
12H 18.5
MCM:SC-N2S Coil AC☐V 2a2b
MC
△
:SC-N2S Coil AC☐V 2a2b
MCS:SC-N2 Coil AC☐V 2a2b
TR-N3LH 53～80(53)
MCM: Electromagnetic contactor for power
MC Δ: Electromagnetic contactor for delta
MCS: Electromagnetic contactor for star (star short circuit)

- 11 -
■Before starting operation
＜Check of direction of rotation＞
1． Rotate the impeller slowly by turning ON/OFF the started switch instantaneously.
2．Looking through the rotation instruction cover, check whether the rotation
confirmation mark (yellow) on the spindle shows the same direction as the direction
of the arrow.
If not, turn OFF the main power immediately, and correct the connection.
＜Starting operation＞
1．Turn on the start switch of a blower.
2．When the blower becomes steady, increase the load to the maximum level, and check
whether the current value of the motor is not above the rated value. (Never run the
motor under overloaded condition.)
3．If the operating air quantity is reduced excessively, a surging phenomenon (pressure
fluctuation like waving) may occur. If such phenomenon occurs, it is advisable to
provide a vent valve on the delivery side.
■Maintenance inspection
Please inspection and maintenance in the following way.
1．Even if there is not abnormality, please do the inspection in the main body of
impeller and blower once a year.
2．Occasionally check the tightening of the bolts of each part.
3．Always pay attention to the abnormal sound, vibration, overheat of the blower
body and any other abnormality.
4．Please rolling up the dirty roll filter and clean it.
●Roll filter
Please check the filter periodically, and before it starts decreased pressure by the clog
of dust etc., Rolling up a roll filter.
The roll filter is supposed to be replaced by rolling up once every week or so, but this
replacement frequency may be adjusted according to the usage and the environment.
One roll filter lasts for about one year.

- 12 -
●Detailed view of roll filter
●Rolling up the roll filter
1．Loosen the wing nut B.
2．Release the latch to open the presser foot.
3．Rolling up one circumferential amount of the filter.
4．Put the presser foot back to the former state with the latch.
5．Cut off the soiled portion of the filter.
6．Tighten the wing nut B.
●Exchange of a roll filter
1．Loosen the wing nut A and open the roll box.
2．Remove the wing nut B and pull out the roll receiving pin.
3．Insert a new roll filter and insert the roll receiving pin.
4．Tighten with the wing nut B and fix.
5．Pass the tip of the filter through the inside of the guide roller as shown in the
figure.
6．Return the roll box to its original position.
7．Tighten the wing nut A and fix the roll box
●A filter kind and pressure loss
There are 3 filter types as listed below Please use properly according to usage
environment.
As of shipping from our facilities, the filter of medium roughness (RF-M) type has
been provided.
Type Model Sieve opening
（mm）
Pressure loss (Maximum)
※
Coarse mesh RF-☐☐-L 2.5 Less than 0.06kPa
Medium mesh RF-☐☐-M 1.3 Less than 0.10kPa
Fine mesh RF-☐☐-S 0.6 Less than 0.20kPa
※Pressure loss (Maximum) is a value at the time of the maximum air quantity in each
model. When ordering, make an entry in the ☐☐ spaces as follows.
ＳＳＴＢ－３，４ →３ ４
ＳＳＴＢ－５，６ →５ ６
ＳＳＴＢ－８，１０ →８ １

- 13 -
ＳＳＴＢ－１２ →１ ２ ０
■Disassembly
＜Blower body inside side＞
1．Pass a wire or the like through the eye bolts② attached to the cover⑫, hoist the
blower body①, and fix the blower body① in the hoisted position
2．Remove the bolts from the cover⑫, and separate the cover⑫ from the blower body①.
3．Release the fixing teeth of the bearing washer⑩, and remove the bearing washer⑩
together with the bearing nut⑪ and the collar⑨.
4．Remove the impeller⑧, and remove the key⑦.
5．Remove the positioning collar⑥.
＜Silent cover side＞
1．Remove the Wing nut㉑ and pull out a Filter support⑱ than a Rod bolt⑯.
2．Disconnect the wiring and remove the Terminal box○
A.
3．Remove the Bushing○
C and Lock nut○ D from the Connector○ E, push the Plica tube○ F
to the inside of the cover.
4．Remove the bolt from the cover support㉕ and silent cover⑮, and separate the silent
cover⑮ from the blower body① by using the cover knob.
Now, the disassembly of the inside of the main body and silent cover unit is completed.
In the case of assembling, please go in the inverse order mentioned above.
●Precautions for assembly
1．Never scratch or bruise the shafts and meshing parts.
2．Apply high quality machine oil to the shaft, etc., after cleaning.
3．Tighten the bearing nuts firmly and fix them bending the pawls of the bearing washers.
4．Upon completion of assembly turn the blower shaft by a hand to confirm that it moves
as smoothly as before disassembly.
■Structure drawing
●Terminal box
A
Terminal box D Lock nut
B
Box support E Connector
C
Bushing F Plica tube

- 14 -
●Roll filter type
1
Blower Body 17 Silent Pad
2
Eye Bolt 18 Filter Support
3
Base 19 Roll Filter
4
Motor Support 20 Punching Metal
5
Motor 21 Wing Nut
6
Fixed Position Collar
22
Graduation Plate
7
Key 23 Shaft
8
Impeller 24 Butterfly Handle
9
Press Collar 25 Rubber Joint
10
Bearing Washer 26 Mate Flange
11
Bearing Nut 27 Packing(NR)
12
Cover 28 Roll Receive Pin
13
Looking Cover 29 Roll Box
14
Looking Label 30 Split Flange
15
Silent Cover 31 Packing
16
Rod Bolt 32
Butterfly Damper Body
●Wire mesh type
Specifications are subject to change without notice for improvement.
2020.8
1
Blower Body 16 Rod Bolt
2
Eye Bolt 17 Silent Pad
3
Base 18 Filter Support
4
Motor Support 19 Filter
5
Motor 20 Filter Press
6
Fixed Position Collar
21
Wing Nut
7
Key 22 Graduation Plate
8
Impeller 23 Shaft
9
Press Collar 24 Butterfly Handle
10
Bearing Washer 25 Rubber Joint
11
Bearing Nut 26 Mate Flange
12
Cover 27 Packing(NR)
13
Looking Cover 28 Split Flange
14
Looking Label 29 Packing
15
Silent Cover 30
Butterfly Damper Body