York YBAH Series Instruction manual

Air Flow：1500~15000 m
3
/h
YBAH-G CEILING
AIR HANDLING UNIT
Installation, Operation & Maintenance Manual FORM NO.
6A6Y-A02C-NA-EN

1
Contents
1. UNIT INSTRUCTION 2
1-1 I NSTRUCTION 2
1-2 M AIN T ECHNICAL D ATA 3
1-3 U NIT D RAWING 5
1- M AIN C OMPONENTS 6
1-5 T I O
2
YBAH A SSEMBLY 6
1-6 E LECTROSTATIC P RECIPITATION 11
2. TRANSPORTATION & INSTALLATION 12
2-1 T RANSPORTATION 12
2-2 A CCEPTANCE 12
2-3 S TORAGE 12
2- L IFTING OF THE UNIT 12
2-5 P OINTS FOR A TTENTION BEFORE I NSTALLATION 12
2-6 P OINTS FOR A TTENTION DURING I NSTALLATION 12
2-7 B RIEF I NTRODUCTION TO THE I NSTALLATION 13
3. START, COMMISSIONING AND RUNNING 16
3-1 C HECK BEFORE S TART UP 16
3-2 E LECTRIC W IRING D IAGRAMS 17
3-3 F AN P ART 18
3- C HECK THE FAN BEARING 18
3-5 M OTOR 18
3-6 A DJUSTMENT OF BELT & BELT PULLEY 19
3-7 M ECHANICAL I NSPECTION 19
3-8 U NUSED FOR AN O VER - LONG PERIOD 19
3-9 P OINTS FOR A TTENTION DURING S TARTING O PERATION 20
. MAINTENANCE AND REPAIRING 21
-1 F ILTER P ART 21
-2 C OOLING COIL AND H EATING C OIL 21
-3 F AN PART 21
- M OTOR 22
-5 R EPLACEMENT OF MOTOR 22
-6 C URRENT AND ADJUSTMENT 22
-7 P OINTS FOR A TTENTION D URING M AINTENANCE 22
5. FAILURE ANALYSIS 2
5-1 L OW A IR F LOW R ATE 2
5-2 H IGH A IR F LOW R ATE 2
5-3 H IGH -L EVEL N OISE 2
5- B ELT B REAKING 2

Unit Instruction
2
1. Unit Instruction
1-1 Instruction
YORK YBAH series ceiling-mounted air handling units are terminal points of central air-conditioning
systems. They are designed for fresh air units or to cool, heat, humidity and de-humidify, filter and clean
the air, etc. The conditioned air can be delivered to locations across various distances via specially
designed ducts. The units are especially suitable for the air-conditioning of commercial buildings and
industry applications.
YORK YBAH series air handling units have 12 different models. The cooling capacity ranges from 8kW
to 252kW, and air flow from 1500m3/h to 15000m3/h. Rated external total pressure ranges from 175Pa
to 315 Pa. More external total pressure can be provided for flexible application.
Each single skin unit is made from galvanized steel with 15mm thick polyester fiber inner insulation. It
contains a built-in cooling coil and fan, and externally mounted nylon air filters.
Cooling and heating coil use copper tubes with aluminum fins. The fan, motor and belt pulley are all
high-quality products producing stable and efficient performance. The fan is a forward curved
centrifugal model that works on double air inlets. The motor features IP55 and a type mounted filter can
be withdrawn from side or bottom. For double skin unit, the filter only can be withdrawn from side.
Feature
 Easy installation
 Lower unit height for low head floor ceiling application
 Low noise
 Filter can be withdrawn from side or bottom

Unit Instruction
3
Nomenclature:
1-2 Main Technical Data
Model
Airflow
(m
3
/h)
Nominal
external total
pressure (Pa)
Nominal cooling capacity (kW) Nominal heating capacity (kW)
Fan type Motor type
Motor
power(kW)
Weight (kg)
Return air
condition
Fresh air
condition
Return air
condition
Fresh air
condition
N H N H N H N H N H N H
YBAH1FB-G 1500 145 70 8.3 11 18.6 24.2 13.5 16.6 19.8 23.7
High
efficient,
double air
inlets
forward
curved
3-Ø
asynchronous
motor, F class
insulation, IP55
0.55 64 66
YBAH02B-G 2000 165 90 11.3 15.1 24.4 31.7 18.9 21.8 26.4 31.3 0.55 68 71
YBAH2FB-G 2500 215 135 13.6 18 29.5 38.4 22.3 26.8 32.7 38.5 0.75 77 80
YBAH03B-G 3000 205 130 16.8 22 36.2 47.6 28.3 33.3 41 46.8 0.75 85 90
YBAH04B-G 4000 260 185 22.5 29.5 50.5 63.8 37.4 46 53.5 61.8 1.1 107 112
YBAH05B-G 5000 235 160 28.3 37 63.1 80.1 47.1 56.6 65.7 77.4 1.5 134 142
YBAH06B-G 6000 220 145 33.7 44 72.6 95.4 58.1 64.6 79.3 92.7 1.5 147 156
YBAH07B-G 7000 220 140 39.1 50.4 80.7 104.7 64.8 77.3 89.9 108 1.5 157 167
YBAH08B-G 8000 260 170 45.6 58.8 96.7 128.2 75.7 90 106.4 130.1 2.2 173 187
YBAH10B-G 10000 300 215 62.3 78.2 133.8 170 103.6 118.7 149 168.6 3 214 234
YBAH12B-G 12000 255 170 75 93.7 157.9 204.5 124.4 140.9 177.3 202.6 3 274 300
YBAH15B-G 15000 315 230 93.4 117.1 197.1 252.9 154.9 176.8 221.5 251.1 4 306 338

Unit Instruction
4
Notes
1. The weight listed in the table is the shipping weight. The operation weight of unit is about 20%
more than the shipping weight.
2. Standard return air cooling conditions air inlet at 27°C DB/19.5WB; chilled water inlet/outlet at
7°C/12°C.
3. Standard return air heating conditions air inlet at 21°CDB; hot water inlet/outlet at 60°C/50°C.
4. Cooling conditions of fresh air unit air inlet at 35°C DB/28°C WB; chilled water inlet/outlet at
7°C/12°C.
5. Heating conditions of fresh air unit air inlet at 7°C DB; hot water inlet/outlet at 60°C/50°C.
6. External total pressure the sum of velocity pressure and static pressure at the air discharge outlet
(exclude the pressure drop across the unit)
7. For four-piped unit, heating coil is in the front of the cooling coil in the direction of air flow.
8. If the unit has TiO2, evaporative humidifier or split coil (cooling + heating) option, the external total
pressure should be deducted by the responding air drop pressure.
The unit performance is based on 5m altitude, the variance of altitude will affect the unit performance.
Altitude correction factors：
Altitude(m) 300 900 1200 1500 1800
Total heat 0.99 0.97 0.96 0.94 0.93
Sensible heat 0.96 0.90 0.86 0.93 0.80
Note The above is only for reference. Please contact our local office for detailed data.

Unit Instruction
5
1-3 Unit Drawing
Single Fan unit Double Fan Unit
Model
De. Wi. He. Supply air flange size Piping position
Return air
flange size
A B C D E F G H
J K
L
M N
P Q
N H N H N H N H
YBAH1FB-G 680 800 417 402.5 259 228 - 75.2 55.2 51.9 66 72.7 370 128.5 128.5 343.5 343.5 660 320
YBAH02B-G 680 865 417 417.5 259 228 - 75.2 55.2 51.9 66 72.7 370 128.5 128.5 343.5 343.5 725 320
YBAH2FB-G 680 1005 417 495.5 259 228 - 75.2 55.2 51.9 66 72.7 370 128.5 128.5 343.5 343.5 865 320
YBAH03B-G 800 1005 458 511.5 287 256 - 87.2 95.9 98.7 199.6 205.5 550 137.7 148.5 351.5 358.9 865 361
YBAH04B-G 880 1190 485 539.5 298 262 - 98.2 86.2 98.7 229.7 237 540 137.5 130.3 406.7 395.3 1050 388
YBAH05B-G 880 1450 485 611 232 262 184 80.5 86.2 99 229.7 237 540 137.5 130.6 406.7 395.6 1310 388
YBAH06B-G 880 1680 485 612 298 262 244 80.5 86.2 99 229.7 237 540 137.5 129.9 406.7 395.6 1540 388
YBAH07B-G 800 1810 550 609.5 331 289 264 90.5 60.5 64 66 88 368 129.9 129.9 461.7 461.7 1670 453
YBAH08B-G 800 2050 550 619.5 331 289 264 90.5 60.5 64 66 88 368 129.9 129.9 461.7 461.7 1910 453
YBAH10B-G 940 1870 752 704.5 471 404 - 113.5 63.3 76 82.5 110 423 129.9 129.9 677.6 677.6 1730 655
YBAH12B-G 940 2170 752 690 395 341 324 113.5 63.3 76 82.5 110 423 129.9 129.9 677.6 677.6 2030 655
YBAH15B-G 940 2645 752 807.5 373 404 294 113.5 63.3 76 82.5 110 423 129.9 129.9 677.6 677.6 2505 655

Unit Instruction
6
Coil connection size ：
Model Cooling coil Heating coil
Nominal capacity High capacity 1 row 2 rows
YBAH1F
Φ34 Φ34
Φ34 Φ34
YBAH02
Φ34 Φ34
Φ34 Φ34
YBAH2F
Φ34 Φ34
Φ34 Φ34
YBAH03
Φ34 Φ48
Φ34 Φ34
YBAH04
Φ48 Φ48
Φ34 Φ34
YBAH05
Φ48 Φ60
Φ34 Φ34
YBAH06
Φ48 Φ60
Φ34 Φ34
YBAH07
Φ48 Φ60
Φ34 Φ48
YBAH08
Φ48 Φ60
Φ34 Φ48
YBAH10
Φ60 Φ76
Φ48 Φ48
YBAH12
Φ60 Φ76
Φ48 Φ48
YBAH15
Φ60 Φ76
Φ48 Φ48
Notes
1. When G is“-”, the unit has only one air supply duct connection.
2. The coil pipe connections use male threads (thread code R2).
The corresponding imperial diameters are
34mm---1” 42mm---1-1/4” 48mm---1-1/2”
60mm---2” 76mm---2-1/2” 89mm---3”
3. The condensate pipe connections use 34mm O.D. male threads (thread code R2).
4. All dimensions are SI unit (mm).
1- Main Components
The main components of York YBAH air handling unit include
Main accessories
YBAH1F-15 adopts SYT series double-inlet forward-inclined centrifugal fan.
The belt drive series motor adopts the IE3 series three-phase asynchronous motor, the insulation class
is F, and the protection class is IP55.
Optional accessories
Electrostatic precipitator
TiO2 YBAH module
1-5 TiO
2
YBAH Assembly
The TiO2 YBAH assembly consists of two parts sterilizer and sterilizer frame. If the customer selects the
TiO2 YBAH assembly, it has been installed in the YBAH unit before ex- factory.

Unit Instruction
7
TiO
2
YBAH Assembly
1-5-1 TiO2 assembly installation
The TiO2 YBAH assembly is installed in the air-inlet of the YBAH unit (The Figure shown as below), which
has been installed before ex- factory.
Component list of TiO2 YBAH Assembly
Model TiO
2
model Connection frame Qty
Connection flange dimension Lamp input
power（W）
P,mm Q,mm
YBAH1F TiO
2
YBAH1F 1 710 320 3×18
YBAH02 TiO
2
YBAH02 1 795 320 3×18
YBAH2F TiO
2
YBAH2F 1 950 320 3×18
YBAH03 TiO
2
YBAH03 1 980 371 4×18
YBAH04 TiO
2
YBAH04 1 1120 411 4×18
YBAH05 TiO
2
YBAH05 1 1260 460 4×18
YBAH06 TiO
2
YBAH06 1 1460 460 6×18
YBAH07 TiO
2
YBAH07 1 1700 460 6×18
YBAH08 TiO
2
YBAH08 1 1910 460 9×18
YBAH10 TiO
2
YBAH10 1 1710 639 12×18
YBAH12 TiO
2
YBAH12 1 2010 639 12×18
YBAH15 TiO
2
YBAH15 1 2485 639 18×18
Notice Ultraviolet Lamp Power 18W/Piece

Unit Instruction
8
1-5-2 Ultraviolet Lamp Installation, disassembling
The ultraviolet lamp is delivered with the unit but is not installed in the unit, thus, it should be mounted
in the unit before being powered on and put into service. It is recommended to install the lamp
according to steps as below before the unit is connected to the external air inlet duct：
YBAH1F—YBAH08 unit:
Step 1 disassemble the fastening screw of Junction box, take off Junction box.
Step 2 disassemble the fastening screw of side cover plate, remove side cover plate & disjoin the
connector of cable, take off side cover plate.
Step 3 take out nylon filter and front, rear TiO2 aluminum filter Step 4 take out the base of TiO2
Lampe
Step 5 Ultraviolet Lamp Installation, operation, maintenance
Notice The installation should be according to steps in the reverse order.

Unit Instruction
9
YBAH10-YBAH15 unit:
Step 1 disassemble the fastening screw of Junction box, take off Junction box
Step 2 disassemble the fastening screw of side cover plate, remove side cover plate & disjoin the
connector of cable take off side cover plate.
Step 3 take out nylon filter and front, rear TiO2 aluminum filter Step 4 take out the base of TiO2
Lampe
Step 5 Ultraviolet Lamp Installation, operation, maintenance
Notice The installation should be according to steps in the reverse order.

Unit Instruction
10
Wiring of TiO2 YBAH Assembly is as follows
1. TiO
2
YBAH1F assembly ~ TiO
2
YBAH08 assembly
2. TiO
2
YBAH10 assembly ~ TiO
2
YBAH15 assembly
1-5-3 Operation
The operating power supply of the sterilizer ultraviolet lamp is a single-phase, 220V.voltage power
Do not stare at the ultraviolet lamp for a long time, avoiding any possible injury to your eyes.
The starting of the sterilizer is under chain- control together with the proper unit (the wiring of the chain
control should be connected by users), that is, the sterilizer starts operation as the internal fan is enabled
to operate; it is closed as the internal fan stops operation
1-5- Maintenance
1. The filter and the aluminum mesh should be cleaned regularly. It is suggested that the filter should
be cleaned once a month and the aluminum mesh should be cleaned every three months.
2. The aluminum mesh is powder-coated with TiO2 and cannot be washed with water; if there is dust
adhering to on the aluminum mesh, it should be removed by the blowing air.
3. Both the sterilizer, aluminum mesh and filter screen of the TiO2 YBAH assembly adopts the under-
pulling-out (or front disassembly) installation method.
Before the TiO2 YBAH assembly is repaired, stop and unplug the unit. Disassemble the sterilization lamp
carefully to avoid any damage to it

Unit Instruction
11
NOTE
TiO2 Assembly has been assembled in the factory. Before leaving the factory, it has been checked
and inspected strictly, and installed into and packed with the unit well in accordance with the
specifications. Normally, the sterilizer and the unit should thus be kept in good condition when
arriving at the acceptance place. Before the sterilizer and the unit are shopped, check whether there
is any possible damage to them during the transportation. If there is any obvious damage observed,
write it down onto the transportation receipt of the freighter. Based on the indication of the advice
note, you can claim for the damage. If there is damage to other parts other than the surfaces,
please inform the local maintenance personnel of the York Company informed of it immediately. Our
York Company will not be responsible for any loss of or damage to the sterilizer and the unit
occurred during the transportation or after they have been accepted by the receiving party.
1-6 Electrostatic Precipitation
1. Electrostatic Precipitation should be interlocked control with fan motor, Electrostatic Precipitation turn
on when the fan motor start; Electrostatic Precipitation turn off when the fan motor stop.
2. There will be high-voltage when EP is working, don’t touch EP or get into EP segment when EP is
running to avoid Electrical shock.
3. Don’t start and cut off EP frequently, to avoid influencing the service life.
4. EP should be maintained regularly; the maintenance person must be specialized and qualified; power
supply must be cut off before maintenance.
5. To ensure EP run normally, dust collector must be washed regularly, normally, a thorough cleaning
each two months, and more frequent cleaning is needed (one time per month) if the working condition
is special.
6. After running for a period, the ionizer wire may break, the efficiency will decrease slightly. However,
the unit will continue to operate with a broken ionizing wire as long as the broken wire has not caused
a short circuit of the unit. Remove all loose and broken wires as soon as they are identified.
7. If EP is installed in a location that is dusty and dirty, the sensor will be coated with dirt and lint, and
this coating will keep sensors from operating properly. Inspection regularly is needed and clean the
sensor in time.

Transportation &
Installation
12
2. Transportation & Installation
2-1 Transportation
a. The packed unit should be prevented from collision, overturning, crushing or rain or snow during the
transportation.
b. When moving the unit, please handle with care and prevent the coil water inlet and outlet pipes
from collision, avoiding any damage to deformation of the unit.
2-2 Acceptance
Before leaving the factory, the YBAH air treatment unit have been tested and inspected and packed
properly. When the unit is transported to the destination, it is required to carry out an inspection on the
unit to ensure that the unit is kept in good condition. If it is found that there is any damage to the unit,
describe it in the transportation list and demand a signature for confirmation from the personnel of the
transportation company. Otherwise, the York Company will not take any responsibility for it.
2-3 Storage
If the unit is stored outdoors, it should be protected against the corrosion from water, moisture, rusting
or dust.
2- Lifting of the unit
During the erection process, be careful to prevent the unit from any damage due to improper
operations, and put a corrugated sheet on the place where the unit lifting rope contacts the unit,
avoiding damage to the surface of the unit due to the rope.
2-5 Points for Attention before Installation
Before the unit is installed, the following should have been supplied at the same time during the
construction of the building.
1. Water Supply
2. Power Supply
3. Fresh air duct and return air duct
4. Ceiling Suspension Shackle
The item 4 above is very important. Especially, in case of that the top-end of the suspension shackle
has been fixed into the cement, the interval between shackles should be accurate; only if it is in
consistent with the installation distance specified in the unit design drawing can the installation be up to
the accuracy. Any inaccurate position or the displacement of water pipe will cause the delay of the time
limit of installation; or any change on site will result in the raising of installation cost.
2-6 Points for Attention during Installation
During the installation, be careful not to make the plaster stone, paint or dirt deposit on the panel,
electromotor or fan blades, also not to damage the panel and the heat preservation layer during the

Transportation &
Installation
13
installation. Before the unit starts operation, all dirt in the water collecting tray and the water drain pipe
should be removed.
Note
If there is dirt on the motor or the fan blades remained, the York Company will not provide
any effective maintenance and repairing service.
2-7 Brief Introduction to the Installation
2-7-1 Hydraulic Pipeline
All water inlet and outlet pipes should be constructed according to the design drawing and the York
sample drawing. On the other hand, the hydraulic pipeline must be laid in accordance with the accurate
space dimensions, ensuring that the pipeline is connected correctly. Space should be remained outside
all water pipe paths, which should be big enough to hold the power supply and control lines (if
required), or to lay the insulating layer.
The collector of the hot or cold coil pipe has been equipped with the air exhaust and water drainage
plugs. The exhaust valve is set on the highest point of the water-outlet collector and the water-escape
valve is places in the lowest point of the water inlet collector.
The safety device should be installed in the inlet system of the hot water coil pipe to prevent the internal
temperature of the unit from exceeding 60℃ in case of that the fan stops operation.
To tighten an external pipe, always hold the coil pipe by using a pipe wrench to avoid damages to the
manifold, as shown in the following figure
2-7-2 Pipeline Support
The weight of every water pipe should be sustained by the support and should not be borne by the unit.
Meanwhile, enough free space should be reserved for the water inlet, outlet and drain pipe interfaces.
If the hot water and cold water shares the same duct, the water pipe diameter will be subject to change
due to contraction and expansion. If the pipe is fixed firmly without any free space considered in
advance, it very likely will suffer from bursting or damage.

Transportation &
Installation
14
2-7-3 Determination of Water and Directions of the Unit
The water inlet and outlet pipe interfaces can be arranged in the right or left side of the unit. With
viewing from the unit air inlet (or along the air flow direction), if the water inlet and outlet ducts are at the
right side of the unit, the unit is called a Right-style Unit; conversely, it is a Left-style Unit. Pay attention
to distinguish between Right-style and Left style units when the pipe is connected.
2-7- Air Venting of the Coil
Each unit has a manual venting valve at the highest point of the coil. With the valve opened, the gas
stored in the coil can be released, keeping the unit in a stable flow of hot water and in a well-distributed
heat exchange condition. The air accumulated in the coil should be exhausted regularly.
2-7-5 Condensed Water Drainage
2-7-6 Air Duct Connection
The connecting between the return air duct and the external filter frame and that between the air outlet
flange and the air delivery duct must be flexible. The hard connection between the unit and the air outlet
flange must be prohibited. During the installation, the air duct should be provided with a support for its
exclusive use and its weight should not be carried by the unit, avoiding applying any extra load to the
unit.
2-7-7 Lifting Shock Absorbing
The hoisting equipment should be equipped with a shock absorber of good performance, preventing the
unit from the production of resonance and the increasing of low-frequency noise. It is suggested that
the shock absorber be installed at the side near the unit.

Transportation &
Installation
15
Points for Attention during Installation
1. The unit should be installed horizontally in order to ensure free water drainage and a normal
operation.
2. There should not be any foreign substance piled up in the water drain tray; and all foreign matters
should be removed from the tray. Only if the water drain path is guaranteed to be unobstructed can
the unit be started up.
3. All cooling water pipe valve and cold water pipe of the unit should be supplied with the anti-
condensing water protection. Unless the cooling water pipe valve and cold water pipe are provided
with a heat insulating layer, the extended tray should be installed in the cooling water pipe valve and
the cold water duct when they are installed in the construction field.
4. The connecting length of the air duct should not be greater than that defined by the remained
pressure in the unit. Moreover, the air duct is not allowed to bear any load and should be connected
to the unit.
5. The ceiling suspension unit can only be installed in the place where burning is not to be triggered.
6. The condensed water discharge duct must be installed with an external water seal device.
7. Demand on water quality the soft water is recommended to be used in order to keep the unit
under a good operating condition.

Start,
Commissioning
and Running
16
3. Start, Commissioning and Running
3-1 Check before Start up
Check the YBAH unit before it is started：
1. Remove the interior and exterior dust from the unit.
2. Check whether there is any component loose in the unit.
3. Check all moveable parts and observe whether they can rotate freely.
4. Inspect all electrical connecting devices connected to the motor, lamp and control equipment and
check whether the wiring is correct, whether the power supply can meet the requirement. Arrange
the protection devices for short-circuit, overload and phase loss at the power lead-in side; check all
earthed system.
5. Clean the condensed water inlet and outlet U bends and fill proper water into them.
6. Perform the system water pressure and air ventilation tests.
7. Before the fan starts operation, check the air path, the flexible sleeve tube or the conduit coupling
device.
8. Check the fin surface of the coil. If required, card it with a Coil Pipe Comb.
9. For the belt-driven unit, check the tension of the belt, which should be in accordance with the
following figure (Belt Tension Indicating Drawing).
10. Check whether the rough filter has been installed in place and ensure that there is no construction
debris or foreign substances attached to it.
11. Check whether the connection duct has been installed properly and the water flow is up to the
standard.

Start,
Commissioning
and Running
17
3-2 Electric Wiring Diagrams
Electric connection：
1. The direct start schematic diagram (Fig.1) is for motor up to 5.5kw. The Y-△ start schematic (Fig.2)
for motors more than 7.5kw.
2. The dashed lines is provided by customer and it should be connected according to Fig.1 or Fig.2.
Please ensure that all connections are tightened.
3. All electric connections should comply with local electric installation codes.
4. The ground terminal of the unit must be connected to the ground terminal in the control panel.
5. Customer should connect the power and control devices and supply short-circuit and over heat
protection.
6. The phase sequence protector is required to install and connect its normal-open port to the
contactor in order to avoid burning out the motor due to phase loss.
Note for placing an order：
1. Factory can offer supply power at 380V 3N~50Hz or 380V~415V 3N~50Hz.
2. The unit is equipped with plate type pre-filters at the return air intake.
3. When placing an order, the pipe direction (left connection or right) should be noticed (note facing
the return air intake, it is the right if the inlet/outlet water pipes are on the right side of unit, vice
versa).
4. The airflow rate and total pressure should be noticed when placing an order.
5. If starter is required, it should be noticed when placing an order (an option)

Start,
Commissioning
and Running
18
3-3 Fan Part
1. Switch off the master switch before carrying out an internal inspection to the fan.
2. Check whether the electrical connection device of the unit is in consistent with all circuit diagrams.
3. Check the motor’s name plate and observe whether the rated voltage, phase and circuit are in
consistent with the power supply recorded in field.
4. Before the fan starts operation, check first whether there is foreign matter in the fan housing, then,
rotate the fan blade manually and check whether there is any collision and friction observed between
the fan blade and the housing; listen whether there is abnormal noise produced from the bearing.
You can never start it till no abnormality is found.
5. After the power is switched on, start the fan first and check whether it rotate in a specified direction.
If not, stop the fan and change the power phase sequence; then, connect it with the power supply
formally.
6. Check the motor operating current with an ammeter and compare the obtained current value with the
data indicated in the motor name plate.
3- Check the fan bearing
All the belt drive fans use the bearing no grease nipple.
Should be inspected the fan before it starts, please contact our service man if anything is abnormal.
Turn the wheel of the fan to check the abnormal noise, for example regular friction noise, shrill noise
etc.
Observe the spillage lubricating grease from bearing and if the color turn to black or not.
1. If need, clean the bearing and replace the obsolete lubricating grease. Must inspect the fan status if
it has not been operating over one month.
2. Lubricating grease replacement steps firstly, remove the bearing cap and wash the bearing by
gasoline, after it’s dry, fill in lubricating grease. The lubricating types is ALVANIA RL2 or GOLD
GREASE No.3, fill in full lubricating grease.
3. Please replace the bearing if it is damaged or rust. When installation, should tap the sleeve instead
of other part of the bearing. Trail run for 15 minutes to make sure it can operate.
3-5 Motor
It is possible to store the rotation equipment for a certain period of time. Even if the storage time and
condition meet the specifications, a series of electrical and mechanical checks are still necessary.
For the motor of 7.5kw or above, it should be equipped with a voltage dropping starter, avoiding the over
starting current.
Storage conditions
The motor should be stored in a dry environment, in which if the humidity exceeds 90%, the motor
insulation device will be damaged soon; when the humidity is up to 100%, the insulation device will lose
its function completely.
Ambient temperature
The ambient air temperature changes with the seasons but will not be greater than 40℃.

Start,
Commissioning
and Running
19
3-6 Adjustment of belt & belt pulley
Adjustment of smoothness
For the belt drive unit, inspect the smoothness of the fan and motor belts with a ruler, that is, points of A,
B, C and D should be in the same line; otherwise, it is needed to adjust the smoothness of the belt pulley.
Belt Adjustment
1. Before the starting and operation of your unit, check the tension of the belt.
2. After one-week operation, the belt will be expanded slightly. In this case, readjust the tensile force
applied to the belt and make it comply with the specifications listed in the belt Tension Indicator.
3. After 30-day operation of the unit, check the tension of the belt again.
4. After one-quarter operation of the unit, make a complete inspection.
3-7 Mechanical Inspection
When contacting the air, the grease used to lubricate the bearing will suffer from oxidation or even
deterioration.
If the oxidized lubricating grease is applied to, the bearing of the motor will be damaged soon.
Storage Time
If the motor is lubricated just before it operates, a more effective lubricating effect can be obtained.
3-8 Unused for an Over-long period
If the motor of the unit has been unused for a long time, the incidents described above may occur.
In order to avoid the problems above, it is suggested to adopt an anti-condensation heater and perform
a routine repair.