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Fig. 1 – Fan Lifting Lug Details

Handling

Lift the fan by the base or lifting lugs. Never lift by the shaft, motor, housing or wind band.

See Fig. 1 – Fan Lifting Lug Details.

INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Bulletin: 77-03-NOVEMBER 2007

Receiving and Inspection

Carefully inspect the fan and accessories for any damage and shortage immediately upon receipt of the fan.

• Turn the wheel by hand to ensure it turns freely and does not bind.

• Inspect the dampers (if supplied) for free operation of all moving parts.

This publication contains the installation, operation and maintenance instructions for standard units of the

AXIJET – High Plume Exhaust Systems:

• Steel Axijets, model Axijet-S size 1825 through 7300

• FRP Axijets, model Axijet-F size 1225 through 4900

MK Plastics catalog on AXIJET® High Plume Exhaust Systems provides additional information describing the

equipment, fan performance, available accessories, and specifications.

For additional safety information, refer to AMCA publication 410-96, Safety Practices for Users and Installers of In-

dustrial and Commercial Fans.

Page1

AXIJET® High Plume Exhaust

RNING

This unit has rotating parts. Safety precautions

should be exercised at all times during installation,

operation, and maintenance.

ALWAYS

disconnect power prior to working on

fan.

Summary of content (14 pages)

PAGE 1
Bulletin: 77-03-NOVEMBER 2007 AXIJET® High Plume Exhaust INSTALLATION, OPERATION, AND MAINTENANCE MANUAL This publication contains the installation, operation and maintenance instructions for standard units of the AXIJET – High Plume Exhaust Systems: • • Steel Axijets, model Axijet-S size 1825 through 7300 FRP Axijets, model Axijet-F size 1225 through 4900 MK Plastics catalog on AXIJET® High Plume Exhaust Systems provides additional information describing the equipment, fan performance, available access
PAGE 2
Similar handling precautions must be used for the inlet plenum. Never lift from the access door handle, outlet drain, and any dampers that might be attached. Use rigging straps wrapped around the plenum from top to bottom if necessary; larger size plenums will be supplied with lifting lugs or ready to be assembled on the job site. See Fig. 2 – Plenum Lifting Lugs. Fig.
PAGE 3
Axijet Standard Curb/Fan Rail Assembly Fig. 3 – Standard Support Layout Fig. 4 – Standard Rail Fixing Detail Refer to Fig. 3 & Fig. 4 for the following instruction. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Page 3 Mount the isolators on the Axijet fan isolation support bracket (this bracket is only available on steel Axijet fans, on FRP Axijets the isolators will be mounted onto isolator holes on the underside of the fan stand). Place the fan isolator assembly on the fan rails section.
PAGE 4
Axijet Combined Fan and Plenum Equipment Support Assembly Fig. 5 - Combined Support Layout Fig. 6 – Combined Support Rail Fixing Detail Refer to Fig. 5 & Fig. 6 for the following instruction. 1. Mount the isolators on the Axijet fan isolation support bracket (this bracket is only available on steel Axijet fans, on FRP Axijets the isolators will be mounted onto isolator holes on the underside of the fan stand). 2. Place the fan isolator assembly on the fan support section of the fan/plenum curb assembly.
PAGE 5
Floor Mounted Vibration Isolators To prevent vibration and noise from being transferred to the building, vibration isolators are recommended. Isolators should be located between the fan and the rails. MK Plastics supplies two main types of isolators for Axijet fans: • • Floor Mounted Spring Isolators (steel & FRP Axijets) Floor Mounted Rubber-In-Shear Isolators (FRP Axijets) In applications where seismic isolators are required, contact MK Plastics directly for further details . Fig.
PAGE 6
Drains Axijet fans and bypass air plenums are provided with integral drains. These drains are plugged at the factory prior to shipment. Properly designed systems operating under normal conditions should experience no problems with entrained moisture or condensation. The Axijet system should not be operated with these connections open to the atmosphere.
PAGE 7
Belt and Pulley Installation Belt tension is determined by the sound the belts make when the fan is first started. Belts will produce a loud squeal, which dissipates after the fan is operating at full capacity. If the belt tension is too tight or too loose, lost efficiency and possible damage can occur. Do not change the pulley pitch diameter to change tension. This will result in a different fan speed than desired. 1. 2. 3. 4.
PAGE 8
Wiring Installation All wiring should be in accordance with local ordinances and the National Electrical Code, NFPA 70. Ensure the power supply (voltage, frequency, and current carrying capacity of wires) is in accordance with the motor nameplate. Shut off all power sources before unit is wired to power source. Leave enough slack in the wiring to allow for motor movement when adjusting belt tension.
PAGE 9
Typical Damper Motor Schematic For 3 phase, damper motor voltage should be the same between L1 and L2. For single phase application, disregard L3. *Damper motors may be available in 115, 230 and 460 volt models. The damper motor nameplate voltage should be verified prior to connection. **A transformer may be provided in some installations to correct the damper motor voltage to the specified voltage. Final Installation Steps 1.
PAGE 10
Start Up Turn the fan on. In variable speed units, set the fan to its lowest speed and inspect for the following: 1. Direction of rotation. 2. Excessive vibration. 3. Unusual noise. 4. Bearing noise. 5. Improper belt alignment or tension (listen for squealing). 6. Improper motor amperage or voltage. If a problem is discovered, immediately shut the fan off. Shut off all electrical power and check for the cause of the trouble. See Troubleshooting.
PAGE 11
Speed Increase Close the pulley in order that the belt rides higher in the groove (larger pitch diameter). Ensure that the RPM limits of the fan and the amperage limits of the motor are maintained. These can be read on the motor name plate. Pulley & Belt Replacement 1. 2. 3. 4. 5. 6. Remove pulleys from their respective shafts. Clean motor and fan shafts. Clean bores of pulleys and coat the bores with heavy oil. Remove grease, rust, or burns from pulleys and shafts. Remove burrs from the shaft by sanding.
PAGE 12
Bearing Replacement The fan bearings are pillow block ball bearings (Axijet 1225 & 1500 models have flange bearing assemblies). An emery cloth or file may be needed to remove imperfections in the shaft left by the setscrews. NOTE: In applications where contact with the contaminated exhaust surface poses a health hazard, the bearings can be removed with the wheel and inlet cone staying in place.
PAGE 13
Flange Bearing Replacement (Axijet-F 1225 & 1500 only) Please refer to Fig. 15 for the following procedures. The fan bearings are housed inside the flange bearing assembly, which includes the shaft. It is easier and quicker to replace the entire assembly, rather than the bearings themselves. 1. 2. 3. 4. 5. 6. 7. 8. 9. Remove the fan drive belt and pulley. Remove by unscrewing the front protective cap, and then the nut, washers and threaded stud.
PAGE 14
Parts List Fig. 14 – Steel Axijet Fans (FRP Axijets 1825 to 4900, similar parts) Fig.