MK Plastics Inline Fan IO&M User Manual

Bulletin 90- 01- NOV2002

FRP Centrifugal & Inline Fans

This publication contains the installation, operation and maintenance instructions for the following corrosion resistant
FRP fans:

INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

• CNW

• PRVS

• DHK

• AXCL

• PVK

M.K. Plastics catalogs on the above corrosion resistant FRP fans, 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 Industrial and
Commercial Fans.

For Information on special fan application requirements, contact M.K. Plastic’s Corporate office at [phone].

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.

• Record on the Delivery Receipt any visible sign of damage.

Handling

Lift the fan by the base or lifting lugs. Never lift by the shaft, motor or housing. See Fig. 1 – Fan Lifting Lug Details.

WARNING
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.

Fig. 1 – Fan Lifting Lug Details

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Storage

If the fan is stored for any length of time prior to installation, completely coat the bearings with grease or moisture inhibiting oil
(refer to Lubricants on page 8). Rotate the wheel several revolutions every three to five days to keep a coating of grease on all
internal bearing parts.

Outdoor Storage

To maintain good working condition of the fan when it is stored outdoors, follow the additional instructions below.

1. Cover the inlet and outlet to prevent the accumulation of dirt and moisture in the housing.

2. Periodically rotate the wheel and operate dampers (if supplied).

3. Periodically inspect the unit to prevent damaging conditions.

Personal Safety
Disconnect switches are recommended. Place the disconnect
switch near the fan in order that the power can be swiftly cut
off in case of an emergency, and in order that maintenance
personnel are provided complete control of the power source.

Vibration Isolators

To prevent vibration and noise from being transferred to the building, vibration isolators are recommended. Isolators should be
located between the fan system and the support structure. M.K. Plastics supplies three main types of isolators for FRP fans:

• Floor Mounted Spring Isolators

• Floor Mounted Rubber-In-Shear Isolators

• Hanging Spring Isolators (in-line fans)

In applications where seismic isolators are required, contact M.K. Plastics directly for further details.

Fig. 2 – Floor Mounted Vibration Isolators – (Typical)

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Floor Mounted Rubber-In-Shear Isolators

1. Mount fan on rail supports (if supplied).

2. Elevate fan to provide room to insert isolators between the fan base and supports and block in position.

3. Position isolators under fan and secure bolts.

4. Remove blocks and allow fan to rest on the isolators. Isolators must be installed on a level surface (leveling should not
be required).

5. Secure isolators to mounting surface.

Floor Mounted Spring Vibration Isolators (Refer to Fig. 3)

Fig. 3 – Spring Vibration Isolators (Assembly Detail - Typical)

1. Locate the isolators in their proper position under the fan. The equipment support should be flat and level. Shims, if
required, should be full size.

2. Before the isolators are adjusted, the weight of the fan will cause the top plate to come to rest on the housing. The
isolators should be adjusted to provide a minimum clearance of ¼” between the top plate and the housing.

3. Install the adjusting and leveling bolts through the equipment mounting holes until the bolt comes into contact with the
spring cup. Back off the lock nut and compress the springs by turning the adjusting bolt clockwise. Start at one isolator
and make four turns on the adjusting bolt, move to the next isolator and make four turns, etc., until all isolators have
been adjusted four turns. Repeat this procedure until a ¼” clearance is obtained between top plate and housing.

4. Check the level of the fan. The fan may now be leveled by making small adjustments of individual isolators at the high
and low points. The sleeves of the fan and isolation damper should be in line.

5. After the fan is level, visually check each isolator to make sure spring coils are not closed solid and there is sufficient
clearance between the top plate and housing.

Spring Hanging Vibration Isolators (Refer to Fig. 4)

Fig. 4 – Spring Hanging Vibration Isolators (In-line fans - Typical)

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1. Install the spring hanger as shown in Fig. 4.

2. Only after the fan is in it’s final operating weight should the spring be adjusted. To adjust the spring, turn the nut directly
above the spring cup clockwise. This will compress the spring.

3. When supporting the fan, not more than (3) complete turns should be made on the adjusting nut for each hanger at one
time. Begin at one support point and progress around the fan compressing each spring in turn. This will tend to
compress all springs uniformly and eliminate overloading of individual hangers.

4. Should any point be overloaded, turn the nut counterclockwise. This will unload the spring.

5. Check the level of the fan. The fan may now be leveled by making small adjustments of the individual isolators.

6. After the fan is level, visually check each isolator to make sure the spring coils are not closed solid.

Duct Installation

Efficient fan performance relies on the proper installation of inlet ducts (where factory inlet plenums are not provided). For duct
inlets, allow at least 3 fan wheel diameters between duct turns or elbows and the fan inlet. See Fig. 5 below.

Fig. 5 – Inlet Duct Turns

Wheel-to-Inlet Clearance/Overlap

The correct wheel-to-inlet clearance/overlap is critical to proper fan performance. This clearance should be verified before initial
start-up since rough handling during shipment could cause a shift in fan components. Refer to Fig. 6 - Wheel/Inlet Overlap for
details.

Fig. 6 – Wheel/Inlet Clearance/Overlap

DHK AXCL DIM A (in)

1225 1225 9/16”
1500 1500 5/8”
1825 1825 3/4"
2225 2225 15/16”
2450 2450 1-1/32”
2700 2700 1-1/16”
3000 3000 1-5/16”
3300 3300 1-11/32”
3650 3650 1-1/2”
4025 4025 1-5/8”
4450 4450 1-13/16”
4900 4900 2”
5425 2-1/8”

600 2-3/8”
6600 2-1/2”
7300 2-3/4”

PVK DIM A (in)

500 1”
670 1-1/4”

CNW DIM B(in)

160-200 1/8”
250-400 3/16”

PRVS DIM B (in)

63-250 1/8”

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