MK Plastics RKW IO&M User Manual

Bulletin 60-March 19

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2009

FRP Centrifugal Dome

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INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

RKW FRP FANS

The M.K. Plastics catalog on the above corrosion resistant FRP fan, prov ides 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 an d 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.

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 – The RKW Fan

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Storage

If the fan is stored for any length of time prior to installation, completely coat the bearings, (if the fan has pill ow-block 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 belo w.

1. Cover the 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 pow er can be swiftly cut
off in case of an emergency, and in order that maintenance
personnel are provided complete control of the power source.

Fan Installation

Roof Mounted Fans

Roof mounted fans should normally be attached to equipment sup port cur bs to keep them above th e roof line b y at least 12”. To
install the roof curb, the fan must be disassembled to be able to attach the fan to the curb. See Fig. 2 for details.

Fig. 2 – Roof Curb Mounted

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Roof Curb Attachment

Please refer to Fig. 2. To attach an assembled fan onto a roof curb, do the following –

1. Remove the weather cover; it is attached to the motor plate with self-tapping screws.

2. Unbolt and remove the motor plate, complete with the motor/flange-bearing and wheel assembly.

3. If a shutter or damper is to be installed, then insert inside the roof curb, or attach to the underside of the fan base,
depending on the type used.

4. Position the fan base section on top of the roof curb. Rotate the base so that the roof drain is on the outside of the curb
for water run-off.

5. Fasten the fan base section to the roof curb with counter sunk, self-tapping screws at center distances as shown on the
submittal ‘Technical Data’ sheets. Lag screws may also be used, as long as the bolt head is flush with the top of the
curb.

6. Reassembly of the fan parts are the reversal of disassembly.

Wall Attachment

The fan is attached in a similar way to roof mounting, except that the curb is replaced by spacer blocks or frame, (not supplied).
See Fig. 3 for details.

Fig. 3 – Wall Mounted

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. 4 ­Wheel/Inlet clearance for details – the gap should be 1/8”
on all sizes of RKW fans.

Fig. 4 – Wheel/Inlet Clearance

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