Ametek Direct Drive Regenerative Blower HiE858BB72W

WARNING: Attempting to repair or diagnose a blower may void Rotron’s warranty. It may also be difficult to successfully disassemble and reassemble the unit.

1) Disconnect the power leads. CAUTION: Be sure the power is disconnected before doing any work whatsoever on the unit.

2) Remove or separate piping and/or mufflers and filters from the unit.

3) Remove the cover bolts and then the cover. NOTE: Some units are equipped with seals. It is mandatory that these seals be replaced once the unit has been opened.

4) Remove the impeller bolt and washers and then remove the impeller. NOTE: Never pry on the edges of the impeller. Use a puller as necessary.

5) Carefully note the number and location of the shims. Remove and set them aside. NOTE: If the disassembly was for inspection and cleaning the unit may now be reassembled by reversing the above steps. If motor servicing or replacement and/or impeller replacement is required the same shims may not be used. It will be necessary to re-shim the impeller according to the procedure explained under assembly.

6) Remove the housing bolts and remove the motor assembly (arbor/.housing on remote drive models).

7) Arbor disassembly (Applicable on remote drive models only):

WARNING: This unit may be difficult to shim. Extreme care may be exercised.

Tools Needed: Machinist’s Parallel Bar, Vernier Caliper with depth measuring capability, Feeler gauges or depth gauge

Distance from the flange face to the housing (A)

Distance from the flange face to the motor shaft shoulder (B)

Measurements (A) and (B) are made by laying the parallel bar across the housing flange face and measuring to the proper points. Each measurement should be made at three points, and the average of the readings should be used.

After the impeller installation (step #4 below) the impeller/cover clearance can be checked with feeler gauges, laying the parallel bar across the housing flange face. This clearance should nominally be (A-C)/2.

Place the impeller onto the shaft making sure the shaft key is in place and fasten with the bolt, washer and spacer as applicable. Torque the impeller bolt per the table on page 5. Once fastened carefully rotate the impeller to be sure it turns freely.

Remove the manifold cover bolts and them manifold cover

Remove and replace the muffler material if necessary. On blowers with fiberglass acoustical wrap the tubular retaining screens with the fiberglass matting before sliding the muffler pads over the screens

Reassemble by reversing the procedure

Sign off on the muffler material replacement

Place the assembled motor against the rear of the housing and fasten with the bolts and washer

Re-shim the impeller according to the Impeller Shimming Procedure

Replace the seal with a new one

Place the impeller onto the shaft making sure the shaft key is in place and fasten with the bolt, washer and spacer as applicable

Torque the impeller bolt per the table on page 5

Rotate the impeller to be sure it turns freely

Replace the cover and fasten with bolts