Labconco Coated Steel, Fiberglass and PVC Blowers 7183200 - Manual (Page 19)

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Product Service 1-800-522-7658, International 816-333-8811
Chapter 3: Getting Started
CAUTION: This blower contains
an electrical motor, which requires
proper electrical connection per
the National Electrical Code
(NEC) Section 430 to prevent
hazards. This NEC code and local
codes may require that a circuit
disconnect, overload protection,
and short circuit protection be
included in the installation. Please
consult the code or have the unit
connected by a licensed electrician.
Install the Belt, Adjust the Fan
Speed and Confirm the
Performance of your
Blower/Hood System
Labconco Exhaust Blowers leave the factory adjusted to their top
speed with the belt uninstalled. Frequently, they need to be
readjusted in the field to allow the hood to operate at the proper
face velocity, and to bring the motor current into its proper range.
In order to adjust the blower to the proper speed and install the
belt, refer to the diagrams in Appendix A Replacement Parts, and
follow the procedure below.
1. Ensure the blower is turned off at the roof disconnect.
2. Remove the top weather cover over the motor/drive
compartment.
3. Raise the gravity belt tightener, and remove the belt, tie
wraps, and cardboard under the motor. If no adjustment is
required then proceed to step 7.
4. Loosen the setscrew, with a standard hex key, on the outer
half of the adjustable sheave located on the motor shaft.
5. While holding the back half of the adjustable sheave, turn
the front half of the sheave counter-clockwise to widen the
space between the two halves of the sheave. This creates a
smaller sheave diameter, which lowers the fan speed.
There are a maximum of four turns of adjustment. Do not
allow the belt to ride down on the threaded mandrels of the
sheave.
!