4. Start-up
CAUTION! Do not start the blower motor more than 10 times in one hour.
If multiple and frequent start-ups are required by your application, install a
minimum run timer in the motor control circuit to avoid decreased motor
life and possible fire due to over-starting of the motor.
1.1 Start-up Procedure
1. Before operation, confirm the correct direction of rotation by jogging (switching
rapidly on and off) the motor and observing the motor fan rotation in the same
direction as the arrow. If the direction of rotation is incorrect, lock out the power
and switch two leads (three phase) or rewire (single phase) to effect the opposite
rotation direction. Recheck the direction of rotation before proceeding.
2. Do not operate the blower at pressure or vacuum ranges that exceed those
shown in Tables one through four for the model being installed. This can be
achieved by use of the recommended relief valve shown in Table 5.
Note: Relief valves that have been factory pre-set have a label indicating the set
pressure and an arrow indicating the direction of flow. The arrow will point into
the pipe when installed in vacuum applications and out of the pipe when installed
in pressure applications. Do not re-set the relief valve if it has been pre-set from
the factory.
In the event the relief valve setting needs to be reset, adjust the set screw to
increase or decrease the tension on the spring. Place the blower in operation
and note the current draw of the motor. When the current draw of the motor is
near the maximum noted on the motor nameplate, tighten the locking nut on the
valve and proceed.
3. When checking the current draw of the motor with an ammeter, be sure to
confirm the voltage at the motor junction box. Low voltage conditions may result
in difficulty starting or in unexpected motor failure or motor starter trips.
1.2 Potential Risks For Operators
Noise emission: Free field noise limits are indicated in Tables 1-4 (pages 10-14).
Hearing protection is not normally required at the expected noise generation
levels in the table; however, local conditions may result in higher ambient noise.
If this is the case and local noise exceeds OSHA recommended levels for
expected exposure time (typically 85 dBA for eight hours), hearing protection
should be used.
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